JP7054375B2 - Manufacturing method of bonded body - Google Patents

Description

The present invention relates to a method for producing a bonded body.

Patent Document 1 is a rotary friction joining method in which one member is rotated about a rotation axis and pressed against the other member in parallel with the rotation axis to join the other member. A frictional joining method is disclosed in which a circular protrusion is formed so as to project coaxially with a rotation axis toward a member of the above, and a circular hole into which the circular protrusion is inserted is formed in the other member. In this frictional joining method, the flat end face of one member and the flat plate surface of the disk portion of the other member are frictionally joined.

Japanese Unexamined Patent Publication No. 2008-12573

Generally, when a member having a hollow portion is friction-welded to another member, burrs generated by friction welding are discharged radially outward with respect to the rotation axis, not inside the hollow portion, from the viewpoint of ease of removal. It is desirable to control as such.

On the other hand, in the frictional joining method described in Patent Document 1, flat surfaces are brought into contact with each other to generate frictional heat for frictional joining. In such a friction joining method, a region located relatively radially outside the rotation axis on the flat surface may generate heat first due to the influence of the processing accuracy of the flat surface and the difference in peripheral speed. In such a case, the material in the radial outer region that generates heat and melts first tends to flow in the radial direction, so that the material in the radial inner side that generates heat and melts later tends to flow outward in the radial direction. It becomes difficult to flow.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a bonded body capable of controlling burrs generated by friction welding.

In the present invention, a first member having a hollow portion formed on an end face and a second member having a protruding portion fitted to the hollow portion and a flange portion provided radially outward from the protruding portion are joined. This is a manufacturing method for manufacturing a joined body, in which the first member and the second member are relatively rotated around a rotation axis, and the end face of the first member and the flange portion of the second member are brought into contact with each other to form an end face. The first member and the second member are rotated in a state where the relative rotation speed between the first joining step of generating frictional heat between the flange portion and the first member and the second member is lower than that of the first joining step. It includes a second joining step of joining the end face of the first member and the flange portion of the second member by moving them relative to each other along the axis, and in the first step, the contact portion in the flange portion. And the end face of the first member are brought into contact with each other, and the facing clearance is provided between the relief portion provided on the outer side of the flange portion in the radial direction and separated from the end face of the first member and the end face of the first member. In the second joining step, the facing clearance is filled with a fluid material that plastically flows from between the end face of the first member and the abutting portion of the flange portion of the second member to fill the relief portion and the first member. It is characterized by joining with an end face.

In the present invention, the contact portion of the flange portion is provided inside the relief portion forming the facing clearance with respect to the end surface of the first member in the radial direction. Therefore, the material melted between the end face of the first member and the contact portion of the flange portion of the second member is radially toward the facing clearance between the end face of the first member and the relief portion of the second member. It becomes easier to flow to the outside.

Further, in the present invention, the flange portion has a flange inclined surface that is continuous with the outer peripheral surface of the protruding portion and is inclined with respect to the rotation axis to provide a contact portion, and the end surface of the first member is inclined to the flange. It is characterized in that it is formed in a shape corresponding to the surface and is provided with an inclined end surface that abuts on the contact portion.

In the present invention, the flange portion is continuous with the protruding portion by the flange inclined surface inclined with respect to the rotation axis, and the contact portion is provided on the flange inclined surface. As a result, since a right-angled corner portion is not formed between the flange portion and the protruding portion, it is easy to control the flowing material and the quality of the bonded body can be improved.

Further, in the present invention, the flange portion is provided with a contact portion and has a vertical flange surface formed perpendicular to the rotation axis, and the end surface of the first member is formed perpendicular to the rotation axis and has a contact portion. A vertical end face is provided to contact the It is characterized by being formed.

In the present invention, since the first member and the second member abut on the flange vertical surface perpendicular to the rotation axis and the vertical end surface, the relative movement amount between the first member and the second member along the rotation axis is controlled. It is easy and the quality of the joint can be improved.

According to the present invention, it is possible to control burrs generated by friction welding in the production of a bonded body.

It is a partial cross-sectional view which shows the structure of a hydraulic cylinder. It is sectional drawing for demonstrating the manufacturing method of the cylinder tube which concerns on embodiment of this invention, and is the figure which shows the state before joining. It is sectional drawing for demonstrating the manufacturing method of the cylinder tube which concerns on embodiment of this invention, and is the figure which shows the state which the 1st member and 2nd member were in contact with each other in the 1st joining process. FIG. 3 is an enlarged view of part A in FIG. It is sectional drawing for demonstrating the manufacturing method of the cylinder tube which concerns on embodiment of this invention, and is the figure which shows the 1st joining process. It is sectional drawing for demonstrating the manufacturing method of the cylinder tube which concerns on embodiment of this invention, and is the figure which shows the 2nd joining process. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 for explaining a first modification of the method for manufacturing a cylinder tube according to an embodiment of the present invention, and is a diagram showing a state in which the first member and the second member are in contact with each other. be. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 for explaining a second modification of the method for manufacturing a cylinder tube according to an embodiment of the present invention, and is a diagram showing a state in which the first member and the second member are in contact with each other. be. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 for explaining a third modification of the method for manufacturing a cylinder tube according to an embodiment of the present invention, and is a diagram showing a state in which the first member and the second member are in contact with each other. be. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 for explaining a fourth modification of the method for manufacturing a cylinder tube according to an embodiment of the present invention, and is a diagram showing a state in which a first member and a second member are in contact with each other. be. FIG. 5 is an enlarged cross-sectional view corresponding to FIG. 4 for explaining a fifth modification of the method for manufacturing a cylinder tube according to an embodiment of the present invention, and is a diagram showing a state in which the first member and the second member are in contact with each other. be. It is sectional drawing in order to explain the manufacturing method of the piston rod which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Hereinafter, a case where the joint body is a cylinder tube 100 of a hydraulic cylinder (fluid pressure cylinder) 1 will be described.

First, with reference to FIG. 1, the overall configuration of the hydraulic cylinder 1 including the cylinder tube 100 as a joint body will be described.

The hydraulic cylinder 1 is an actuator that expands and contracts by the hydraulic pressure of the hydraulic oil (working fluid) in the rod side chamber 3 and the anti-rod side chamber 4, which are two cylinder chambers.

As shown in FIG. 1, the hydraulic cylinder 1 is provided on a cylindrical cylinder tube 100, a piston rod 101 inserted into the cylinder tube 100, and an inner peripheral surface of the cylinder tube 100 provided at the end of the piston rod 101. A piston 2 that slides along the shaft is provided.

The cylinder tube 100 is provided with a cylindrical cylinder head 5 that seals an opening at one end (tip) and slidably supports the piston rod 101. The cylinder head 5 is fastened to the cylinder tube 100 via a plurality of fastening bolts (not shown) arranged in the circumferential direction.

As shown in FIG. 1, mounting portions (clevis) 100A and 101A for mounting the hydraulic cylinder 1 to other equipment are provided at the base end portion of the cylinder tube 100 and the tip end portion of the piston rod 101, respectively. The piston 2 is attached to the base end of the piston rod 101 by screwing.

The inside of the cylinder tube 100 is partitioned by a piston 2 into a rod side chamber 3 and an anti-rod side chamber 4. The rod side chamber 3 and the anti-rod side chamber 4 are filled with hydraulic oil as a working fluid.

In the hydraulic cylinder 1, the piston rod 101 moves in the extension direction when hydraulic oil is supplied to the anti-rod side chamber 4 and discharged from the rod side chamber 3 through a port (not shown) provided in the cylinder tube 100. Further, in the hydraulic cylinder 1, the piston rod 101 moves in the contraction direction when the hydraulic oil is supplied to the rod side chamber 3 and discharged from the anti-rod side chamber 4. When the hydraulic oil is supplied and discharged to the cylinder chambers (rod side chamber 3, anti-rod side chamber 4) inside the cylinder tube 100 during expansion and contraction operation, the hydraulic pressure of the hydraulic oil acts on the cylinder tube 100 as internal pressure.

Next, a method for manufacturing the cylinder tube 100 will be described mainly with reference to FIGS. 2 to 6.

As shown in FIG. 2, the cylinder tube 100 is manufactured by joining a tube main body 10 as a first member and a head member 20 as a second member by friction welding. More specifically, the tube body 10 and the head member 20 are brought into contact with each other in a state of being relatively rotated around the rotation axis O, and are joined by the frictional heat generated thereby (a joining step described later).

First, the configurations of the tube main body 10 and the head member 20 before joining will be described with reference to FIGS. 2 to 4. FIG. 2 shows a state in which the central axis of the tube body 10 and the central axis of the head member 20 are arranged coaxially with each other and coincide with the rotation axis O of friction welding described later.

As shown in FIGS. 1 and 2, the tube body 10 is formed in a cylindrical shape having through holes 11 that open in both end faces 15 in the axial direction. The through hole 11 corresponds to a hollow portion formed in the end surface 15 of the tube body 10 to be joined to the head member 20.

As shown in FIG. 2, the head member 20 is joined to one end surface 15 of the tube body 10. The end face 15 (joint surface) to which the head member 20 is joined is provided on the radial inner side of the vertical end face 16 which is a flat surface perpendicular to the rotation axis O (central axis of the tube body 10) in friction welding. It has an inclined end face 17 formed so as to be inclined with respect to the rotation axis O. The vertical end surface 16 is an annular plane and is continuously formed on the outer peripheral surface of the tube body 10. The inclined end surface 17 is a tapered surface inclined at 45 ° with respect to the rotation axis O, and is connected to the vertical end surface 16 and the inner peripheral surface of the tube body 10.

The inner peripheral surface of the tube body 10 forming the through hole 11 which is a hollow portion is formed as a cylindrical surface centered on the axis of rotation O, and is connected to the inclined end surface 17 as the inner peripheral surface of the first cylinder (inner peripheral surface of the cylinder). 12, a second inclined inner peripheral surface 13 continuous with the first cylindrical inner peripheral surface 12 and inclined with respect to the rotation axis O, and a second inclined inner peripheral surface 13 formed as a cylindrical surface centered on the rotation axis O and continuous with the inclined inner peripheral surface 13. It has a cylindrical inner peripheral surface 14. The inner peripheral surface 14 of the second cylinder is a sliding surface on which the piston 2 slides.

The inclined inner peripheral surface 13 is a tapered surface (conical surface) formed so as to be inclined with respect to the rotation axis O. The inner diameter of the inclined inner peripheral surface 13 decreases as the distance from the end surface 15 which is the joint surface is along the axial direction.

The head member 20 has a protruding portion 21 formed so as to fit into the through hole 11 of the tube main body 10, and a flange portion 25 provided radially outward from the protruding portion 21.

The flange portion 25 is provided with a mounting portion 100A on the side opposite to the protruding portion 21 in the axial direction. The outer diameter of the flange portion 25 is formed to be the same as the outer diameter of the tube body 10.

The end surface 26 of the flange portion 25 joined to the tube body 10 has a flange vertical surface 27 which is an annular flat bearing surface perpendicular to the rotation axis O, and a flange inclined surface 28 inclined to the rotation axis O. The flange vertical surface 27 is continuous with the outer peripheral surface of the flange portion 25 and the flange inclined surface 28.

The flange inclined surface 28 is a tapered surface (conical surface) formed so as to be inclined at 45 ° with respect to the central axis. The outer diameter of the flange inclined surface 28 becomes smaller as it is separated from the flange vertical surface 27 toward the tube main body 10 along the rotation axis O. In this way, the inclined inner peripheral surface 13 of the tube body 10 and the flange inclined surface 28 of the flange portion 25 are formed in a shape corresponding to each other, specifically, a tapered surface shape inclined by 45 ° with respect to the rotation axis O. Will be done.

The protruding portion 21 is provided coaxially with the flange portion 25. The protruding portion 21 has a cylindrical outer peripheral surface 22 formed as a cylindrical surface continuous with the flange inclined surface 28 of the flange portion 25 and centered on the rotation axis O as an outer peripheral surface, and a cylindrical outer peripheral surface 22 continuous with the rotation axis O. It has an inclined outer peripheral surface 23 that is inclined with respect to the inclined outer peripheral surface 23. The inclined outer peripheral surface 23 is a tapered surface (conical surface) whose outer diameter becomes smaller as it is separated from the flange portion 25 along the rotation axis O. That is, the protruding portion 21 is formed in a columnar shape in which the root portion connected to the flange portion 25 has a cylindrical outer peripheral surface 22 and the tip portion away from the flange portion 25 has an inclined outer peripheral surface 23. To. In the following, in the protruding portion 21, the flange portion 25 side is referred to as the “root” of the protruding portion 21, and the opposite side of the root is referred to as the “tip” of the protruding portion 21.

Next, a method of manufacturing the cylinder tube 100, which is a bonded body, will be described.

The cylinder tube 100 is manufactured by the following manufacturing process. The following step (2) corresponds to the first joining step, and the step (4) corresponds to the second joining step.

(1) First, as shown in FIG. 2, one end surface 15 (joint surface) of the tube body 10 and the end surface 26 (joint surface) of the flange portion 25 of the head member 20 are coaxially arranged so as to face each other. ..

(2) Next, with the head member 20 rotated about the rotation axis O, the tube body 10 and the head member 20 are relatively moved along the rotation axis O in a direction close to each other. In this embodiment, the tube body 10 is moved toward the head member 20. As a result, as shown in FIGS. 3 and 4, the protruding portion 21 of the head member 20 is fitted into the through hole 11 of the tube body 10 with a predetermined clearance (hereinafter referred to as “fitting clearance FC”). The end surface 15 of the tube body 10 and the end surface 26 of the flange portion 25 of the head member 20 are in contact with each other (hereinafter, referred to as “contact state”).

Here, the contact state will be described in detail with reference to FIG.

When the tube body 10 and the head member 20 are brought into close contact with each other along the rotation axis O, the inclined end surface 17 of the tube body 10 and the flange inclined surface 28 of the flange portion 25 of the head member 20 are in contact with each other. , The vertical end surface 16 of the tube body 10 and the flange vertical surface 27 of the flange portion 25 are separated from each other in the axial direction without contacting each other. Therefore, a predetermined clearance (hereinafter referred to as “opposite clearance OC”) is formed between the vertical end surface 16 of the tube body 10 and the flange vertical surface 27 of the flange portion 25.

Further, in the contact state, a part of the end surface 26 (flange inclined surface 28) of the flange portion 25 facing the fitting clearance FC does not abut on the tube main body 10.

As described above, the end surface 26 of the flange portion 25 is in contact with a part of the flange inclined surface 28 (hereinafter, referred to as “contact portion 26a”) that abuts on the end surface 15 of the tube body 10 in the contact state. A portion radially inside the portion 26a and not in contact with the end surface 15 of the tube body 10 (hereinafter referred to as “non-contact portion 26b”) and a portion radially outside the contact portion 26a. It is divided into a portion that does not come into contact with the end surface 15 of the tube body 10 (hereinafter, referred to as a “relief portion 26c”).

The non-contact portion 26b is a portion of the end surface 26 of the flange portion 25 facing the fitting clearance FC, and a part of the radially inner side of the flange inclined surface 28 corresponds to the non-contact portion 26b. That is, the non-contact portion 26b is a portion that connects the contact portion 26a and the protruding portion 21.

The relief portion 26c is a portion of the end surface 26 of the flange portion 25 facing the facing clearance OC, and a part of the flange inclined surface 28 on the radial outer side and the flange vertical surface 27 correspond to the relief portion 26c.

In the abutting state, the protruding portion 21 of the head member 20 has a cylindrical outer peripheral surface 22 facing the first cylindrical inner peripheral surface 12 of the tube body 10, and an inclined outer peripheral surface 23 with the first cylindrical inner peripheral surface 12 and an inclined inner peripheral surface. It is fitted into the through hole 11 of the tube body 10 so as to face the surface 13. In the contact state, the fitting clearance FC increases from the root side to the tip side of the protrusion 21. Specifically, the fitting clearance FC is a radial clearance between the inner peripheral surface 12 of the first cylinder of the tube body 10 and the outer peripheral surface 22 of the cylinder of the protruding portion 21 (hereinafter, referred to as “first clearance FC1”). ), The radial clearance between the inner peripheral surface 12 of the first cylinder and the outer peripheral inclined surface (hereinafter referred to as “second clearance FC2”), and the inclined inner peripheral surface 13 and the inclined outer peripheral surface 23. The clearance between them (hereinafter referred to as "third clearance FC3") and the like are included. The first clearance FC1 has a constant size along the axial direction. The second clearance FC2 increases from the first clearance FC1 from the root side to the tip side. The third clearance FC3 has a constant size along the axial direction. That is, the first clearance FC1 is the minimum clearance in the mating clearance FC. Further, the first clearance FC1 corresponds to the root side clearance, and the third clearance FC3 corresponds to the tip side clearance.

The fact that the fitting clearance FC "increases from the root side to the tip side" means that there is no region where the clearance decreases from the root side to the tip side, and the clearance is along the axial direction. It does not exclude the inclusion of a constant region (eg, first clearance FC1 between the inner peripheral surface 12 of the first cylinder and the outer peripheral surface 22 of the cylinder). That is, when the fitting clearance FC "increases from the root side to the tip side", the fitting clearance FC at a certain axial position is on the root side of the fitting clearance FC at the axial position. It means the same or larger state as compared with FC.

In the above contact state, by pressing the head member 20 rotating about the center of the rotation shaft O and the tube body 10 with a predetermined pressing force, the inclined end surface 17 of the tube body 10 and the flange inclined surface 28 of the head member 20 are pressed. Friction heat is generated between the contact portion 26a and the contact portion 26a. The frictional heat softens the inclined end face 17 and the contact portion 26a. The heat transfer from the softened contact portion 26a also heats the non-contact portion 26b and the relief portion 26c that do not come into contact with the end surface 15. Further, as shown in FIG. 5, a part of the material of the contact portion 26a of the softened flange portion 25 and the inclined end surface 17 of the tube body 10 flows to the fitting clearance FC and the facing clearance OC. Therefore, the non-contact portion 26b of the flange portion 25 that comes into contact with the material flowing through the fitting clearance FC, the cylindrical outer peripheral surface 22 of the protruding portion 21, and the first cylindrical inner peripheral surface 12 of the tube body 10 are also heated. Further, the relief portion 26c of the flange portion 25 in contact with the material flowing in the facing clearance OC and the vertical end surface 16 of the tube body 10 are also heated.

(3) The rotation of the head member 20 is stopped when the non-contact portion 26b of the flange portion 25 is heated until it is sufficiently softened. Specifically, the amount of movement or pressing time of the tube body 10 due to pressing until the non-contact portion 26b softens is determined in advance by an experiment or the like, and when the amount of movement or pressing time is reached, the head member 20 Control rotation.

(4) When the rotation of the head member 20 is stopped, the tube body 10 is pressed against the head member 20 with a larger pressing force so as to move the tube body 10 toward the tube body 10 by a predetermined amount. As a result, the heated high-temperature portion plastically flows to the outer peripheral side and the inner peripheral side. The fluid material plastically flowed to the inner peripheral side is guided to the fitting clearance FC between the inner peripheral surface of the tube body 10 and the outer peripheral surface of the protruding portion 21, and fills the fitting clearance FC from the root side of the protruding portion 21. do.

Here, the two-dot chain line in FIG. 5 indicates the head member 20 when the relative rotation between the tube main body 10 and the head member 20 is stopped and the two are brought close to each other. As described above, the inclined inner peripheral surface 13 has a shape in which the inner diameter becomes smaller toward the end surface 15 of the tube main body 10. Therefore, when the head member 20 is moved toward the tube body 10 along the rotation axis O, the third clearance FC3 between the inclined inner peripheral surface 13 and the outer peripheral inclined surface moves as shown in FIG. It becomes smaller with. Specifically, the size of the third clearance FC3 decreases from the gap amount t1 to the gap amount t2.

In the step (4) above, the material that plastically flows to the inner peripheral side is filled with the fitting clearance FC (third clearance FC3) up to the range of the inclined inner peripheral surface 13 in the axial direction. In other words, as shown in FIG. 6, the tip portion T of the material plastically flowed to the inner peripheral side is provided inside the inclined inner peripheral surface 13 in the radial direction and is located within the axial range of the inclined inner peripheral surface 13. As described above, the amount of movement of the tube body 10 in the axial direction is set.

The fluid material that has plastically flowed to the outer peripheral side is guided to the facing clearance OC and flows outward from the contact portion 26a in the radial direction to fill the facing clearance OC. Further, the material plastically flowed to the outer peripheral side is discharged as a burr B to the outer periphery of the tube body 10 (see FIG. 6).

(5) Finally, by holding the pressed state of (4) above for a predetermined time, mutual diffusion between the end surface 15 of the tube body 10 that has been heated and softened and the end surface 26 of the flange portion 25 of the head member 20 is promoted. , The joining of both is completed (see FIG. 6). In the head member 20, the contact portion 26a with which the end surface 15 of the tube body 10 abuts is softened by frictional heat, and the non-contact portion 26b and the relief portion 26c are also heated and softened. Therefore, as shown in FIG. 6, the head member 20 is joined to the tube main body 10 not only at the contact portion 26a but also at the non-contact portion 26b and the relief portion 26c. The broken line in FIG. 6 indicates the bonding interface between the tube body 10 and the head member 20.

Further, in the above (2), the material softened by the contact portion 26a and the non-contact portion 26b partially forms a fitting clearance FC between the inner peripheral surface of the tube body 10 and the outer peripheral surface of the protruding portion 21. Be guided. A part of the outer peripheral surface of the protruding portion 21 is also heated by the frictional heat generated between the material flowing to the fitting clearance FC and the outer peripheral surface of the protruding portion 21. Therefore, a part of the outer peripheral surface of the protruding portion 21 heated and softened by frictional heat is also joined to the inner peripheral surface of the tube body 10. As described above, in the present embodiment, the flange portion 25 is joined to the tube main body 10 over the entire end surface 26, and the joining interface shown by the broken line in FIG. 6 has a diameter from the root portion of the protruding portion 21 to the outer peripheral surface of the tube main body 10. It is configured to extend outward in the direction.

By the joining process as described above, the tube main body 10 and the head member 20 are joined.

The second joining step of the above (4) is not limited to the configuration in which the relative rotation of the tube body 10 and the head member 20 is stopped and pressed against each other, and the relative rotation speed in the first joining step of the above (2) (2). Specifically, the tube body 10 and the head member 20 may be pressed against each other at a relative rotation speed lower than the rotation speed of the head member 20). From another point of view, the friction welding of the method for manufacturing a joined body in the present embodiment may be a so-called brake type or a flywheel type. In the scope of the patent claim, "a state in which the relative rotation speed between the first member and the second member is lower than that in the first joining step" means that the relative rotation speed is larger than zero and the relative rotation speed in the first joining step. It means that not only the state where the relative rotation speed is lower than the state where the relative rotation speed is zero (that is, the state where the relative rotation is stopped) is included.

The burr B discharged to the outer peripheral side of the joint surface between the tube body 10 and the head member 20 is cut off after the joining is completed, and the outer periphery of the tube body 10 and the head member 20 is processed into a smoothly continuous state. If there is no problem with the presence of the burr B, the burr B may remain on the outer peripheral side of the cylinder tube 100 without cutting the burr B.

When the flowing material flows out from the fitting clearance to the inner space of the cylinder tube, burrs also occur on the inner peripheral side of the cylinder tube. In the process of cooling the fluid material in the mating clearance to become burrs, so-called oxide scale occurs. It is difficult to remove and clean burrs and oxide scales on the inner peripheral side of the cylinder tube. If the hydraulic oil is guided to the inside of the cylinder tube with such burrs on the inner peripheral side, the oxide scale may be mixed with the hydraulic oil, resulting in so-called contamination.

Therefore, in the joining step of the present embodiment, the plastic flow is controlled so as not to flow out to the inner space of the cylinder tube 100 while filling the fitting clearance FC. Specifically, the fluid material is controlled so that the tip portion T of the fluid material projects from the end surface of the projecting portion 21 to the left side in FIG. 6 and does not become a burr. This makes it possible to more effectively prevent the occurrence of contamination in the hydraulic oil. In other words, in the manufacturing method according to the present embodiment, by controlling the plastic flow to the fitting clearance FC, it is possible to suppress burrs generated on the inner peripheral side of the cylinder tube 100.

Further, after the completion of the joining process, a quality inspection is performed on the friction welding portion between the tube body 10 and the head member 20 by a non-destructive test such as ultrasonic flaw detection. By such a quality inspection, it is possible to detect a defect in joining at the friction welding portion.

Next, the operation of the method for manufacturing a bonded body according to the present embodiment will be described.

In the present embodiment, the tube body 10 has an inclined inner peripheral surface 13 whose inner diameter decreases toward the end surface 15 of the tube body 10, and the tip portion T of the fluidized material filled in the fitting clearance FC is inside the inclined surface. It is located within the axial range of the peripheral surface 13. In the above step (5), when the head member 20 is moved toward the tube body 10 along the rotation axis O, the third clearance FC3 between the inclined inner peripheral surface 13 and the outer peripheral inclined surface becomes smaller as it moves. (See Fig. 5). That is, the third clearance FC3 (solid line in FIG. 5, gap amount t1) in the contact state is relatively large, and the third clearance FC3 (two-dot chain line in FIG. 5, gap amount t2) at the completion of joining is relatively large. small. Therefore, the third clearance FC3 can be set relatively large in the contact state, and unintended contact of the inclined outer peripheral surface 23 with the inclined inner peripheral surface 13 can be suppressed. Further, since the third clearance FC3 is set to be relatively small when the joining is completed, the surface area where the fluid material (burr) filled in the third clearance FC3 comes into contact with air becomes smaller, so that the tube body 10 (cylinder) is affected by the burrs. It is possible to suppress the generation of oxidation scale generated inside the tube 100). As described above, since the third clearance FC3 is relatively large in the contact state and the third clearance FC3 is small when the joining is completed, it is possible to suppress the joining failure and the generation of the oxidation scale at the same time.

Further, in the joining by friction welding, the protruding portion of the head member rotates eccentrically with respect to the rotating shaft due to the processing accuracy of the head member and the misalignment between the head member and the rotating shaft. Runout of the protrusion may occur. When the protrusion occurs, the inner peripheral surface of the through hole of the tube body and the protrusion of the head member may unintentionally come into local contact with each other. When such local contact occurs, the base material at the contact point may melt, resulting in poor joining where the tube body and the head member are joined at an unintended place.

On the other hand, in the present embodiment, the fitting clearance FC is configured so that the first clearance FC1 on the most root side is the smallest. Therefore, even if the protruding portion 21 rotates around the rotating shaft O in a state of being eccentric with respect to the rotating shaft O and the protruding portion 21 swings, the cylindrical outer peripheral surface 22 on the root side is attached to the tube body 10. Since they come into contact with each other, the inclined outer peripheral surface 23 on the tip end side of the protrusion 21 is prevented from coming into contact with the tube body 10. As a result, it is possible to prevent the tip end side of the protruding portion 21 from unintentionally contacting the tube body 10 and causing burrs in the through hole 11. Further, when the outer peripheral surface 22 of the cylinder comes into contact with the tube main body 10, further runout of the protruding portion 21 is prevented. That is, the minimum fitting clearance FC (first clearance FC1) is formed between the inner peripheral surface 12 of the first cylinder of the tube body 10 and the outer peripheral surface 22 of the cylinder of the protruding portion 21 on the root side of the protruding portion 21. The runout of the protrusion 21 is suppressed to the size of the first clearance FC1. Therefore, poor joining can be further suppressed.

Further, in the present embodiment, the end surface 15 of the tube body 10 and the end surface 26 of the flange portion 25 abut on the inclined end surface 17 on the inner side in the radial direction and the inclined end surface 28 on the flange portion 28, and the vertical end surface 16 on the outer side in the radial direction and the flange are perpendicular to each other. The facing clearance OC is formed without contacting the surface 27. As a result, in the initial stage of friction welding, frictional heat is generated in a region relatively inner in the radial direction, and then frictional heat is generated in a region outside in the radial direction. In this way, since the frictional heat can be controlled to be sequentially generated from the inner side in the radial direction to the outer side in the radial direction, it becomes easy to flow the fluid material toward the outer side in the radial direction. From another point of view, by providing the facing clearance OC on the outer side in the radial direction, the fluid material melted between the inclined end surface 17 of the tube body 10 and the flange inclined surface 28 of the flange portion 25 that initially abut is formed. , It is easy to flow outward in the radial direction toward the facing clearance OC. In this way, burrs generated by friction welding can be controlled, and the joining quality of the joined body can be improved.

Further, in the present embodiment, the end surface 26 of the flange portion 25 is continuous with the cylindrical outer peripheral surface 22 of the outer peripheral surface of the protruding portion 21 by the flange inclined surface 28. Therefore, a right-angled corner portion is not formed at the connecting portion between the flange portion 25 and the protruding portion 21. Since it is difficult to fill the right-angled corners with the flowing material, the flow material from between the inclined end surface 17 of the tube body 10 and the abutting portion 26a of the flange portion 25 is configured so that the right-angled corners are not formed. It is easy to be satisfied with the fitting clearance FC. This facilitates the control of the fluid material and can improve the quality of the bonded body.

Further, according to the present embodiment, in addition to the contact portion 26a that abuts on the tube body 10, the non-contact portion 26b is also joined to the tube body 10 by heating and softening the non-contact portion 26b. As a result, the cylinder tube 100 is formed so that the joint interface between the head member 20 and the tube main body 10 extends from the root portion of the protruding portion 21 of the head member 20 to the flange portion 25 and the outer peripheral surface of the tube main body 10. Therefore, the fitting clearance FC before joining does not remain, and the joining portion between the tube body 10 and the head member 20 has a solid structure. Therefore, it is possible to prevent the fitting clearance FC before joining from being recognized as a defect in the non-destructive test, and it is possible to easily perform a quality inspection by the non-destructive test.

Next, a modification of the present embodiment will be described. The following modifications are also within the scope of the present invention, and the following modifications can be combined with each configuration of the above embodiment, or the following modifications can be combined with each other. Further, the modified example described in the description of the above embodiment can also be arbitrarily combined with other modified examples.

Hereinafter, deformation examples of the inner peripheral surface of the through hole 11 of the tube body 10 and the outer peripheral surface of the protruding portion 21 will be described with reference to FIGS. 7 to 9.

In the above embodiment, the inner peripheral surface of the tube body 10 has a first cylindrical inner peripheral surface 12 continuous with the end surface 15 which is a joint surface, an inclined inner peripheral surface 13 continuous with the first cylindrical surface, and an inclined inner peripheral surface. It has a second cylindrical surface continuous with 13. The outer peripheral surface of the protruding portion 21 has a cylindrical outer peripheral surface 22 continuous with the end surface 26 of the flange portion 25, and an inclined outer peripheral surface 23 continuous with the cylindrical outer peripheral surface 22. On the other hand, the inner peripheral surface of the tube body 10 and the outer peripheral surface of the protruding portion 21 have a smaller fitting clearance FC as the tube body 10 is moved toward the head member 20 in the above step (4). Any configuration can be used as long as it is configured to be. That is, as long as the tube body 10 is moved toward the head member 20 and the fitting clearance FC is configured to be small, the effect of suppressing the bonding failure and the generation of the oxide scale at the same time is exhibited. can do.

Specifically, the tube main body 10 is provided with an inclined inner peripheral surface 13, and the tip portion T is an outer peripheral surface of the inclined inner peripheral surface 13 and the protruding portion 21 due to a fluid material located within the axial range of the inclined inner peripheral surface 13. Any configuration may be used as long as it is joined to and. For example, as shown in FIG. 7, the outer peripheral surface of the protrusion 21 does not have to have the inclined outer peripheral surface 23. In the modified example shown in FIG. 7, the outer peripheral surface of the protruding portion 21 is composed of only the cylindrical outer peripheral surface 22 having a uniform outer diameter. On the contrary, as shown in FIG. 8, the outer peripheral surface of the protrusion 21 does not have to have the cylindrical outer peripheral surface 22. In the modified example shown in FIG. 8, the outer peripheral surface of the protruding portion 21 is composed of only the inclined outer peripheral surface 23 whose outer diameter decreases toward the tip.

Further, as shown in FIG. 9, the inner peripheral surface of the tube body 10 does not have to have the inner peripheral surface 12 of the first cylinder. In the modified example shown in FIG. 9, the inclined inner peripheral surface 13 is continuous with the end surface 15 (inclined end surface 17) which is a joint surface.

Further, as shown in FIG. 9, the fitting clearance FC does not have to increase from the root side to the tip side. In the modified example shown in FIG. 9, on the inner peripheral surface of the tube body 10, the inclined inner peripheral surface 13 is continuous with the end surface 15, and the outer peripheral surface of the protruding portion 21 is composed of only the inclined outer peripheral surface 23. In this modification, the tilt angle of the tilted inner peripheral surface 13 is larger than the tilt angle of the tilted outer peripheral surface 23. Therefore, the fitting clearance FC decreases from the root side to the tip side. Even in this case, the minimum clearance of the fitting clearance FC formed on the tip side has a size that allows the protrusion 21 to run out (the protrusion 21 does not come into contact with the tube body 10 due to the runout). By setting the above, it is possible to suppress unintended contact between the protruding portion 21 and the tube body 10 due to the runout of the protruding portion 21.

Also in the modified examples shown in FIGS. 7 to 9 as described above, as the tube main body 10 is moved toward the head member 20, the fitting clearance FC formed by the inclined inner peripheral surface 13 becomes smaller, and the movement becomes possible. The fitting clearance FC, which has become smaller as a result, is filled with the tip portion T of the fluid material, whereby even in the modified examples shown in FIGS. 7 to 9, the suppression of bonding defects and the generation of oxidation scale are suppressed at the same time. It plays the effect.

Although not shown, the inclined inner peripheral surface 13 and the inclined outer peripheral surface 23 are not limited to tapered surfaces (conical surfaces) inclined with respect to the rotation axis O, and may be curved surfaces, for example.

Further, when the inclined outer peripheral surface 23 is provided on the outer peripheral surface of the protruding portion 21, it is desirable that the inclined inner peripheral surface 13 and the inclined outer peripheral surface 23 are formed in a shape corresponding to each other, but the shape is not corresponding to each other. May be. When the inclined inner peripheral surface 13 and the inclined outer peripheral surface 23 are formed as tapered surfaces as in the modified example shown in FIG. 9, it is desirable that the inclination angles of the inclined inner peripheral surfaces 13 and the inclined outer peripheral surface 23 are the same, but they do not have to be the same. As shown in FIG. 9, the inclined inner peripheral surface 13 may have a relatively large inclination angle, or the inclined outer peripheral surface 23 may have a relatively large inclination angle, although not shown. good.

Next, with reference to FIGS. 10 and 11, a modified example of the end surface 15 (joint surface) of the tube body 10 and the end surface 26 (joint surface) of the flange portion 25 of the head member 20 will be described.

In the above embodiment, the inclined end surface 17 of the tube body 10 and the flange inclined surface 28 of the flange portion 25 are in contact with each other, and a facing clearance OC is formed by the vertical end surface 16 of the tube body 10 and the flange vertical surface 27 of the flange portion 25. To. In other words, the contact portion 26a of the flange portion 25 is provided on the flange inclined surface 28, and the flange vertical surface 27 mainly constitutes the relief portion 26c.

On the other hand, the end surface 15 of the tube body 10 and the end surface 26 of the flange portion 25 are initially configured to abut in a relatively inner region in the radial direction, and then abut in a region relatively outer in the radial direction. As long as it is not limited to the above configuration.

For example, as shown in FIGS. 10 and 11, the end surface 15 of the tube body 10 does not have the inclined end surface 17, and the end surface 26 of the flange portion 25 does not have to have the flange inclined surface 28. That is, the tube body 10 and the head member 20 do not have to be in contact with each other on the inclined surfaces.

In the modified example shown in FIG. 10, the end surface 15 of the tube body 10 is composed of only the vertical end surface 16 which is a flat surface perpendicular to the rotation axis O. The end surface 26 of the flange portion 25 is provided on the radial outer side of the flange vertical surface 27 and is separated from the end surface 15 of the tube body 10 which is continuous with the outer peripheral surface of the protruding portion 21 and is perpendicular to the rotation axis O. Has an outer inclined surface 27a extending in the rotation axis O direction. In the abutting state, the vertical end surface 16 of the tube body 10 and the flange vertical surface 27 of the flange portion 25 are in contact with each other, and the outer inclined surface 27a of the flange portion 25 is opposed to the vertical end surface 16 of the tube body 10 in the facing clearance OC. To form. That is, in the modified example of FIG. 10, the outer inclined surface 27a constitutes the relief portion 26c.

Further, in the modified example shown in FIG. 11, the end surface 15 of the tube body 10 is a vertical end surface 16 that is continuous with the inner peripheral surface of the through hole 11 (the inner peripheral surface 12 of the first cylinder in FIG. 11) and is perpendicular to the rotation axis O. It has an outer inclined end surface 16a provided on the radial outer side of the vertical end surface 16 and extending in the rotation axis O direction so as to be separated from the end surface 26 of the flange portion 25. The end surface 26 of the flange portion 25 is composed of only the flange vertical surface 27 perpendicular to the rotation axis O. In the abutting state, the vertical end surface 16 of the tube body 10 and a part of the radial inner side of the vertical end surface 16 of the flange portion 25 are in contact with each other, and a part of the radial outer side of the vertical end surface 16 of the flange portion 25 is the tube main body. A facing clearance OC is formed with the outer inclined end surface 16a of 10. That is, in the modified example of FIG. 11, a portion of the flange vertical surface 27 on the outer side in the radial direction, which faces the outer inclined end surface 16a of the tube main body 10, constitutes the relief portion 26c.

Also in the modified examples shown in FIGS. 10 and 11, the end surface 15 of the tube body 10 and the end surface 26 of the flange portion 25 initially abut in a region relatively inside in the radial direction, and are relatively radially in contact with each other. The outer area then abuts. Therefore, even in the modified examples shown in FIGS. 10 and 11, the burr B can be controlled to flow outward in the radial direction.

Further, in the modified examples shown in FIGS. 10 and 11, the tube body 10 and the head member 20 abut on each other in a plane perpendicular to the pressing direction (rotation axis O direction). As a result, it is easy to control the relative movement amount of the tube body 10 and the head member 20 along the rotation axis O in friction welding, and the dimensional accuracy of the length of the joined body along the rotation axis O can be improved. ..

In addition, by combining the modification shown in FIG. 10 and the modification shown in FIG. 11, the outer inclined end surface 16a is provided on the end surface 15 of the tube main body 10, and the outer flange inclined surface 28a is provided on the end surface 26 of the flange portion 25. The facing clearance OC may be formed by the outer inclined end surface 16a and the outer flange inclined surface 28a.

Next, a modification other than the above will be described.

In the above embodiment, the joint body is a cylinder tube for joining the tube main body 10 and the head member 20. On the other hand, the joint is not limited to the cylinder tube, and may be, for example, a piston rod 101.

When the joint body is a piston rod 101, as shown in FIG. 12, the piston rod 101 includes a rod main body 30 as a first member, a screw member 40 as a second member, and a rod head 50, respectively. Is manufactured by joining by friction welding.

The rod body 30 is formed with a through hole 30A as a hollow portion that opens in both end faces 15 in the axial direction. Although detailed illustration is omitted, inclined inner peripheral surfaces 13 similar to those in the above embodiment are provided at both ends of the through hole 11. Further, both end faces 31A and 31B of the rod body 30 are configured in the same manner as the end faces 15 of the tube body 10 in the above embodiment, respectively.

The screw member 40 has a protruding portion 41 formed so as to fit into the through hole 30A of the rod main body 30, and a flange portion 42 provided from the protruding portion 41 toward the outside in the radial direction. The flange portion 42 is provided with a boss portion 44 on the side opposite to the protruding portion 41 in the axial direction. A male screw is formed on the outer periphery of the boss portion 44, and the piston 2 is screwed to the boss portion 44. The outer diameter of the flange portion 42 is formed to be the same as the outer diameter of the rod body 30.

The rod head 50 has a protruding portion 51 formed so as to fit into the through hole 30A of the rod main body 30, and a flange portion 52 provided radially outward from the protruding portion 51. The flange portion 52 is provided with a mounting portion 101A on the side opposite to the protruding portion 51 in the axial direction. The outer diameter of the flange portion 52 is formed to be the same as the outer diameter of the rod body 30.

Although detailed illustration is omitted, the protruding portions 41 and 51 of the screw member 40 and the rod head 50 are configured in the same manner as the protruding portions 21 of the head member 20 in the above embodiment. Further, the end faces 43, 53 of the flange portions 42, 52 of the screw member 40 and the rod head 50, respectively, are configured in the same manner as the end faces 26 of the flange portion 25 of the head member 20 in the above embodiment.

Therefore, the piston rod 101 can be manufactured by joining the rod main body 30 and the screw member 40, and the rod main body 30 and the rod head 50 by the same configuration as the method for manufacturing the joined body in the above embodiment. ..

According to the above embodiment, the following effects are obtained.

In the present embodiment, the tube body 10 has an inclined inner peripheral surface 13 whose inner diameter decreases toward the end surface 15 of the tube body 10, and the tip portion T of the fluidized material filled in the fitting clearance FC is inside the inclined surface. It is located within the axial range of the peripheral surface 13. Therefore, as the tube body 10 and the head member 20 are pressed along the rotation axis O, the fitting clearance FC between the outer peripheral surface of the protrusion 21 and the inclined inner peripheral surface 13 becomes smaller. Therefore, even if the fitting clearance FC is made relatively large so that the tube body 10 and the protruding portion 21 of the head member 20 do not unintentionally come into contact with each other in the contact state, the fitting clearance FC becomes relatively small when the joining is completed. The fluid material is filled. As a result, the surface area of the fluid material filled in the fitting clearance FC in contact with air is suppressed, and the generation of oxide scale is suppressed. Therefore, in the method for producing a bonded body according to the present embodiment, it is possible to suppress the generation of oxide scale and the bonding defect.

Further, in the present embodiment, the fitting clearance FC is configured so that the first clearance FC1 on the most root side is the smallest. Therefore, even if the protruding portion 21 rotates around the rotating shaft O in a state of being eccentric with respect to the rotating shaft O and the protruding portion 21 swings, the cylindrical outer peripheral surface 22 on the root side is attached to the tube body 10. Since they come into contact with each other, the protrusion 21 is prevented from further swinging, and the outer peripheral inclined surface on the tip end side of the protrusion 21 is prevented from coming into contact with the tube body 10. Therefore, poor joining can be further suppressed.

Further, in the present embodiment, the end surface 15 of the tube body 10 and the end surface 26 of the flange portion 25 abut on the inclined end surface 17 on the inner side in the radial direction and the inclined end surface 28 on the flange portion 28, and the vertical end surface 16 on the outer side in the radial direction and the flange are perpendicular to each other. The facing clearance OC is formed without contacting the surface 27. As a result, the flowable material melted between the inclined end surface 17 of the tube body 10 and the flange inclined surface 28 of the flange portion 25, which are initially in contact with each other, easily flows outward in the radial direction toward the facing clearance OC. In this way, burrs generated by friction welding can be controlled, and the quality of the bonded body can be improved.

Hereinafter, the configurations, actions, and effects of the embodiments of the present invention will be collectively described.

A first member (tube body 10, rod body 30) having hollow portions (through holes 11, 30A) formed in end faces 15, 31A, 31B, and a protruding portion fitted to the hollow portion (through holes 11, 30A). A second member (head member 20, screw member 40, rod head 50) having flange portions 25, 42, 52 provided radially outward from 21, 41, 51 and protruding portions 21, 41, 51, and A manufacturing method for manufacturing a joined body (cylinder tube 100, piston rod 101) by joining the first member (tube main body 10, rod main body 30) and the second member (head member 20, screw member 40, The rod head 50) is relatively rotated around the rotation axis O, and the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod) are rotated. The first joining step of bringing the flange portions 25, 42, 52 of the head 50) into contact with each other to generate frictional heat between the end faces 15, 31A, 31B and the flange portions 25, 42, 52, and the first member ( The first member (tube body 10, The rod body 30) and the second member (head member 20, screw member 40, rod head 50) are relatively moved along the rotation axis O in a direction close to each other, and the first member (tube body 10, rod body 50) is moved relative to each other. 30) includes a second joining step of joining the end faces 15, 31A, 31B and the flange portions 25, 42, 52 of the second member (head member 20, screw member 40, rod head 50). In the process, the contact portions 26a at the flange portions 25, 42, 52 and the end faces 15, 31A, 31B of the first member are brought into contact with each other, and the flange portions 25, 42, 52 are radially longer than the contact portions 26a. The relief portion 26c provided on the outside and separated from the end faces 15, 31A and 31B of the first member (tube body 10, rod body 30) and the end face 15 of the first member (tube body 10, rod body 30) face each other. A clearance OC is formed, and in the second joining step, the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) The facing clearance OC is filled with a fluid material that plastically flows from between the flange portions 25, 42, and 52 with the abutting portions 26a, and escapes. The girder portion 26c is joined to the end faces 15, 31A and 31B of the first member (tube main body 10, rod main body 30).

In this configuration, the contact portion 26a of the flange portions 25, 42, 52 is from the relief portion 26c forming the facing clearance OC with respect to the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30). Is also provided on the inside in the radial direction. Therefore, the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the flange portions 25, 42, 52 in the second member (head member 20, screw member 40, rod head 50) come into contact with each other. The material melted between the portions 26a easily flows outward in the radial direction toward the facing clearance OC between the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the relief portion 26c. Become. Therefore, in the manufacture of the bonded body, burrs generated by friction welding can be controlled.

Further, in the method for manufacturing a joined body according to the present embodiment, the flange portions 25, 42, 52 are continuous with the outer peripheral surfaces of the protruding portions 21, 41, 51, and are inclined with respect to the rotation axis O, and the contact portions 26a. The end faces 15, 31A and 31B of the first member (tube main body 10, rod main body 30) are formed in a shape corresponding to the flange inclined surface 28 and hit the contact portion 26a. An inclined end face 17 in contact is provided.

In this configuration, the flange portions 25, 42, and 52 are continuous with the protruding portion 21 by the flange inclined surface 28 inclined with respect to the rotation axis O, and the contact portion 26a is provided on the flange inclined surface 28. As a result, right-angled corners are not formed between the flange portions 25, 42, 52 and the protrusions 21, 41, 51, so that the flowable material can be easily controlled and the quality of the bonded body can be improved.

Further, in the method for manufacturing a joined body according to the present embodiment, the flange portions 25, 42, 52 have a contact portion 26a and have a flange vertical surface 27 formed perpendicular to the rotation axis O, and the first one. The end faces 15, 31A, and 31B of the members (tube body 10, rod body 30) are provided with vertical end faces 16 formed perpendicular to the rotation axis O and in contact with the contact portion 26a, and the flange portions 25, 42, 52 are provided with vertical end faces 16. At least one of the relief portion 26c and a part of the end faces 15, 31A, and 31B facing the relief portion 26c is formed so as to be inclined with respect to the rotation axis O so as to be separated from the other and form the facing clearance OC. ..

In this configuration, the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) are a flange vertical surface 27 perpendicular to the rotation axis O and a vertical end surface. In order to abut at 16, the relative movement amount between the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) along the rotation axis O is controlled. It is easy and the quality of the joint can be improved.

The present specification also includes the following inventions.

A first member (tube body 10, rod body 30) having hollow portions (through holes 11, 30A) formed in end faces 15, 31A, 31B, and a protruding portion fitted to the hollow portion (through holes 11, 30A). A second member (head member 20, screw member 40, rod head 50) having flange portions 25, 42, 52 provided radially outward from 21, 41, 51 and protruding portions 21, 41, 51, and Is a manufacturing method for manufacturing a joined body (cylinder tube 100, piston rod 101) by joining the hollow portions (through holes 11, 30A) and the protruding portions 21 with a fitting clearance FC. The first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) are relatively rotated around the rotation axis O, and the first member (tube body 10, rod body 10) is rotated. The end faces 15, 31A, 31B of the rod body 30) and the flange portions 25, 42, 52 of the second member (head member 20, screw member 40, rod head 50) are brought into contact with each other, and the end face 15 and the flange portion 25 are brought into contact with each other. , 42, 52, the first joining step to generate frictional heat, the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50). The rotation shaft O of the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) is in a state where the relative rotation speed of the above is lower than that of the first joining step. The flange portions 25, 42 of the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) are pressed against each other along the above. The first member (tube body 10, rod body 30) is an inner peripheral surface forming (through holes 11, 30A), including a second joining step of joining the 52, and is a rotation shaft from the end surface 15. It has an inclined inner peripheral surface 13 whose inner diameter decreases as it goes away along O, and in the second joining step, the end faces 15, 31A, 31B of the first member (tube body 10, rod body 30) and the second member (head). A fluid material that plastically flows from the flange portions 25, 42, and 52 of the member 20, the screw member 40, and the rod head 50) protrudes from the flange portions 25, 42, and 52 until the tip portion T is located within the range of the inclined inner peripheral surface 13 in the rotation axis O direction. The fitting clearance FC is filled from the root side of the portions 21, 41, 51, and the non-contact portion 26 of the flange portions 25, 42, 52 facing the fitting clearance FC is filled with a fluid material. b is joined to the first member (tube body 10, rod body 30), and the outer peripheral surface of the protrusion 21 is joined to the first member (tube body 10, rod body 30).

In this configuration, in the second joining step, the fluidized material has a fitting clearance until the tip portion T thereof is located within the range of the inclined inner peripheral surface 13 of the first member (tube body 10, rod body 30) in the axial direction. Is filled with. The inner diameter of the inclined inner peripheral surface 13 becomes smaller as it is separated from the end surfaces 15, 31A, 31B of the first member (tube body 10, rod body 30) along the rotation axis O. Therefore, the radial fitting clearance FC formed between the inclined inner peripheral surfaces 13 and the outer peripheral surfaces of the protrusions 21, 41, and 51 is provided with the first member (tube body 10, rod body) in the second joining step. 30) and the second member (head member 20, screw member 40, rod head 50) become smaller as they are pressed along the rotation axis O. Therefore, in the first joining step, the protruding portions 21, 41, 51 of the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) are unintentionally The fitting clearance FC between the first member (tube body 10, rod body 30) and the protruding portion 21 of the second member (head member 20, screw member 40, rod head 50) is relatively set so as not to come into contact with the rod head 50. Even if the size is increased, the fluid material is filled in the fitting clearance FC which has become relatively small in the second joining step. Therefore, the surface area of the fluid material filled in the fitting clearance FC in contact with air is suppressed, and the generation of oxide scale is suppressed. Therefore, in the production of the bonded body, the generation of oxide scale and the bonding defect are suppressed.

Further, in the method for manufacturing a joined body according to the present embodiment, the protruding portions 21, 41, and 51 have a cylindrical outer peripheral surface 22 having a uniform outer diameter along the axis of rotation O, and a cylindrical outer peripheral surface 22. It is an outer peripheral surface of the protruding portion 21 provided on the tip end side of the protruding portions 21, 41, 51 and joined to the inclined inner peripheral surface 13 of the hollow portion (through holes 11, 30A) by a fluid material, and rotates from the flange portion 25. It has an inclined outer peripheral surface 23 whose outer diameter becomes smaller as it is separated along the axis O, and the first member (tube body 10, rod body 30) is connected to the end surface 15 and has an inner diameter of one along the rotation axis O. Further having a first cylindrical inner peripheral surface 12 formed in the same manner, in the first joining step, the inclined outer peripheral surface 23 of the protruding portion 21 is inside the inclined inner peripheral surface 13 of the hollow portion (through holes 11, 30A). The first clearance FC1 that is accommodated and is generated between the inner peripheral surface 12 of the first cylinder of the hollow portion (through holes 11, 30A) and the outer peripheral surface 22 of the cylinder of the protruding portion 21 is the hollow portion (through holes 11, 30A). It is configured to be smaller than the second clearance FC2 generated between the inclined inner peripheral surface 13 and the inclined outer peripheral surface 23 of the protruding portions 21, 41, 51.

In this configuration, the first clearance FC1 generated on the root side of the protrusions 21, 41, 51 is smaller than the second clearance FC2, so that even if the protrusions 21, 41, 51 are shaken, they are relatively small. The inner peripheral surface 12 of the first cylinder forming the first clearance FC1 and the outer peripheral surface 22 of the cylinder come into contact with each other. Therefore, the contact between the inclined inner peripheral surface 13 of the tube main body 10 on the distal end side of the protruding portions 21, 41, 51 and the inclined outer peripheral surface 23 of the protruding portion 21 is suppressed, and the unintended first on the distal end side of the protruding portion 21. Contact between the member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) can be suppressed. Therefore, the protrusions 21, 41, and 51 are melted by unintended contact between the first member (tube body 10, rod body 30) and the second member (head member 20, screw member 40, rod head 50) on the tip end side. It is possible to prevent the resulting material from forming as burrs in the hollow portion (through holes 11, 30A).

Further, in the method for manufacturing a joined body according to the present embodiment, the inclined inner peripheral surface 13 is a tapered surface inclined at a predetermined angle with respect to the rotation axis O, and the inclined outer peripheral surface 23 is an inclined inner peripheral surface 13. It is a tapered surface that is inclined with respect to the rotation axis O at the same angle.

Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiments. not.

10 ... Tube body (first member), 11 ... Through hole (hollow portion), 12 ... First cylinder inner peripheral surface (cylindrical inner peripheral surface), 13 ... Inclined inner peripheral surface, 15 ... End surface, 16 ... Vertical end surface, 17 ... Inclined end face, 20 ... Head member (second member), 21 ... Protruding portion, 22 ... Cylindrical outer peripheral surface, 23 ... Inclined outer peripheral surface, 25 ... Flange portion, 26 ... End surface, 26a ... Contact portion, 26c ... Escape Part, 27 ... Flange vertical surface, 28 ... Flange inclined surface, 30 ... Rod body (first member), 30A ... Through hole (hollow part), 40 ... Screw member (second member) 41 ... Protruding part, 42 ... Flange part, 43 ... end face, 50 ... rod head (second member), 51 ... protruding part, 52 ... flange part, 100 ... cylinder tube (joint body), 101 ... piston rod (joint body), FC ... fitting clearance , FC1 ... 1st clearance (root side clearance), FC3 ... 3rd clearance (tip side clearance), OC ... facing clearance, O ... rotating shaft

Claims (3)

A first member having a hollow portion formed on an end face and a second member having a protruding portion fitted to the hollow portion and a flange portion provided radially outward from the protruding portion are joined and joined. It is a manufacturing method that manufactures the body.
The first member and the second member are rotated relative to each other around a rotation axis, and the end surface of the first member and the flange portion of the second member are brought into contact with each other so that the end surface and the flange portion are brought into contact with each other. The first joining process that generates frictional heat between them,
With the relative rotation speed of the first member and the second member lower than that of the first joining step, the first member and the second member move relative to each other along the rotation axis in a direction close to each other. A second joining step of joining the end face of the first member and the flange portion of the second member is included.
In the first joining step, the contact portion of the flange portion of the second member is brought into contact with the end surface of the first member, and the flange portion is provided on the outer side in the radial direction of the contact portion. A facing clearance is formed between the relief portion separated from the end surface of the first member and the end surface of the first member.
In the second joining step, the facing clearance is filled with a fluid material that plastically flows from between the end surface of the first member and the contact portion of the flange portion of the second member to form the relief portion. A method for manufacturing a bonded body, which comprises joining the end face of the first member. The flange portion has a flange inclined surface that is continuous with the outer peripheral surface of the protruding portion and is inclined with respect to the rotation axis to provide the contact portion.
The method for manufacturing a bonded body according to claim 1, wherein the end surface of the first member is provided with an inclined end surface formed in a shape corresponding to the flange inclined surface and in contact with the contact portion. The flange portion has a flange vertical surface provided with the contact portion and formed perpendicular to the rotation axis.
The end face of the first member is provided with a vertical end face formed perpendicular to the rotation axis and in contact with the contact portion.
At least one of the relief portion of the flange portion and a part of the end face facing the relief portion is formed so as to be inclined with respect to the rotation axis so as to be separated from the other and form the facing clearance. The method for manufacturing a bonded body according to claim 1.

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