JP2005001154A - Method and apparatus for bending end part of cylindrical elastomer member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus capable of suitably bending the end part of a cylindrical elastomer member and capable of shortening a program replacing time, and a method using it. <P>SOLUTION: This method for bending the end part of the cylindrical elastomer member is composed of a process for externally mounting steel rings 12 on the rubber hose 2 molded on the outer periphery of a mandrel 1 at a predetermined position, a process for moving a diameter expanding mechanism 20, which has pawl parts 3 and is divided into a plurality of parts to be arranged along the outer periphery of the mandrel 1, in the axial direction of the mandrel 1 to insert the pawl parts 3 in the gap between the mandrel 1 and the rubber hose 2 at a predetermined position, a process for moving the diameter expanding mechanism 20 to the outside in the diametric direction of the mandrel 1 to expand the diameter of the end part of the mandrel 1 by the pawl parts 3 and a process for moving the diameter expanding mechanism 20 in the axial direction of the mandrel 1 to push the end part of the rubber hose 2 in the axial direction of the mandrel 1 by the pawl parts 3 and bending the end part of the rubber hose 2 so as to cover the steel rings 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for bending an end portion of a cylindrical elastic member, and is particularly useful for manufacturing a rubber hose having a gasket portion.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a rubber hose having a gasket portion, a steel ring is sheathed on the rubber hose, and an end portion of the rubber hose is bent so as to cover the steel ring, thereby forming a gasket portion.
[0003]
For such purposes, the end of the rubber hose can be bent (turned up) by, for example, manually bending the end of the rubber ring after positioning the steel ring, or by using an outer diameter smaller than the product inner diameter on the mandrel end face. There is a method in which a rubber bag having a rubber is installed, air is supplied to the rubber bag, and the end portion of the rubber is bent using the swelling.
[0004]
In addition, a folding multi-layer collar is installed coaxially with the mandrel on which the rubber hose is formed on the outer peripheral side, and each collar is inserted into the inner surface of the rubber hose in ascending order of the inner diameter. A method and an apparatus have been proposed in which the end of the rubber hose is bent by pushing the outermost layer collar last in the mandrel axial direction, which is larger than the value obtained by adding the thickness of the rubber hose (see Patent Document 1 below). .
[0005]
[Patent Document 1]
JP-A-8-1815 (second page, FIG. 4, FIG. 5)
[Problems to be solved by the invention]
However, the manual method causes an increase in man-hours and a decrease in adhesion, and the rubber bag method cannot be applied to a small-diameter hose. Furthermore, if the thickness of the rubber hose is thick, the end of the rubber hose cannot be bent by manual work or a rubber bag, which is inappropriate.
[0006]
Further, the folding multi-layer collar provided in the device described in Patent Document 1 is a multi-layered cylindrical member, and is very heavy. Therefore, every time the diameter of the rubber hose changes, it takes time to change the setup. Take it. Therefore, there has been a problem that the production efficiency is lowered.
[0007]
Then, the objective of this invention is providing the apparatus and method which can bend the edge part of cylindrical elastic-body members, such as a rubber hose, suitably. Another object of the present invention is to provide an apparatus and a method capable of shortening the setup change time in addition to the above object.
[0008]
[Means for Solving the Problems]
The above object can be achieved by the present invention as described below.
That is, the end bending method of the cylindrical elastic member according to the present invention includes a step of sheathing a high-rigidity ring at a predetermined position with respect to the cylindrical elastic member formed on the outer periphery of the mandrel, and a claw portion. In addition, by moving the diameter expanding mechanism or the mandrel divided into a plurality along the outer periphery of the mandrel in the axial direction of the mandrel, the claw portion is placed between the mandrel and the cylindrical elastic member. A step of inserting at a predetermined position, a step of expanding the diameter of an end portion of the cylindrical elastic member by moving the diameter expansion mechanism radially outward of the mandrel, and the mandrel or the mandrel By moving the diameter expansion mechanism in the axial direction of the mandrel, the claw portion pushes the end portion of the cylindrical elastic body member in the axial direction of the mandrel and covers the high-rigidity ring. Bending the end of the body member.
[0009]
According to the method of bending the end of the cylindrical elastic member according to the present invention, the claw portion of the diameter expanding mechanism divided and arranged in a plurality along the outer periphery of the mandrel is inserted between the mandrel and the cylindrical elastic member. Then, the diameter of the end of the cylindrical elastic member can be expanded and the end of the cylindrical elastic member can be bent so as to cover the high-rigidity ring by being pushed in the axial direction of the mandrel. Thereby, it does not cause an increase in man-hours and a decrease in adhesion force unlike the manual method, and can be suitably applied to a cylindrical elastic member having a small diameter, which was difficult with the rubber bag method. Furthermore, since it can be bent mechanically, it can be suitably applied to a cylindrical elastic body member having a large thickness.
[0010]
In the above, when the diameter expansion mechanism moves outward in the radial direction of the mandrel, the inner peripheral surface of the claw portion is at least at the outer peripheral position of the high-rigidity ring in the radial direction of the mandrel. It is preferable to move to a position to which the thickness is added.
[0011]
Thereby, when the claw part pushes in the end part of the cylindrical elastic body member, the end part of the cylindrical elastic body member can be bent so as to suitably cover the high-rigidity ring. Here, the outer peripheral position of the high-rigidity ring refers to the position of the outer periphery of the high-rigidity ring in the radial direction of the mandrel.
[0012]
In the above, it is preferable to insert the claw portion between the mandrel and the cylindrical elastic member while rotating the mandrel.
[0013]
By inserting the claw portion between the mandrel and the cylindrical elastic member while rotating the mandrel, the claw portion can be smoothly inserted.
[0014]
Moreover, the end part bending apparatus of the cylindrical elastic body member of the present invention covers the end portion of the cylindrical elastic body member formed on the outer periphery of the mandrel with the high-rigidity ring that is externally mounted on the cylindrical elastic body member. In the bending apparatus, a holding member that holds the mandrel, a claw portion, a diameter expanding mechanism that is divided into a plurality along the outer periphery of the mandrel, and the mandrel or the diameter expanding mechanism are disposed on the mandrel. A first driving device that moves in the axial direction; a second driving device that moves the diameter-expanding mechanism in the radial direction of the mandrel; and a movement of the mandrel or the diameter-expanding mechanism in the axial direction of the mandrel, The claw portion is inserted into a predetermined position between the mandrel and the cylindrical elastic member, the diameter expanding mechanism is moved outward in the radial direction of the mandrel, and the diameter of the end of the cylindrical elastic member is reduced. Expand the mandrel or the diameter expansion mechanism in the axial direction of the mandrel The claw portion pushes the end portion of the cylindrical elastic body member in the axial direction of the mandrel, and the end portion of the cylindrical elastic body member is bent so as to cover the high-rigidity ring. A drive device and a control device for controlling the second drive device.
[0015]
According to the end bending apparatus for a cylindrical elastic member according to the present invention, the above-described effects can be suitably achieved. In addition, since the first and second drive devices are controlled by the control device, the end of the cylindrical elastic member can be bent easily and reliably.
[0016]
In the above, the diameter expansion mechanism includes the claw portion and a slide portion configured to be movable in the radial direction of the mandrel by a second driving device, and the claw portion is configured to be detachable from the slide portion. It is preferable that
[0017]
Since the diameter expansion mechanism consists of a slide part and a claw part configured to be detachable from the slide part, when bending the end of a cylindrical elastic body member having a different diameter, only the claw part is replaced. Can easily cope with this. Thereby, the setup change time can be shortened and the production efficiency can be increased.
[0018]
In the above, the claw portion is configured to be detachable from the slide portion by a dovetail groove and a convex portion that fits into the dovetail groove, and an engagement member that engages with a notch recess formed in the slide portion. It is preferable to provide.
[0019]
Since the claw portion is configured to be detachable from the slide portion by the fitting action of the dovetail groove and the convex portion, the claw portion can be easily replaced. Further, the claw portion can be positioned and fixed by engaging the engaging member with the notch recess provided in the slide portion. As a result, the setup change time can be shortened, and the production efficiency can be suitably increased.
[0020]
In the above, a third drive device that rotates the mandrel is provided, and the control device rotates the mandrel when the claw portion is inserted between the mandrel and the cylindrical elastic member. It is preferable to control the third drive device.
[0021]
By inserting the claw portion between the mandrel and the cylindrical elastic member while rotating the mandrel, the claw portion can be smoothly inserted.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of a cylindrical elastic body member end bending apparatus according to the present invention as seen from the side. FIG. 2 is a front view showing the arrangement of the diameter expansion mechanism with respect to the frame.
[0023]
The end bending apparatus 10 includes a mandrel 1 (corresponding to the mandrel), frames 9a and 9b, a diameter expansion mechanism 20, and a mandrel receiver 11 (corresponding to a holding member). A rubber hose 2 (corresponding to the cylindrical elastic member) having a certain thickness is formed on the outer peripheral side of the mandrel 1, and a steel ring 12 (the high-rigidity ring) is maintained at a predetermined distance from both ends thereof. Is the exterior. The rubber hose 2 is composed of a rubber layer and a reinforcing fiber layer. To form a gasket portion, it is necessary to bend the end portion without reducing the adhesion between the rubber layer and the reinforcing fiber layer.
[0024]
Frames 9 a and 9 b and a mandrel receiver 11 are installed on both sides of the mandrel 1 in the axial direction, and a hole 13 coaxial with the mandrel 1 is provided in the frame 9 a. The mandrel 1 is inserted through the hole 13, and its end is held by the mandrel receiver 11. The frame 9a is moved in the axial direction of the mandrel 1 by a first servo motor 16 (corresponding to the first driving device), and the mandrel receiver 11 is moved to a third servo motor 18 (corresponding to the third driving device). )).
[0025]
The frame 9a is provided with four diameter expansion mechanisms 20 around the axis of the mandrel 1 in the four corner directions of the frame 9a. Each of the diameter expansion mechanisms 20 includes a slider 5 (corresponding to the slide part) and a claw part 3 attached to the slider 5, and the slider 5 corresponds to a second servo motor 6 (corresponding to the second driving device). To move along the linear motion guide 4. The claw portion 3 is disposed in the circumferential direction along the outer periphery of the mandrel 1, and is moved in the radial direction of the mandrel 1 together with the slider 5 by the second servo motor 6. The adjacent claw portions 3 may be in contact with each other in a state where the claw portions 3 are located on the innermost side in the radial direction of the mandrel 1 (a state in which the inner peripheral surface of the claw portion 3 is in contact with the outer peripheral surface of the mandrel 1). Alternatively, they may be separated. The driving of the first to third servomotors 16, 6, 18 is controlled by a control device (not shown).
[0026]
In the end bending process of the rubber hose 2 to be described later, the claw portions 3 having the same size are attached to the four sliders 5 respectively. In the example of FIG. 2, the upper two sliders 5 have a relatively small diameter (for example, a diameter). 50 mm) of the rubber hose 2 is shown, and the lower two sliders 5 are provided with the claw portion 3 corresponding to the rubber hose 2 having a relatively large diameter (for example, a diameter of 300 mm). Thus, since the nail | claw part 3 corresponding to it can be suitably attached with the aperture of the rubber hose 2 to be bent, the aperture of the rubber hose 2 whose end can be bent according to the present invention is not particularly limited.
[0027]
A front view showing one of the diameter expansion mechanisms 20 according to the present invention is shown in FIG. 3, a side view is shown in FIG. 4, and a top view is shown in FIG.
[0028]
The claw portion 3 is formed in an L shape when viewed from the side, and the portion inserted between the mandrel 1 and the rubber hose 2 is preferably processed into a tapered shape so that the insertion can be easily performed. Moreover, it is preferable that the front-end | tip part is processed into R0.5-R1.0 so that a nail | claw part may not damage the rubber hose 2.
[0029]
The claw portion 3 has a convex portion 14 on the side attached to the slider 5, and is configured to be detachable from the slider 5 by a fitting action between the convex portion 14 and the dovetail groove 7 formed in the slider 5. ing. The claw portion 3 includes a ball plunger 8 (corresponding to the engaging member), and a notch recess is formed at a predetermined position of the slider 5.
[0030]
FIG. 6 is a cross-sectional view illustrating the relationship between the ball plunger 8 and the notch recess 15. A ball 17 biased by a spring 21 is provided at the tip of the ball plunger 8. When the ball plunger 8 reaches the position of the notch recess 15, the ball 17 engages with the notch recess 15. Thereby, positioning and fixation of the nail | claw part 3 are ensured. Further, when removing the claw portion 3 from the slider 5, the claw portion 3 may be slid with respect to the slider 5 with a force that resists the biasing force of the spring 21. Therefore, by using the ball plunger 8, the claw portion 3 can be attached and detached easily and reliably without damaging the slider 5.
[0031]
Next, a method for bending the end portion of the rubber hose according to the present invention will be described with reference to the drawings. FIG. 7 is a view for explaining the end bending process of the rubber hose, and the movement of the diameter expanding mechanism 20 is shown by two opposing claw portions 3.
[0032]
First, both ends of the mandrel 1 having the rubber hose 2 formed on the outer peripheral side are set on the mandrel receiver 11. At this time, the steel ring 12 is previously sheathed at a predetermined position of the rubber hose 2. Further, as shown in FIG. 7A, the claw portions 3 are arranged in the circumferential direction along the outer periphery of the mandrel 1. Then, the first servo motor 16 drives the frame 9 a in the axial direction of the mandrel 1 so that the claw portion 3 approaches the rubber hose 2. As shown in FIG. 7B, when the claw portion 3 is inserted between the rubber hose 2 and the mandrel 1 and reaches a predetermined position, the movement of the frame 9a stops. When the claw portion 3 is inserted, it is preferable to insert the claw portion 3 while rotating the mandrel 1, and it is preferable to apply a lubricant to the end portion of the rubber hose 2. Thereby, insertion of the nail | claw part 3 can be performed smoothly.
[0033]
After stopping the movement of the frame 9 a and the rotation of the mandrel 1, the slider 5 is moved in the radial direction of the mandrel 1. Thereby, each claw part 3 expands the diameter of the end of rubber hose 2. At this time, as shown in FIG. 7C, the inner peripheral surface of each claw portion 3 (the surface that is in contact with the outer peripheral surface of the mandrel 1) is the outer peripheral position R <b> 1 of the steel ring 12 in the radial direction of the mandrel 1. It is preferable to move to the position R2 to which the thickness T of the rubber hose 2 is added. In the above, as shown in FIG. 8, the position R <b> 2 may be a position obtained by adding the thickness T of the rubber hose 2 and a slight margin α to the outer peripheral position R <b> 1 of the steel ring 12. Thereby, the rubber hose 2 can be bent more suitably.
[0034]
7 (d), when the frame 9a is moved in the axial direction of the mandrel 1, the claw portion 3 pushes the end of the rubber hose 2 in the axial direction of the mandrel 1, and the end of the rubber hose 2 is steel. It is bent so as to cover the ring 12. In addition, after the mandrel 1 and the steel ring 12 are set, the above steps can be automatically performed by the control device.
[0035]
The bent end portion is formed into a final shape as a gasket portion by applying a stitcher. Regarding the bending of the other end portion, the mandrel 1 may be reversed after one bending, and the above-described steps may be performed. Also, both sides of the mandrel 1 may be formed using a device in which the diameter expansion mechanism 20 is installed in the frame 9a and the frame 9b. The bending process may be performed at.
[0036]
[Other Embodiments]
(1) In the above-described embodiment, the example in which each claw portion 3 moves in the axial direction of the mandrel 1 after the step of enlarging the diameter of the end portion of the rubber hose 2 and pushes the end portion in the axial direction is shown. In the present invention, these steps may be performed simultaneously. In other words, each claw portion 3 may move in the axial direction of the mandrel 1 while expanding the diameter of the end portion and push the end portion in the axial direction. As a result, the process can be shortened, and bending becomes easy and workability is improved.
[0037]
(2) In the above-described embodiment, an example in which the four diameter expansion mechanisms 20 are provided on the frame 9a has been described. However, in the present invention, the number of the four diameter expansion mechanisms 20 is four as long as it is divided into a plurality along the outer periphery of the mandrel 1. It is not limited to one. However, it is preferable that the number of the diameter expansion mechanisms 20 provided in one frame is 3-6. If it is two, it will be difficult to expand the diameter of the rubber hose end, and if it is seven or more, the replacement of the claw and the like will be complicated, and the production efficiency will be hindered.
[0038]
(3) In the above-described embodiment, the example in which the diameter expansion mechanism 20 is provided in the four corner directions of the frame 9a has been described, but the present invention is not limited to this example. For example, the frame 9a may be provided vertically and horizontally.
[0039]
(4) In the above-described embodiment, an example in which the claw portion 3 is configured to be detachable from the slider 5 by the fitting action of the convex portion 14 of the claw portion 3 and the dovetail groove 7 formed in the slider 5. In the present invention, the dovetail groove 7 is formed in the claw portion 3, and the slider 5 may have a convex portion 14 that fits in the dovetail groove 7.
[0040]
(5) In the above-described embodiment, an example of the rubber hose is shown as the cylindrical elastic member, but the present invention is not limited to this. In addition, the thickness of the cylindrical elastic member is generally selected from 5 to 10 mm. However, in the present invention, even a relatively thick member (for example, 12 to 15 mm) can be suitably bent.
[Brief description of the drawings]
FIG. 1 is an overall view of a cylindrical elastic body member end bending apparatus according to the present invention as viewed from the side. FIG. 2 is a front view showing the arrangement of a diameter expansion mechanism with respect to a frame. FIG. 4 is a side view showing one of the diameter expansion mechanisms. FIG. 5 is a top view showing one of the diameter expansion mechanisms. FIG. 6 is a cross-sectional view showing the engaging member in this embodiment. [Fig. 8] A diagram explaining the end bending process of the rubber hose. [Fig. 8] A diagram explaining the positional relationship of the claw portion in the diameter expanding step.
DESCRIPTION OF SYMBOLS 1 Mandrel 2 Rubber hose 3 Claw part 5 Slider 9a Frame 10 End bending apparatus 12 Steel ring 20 Diameter expansion mechanism

Claims (7)

For the cylindrical elastic member formed on the outer periphery of the mandrel, a step of exteriorizing the high-rigidity ring at a predetermined position;
The diameter expanding mechanism or the mandrel, which has a claw portion and is divided and arranged in a plurality along the outer periphery of the mandrel, is moved in the axial direction of the mandrel, so that the mandrel and the cylindrical elastic body are moved. Inserting into a predetermined position between the members;
A step of expanding the diameter of the end portion of the cylindrical elastic member by the claw portion by moving the diameter expansion mechanism radially outward of the mandrel;
By moving the mandrel or the diameter expansion mechanism in the axial direction of the mandrel, the claw portion pushes the end of the cylindrical elastic member in the axial direction of the mandrel so as to cover the high-rigidity ring. And a step of bending the end of the cylindrical elastic member. The method of bending an end of the cylindrical elastic member. When the diameter expansion mechanism moves outward in the radial direction of the mandrel, the inner peripheral surface of the claw portion has a thickness of the cylindrical elastic member at least at the outer peripheral position of the high-rigidity ring in the radial direction of the mandrel. The end bending method of the cylindrical elastic member according to claim 1, wherein the end elastic member is moved to the added position. The method of bending an end of a cylindrical elastic member according to claim 1 or 2, wherein the claw portion is inserted between the mandrel and the cylindrical elastic member while rotating the mandrel. In an apparatus for bending an end of a cylindrical elastic member formed on the outer periphery of a mandrel so as to cover a high-rigidity ring sheathed on the cylindrical elastic member,
A holding member for holding the mandrel;
A diameter expansion mechanism having a claw portion and divided and arranged in a plurality along the outer periphery of the mandrel,
A first drive device for moving the mandrel or the diameter expansion mechanism in the axial direction of the mandrel;
A second drive device for moving the diameter-expanding mechanism in the radial direction of the mandrel;
By moving the mandrel or the diameter expanding mechanism in the axial direction of the mandrel, the claw portion is inserted into a predetermined position between the mandrel and the cylindrical elastic member, and the diameter expanding mechanism is inserted into the mandrel. It moves radially outward to increase the diameter of the end of the cylindrical elastic member, move the mandrel or the diameter-enlarging mechanism in the axial direction of the mandrel, and the claw portion of the cylindrical elastic member A control device for controlling the first driving device and the second driving device so as to push the end portion in the axial direction of the mandrel and bend the end portion of the cylindrical elastic member so as to cover the high-rigidity ring; A device for bending an end portion of a cylindrical elastic body member. The diameter expansion mechanism includes the claw portion and a slide portion configured to be movable in the radial direction of the mandrel by a second driving device,
The end portion bending apparatus for a cylindrical elastic body member according to claim 4, wherein the claw portion is configured to be detachable from the slide portion. The claw portion is configured to be detachable from the slide portion by a dovetail groove and a convex portion fitted in the dovetail groove,
The end bending apparatus for a cylindrical elastic member according to claim 5, further comprising an engaging member that engages with a notch recess formed in the slide portion. A third drive for rotating the mandrel;
The said control apparatus controls the said 3rd drive device so that the said mandrel may be rotated, when inserting the said nail | claw part between the said mandrel and the said cylindrical elastic body member. An end bending apparatus for the cylindrical elastic member according to claim.

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