JP2020185640A - Edge replaceable cutting tool and pressing member - Google Patents

Abstract

To cool a cutting insert also from the inside.SOLUTION: A cutting insert 3 seated on a bottom surface 2A of an insert attachment seat 2 formed on a tool body 1 is pressed by a pressing member 4 having a pressing surface 4E opposite to the bottom surface 2A so as to be detachably mounted. The cutting insert 3 is formed with a through hole 3B which is open in a seating surface 3C seated on the bottom surface 2A of the insert attachment seat 2 and in a pressed surface 3C pressed by the pressing surface 4E of the pressing member 4 so as to penetrate through the cutting insert 3. The tool body 1 is formed with a coolant hole 5 which is open in the bottom surface 2A of the insert attachment seat 2 so as to communicate with the through hole 3B. The pressing member 4 is formed with a hole part 8D which is open in the pressing surface 4E and so as to communicate with the through hole 3B and extends toward a cutting edge 3A formed on an outer periphery of the pressed surface 3C of the cutting insert 3.SELECTED DRAWING: Figure 2

Description

In the present invention, a cutting insert seated on the bottom surface of an insert mounting seat formed on a tool body is detachably attached by being pressed by a pressing member having a pressing surface facing the bottom surface. The present invention relates to a cutting tool having a replaceable cutting edge having a coolant hole formed in the tool body, and a pressing member attached to such a cutting tool having a replaceable cutting edge.

As such a cutting tool with a replaceable cutting edge, for example, in Patent Document 1, the top surface, the bottom surface, the front surface, the rear surface on the side opposite to the front surface, and the front opening and the rear surface opening penetrating from the front surface to the rear surface. The front opening is a wedge member having two side walls of different lengths that are parallel and substantially flat, and two arcuate side walls that connect the two side walls. A cutting tool with a replaceable cutting edge, in which a cutting insert is detachably attached to an insert mounting seat of a tool body by a (pressing member), is described. At the time of cutting, the coolant liquid is supplied from the coolant hole formed in the tool body to the rear opening of the hole of the wedge member and discharged from the front opening of the hole.

U.S. Pat. No. 9,387,537

By the way, in the cutting process using such a cutting tool with a replaceable cutting edge, the cutting heat generated when the cutting edge cuts the work material is transmitted from the cutting edge to the cutting insert, and the inside of the cutting insert itself becomes high. However, in the cutting tool with replaceable cutting edge described in Patent Document 1, the coolant liquid is applied to the inner peripheral side of the tool body of the pressed surface of the cutting insert pressed by the wedge member and the outer periphery of the tool body in which the cutting edge is arranged. The inside of the cutting insert cannot be cooled because it is only supplied to the side, and the cutting insert may be distorted due to the cutting heat accumulated inside during long-term continuous cutting.

The present invention has been made under such a background, and it is possible to cool the cutting insert from the inside, and it is possible to prevent the cutting insert from being distorted even after long-term continuous cutting. It is an object of the present invention to provide a cutting tool with a replaceable cutting edge and a pressing member attached to such a cutting tool with a replaceable cutting edge.

In order to solve the above-mentioned problems and achieve such an object, in the cutting tool of the present invention, the cutting insert seated on the bottom surface of the insert mounting seat formed on the tool body has the above-mentioned bottom surface. A cutting tool with a replaceable cutting edge that can be detachably attached by being pressed by a pressing member having a pressing surface facing the insert. The cutting insert includes a seating surface that sits on the bottom surface of the insert mounting seat and the pressing. A through hole is formed through the cutting insert by opening into the pressed surface pressed by the pressing surface of the member, and the through hole is opened in the bottom surface of the insert mounting seat in the tool body. A coolant hole is formed in the pressing member, and the pressing member has a hole that opens in the pressing surface and communicates with the through hole, and extends toward a cutting edge formed on the outer periphery of the pressed surface of the cutting insert. Alternatively, it is characterized in that a groove is formed.

Further, the pressing member of the present invention is a pressing member attached to such a cutting tool with a replaceable cutting edge, and a hole or a groove is formed which opens in the pressing surface and extends toward the cutting edge of the cutting insert. It is characterized by being done.

In the cutting tool with a replaceable cutting edge having the above configuration, in which the cutting insert is detachably attached by such a pressing member, when the coolant is supplied to the coolant hole of the tool body from the supply portion, the coolant is cut from the bottom surface of the insert mounting seat. It flows into the through hole of the insert, further flows into the hole or groove of the pressing member from this through hole, and is discharged toward the cutting edge of the cutting insert.

Therefore, not only the cutting edge of the cutting insert can be cooled by the discharged coolant, but also the cutting insert can be cooled from the inside by the coolant passing through the through hole. Therefore, it is possible to prevent the cutting heat from accumulating inside the cutting insert even after long-term continuous cutting, and it is possible to prevent the cutting insert from being distorted by such cutting heat.

Here, in the cutting tool with replaceable cutting edge described in Patent Document 1 described above, the coolant hole of the tool body is also opened in the recess of the tool body to which the wedge member is attached, and the tool body is also opened from this recess. Coolant is discharged toward the outer peripheral side of the. However, the coolant discharged in this way has no cooling effect inside the cutting insert and is not effective in cooling the cutting edge, resulting in a loss of coolant.

Therefore, the coolant hole and the through hole are not opened except for the bottom surface of the insert mounting seat and the seating surface of the cutting insert except for the coolant supply portion to the coolant hole, and the through hole It is desirable that the hole or groove is not opened except for the pressing surface and the pressed surface, except for the coolant discharging portion from the hole or groove. As a result, even a small amount of coolant can be concentrated and effectively act on the inside of the cutting insert and the cooling of the cutting edge.

Further, the tool body is formed with a recess communicating with the insert mounting seat, and the pressing member is a wedge member inserted into the recess, whereby the through hole and the hole or groove are formed. It is relatively easy to form the and so as not to open other than the pressed surface and the pressed surface except for the coolant discharging portion from the hole portion or the groove portion.

Further, in order to stably discharge the coolant from the hole or groove toward the cutting edge of the cutting insert in the pressing member, a recess is formed in the pressing surface of the pressing member so that the coolant is temporarily accumulated in the recess. It is desirable that the hole portion or the groove portion is formed so as to extend from the recessed portion toward the cutting edge of the cutting insert.

Further, in the cutting tool with a replaceable cutting edge of the present invention, a plurality of the insert mounting seats are formed on the outer periphery of the tip of the tool body that is rotated around the axis, and the cutting insert is attached to and detached from each of the insert mounting seats. In the case of a cutting tool with a replaceable cutting edge that can be attached, even if the pressing member is a wedge member that is inserted into the recess formed in the tool body as described above, the rigidity of the tool body is suppressed from being impaired. be able to.

As described above, according to the present invention, the cutting insert can be cooled not only from the cutting edge but also from the inside, and it is possible to prevent the cutting heat from accumulating inside the cutting insert even after long-term continuous cutting. Therefore, it is possible to prevent the cutting insert from being distorted due to such cutting heat.

It is a perspective view which shows the 1st Embodiment of the cutting tool of the cutting edge exchange type of this invention. It is a ZZ cross-sectional view in FIG. It is a perspective view which shows the 1st Embodiment of the pressing member of this invention attached to the embodiment shown in FIG. It is a side view of the embodiment shown in FIG. It is a front view of the arrow line A direction view in FIG. It is a rear view of the arrow line B direction view in FIG. It is a bottom view of the arrow C direction view in FIG. It is a top view of the arrow line D direction view in FIG. It is a perspective view of the pressing member of 1st Embodiment which shows the ZZ cross section in FIG. It is a perspective view which shows the 2nd Embodiment of the cutting tool of the cutting edge exchange type of this invention. It is a perspective view which shows the 2nd Embodiment of the pressing member of this invention attached to the embodiment shown in FIG. It is a perspective view of the pressing member of the 2nd Embodiment corresponding to the ZZ cross section in FIG. It is a perspective view which shows the 3rd Embodiment of the pressing member of this invention. It is a perspective view of the pressing member of the 3rd Embodiment corresponding to the ZZ cross section in FIG.

1 and 2 show a first embodiment of the cutting tool with a replaceable cutting edge of the present invention, and FIGS. 3 to 9 show a book attached to the cutting tool with a replaceable cutting edge of the first embodiment. It shows the first embodiment of the pressing member of the invention.

The cutting tool with a replaceable cutting edge in the first embodiment has a plurality of cutting tools on the outer periphery of the tip portion (lower portion in FIG. 1) of the disk-shaped tool body 1 centered on the axis O, which is rotated around the axis O. An insert mounting seat 2 is formed, and a cutting insert 3 is detachably attached to each insert mounting seat 2 by the pressing member 4 of the first embodiment. More specifically, the cutting tool is a cutting tool with a replaceable cutting edge. It is a replaceable front milling cutter.

The tool body 1 and the pressing member 4 are formed of a metal material such as a steel material, and a mounting hole 1A for mounting the tool body 1 on the spindle of the machine tool is formed in the central portion of the disk-shaped tool body 1. At the same time, at the rear end portion (upper portion in FIG. 1) of the tool body 1, a mounting portion 1B having a diameter smaller than that of the tip portion with a key groove for mounting the tool body 1 on the spindle of the machine tool is formed. ..

Such a cutting tool with a replaceable cutting edge (a cutting tool with a replaceable cutting edge) is attached to the spindle of a machine tool by the mounting hole 1A and the mounting portion 1B via an arbor or the like, and rotates in the tool rotation direction T around the axis O. In the case of a face milling cutter with a replaceable cutting edge as in the present embodiment, the milling cutter is sent out in a direction perpendicular to the axis O, and the work material is cut by the cutting insert 3 attached to the insert mounting seat 2.

The cutting insert 3 is formed of a metal material harder than the tool body 1 such as cemented carbide in the present embodiment in the shape of a polygonal plate, particularly in the shape of a regular heptagon. In the two regular heptagonal surfaces of the cutting insert 3, when one regular heptagonal surface is regarded as a rake surface and is directed in the tool rotation direction T, the other regular heptagonal surface side is the tool rotation of the insert mounting seat 2. It is seated on a flat bottom surface 2A facing the direction T. A cutting edge 3A is formed on the peripheral edge portion of these two regular heptagonal surfaces on the outer peripheral side.

Further, as shown in FIG. 2, the central portion of the two regular heptagonal surfaces of the cutting insert 3 has a circular cross section with a constant inner diameter centered on the insert center line C passing through the centers of these two regular heptagonal surfaces. A through hole 3B that penetrates the cutting insert 3 is open. Further, a flat flat surface 3C perpendicular to the insert center line C is formed around the opening of the through hole 3B in the two regular heptagons, and the other regular heptagon used as the seating surface. In terms of the surface, the flat surface 3C is seated in close contact with the bottom surface 2A of the insert mounting seat 2 as a seating surface.

Furthermore, the seven side surfaces arranged around the two regular heptagonal surfaces are the flanks of the cutting edge 3A, and these flanks extend parallel to the insert center line C, and the cutting insert of the present embodiment. Reference numeral 3 denotes a negative type cutting insert. The insert mounting seat 2 has a wall surface that can come into contact with two of these side surfaces facing the inner peripheral side and the rear end side of the tool body 1 when the cutting insert 3 is mounted on the insert mounting seat 2. , It is formed perpendicular to the bottom surface 2A.

Further, the tool body 1 is formed with a coolant hole 5 from the inner circumference of the mounting hole 1A, and the coolant hole 5 extends to the outer peripheral side of the tool body 1 and is each insert mounting seat as shown in FIG. It opens in the central portion of the bottom surface 2A of No. 2, and coolant such as compressed air and cutting fluid is supplied to the coolant hole 5 from the spindle side of the machine tool via the arbor or the like. In the present embodiment, the coolant hole 5 has a smaller diameter than the through hole 3B of the cutting insert 3.

On the other hand, on the tool rotation direction T side of the insert mounting seat 2, a tip pocket 1C recessed on the inner peripheral side of the rear end of the tool body 1 is formed. Further, a recess 6 recessed on the inner peripheral side of the rear end of the tool body 1 is further formed in the central portion of the tip pocket 1C, and the pressing member 4 of the present embodiment is inserted into the recess 6. It is said to be a wedge member.

A female screw portion 6A centered on a screw hole center line L extending toward the inner peripheral side of the rear end of the tool body 1 is formed on the bottom surface of the recess 6 facing the outer peripheral side of the tip of the tool body 1. As shown in FIG. 2, the center line L extends in a direction away from the bottom surface 2A of the insert mounting seat 2 toward the outer peripheral side of the tip of the tool body 1. Further, the inner wall surface 6B facing the side opposite to the tool rotation direction T of the recess 6 extends parallel to the screw hole center line L, and the side opposite to the tool rotation direction T of the recess 6 and the tip pocket 1C is It is open to the insert mounting seat 2.

In the inner wall surface 6B facing the side opposite to the tool rotation direction T of the recess 6, the central portion in the direction from the tip inner peripheral side to the rear end outer peripheral side of the tool body 1 is recessed in the tool rotation direction T side. It is formed in a semi-concave cylindrical surface shape centered on the screw hole center line L. Further, both ends in the above direction connected to the central portion are substantially 1/4 convex cylindrical surfaces having a smaller radius than the central portion, which is in contact with the semi-concave cylindrical surface in the central portion and is convex in the direction opposite to the tool rotation direction T. It is formed in a shape.

As shown in FIGS. 5 and 6, the pressing member 4 inserted into the recess 6 is formed with a screw hole 4C penetrating from the front end surface 4A to the rear end surface 4B of the pressing member 4. Further, the upper surface 4D of the pressing member 4 has a central portion formed in a semi-convex cylindrical surface shape coaxial with the screw hole 4C, and both end portions have a smaller radius than the central portion in contact with the semi-convex cylindrical surface in the central portion. It is formed in a substantially 1/4 concave cylindrical surface shape. As shown in FIG. 2, the upper surface 4D is formed on the inner wall surface 6B facing the side opposite to the tool rotation direction T of the recess 6 in a state where the screw hole 4C is coaxially arranged with the female screw portion 6A of the recess 6. It is possible to slide in the L direction of the screw hole center line.

Further, the bottom surface 4E of the pressing member 4 opposite to the upper surface 4D is the pressing surface in the present embodiment, and from the center line of the screw hole 4C as the pressing member 4 goes from the rear end surface 4B to the tip surface 4A. It is formed in a flat shape that is inclined so as to be separated. The inclination angle formed by the bottom surface 4E with respect to the center line of the screw hole 4C is equal to the inclination angle formed by the screw hole center line L with respect to the bottom surface 2A of the insert mounting seat 2, and as described above, the screw hole is formed. The bottom surface 2A of the insert mounting seat 2 and the pressing member 4 are arranged coaxially with the female screw portion 6A of the recess 6 and the upper surface 4D of the pressing member 4 is slidably contacted with the inner wall surface 6B of the recess 6. It is parallel to the bottom surface 4E of.

Further, male screw portions 7A and 7B at both ends of the clamp screw 7 are screwed into the screw holes 4C and the female screw portions 6A of the recess 6, respectively. The male screw portions 7A and 7B at both ends of these clamp screws 7 are different from each other in at least one of the screw twisting direction and pitch. Further, an engaging hole 7C that engages with a work tool such as a wrench is formed on the end surface of the clamp screw 7 that faces the opening of the recess 6 on the outer peripheral side of the tip of the tool body 1.

Furthermore, in the central portion of the bottom surface 4E of the pressing member 4, an annular concave groove 8A recessed from the bottom surface 4E and a substantially spherical convex portion 8B slightly protruding from the central portion of the concave groove 8A from the bottom surface 4E. And the concave portion 8C having a circular cross section, which is recessed from the bottom surface 4E again, is formed from the central portion of the convex portion 8B. The diameter of the hole 8D and the diameter of the convex portion 8B when viewed from the direction facing the bottom surface 4E of the portion protruding from the bottom surface 4E are smaller than the diameter of the through hole 3B of the cutting insert 3.

Then, from the recess 8C to the tip surface 4A of the pressing member 4, a hole 8D is formed in the present embodiment as shown in FIG. 9, and is opened to the tip surface 4A. In the present embodiment, the three holes 8D are formed radially in a direction perpendicularly intersecting the tip surface 4A of the pressing member 4 and in a direction diagonally intersecting the tip surface 4A on both outer sides thereof. These holes 8D have a constant diameter and are circular in cross section equal to each other, and the diameter of each of these holes 8D is smaller than the diameter of the recess 8C.

In order to press the cutting insert 3 with the pressing member 4 configured in this way and attach it to the insert mounting seat 2 detachably, first loosen the clamp screw 7 and attach the pressing member 4 to the tool rotation direction T of the recess 6. It is slid toward the outer peripheral side of the tip of the tool body 1 along the inner wall surface 6B facing the opposite side to widen the distance between the bottom surface 2A of the insert mounting seat 2 and the bottom surface 4E of the pressing member 4. Then, the flat surface 3C of the regular heptagonal surface facing the side opposite to the tool rotation direction T, which is the seating surface of the cutting insert 3, is brought into close contact with the bottom surface 4E, and the two side surfaces are in contact with the wall surface of the insert mounting seat 2. The cutting insert 3 is brought into contact with the insert mounting seat 2.

Next, the clamp screw 7 is screwed in, the pressing member 4 is slid toward the inner peripheral side of the rear end of the tool body 1 to bring the bottom surface 4E closer to the bottom surface 2A of the insert mounting seat 2, and the tool rotation direction T of the cutting insert 3 is set. The cutting insert 3 is attached to the insert mounting seat 2 by pressing the bottom surface 4E as the pressing surface of the pressing member 4 in close contact with the flat surface 3C of the regular heptagonal surface which is the facing rake surface. That is, in the present embodiment, the flat surface 3C of the regular heptagonal surface facing the tool rotation direction T of the cutting insert 3 is the pressed surface. At this time, the convex portion 8B protruding from the bottom surface 4E of the pressing member 4 is accommodated in the opening of the through hole 3B on the regular heptagonal surface side facing the tool rotation direction T of the cutting insert 3.

In the state where the cutting insert 3 is attached to the insert mounting seat 2, the coolant hole 5 of the tool body 1 communicates with the through hole 3B of the cutting insert 3, and the hole 8D of the pressing member 4 is cut through the recess 8C. It communicates with the through hole 3B of the insert 3. Therefore, in this state, when coolant such as compressed air or cutting fluid is supplied to the coolant hole 5 from the mounting hole 1A side of the tool body 1 from the spindle of the machine tool via the arbor or the like, the coolant is applied to the bottom surface 2A of the insert mounting seat 2. It flows from the opening into the through hole 3B of the cutting insert 3, and further ejects from the hole 8D through the recess 8C of the pressing member 4 toward the cutting edge 3A of the cutting insert 3 located on the outer periphery of the tip of the tool body 1. It is discharged.

As described above, in the cutting tool having the above-mentioned structure, the coolant supplied to the coolant hole 5 of the tool body 1 is ejected from the hole 8D through the through hole 3B of the cutting insert 3 and discharged. Thus, the cutting edge 3A of the cutting insert 3 can be cooled by the coolant ejected from the hole 8D, and the cutting insert 3 can be cooled from the inside by the coolant passing through the through hole 3B of the cutting insert 3. Therefore, it is possible to prevent the cutting heat from accumulating inside the cutting insert 3 even after long-term continuous cutting, and it is possible to prevent the cutting insert 3 from being distorted by such cutting heat. Become.

Further, in the present embodiment, the flat surface 3C of the two regular hexagonal surfaces of the cutting insert 3 around the opening of the through hole 3B and the opening of the bottom surface 2A and the recess 8C of the insert mounting seat 2 around the opening of the coolant hole 5. Since the bottom surface 4E of the pressing member 4 around the portion is in close contact with the bottom surface 4E in a flat shape, the coolant hole 5 and the through hole 3B are insert-mounted except for the coolant supply portion to the coolant hole 5 in the mounting hole 1A of the tool body 1. No opening is made except for the bottom surface 2A of the seat 2 and the flat surface 3C which is the seating surface of the cutting insert 3.

Similarly, the through hole 3B, the recess 8C, and the hole 8D also have a bottom surface 4E which is a pressing surface and a flat surface which is a pressed surface, except for a coolant discharge portion from the hole 8D on the tip surface 4A of the pressing member 4. It does not open except for 3C. Therefore, it is possible to prevent the coolant from being wasted without being used for cooling from the inside of the cutting insert 3 and cooling the cutting edge 3A, and it is possible to prevent the loss of the coolant and efficiently perform the cutting insert 3 and the cutting blade 3A. It is possible to cool the cutting edge 3A.

Further, in the present embodiment, the tool body 1 is formed with a recess 6 communicating with the insert mounting seat 2, and the pressing member 4 is a wedge member inserted into the recess 6. The pressing surface of the pressing member 4 that presses the cutting insert 3 in close contact with the flat surface 3C of the regular hexagonal surface facing the tool rotation direction T, which is the pressed surface of the cutting insert 3, is an inclination of the wedge member as the pressing member 4. Since the bottom surface 4E is flat, the through hole 3B of the cutting insert 3 and the recess 8C and the hole 8D of the pressing member 4 are flat with the bottom surface 4E except for the coolant discharge portion from the hole 8D as described above. It is easy not to open the surface other than the surface 3C, and the loss of coolant can be prevented more reliably.

Furthermore, in the present embodiment, the recess 8C is formed on the bottom surface 4E which is the pressing surface of the pressing member 4, and the coolant is dispersed from the recesses 8C into the plurality (three) holes 8D of the cutting insert 3. It is ejected to the cutting edge 3A of the above and discharged. Therefore, the coolant can be temporarily stored in the recess 8C and can be stably ejected. However, instead of forming such a recess 8C, the plurality of holes 8D may be opened in the bottom surface 4E of the pressing member 4 so as to directly communicate with the through holes 3B of the cutting insert 3.

Further, in the present embodiment, since the coolant is dispersed and ejected from the plurality of holes 8D in this way, the coolant is supplied to a wide range of cutting blades 3A even when performing face milling with a large cutting amount, for example. be able to. In this embodiment and the second and third embodiments described later, the hole 8D is formed in the pressing member 4 and the coolant that has passed through the through hole 3B of the cutting insert 3 is ejected and discharged. A groove is formed on the bottom surface 4E which is the pressing surface of the pressing member 4, and the coolant is discharged from a hole formed between the groove and the flat surface 3C which is the pressed surface of the cutting insert 3. May be good.

Further, in the present embodiment, a plurality of insert mounting seats 2 are formed on the outer periphery of the tip portion of the tool body 1 rotated around the axis O, and the cutting insert 3 is detachably attached to each insert mounting seat 2. The case where the present invention is applied to a replaceable milling tool has been described, but particularly in a cutting edge replaceable front milling cutter in which a plurality of insert mounting seats 2 are formed on a disk-shaped tool body 1 as in the present embodiment, pressing is performed. Even if the member 4 is a wedge member inserted into the recess 6 as described above, it is possible to suppress the rigidity of the tool body 1 from being impaired, so that the machining accuracy can be maintained.

In the present embodiment, a negative type cutting insert formed in a regular heptagonal plate shape is attached as the cutting insert 3, but a polygonal plate-shaped cutting insert other than the regular heptagon is detachably attached. Alternatively, a positive type cutting insert may be attached detachably.

Further, in the present embodiment, the upper surface 4D of the wedge member as the pressing member 4 is formed in a semi-convex cylindrical surface shape whose central portion is coaxial with the screw hole 4C, and both end portions are substantially smaller in radius than the central portion. It is formed in a 1/4 concave cylindrical surface, but for example, the pressing member 4 is a wedge member having a rectangular or trapezoidal cross section orthogonal to the center line of the screw hole 4C, and is in sliding contact with the inner surface of the recess 6. The upper surface and the side surface may be flat.

Furthermore, in the present embodiment, the case where the present invention is applied to the cutting edge exchange type turning tool (front milling cutter) is described as described above, but the present invention is applied to the cutting edge exchange type turning tool such as a cutting tool. Is also possible. Further, when the present invention is applied to a turning tool with a replaceable cutting edge in this way, the pressing member is not a wedge member as described above, but is pressed by a clamp screw screwed in from a direction facing the pressed surface of the cutting insert. It may be a pressing member such as a clamp piece that presses the surface.

When pressing the pressed surface of the cutting insert using such a clamp piece as a pressing member, the opening on the pressed surface side of the through hole of the cutting insert is not completely covered by the pressing surface of the clamp piece and opens to the outside. In such a case, a sheet member or the like may be interposed between the pressed surface of the cutting insert and the clamp piece to cover the opening of the through hole, and a hole or a groove may be formed in the sheet member or the like. ..

Next, FIG. 10 shows a second embodiment of the cutting tool with a replaceable cutting edge of the present invention, and FIGS. 11 and 12 are attached to the cutting tool with a replaceable tooth tip of the second embodiment. The second embodiment of the pressing member of the present invention is shown, and the same reference numerals are given to the parts to be supplied from the first embodiment shown in FIGS. 1 to 9.

The cutting tool with a replaceable cutting edge of the second embodiment is also a cutting tool with a replaceable cutting edge (front milling cutter), and the pressing member 4 which is a wedge member is different from that of the first embodiment. In the pressing member 4 of the first embodiment, a plurality of (three) holes 8D having a circular cross section extend radially from the recess 8C opening in the bottom surface 4E which is the pressing surface and open to the tip surface 4A of the pressing member 4. On the other hand, in the pressing member 4 of the second embodiment, as shown in FIGS. 10 to 12, one hole having a substantially rectangular cross section extending parallel to the bottom surface 4E when viewed from the direction facing the tip surface 4A. The portion 8E is formed so as to open from the concave groove 8A to the tip surface 4A.

In the second embodiment, the concave portion 8C recessed from the convex portion 8B is not formed on the bottom surface 4E of the pressing member 4, the concave groove 8A communicates with the through hole 3B of the cutting insert 3, and the coolant is a hole portion. It is supplied to 8E, ejected from the tip surface 4A, and discharged. In such a cutting tool with a replaceable cutting edge and a pressing member 4 of the second embodiment, the coolant is not radially dispersed and discharged as in the first embodiment, but is ejected straight along the hole 8E. Since it is discharged, the coolant can be concentrated on the cutting tool 3A.

Further, FIGS. 13 and 14 show the pressing member 4 of the third embodiment of the present invention. In the pressing member 4 of the third embodiment, as shown in FIG. 14, two holes 8F having a circular cross section extend apart from each other so as to draw a 1/2 arc of the same radius from the recess 8C. It is formed so as to approach and open to the tip surface 4A of the pressing member 4, respectively.

In the pressing member 4 of the third embodiment and the cutting tool with a replaceable cutting edge to which the pressing member 4 of the third embodiment is attached, the coolant flowing through the two holes 8F is the pressing member 4. Since the coolant is dispersed by colliding with each other when it is ejected from the tip surface 4A of the above, it is possible to supply the coolant to a wide range of cutting blades 3A as in the first embodiment.

1 Tool body 1A Mounting hole 2 Insert mounting seat 2A Bottom of insert mounting seat 2 3 Cutting insert 3A Cutting edge 3B Through hole 3C Flat surface (pressed surface, seating surface)
4 Pressing member 4C Screw hole 4E Bottom surface (pressing surface) of pressing member 4
5 Coolant hole 6 Recess 6A Female thread 7 Clamp screw 7A, 7B Male thread 8C Recess 8D-8F Hole O Axis of tool body 1 T Tool rotation direction

Claims (6)

A cutting tool with a replaceable cutting edge that can be detachably attached by pressing a cutting insert seated on the bottom surface of an insert mounting seat formed on the tool body by a pressing member having a pressing surface facing the bottom surface. ,
The cutting insert has a through hole formed through the cutting insert by opening into a seating surface seated on the bottom surface of the insert mounting seat and a pressed surface pressed by the pressing surface of the pressing member. With
A coolant hole is formed in the tool body so as to open at the bottom surface of the insert mounting seat and communicate with the through hole.
The pressing member is formed with a hole or groove that opens into the pressing surface and communicates with the through hole, and extends toward a cutting edge formed on the outer periphery of the pressed surface of the cutting insert. A cutting tool with a replaceable cutting edge. The coolant hole and the through hole are not opened except for the bottom surface of the insert mounting seat and the seating surface of the cutting insert, except for the coolant supply portion to the coolant hole.
The claim is characterized in that the through hole and the hole portion or the groove portion are not opened except for the pressing surface and the pressed surface except for the coolant discharging portion from the hole portion or the groove portion. The cutting tool with a replaceable cutting edge according to 1. According to claim 1 or 2, the tool body is formed with a recess communicating with the insert mounting seat, and the pressing member is a wedge member inserted into the recess. The described cutting tool with replaceable cutting edge. Claims 1 to 3, wherein a recess is formed on the pressing surface of the pressing member, and the hole or the groove extends from the recess toward the cutting edge of the cutting insert. The cutting tool with a replaceable cutting edge described in any one of them. A cutting tool with replaceable cutting edge, in which a plurality of the insert mounting seats are formed on the outer periphery of the tip of the tool body that is rotated around the axis, and the cutting insert is detachably attached to each of the insert mounting seats. The cutting tool with a replaceable cutting edge according to any one of claims 1 to 4, wherein the cutting tool is characterized by the above. A pressing member attached to the cutting tool with a replaceable cutting edge according to any one of claims 1 to 5.
A pressing member characterized in that a hole or groove extending toward the cutting edge of the cutting insert is formed by opening in the pressing surface.

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