JP5315749B2 - Insert detachable cutter - Google Patents

Description

  The present invention relates to an insert detachable cutter in which a cutting insert is detachably clamped and fixed to an insert mounting seat formed on a cutter body by an insert clamp wedge (hereinafter referred to as a clamp wedge).

In the insert detachable cutter using such a clamp wedge, for example, as described in Patent Documents 1 to 3, a clamp wedge inserted into a recess communicating with an insert mounting seat formed in the cutter body is used. The insert mounting is performed by the clamp surface of the clamp wedge which is inclined so that the distance from the wedge surface becomes smaller in the pushing direction by being pushed into the cutter body by pushing means such as a clamp screw along the wedge surface. The polygonal flat plate-shaped cutting insert seated on the seat is pressed against the insert mounting seat in the thickness direction to be clamped and fixed.
Japanese Patent Publication No. 1-444443 JP-A-1-295709 International Publication No. 2008/023361 Pamphlet

  By the way, in recent years, in such an insert detachable cutter, there has been a demand for so-called multi-blade increase in which the number of cutting blades provided in the cutter body is increased to improve the processing efficiency. There is also a tendency for the number of clamp wedges to fix them to increase. However, when increasing the number of blades of the cutter in this way, the distance between the adjacent insert mounting seats and the recesses must be limited, that is, the cutter body has a smaller spacing between these insert mounting seats and the recesses. The shape is cut out by.

  For this reason, it becomes difficult to secure the wall thickness of the cutter body around the insert mounting seat and especially the recess, and the clamp strength when the insert is clamped by pressing the clamp wedge is lowered, and in some cases the wall thickness is There is also a risk of causing deformation or damage to the portion where the diameter becomes small. Also, in order to prevent such a decrease in clamp strength, for example, when the size of the clamp wedge is increased, the recess for pushing it in will also increase, and the wall thickness with the cutter body will be further reduced. It is likely to be lowered or deformed or damaged.

  In particular, in the insert detachable cutters described in Patent Documents 2 and 3, the recess is opened on the bottom surface of the chip pocket formed on the cutter rotating direction side of the insert mounting seat in the cutter body rotated around the axis. This chip pocket is widened in the circumferential direction toward the outer periphery of the cutter body in order to discharge chips smoothly, but to ensure the thickness and strength of the cutter body around the recess. For example, if the circumferential width of the chip pocket is simply reduced, chip clogging occurs in the chip pocket, resulting in increased cutting resistance and degraded processing accuracy.

  The present invention has been made under such a background, and in the insert detachable cutter that clamps the insert with the clamp wedge as described above, the spacing between the insert mounting seat and the recess is not limited by the increase in the number of blades. It is an object of the present invention to provide an insert detachable cutter capable of improving the strength of the insert clamp by securing the strength and rigidity of the cutter body around the recess even in the case where it is not obtained.

In order to solve the above-described problems and achieve such an object, the present invention provides a cutter body that is configured to communicate a cutting insert seated on an insert mounting seat formed on the cutter body with the insert mounting seat. An insert detachable cutter that is detachably fixed by being clamped by a clamp surface of the insert clamp wedge by pushing the insert clamp wedge into the recess formed in the opening of the recess in the cutter body. In the section parallel to the clamp surface , the periphery of the portion is recessed in the direction in which the insert clamping wedge is pushed in the portion where the recess opens, and the direction of the push is increased toward both ends of the periphery of the opening. Is characterized in that it is formed in a concave shape that gradually protrudes to the opposite side.

Therefore, in such an insert detachable cutter, the direction of the insert clamp wedge is pushed around the opening of the recess in the cutter body in a section parallel to the clamp surface and the recess opens. And is formed in a concave shape that gradually protrudes to the opposite side of the pushing direction as it goes toward both ends of the periphery of the opening. Can be secured in the cutter body.

  For this reason, even if the distance between adjacent insert mounting seats and recesses is limited due to the increase in the number of cutters, the strength and rigidity of the cutter body can be secured around the recesses. The strength can be improved, and the cutter body can be prevented from being deformed or damaged by the pressing of the clamp wedge. Therefore, according to the insert detachable cutter having the above configuration, the cutting insert can be firmly held on the insert mounting seat, and efficient cutting by increasing the number of blades can be surely promoted.

Further, the recesses when open to the bottom surface of the chip pockets formed in the cutter rotational direction of the insert mount seat, thus whereas pushed out this bottom at both ends of definitive to the cross section, the recess is located In the portion, the bottom surface is relatively recessed in the pushing direction, and the capacity of the chip pocket is not reduced more than necessary.

  In particular, when the recess is open to the bottom surface of the chip pocket in this way, by making the periphery of the opening of the recess, that is, the bottom surface, a concave curved surface, while ensuring the rigidity and strength of the cutter body as described above. The chip pocket capacity can be further increased, and the chips generated by the cutting blade of the cutting insert can be discharged smoothly, resulting in increased cutting resistance due to chip clogging and biting of clogged chips. Deterioration of processing accuracy can be prevented.

  As described above, according to the present invention, even in a multi-blade insert detachable cutter, the thickness of the cutter body can be secured around the opening of the recess to improve the strength and rigidity. This can prevent deformation and damage of the cutter body and improve the clamping strength to hold the cutting insert firmly, so that it is possible to surely promote efficient cutting by increasing the number of blades. .

  1 to 8 show an embodiment of an insert detachable cutter according to the present invention. The insert detachable cutter according to the present embodiment has a cutter body 1 formed of a steel material or the like in a generally disc shape as shown in FIG. 1, and a rear end side in the central axis direction (upper side in FIG. 1) is a spindle of a machine tool. 1 and the tip side (lower side in FIG. 1) is a blade portion 3 whose diameter is larger than that of the mounting portion 2, and rotates in the cutter rotation direction T around the central axis. It is made to use for cutting of a work material.

An insert mounting seat 4 on which a cutting insert (not shown) is seated and fixed so as to cut out the blade portion 3 on the inner peripheral side of the rear end on the outer peripheral side of the blade portion 3, and the insert mounting seat 4 A plurality of chip pockets 5 and recesses 6 communicating with each other in the cutter rotation direction T side are formed at intervals in the circumferential direction for each set of the insert mounting seat 4, the chip pocket 5 and the recess 6. Of these, the clamp wedge 10 of the present embodiment is inserted into the recess 6 , and the cutting insert is pushed into the inner peripheral side of the rear end of the cutter body 1 by the clamp screw 11 having male screw portions formed at both ends. Is clamped by being pressed by the insert mounting seat 4.

  Here, the cutting insert attached to the insert detachable cutter of the present embodiment is formed in a flat plate shape having a regular polygon (for example, a regular heptagon) with a hard material such as cemented carbide, One regular polygonal surface is a rake surface and the other regular polygonal surface parallel to the regular polygonal surface is a seating surface for the insert mounting seat 4, and a cutting edge is formed on a side ridge portion of the rake surface. Yes. Further, this cutting insert is a holed insert in which a hole having a circular cross section is formed at the center of the rake face, and this rake face is a holed surface in the holed insert.

  The insert mounting seat 4 on which such an insert with a hole is seated rises from a flat bottom surface 4A facing the cutter rotation direction T, and from the side ridges on the inner peripheral side and the rear end side of the cutter body 1 of the bottom surface 4A. A pair of wall surfaces 4B are provided, and two side surfaces of the insert with a hole are brought into contact with these wall surfaces 4B so that the rake face is directed in the cutter rotation direction T and the seating surface is in close contact with the bottom face 4A. The insert with holes is seated. At this time, for example, when the insert detachable cutter is a face mill, one of the cutting blades is positioned on one plane perpendicular to the central axis.

  On the other hand, the chip pocket 5 is formed so as to expand toward the cutter rotation direction T side toward the outer peripheral side (upper side in FIG. 4) of the cutter body 1 as shown in FIG. 5 is opened at the center of the bottom surface 5A facing the outer peripheral side of the cutter body 1 so as to communicate with the insert mounting seat 4 side and at a distance from the peripheral surface of the cutter main body 1. It is formed to extend to the side.

  The recess 6 includes a bottom surface 6A located on the inner peripheral side of the rear end of the cutter body 1, and an inner wall surface 6B extending from the bottom surface 5A of the chip pocket 5 toward the inner surface of the rear end of the cutter body 1 toward the bottom surface 6A. And have. On the bottom surface 6A, a screw hole 6C into which the male screw portion on one end side of the clamp screw 11 is screwed is directed toward the bottom surface 4A side of the insert mounting seat 4 toward the inner peripheral side of the rear end of the cutter body 1 and a pair of screws 6C. The wall surface 4B is formed so as to extend in the intersecting direction, and the inner wall surface 6B is formed so as to extend in parallel to the center line of the screw hole 6C, and the inside (rear side) of the cutter body 1 along the center line. The direction toward the end inner peripheral side is the pushing direction of the clamp wedge 10 in the present embodiment.

  As shown in FIGS. 5 and 6, the wedge main body 12 of the clamp wedge 10 inserted and pushed into the recess 6 is formed into a hollow piece shape by a steel material or the like. The hollow portion is a screw hole 13 into which the male screw portion on the other end side of the clamp screw 11 is screwed, and the wedge main body 12 has one end face 12A on the outer peripheral side (front side) of the cutter main body 1. ) And the other end face 12B is made to face the bottom face 6A of the recess 6 and is inserted into the recess 6, and the male screw portions at both ends are screwed into the screw hole 13 and the screw hole 6C, respectively. By screwing the clamp screw 11 that has been moved, it is pushed into the recess 6 toward the inner peripheral side of the rear end of the cutter body 1. Therefore, in the clamp wedge 10, the direction from the end surface 12A toward the end surface 12B along the center line C of the screw hole 13 is the pushing direction.

  Further, one of the side surfaces extending between the both end surfaces 12A and 12B of the wedge main body 12 is the above-described rake face of the insert with a hole facing the insert mounting seat 4 when the clamp wedge 10 is pushed into the recess 6. In this embodiment, a protrusion 15 is formed at the center of the clamp surface 14. Here, a concave groove portion 14A that is slightly recessed from the clamp surface 14 is formed at a boundary portion between the protrusion 15 and the clamp surface 14, and in this embodiment, the clamp surface 14 includes the protrusion 15 and the concave groove portion. The entire surface except for 14A is at an angle equal to the inclination angle formed by the center line of the screw hole 6C with respect to the bottom surface 4A of the insert mounting seat 4 with respect to the center line C of the screw hole 13 toward the end face 12A side. It is formed in an inclined plane shape that approaches, and is formed so as to surround the protrusion 15 and the groove 14A.

  Further, in the present embodiment, the protrusion 15 has a spherical surface, and the cross section along the clamp surface 14 and the cross section parallel to the clamp surface 14 are both circular. . However, as shown in FIG. 6, the protruding height from the clamp surface 14 is sufficiently smaller than the radius of the circle formed by the protrusion 15 in the cross section along the clamp surface 14, and the radius of the circle in this cross section Is made smaller than the radius of the circle formed by the opening to the rake face of the hole formed in the hole insert, and the clamp wedge 10 is pushed into the recess 6 so that the clamp surface 14 is the above hole of the hole insert. When closely attached to the attachment surface, the protrusion 15 is accommodated in the hole.

  On the other hand, the side surface of the wedge main body 12 facing away from the clamp surface 14 is a wedge surface 16 that slides on the inner wall surface 6B when the clamp wedge 10 is pushed into the recess 6. The cross section perpendicular to the center line C, that is, the cross section perpendicular to the pushing direction extends between the both end faces 12A and 12B in parallel with the center line C. A side surface perpendicular to the clamp surface 14 is formed between the wedge surface 16 and the clamp surface 14 in parallel to the center line C, and the clamp surface 14 is inclined with respect to the center line C. The side surface portion gradually becomes narrower toward the end surface 12B side.

  In addition, the wedge surface 16 includes a convex curved portion 16A that forms a semicircular (1/2 arc) convex curve centered on the center line C in a cross section perpendicular to the pushing direction, and the convex curved portion 16A. As the concave surface such as a concave arc smoothly contacting the convex curved portion 16A from both ends toward the clamp surface 14 side, the direction in which the clamp surface 14 extends in the cross section (the vertical direction in FIG. 6A, (c ) And a concave curved surface portion 16B extending to the side surface portion. Therefore, in this embodiment, the shape orthogonal to the pushing direction of the wedge main body 12 forms a bell shape as shown in FIG.

  When the clamp wedge 10 is pushed in, the cross-sectional shape of the inner wall surface 6B of the recess 6 with which the wedge surface 16 is slidably contacted is the center line of the screw hole 6C opposite to the cross-sectional shape of the wedge surface 16. The insert mounting seat 6 forms a concave curved portion having a semicircular arc (1/2 circular arc) -shaped concave curve at the center, and a convex curve such as a convex arc smoothly contacting the concave curved portion from both ends of the concave curved portion. It is formed from the convex curve part which spreads toward the side.

The bottom surface 5A of the chip pocket 5 of the cutter body 1 which is the periphery of the opening where the recess 6 opens is the recess 6 in a cross section perpendicular to the pushing direction, that is, a cross section perpendicular to the center line of the screw hole 6C. The direction of pushing in as it goes toward both ends in the direction in which the clamp surface 14 of the clamp wedge 10 to be pushed into is extended, that is, in the same cross section, in the direction in which the bottom surface 4A of the insert mounting seat 4 extends (vertical direction in FIGS. Is formed in a concave shape that gradually protrudes to the opposite side (the front side of the drawing in FIGS. 3 and 8). That is, the periphery of the opening of the recess 6 is recessed in the push-in direction at the portion where the recess 6 opens in a cross section parallel to the clamp surface 14 and as it goes toward both ends of the periphery of the opening. The concave surface is formed so as to gradually protrude to the side opposite to the pushing direction.

In particular, in the present embodiment, the concave surface formed by the bottom surface 5A is a concave curved surface, that is, the bottom surface 5A is also in a cross section orthogonal to the bottom surface 4A of the insert mounting seat 4 including the center line of the screw hole 6C. , with and without a concave curve recessed have recesses 6 side, toward the both end sides of the bottom surface 4A in a direction perpendicular to the plane formed by the the cross section, i.e. the rear outer peripheral side and the front end inner peripheral side of the cutter body 1 It is formed so as to protrude gradually toward the outer peripheral side of the front end of the cutter main body 1 while forming a concave curved surface, and to be continuous with the peripheral surface of the cutter main body 1.

  In order to attach the insert with a hole to the insert detachable cutter configured as described above, first, the wedge surface 16 is slidably contacted with the inner wall surface 6B, the clamp wedge 10 is inserted into the recess 6, and the screw hole of the wedge main body 12 is inserted. 13 and the screw hole 6 </ b> C of the recess 6 are screwed together to temporarily fix the clamp wedge 10 to the cutter body 1. Next, after the holed insert is seated on the insert mounting seat 4 as described above, when the clamp screw 11 is further screwed and the clamp wedge 10 is pushed into the recess 6, the projection 15 of the clamp wedge 10 has a hole. While being accommodated in the hole of the insert, the clamp surface 14 comes into close contact with the holed surface and presses against the bottom surface 4A side of the insert mounting seat 4, whereby the holed insert is clamped and fixed. At this time, the protrusion 15 may be brought into contact with the peripheral edge of the opening of the hole and the insert with a hole may be drawn in the direction in which the pair of wall surfaces 4B intersect.

Thus, in the insert detachable cutter having the above configuration, the bottom surface 5A of the chip pocket 5 which is the periphery of the opening portion where the recess 6 of the cutter body 1 opens is parallel to the clamp surface 14 as described above. In the cross section, the bottom of the recess 6 is recessed in the push-in direction, and is formed in a concave shape that gradually protrudes to the opposite side of the push-in direction toward the both ends of the bottom surface 5A. At a portion where 5A and the peripheral surface of the cutter body 1 intersect, a large thickness can be ensured on the inner peripheral side of the front end and the outer peripheral side of the rear end of the cutter main body 1, which is both ends of the cross section .

  For this reason, even if the insert detachable cutter has to be limited to a small distance between the set of the insert mounting seat 4, the tip pocket 5 and the recess 6 due to the increase in the number of blades, in the periphery of the recess 6. Since a large thickness can be secured in the cutter body 1, the strength and rigidity of the cutter body 1 can be increased, and the cutting insert can be held stably and firmly. Damage can also be prevented, and it is possible to surely promote improvement in cutting efficiency by increasing the number of blades.

In this embodiment, the recess 6 opens to the bottom surface 5A of the chip pocket 5 formed on the cutter mounting direction T side of the insert mounting seat 4, and the bottom surface 5A is a cross section parallel to the clamp surface 14. In contrast , the bottom surface 5A is relatively recessed in the pushing direction at the center side, that is, in the portion where the recess 6 of the bottom surface 5A is opened. For this reason, the capacity | capacitance of the chip pocket 5 does not become unnecessarily small, and smooth chip discharge | emission can be aimed at.

  Here, the concave surface formed by the bottom surface 5A of the chip pocket 5 is such that, for example, the cross section perpendicular to the plane perpendicular to the bottom surface 4A of the insert mounting seat 4 is V-shaped including the center line of the screw hole 6C. However, in this embodiment, in the same cross section, in the same cross section, the concave 6 side is the most concave concave curve, and both ends in the direction in which the clamp surface 14 extends, that is, the outer peripheral side of the rear end of the cutter main body 1. A concave curved surface is formed so as to gradually protrude toward the inner peripheral side of the tip.

  For this reason, since the capacity | capacitance of the chip pocket 5 can be ensured still larger compared with the case where it is formed in the cross-sectional V shape as mentioned above, according to this embodiment, it produces | generates with the cutting blade of the cutting insert. It is possible to securely store the discharged chips in the chip pocket 5 and discharge them, and an increase in cutting resistance due to chip clogging hinders efficient processing as described above, or clogged chips are separated from the work material. It is possible to prevent a situation in which the machining accuracy is deteriorated by being bitten between the two and damaging the machining surface.

  Further, in the present embodiment, in the clamp wedge 10 for clamping the insert with a hole, the cross-sectional shape perpendicular to the pushing direction of the wedge main body 12 is a convex shape having a semicircular arc shape on the wedge surface 16 side opposite to the clamp surface 14. It has a bell-shaped shape composed of a curved convex part 16A and a pair of concave curved parts 16B that are wide from both ends to form a concave curve, whereby the wedge main body 12 and the cutter into which it is pushed. Without increasing the cross-sectional area perpendicular to the pushing direction of the recess 6 of the main body 1 more than necessary, the clamping surface 14 can be widened to secure its area.

  Therefore, the cutting insert can be clamped in a wider area, and the thickness between the inner wall surface 6B of the recess 6 and the surface of the cutter body 1 is increased to increase the mounting rigidity of the clamp wedge 10 itself. Accordingly, it is possible to further improve the clamping strength of the insert with a hole and to achieve stable cutting with higher accuracy. Moreover, since the cross-sectional area of the recess 6 does not become larger than necessary, it is possible to reliably cope with the increase in the number of blades of the cutter body 1.

  In particular, in this embodiment, as described above, the convex curved portion 16A to the concave curved portions 16B at both ends thereof are the wedge surfaces 16, that is, the concave curved portion 16B is also pushed in from the end surface 12A of the wedge main body 12 in the pushing direction. It is inclined so that the distance from the clamp surface 14 becomes gradually smaller toward the end surface 12B. Accordingly, it is possible to reliably apply the pressing force to both side portions of the clamp surface 14 which is wide on the back side of the concave curved portion 16B, and thereby it is possible to clamp and fix the cutting insert more firmly.

  On the other hand, in the clamp wedge 10 of this embodiment, the projection 15 accommodated in the hole of the insert with a hole is formed on the clamp surface 14, and the cutting edge is worn by using the clamped insert with the hole. When the corner of the insert is changed, the clamp screw 11 is slightly loosened to release the press of the insert with the hole, and the clamp 15 is held within the range in which the projection 15 is accommodated in the hole and maintained in the engaged state. The wedge 10 and the insert with a hole are pulled out and shifted to the rear side in the pushing direction, so that the insert with the hole is engaged with the protrusion 5 and the protrusion 15 is prevented from falling off from the insert mounting seat 4. It can be made rotatable around the center.

  Therefore, in this state, by rotating the insert with a hole so that the next cutting blade to be used is oriented in a predetermined direction, and re-sitting on the insert mounting seat 4, and screwing and clamping the clamp screw 11 again, for example, Even if the insert detachable cutter is a face mill or the like and the insert mounting seat 4 is faced down and attached to the main spindle of the machine tool, the insert with holes can be prevented from falling and the corner change work can be performed. . For this reason, it is not necessary for the operator to hold the insert by hand to prevent dropping, or to remove the cutter body 1 from the main shaft and perform the operation. Even if the number of inserts and clamp wedges 10 is large, it is possible to finish the corner change work in a short time and easily and continue the cutting process quickly, thereby reducing the overall machining time and improving the efficiency. Economic efficiency can be improved.

  Further, in the present embodiment, the protrusion 15 has a spherical shape and is not easily crushed even if the corner change is repeated, and the clamp wedge 10 is retracted along the inner wall surface 6B of the recess 6 as described above to insert the clamp surface 14 and the insert. The gap between the hole and the projection can be increased by making a slight gap between the surface with the hole and the insert can be easily rotated, and the corner change operation can be further simplified.

  However, as the protrusion 15, when the clamp wedge 10 and the insert with a hole are pulled out in the pushing direction rearward within a range in which the protrusion 15 is accommodated in the hole and engaged as described above, However, the shape may be any shape as long as it is rotatable around the protrusion 15 and can be corner-changed. For example, the shape may be a cone shape or a truncated cone shape. Further, the insert with a hole may not be a regular polygonal flat plate as long as a plurality of cutting edges that are corner-changed at the side ridge portion of the perforated surface are formed. It may be an insert. Furthermore, the hole of the insert with a hole may be a through hole penetrating from the perforated surface to the opposite surface, or may be a blind hole that does not penetrate.

  By the way, in the clamp wedge 10 of the present embodiment, the protrusion 15 is formed so that the periphery of the protrusion 15 is surrounded by the clamp surface 14 via the concave groove portion 14A. Like the clamp wedge 20 of the modified example of the embodiment, it may be formed so as to extend to the edge of the clamp surface 14 and open to this edge. In addition, also in the modified example shown in FIG. 9 and other modified examples shown in FIG. 10 to be described later, the same reference numerals are assigned to portions common to the clamp wedge 10 of the above embodiment, and the description thereof is omitted.

  Accordingly, when the concave groove portion 14A is formed as in the modification shown in FIG. 9, the clamp surface 14 is U-shaped as shown in FIG. A finishing tool such as a finishing end mill or a grinding tool can be finished only by sending it once along the U-shape so that the trajectories do not overlap. That is, since the finishing surfaces do not overlap each other at the portion where the finishing tool is cut into the clamping surface 14 and the portion away from the clamping surface 14, a minute step is generated between the finishing surfaces at the overlapping portion. Therefore, the clamping surface 14 can be securely adhered to the perforated surface of the insert with a hole.

  However, in the insert detachable cutter according to the present invention, the projection surface 15 and the concave groove portion 14A are not formed on the clamp surface 14, and the clamp surface 14 is formed like the clamp wedge 30 of another modification shown in FIG. The whole may be a flat surface in which the distance from the wedge surface 16 becomes smaller in the pushing direction. According to such a clamp wedge 30, it is possible to further increase the contact area between the clamp surface 14 and the cutting insert to achieve stable clamping, and it is also possible to clamp a cutting insert without a hole without a hole. it can.

It is the perspective view seen from the front-end | tip outer peripheral side of the cutter main body 1 which shows one Embodiment of the insert detachable cutter of this invention. It is the expansion perspective view which looked at the front-end | tip outer peripheral part of the cutter main body 1 of embodiment shown in FIG. 1 from the front end side. It is the enlarged view which looked at the insert mounting seat 4, the chip pocket 5, and the recess 6 periphery of embodiment shown in FIG. 1 in the centerline direction of the screw hole 6C. FIG. 2 is an enlarged view of the periphery of the insert mounting seat 4, the tip pocket 5, and the recess 6 of the embodiment shown in FIG. 1 viewed from a direction parallel to the bottom surface 4A of the insert mounting seat 4 and perpendicular to the center line of the screw hole 6C. . It is a perspective view which shows the clamp wedge 10 of embodiment shown in FIG. The clamp wedge 10 shown in FIG. 5 is (a) a view seen from the end face 12A along the center line C of the screw hole 13, and (b) a view seen from a direction parallel to the clamp face 14 and perpendicular to the center line C. (C) It is the figure seen from the direction which opposes the clamp surface 14 at right angles to the centerline C. FIG. It is a figure which shows the state which inserted the clamp wedge 10 in the recess 6 shown in FIG. It is a figure which shows the state which inserted the clamp wedge 10 in the recess 6 shown in FIG. 1A is a view of the clamp wedge 20 of the modification of the embodiment shown in FIG. 1 as viewed from the end surface 12A side along the center line C of the screw hole 13, and FIG. 1B is parallel to the clamp surface 14 and perpendicular to the center line C. The figure seen from a direction, (c) It is the figure seen from the direction which opposes the clamp surface 14 perpendicularly to the centerline C. It is a perspective view which shows the clamp wedge 30 of the other modification of embodiment shown in FIG.

Explanation of symbols

1 Cutter body 4 Insert mounting seat 5 Chip pocket 5A Bottom surface of chip pocket 5 (around opening of recess 6)
6 recess 6A bottom surface of recess 6B inner wall surface of recess 6 screw hole 10, 20, 30 clamp wedge (insert clamp wedge)
DESCRIPTION OF SYMBOLS 11 Clamp screw 12 Wedge body 13 Screw hole 14 Clamp surface 14A Concave groove part 15 Protrusion 16 Wedge surface 16A Convex part of wedge surface 16 B Concave part of wedge surface 16 C Centerline of screw hole 13 T Rotation direction of cutter body 1

Claims (3)

By inserting the insert clamp wedge into the recess formed in the cutter body so that the cutting insert seated on the insert mount seat formed in the cutter body communicates with the insert mount seat, the insert clamp wedge is inserted. An insert detachable cutter that is detachably clamped and clamped by a clamping surface of the cutter, wherein the periphery of the opening of the recess in the cutter body is a portion where the recess opens in a cross section parallel to the clamping surface The insert clamp wedge is recessed in the push-in direction, and is formed in a concave shape that gradually protrudes to the opposite side to the push-in direction as it goes toward both ends of the periphery of the opening. Cutter.   2. The insert detachable cutter according to claim 1, wherein the recess is opened in a bottom surface of a chip pocket formed on a cutter rotation direction side of the insert mounting seat. 3.   The insert detachable cutter according to claim 1 or 2, wherein a periphery of the opening of the recess is a concave curved surface.

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