JP2019098434A - Edge-replacing type cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely mount a cutting insert even when many insert mounting portions are formed without rotating a wrench in the reverse direction or having a handle too close to the insert mounting portion. SOLUTION: An insert mounting seat 3 and a slit 4 are formed in a plurality of insert mounting portions 2 formed on an outer peripheral portion of a cutter main body 1, and a lower jaw portion 2B is formed on a side where a seating surface 3B is formed with the slit 4 in between. The side on which the pressing surface 3A is formed is the upper jaw portion 2A, and the locking portion 5A to which one pin 23 of the wrench main body 21 is locked and the other pin 22 are in sliding contact with the cutter main body 1. The arcuate surface 5B whose distance from the locking portion 5A decreases from one end to the other end is formed as a pair, and one of the paired locking portion 5A and the arcuate surface 5B is formed on the maxillary portion 2A. The other is formed on the insert mounting portion 2 other than the insert mounting portion 2 having the maxillary portion 2A to be elastically deformed. [Selection diagram] FIG. 5

Description

  In the present invention, a plurality of insert attachment portions on which a cutting insert having a cutting edge is detachably attached to the outer peripheral portion of a disk-like cutter body are formed at intervals in the circumferential direction of the cutter body. The present invention relates to an indexable cutter that is used to cut a slit or to form a slit in a workpiece.

  As such an indexable cutter, for example, according to Patent Document 1, a plurality of insert attachment portions to which a cutting insert having a cutting edge is detachably attached to an outer peripheral portion of a disk-shaped cutter main body is circumferentially The insert mounting portions are elastically deformable in the direction away from the lower jaw and the lower jaw by an insert mounting seat and a slit that penetrates the cutter body in the axial direction of the cutter body. The upper jaw is formed, and thus the upper jaw is elastically deformed in a direction away from the lower jaw, and then the cutting insert is sandwiched between the upper jaw and the lower jaw. What is attached is described.

  Further, in Patent Document 2, although not an indexable cutter, an insert mounting seat is formed at the front end of a plate-like holder main body, and a slit is formed on the rear end side of the insert mounting seat. In the holder for indexable cutting tools, an elongated hole having a long axis in the extending direction of the slit is formed. In this blade-tip-replaceable tool holder, a pin with an elongated circular cross section of a wrench is inserted into the elongated hole so that the major axis is along the long axis direction of the elongated hole, and the wrench is rotated to make the pin cross section. By orienting the major axis of the oval in the minor axis direction of the elongated hole, the edge portion of the pin facing the major axis direction is brought into sliding contact with the inner surfaces facing each other in the minor axis direction of the elongated hole to press the upper jaw. The indexable cutter described in Patent Document 1 elastically deforms the upper jaw by the same means as the elastic deformation so as to be separated from the lower jaw.

  Furthermore, Patent Documents 3 to 5 also disclose a holder for a cutting edge-replaceable cutting tool in which the upper jaw is elastically deformed to be separated from the lower jaw by a wrench in which two pins project. There is. Here, in the holder for indexable cutting tools described in Patent Document 3, a cylindrical hole into which one of the two pins of the wrench is inserted is formed in the upper jaw portion, and the other is formed in the lower jaw portion. In the holder for indexable cutting tools described in Patent Document 4, a hole is formed in the lower jaw and a pin insertion groove having a circular arc shape and a slit. It is done. Moreover, in the blade-tip-replaceable tool holder described in Patent Document 5, not the hole but an arc-shaped recessed portion is formed in the upper jaw portion, and the arc-shaped groove is formed in the lower jaw portion.

  In the blade-tip-replaceable tool holder described in these patent documents 3 to 5, the inner wall surface of the groove facing the hole or recess is formed so that the distance to the center of the hole or recess gradually decreases toward the tip end. By sliding one of the two pins of the wrench to the inner surface of the hole or recess and sliding the other pin to the inner wall of the groove while rotating the wrench toward the tip The upper jaw is pushed up and elastically deformed so as to be separated from the lower jaw.

European Patent Application Publication No. 3153263 Japanese Patent Publication No. 9-505003 Japanese Patent Application Publication No. 2001-517555 JP 2000-343304 A JP, 2017-136670, A

  However, according to the means described in Patent Document 2, when the major axis of the oval formed by the cross section of the wrench pin is directed in the direction of the minor axis of the elongated hole, the wrench rotates clockwise around the center line of the elongated hole. It can also rotate in the counterclockwise direction. Therefore, when the upper jaw is elastically deformed and the cutting insert is seated on the insert mounting seat and then the wrench is returned to the original position and the cutting insert is attached, the wrench may be erroneously rotated in the reverse direction. There is.

  Therefore, in an indexable cutter such as that described in Patent Document 1 using such means, especially when the number of inserts is increased in order to increase the number of inserts, if the distance between adjacent insert attachment parts is decreased, When the wrench is accidentally rotated in the reverse direction and the handle (handle) of the wrench gets too close to the adjacent insert mounting portion, the operator's hand touches the adjacent insert mounting portion or the insert mounting portion. There is a risk of hitting a cutting insert already attached to the

  On the other hand, in the blade-tip-replaceable tool holder described in Patent Documents 3 to 5, in the means for elastically deforming the upper jaw, the rotation direction of the wrench is determined by the groove and the rotation range is also limited by the groove. By applying the means to the indexable cutter, the wrench is not inadvertently rotated in the reverse direction, and the handle of the wrench is not too close to the adjacent insert mount.

  However, in such an indexable cutter, if the number of inserts is increased in order to increase the number of blades as described above, the individual insert attachment parts become smaller, so a hole is formed in one insert attachment part. It becomes difficult to form the recess and the groove together. Further, even if formed, since the distance between the hole or recess and the groove becomes small, the upper jaw can not be elastically deformed to a necessary size, and there is a possibility that the cutting insert can not be attached reliably. .

  The present invention has been made under such a background, and erroneously rotating the wrench in the reverse direction or putting the handle of the wrench too close to the adjacent insert mounting portion during the removal operation of the cutting insert. Even if many insert mounting parts are formed on the outer peripheral part of the cutter main body in order to increase the number of blades, the upper jaw can be elastically deformed to the required size, and the cutting insert can be made with a strong elastic force. An object of the present invention is to provide an indexable cutter which can be securely attached.

  In order to solve the above problems and achieve such an object, the present invention detachably attaches a cutting insert having a cutting edge to an outer peripheral portion of a disc-like cutter body rotated about an axis. A plurality of insert mounting portions formed at intervals in the circumferential direction of the cutter body, and the insert mounting portion includes an insert mounting seat which penetrates the cutter body in the axial direction and opens at the outer periphery of the cutter body And a slit extending to the inner peripheral side of the cutter body in communication with the inner peripheral portion of the insert mounting seat, of the two inner side surfaces of the insert mounting seat facing each other with the slit interposed therebetween One of the inner side surfaces is a seating surface on which the cutting insert is seated, and the other inner side surface is a pressing surface for pressing the cutting insert toward the seating surface. Of the insert attachment portion, the side on which the seating surface is formed is a lower jaw, and the side on which the pressing surface is formed is an upper jaw that can be elastically deformed in a direction away from the lower jaw. The cutter main body includes a locking portion to which one of the two pins projecting in parallel from one side of the wrench main body of the wrench elastically deforming the upper jaw, and the other pin Are in sliding contact with each other and an arc-shaped surface in which the distance from the one end to the other end decreases with distance from one end to the other, in the same number as the number of the insert mounting portions. One of the stop portion and the arcuate surface is formed on the upper jaw of the insert mounting portion to be elastically deformed, and the other is formed on another insert mounting portion other than the insert mounting portion having the upper jaw to be elastically deformed. It is characterized in that is.

  In the indexable cutter configured as described above, the upper jaw is elastically deformed by the wrench in which the two pins protrude from the wrench main body. That is, the space between the locking portion such as a hole or a recess where one of the pins is locked and the other pin is in sliding contact with the other pin and moves from one end to the other end. The arced surface is formed in pairs equal to the number of insert mounting portions, and the other pin may be positioned at one end or the other end of the arced surface and rotated toward the opposite end. The insert does not accidentally turn the wrench in the reverse direction when attaching or detaching the cutting insert, and even when many insert mounting parts are formed on the outer peripheral part of the cutter body, the insert with the handle of the wrench adjacent It does not get too close to the mounting part.

  And while being formed in the upper jaw of the insert attaching part which carries out elastic deformation among these locking parts which make a pair, and an arc side, the other is other than the insert attaching part which has the upper jaw which makes this elastic deformation. Since it is formed in the insert mounting portion, even if the individual insert mounting portions become smaller by forming many insert mounting portions in the cutter body as described above, the pair of the locking portion and the arcuate surface The gap between the upper and lower jaws can be elastically deformed to a required size. Therefore, since the cutting insert can be pressed with sufficient elastic force and attached to the insert mounting seat, it is possible to perform stable cutting with high accuracy.

  Here, the one of the locking portion and the arc-shaped surface forming the pair may be formed in the slit of the insert attaching portion that elastically deforms the upper jaw. For example, if an arc-shaped surface is formed as a slit, the slit itself can be made a groove in which this arc-shaped surface is formed, and by forming such a groove, the cutaway portion of the insert attachment portion can be eliminated. This enables the rigidity of the insert mounting portion to be improved. In addition, when forming a latching | locking part in a slit, this latching | locking part becomes a recessed part.

  In addition, the locking portion and the arc-shaped surface forming the pair may be formed in the insert mounting portion adjacent in the circumferential direction of the cutter main body. Thereby, it is possible to prevent the gap between the locking portion and the arced surface from becoming larger than necessary, and perform the mounting and demounting operation of the cutting insert without using a long wrench, in which the gap between the two pins is larger than necessary. Is possible.

  As described above, according to the present invention, a large number of insert mountings are performed to increase the number of blades without rotating the wrench in the reverse direction or without the wrench handle coming too close to the adjacent insert mounting portion. Even when the part is formed on the outer peripheral part of the cutter main body, it is possible to press the cutting insert with a sufficient elastic force by elastically deforming the upper jaw part with a necessary size, and attach it to the insert mounting seat. It is possible to perform stable cutting with accuracy.

It is a perspective view which shows the 1st Embodiment of this invention. Figure 2 is a side view of the embodiment shown in Figure 1; Figure 2 is a side view of the embodiment shown in Figure 1; In embodiment shown in FIG. 1, in order to elastically deform an upper jaw part, it is a perspective view which shows the state which inserted the pin of the wrench in the latching | locking part and the slit. It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view which shows the state which rotated the wrench and elastically deformed the upper jaw part from the state shown in FIG. It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view which shows the 2nd Embodiment of this invention. Figure 11 is a side view of the embodiment shown in Figure 10; Figure 11 is a side view of the embodiment shown in Figure 10; FIG. 11 is a perspective view showing a state in which a pin of a wrench is inserted into a locking portion and a slit in order to elastically deform the upper jaw in the embodiment shown in FIG. 10. It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view which shows the state which rotated the wrench and elastically deformed the upper jaw from the state shown in FIG. It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view which shows the 3rd Embodiment of this invention. FIG. 20 is a side view of the embodiment shown in FIG. 19; FIG. 20 is a side view of the embodiment shown in FIG. 19; FIG. 21 is a perspective view showing a state in which a pin of a wrench is inserted into a groove between the locking portion and the adjacent insert mounting portion in order to elastically deform the upper jaw in the embodiment shown in FIG. 19; It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view which shows the state which rotated the wrench and elastically deformed the upper jaw part from the state shown in FIG. It is a side view of the state shown in FIG. It is a front view of the state shown in FIG. It is a perspective view of the wrench used for attachment or detachment operation of cutting insert in the 1st thru / or 3rd embodiment. It is a side view of the wrench shown in FIG. It is a front view of the wrench shown in FIG.

  FIGS. 1 to 9 show a first embodiment of the present invention, FIGS. 10 to 18 show a second embodiment of the present invention, and FIGS. 19 to 27 show a second embodiment of the present invention. 7 shows an embodiment 3; In the first to third embodiments, the same reference numerals are assigned to parts common to each other. Further, FIGS. 28 to 30 show a wrench used for the attaching and detaching operation of the cutting insert in the first to third embodiments.

  In these embodiments, the cutter main body 1 is formed in a thin, generally circular disk shape centering on the axis O by an elastically deformable metal material such as steel material, and the cutter main body 1 is machined at the central portion thereof. A mounting hole 1A with a key groove having an axis O for mounting on the main shaft of the machine is formed to penetrate the cutter main body 1, and a plurality of (four) small diameter holes are formed around the mounting hole 1A. 1B is formed so as to penetrate the cutter main body 1 at equal intervals in the circumferential direction.

  Such a cutter main body 1 is a cutting insert described later in a plurality of (10 in the first to third embodiments) insert mounting portions 2 formed at equal intervals in the circumferential direction on the outer peripheral portion thereof. After I is attached, the keyed shaft of the spindle end of the machine tool is inserted through the mounting hole 1A, and the mounting bolt inserted through the small diameter hole 1B is screwed into the end face around the keyed shaft of the spindle Can be attached to the spindle of the machine tool. Then, while being rotated in the cutter rotational direction T about the axis O by the main shaft, relative feed is given between the work material in the direction perpendicular to the axis O, and the cutting edge of the cutting insert I It performs cutting such as cutting of a work material and slit formation.

  In each of the insert mounting portions 2, an insert mounting seat 3 opened on the outer periphery of the cutter main body 1 is formed to penetrate in the thickness direction of the insert mounting portion 2 same as the axis O direction of the cutter main body 1. The insert mounting seat 3 is slightly inclined toward the opposite side of the cutter rotational direction T as it goes to the inner peripheral side of the cutter body 1. Further, a slit 4 communicating with the insert mounting seat 3 and extending further to the inner peripheral side of the cutter main body 1 is formed at the rear end portion of the insert mounting seat 3.

  Accordingly, in the insert mounting seat 3, two inner side surfaces opposed to each other in the circumferential direction of the cutter body 1 with the slit 4 interposed therebetween are formed, and of these, it faces the opposite side to the cutter rotational direction T. The inner surface is a pressing surface 3A for pressing the cutting insert I, and the inner surface facing the cutter rotational direction T is a seating surface 3B on which the cutting insert I is seated. The pressing surface 3A and the seating surface 3B extend substantially in parallel with each other as shown in FIGS. 2, 11, and 20 when the cutting insert I is removed, and the pressing surface 3A and the seating surface 3B In the cross section orthogonal to the extending direction, it is formed in a convex V shape.

  Further, the inner peripheral portion of the insert mounting seat 3 between the pressing surface 3A and the seating surface 3B intersects the pressing surface 3A in an obtuse angle, and intersects the seating surface 3B at an acute angle. A flat contact surface 3C extending in a direction is formed to face the outer peripheral side of the cutter main body 1 at a distance from the pressing surface 3A and the seating surface 3B. The slit 4 extends toward the inner peripheral side of the cutter main body 1 from between the contact surface 3C and the pressing surface 3A. Further, in the portion where the seating surface 3B of the insert mounting seat 3 and the contact surface 3C intersect, a relief 3D for avoiding interference with the cutting insert I is formed.

  Among the two parts of the insert mounting seat 3 and the insert mounting portion 2 divided by the slit 4, the side on which the pressing surface 3A is formed is the upper jaw 2A and the seating surface 3B is formed. The side is the lower jaw 2B. Here, the width of the upper jaw 2A in the circumferential direction of the cutter body 1 is sufficiently smaller than the width of the lower jaw 2B, and the width becomes narrower toward the inner circumferential side from the radial center of the cutter body 1 The upper jaw portion 2A is elastically deformable in a direction away from the lower jaw portion 2B centering on the inner peripheral end portion of the cutter main body 1, that is, the rear end portion of the slit 4. Of the two inner surfaces of the slits 4 opposed to each other in the circumferential direction of the cutter body 1, the inner surface on the upper jaw 2A side is the upper inner surface 4A, and the inner surface on the lower jaw 2B is the lower jaw It is set as a part side inner side 4B.

  Here, in the first embodiment shown in FIGS. 1 to 9, as shown in FIG. 2, the slit 4 is a portion where most of the inner peripheral side of the cutter body 1 opens to the insert mounting seat 3 on the outer peripheral side. The upper jaw side inner side surface 4A and the lower jaw side inner side surface 4B are expanded with a step so as to be wider in the circumferential direction of the cutter main body 1 than in the cutter main body 1, and the inner peripheral side portion of the wide cutter main body 1 has the above axis It is formed in a substantially arc shape that is convex on the opposite side to the cutter rotational direction T when viewed from the O direction. On the other hand, in the insert mounting portion 2 adjacent to the cutter rotational direction T side of the insert mounting portion 2 in which the slit 4 is formed, the insert mounting on the opposite side of the cutter rotational direction T to the lower jaw 2B of the insert mounting portion 2 A circular through hole is formed at a position substantially at the center of the concave arc formed by the inner peripheral portion of the slit 4 of the portion 2.

  And while the through-hole formed in this lower jaw part 2B is made into the latching | locking part 5A of the insert attaching part 2 in this embodiment, this latching | locking part 5A is other than the insert attaching part 2 formed in the lower jaw 2B. The cutter rotation direction T formed on the upper jaw side inner side surface 4A among the inner side surfaces of the wider inner peripheral portion in the slit 4 of the other insert attaching portion 2 adjacent to the side opposite to the cutter rotation direction T The surface which becomes convex on the opposite side is the arc-shaped surface 5B in the present embodiment, and the locking portions 5A and the arc-shaped surface 5B are formed in the same number as the insert mounting portion 2 in pairs. In the first embodiment, the surface of the upper jaw 2A facing in the cutter rotational direction T is formed in a concave curve as seen in the direction of the axis O as shown in FIG. 2 in the cutter rotational direction T side of the pressing surface 3A. At the same time, the cutter rotational direction T side of the slit 4 is formed in a convex curved shape, and the root portion on the inner peripheral side of the cutter main body 1 of the upper jaw portion 2A is narrowed in the circumferential direction.

  Furthermore, in the present embodiment, the cutter rotation of the insert mounting portion 2 in which the arc-shaped surface 5B is formed from the one end which is the outer peripheral end of the cutter main body 1 to the other end which is the inner peripheral end The distance from the center of the through hole which is the locking portion 5A of the insert attaching portion 2 adjacent to the direction T is formed to be gradually smaller. Therefore, the distance is from the other end of the arc-shaped surface 5B to one end Conversely, it gets bigger. In the present embodiment, the locking portion 5A and the arc-shaped surface 5B of another insert mounting portion 2 adjacent to the side opposite to the cutter rotation direction T of the insert mounting portion 2 in which the locking portion 5A is formed The locking portion 5A and the arc-shaped surface 5B are paired.

  The cutting insert I detachably mounted on the insert mounting seat 3 of the insert mounting portion 2 of such a blade insertable cutter is formed of a hard material such as cemented carbide having a hardness higher than that of the cutter main body 1, In the state of being attached to the insert mounting seat 3, there is provided a thick plate-like insert main body 11 having a generally oblique pentagonal shape as shown in FIGS. 5 and 8 when viewed from the direction of the axis O. Among the five end surfaces of the insert body 11, one of the two end surfaces facing the opposite side is a pressed surface 11 A that is pressed by the pressing surface 3 A of the insert mounting seat 3, and the other is the insert mounting seat 3. The mounting surface 11B is in close contact with the seating surface 3B.

  The pressed surface 11A and the mounting surface 11B are formed in a V-shape with a concaved cross section capable of abutting on the pressing surface 3A and the seating surface 3B, respectively. Is angled so as to be slightly wider. Further, the distance between the pressed surface 11A and the mounting surface 11B is slightly larger than the distance between the pressing surface 3A and the seating surface 3B in a state where the upper jaw 2A is not elastically deformed.

  Further, in this manner, the mounting surface 11B is seated on the seating surface 3B and the pressed surface 11A is pressed by the pressing surface 3A so that the cutting insert I is directed to the outer peripheral side of the cutter body 1 in a state of being attached to the insert mounting seat 3 Of the two end faces of the insert main body 11, the end face on the upper jaw 2A side continuous with the pressed surface 11A and directed in the cutter rotational direction T is a rake face 11C and is continuous with the mounting face 11B and directed toward the outer periphery The end face on the lower jaw portion 2B side is a flank 11D, and a cutting edge 12 longer than the thickness of the cutter body 1 in the insert mounting portion 2 is formed at the intersection ridge line between the rake face 11C and the flank 11D. . Furthermore, in this mounting state, the end face connected to the mounting surface 11B and directed to the rear end side of the insert mounting portion 2 is the abutted surface 11E brought into contact with the contact surface 3C of the insert mounting portion 2.

  Furthermore, the wrench W for elastically deforming the upper jaw 2A of the insert attaching portion 2 in the attaching and detaching operation of the cutting insert I has a shape common to the first to third embodiments. , The longitudinal end of the wrench main body 21 in the shape of a regular hexagonal cross section as shown in FIG. 28 to FIG. Part), two pins 22, 23 of equal length which are shorter than the wrench body 21 vertically projecting on one side of the wrench body 21 are separated and formed in parallel with each other in one body with the wrench body 21. It is F-shaped.

  In the present embodiment, the pins 22 and 23 are circular in cross section having the same diameter, and the diameter of the pins 22 and 23 can be fitted into the through hole as the locking portion 5A. The size is such that the size can be inserted into the inner peripheral end of the wide slit 4 on the inner peripheral side of the cutter main body 1, but from the circumferential width of the opening to the insert mounting seat 3 side of the narrow slit 4 Is being made smaller. In addition, the distance between the pins 22 and 23 is also such that, with one of the pins 22 and 23 fitted in the locking portion 5A, the other can be inserted into the inner peripheral end of the slit 4 as shown in FIG. It is done.

  Further, among the outer peripheral surfaces of these pins 22 and 23, an edge of the outer peripheral surface of the pin 22 located at the far end of the longitudinal direction of the wrench main body 21 facing the longitudinal rear end side of the wrench 22 facing the longitudinal direction And the distance between the end portion of the pin 23 located on the rear end side in the longitudinal direction of the pin 22 and the edge facing the front end side of the longitudinal direction of the pin 23 is the width of the slit 4 when the upper jaw 2A is not elastically deformed More than the distance between the one end of the arcuate surface 5B at the outer peripheral end of the curved portion and the portion facing the one end side of the arcuate surface 5B at the inner peripheral surface of the locking portion 5A (through hole) paired with the arcuate surface 5B. It is made smaller.

  In order to elastically deform the upper jaw portion 2A with such a wrench W and attach the cutting insert I to the insert mounting seat 3, as shown in FIGS. 4 to 6, the wrench is firstly attached with the cutting insert I not attached. The pin 23 on the rear end side in the longitudinal direction of the main body 21 is adjacent to the cutter rotational direction T side of one insert mounting portion 2 other than the one insert mounting portion 2 in which the insert mounting seat 3 for mounting the cutting insert I is formed. And the pin 22 at the foremost end in the longitudinal direction is the other end of the arc-shaped surface 5B of the one insert mounting portion 2 and the cutter body 1 It inserts in the inner peripheral end of the slit 4 of the inner peripheral side of.

  Then, from this state, as shown in FIG. 7 to FIG. 9, the wrench 22 is positioned such that the pin 22 is positioned at the outer peripheral end of the portion widened from the inner peripheral end of the slit 4, that is, one end of the arcuate surface 5B. The handle on the rear end side in the longitudinal direction is rotated clockwise about the pin 23 in FIGS. 5 and 8. At this time, the distance between the locking portion 5A and the arc-shaped surface 5B gradually increases toward the other end of the arc-shaped surface 5B, and the distance between the edges of the outer peripheral surfaces of the pins 22 and 23 opposed in the longitudinal direction of the wrench main body 21 is , One end of the arcuate surface 5B in a state in which the upper jaw portion 2A is not elastically deformed, and one end side of the arcuate surface 5B in the inner peripheral surface of the locking portion 5A (through hole) paired with the arcuate surface 5B. The edge of the pin 22 is in sliding contact with the arc-shaped surface 5B in the middle of rotation because it is smaller than the interval with the portion, and the arc-shaped surface 5B is pressed at the end of the arc-shaped surface 5B. The upper jaw portion 2A of the insert attaching portion 2 is pulled up in the cutter rotational direction T side, and the upper jaw portion 2A is elastically deformed in a direction away from the lower jaw portion 2B.

  Accordingly, since the distance between the pressing surface 3A of the insert mounting seat 3 and the seating surface 3B is thereby expanded, the cutting insert I can be inserted into the insert mounting seat 3 of the one insert mounting portion 2 as shown in FIGS. And then, as shown in FIGS. 4 to 6, the wrench body 21 is rotated in the direction opposite to the direction in which the upper jaw 2A is elastically deformed (counterclockwise in FIGS. 5 and 8). Then, the cutting insert I is mounted on the insert mounting seat 3 with the pressed surface 11A pressed by the pressing surface 3A of the upper jaw 2A. By performing such an operation on the insert mounting seats 3 of all the insert mounting portions 2, the indexable cutter according to the first embodiment is configured.

  In the indexable cutter configured in this manner, one of the two pins 22 and 23 protruding from the wrench main body 21 of the wrench W is fitted into the locking portion 5A, which is a through hole, and the other The pin 22 is inserted into the inner peripheral end of the slit 4 and the upper jaw portion 2A is elastically deformed by the rotation operation of the wrench main body 21 with one pin 23 as the center. And since the rotation operation at the time of this elastic deformation is limited from the inner peripheral end where the width of the slit 4 becomes wide to the opening to the insert mounting seat 3, the wrench W is erroneously rotated in the reverse direction. Even if the cutter main body 1 is formed with a large number of insert mounting portions 2, the handle of the wrench main body 21 does not approach the adjacent insert mounting portion 2 too much.

  Furthermore, in the indexable cutter of the above-described configuration, the upper jaw causes the elastic deformation of the pair of the locking portion 5A and the arc-shaped surface 5B for elastically deforming the upper jaw 2A of one insert mounting portion 2 in this manner. One insert mounting portion 2 in which the portion 2A is formed and the one insert mounting portion 2 are formed in another one insert mounting portion 2 spaced in the circumferential direction of the cutter body 1. Therefore, a large distance can also be secured between the pair of locking portions 5A and the arc-shaped surface 5B. Therefore, as described above, a large number of insert mounting portions 2 are provided on the outer peripheral portion of the cutter main body 1 When the number of cutting edges 12 is increased, the upper jaw portion 2A is elastically deformed to a required size and the cutting insert I is pressed with a sufficient elastic force even when the individual insert mounting portions 2 become smaller. It is possible to improve the mounting stability of the cutting insert I and perform high-precision cutting.

  Further, in the present embodiment, among the locking portion 5A and the arc-shaped surface 5B which make a pair in this manner, the arc-shaped surface 5B is a cutter main body 1 from the insert mounting seat 3 of the one insert mounting portion 2 which elastically deforms the upper jaw 2A. It is formed in the upper jaw side inner side 4A of the slit 4 extended to the inner peripheral side of. Therefore, since the slit 4 itself is a groove in which the arc-shaped surface 5B is formed, it is not necessary to form another groove in the one insert mounting portion 2 in order to form the arc-shaped surface 5B. By forming another groove, it is possible to prevent the insert mounting portion 2 from being cut more than necessary and losing its rigidity.

  Furthermore, in the present embodiment, the pair of the locking portion 5A and the arc-shaped surface 5B are formed in the two insert mounting portions 2 adjacent in the circumferential direction of the cutter body 1, respectively. For this reason, it is possible to prevent the gap from becoming larger than necessary while securing the distance between the locking portion 5A and the arc-shaped surface 5B which make a pair as described above. The distance between the two pins 22 and 23 of W can also be prevented from becoming larger than necessary, so that even with a wrench W having a short wrench body 21 serving as a power point, the upper jaw 2A is easily elastically deformed with a small force. It becomes possible.

  Next, in the second embodiment shown in FIG. 10 to FIG. 18, the locking portion 5A which is a through hole formed in the root portion on the inner peripheral side of the cutter main body 1 of the upper jaw portion 2A of one insert mounting portion 2 A pair of arc-shaped surfaces 5B formed in the slits 4 of one other insert mounting portion 2 adjacent to the cutter rotational direction T other than the one insert mounting portion 2 form a pair. Therefore, the slit 4 formed in the other one insert mounting portion 2 is substantially centered on the locking portion 5A of the one insert mounting portion 2 located on the opposite side to the cutter rotational direction T. It is formed in a substantially arc shape that is convex on the rotational direction T side.

  An arc-shaped surface 5B paired with the locking portion 5A is formed on the upper jaw side inner side surface 4A facing the side opposite to the cutter rotational direction T of the slit 4. Here, in the arc-shaped surface 5B in the second embodiment, the inner peripheral end of the slit 4 on the inner peripheral side of the cutter main body 1 is one end, and the slit 4 is an insert mounting seat 3 on the outer peripheral side of the cutter main body 1 The outer peripheral end in front of the opening is the other end, and the distance from the one end to the other end gradually decreases from the one end to the other end. The distance from 5B is the edge toward the longitudinal direction front end side of the outer peripheral surface of the pin 22 at the tip of the wrench W, and the longitudinal rear end side of the outer peripheral surface of the pin 23 at the rear end side. It is smaller than the distance from the edge.

  In such a second embodiment, as shown in FIGS. 13 to 15, the pin 22 of the wrench W is inserted into and locked to the locking portion 5A of the one insert mounting portion 2, and the other one Insert the pin 23 into the inner peripheral end of the slit 4 which is one end of the arc-shaped surface 5B of the two insert mounting portions 2 and then place the pin 23 at the other end of the arc-shaped surface 5B as shown in FIGS. By rotating the wrench main body 21 about the pin 22, the pin 23 slides on the arc-shaped surface 5B to lift the upper jaw 2A and elastically deform in a direction away from the lower jaw 2B. Therefore, the cutting insert I can be pressed and attached by returning the wrench W to the original position after the cutting insert I is seated on the insert mounting seat 3 in the other one insert mounting portion 2.

  Furthermore, in the third embodiment shown in FIG. 19 to FIG. 27, as shown in FIG. 19 to FIG. 21, the upper jaw side inner side surface 4A in the slit 4 of one insert mounting portion 2 A substantially semicircular recess is formed as the locking portion 5A, and the cutter of the upper jaw 2A in another one of the insert mounting portions 2 located on the opposite side of the one cutter mounting direction T of the insert mounting portion 2 The side surface facing the rotational direction T is an arc-shaped surface 5B that makes a pair with the locking portion 5A. That is, in the present embodiment, the arc-shaped surface 5B is formed in the groove between the two insert mounting portions 2 spaced in the circumferential direction.

  The arc-shaped surface 5B is formed such that the distance between the arc-shaped surface 5B and the locking portion 5A decreases from one end on the inner peripheral side of the cutter main body 1 to the other end on the outer peripheral side. And the arc-shaped surface 5B, as in the second embodiment, the edge of the outer peripheral surface of the distal end pin 22 of the wrench W facing the front end side of the wrench main body 21 and the pin 23 of the rear end side. It is smaller than the distance between the outer peripheral surface and the edge facing the rear end side in the longitudinal direction.

  Also in such a third embodiment, as shown in FIG. 22 to FIG. 24, the pin 23 of the wrench W is inserted into and locked to the locking portion 5A, and the inner periphery of the slit 4 which is one end of the arcuate surface 5B. By inserting the pin 22 at the end and rotating the wrench main body 21 about the pin 23 so that the pin 22 is positioned at the other end of the arc-shaped surface 5B as shown in FIGS. 25 to 27, the pin 22 is arc-shaped In sliding contact with 5B, the pin 23 lifts the upper jaw 2A of the one insert mounting portion 2 and elastically deforms in a direction away from the lower jaw 2B. Therefore, the cutting insert I can be pressed and attached by returning the wrench W to the original position after the cutting insert I is seated on the insert mounting seat 3 of the one insert mounting portion 2.

  As described above, also in the second and third embodiments, even if the wrench W is erroneously rotated in the reverse direction or the multiple insert mounting portions 2 are formed in the cutter main body 1, the wrench main body 21 is held The hand does not approach the adjacent insert mounting portion 2 too much. And when many insert mounting parts 2 are formed in cutter main body 1 in this way, even if each insert mounting part 2 becomes small, it elastically deforms upper jaw part 2A to a required size, and cutting insert I is made Since it is possible to press and attach with a sufficient elastic force, it is possible to improve the attachment stability of the cutting insert I and to perform high-precision cutting.

Reference Signs List 1 cutter body 2 insert mounting portion 2A upper jaw 2B lower jaw 3 insert mounting seat 3A pressing surface 3B seating surface 4 slit 4A upper jaw side inner side surface 4B lower jaw side inner side surface 5A locking portion 5B arc surface 11 insert body 12 cutting blade 21 Wrench main body 22, 23-pin O Axis of cutter main body 1 T cutter rotational direction I Cutting insert W wrench

Claims (3)

A plurality of insert attachment portions to which a cutting insert having a cutting edge is detachably attached are formed at intervals in the circumferential direction of the cutter body, on an outer peripheral portion of a disk-like cutter body rotated about an axis;
The insert mounting portion includes an insert mounting seat which penetrates the cutter main body in the axial direction and opens at an outer periphery of the cutter main body, and an inner peripheral side of the cutter main body communicating with an inner peripheral portion of the insert mounting seat. And a slit extending to the
One of the two inner side surfaces of the insert mounting seat facing each other with the slit interposed therebetween is a seating surface on which the cutting insert is seated, and the other inner side is the seating surface of the cutting insert It is a pressing surface that presses on the surface side,
Of the insert attachment portion, the side on which the seating surface is formed is a lower jaw, and the side on which the pressing surface is formed is an upper jaw that can be elastically deformed in a direction away from the lower jaw. ,
In the cutter body, a locking portion to which one of the two pins projecting in parallel from one side of the wrench main body of the wrench for elastically deforming the upper jaw, and the other pin are provided. An arc-shaped surface whose sliding distance from the one end to the other end decreases from the one end toward the other end is formed to penetrate the cutter main body in the same number as the number of the insert mounting portions. ,
Of the pair of the locking portion and the arc-shaped surface, one is formed in the upper jaw of the insert mounting portion to be elastically deformed, and the other is other than the insert mounting portion having the upper jaw to be elastically deformed. An indexable cutter according to claim 1, characterized in that it is formed on the insert mounting portion of the blade.   The said one of the said latching | locking part which makes the said pair, and the said arc-shaped surface is formed in the said slit of the said insert attachment part which elastically deforms the said upper jaw part, It is characterized by the above-mentioned. Indexable cutter.   The blade edge replacement according to claim 1 or 2, wherein the locking portion and the arc-shaped surface forming the pair are formed in the insert mounting portion adjacent in the circumferential direction of the cutter main body. Expression cutter.

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