JP6327594B1 - Cutting tools - Google Patents

Abstract

Provided is a cutting tool capable of suppressing an increase in work load when exchanging a cutting insert while reducing the size of a screw member.
A tool body 2 of a cutting tool 1 has a plurality of insert mounting portions 3 formed therein. The insert mounting portion 3 is recessed in the outer surface of the tool body 2, and has a bottom surface 31 on which the cutting insert 5 is seated and an opposing wall surface 32 that faces the bottom surface 31 with a space therebetween. . The opposing wall surface 32 includes a first wall surface 321 and a second wall surface 322 formed on the outer surface side of the tool body 2 with respect to the first wall surface. The second wall surface 322 is further away from the bottom surface 31 than the first wall surface 321.
[Selection] Figure 10

Description

  The present invention relates to a cutting tool.

  The thing of patent document 1 is known as a cutting tool. The tool body of the cutting tool has a plurality of insert mounting portions, and a cutting insert is attached to each insert mounting portion. As the tool body rotates, the cutting edge of the cutting insert cuts the workpiece.

  A wedge member is used for attachment to the cutting insert to the insert attachment portion. The wedge member is fastened to the tool body by a screw member, and is disposed between the inner surface of the insert mounting portion and the cutting insert. The cutting insert comes into contact with the wedge member, is pressed against the bottom surface of the insert mounting portion, and is fixed at the insert mounting portion.

  When wear or chipping occurs on the cutting edge of the cutting insert, the operator removes the cutting insert from the insert mounting portion and replaces it with a new cutting insert. By using the cutting edge of a new cutting insert, cutting with a cutting tool can be continued.

  When exchanging the cutting insert, the operator rotates the screw member. As the screw member rotates, the wedge member moves toward the outer side of the tool body. As a result, a gap is formed between the wedge member and the cutting insert, and the contact between them is released. The operator pulls and removes the used cutting insert from between the wedge member and the bottom surface, and replaces the cutting insert by inserting a new cutting insert. In order to perform the replacement work smoothly, the gap formed between the wedge member and the cutting insert is preferably sufficiently large.

JP 2001-25914 A

  By the way, in such a cutting tool, in order to improve cutting efficiency, it is considered to attach as many cutting inserts as possible to the tool body. Cutting using a large number of cutting inserts is particularly effective when cutting a relatively soft work material such as aluminum. In order to attach many cutting inserts to the tool body, it is necessary to reduce the size of the wedge member and the screw member.

  However, in order to reduce the size of the screw member, it is necessary to reduce the pitch of the screw member. For this reason, when moving a wedge member by rotation of a screw member as mentioned above, it is necessary to rotate a screw member more. Thus, the downsizing of the screw member may increase the work load when the cutting insert is replaced.

  This invention is made | formed in view of such a subject, The objective provides the cutting tool which can suppress the increase in the work load at the time of replacing | exchanging a cutting insert, aiming at size reduction of a screw member. There is.

  In order to solve the above problems, a cutting tool according to the present invention includes a tool body having a plurality of insert mounting portions, a cutting insert having a cutting edge and detachably attached to the insert mounting portion, and a first tool. A wedge member having a contact surface and a second contact surface and disposed on the insert mounting portion; and a screw member for fastening the wedge member to the tool body. The insert mounting portion is recessed in the outer surface of the tool body, and has a bottom surface on which the cutting insert is seated and an opposing wall surface facing the bottom surface with a space therebetween. The wedge member is disposed between the cutting insert and the opposing wall surface, abuts against the opposing wall surface at the first abutting surface, and abuts against the cutting insert at the second abutting surface to press the cutting insert against the bottom surface and When the member rotates, the member moves toward the inner side and the outer side of the tool body. The opposing wall surface includes a first wall surface and a second wall surface formed on the outer surface side of the tool body with respect to the first wall surface. The second wall surface is further away from the bottom surface than the first wall surface.

  According to the said structure, the opposing wall surface of the insert attaching part with which the 1st contact surface of a wedge member contacts has a 1st wall surface and a 2nd wall surface. The second wall surface is formed on the outer surface side of the tool body with respect to the first wall surface, and is separated from the bottom surface with respect to the first wall surface.

  For this reason, when removing the cutting insert, the wedge member can be largely separated from the cutting insert by rotating the screw member and moving the wedge member to a position where it comes into contact with the second wall surface. That is, it is possible to reduce the number of rotations of the screw member that is necessary for largely separating the wedge member from the cutting insert. Thereby, it is possible to easily remove the used cutting insert from between the wedge member and the bottom surface and insert a new cutting insert.

  Furthermore, when a new cutting insert is fixed, the wedge member can be moved closer to the new cutting insert by rotating the screw member and moving the wedge member to a position where it contacts the first wall surface. Thereby, the rotation speed of the screw member required in order to fix a new cutting insert can be decreased.

  Therefore, according to the said structure, it becomes possible to suppress the increase in the work load at the time of replacing | exchanging cutting insert, aiming at size reduction of a screw member.

  The wedge member may be pressed against the opposing wall surface by being biased by the elastically deformed screw member.

  According to this configuration, the first contact surface of the wedge member can be reliably brought into contact with the opposing wall surface with a simple configuration.

  The insert mounting portion is formed with a screw hole to be screwed with the screw member in a portion inside the tool body with respect to the bottom surface and the opposing wall surface, and the wedge member is formed with a through hole through which the screw member is inserted, and is opposed to the cutting insert. The axis of the through hole of the wedge member disposed between the wall surface and the wall surface may be biased to the bottom side with respect to the axis of the screw hole.

  According to this configuration, the screw member is elastically deformed by biasing the axis of the through hole of the wedge member disposed between the cutting insert and the opposing wall surface to the bottom side with respect to the axis of the screw hole. Reaction force to the side can be generated. As a result, the first contact surface of the wedge member can be reliably contacted with the opposing wall surface.

  The opposing wall surface has a step portion that discontinuously connects the first wall surface and the second wall surface.

  According to this configuration, when removing the cutting insert, the wedge member can be inclined with the stepped portion as a fulcrum by moving the wedge member to the stepped portion. As a result, the wedge member can be largely separated from the cutting insert.

  A gap may be formed between the inner surface of the through hole and the screw member that passes through the through hole.

  According to this configuration, the wedge member is loose with respect to the screw member. Therefore, by moving the wedge member to the stepped portion, the wedge member can be reliably tilted using the play. As a result, the wedge member can be largely separated from the cutting insert.

  The second contact surface may be inclined so as to approach the axis of the through hole from the outer surface side to the inner side of the tool body.

  According to this structure, the clearance gap between the 2nd contact surface of the wedge member inclined using the level | step-difference part as a fulcrum, and the cutting insert can be enlarged further. As a result, it is possible to easily remove the used cutting insert from between the wedge member and the bottom surface and insert a new cutting insert.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting tool which can suppress the increase in the work load at the time of replacing | exchanging cutting inserts can be provided, aiming at size reduction of a screw member.

It is a perspective view which shows the cutting tool and working tool which concern on embodiment. It is a perspective view which shows the cutting insert of FIG. It is an enlarged view which shows the periphery of the insert attachment part of FIG. It is an enlarged view which shows the periphery of the insert attachment part of FIG. It is an enlarged view which shows the periphery of the insert attachment part of FIG. It is a front view which shows the work tool of FIG. It is an enlarged view which shows the work tool of FIG. It is sectional drawing which shows the periphery of the insert attachment part of FIG. It is sectional drawing which shows the periphery of the insert attachment part of FIG. It is sectional drawing which shows the periphery of the insert attachment part of FIG.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  First, an outline of the cutting tool 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the cutting tool 1 and the work tool 9. FIG. 2 is a perspective view showing the cutting insert 5.

  The cutting tool 1 is called a milling cutter or the like. The cutting tool 1 performs right-angle shoulder cutting of a work material by rotating about an axis C2 which is a virtual straight line. The cutting tool 1 includes a tool body 2 and a cutting insert 5. The work tool 9 is prepared separately from the cutting tool 1.

  In addition, in this specification, the cutting tool 1 arrange | positioned so that the axis line C2 may extend in a perpendicular direction is demonstrated. Further, the upper direction in the vertical direction is referred to as “upper” and the lower side is referred to as “lower”. A direction along the axis C2 is referred to as an “axial direction”, a direction around the axis C2 is referred to as a “circumferential direction”, and a direction orthogonal to the axis C2 is referred to as a “radial direction”. Such an arrangement of the cutting tool 1 does not limit the use mode of the present invention.

  As shown in FIG. 1, the tool body 2 is formed so as to be a target to be rotated about the axis C <b> 2. The tool body 2 is formed with a plurality of insert mounting portions 3 and a tool insertion recess 4. The insert mounting portion 3 is a notch formed over the peripheral side surface 21 and the lower surface 22 of the tool body 2. The tool insertion recess 4 is formed above each insert mounting portion 3 and is recessed from the peripheral side surface 21 toward the axis C2.

  One cutting insert 5 is attached to each insert attaching portion 3. As shown in FIG. 2, the cutting insert 5 includes an insert body 50 and a diamond sintered body 51. The insert body 50 is made of a cemented carbide and has a substantially flat plate shape. The back surface 50b (see FIG. 4) of the insert body 50 is a flat surface. A notch extending from the upper end surface 50c (see FIG. 5) to the lower end surface 50d is formed at the end of the front surface 50a of the insert body 50. The diamond sintered body 51 has cutting edges 51a to 51c at the ridge line portion. The diamond sintered body 51 is brazed to a portion of the notch of the insert main body 50 near the lower end surface 50d.

  The upper part of the tool body 2 is fixed to a jig called an arbor (not shown). When the jig rotates, the tool body 2 rotates in the direction indicated by the arrow R in FIG. With the rotation of the tool body 2, the cutting edges 51a to 51c of each cutting insert 5 rotate about the axis C2. The cutting insert 5 cuts the work material by pressing the cutting edges 51a to 51c against the surface of the work material.

  The work tool 9 is used for adjusting the positions of the cutting edges 51a to 51c in each insert mounting portion 3 and rotating a screw member 7 (see FIG. 3) described later. The operator can adjust the positions of the cutting edges 51a to 51c by inserting the work tool 9 into the tool insertion recess 4 and rotating it. Further, the operator can rotate the screw member 7 by engaging the distal end portion 91a of the work tool 9 with the engagement groove 74 (see FIG. 3) of the screw member 7.

  Next, the attachment of the cutting insert 5 will be described in detail with reference to FIGS. 3 to 5. 3 to 5 are enlarged views showing the periphery of the insert mounting portion 3. FIG. 3 shows the insert mounting portion 3 in a perspective view, and shows a state in which a member disposed on the insert mounting portion 3 is disassembled. 4 shows the insert mounting portion 3 from the lower surface 22 side of the tool body 2, and FIG. 5 shows the insert mounting portion 3 from the peripheral side surface 21 side of the tool body 2.

  As shown in FIG. 3, the insert mounting portion 3 has a bottom surface 31 and an opposing wall surface 32 inside thereof. The bottom surface 31 is a plane. The opposing wall surface 32 faces the bottom surface 31 with a gap in the circumferential direction. The opposing wall surface 32 includes a first wall surface 321, a second wall surface 322, and a step portion 323. The second wall surface 322 is formed on a radially outer side than the first wall surface 321, and is separated from the bottom surface 31 than the first wall surface 321. The first wall surface 321 and the second wall surface 322 are connected to each other through a step portion 323.

  Moreover, the lower end 34 and the upper end 36 of the insert mounting part 3 are open. The upper end 36 communicates with a tool insertion recess 4 described later. A screw hole 38 is formed in a portion of the insert mounting portion 3 on the inner side of the first wall surface 321 in the radial direction. The screw hole 38 extends in the radial direction along the axis C38 (see FIG. 8), and a female screw is formed on the inner surface thereof.

  The cutting tool 1 includes a wedge member 6 and a screw member 7 as members for fixing the cutting insert 5 to the insert mounting portion 3.

  As shown in FIG. 3, the wedge member 6 has a first contact surface 61, a second contact surface 62, and a step surface 63 on the outer surface. The second contact surface 62 and the step surface 63 are opposed to the first contact surface 61 with the central portion of the wedge member 6 interposed therebetween. The step surface 63 is offset from the second contact surface 62 to the first contact surface 61 side.

  A screw hole 65 penetrating from one side surface to the other side surface is formed in the central portion of the wedge member 6. The screw hole 65 extends along the axis C65 (see FIG. 8). The second contact surface 62 is inclined with respect to this axis C65. A female screw is formed on the inner surface of the screw hole 65.

  The screw member 7 is also referred to as “left and right screw”. The screw member 7 has a substantially cylindrical shape extending along a predetermined axis, and a first screw portion 71 and a second screw portion 72 are formed on the outer peripheral surface thereof. The first screw portion 71 is a right-hand screw, and the second screw portion 72 is a left-hand screw. At the end of the screw member 7 on the second screw portion 72 side, an engaging groove 74 that engages with the tip end portion 91a (see FIG. 6) of the work tool 9 is formed in a recessed manner. In the wedge member 6, the first screw portion 71 of the screw member 7 is screwed with the screw hole 38 of the insert mounting portion 3, and the second screw portion 72 is screwed with the screw hole 65 of the wedge member 6. 2 is fastened. A minute gap (so-called “back”) is provided between the second screw portion 72 and the screw hole 65 of the wedge member 6.

  As shown in FIG. 4, the cutting insert 5 is disposed on the insert mounting portion 3 such that the back surface 50 b is seated on the bottom surface 31. As described above, the back surface 50b of the cutting insert 5 and the bottom surface 31 of the insert mounting portion 3 are both flat. Therefore, the cutting insert 5 seated on the bottom surface 31 can move along the bottom surface 31 unless it is completely fixed by the wedge member 6.

  A gap is formed between the front surface 50 a of the cutting insert 5 disposed in the insert mounting portion 3 and the opposing wall surface 32. As shown in FIG. 5, the wedge member 6 is disposed in the gap. As shown by an arrow S in FIG. 3, the operator can take out the used cutting insert 5 from between the wedge member 6 and the bottom surface 31 or insert and install a new cutting insert 5.

  Next, the work tool 9 will be described in detail with reference to FIGS. 6 and 7. FIG. 6 is a front view showing the work tool 9. FIG. 7 is an enlarged view showing the work tool 9, and shows the work tool 9 from the distal end portion 91a side.

  As shown in FIG. 6, the work tool 9 includes a shaft body 91, an attachment 92, and a grip portion 98.

  The shaft body 91 is a substantially cylindrical member extending along the tool axis C9 which is a virtual straight line. The tip 91a of the shaft body 91 is provided with irregularities that can be engaged with the engagement groove 74 (see FIG. 3) of the screw member 7 described above. The distal end portion 91 a can transmit rotational torque to the screw member 7 by engaging with the engagement groove 74. A grip portion 98 for gripping by an operator is fixed to an end portion of the shaft body 91 on the side opposite to the tip portion 91a.

  The attachment 92 is a member that is detachably attached to the shaft body 91. The attachment 92 has a through hole, and is attached to the shaft body 91 by inserting the shaft body 91 into the through hole. The attachment 92 has a cam portion 94 and a cylindrical portion 96.

  The cam portion 94 has a cam surface 94a and a cam portion end surface 94b. As shown in FIG. 7, the cam surface 94a is disposed around the tool axis C9 and is curved. The cam surface 94a is formed such that the distance r94 from the tool axis C9 gradually changes around the tool axis C9. The cam part end surface 94b is a surface substantially perpendicular to the tool axis C9 and is connected to the end of the cam surface 94a.

  The cylindrical portion 96 is provided on the distal end portion 91a side of the cam portion 94 and is connected to the cam portion end surface 94b. As shown in FIG. 6, the length of the cylindrical portion 96 in the direction along the tool axis C9 is L96. The cylindrical portion 96 has a cylindrical surface 96a and a cylindrical portion end surface 96b. As shown in FIG. 7, the cylindrical surface 96a is a peripheral side surface of the cylinder centering on the tool axis C9. That is, the distance r96 from the tool axis C9 to the cylindrical surface 96a is substantially constant regardless of the position around the tool axis C9. The cylindrical portion end surface 96b is a surface substantially perpendicular to the tool axis C9, and is connected to the end of the cylindrical surface 96a.

  Next, adjustment of the positions of the cutting edges 51a to 51c in the insert mounting portion 3 will be described.

  The operator inserts the work tool 9 into the tool insertion recess 4 from the tip 91a side and rotates it around the tool axis C9. When the work tool 9 rotates, the cam surface 94a comes into contact with the upper end surface 50c (see FIG. 5) of the cutting insert 5.

  As described above, the distance r94 (see FIG. 7) from the tool axis C9 to the cam surface 94a is formed so as to gradually change around the tool axis C9. Therefore, the distance from the tool axis C <b> 9 to the portion where the cam surface 94 a and the upper end surface 50 c of the cutting insert 5 abut changes gradually with the rotation of the work tool 9. The cutting insert 5 is pressed downward by the cam surface 94a and moves. When the cutting insert 5 moves and the cutting edges 51 a to 51 c are arranged at appropriate positions, the operator pulls out the work tool 9 from the tool insertion recess 4.

  Next, the operator engages the distal end portion 91a (see FIG. 6) of the work tool 9 with the engagement groove 74 (see FIG. 3), and rotates the work tool 9, thereby increasing the fastening force of the screw member 7. Increase. Thereby, the cutting insert 5 is fixed in the insert attachment part 3, and adjustment of the position of the cutting blades 51a-51c is completed.

  Next, replacement work of the cutting insert 5 will be described with reference to FIGS. 8 to 10. 8 to 10 are cross-sectional views showing the periphery of the insert mounting portion 3, and are cross-sectional views in a plane including the axis C38 of the screw hole 38 and the axis C65 of the screw hole 65 of the wedge member 6. 8 to 10, the gap provided between the second screw portion 72 and the screw hole 65 of the wedge member 6 is omitted.

  FIG. 8 shows a state in which the cutting insert 5 is fixed to the insert mounting portion 3 and the cutting insert 5 can be used for cutting. The front surface 50 a of the cutting insert 5 is disposed so as to gradually approach the opposing wall surface 32 from the outer surface side to the inner side of the tool body 2. That is, the width of the gap formed between the front surface 50 a of the cutting insert 5 and the opposing wall surface 32 gradually decreases from the outer surface side to the inner side of the tool body 2.

  The wedge member 6 is disposed in the gap. When the screw member 7 is rotated clockwise, the wedge member 6 moves toward the radially inner side (that is, the inner side of the tool body 2). The moving distance of the wedge member 6 per rotation of the screw member 7 depends on the pitch of the first screw portion 71 and the second screw portion 72 of the screw member 7. By this movement, as shown in FIG. 8, the wedge member 6 contacts the first wall surface 321 of the opposing wall surface 32 at the first contact surface 61, and the front surface 50 a of the cutting insert 5 on the second contact surface 62. Abut. That is, the wedge member 6 is fitted between the front surface 50 a of the cutting insert 5 and the first wall surface 321.

  The cutting insert 5 receives a force directed to the bottom surface 31 from the second contact surface 62 of the wedge member 6, and the back surface 50 b comes into pressure contact with the bottom surface 31. In other words, the cutting insert 5 is sandwiched between the second contact surface 62 and the bottom surface 31 of the wedge member 6 and is fixed to the insert mounting portion 3.

  Here, the axis C65 of the screw hole 65 of the wedge member 6 is biased closer to the bottom surface 31 than the axis C38 of the screw hole 38 of the insert mounting portion 3. For this reason, the screw member 7 is elastically deformed so that the second screw portion 72 screwed into the screw hole 65 is biased toward the bottom surface 31 side than the first screw portion 71 screwed into the screw hole 38. To do. The wedge member 6 is biased toward the opposing wall surface 32 by the screw member 7 to be restored.

  When wear or chipping occurs in the cutting edges 51 a to 51 c of the cutting insert 5, the operator releases the fixing of the cutting insert 5. In this case, the operator rotates the screw member 7 counterclockwise.

  When the screw member 7 is rotated counterclockwise, the wedge member 6 moves toward the radially outer side (that is, the outer surface side of the tool body 2). The moving distance of the wedge member 6 per rotation of the screw member 7 here also depends on the pitch of the first screw portion 71 and the second screw portion 72 of the screw member 7. By this movement, as shown in FIG. 9, the contact between the second contact surface 62 of the wedge member 6 and the front surface 50 a of the cutting insert 5 is released. As a result, a gap CL is formed between the second contact surface 62 of the wedge member 6 and the front surface 50 a of the cutting insert 5.

  Even in the state shown in FIG. 9, it is possible to take out the used cutting insert 5 from between the wedge member 6 and the bottom surface 31 and insert a new cutting insert 5. However, in order to perform the operation smoothly, it is preferable that the gap CL is sufficiently large. Therefore, the operator further rotates the screw member 7 counterclockwise.

  As the screw member 7 rotates, the wedge member 6 moves further outward in the radial direction. As shown in FIG. 10, the first contact surface 61 of the wedge member 6 is disposed so as to straddle the first wall surface 321 and the second wall surface 322 of the opposing wall surface 32.

  As described above, a minute gap is provided between the second screw portion 72 and the screw hole 65 of the wedge member 6. Further, the wedge member 6 is biased toward the opposing wall surface 32 by the screw member 7. For this reason, the wedge member 6 is inclined with the stepped portion 323 as a fulcrum, and a part of the wedge member 6 contacts the second wall surface 322.

  The second wall surface 322 is further away from the bottom surface 31 than the first wall surface 321. Accordingly, the wedge member 6 is disposed so as to be further away from the bottom surface 31 by contacting the second wall surface 322. Thereby, the clearance CL is enlarged. As a result, it becomes possible to easily remove the used cutting insert 5 and insert a new cutting insert 5.

  Next, the effect | action by the cutting tool 1 and its effect are demonstrated.

  According to the configuration of the cutting tool 1, the opposing wall surface 32 of the insert mounting portion 3 with which the first contact surface 61 of the wedge member 6 contacts has a first wall surface 321 and a second wall surface 322. The second wall surface 322 is formed on the outer surface side of the tool body 2 with respect to the first wall surface 321, and is separated from the bottom surface 31 with respect to the first wall surface 321.

  For this reason, when removing the cutting insert 5, the screw member 7 is rotated, and the wedge member 6 is moved to a position where it abuts on the second wall surface 322, whereby the wedge member 6 can be largely separated from the cutting insert 5. . That is, the number of rotations of the screw member 7 that is necessary to largely separate the wedge member 6 from the cutting insert 5 can be reduced. This makes it possible to easily remove the used cutting insert 5 from between the wedge member 6 and the bottom surface 31 and insert a new cutting insert 5.

  Further, when the new cutting insert 5 is fixed, the screw member 7 is rotated, and the wedge member 6 is moved to a position where it abuts on the first wall surface 321, thereby bringing the wedge member 6 closer to the new cutting insert 5. be able to. Thereby, the rotation speed of the screw member 7 required in order to fix the new cutting insert 5 can be decreased.

  Therefore, according to the said structure, it becomes possible to suppress the increase in the work load at the time of replacing | exchanging the cutting insert 5, aiming at size reduction of the screw member 7. FIG.

  The wedge member 6 is pressed against the opposing wall surface 32 by being biased by the elastically deformed screw member 7.

  According to this configuration, the first contact surface 61 of the wedge member 6 can be reliably brought into contact with the opposing wall surface 32 with a simple configuration.

  In the insert mounting portion 3, a screw hole 38 to be screwed with the screw member 7 is formed in a portion inside the tool body 2 with respect to the bottom surface 31 and the opposing wall surface 32. The wedge member 6 has a screw hole 65 through which the screw member 7 is inserted. The axis C65 of the screw hole 65 of the wedge member 6 disposed between the cutting insert 5 and the opposing wall surface 32 is biased to the bottom surface 31 side with respect to the axis C38 of the screw hole 38.

  According to this configuration, the screw member 65 is biased to the bottom surface 31 side with respect to the axis line C65 of the screw hole 65 of the wedge member 6 disposed between the cutting insert 5 and the opposing wall surface 32. 7 can be elastically deformed to generate a reaction force toward the opposing wall surface 32. As a result, the first contact surface 61 of the wedge member 6 can be reliably brought into contact with the opposing wall surface 32.

  The opposing wall surface 32 has a stepped portion 323 that discontinuously connects the first wall surface 321 and the second wall surface 322.

  According to this configuration, when removing the cutting insert 5, the wedge member 6 can be inclined with the stepped portion 323 as a fulcrum by moving the wedge member 6 to the stepped portion 323. As a result, the wedge member 6 can be largely separated from the cutting insert 5.

  A gap is formed between the inner surface of the screw hole 65 and the screw member 7 inserted through the screw hole 65.

  According to this configuration, the wedge member 6 is loose with respect to the screw member 7. Therefore, by moving the wedge member 6 to the stepped portion 323, the wedge member 6 can be reliably tilted using the play. As a result, the wedge member 6 can be largely separated from the cutting insert.

  The second contact surface 62 may be inclined so as to approach the axis C65 of the screw hole 65 from the outer surface side to the inner side of the tool body 2.

  According to this structure, the clearance gap between the 2nd contact surface 62 of the wedge member 6 inclined using the level | step-difference part 323 as a fulcrum, and the cutting insert 5 can be enlarged further. As a result, it is possible to easily remove the used cutting insert 5 from between the wedge member 6 and the bottom surface 31 and insert a new cutting insert 5.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. Each element included in each of the specific examples described above and their arrangement, material, condition, shape, size, and the like are not limited to those illustrated, and can be changed as appropriate.

1: Cutting tool 2: Tool body 3: Insert mounting portion 31: Bottom surface 32: Opposing wall surface 321: First wall surface 322: Second wall surface 323: Stepped portion 38: Screw hole 5: Cutting inserts 51a to 51c: Cutting edge 6: Wedge member 61: first contact surface 62: second contact surface 65: screw hole (through hole)
7: Screw member

Claims (3)

A cutting tool,
A tool body in which a plurality of insert mounting portions are formed;
A cutting insert having a cutting edge and detachably attached to the insert mounting portion;
A wedge member having a first abutment surface and a second abutment surface and disposed in the insert mounting portion;
A screw member for fastening the wedge member to the tool body,
The insert mounting portion is recessed on the outer surface of the tool body, and has a bottom surface on which the cutting insert is seated, and an opposing wall surface facing the bottom surface with a gap therebetween,
The wedge member is disposed between the cutting insert and the opposing wall surface, contacts the opposing wall surface at the first contact surface, and contacts the cutting insert at the second contact surface. The insert is pressed against the bottom surface, and the screw member rotates to move toward the inner side and the outer side of the tool body,
The opposing wall surface includes a first wall surface, a second wall surface formed on the outer surface side of the tool body with respect to the first wall surface, and a step portion that discontinuously connects the first wall surface and the second wall surface. And having
The second wall, Ri you apart from the bottom surface than the first wall,
The insert mounting portion is formed with a screw hole to be screwed with the screw member in a portion inside the tool body with respect to the bottom surface and the opposing wall surface,
The wedge member has a through hole through which the screw member is inserted,
The axis of the through hole of the wedge member disposed between the cutting insert and the opposing wall surface is biased toward the bottom side with respect to the axis of the screw hole,
The wedge member is pressed against the opposing wall surface by being urged by the elastically deformed screw member.
Cutting tools. The cutting tool according to claim 1 , wherein a gap is formed between an inner surface of the through hole and the screw member inserted through the through hole. The cutting tool according to claim 2 , wherein the second contact surface is inclined from the outer surface side to the inner side of the tool body so as to approach the axis of the through hole.