JP6249354B1 - Tool body - Google Patents

Abstract

A tool body capable of suppressing rattling of a work tool is provided. In a tool insertion recess 4 of a tool body 2, a first axis C41 is arranged in a predetermined direction with respect to a second axis C42. When the work tool 9 is inserted, the tool insertion recess 4 presses the shaft 91 of the work tool 9 in a predetermined direction on the inner surface of the first recess 41, and the cylinder of the cylindrical portion 96 on the inner surface of the second recess 42. The surface 96a is pressed in a direction opposite to the predetermined direction, and the work tool 9 is fixed in the predetermined direction. [Selection] Figure 10

Description

  The present invention relates to a tool body of a cutting tool.

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

  The position of the cutting edge is adjusted by using a work tool prepared separately from the tool body. A cam surface whose distance from the tool axis gradually changes is formed on the outer surface of the work tool. The operator inserts the work tool into the recess formed in the tool body and rotates it around the tool axis. Thereby, the cutting insert is pressed against the cam surface and moves, and the position of the cutting edge changes.

International Publication No. 2017/010328

  According to the configuration described in Patent Document 1, when the position of the cutting edge is adjusted, the work tool receives a reaction force from the cutting insert on the cam surface. When rattling occurs in the work tool due to such a reaction force, it is difficult to stably press the cutting insert, and there is a problem that the accuracy of adjustment is reduced.

  This invention is made | formed in view of such a subject, The objective is to provide the tool body which can suppress the play of a working tool.

  In order to solve the above problems, a tool body according to the present invention includes an insert mounting portion to which a cutting insert is mounted, and a tool insertion recess disposed in a predetermined direction with respect to the insert mounting portion, and extends along the tool axis. A substantially cylindrical shaft body, a cam portion formed with a cam surface whose distance from the tool axis gradually changes, and a diameter provided between the tip portion and the cam portion of the shaft body is larger than the diameter of the shaft body. A tool insertion recess into which a work tool having a cylindrical surface on which a cylindrical surface is formed is formed. The tool insertion recess has a first recess that extends along the first axis and in which the tip of the shaft body is disposed, and a second recess that extends along the second axis and in which the cylindrical portion is disposed. The work tool is arranged in a predetermined direction with respect to the second axis so that when the work tool is inserted, the work tool presses the shaft body in the predetermined direction on the inner surface of the first recess, and the second recess The cylindrical surface of the cylindrical portion is pressed in the direction opposite to the predetermined direction on the inner side surface of the, and the work tool is fixed in the predetermined direction.

  According to the said structure, the end surface of a cutting insert can be pressed with a cam surface by inserting a work tool in a tool insertion recessed part, and rotating it around a tool axis line. Thereby, the cutting insert can be moved along a predetermined direction, and the position of the cutting edge can be adjusted.

  Here, the first axis is arranged in a predetermined direction with respect to the second axis. Thereby, the work tool inserted into the tool insertion recess is sandwiched between the inner surface of the first recess and the inner surface of the second recess, and is fixed so as not to move in a predetermined direction. The cylindrical surface of the cylindrical portion of the work tool is in contact with the inner surface of the second recess, regardless of the presence or absence of reaction force from the cutting insert, and is pressed in advance in a direction opposite to the predetermined direction. As a result, even when the work tool receives a reaction force in a predetermined direction from the cutting insert on the cam surface, it is possible to suppress the play of the work tool.

  The inner surface of the second recess may be formed with a protrusion that protrudes toward the insert mounting portion and presses against the cylindrical surface of the cylindrical portion.

  According to this configuration, the protrusion formed on the inner surface of the second recess presses the cylindrical surface of the cylindrical portion, thereby pressing the cylindrical surface in a direction opposite to the predetermined direction. That is, the play of the work tool can be more reliably suppressed by pressing and fixing the work tool at a specific portion of the inner surface of the second recess.

  The protrusion may be formed in two portions of the inner surface of the second recess that are separated from each other around the second axis.

  According to this configuration, when the work tool is viewed along the tool axis, the work tool is supported at one place in the first recess and is supported at two places in the second recess. Thus, by supporting the work tool at a total of three locations, the play of the work tool can be more reliably suppressed.

  The size of the cylindrical portion in the direction along the tool axis is smaller than the size of the second recess in the direction along the second axis, and an opening end surface that contacts the end surface of the cam portion is formed at the end of the second recess. Also good.

  According to this configuration, the operator pushes the work tool along the tool axis, and determines the position of the work tool in the direction along the tool axis by bringing the end surface of the cam portion into contact with the opening end surface of the second recess. can do. Thereby, the play of the work tool can be further reliably suppressed.

  The tool insertion recess may fix the work tool such that the cam surface is inclined with respect to the end surface of the cutting insert.

  According to this structure, the cam surface of a work tool contacts only a part of end surface of a cutting insert. Therefore, the friction generated between the cam surface and the end surface of the cutting insert can be reduced when the adjustment of the position of the cutting edge is finished and the work tool is pulled out from the tool insertion recess. As a result, the work tool can be easily pulled out from the tool insertion recess, and the cutting insert can be restrained from moving unnecessarily during the pulling out.

  ADVANTAGE OF THE INVENTION According to this invention, the tool body which can suppress the play of a working tool can be provided.

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 an enlarged view which shows the periphery of the tool insertion recessed part of FIG. It is an enlarged view which shows the periphery of the tool insertion recessed part of FIG. It is sectional drawing which shows the periphery of the tool insertion recessed part of FIG. It is sectional drawing which shows the XI-XI cross section 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. That is, the work tool 9 and the tool body 2 constitute an adjustment mechanism.

  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 third recess 43 of the 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, and an internal thread 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. The second contact surface 62 is inclined with respect to the first contact surface 61.

  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. 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 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. 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, the wedge member 6 contacts the opposing wall surface 32 at the first contact surface 61, and contacts the front surface 50 a of the cutting insert 5 at the second contact surface 62. That is, the wedge member 6 is fitted between the front surface 50 a of the cutting insert 5 and the opposing wall surface 32.

  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.

  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, the contact between the second contact surface 62 of the wedge member 6 and the front surface 50a of the cutting insert 5 is released. As shown by an arrow S in FIG. 3, the used cutting insert 5 can be taken out from between the second contact surface 62 and the bottom surface 31 or a new cutting insert 5 can be inserted and attached.

  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 with reference to FIGS. 8 and 9 are enlarged views showing the periphery of the tool insertion recess 4. FIG. 8 shows the tool insertion recess 4 in a front view. FIG. 9 is a perspective view of the tool insertion recess 4 in which the work tool 9 is inserted. FIG. 10 is a cross-sectional view showing the periphery of the tool insertion recess 4 and shows the tool insertion recess 4 in which the work tool 9 is inserted. FIG. 10 is a cross-sectional view in a plane including a first axis C41 and a second axis C42 to be described later. FIG. 11 is a cross-sectional view showing a XI-XI cross section of FIG.

  As shown in FIGS. 8 and 10, the tool insertion recess 4 is configured by connecting a first recess 41, a second recess 42, and a third recess 43 in the radial direction. The cross-sectional shape of the 1st recessed part 41, the 2nd recessed part 42, and the 3rd recessed part 43 is substantially circular. The diameter of the second recess 42 is larger than the diameter of the first recess 41, and the diameter of the third recess 43 is larger than the diameter of the second recess 42.

  The first recess 41 and the second recess 42 extend along a first axis C41 and a second axis C42, respectively, which are virtual straight lines. The first axis C41 is substantially parallel to the second axis C42 and is a direction away from the insert mounting portion 3 relative to the second axis C42 (upward direction in FIG. 10; hereinafter, this direction is referred to as a “separating direction”. ). That is, the first recess 41 is eccentric in the separating direction from the second recess 42. The distance between the first axis C41 and the second axis C42 is, for example, about 0.5 mm. FIG. 8 exaggerates the distance to facilitate understanding of the description.

  As shown in FIG. 8, protrusions 421 and 422 are formed on the inner surface of the second recess 42. The protrusions 421 and 422 are formed in portions of the inner surface of the second recess 42 that are biased in the separating direction and spaced apart from each other around the second axis C42. The protrusions 421 and 422 extend along the second axis C42.

  In adjusting the positions of the cutting edges 51 a to 51 c, the cutting insert 5 is attached to the insert attachment portion 3 so as to be movable. Specifically, as will be described later, the cutting insert 5 is moved by being pressed against the cam surface 94a, but the fastening force of the screw member 7 is set in advance so that the moved cutting insert 5 does not fall from the insert mounting portion 3. It has been adjusted.

  The operator inserts the work tool 9 into the tool insertion recess 4 from the distal end portion 91a side. Here, the length from the cylindrical portion end surface 96 b of the cylindrical portion 96 to the distal end portion 91 a of the shaft body 91 is smaller than the depth dimension of the first recess 41. Further, the length L96 (see FIG. 6) of the cylindrical portion 96 is smaller than the depth dimension of the second recess 42. Therefore, as shown in FIG. 10, the work tool 9 is inserted until the cam end surface 94 b comes into contact with the opening end surface 42 a of the second recess 42.

  When the insertion of the work tool 9 into the tool insertion recess 4 is completed, the distal end portion 91 a of the shaft body 91 is disposed in the first recess 41 and the cylindrical portion 96 is disposed in the second recess 42. Further, the cam portion 94 is disposed in the third recess 43.

  As shown in FIG. 8, the insert mounting portion 3 communicates with the third recess 43 at the upper end 36. For this reason, when the cam portion 94 is disposed in the third recess 43, the cam surface 94 a is disposed so as to protrude to the insert mounting portion 3 via the upper end 36. At this time, as shown in FIG. 10, the cam surface 94 a is disposed so as to be inclined with respect to the upper end surface 50 c of the cutting insert 5.

  As described above, the first recess 41 is more eccentric in the separating direction than the second recess 42. For this reason, the shaft body 91 and the cylindrical portion 96 of the work tool 9 locally abut on the first recess 41 and the second recess 42.

  Specifically, as shown in FIG. 10, the shaft body 91 contacts the contact portion P <b> 1 of the first recess 41. The contact portion P <b> 1 is a portion of the inner surface of the first recess 41 that is closer to the insert mounting portion 3 and closer to the opening end surface 41 a of the first recess 41. Therefore, the shaft body 91 receives the force F1 in the separating direction from the contact portion P1.

  Further, as shown in FIGS. 10 and 11, the cylindrical portion 96 contacts the contact portions P2 and P3. The contact portions P2 and P3 are portions of the protrusions 421 and 422 near the opening end surface 42a of the second recess 42. As described above, the protrusions 421 and 422 are formed on the inner surface of the second recess 42 at a portion biased in the separation direction. Therefore, the cylindrical portion 96 receives forces F2 and F3 in the direction toward the insert mounting portion 3 (that is, the direction opposite to the separating direction).

  As described above, when the work tool 9 is inserted into the tool insertion recess 4, the inner surface of the first recess 41 is made to be the shaft body 91 because the first axis C <b> 41 is arranged in the direction away from the second axis C <b> 42. Is pressed in the separating direction. Then, the inner surface of the second recess 42 presses the cylindrical surface 96a of the cylindrical portion 96 in the direction opposite to the separating direction. As a result, the work tool 9 inserted into the tool insertion recess 4 is fixed so as not to move in the separating direction. The operator grips the grip portion 98 (see FIG. 6) of the work tool 9 and rotates it clockwise around the tool axis C9.

  When the work tool 9 rotates, the cam surface 94a comes into contact with the upper end surface 50c of the cutting insert 5, as shown in FIG. Since the cam surface 94a is disposed so as to be inclined with respect to the upper end surface 50c, the cam surface 94a contacts the upper end surface 50c only at a part thereof.

  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 in the direction opposite to the separation direction by the cam surface 94a and moves in the direction. 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. 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. 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, the effect | action by the tool body 2 and its effect are demonstrated.

  The rotating work tool 9 receives a reaction force in the separating direction from the upper end surface 50 c of the cutting insert 5. If the work tool 9 is rattled by this reaction force, it is difficult to stably press the cutting insert 5 and the adjustment accuracy may be reduced.

  Therefore, in the work tool 9, the first axis C41 is disposed in a direction away from the second axis C42. As a result, the work tool 9 inserted into the tool insertion recess 4 is sandwiched between the inner surface of the first recess 41 and the inner surface of the second recess 42 and fixed so as not to move in the separating direction. . The cylindrical surface 96a of the cylindrical portion 96 of the work tool 9 abuts against the inner surface of the second recess 42 regardless of the presence or absence of the reaction force from the cutting insert 5, and is pressed in advance in the direction opposite to the separation direction. As a result, even when the work tool 9 receives a reaction force in the separation direction from the cutting insert 5 on the cam surface 94a, the play of the work tool 9 can be suppressed.

  Projections 421 and 422 are formed on the inner side surface of the second recess 42 so as to protrude toward the insert mounting portion 3 and to come into pressure contact with the cylindrical surface 96 a of the cylindrical portion 96.

  According to this configuration, the protrusions 421 and 422 formed on the inner side surface of the second recess 42 are pressed against the cylindrical surface 96a of the cylindrical portion 96, thereby pressing the cylindrical surface 96a in the direction opposite to the separation direction. That is, the play of the work tool 9 can be more reliably suppressed by pressing and fixing the work tool 9 at a specific portion of the inner side surface of the second recess 42.

  The protrusions 421 and 422 are formed at two portions of the inner surface of the second recess 42 that are separated from each other around the second axis C42.

  According to this configuration, when the work tool 9 is viewed along the tool axis C <b> 9, the work tool 9 is supported at one place in the first recess 41 and supported at two places in the second recess 42. In this way, by supporting the work tool 9 at a total of three locations, the play of the work tool 9 can be more reliably suppressed.

  The dimension L96 of the cylindrical portion 96 in the direction along the tool axis C9 is smaller than the dimension of the second recess 42 in the direction along the second axis C42. Further, an opening end surface 42 a that contacts the cam portion end surface 94 b of the cam portion 94 may be formed at the end portion of the second recess 42.

  According to this configuration, the operator pushes the work tool 9 along the tool axis C9, and brings the cam part end surface 94b of the cam part 94 into contact with the open end surface 42c of the second recess 42, thereby causing the tool axis C9 to come into contact with the tool axis C9. The position of the work tool 9 in the direction along can be determined. Thereby, the play of the work tool 9 can be further reliably suppressed.

  The tool insertion recess 4 fixes the work tool 9 so that the cam surface 94 a is inclined with respect to the upper end surface 50 c of the cutting insert 5.

  According to this configuration, the cam surface 94 a of the work tool 9 contacts only a part of the upper end surface 50 c of the cutting insert 5. Therefore, the friction generated between the cam surface 94a and the upper end surface 50c of the cutting insert 5 can be reduced when the position adjustment of the cutting edges 51a to 51c is finished and the work tool 9 is pulled out from the tool insertion recess 4. . As a result, the work tool 9 can be easily pulled out from the tool insertion recess 4, and the cutting insert 5 can be prevented from moving unnecessarily during the pulling out.

  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 4: Tool insertion concave portion 41: First concave portion 42: Second concave portion 421: Protrusion 422: Protrusion 43: Third concave portion 5: Cutting inserts 51a to 51c: Cutting edge 9: Work tool 91: Shaft body 91a: Tip portion 94: Cam portion 94a: Cam surface 94b: Cam portion end surface 96: Column portion 98: Grasping portion

Claims (5)

A tool body of a cutting tool,
An insert mounting portion to which a cutting insert is mounted;
A cam insertion recess that is arranged in a predetermined direction with respect to the insert mounting portion, and is formed with a substantially cylindrical shaft body extending along the tool axis, and a cam surface in which the distance from the tool axis gradually changes. A tool insertion recess into which a work tool is inserted, and a columnar portion formed between the tip of the shaft body and the cam portion and having a cylindrical surface whose diameter is larger than the diameter of the shaft body And formed,
The tool insertion recess is
A first recess that extends along the first axis and in which the tip of the shaft is disposed;
Extending along a second axis, and having a second recess in which the cylindrical portion is disposed,
Since the first axis is arranged in the predetermined direction with respect to the second axis, when the work tool is inserted, the shaft body is pressed in the predetermined direction on the inner surface of the first recess, A tool body that presses a cylindrical surface of the cylindrical portion in a direction opposite to the predetermined direction on an inner surface of the second recess, and fixes the work tool in the predetermined direction.   2. The tool body according to claim 1, wherein an inner surface of the second recess is formed with a protrusion that protrudes toward the insert mounting portion and presses against a cylindrical surface of the cylindrical portion.   3. The tool body according to claim 2, wherein the protrusion is formed at two portions of the inner side surface of the second recess that are separated from each other around the second axis. The dimension of the cylindrical part in the direction along the tool axis is smaller than the dimension of the second recess in the direction along the second axis,
The tool body according to any one of claims 1 to 3, wherein an opening end surface that contacts the end surface of the cam portion is formed at an end portion of the second recess.   The tool body according to any one of claims 1 to 4, wherein the tool insertion recess fixes the work tool so that the cam surface is inclined with respect to an end surface of the cutting insert.