Clamp structure and cutting tool

Abstract

To provide a clamp structure and a cutting tool capable of firmly clamping a cutting insert to a tool body.SOLUTION: A clamp structure includes: a clamping jig 13 for pressing a cutting insert 12 against a seat surface 33 of a mounting seat 32; an anvil 15 for pressing the cutting insert 12 against a restraining surface 34 of the mounting seat 32; a screw member 14 having a tapered portion 58 at its tip and threaded into a tool body 11 to draw the clamping jig 13 toward the tool body 11; and a pin member 16 having an engagement hole 65 that engages with the tapered portion 58 of the screw member 14, and being pulled into the tool body 11 by inserting the tapered portion 58 of the screw member 14 into the engagement hole 65 to draw the anvil 15 toward the tool body 11. The cutting insert 12 is pressed against the seat surface 33 and the restraint surface 34 of the mounting seat 32 from different directions by the clamping jig 13 and the anvil 15 which are drawn to the tool body 11, and is then clamped.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a clamping structure and a cutting tool. [Background technology]

[0002] Patent Document 1 discloses a clamping device that clamps a cutting insert to a tip seat of a tool body. In this clamping device, a screw member is screwed into a threaded hole formed in the front face of the tool body, which causes a clamping member engaged with the screw member to be pulled in obliquely, and the cutting insert, which is engaged by a clamping portion of the clamping member, is clamped to the tip seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5800017 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the clamping device described above has a structure in which the fastening force of the screw member screwed into the screw hole is converted into a force that clamps the cutting insert by obliquely pulling the clamping member in. As a result, the cutting insert is not sufficiently clamped in the direction of the screw member's advancement, which is the direction of the fastening force of the screw member, and there is a risk of the cutting insert becoming misaligned during high-load machining, such as when rough machining a heat-resistant alloy.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a clamping structure and a cutting tool that can firmly clamp a cutting insert to a tool body. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the clamping structure of the present invention is a clamping structure that presses a cutting insert against the seat surface and restraint surface of a mounting seat to clamp it to a tool body, and is equipped with a clamping jig for pressing the cutting insert against the seat surface of the mounting seat, an anvil for pressing the cutting insert against the restraint surface of the mounting seat, a screw member having a tapered portion at its tip and being screwed into the tool body to draw the clamping jig or anvil toward the tool body, and a pin member having an engaging portion consisting of a hole or groove that engages with the tapered portion of the screw member, and being pulled into the tool body when the tapered portion of the screw member is inserted into the engaging portion to pull the anvil or clamping jig toward the tool body, and the cutting insert is pressed against the seat surface and restraint surface of the mounting seat from different directions by the clamping jig and anvil that are pulled toward the tool body, thereby being clamped.

[0007] According to this clamping structure, by screwing the screw member into the tool body, the clamping jig and the anvil are pulled toward the tool body, and the clamping jig and the anvil press the cutting insert against the seat surface and the restraining surface of the mounting seat from different directions to clamp it. This firmly clamps the cutting insert to the tool body and prevents the cutting insert from slipping during machining of the workpiece, making it suitable for high-load machining such as rough machining of heat-resistant alloys.

[0008] In the clamp structure of the present invention, the anvil may be formed in a plate shape.

[0009] According to this clamping structure, the plate-shaped anvil can be pulled toward the tool body, and the cutting insert can be pressed against the tool body together with the clamping jig.

[0010] In the clamp structure of the present invention, the anvil may have a block portion having a seat surface of the mounting seat, and a wall portion that presses the cutting insert.

[0011] With this clamping structure, the anvil can be pulled toward the tool body with the cutting insert placed on the anvil seat, and the wall of the anvil together with the clamping jig can press the cutting insert against the tool body. Also, since the seat of the mounting seat is provided on the anvil, the structure of the tool body can be simplified and costs can be reduced.

[0012] In the clamp structure of the present invention, the pin member may include a screw pin having an engagement portion, and a connecting member that threadably engages with the anvil and the screw pin, respectively.

[0013] According to this clamping structure, by adjusting the amount of threading of the connecting member into the anvil and the amount of threading of the screw pin into the connecting member, it is possible to adjust the pressing force of the clamping jig and the anvil on the cutting insert when the screw member is threaded in. This allows the clamping jig and the anvil to clamp the cutting insert to the tool body in a balanced manner.

[0014] In the clamp structure of the present invention, the anvil may be in contact with the peripheral surface of the cutting insert on both sides of the center of the cutting insert.

[0015] According to this clamping structure, the cutting insert can be pressed in a balanced manner by the anvil and clamped to the tool body.

[0016] In addition, the drilling tool of the present invention has a cutting insert fixed to the tool body by any one of the clamp structures described above.

[0017] This cutting tool allows the cutting insert to be firmly clamped to the tool body, preventing the cutting insert from slipping during machining of the workpiece, thereby providing a cutting tool suitable for high-load machining, such as rough machining of heat-resistant alloys. [Effects of the Invention]

[0018] According to the present invention, there are provided a clamping structure and a cutting tool capable of firmly clamping a cutting insert to a tool body. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a cutting tool according to a first embodiment. [Figure 2] FIG. 2 is a side view of the cutting tool according to the first embodiment. [Figure 3(a)] FIG. 3(a) is a perspective view of the cutting insert as viewed from the bottom side. [Figure 3(b)] FIG. 3(b) is a perspective view of the cutting insert according to the modified example, as viewed from the bottom side. [Figure 4] FIG. 4 is a front view of the tool body. [Figure 5] FIG. 5 is a top view of the tool body. [Figure 6] FIG. 6 is a side view of the screw member. [Figure 7] FIG. 7 is a perspective view of the anvil as viewed from the front side. [Figure 8] FIG. 8 is a perspective view of the anvil as viewed from the rear side. [Figure 9] FIG. 9 is a perspective view of the pin member. [Figure 10] FIG. 10 is a perspective view of a mounting screw for securing the pin member to the anvil. [Figure 11] FIG. 11 is a perspective view of a cutting tool according to the second embodiment. [Figure 12] FIG. 12 is a side view of the cutting tool according to the second embodiment. [Figure 13] FIG. 13 is a front view of the tool body. [Figure 14] FIG. 14 is a top view of the tool body. [Figure 15] FIG. 15 is a perspective view of the screw member, the anvil, and the pin member. [Figure 16] FIG. 16 is a perspective view of a screw pin that constitutes the pin member. [Figure 17]FIG. 17 is a perspective view of the connecting member that constitutes the pin member, as viewed from the front side. [Figure 18] FIG. 18 is a perspective view of the connecting member that constitutes the pin member, as viewed from the rear side. [Figure 19] FIG. 19 is a side view of a cutting insert according to the first modification. [Figure 20] FIG. 20 is a plan view of a cutting insert according to the second modification. [Figure 21] FIG. 21 is a side view of a cutting insert according to the second modification. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0021] First Embodiment First, a clamping structure and a cutting tool according to a first embodiment will be described.

[0022] (cutting tools) As shown in FIGS. 1 and 2 , the clamp structure according to the first embodiment is applied to a cutting tool 100. The cutting tool 100 has a tool body 11 and a cutting insert 12. The cutting insert 12 is attached to the tip of the tool body 11. The cutting tool 100 is a tool that cuts a rotating workpiece using the cutting insert 12 attached to the tip of the tool body 11, and is used, for example, when cutting the outer diameter or inner diameter of the workpiece. Hereinafter, the front of the tool body 11 will be referred to as the front, the rear of the tool body 11 as the rear, the top of the tool body 11 as the top, and the bottom of the tool body 11 as the bottom.

[0023] The tool body 11 of the cutting tool 100 has a clamping jig 13, a screw member 14, an anvil 15, and a pin member 16. The cutting insert 12 is clamped and attached to the tool body 11 by the clamping jig 13, the anvil 14, the screw member 15, and the pin member 16.

[0024] As shown in FIG. 3(a), the cutting insert 12 is formed in a circular shape in a plan view. The cutting insert 12 has an insert body 22 whose upper edge portion is a cutting edge 21 along the entire circumference, and a fixing portion 23 formed at the bottom of the insert body 22. The insert body 22 gradually reduces in diameter downward, and the fixing portion 23 is formed in a cylindrical shape with a smaller diameter than the insert body 22. The cutting insert 12 has a top surface 12a and a bottom surface 12b which are flat. Note that the top surface 12a of the cutting insert 12 may be recessed. The fixed portion 23 may also be formed in a polygonal prism shape, such as a triangular prism or a square prism, or may have multiple flat portions. For example, if the cutting edge 21 is circular when viewed from the rake face, if the cutting edge is damaged, the cutting insert 12 can be rotated circumferentially to use the cutting edge 21 other than the damaged portion. However, if the fixed portion 23 is formed in a polygonal prism shape or has multiple flat portions equally spaced circumferentially, the fixed portion 23 can be used at a constant rotation angle. For example, if the fixed portion 23 is triangular prism-shaped, it can be rotated circumferentially in 120-degree increments, and if it is square prism-shaped, it can be rotated circumferentially in 90-degree increments. Similarly, if the fixed portion 23 has three flat portions, it can be rotated circumferentially in 120-degree increments, and if it has four flat portions, it can be rotated circumferentially in 90-degree increments. Figure 3(b) shows an example of a cutting insert 120 whose fixed portion 230 has four flat portions 230a, 230b, 230c, and 230d.

[0025] As shown in FIGS. 4 and 5, the tool body 11 has an insert mounting portion 31 at its tip, and the cutting insert 12 is attached to this insert mounting portion 31.

[0026] The insert mounting portion 31 has a mounting seat 32. The mounting seat 32 has a seat surface 33 and a restraint surface 34. The restraint surface 34 is a vertical surface provided on the rear side of the seat surface 33, and is formed in a substantially V-shape in a plan view. The seat surface 33 has a recess 33a at its center. By forming the recess 33a at the center of the seat surface 33 in this way, it is possible to avoid a problem in which the center of the seat surface 33 becomes slightly higher when machining the seat surface 33, causing the posture of the cutting insert 12 placed on the seat surface 33 to become unstable.

[0027] The fixing portion 23 of the cutting insert 12 is disposed in a portion surrounded by the seat surface 33 and the restraint surface 34 of the mounting seat 32. As a result, the bottom surface 12b of the cutting insert 12 abuts against the seat surface 33, and the peripheral surface 23a of the fixing portion 23 abuts against the restraint surface 34. In addition, a side wall 35 having an arc shape in a plan view is formed on the rear side of the restraint surface 34 of the mounting seat 32, and the insert body 22 of the cutting insert 12 is disposed on the front side of this side wall 35.

[0028] The insert mounting portion 31 has a clamp fixing portion 36 on the rear side of the mounting seat 32, and the clamp jig 13 is attached to this clamp fixing portion 36. This clamp fixing portion 36 has a locking groove 37 on its rear side.

[0029] The insert mounting part 31 has an anvil fixing part 38 at the tip below the mounting seat 32. The anvil fixing part 38 is a recess formed in the insert mounting part 31, and the anvil 14 is attached to the anvil fixing part 38. The central part of the anvil fixing part 38 in the width direction of the tool body 11 protrudes slightly forward to maximize the area of ​​the bearing surface 33 of the mounting seat 32.

[0030] The insert mounting portion 31 has a threaded hole 41. The threaded hole 41 has an internal thread 41a and is formed downward from the clamp fixing portion 36. The lower end of the threaded hole 41 is formed as a small-diameter hole portion 42 without an internal thread (see FIGS. 1 and 2). The insert mounting portion 31 also has an insertion hole 45. The insertion hole 45 is formed in the vertical surface 38a that forms the anvil fixing portion 38, and is formed from this vertical surface 38a toward the rear. In the insert mounting portion 31, the small-diameter hole portion 42 of the threaded hole 41 and the insertion hole 45 communicate with each other so as to intersect (see FIGS. 1 and 2).

[0031] 1 and 2, the clamp jig 13 is formed in a block shape, and has a mounting hole 51 formed in its center portion, which penetrates vertically. The clamp jig 13 has a pressing claw 52 protruding downward at the bottom of its leading end, and a locking claw 53 protruding downward at the bottom of its rear end. The clamp jig 13 is assembled to the clamp fixing portion 36 of the insert mounting portion 31. As a result, the pressing claw 52 of the clamp jig 13 abuts against the upper surface 12a of the cutting insert 12 placed in the mounting seat 32, and the locking claw 53 is locked in the locking groove 37 of the clamp fixing portion 36.

[0032] 6, the screw member 14 has a shank 55 having a male thread 55a on its outer periphery, and a large-diameter head 56 formed at the end of the shank 55. A tool hole 56a is formed in the head 56, into which a tool such as a hex wrench can be engaged. The screw member 14 also has a small-diameter portion 57 formed with a small diameter at the tip of the shank 55, and this small-diameter portion 57 has a tapered portion 58 that gradually narrows toward the tip.

[0033] The screw member 14 is inserted from above into the mounting hole 51 of the clamp jig 13 arranged in the clamp fixing portion 36 of the tool body 11 , and is screwed into the threaded hole 41 formed in the tool body 11 .

[0034] 7 and 8, the anvil 15 is formed in a plate shape. The anvil 15 has a recess 61 on the upper end side where it is attached to the insert attachment portion 31. As a result, the anvil 15 has contact portions 62 formed of ridges that protrude in the direction of attachment to the insert attachment portion 31, formed on both edges thereof. The anvil 15 also has an attachment hole 63 on its lower end side.

[0035] 9, the pin member 16 is formed in a cylindrical shape, and a female thread 16a is formed on the inner periphery thereof. The pin member 16 has an engagement hole (engagement portion) 65 at one end. The engagement hole 65 is formed in a direction perpendicular to the axis of the pin member 16.

[0036] The pin member 16 is fixed to the anvil 15 by a mounting screw 67 (see FIG. 1). As shown in FIG. 10, the mounting screw 67 has a shaft portion 68 with a male thread 68a and a large-diameter head portion 69 formed at the end of the shaft portion 68. The head portion 69 is formed with a tool hole 69a into which a tool such as a hex wrench can be engaged.

[0037] The mounting screw 67 is inserted into the mounting hole 63 of the anvil 15 from the front side and is screwed into the female thread 16a from one end side of the pin member 16. In this way, the pin member 16 is fixed to the anvil 15.

[0038] (Fixing cutting inserts) Next, a case where the cutting insert 12 is fixed to the insert mounting portion 31 of the tool body 11 will be described.

[0039] The pin member 16 fixed to the anvil 15 is inserted into the insertion hole 45 of the insert mounting portion 31 , the anvil 15 is placed on the anvil fixing portion 38 , and the cutting insert 12 is placed on the mounting seat 32 .

[0040] The clamp jig 13 is placed on the clamp fixing portion 36 of the insert mounting portion 31. Then, the pressing claws 52 of the clamp jig 13 are brought into contact with the upper surface 12a of the cutting insert 12, and the locking claws 53 are locked in the locking grooves 37 of the clamp fixing portion 36.

[0041] The screw member 14 is inserted into the mounting hole 51 of the clamp jig 13 and screwed into the threaded hole 41. The tapered portion 58 at the tip of the screw member 14 is then inserted into the engagement hole 65 of the pin member 16. The tapered portion 58 of the screw member 14 then slides into the inner edge of the engagement hole 65 of the pin member 16, causing the pin member 16 to be pulled toward the rear side of the tool body 11, and the anvil 15 to be drawn toward the tool body 11. As a result, the fixing portion 23 of the cutting insert 12 is pressed by the abutting portion 62 of the anvil 15 and pressed against the constraint surface 34. The abutting portions 62 are provided at two locations on both sides of the anvil 15, and the constraint surface 34 is formed in a substantially V-shape in a plan view. Therefore, the anvil 15 and the constraint surface 34 each come into contact with and press against the circumferential surface 23a of the fixing portion 23 of the cutting insert 12 at two points. This allows the fixing portion 23 of the cutting insert 12 to be clamped in a balanced manner by the restraining surface 34 and the abutting portion 62.

[0042] Furthermore, when the screw member 14 is screwed into the screw hole 41, the screw member 14 draws the clamping jig 13 toward the tool body 11. As a result, the upper surface 12a of the cutting insert 12 is pressed by the pressing claws 52 of the clamping jig 13, and the bottom surface 12b is pressed against the seat surface 33 of the mounting seat 32. Therefore, the cutting insert 12 is pressed from above by the clamping jig 13 against the seat surface 33 of the mounting seat 32, and is also pressed from the front by the anvil 15 against the restraint surface 34, so that the cutting insert 12 is firmly clamped to the mounting seat 32.

[0043] As described above, with the clamping structure and cutting tool 100 according to the first embodiment, by screwing the screw member 14 into the tool body 11, the clamping jig 13 and the anvil 15 are drawn toward the tool body 11, respectively, and the clamping jig 13 and the anvil 15 press the cutting insert 12 against the seat surface 33 and the restraining surface 34 of the mounting seat 32 from different directions to clamp the cutting insert 12. This allows the cutting insert 12 to be firmly clamped to the tool body 11, preventing the cutting insert 12 from shifting during machining of the workpiece, and is suitable for high-load machining such as rough machining of heat-resistant alloys, for example.

[0044] For example, in order to firmly clamp the cutting insert 12, there is a structure in which the bottom surface 12b of the cutting insert 12 and the seat surface 33 of the mounting seat 32 are fitted together in a V-shape. However, with this structure, the cutting insert 12 can only be attached by switching the orientation of the cutting insert 12 between the front and rear, and only cutting inserts 12 having cutting edges 21 at two locations, the front and the rear, can be attached. In this embodiment, the cutting insert 12 can be firmly clamped even if the bottom surface 12b of the cutting insert 12 and the seat surface 33 of the mounting seat 32 are flat. In other words, the entire circumference of the upper edge portion of the insert body 22 is made into the cutting edge 21, and an economical cutting insert 12 can be used in which this cutting edge 21 can be used over the entire circumference.

[0045] Second Embodiment Next, a second embodiment will be described. The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. As shown in FIGS. 11 and 12, the clamp structure according to the second embodiment is applied to a cutting tool 200.

[0046] (cutting tools) The cutting tool 200 according to the second embodiment includes an anvil 15A and a pin member 16A that are different from those of the cutting tool 100 according to the first embodiment.

[0047] 13 and 14, the tool body 11A constituting the cutting tool 200 has an anvil accommodating recess 47 in the insert attachment portion 31, and the anvil 15A is accommodated in this anvil accommodating recess 47. In addition, in the tool body 11A, an insertion hole 45 is formed in a vertical surface 47a constituting the anvil accommodating recess 47. A portion of the upper side of the vertical surface 47a constituting the anvil accommodating recess 47 serves as the restraint surface 34.

[0048] As shown in FIG. 15 , the anvil 15A accommodated in the anvil accommodating recess 47 has a block portion 71 and a pressing wall portion (wall portion) 72. The block portion 71 has an upper surface serving as a seat surface 73. That is, in the cutting tool 200, the seat surface 73 of the block portion 71 of the anvil 15A and the restraint surface 34 of the tool body 11A form the mounting seat 32 on which the cutting insert 12 is attached. The pressing wall portion 72 is integrally formed on the front portion of the block portion 71 and protrudes upward. This pressing wall portion 72 is formed in a substantially V-shape in a plan view, and the surface on the seat surface 73 side serves as a contact surface 72a. Furthermore, the anvil 15A is provided with a screw hole 74 having an internal thread. This screw hole 74 is formed in the block portion 71 of the anvil 15A and penetrates it in the front-rear direction. Further, a relief recess 73 a for preventing interference with the fixing portion 23 of the cutting insert 12 is formed at the corner of the seat surface 73 where it meets the pressing wall portion 72 .

[0049] The pin member 16A has a threaded pin 81 and a connecting member 82. As shown in Fig. 16, the threaded pin 81 has an engagement hole (engagement portion) 83 perpendicular to the axis, and is integrally formed with a threaded portion 84 having a male thread 84a. As shown in Figs. 17 and 18, the connecting member 82 has a male thread 82a on its outer periphery. The connecting member 82 also has a female thread 82b on one end and a tool hole 82c on the other end into which a tool such as a hex wrench can be engaged.

[0050] The threaded portion 84 of the screw pin 81 is threadedly engaged with the internal thread 82b of the connecting member 82. The connecting member 82 is also threadedly engaged with the threaded hole 74 formed in the anvil 15A. This connects the pin member 16A, to which the screw pin 81 is connected, to the connecting member 82, to the anvil 15A. In this connected state, when the connecting member 82 is rotated relative to the anvil 15A, the connecting member 82 moves relative to the anvil 15A. Furthermore, when the connecting member 82 is rotated, the screw pin 81 moves relative to the connecting member 82 in the direction opposite to the movement direction of the connecting member 82.

[0051] Here, the thread pitch of the male thread 84a of the threaded portion 84 of the threaded pin 81 and the female thread 82b of the connecting member 82 is smaller than the thread pitch of the male thread 82a of the connecting member 82 and the female thread of the threaded hole 74 of the anvil 15A. As a result, when the connecting member 82 is rotated relative to the anvil 15A, the movement amount of the threaded pin 81 relative to the connecting member 82 is greater than the movement amount of the connecting member 82 relative to the anvil 15A. In other words, when the connecting member 82 is rotated relative to the anvil 15A and the connecting member 82 moves rearward, the threaded pin 81 moves forward, toward the anvil 15A, by a distance greater than the movement amount. Therefore, in this anvil 15A, by rotating the connecting member 82, the threaded member 81 is moved, and the position of the engagement hole 83 of the threaded pin 81 is adjusted relative to the anvil 15A.

[0052] (Fixing cutting inserts) Next, a case where the cutting insert 12 is fixed to the insert mounting portion 31 of the tool body 11A will be described.

[0053] The pin member 16A fixed to the anvil 15A is inserted into the insertion hole 45 of the insert mounting portion 31, and the anvil 15A is fitted and positioned in the anvil accommodating recess 47. Furthermore, the cutting insert 12 is positioned in the mounting seat 32 consisting of the seat surface 73 of the block portion 71 of the anvil 15A and the restraint surface 34 of the tool body 11A.

[0054] The clamp jig 13 is placed on the clamp fixing portion 36 , the pressing claws 52 of the clamp jig 13 are brought into contact with the upper surface 12 a of the cutting insert 12 , and the locking claws 53 are locked into the locking grooves 37 of the clamp fixing portion 36 .

[0055] The screw member 14 is inserted into the mounting hole 51 of the clamp jig 13 and screwed into the threaded hole 41. Then, the tapered portion 58 at the tip of the screw member 14 is inserted into the engagement hole 83 of the screw pin 81 constituting the pin member 16A. Then, the tapered portion 58 of the screw member 14 slides into the inner edge of the engagement hole 83 of the pin member 16A, thereby drawing the pin member 16A toward the rear side of the tool body 11A and drawing the anvil 15A toward the tool body 11A. As a result, the fixing portion 23 of the cutting insert 12 is pressed by the abutting surface 72a of the pressing wall portion 72 of the anvil 15A and pressed against the restraining surface 34. Here, the abutting surface 72a of the pressing wall portion 72 and the restraining surface 34 are formed in a substantially V-shape in a plan view, and therefore contact and press the peripheral surface 23a of the fixing portion 23 of the cutting insert 12 at two points. This allows the fixing portion 23 of the cutting insert 12 to be clamped in a well-balanced manner by the restraining surface 34 and the abutting surface 72a.

[0056] Furthermore, when the screw member 14 is screwed into the screw hole 41, the clamping jig 13 is pulled toward the tool body 11A by the screw member 14. As a result, the upper surface 12a of the cutting insert 12 is pressed by the pressing claws 52 of the clamping jig 13, and the bottom surface 12b is pressed against the seat surface 73 of the anvil 15A that constitutes the mounting seat 32. Therefore, the cutting insert 12 is pressed from above by the clamping jig 13 against the seat surface 73 of the mounting seat 32, and is pressed from the front by the anvil 15A against the restraint surface 34, so that the cutting insert 12 is firmly clamped to the mounting seat 32.

[0057] As described above, in the clamping structure and cutting tool 200 according to the second embodiment, by screwing the screw member 14 into the tool body 11A, the clamping jig 13 and the anvil 15A are drawn toward the tool body 11A, respectively, and the clamping jig 13 and the anvil 15A press the cutting insert 12 against the seat surface 73 and the restraining surface 34 of the mounting seat 32 from different directions to clamp the cutting insert 12. This allows the cutting insert 12 to be firmly clamped to the tool body 11A, preventing the cutting insert 12 from shifting during machining of the workpiece, which is suitable for high-load machining such as rough machining of heat-resistant alloys, for example.

[0058] In the above embodiment, the tapered portion 58 of the screw member 14 is configured to engage with the engagement holes 65, 83 of the pin members 16, 16A, but the pin members 16, 16A may also be formed with a groove portion into which the tapered portion 58 of the screw member 14 engages.

[0059] In addition, in the above embodiment, a structure is exemplified in which the pin members 16, 16A of the anvils 15, 15A are retracted by fastening the clamp member 13 to the tool body 11, 11A with the screw member 14, but a structure in which a pin member is provided on the clamp member 13 and the anvils 15, 15A are fastened to the tool body 11, 11A with the screw member to retract the pin member of the clamp member 13 into the tool body 11, 11A may also be used.

[0060] The cutting insert 12 clamped to the cutting tool 11, 11A is not limited to the one exemplified in the above embodiment, and various types can be used.

[0061] Here, modified examples of the cutting insert will be described. (Variation 1) 19, the cutting insert 12A according to the first modification has cutting edges 21 on both upper and lower edge portions of the insert body 22 along the entire circumference, and has fixing portions 23 on the top and bottom of the insert body 22. By turning the cutting insert 12A upside down, the cutting edges 21 formed by both edge portions of the insert body 22 can be used.

[0062] (Variation 2) 20 and 21, the cutting insert 12B according to the second modification has a diamond-shaped insert body 22 in a plan view. As described above, the insert body 22 is not limited to a circular shape in a plan view, and may be a polygonal shape such as a diamond shape. [Explanation of symbols]

[0063] 11,11A Tool body 12 Cutting insert 13 Clamp jig 14 Screw member 15,15A Anvil 16,16A Pin member 32 Mounting seat 33,73 seat 34 Restraint surface 58 Tapered section 65,83 Engagement hole (engagement part) 71 Block section 72 Pressurized wall (wall) 81 Screw pin 82 Connecting member 100,200 cutting tools

Claims

1. A clamping structure that clamps the cutting insert to the tool body by pressing the cutting insert against the seat surface and the restraining surface of the mounting seat, a clamping jig for pressing the cutting insert against the seat surface of the mounting seat; an anvil for pressing the cutting insert against the restraining surface of the mounting seat; a screw member having a tapered portion at a tip end and screwed into the tool body to pull the clamp jig or the anvil toward the tool body; a pin member having an engaging portion formed of a hole or a groove that engages with the tapered portion of the screw member, and that is drawn into the tool body when the tapered portion of the screw member is inserted into the engaging portion, thereby drawing the anvil or the clamp jig to the tool body; Equipped with the cutting insert is pressed against the seat surface and the restraint surface of the mounting seat from different directions by the clamping jig and the anvil, which are attracted to the tool body, and is clamped; Clamp structure.

2. The anvil is formed in a plate shape. The clamping structure according to claim 1 .

3. The anvil includes a block portion having the seat surface of the mounting seat, a wall portion that presses the cutting insert, and having The clamping structure according to claim 1 .

4. The pin member is a threaded pin having the engagement portion; a connecting member that is threadably engaged with the anvil and the screw pin, respectively; having The clamping structure according to claim 1 .

5. The anvil abuts against the peripheral surface of the cutting insert on both sides of the center of the cutting insert. The clamping structure according to claim 1 .

6. The cutting insert is fixed to the tool body by the clamp structure according to any one of claims 1 to 5. cutting tools.

Images