JPWO2020137571A1 - Tip holders, chamfering machines, and cutting tips - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chamfering machine capable of changing a cutting edge contact angle without exchanging a tip holding member. A tip holding member (16) in a chamfering machine (1) has a tip fixing recess (34) capable of selectively fixing a thick cutting tip (30) and a thin cutting tip (32) to a tip (28) thereof. The tip fixing recess 34 has a first side surface 38 that engages with the peripheral surface 30b of the thick cutting tip 30, and a second side surface 40 that engages with the peripheral surface 32b of the thin cutting tip 32. The second side surface 40 is formed so as to project from the first side surface 38 on the side where the cutting edge 32d of the thin cutting tip 32 projects to the outside of the tip portion 28. By replacing the cutting tips 30 and 32 with different thicknesses, the position of the cutting edge in the rotation direction can be changed and the contact angle of the cutting edge can be changed. Further, the thin cutting tip 32 is fixed at a position shifted to the side of the cutting edge 32d by the second side surface 40, and the locus T2 of the cutting edge 32d and the locus T2 of the cutting edge 30d of the thick cutting tip 30 are substantially the same.

Description

The present invention is a chamfering machine in which the tool body is guided in parallel with the corners of the work material while rotating the cutting tip to chamfer the corners with the cutting tip, and the cutting tip in such a chamfering machine. The present invention relates to a tip holding member that holds and is rotationally driven, and a cutting tip that is held by the tip holding member.

For example, as shown in Patent Document 1, the chamfering machine is mounted on a tool body having a built-in motor, a tip holding member (cutting tool support) which is driven and connected to the motor and is rotationally driven, and a work material. It is provided with a guide for holding the relative position of the tool body with respect to the work material. A predetermined cutting tip is fixed to the tip holding member, and the tip holding member is rotationally driven around the rotation center axis, so that the cutting tip is also rotated about the rotation center axis. In such a chamfering machine, the tool body is guided in parallel with the corners of the work material while rotating the cutting tip, so that the cutting tip cuts the corners of the work material and chamfering is performed. It has become like.

The cutting tip has a cutting edge between the top surface and the inclined peripheral surface, and the angle of the top surface with respect to the work material when the cutting edge hits the work material at the deepest position (hereinafter, the cutting edge). It is known that the contact angle) greatly affects the life of the cutting edge. For example, the optimum cutting edge contact angle when chamfering an iron material is smaller than the optimum cutting edge contact angle when chamfering a stainless steel material. Therefore, it is desirable to change the cutting edge contact angle of the cutting tip according to the material of the work material.

Japanese Patent No. 3707519

The cutting edge contact angle of the cutting tip is determined by the position and posture in which the cutting tip is mounted on the tip holding member. That is, it is determined by the shape of the chip fixing recess provided in the chip holding member. Therefore, in the conventional chamfering machine, it is necessary to replace the tip holding member in order to change the cutting edge contact angle. However, in order to replace the tip holding member, it is necessary to disassemble a part of the tool body, and the replacement work is complicated.

Therefore, the present invention provides a chamfering machine capable of changing the cutting edge contact angle without exchanging the tip holding member, a tip holding member in the chamfering machine, and a cutting tip fixed to the tip holding member. With the goal.

That is, the present invention
In a chamfering machine in which the tool body is guided along the corners of the work material while rotating the cutting tip to chamfer the corners with the cutting tip, the cutting tip is held and the tool is held. It is a chip holding member that is driven and connected to the rotation drive unit of the main body and is rotationally driven around the rotation center axis.
A base portion that is driven and connected to the rotation drive portion of the chamfering machine and a tip portion that is opposite to the base portion in the direction of the rotation center axis are provided.
A first cutting tip having a cutting edge on the peripheral edge of the top surface and a second cutting tip having a cutting edge on the peripheral edge of the top surface and thinner than the first cutting tip, at least a part of the cutting edge. It has a tip fixing recess that selectively fixes it so that it protrudes to the outside of the tip and can engage with the corners of the work material.
The tip fixing recess is a seating surface that faces the rotational direction of the tip holding member and engages with the bottom surfaces of the first and second cutting tips, and the seating surface that engages with the peripheral surface of the first cutting tip. Positioning of the second cutting tip in a direction parallel to the seating surface by engaging with the peripheral surface of the second cutting tip and the first side surface for positioning the first cutting tip in a direction parallel to the surface. The cutting edge of the second cutting tip when fixed to the tip fixing recess is located behind the cutting edge of the first cutting tip in the rotational direction. Being done
Provided is a tip holding member in which the second side surface is formed so as to project with respect to the first side surface on a side where at least a part of the cutting edge protrudes to the outside of the tip portion.

In the tip holding member, the first cutting tip and the second cutting tip having different thicknesses can be selectively fixed, and the position of the cutting edge changes in the front-back direction in the rotation direction by exchanging the cutting tips. It has become like. Thereby, the angle when the cutting edge comes into contact with the work material (the cutting edge contact angle) can be changed. Here, when the cutting tips are simply replaced with cutting tips having different thicknesses, not only the position of the cutting edge in the rotation direction but also the distance from the center axis of rotation to the cutting edge changes, which greatly changes the chamfering amount. On the other hand, in the tip holding member, the thick first cutting tip and the thin second cutting tip are positioned by different side surfaces, and the second cutting tip has a cutting edge as compared with the thick first cutting tip. Is fixed at a position shifted to the side protruding outward from the tip. As a result, it is possible to reduce the amount of change in the distance from the rotation center axis to the cutting edge when the cutting tip is replaced, and to reduce the deviation in the chamfering amount when the cutting tip is replaced.

Preferably, when the tip holding member is rotated, a circular locus drawn by a portion of the cutting edge projecting to the outside of the tip portion of the first cutting tip fixed to the tip fixing recess, and the tip fixing recess. The first and second side surfaces are shaped so as to substantially coincide with the circular locus drawn by the portion of the cutting edge protruding outward from the tip of the second cutting tip fixed to. be able to.

With such a configuration, the chamfering amount does not change even if the cutting tip is replaced, and it is not necessary to adjust the chamfering amount again when the cutting tip is replaced.

Further, each of the first and second cutting tips has an insertion hole penetrating from the top surface to the bottom surface.
The seating surface has a screw hole into which a fixing screw passed through the insertion hole of the first and second cutting tips is screwed, and the fixing screw is screwed into the screw hole through the insertion hole. At that time, the first and second cutting tips can be fixed to the tip fixing recess in a state of being pressed against the first and second side surfaces by the fixing screw, respectively.

Further, the first and second cuttings are made so that the top surface and the bottom surface of the first and second cutting tips have a regular polygonal shape and the central axis of the insertion hole passes through the center of the top surface and the bottom surface. The insertion hole of the tip is formed,
The central axis of the insertion hole of the second cutting tip when fixed in the tip fixing recess is more than the central axis of the insertion hole of the first cutting tip when fixed in the tip fixing recess. The first and second side surfaces may be shaped so as to be at a position significantly deviated from the central axis of the fixing screw on the side of the cutting edge portion protruding outward from the tip portion.

With such a configuration, a plurality of cutting edges can be obtained with one cutting tip, and by rotating and attaching the cutting tip, it is possible to perform chamfering with a new cutting edge without changing the position of the cutting edge. Become.

Further, the peripheral surfaces of the first and second cutting tips have a regular polygonal cross section and have a plurality of flat surfaces.
The first and second side surfaces of the tip fixing recess can be made to engage at least two planar portions of the peripheral surface of the first and second cutting tips.

With such a configuration, positioning in a direction parallel to the seating surface of the cutting tip can be performed more stably.

Another object of the present invention is to provide a chamfering machine including any of the above-mentioned chip holding members.

Further, the present invention is a cutting tip fixed to any of the above-mentioned tip holding members, the bottom surface engaging with the seating surface, the top surface parallel to the bottom surface, and the bottom surface toward the top surface. A contact surface portion that has a peripheral surface that is inclined to the outside of the cutting tip and extends to form a cutting edge between the cutting tip and the top surface, and the peripheral surface abuts on the first side surface of the chip holding member. Provided is a cutting tip having a recessed portion so as not to come into contact with the second side surface at a position facing the second side surface of the tip holding member.

Further, the present invention is a set of cutting tips including the first and second cutting tips fixed to any of the above-mentioned tip holding members.
A first bottom surface in which the first cutting tip engages with the seating surface, a first top surface parallel to the first bottom surface, and the first cutting tip from the first bottom surface toward the first top surface. A first peripheral surface having a first peripheral surface that is inclined outward to form a cutting edge with the first top surface, and the first peripheral surface is in contact with the first side surface of the chip holding member. It has a contact surface portion and a recessed portion at a position facing the second side surface of the chip holding member so as not to come into contact with the second side surface.
A second bottom surface in which the second cutting tip engages with the seating surface, a second top surface parallel to the second bottom surface, and the second cutting tip from the second bottom surface toward the second top surface. It has a second peripheral surface that slopes outward and extends to form a cutting edge with the second top surface, and the second peripheral surface is substantially the same as the first contact surface portion of the first cutting tip. It has a second contact surface portion that is inclined at an angle and abuts on the second side surface of the chip holding member.
Provided is a set of cutting tips in which the second cutting tip is thinner than the first cutting tip and the second top surface is smaller than the first top surface.

Hereinafter, embodiments of the chamfering machine according to the present invention will be described with reference to the accompanying drawings.

It is a side partial cross-sectional view of the chamfering machine which concerns on one Embodiment of this invention. It is a front partial cross-sectional view of the chamfering machine of FIG. It is a perspective view of the chip holding member included in the chamfering machine of FIG. It is a figure which shows the state which attached the thick cutting tip to the tip holding member of FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows the state which attached the thin cutting tip to the tip holding member of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. It is a schematic diagram which shows the cutting edge contact angle of a thick cutting tip and a thin cutting tip. It is a schematic diagram which shows the cutting edge contact angle of the thick cutting tip which concerns on another embodiment.

As shown in FIGS. 1 and 2, the chamfering machine 1 according to the embodiment of the present invention is built in the tool body 10, the L-shaped guide 12 attached to the tool body 10, and the tool body 10. A chip holding member 16 that is drive-connected to the rotation drive unit 14 and is rotatable about the rotation center axis R is provided. The rotary drive unit 14 includes an electric motor (not shown) built in the tool body 10, a first bevel gear 20 attached to the output shaft 18 of the electric motor, and a first bevel gear 20 fixed to a tip holding member 16. It has a second bevel gear 22 that meshes with. Cutting tips 30 and 32 having different thicknesses can be selectively fixed to the tip holding member 16 as will be described later. The cutting tips 30 and 32 are held by the tip holding member 16 so that a part thereof projects inward of the guide 12. As shown in FIG. 2, the tip holding member 16 is rotationally driven in a state where the guide 12 is pressed against the work material W, and the tool body 10 is guided in parallel with the corner portion E of the work material W to rotate. The corners E are chamfered by the cutting tips 30 and 32.

As shown in FIG. 1, the guide 12 is attached to the tool body 10 via an eccentric ring 24 for adjusting the position. The eccentric ring 24 is rotatably attached to the tool body 10 about the rotation center axis R. The outer peripheral surface 24a of the eccentric ring 24 is eccentric with respect to the rotation center axis R, and the guide 12 is rotatably attached to the eccentric outer peripheral surface 24a. Therefore, by rotating the guide 12 with respect to the eccentric ring 24, the guide 12 can be eccentric with respect to the rotation center axis R and the position of the guide 12 with respect to the rotation center axis R can be adjusted. Thereby, the amount of the cutting tips 30 and 32 protruding inward of the guide 12 can be adjusted to adjust the chamfering amount. Further, by rotating the eccentric ring 24 together with the guide 12, it is possible to change only the direction of the guide 12 with respect to the tool body 10 without changing the position of the guide 12 with respect to the rotation center axis R. That is, the amount of chamfering by the cutting tips 30 and 32 and the orientation of the tool body 10 with respect to the work material W can be adjusted by the guide 12 and the eccentric ring 24.

As shown in FIGS. 2 and 3, the tip holding member 16 is located on the opposite side of the base 26 in the direction of the rotation center axis R from the shaft-shaped base 26 fixed to the second bevel gear 22 of the rotation drive unit 14. It is provided with a tip portion 28. The thick cutting tip (first cutting tip) 30 shown in FIGS. 4 and 5 and the thin cutting tip (second cutting tip) 32 shown in FIGS. 6 and 7 can be selectively fixed to the tip portion 28. The chip fixing recess 34 is provided. The chip fixing recess 34 is formed so as to face the rotation direction of the chip holding member 16, and has a shape that opens outward in the radial direction and on the tip side. The tip fixing recess 34 has a seating surface 36 that engages with the bottom surface (first bottom surface) 30a of the thick cutting tip 30 and the bottom surface (second bottom surface) 32a of the thin cutting tip 32, and the peripheral surface (first surface) of the thick cutting tip 30. It has a first side surface 38 that engages with the peripheral surface) 30b and a second side surface 40 that engages with the peripheral surface (second peripheral surface) 32b of the thin cutting tip 32. The second side surface 40 is formed at a position protruding inward of the chip fixing recess 34 with respect to the first side surface 38. The tip holding member 16 is provided with two tip fixing recesses 34 so that two cutting tips 30 and 32 can be attached.

The thick cutting tip 30 has a regular pentagonal thin plate shape as a whole. More specifically, as shown in FIGS. 4 and 5, a regular pentagonal bottom surface 30a, a regular pentagonal top surface (first top surface) 30c parallel to the bottom surface 30a and larger than the bottom surface 30a, and a bottom surface. It has a peripheral surface 30b extending outwardly from each side of the 30a toward each side of the top surface 30c, and a cutting edge 30d is formed on each of the five sides between the peripheral surface 30b and the top surface 30c. ing. Further, an insertion hole 30e is formed which penetrates from the top surface 30c to the bottom surface 30a. The insertion hole 30e is formed so that its central axis C1 passes through the center of the top surface 30c and the bottom surface 30a. A screw hole 41 is formed in the seating surface 36 of the tip holding member 16, and the thick cutting tip 30 is formed by screwing the fixing countersunk screw (fixing screw) 42 into the screw hole 41 through the insertion hole 30e. It is fixed to the chip fixing recess 34 of the chip holding member 16. When the thick cutting tip 30 is fixed to the tip fixing recess 34, a part of the cutting edge 30d formed on the peripheral edge of the top surface 30c is radially outside the tip 28 and outside the tip 28 toward the tip side. It will be in a protruding position. A part of the cutting edge 30d passes through the inside of the guide 12 when the tip holding member 16 rotates, and cuts the corner portion E of the work material W.

As shown in FIG. 5, the peripheral surface 30b of the thick cutting tip 30 has a contact surface portion (first contact surface portion) 30f that abuts on the first side surface 38 of the chip fixing recess 34 and the inside of the contact surface portion 30f. It has a recessed portion of 30 g. The recess 30g is located at a position facing the second side surface 40 of the chip fixing recess 34, and has a shape adjacent to the second side surface 40 but not in contact with the second side surface 40. Therefore, the peripheral surface 30b of the thick cutting tip 30 contacts only the first side surface 38 of the chip fixing recess 34 at the contact surface portion 30f, and does not contact the second side surface 40. The peripheral surface 30b of the thick cutting tip 30 has a regular pentagonal cross section and has five flat surface portions 30h. The first side surface 38 of the chip fixing recess 34 is composed of two surfaces, and these two surfaces engage with two adjacent flat surface portions 30h of the peripheral surface 30b of the thick cutting tip 30. When the thick cutting tip 30 is fixed by the fixing countersunk screw 42, the side of the first side surface 38 by the fixing countersunk screw 42 so that the peripheral surface 30b contacts the first side surface 38 of the tip fixing recess 34. Is pressed against. Therefore, the fixed thick cutting tip 30 is in a state where the contact surface portion 30f of the peripheral surface 30b is pressed against the first side surface 38, and the first side surface 38 positions the cutting tip 30 in a direction parallel to the seating surface 36.

Similarly, the thin cutting tip 32 shown in FIGS. 6 and 7 also has a regular pentagonal thin plate shape as a whole. More specifically, each of the regular pentagonal bottom surface 32a, the regular pentagonal top surface (second top surface) 32c parallel to the bottom surface 32a and larger than the bottom surface 32a, and each side of the bottom surface 32a to the top surface 32c. It has a peripheral surface 32b extending outwardly inclined toward the side, and a cutting edge 32d is formed on each of the five sides between the peripheral surface 32b and the top surface 32c. Further, an insertion hole 32e is formed which penetrates from the top surface 32c to the bottom surface 32a. The insertion hole 32e is formed so that its central axis C2 passes through the center of the top surface 32c and the bottom surface 32a. The thin cutting tip 32 is also fixed to the tip fixing recess 34 of the tip holding member 16 by the fixing countersunk screw 42. Since the thin cutting tip 32 is thinner than the thick cutting tip 30, the top surface 32c of the thin cutting tip 32 is smaller than the top surface 30c of the thick cutting tip 30.

As shown in FIG. 7, the peripheral surface 32b of the thin cutting tip 32 forms a contact surface portion (second contact surface portion) 32f that extends straight from the bottom surface 32a to the top surface 32c. The contact surface portion 32f of the thin cutting tip 32 is inclined at substantially the same angle as the contact surface portion 32f of the thick cutting tip 30. Since the second side surface 40 of the tip fixing recess 34 projects with respect to the first side surface 38, the peripheral surface 32b of the thin cutting tip 32 contacts only the second side surface 40 of the tip fixing recess 34 at the contact surface portion 32f. , Does not contact the first side surface 38. The peripheral surface 32b of the thin cutting tip 32 has a regular pentagonal cross section and has five flat surface portions 32h. The second side surface 40 of the chip fixing recess 34 is composed of two surfaces, and these two surfaces engage with two adjacent flat surface portions 32h of the peripheral surface 32b of the thin cutting tip 32. When the thin cutting tip 32 is fixed by the fixing countersunk screw 42, the side of the second side surface 40 by the fixing countersunk screw 42 so that the peripheral surface 32b of the thin cutting tip 32 comes into contact with the second side surface 40 of the tip fixing recess 34. Is pressed against. Therefore, the peripheral surface 32b of the fixed thin cutting tip 32 is pressed against the second side surface 40, and the second side surface 40 positions the fixed thin cutting tip 32 in a direction parallel to the seating surface 36.

Comparing the positions of the central axis C1 of the insertion hole 30e of the thick cutting tip 30 fixed in the chip fixing recess 34 and the central axis C2 of the insertion hole 32e of the thin cutting tip 32, the central axis C2 of the thin cutting tip 32 is located. Is more deviated from the central axis C3 of the fixing countersunk screw 42 to the side of the cutting edge 32d. That is, the thin cutting tip 32 is fixed to the thick cutting tip 30 as a whole by shifting to the side of the cutting edge 32d protruding to the outside of the tip 28.

As shown in FIG. 8, comparing the positions of the cutting edge 30d of the thick cutting tip 30 and the cutting edge 32d of the thin tip when fixed to the chip holding member 16, the cutting tip 32d of the thin cutting tip 32 is thicker. It will be located behind the cutting edge 30d of 30 in the direction of rotation. Since the positions of the cutting edges 30d and 32d in the rotation direction are different, the angles of the cutting edges 30d and 32d when rotating and the cutting edges 30d and 32d hit the work material W at the deepest position, that is, the cutting edge contact angles are different. Become. Specifically, the thick cutting tip 30 having the cutting edge 30d in the front in the rotation direction is at the position where the cutting edge 30d hits the work material W most deeply with a smaller amount of rotation, and is thin having the cutting edge 32d in the rear in the rotation direction. The cutting tip 32 is at a position where the cutting edge 32d hits the work material W most deeply with a larger amount of rotation. Therefore, the cutting edge contact angle α of the thick cutting tip 30 is smaller than the cutting edge contact angle β of the thin cutting tip 32. That is, the cutting edge contact angle can be changed by using cutting tips having different thicknesses. However, if the position of the cutting edge is set to the rear in the rotation direction by reducing the thickness, at the same time, the distance from the rotation center axis R to the cutting edge is shortened, and the depth at which the cutting edge hits the work material W also changes. Then, the chamfering amount adjusted by the eccentric ring 24 changes due to the replacement of the cutting tip. In the chamfering machine 1, the thin cutting tip 32 is positioned by the second side surface 40 at a position protruding toward the cutting edge 32d from the first side surface 38 as described above. Therefore, the thin cutting tip 32 has its central axis C2 protruding outward of the tip 28 with respect to the central axis C1 of the thick cutting tip 30 by the amount that the second side surface 40 protrudes with respect to the first side surface 38. It is fixed at a position shifted to the side of the cutting edge 32d. That is, the cutting edge 32d of the thin cutting tip 32 is located at a position shifted to the corner E side of the work material W by the amount that the second side surface 40 protrudes toward the cutting edge 32d with respect to the first side surface 38. Become. As a result, in the chamfering machine 1, when the tip holding member 16 is rotated, the circular locus T1 drawn by the cutting edge 30d of the thick cutting tip 30 and the circular locus T2 drawn by the thin cutting tip 32 substantially coincide with each other. It is designed to do. In other words, the first side surface 38 and the second side surface 40 are shaped so that the circular locus T1 drawn by the cutting edge 30d of the thick cutting tip 30 and the circular locus T2 drawn by the cutting edge 32d of the thin cutting tip 32 substantially coincide with each other. It is attached.

In this way, in the chamfering machine 1, the cutting edge contact angle can be changed simply by exchanging the cutting tips 30 and 32. Furthermore, even if the thick cutting tip 30 and the thin cutting tip 32 are replaced, the trajectories T1 and T2 drawn by the cutting edges 30d and 32d are substantially the same, so that the cutting tips 30 and 32 are replaced. Sometimes it is not necessary to readjust the chamfer amount by the eccentric ring 24.

In the thick cutting tip 130 according to another embodiment, as shown in FIG. 9, an inclined surface 130i inclined from the cutting edge 130d toward the center of the top surface 130c on the opposite side of the bottom surface 130a is formed. By providing such an inclined surface 130i, the cutting edge contact angle γ can be made smaller than the cutting edge contact angle α of the thick cutting tip 30 and the cutting edge contact angle β of the thin cutting tip 32 described above.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, the shape of the cutting tip is not limited to a regular pentagon, and may be another regular polygonal shape such as an equilateral triangle or a square. By making the cutting tip a regular polygonal shape, a plurality of cutting edges are formed, and even if one cutting edge is worn, the other cutting edge can be used by rotating the cutting tip and reattaching it, so that one cutting can be performed. Many chamfering processes can be performed with the insert. Alternatively, the shape of the cutting tip may be another shape such as a parallelogram, which is not a regular polygon. Further, in the above embodiment, the cutting edge of the cutting tip is linearly formed so as to C chamfer the corner portion of the work material at 45 °, but linear chamfering is performed at an angle other than 45 °. The angle of the cutting edge may be changed, the fixing angle of the cutting tip may be changed, or the cutting edge may be curved so as to perform a round R chamfer. In the above embodiment, two types of cutting chips having different thicknesses can be used, but more cutting chips having different thicknesses are used by making the side surface of the chip fixing recess three or more steps. You can also make it possible. Further, the seating surface of the tip fixing recess may be made inclined with respect to the rotation center axis so that the cutting tip can be mounted obliquely with respect to the rotation center axis. In the above embodiment, the tool body is guided in parallel with the linearly extending corners of the work material by the L-shaped guide, but a guide of another form such as a guide roller is used. Then, the tool body is guided along the curved and extending corners such as the corner of the curved groove and the corner of the inner circumference of the hole, and the curved corner is chamfered. It may be a machine.

1 Chamfering machine 10 Tool body 12 Guide 14 Rotational drive 16 Chip holding member 18 Output shaft 20 1st bevel gear 22 2nd bevel gear 24 Eccentric ring 24a Outer peripheral surface 26 Base 28 Tip 30 Cutting tip (1st cutting tip)
30a bottom surface (first bottom surface)
30b peripheral surface (first peripheral surface)
30c top surface (first top surface)
30d Cutting edge 30e Insertion hole 30f Contact surface part (first contact surface part)
30g Recess 30h Flat surface 32 Cutting insert (2nd cutting insert)
32a bottom surface (second bottom surface)
32b peripheral surface (second peripheral surface)
32c top surface (second top surface)
32d Cutting edge 32e Insertion hole 32f Contact surface part (second contact surface part)
32h Flat surface 34 Tip fixing recess 36 Seating surface 38 First side surface 40 Second side surface 41 Screw hole 42 Fixing countersunk screw (fixing screw)
130 Cutting Tip 130a Bottom 130c Top Surface 130d Cutting Edge 130i Inclined Surface C1, C2, C3 Center Axis R Rotation Center Axis T1, T2 Trajectory W Work Material E Corner α, β, γ Cutting Edge Contact Angle

Claims (8)

In a chamfering machine in which the tool body is guided along the corners of the work material while rotating the cutting tip to chamfer the corners with the cutting tip, the cutting tip is held and the tool is held. It is a chip holding member that is driven and connected to the rotation drive unit of the main body and is rotationally driven around the rotation center axis.
A base portion that is driven and connected to the rotation drive portion of the chamfering machine and a tip portion that is opposite to the base portion in the direction of the rotation center axis are provided.
A first cutting tip having a cutting edge on the peripheral edge of the top surface and a second cutting tip having a cutting edge on the peripheral edge of the top surface and thinner than the first cutting tip, at least a part of the cutting edge. It has a tip fixing recess that selectively fixes it so that it protrudes to the outside of the tip and can engage with the corners of the work material.
The tip fixing recess is a seating surface that faces the rotational direction of the tip holding member and engages with the bottom surfaces of the first and second cutting tips, and the seating surface that engages with the peripheral surface of the first cutting tip. Positioning of the second cutting tip in a direction parallel to the seating surface by engaging with the peripheral surface of the second cutting tip and the first side surface for positioning the first cutting tip in a direction parallel to the surface. The cutting edge of the second cutting tip when fixed to the tip fixing recess is located behind the cutting edge of the first cutting tip in the rotational direction. Being done
A chip holding member having a second side surface projecting from the first side surface on a side where at least a part of the cutting edge projects outward from the tip portion. When the tip holding member is rotated, it is fixed to the tip fixing recess and the circular locus drawn by the portion of the cutting edge protruding outward from the tip of the first cutting tip fixed to the tip fixing recess. The first and second side surfaces are shaped so as to substantially match the circular locus drawn by the portion of the cutting edge protruding outward from the tip of the second cutting tip, according to claim 1. Tip holding member. Each of the first and second cutting tips has an insertion hole penetrating from the top surface to the bottom surface.
The seating surface has a screw hole into which a fixing screw passed through the insertion hole of the first and second cutting tips is screwed, and the fixing screw is screwed into the screw hole through the insertion hole. The first or second cutting tip is fixed to the tip fixing recess in a state of being pressed against the first and second side surfaces by the fixing screw, respectively, according to claim 1 or 2. The tip holding member according to. The top surface and the bottom surface of the first and second cutting tips have a regular polygonal shape, and the center axis of the insertion hole passes through the center of the top surface and the bottom surface of the first and second cutting tips. The insertion hole is formed,
The central axis of the insertion hole of the second cutting tip when fixed in the tip fixing recess is more than the central axis of the insertion hole of the first cutting tip when fixed in the tip fixing recess. The third aspect of the present invention, wherein the first and second side surfaces are shaped so as to be at a position significantly deviated from the central axis of the fixing screw on the side of the cutting edge portion protruding outward from the tip portion. Tip holding member. The peripheral surfaces of the first and second cutting tips have a regular polygonal cross section and have a plurality of flat surfaces.
Any of claims 1 to 4, wherein the first and second side surfaces of the tip fixing recess are adapted to engage at least two planar portions of the peripheral surface of the first and second cutting tips. The tip holding member according to item 1. A chamfering machine including the chip holding member according to any one of claims 1 to 5. A cutting tip fixed to the tip holding member according to any one of claims 1 to 5, wherein the cutting tip engages with the seating surface, a top surface parallel to the bottom surface, and the bottom surface to the top surface. It has a peripheral surface that extends inclinely toward the outside of the cutting tip and forms a cutting edge with the top surface, and the peripheral surface abuts on the first side surface of the chip holding member. A cutting tip having a surface portion and a recessed recess so as not to come into contact with the second side surface at a position facing the second side surface of the tip holding member. A set of cutting tips including the first and second cutting tips fixed to the tip holding member according to any one of claims 1 to 5.
A first bottom surface in which the first cutting tip engages with the seating surface, a first top surface parallel to the first bottom surface, and the first cutting tip from the first bottom surface toward the first top surface. A first peripheral surface having a first peripheral surface that is inclined outward to form a cutting edge with the first top surface, and the first peripheral surface is in contact with the first side surface of the chip holding member. It has a contact surface portion and a recessed portion at a position facing the second side surface of the chip holding member so as not to come into contact with the second side surface.
A second bottom surface in which the second cutting tip engages with the seating surface, a second top surface parallel to the second bottom surface, and the second cutting tip from the second bottom surface toward the second top surface. It has a second peripheral surface that slopes outward and extends to form a cutting edge with the second top surface, and the second peripheral surface is substantially the same as the first contact surface portion of the first cutting tip. It has a second contact surface portion that is inclined at an angle and abuts on the second side surface of the chip holding member.
A set of cutting tips in which the second cutting tip is thinner than the first cutting tip and the second top surface is smaller than the first top surface.

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