WO2021132357A1

WO2021132357A1 - Holder, cutting tool, and method for manufacturing cut workpiece

Info

Publication number: WO2021132357A1
Application number: PCT/JP2020/048217
Authority: WO
Inventors: 佑知権隨
Original assignee: 京セラ株式会社
Priority date: 2019-12-26
Filing date: 2020-12-23
Publication date: 2021-07-01
Also published as: JPWO2021132357A1; JP7330296B2

Abstract

A holder based on one non-restricted aspect of the present disclosure has: a body part in a rod shape that extends from a first end to a second end along a center axis, the body part having a hollow cavity extending along the center axis; and a weight positioned inside the hollow cavity. The weight has a round-column-shaped first portion, and a flat-plate-form second portion positioned closer to the first end than is the first portion.

Description

Manufacturing method for holders, cutting tools and cutting products

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2019-235934 filed on December 26, 2019, and the entire disclosure of future applications is incorporated herein by reference.

This disclosure relates to a holder used in cutting. Specifically, the present invention relates to a holder provided with an anti-vibration mechanism.

Conventionally, various holders equipped with an anti-vibration mechanism have been proposed. In the cutting tool described in JP-A-2006-102837 (Patent Document 1), a pocket is formed in the main body portion. A damping piece is inserted into this pocket with a rotation fulcrum in the center of the main body. In each of the clockwise and counterclockwise rotations, the vibration damping piece vibrates to attenuate the torsional vibration of the main body.

The one-sided holder according to the present disclosure is a rod shape extending from the first end to the second end along the central axis, and has a main body having a cavity extending along the central axis and a main body portion of the cavity. It has a weight located inside. The weight has a cylindrical first portion and a flat plate-shaped second portion located closer to the first end than the first portion.

It is a perspective view which shows the holder (cutting tool) of embodiment which is not limited in this disclosure. It is a side view of the holder shown in FIG. It is a side view of the holder shown in FIG. It is sectional drawing of the IV cross section in the holder shown in FIG. It is an enlarged view of the 1st end side of the holder shown in FIG. It is a perspective view of the weight in the holder shown in FIG. It is a perspective view of the state in which the 4th part and the 5th part are omitted from the weight shown in FIG. It is a plan view of the weight which is seen when the holder shown in FIG. 1 is seen through the plane toward the first end, and is the figure in the state which omitted the 4th part. It is a side view which looked at the state which did not omit the 4th part of the weight shown in FIG. 8 from the A1 direction. It is a side view which looked at the state which did not omit the 4th part of the weight shown in FIG. 8 from the A2 direction. It is an enlarged view which expanded the region B1 shown in FIG. It is a perspective view which shows the weight in the holder of the embodiment which is not limited in this disclosure. It is a perspective view of the state in which the 4th part and the 5th part are omitted from the weight shown in FIG. It is a plan view which looked at the weight shown in FIG. 13 from the side of the 2nd part, and is the figure which corresponds to FIG. It is a side view which looked at the weight shown in FIG. 14 from the A3 direction. It is a side view which looked at the weight shown in FIG. 14 from the A4 direction. It is the schematic which shows one step in the manufacturing method of the cutting work of embodiment which is not limited in this disclosure. It is the schematic which shows one step in the manufacturing method of the cutting work of embodiment which is not limited in this disclosure. It is the schematic which shows one step in the manufacturing method of the cutting work of embodiment which is not limited in this disclosure.

<Holder>
Hereinafter, the holders of a plurality of embodiments, which are not limited to the present disclosure, will be described in detail with reference to the drawings. However, in each of the figures referred to below, for convenience of explanation, only the main members necessary for explaining the embodiment are shown in a simplified manner. Therefore, the holder may include any component not shown in each referenced figure. In addition, the dimensions of the members in each drawing do not faithfully represent the dimensions and dimensional ratios of the actual constituent members. These points are the same in the method for manufacturing cutting tools and cutting products, which will be described later.

As in the non-limiting example shown in FIGS. 1 to 5, the holder 1 may have a rod-shaped main body portion 3 extending from the first end 3a to the second end 3b along the central axis O1. Generally, the first end 3a is called the "tip" and the second end 3b is called the "rear end". The main body 3 may have, for example, a cylindrical shape or a polygonal prism shape. The main body 3 in the non-limiting example shown in FIGS. 1 to 5 has a cylindrical shape. Examples of the material of the main body 3 include steel, cast iron, aluminum alloy, and the like.

The size of the main body 3 may be appropriately set according to the size of the work material. For example, the length of the main body 3 in the direction along the central axis O1 may be set to about 60 mm or more and 3500 mm or less. Further, the width (diameter) of the main body 3 in the direction orthogonal to the central axis O1 may be set to about 6 mm or more and 250 mm or less.

The main body 3 may be located on the side of the first end 3a and may have a pocket 5 to which a cutting insert can be attached. The pocket 5 may be a recessed portion on the side of the first end 3a of the main body portion 3 before the cutting insert is attached.

The number of pockets 5 may be one or a plurality. When the number of pockets 5 is plural, the number may be 2 to 10. In one non-limiting example shown in FIG. 1, the main body 3 has one pocket 5.

The main body 3 may have a cavity 7 extending along the central axis O1. The cavity 7 can be used to accommodate the weight described below. The cavity 7 may have a cylindrical shape, for example. Further, the cavity 7 may be located closer to the second end 3b than the pocket 5. In this case, the rigidity of the portion of the main body 3 where the pocket 5 is located is likely to be ensured.

As in the non-limiting example shown in FIGS. 4 to 11, the holder 1 may have a weight 9 located inside the cavity 7. The weight 9 can function as a vibration isolator. Examples of the material of the weight 9 include, but are not limited to, a tungsten alloy. The specific gravity of the material of the weight 9 may be larger than the specific gravity of the material of the main body 3.

Here, the weight 9 may have a cylindrical first portion 11 and a flat plate-shaped second portion 13 located closer to the first end 3a than the first portion 11. The first portion 11 can come into contact with the inner wall surface 15 of the cavity 7. Further, the second portion 13 can function as a leaf spring.

When the weight 9 has the first portion 11 having a cylindrical shape, it is easy to make the weight 9 heavier while keeping the inner diameter of the cavity 7 small. Further, when the weight 9 has a flat plate-shaped second portion 13, the weight 9 is likely to be elastically deformed at the second portion 13. Therefore, when the weight 9 has the first portion 11 and the second portion 13, the vibration isolation performance is high, and chatter vibration is less likely to occur during cutting.

The length L1 in the direction along the central axis O1 in the first part 11 may be the same as or different from the length L2 in the direction along the central axis O1 in the second part 13. When the length L1 is longer than the length L2 as in the non-limiting example shown in FIG. 10, the weight 9 is likely to be heavier, so that the vibration isolation performance is higher and chatter vibration is more generated during cutting. Hateful.

The end portion 13a on the side of the first end 3a in the second portion 13 may be fixed to the main body portion 3. In other words, in the second portion 13, the end portion 13a on the side of the first end 3a may be a fixed end. In this case, the function of the second portion 13 as a leaf spring is high. Therefore, the vibration isolation performance is high.

The end portion 13a at the second portion 13 may be fixed by, for example, an adhesive or by welding. Further, the end portion 13a may be fixed to the main body portion 3 by providing a convex portion or a concave portion on the end portion 13a and providing a concave portion or a convex portion on the main body portion 3 and fitting them in an uneven manner. The fixing of the end portion 13a is not limited to the above-exemplified fixing. The illustrated fixation can also be applied to fixation at other sites.

The central axis O1 may or may not pass through the first part 11. As in the unrestricted example shown in FIG. 9, when the central axis O1 passes through the first portion 11, the change in the position of the first portion 11 due to the elastic deformation of the second portion 13 is around the central axis O1. It is easy to occur. Therefore, the first portion 11 can easily move in the limited space of the cavity 7. Therefore, the anti-vibration performance is high.

The central axis O1 may or may not pass through the second part 13. As in the non-limiting example shown in FIG. 9, when the central axis O1 passes through the second portion 13, the second portion 13 is likely to be elastically deformed around the central axis O1. Therefore, the second portion 13 can easily move in the limited space of the cavity 7. Therefore, the anti-vibration performance is high.

As in the non-limiting example shown in FIG. 8, the second portion 13 may be located inside the outer edge 11a of the first portion 11 when viewed in a plane toward the first end 3a. In this case, it is easy to avoid the second portion 13 coming into contact with the inner wall surface 15 of the cavity 7. Therefore, the second portion 13 is less likely to be damaged.

The first part 11 and the second part 13 may be connected to each other, or another part may be located between them. As in the non-limiting example shown in FIG. 6, the weight 9 is located between the first part 11 and the second part 13, and connects the first connecting part 17 connected to the first part 11 and the second part 13. You may also have more. As in the non-limiting example shown in FIG. 11, the width W of the first connecting portion 17 in the direction orthogonal to the central axis O1 may increase as it approaches the first portion 11. In these cases, the connection strength between the first site 11 and the second site 13 is high, and the second site 13 is unlikely to fall off from the first site 11. Therefore, anti-vibration performance can be exhibited for a long period of time.

As in the non-limiting example shown in FIG. 6, the width W of the first connecting portion 17 in the direction orthogonal to the central axis O1 and parallel to the main surface of the second portion 13 having a flat plate shape is the first portion. It may increase as it approaches 11. Further, the width of the first connecting portion 17 in the direction orthogonal to the central axis O1 and orthogonal to the main surface of the flat plate-shaped second portion 13 may increase as it approaches the first portion 11.

The flat plate-shaped second portion 13 is easily elastically deformed in the direction orthogonal to its main surface. Therefore, if the width of the first connecting portion 17 in the direction orthogonal to the central axis O1 and orthogonal to the main surface of the flat plate-shaped second portion 13 becomes larger as it approaches the first portion 11, for a long period of time. It can exhibit higher anti-vibration performance.

The weight 9 may further have a flat plate-shaped third portion 19 located closer to the second end 3b than the first portion 11. The third portion 19 can function as a leaf spring in the same manner as the second portion 13. Therefore, when the weight 9 has the third portion 19, the anti-vibration performance is high. The shape of the third portion 19 may be the same as or different from the shape of the second portion 13.

In the third portion 19, the end portion 19a on the side of the second end 3b may be fixed to the main body portion 3. In other words, in the third portion 19, the end portion 19a on the side of the second end 3b may be a fixed end. In this case, the function of the third portion 19 as a leaf spring is high. Therefore, the vibration isolation performance is high.

The central axis O1 may or may not pass through the third part 19. As in the non-limiting example shown in FIG. 9, when the central axis O1 passes through the third portion 19, the second portion 13 is likely to be elastically deformed around the central axis O1. Therefore, the third portion 19 can easily move in the limited space of the cavity 7. Therefore, the anti-vibration performance is high.

The third portion 19 may be located inside the outer edge 11a of the first portion 11 when viewed in a plane toward the first end 3a. In this case, it is easy to avoid the third portion 19 coming into contact with the inner wall surface 15 of the cavity 7. Therefore, the third portion 19 is less likely to be damaged.

The first part 11 and the third part 19 may be connected to each other, or another part may be located between them. As in the non-limiting example shown in FIG. 9, the weight 9 is located between the first part 11 and the third part 19, and connects the second connecting part 21 connected to the first part 11 and the third part 19. You may also have more. The width of the second connecting portion 21 in the direction orthogonal to the central axis O1 may increase as it approaches the first portion 11. In these cases, the connection strength between the first site 11 and the third site 19 is high, and the third site 19 is unlikely to fall off from the first site 11. Therefore, anti-vibration performance can be exhibited for a long period of time.

The width of the second connecting portion 21 in the direction orthogonal to the central axis O1 and parallel to the main surface of the flat plate-shaped third portion 19 may increase as it approaches the first portion 11. Further, the width of the second connecting portion 21 in the direction orthogonal to the central axis O1 and orthogonal to the main surface of the flat plate-shaped third portion 19 may increase as it approaches the first portion 11.

The flat plate-shaped third portion 19 is easily elastically deformed in the direction orthogonal to its main surface. Therefore, if the width of the second connecting portion 21 in the direction orthogonal to the central axis O1 and orthogonal to the main surface of the flat plate-shaped third portion 19 becomes larger as it approaches the first portion 11, for a long period of time. It can exhibit higher anti-vibration performance.

As in the non-limiting example shown in FIG. 8, the thickness direction C1 of the second portion 13 may be the same as the thickness direction C2 of the third portion 19 when the plane is viewed through toward the first end 3a (see FIG. 10). ). In this case, since the second portion 13 and the third portion 19 bend in the same direction, the second portion 13 and the third portion 19 are likely to vibrate. It should be noted that the same thickness direction may be substantially the same, and does not have to be the same in a strict sense. Specifically, when the angle formed by the direction orthogonal to the main surface of the second portion 13 and the direction orthogonal to the main surface of the third portion 19 is within 10 °, the thickness direction is substantially the same. It may be evaluated as having.

The weight 9 may further have a plate-shaped fourth portion 23 located closer to the first end 3a than the second portion 13. As in the non-limiting example shown in FIG. 9, the fourth portion 23 may be positioned so that the radial direction C3 is orthogonal to the central axis O1. In these cases, when the weight 9 moves to the side of the first end 3a and comes into contact with the main body 3, the surface 23a on the side of the first end 3a of the fourth part 23 is likely to come into contact with the main body 3. Therefore, the impact is easily alleviated and the weight 9 is less likely to be damaged.

When the weight 9 has the fourth part 23, the end portion 13a on the side of the first end 3a of the second part 13 may be fixed to the fourth part 23. In this case, since the end portion 13a becomes a fixed end, the function of the second portion 13 as a leaf spring is high. Therefore, the vibration isolation performance is high.

The weight 9 may further have a plate-shaped fifth portion 25 located closer to the second end 3b than the third portion 19. As in the non-limiting example shown in FIG. 9, the fifth portion 25 may be positioned so that the radial direction C4 is orthogonal to the central axis O1. In these cases, when the weight 9 moves to the side of the second end 3b and comes into contact with the main body 3, the surface 25a on the side of the second end 3b in the fifth part 25 is likely to come into contact with the main body 3. Therefore, the impact is easily alleviated and the weight 9 is less likely to be damaged.

When the weight 9 has the fifth part 25, the third part 19 may have the end 19a on the side of the second end 3b fixed to the fifth part 25. In this case, since the end portion 19a becomes a fixed end, the function of the third portion 19 as a leaf spring is high. Therefore, the vibration isolation performance is high.

As in the non-limiting example shown in FIGS. 4 and 5, the main body portion 3 is located on the rod-shaped first member 27 extending along the central axis O1 and on the side of the first end 3a with respect to the first member 27. However, a second member 29 that comes into contact with the first member 27 may be further provided. As in the non-limiting example shown in FIG. 5, the first member 27 may have a recess 31 that opens toward the first end 3a. The cavity 7 may be formed by the recess 31 and the second member 29.

The first member 27 is also called a shank and is a member that can be gripped by a machine tool. The second member 29, also called a head, is a member capable of fixing the cutting insert. In the non-limiting example shown in FIG. 1, the pocket 5 described above is located in the second member 29.

As shown in FIG. 5, when the first member 27 has the recess 31, the weight 9 can be attached to and detached from the holder 1 through the opening 33 of the recess 31. Further, when the cavity 7 is formed by the recess 31 and the second member 29, the cavity 7 is located inside the first member 27, so that the rigidity of the second member 29, which is likely to receive a large impact during cutting, is increased. Easy to secure. The first member 27 and the second member 29 may be detachably configured.

As in the unrestricted example shown in FIG. 4, the center (center) 7a of the cavity 7 in the direction along the central axis O1 is the third more than the center (center) 27a of the first member 27 in the direction along the central axis O1. It may be located on the side of one end 3a. In this case, since the cavity 7 constituting the vibration isolation mechanism is located near the first end 3a where a large impact is likely to be applied during cutting, chatter vibration is unlikely to occur during cutting. Further, it is easy to secure the rigidity of the portion of the first member 27 located on the side of the second end 3b with respect to the center 27a. Therefore, this portion may be gripped by a machine tool. As in the case of the non-limiting example shown in FIG. 4, the entire cavity 7 may be located closer to the first end 3a than the center 27a.

The holder 1 may further have a lid that closes the opening 33 of the recess 31. In this case, it is easy to prevent the weight 9 from unintentionally coming out of the cavity 7. In one non-limiting example shown in FIG. 5, the second member 29 can function as a lid.

The lid may be rotatable along the circumferential direction of the central axis O1. Further, in the second portion 13, the end portion 13a on the side of the first end 3a may be fixed to the lid. In these cases, the orientation of the second portion 13 in the thickness direction C1 can be changed by rotating the lid. When the weight 9 has the third portion 19, the orientation of the third portion 19 in the thickness direction C2 can be changed. Therefore, the vibration isolation performance can be adjusted according to the cutting conditions. When the weight 9 has the fourth portion 23, the end portion 13a on the side of the first end 3a in the second portion 13 may be fixed to the fourth portion 23, and the fourth portion 23 in the fourth portion 23 may be fixed. The surface 23a on the side of one end 3a may be fixed to the lid. In this case as well, the anti-vibration performance can be adjusted in the same manner as described above.

Next, one holder 1a of the non-limiting embodiment of the present disclosure will be described with reference to FIGS. 12 to 16. In the following, the differences between the holder 1a and the holder 1 will be mainly described, and detailed description of the points having the same configuration as the holder 1 may be omitted.

In the holder 1a, the second portion 13 may intersect with the third portion 19 when viewed in a plane toward the first end 3a, as in the non-limiting example shown in FIG. In this case, the second portion 13 and the third portion 19 can be bent in different directions.

The thickness direction C1 of the second portion 13 may be orthogonal to the thickness direction C2 of the third portion 19 when the plane is viewed through toward the first end 3a. In this case, since the second portion 13 and the third portion 19 bend in the directions orthogonal to each other, the second portion 13 and the third portion 19 are less likely to vibrate. It should be noted that the term “orthogonal” may be generally orthogonal, and does not have to be orthogonal in a strict sense. Specifically, when the angle formed by the direction orthogonal to the main surface of the second portion 13 and the direction orthogonal to the main surface of the third portion 19 is 80 ° to 100 °, the thickness direction is approximately the same. It may be evaluated as orthogonal.

<Cutting tool>
Next, the cutting tool of the embodiment not limited to the present disclosure will be described in detail with reference to FIGS. 1 to 3 by taking as an example the case where the holder 1 is provided.

The cutting tool 101 in the non-limiting example shown in FIGS. 1 to 3 may include a holder 1 and a cutting insert 103 mounted on the holder 1. When the cutting tool 101 includes the holder 1, the holder 1 has high vibration isolation performance, so that excellent cutting performance can be exhibited.

The cutting insert 103 may be simply referred to as an insert 103. The insert 103 in the non-limiting example shown in FIG. 1 may have a polygonal plate shape. The shape of the insert 103 is not limited to the polygonal plate shape.

The insert 103 in the non-limiting example shown in FIG. 2 may have a cutting edge 105. The insert 103 may be located in the pocket 5 so that the cutting edge 105 projects laterally on the side of the first end 3a of the holder 1. The cutting tool 101 can perform cutting by bringing the cutting edge 105 into contact with the work material. In the non-limiting example shown in FIG. 2, the cutting edge 105 may be located farthest from the central axis O1 on the side of the first end 3a of the main body 3. When the cutting edge 105 projects laterally in this way, it is possible to bring only the vicinity of the cutting edge 105 into contact with the work material.

The insert 103 in the non-limiting example shown in FIG. 1 may further have a through hole 107. Further, the cutting tool 101 in the non-limiting example shown in FIG. 1 may further include a fixing member 109. The fixing member 109 may be a member for fixing the insert 103 to the holder 1. The fixing member 109 in the non-limiting example shown in FIG. 1 may be a screw 109. The fixing member 109 is not limited to the screw 109, and may be, for example, a clamp member or the like.

In an example not limited to that shown in FIG. 1, the insert 103 may have a through hole 107 as described above, and the holder 1 may have a screw hole at a position corresponding to the through hole 107. The insert 103 can be fixed to the holder 1 by inserting the screw 109 into the through hole 107 of the insert 103 and fixing the screw 109 to the screw hole of the holder 1. As in the non-limiting example shown in FIG. 1, the through hole 107 and the screw hole may extend in a direction orthogonal to the central axis O1.

Examples of the material of the insert 103 include cemented carbide and cermet. Examples of the composition of the cemented carbide include WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. WC-Co can be produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC-TiC-Co may be WC-Co with titanium carbide (TiC) added. WC-TiC-TaC-Co may be WC-TiC-Co with tantalum carbide (TaC) added.

Further, the cermet may be a sintered composite material in which a metal is composited with a ceramic component. Specifically, examples of the cermet include those containing a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN) as a main component.

In the non-limiting example shown in FIGS. 1 to 3, the cutting tool 101 includes the holder 1, but the cutting tool 101 is not limited to such a form. For example, the cutting tool 101 may include the holder 1a.

<Manufacturing method of machined products>
Next, a method for producing a machined product according to an embodiment not limited to the present disclosure will be described in detail with reference to FIGS. 17 to 19. In the example shown in FIGS. 17 to 19, a cutting tool 101 including the holder 1 is used, but the present invention is not limited to such a form. For example, a cutting tool 101 including the holder 1a may be used.

The method for manufacturing the machined product 203 of the embodiment without limitation may include the following steps (1) to (4).
(1) As in the non-limiting example shown in FIG. 17, the work material 201 and the cutting tool 101 are prepared.
(2) Rotate the work material 201 to
(3) As in the non-limiting example shown in FIG. 18, the work material 201 and the cutting tool 101 are brought into contact with each other.
(4) As in the non-limiting example shown in FIG. 19, the work material 201 and the cutting tool 101 are separated from each other.

Specifically, as the material of the work material 201 prepared in the step (1), for example, carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metal and the like can be mentioned. Further, in the non-limiting example shown in FIG. 17, the above-mentioned cutting tool 101 may be prepared in the step (1).

In the step (2), the work material 201 may be rotated with reference to the rotation axis O2, as in the non-limiting example shown in FIG.

In the step (3), first, the cutting tool 101 may be moved in the direction of the arrow Y1 to bring the cutting tool 101 relatively close to the rotating work material 201. Next, as in the non-limiting example shown in FIG. 18, the cutting tool 101 may be brought into contact with the rotating work material 201. In an example not limited to that shown in FIG. 18, the work material 201 may be cut by bringing the cutting edge 105 of the cutting tool 101 into contact with the work material 201.

In the step (4), as in the non-limiting example shown in FIG. 19, by moving the cutting tool 101 in the direction of the arrow Y2, the cutting tool 101 is separated from the work material 201 to obtain the work piece 203. Good.

In the method of manufacturing the cutting work piece 203 of the embodiment, which is not limited to the present invention, when the cutting tool 101 provided with the holder 1 is used, since the vibration isolation performance of the holder 1 is high, excellent processing while suppressing the occurrence of chatter vibration is performed. The work material 201 can be cut with accuracy. As a result, it is possible to obtain a machined product 203 having a machined surface with high accuracy.

In the step (3), the work material 201 may be brought closer to the cutting tool 101. In the step (4), the work material 201 may be moved away from the cutting tool 101. When the cutting process is continued, the process of keeping the work material 201 in a rotated state and bringing the cutting edge 105 into contact with different parts of the work material 201 may be repeated.

Although the methods for manufacturing the

holders

1, 1a, the cutting tool 101, and the work piece 203 of the embodiment which are not limited thereto have been illustrated above, the present disclosure is not limited to the above embodiment and is arbitrary as long as the gist of the present disclosure is not deviated. It goes without saying that it can be made.

For example, in the above-mentioned not limited embodiment, the cutting tool 101 is a turning tool, but instead of this, the cutting tool 101 may be a turning tool or the like. When the cutting tool 101 is used as a rolling tool, the cutting tool 101 may be rotated in the step (2) in the manufacturing method of the cutting work piece 203.

1, 1a ... Holder 3 ... Main body 3a ... 1st end 3b ... 2nd end 5 ... Pocket 7 ... Cavity 7a ... Center (center)
9 ... Weight 11 ... 1st part 11a ... Outer edge 13 ... 2nd part 13a ... End 15 ... Inner wall surface 17 ... 1st connection 19 ... 3rd part 19a・・ End 21 ・・・ 2nd connection 23 ・・・ 4th part 23a ・・ Surface 25 ・・・ 5th part 25a ・・ Surface 27 ・・・ First member 27a ・・ Center (center)
29 ... Second member 31 ... Recess 33 ... Opening 101 ... Cutting tool 103 ... Cutting insert (insert)
105 ... Cutting edge 107 ... Through hole 109 ... Fixing member (screw)
201 ... Work material 203 ... Machined work O1 ... Central axis O2 ... Rotating axis

Claims

A rod-shaped body extending from the first end to the second end along the central axis and having a cavity extending along the central axis, and a main body portion.
With a weight located inside the cavity,
The weight is
The first part of the cylindrical shape and
A holder having a flat plate-shaped second portion located closer to the first end than the first portion.
The holder according to claim 1, wherein the end portion of the second portion on the side of the first end is fixed to the main body portion.
The holder according to claim 1 or 2, wherein the central axis passes through the first portion.
The holder according to any one of claims 1 to 3, wherein the central axis passes through the second portion.
The holder according to any one of claims 1 to 4, wherein the second portion is located inside the outer edge of the first portion when viewed in a plane toward the first end.
The weight further has a connecting portion located between the first portion and the second portion and connected to the first portion and the second portion.
The holder according to claim 5, wherein the width of the connecting portion in the direction orthogonal to the central axis increases as it approaches the first portion.
The holder according to any one of claims 1 to 6, wherein the weight further has a flat plate-shaped third portion located closer to the second end than the first portion.
The holder according to claim 7, wherein the third portion is an end portion on the side of the second end fixed to the main body portion.
The holder according to claim 7 or 8, wherein the central axis passes through the third portion.
The holder according to any one of claims 7 to 9, wherein the thickness direction of the second portion is the same as the thickness direction of the third portion when viewed in a plane toward the first end.
The holder according to any one of claims 7 to 9, wherein the second part intersects with the third part when viewed in a plane toward the first end.
The holder according to claim 11, wherein the thickness direction of the second portion is orthogonal to the thickness direction of the third portion when viewed in a plane toward the first end.
The holder according to any one of claims 1 to 12, and the holder.
A cutting tool comprising a cutting insert mounted on the holder.
A step of rotating at least one of the cutting tool and the work material according to claim 13.
The process of bringing the cutting tool into contact with the work material and
A method for manufacturing a work piece, comprising a step of separating the cutting tool from the work material.