Tool holder, cutting tool, and method of manufacturing a machined workpiece

Abstract

A tool shank capable of reducing vibration during cutting processing, particularly vibration in a direction orthogonal to a central axis of the tool shank. The tool shank has a main body which is a bar shape extending from a first end surface to a second end surface along a central axis (L) and has a hollow extending along the central axis (L), and a weight of a cylindrical shape inserted into the hollow, a first fixing member located at a position close to the first end surface, and a first elastic member located between the weight and the first fixing member. In a cross section along the central axis (L), the first elastic member is clamped by the weight and the first fixing member in a direction along the central axis (L) and in a direction orthogonal to the central axis (L), respectively, and a width in the direction along the central axis (L) is larger than a width in the direction orthogonal to the central axis (L).

Description

Technical Field

[0001] This disclosure relates to a tool holder, a cutting tool, and a method for manufacturing a workpiece used in cutting metal or other workpieces. Background Technology

[0002] As a cutting tool used for machining metal or other workpieces, the cutting tool described in Patent Document 1 is known, for example. The cutting tool described in Patent Document 1 has a tool holder and cutting inserts. The tool holder has: a main body with a cavity, a head that seals the entrance to the cavity, a weight inserted into the cavity as a damping member, and an O-ring located between the head and the weight. Vibration of the tool holder can be reduced by accommodating a weight with a natural vibration frequency different from that of the main body within the main body, and by causing the main body and the weight to vibrate at different frequencies.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2020 / 049167 Summary of the Invention

[0006] A knife handle of one non-limiting example in this disclosure has: a body that is rod-shaped and extends along a central axis from a first end face to a second end face, and has a cavity extending along the central axis; and an internal member inserted into the cavity. The internal member has: a cylindrical weight extending from the first end face towards the second end face; a first fixing member located closer to the first end face than the weight; and a first elastic member located between the weight and the first fixing member. In a cross-section along the central axis, the first elastic member is held by the weight and the first fixing member in both the direction along the central axis and in a direction orthogonal to the central axis, and its width along the central axis is greater than its width in the direction orthogonal to the central axis. Attached Figure Description

[0007] Figure 1 This is a perspective view showing a cutting tool in a non-limiting embodiment of the present disclosure.

[0008] Figure 2 yes Figure 1 The top view of the cutting tool shown.

[0009] Figure 3 yes Figure 2 Sectional view along line III-III.

[0010] Figure 4 yes Figure 3 Enlarged view of the first end face.

[0011] Figure 5 yes Figure 3 Enlarged view of the second end face.

[0012] Figure 6 This is a schematic diagram illustrating one step of a method for manufacturing a machined object in an example that is not limited to this one.

[0013] Figure 7 This is a schematic diagram illustrating one step of a method for manufacturing a machined object in an example that is not limited to this one.

[0014] Figure 8 This is a schematic diagram illustrating one step of a method for manufacturing a machined object in an example that is not limited to this one. Detailed Implementation

[0015] Hereinafter, the manufacturing method of a tool holder, cutting tool, and workpiece as an example embodiment of this disclosure will be described in detail using the accompanying drawings. However, for ease of explanation, only the main components required for describing the embodiment are shown in the following figures. Therefore, the tool holder and cutting tool can have any structural components not shown in the figures. In addition, the dimensions of the components in the figures do not accurately represent the actual dimensions of the constituent components or the dimensional ratios of each component.

[0016] (Cutting tools)

[0017] Figure 1 This is a perspective view showing the cutting tool 10 of Embodiment 1. Figure 2 This is a top view showing the cutting tool 10. The cutting tool 10 has the head 2 mounted on it. Figure 1 A cutting tool is formed from the front end of a cylindrical tool holder 1 extending along the X-axis. A cutting insert (hereinafter referred to as an insert) 3 is mounted on the head 2.

[0018] The cutting tool 10 is, for example, a turning tool. Specific examples include tools for machining external diameters, tools for machining internal diameters, tools for grooving, and tools for parting. The cutting tool 10 can also be a milling tool with a rotating tool side. In the following description, the side of the cutting tool 10 where the head 2 is located is referred to as the front end side, and the side opposite to the front end side is referred to as the rear end side.

[0019] (Handle)

[0020] Figure 3 yes Figure 2 Sectional view along line III-III. Figure 4 yes Figure 3 Enlarged view of the first end face. Figure 5 yes Figure 3 Enlarged view of the second end face.

[0021] like Figure 3 As shown, the tool holder 1 of the cutting tool 10 has a main body 11, a first fixing member 12 as an internal component, a first elastic member 17, a weight 13, a second fixing member 16, a second elastic member 18, and a third elastic member 14. Examples of materials for the tool holder 1 include stainless steel, cast iron, and aluminum alloys. In particular, using steel among these materials improves the toughness of the tool holder 1. Each component will be described in detail below.

[0022] The main body 11 has the appearance of a cylindrical rod extending along the X-axis. The first end face 11a on the head side and the second end face 11b on the rear end side can each have a central opening. The main body 11 has a cavity 11c extending from the first end face 11a toward the second end face 11b along the central axis (axis) L (X-axis direction) of the tool holder 1. The cavity 11c is composed of a large-diameter portion 11d located on the first end face 11a side and a small-diameter portion 11e connected to the large-diameter portion 11d and extending toward the second end face 11b.

[0023] The cavity 11c is formed by perforating the cylindrical substrate made of the aforementioned material. The inner diameter of the small-diameter portion 11e is smaller than the inner diameter of the large-diameter portion 11d. Both the large-diameter portion 11d and the small-diameter portion 11e are cylindrical, and the large-diameter portion 11d has a thinner wall than the small-diameter portion 11e. Figure 2 In the 11d section, the major diameter portion 11d is approximately 2 / 3 of the length of the handle 1, and the minor diameter portion 11e is approximately 1 / 3 of the length of the handle 1. However, the ratio of the lengths of the major diameter portion 11d to the minor diameter portion 11e is not limited to this case.

[0024] The large diameter portion 11d houses a first fixing member 12, a first elastic member 17, a weight 13, a second fixing member 16, a second elastic member 18, and a third elastic member 14.

[0025] The first fixing member 12 is pressed into the large-diameter portion 11d from the first end face 11a of the main body 11, and functions as a cover to seal the opening formed in the first end face 11a. Examples of materials that can be used for the first fixing member 12 include steel, cast iron, and aluminum alloy. Figure 4 As shown, the first fixing member 12 is formed into a generally cylindrical shape with a first hole 12c. It is pressed into the large diameter portion 11d with the axis aligned with the central axis L, and is fixed to the outer peripheral surface of the main body 11 by a pin (not shown).

[0026] The first fixing member 12 has a recess 12b, a first hole 12c, a protrusion 12d, and a front end portion 12e. The front end portion 12e is located on the side of the first end face 11a, and in the direction orthogonal to the central axis L (Z-axis direction), the size (diameter) of the front end portion 12e is larger than the size (diameter) of the large diameter portion 11d.

[0027] A serrated portion is provided on the end face of the front end portion 12e opposite to the head 2. The front end portion 12e has a flange portion 12a on its outer periphery that protrudes radially outward. The surface of the flange portion 12a opposite to the first end face 11a, i.e., the rear end side surface, abuts against the first end face 11a. As a result, the entry of the first fixing member 12 into the interior of the main body 11 is restricted.

[0028] The recess 12b is provided in the form of a circular hole from the center of the end face of the first fixing member 12 opposite to the head 2 toward the rear end. The cylindrical protrusion 24 of the head 2 (described later) is inserted into the recess 12b. An annular fourth elastic member 15 is sandwiched between the recess 12b and the protrusion 24. The fourth elastic member 15 is, for example, an O-ring or a spring, and as a material, examples include rubbers such as NBR (acrylonitrile butadiene rubber) and AU (polyester urethane rubber), and synthetic resins such as epoxy resin.

[0029] The protrusion 24 is fixed to the recess 12b via the fourth elastic member 15. The protrusion 12d is provided to protrude from the end face of the first fixing member 12 toward the rear end, and is formed into a cylindrical shape with the central axis L as the axis. The first hole 12c extends from the recess 12b toward the second end face 11b and passes through the protrusion 12d so that the axis is aligned with the central axis L.

[0030] Return to Figure 3 The weight 13 is housed within the body 11 to reduce vibration of the tool holder 1 generated radially along the tool holder 1. The weight 13 is a damping member. The weight 13 is formed in a generally cylindrical shape (more precisely, a generally cylindrical shape) with a second hole 13c, and is arranged adjacent to the first fixing member 12 within the large diameter portion 11d with its axis aligned with the central axis L. The weight 13 is housed within the large diameter portion 11d with a slight gap between it and the inner circumferential surface of the large diameter portion 11d.

[0031] Materials used for weight 13 can include high-speed steel, cemented carbide, and cermets, among other high-rigidity materials. Cemented carbide compositions include, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and then sintering. WC-TiC-Co is produced by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co is produced by adding tantalum carbide (TaC) to WC-TiC-Co.

[0032] Furthermore, cermets are sintered composite materials formed by incorporating metals into ceramic compositions. Specifically, examples of cermets include those with titanium compounds such as titanium carbide (TiC) or titanium nitride (TiN) as their main components.

[0033] The weight 13 has a recess 13a, a recess 13b, and a second hole 13c. The recess 13a is a circular hole located at the center of the end face on the front side of the weight 13. The recess 13b is a circular hole located at the center of the end face on the rear side of the weight 13. The second hole 13c is provided to connect the recesses 13a and 13b. A flow tube 19 for allowing coolant to flow through the second hole 13c is inserted into it.

[0034] Materials for the flow tube 19 include, for example, metals and resins. Metals include, for example, copper, steel, stainless steel, and aluminum. Resins include, for example, polyethylene, polypropylene, polystyrene, and polyvinyl chloride. Coolants include, for example, non-water-soluble oils such as oil-based, non-active extreme pressure, and active extreme pressure cutting oils, as well as water-soluble oils such as emulsion-type, soluble, and solution-type cutting oils.

[0035] like Figure 4 As shown, the protrusion 12d of the first fixing member 12 is inserted into the inner side of the recess 13a of the weight 13 while the annular first elastic member 17 is externally embedded. The first elastic member 17 may be made of the same material as the fourth elastic member 15. The first elastic member 17 is clamped between the protrusion 12d of the first fixing member 12 and the recess 13a of the weight 13 and is flattened, thereby using its repulsive force to fix the front end of the weight 13 to the first fixing member 12.

[0036] exist Figure 4In the cross-section (along the central axis L), the first elastic member 17 is held in the direction along the central axis L (X-axis direction) by the rear end face of the first fixing member 12 and the bottom surface of the recess 13a of the weight 13. In this way, with the first elastic member 17 held in the X-axis direction by the first fixing member 12 and the weight 13, the cutting load (e.g., back force) applied from the first fixing member 12 to the weight 13 along the X-axis direction can be mitigated in the first elastic member 17.

[0037] In a cross-section along the central axis L, the first elastic member 17 is held in a direction orthogonal to the central axis L (Z-axis direction) by the outer peripheral surface of the protrusion 12d and the inner peripheral surface of the recess 13a. In this way, when the first elastic member 17 is held in the Z-axis direction by the first fixing member 12 and the weight 13, the cutting load (e.g., main component force and feed component force) applied from the first fixing member 12 to the weight 13 along the Z-axis direction can be mitigated within the first elastic member 17.

[0038] As described above, the weight 13 is housed within the main body 11 to reduce vibration of the handle 1 generated radially along its direction. Here, in Figure 4 In the cross-section along the central axis L shown, when the width a in the X-axis direction of the first elastic member 17 is greater than the width b in the Z-axis direction, the cutting load can be mitigated in the first elastic member 17, and the vibration reduction effect brought about by the weight 13 can be improved. The fact that the width a in the X-axis direction of the first elastic member 17 is greater than the width b in the Z-axis direction can also be expressed as the first elastic member 17 being a slender, flat shape in the X-axis direction.

[0039] When the width b in the Z-axis direction is relatively small, the deformation of the first elastic member 17 in the Z-axis direction is small. Therefore, when the weight 13 vibrates in the Z-axis direction, the end of the weight 13 that connects to the first elastic member 17 easily functions as a so-called fixed end. Thus, damage to the weight 13 can be avoided, and the vibration reduction effect of the weight 13 can be improved. Furthermore, since not only is the area of ​​the first elastic member 17 in the cross-section along the central axis L reduced, but the width a in the X-axis direction is also large, the first elastic member 17 is less prone to deterioration, and the effect of the first elastic member 17 in mitigating cutting loads can also be ensured. The ratio of width a to width b, a / b, can be 1.1 or more and 3 or less.

[0040] like Figure 5As shown, a second fixing member 16 is disposed within the large-diameter portion 11d of the cavity 11c, on the rear end side of the weight 13. The second fixing member 16 fixes the weight 13 relative to the inner circumferential surface of the large-diameter portion 11d via the third elastic member 14. The second fixing member 16 is formed into a generally cylindrical shape with a cavity for inserting the flow tube 19, and is disposed within the large-diameter portion 11d with its axis aligned with the central axis L.

[0041] Examples of materials that can be used for the second fixing member 16 include metals and resins. Examples of metals include steel, cast iron, and aluminum alloys. Examples of resins include polyethylene, polypropylene, polystyrene, and polyvinyl chloride.

[0042] The second fixing member 16 has a protrusion 16a and a groove 16b. The protrusion 16a is provided to protrude from the center of the end face of the second fixing member 16 opposite to the weight 13 toward the weight 13, and is formed in a cylindrical shape. The groove 16b is provided to surround the outer peripheral surface of the second fixing member 16 in a circumferential direction opposite to the inner peripheral surface of the large diameter portion 11d.

[0043] A third elastic member 14 is embedded in the groove 16b of the second fixing member 16. The third elastic member 14 is, for example, an O-ring, and may have the same material as the fourth elastic member 15.

[0044] like Figure 5 As shown, the protrusion 16a of the second fixing member 16 is inserted into the inner side of the recess 13b while the annular second elastic member 18 is externally embedded. The second elastic member 18 may have the same material as the fourth elastic member 15.

[0045] The second elastic member 18 is clamped and flattened by the protrusion 16a of the second fixing member 16 and the recess 13b of the weight 13. Utilizing the resulting repulsive force, the rear end of the weight 13 is fixed to the second fixing member 16. The third elastic member 14 contacts and is flattened by the inner circumferential surface of the large-diameter portion 11d of the cavity 11c. Utilizing the resulting repulsive force, the second fixing member 16 is fixed to the large-diameter portion 11d. That is, the weight 13 is integrated with the first fixing member 12 and the second fixing member 16 through which its two ends are held and fixed to the large-diameter portion 11d, and thus fixed relative to the large-diameter portion 11d.

[0046] exist Figure 5In the cross-section (along the central axis L), the second elastic member 18 is held in the X-axis direction by the bottom surface of the recess 13b of the weight 13 and the front end side surface of the second fixing member 16. In this way, with the second elastic member 18 held in the X-axis direction by the second fixing member 16 and the weight 13, the cutting load (e.g., back force) applied from the second fixing member 16 to the weight 13 along the X-axis direction can be mitigated in the second elastic member 18.

[0047] The second elastic member 18 is held in the Z-axis direction by the inner peripheral surface of the recess 13b and the outer peripheral surface of the protrusion 16a. In this way, when the second elastic member 18 is held in the Z-axis direction by the second fixing member 16 and the weight 13, the cutting load (e.g., main component force and feed component force) applied from the second fixing member 16 to the weight 13 along the Z-axis direction can be mitigated in the second elastic member 18.

[0048] As described above, the weight 13 is housed within the main body 11 to reduce vibration of the handle 1 generated radially along its direction. Here, in Figure 5 In the cross-section along the central axis L shown, when the width c in the X-axis direction of the second elastic member 18 is greater than the width d in the Z-axis direction, the cutting load can be mitigated in the second elastic member 18, and the vibration-reducing effect of the weight 13 can be improved. The fact that the width c in the X-axis direction of the second elastic member 18 is greater than the width d in the Z-axis direction can also be interpreted as the second elastic member 18 being a slender, flat shape in the X-axis direction.

[0049] When the width b in the Z-axis direction is relatively small, the deformation of the second elastic member 18 in the Z-axis direction is small. Therefore, when the weight 13 vibrates in the Z-axis direction, the end of the weight 13 that connects to the second elastic member 18 easily functions as a so-called fixed end. Thus, damage to the weight 13 can be avoided, and the vibration reduction effect of the weight 13 can be improved. Furthermore, since not only is the area of ​​the second elastic member 18 in the cross-section along the central axis L reduced, but the width a in the X-axis direction is also large, the second elastic member 18 is less prone to deterioration, and the effect of the second elastic member 18 in mitigating cutting loads can also be ensured. The ratio of width c to width d, c / d, can be 1.1 or more and 3 or less.

[0050] like Figure 3 As shown, the diameter of the opening on the second end face 11b of the main body 11 is approximately the same as the diameter of the small diameter portion 11e. Coolant is injected into the small diameter portion 11e through this opening. This opening is sealed by a plug 20. Figure 4As shown, the front end of the flow tube 19 enters the first hole 12c, which is connected to the second hole 13c. The injected coolant passes through the flow tube 19 and is ejected from the ejector section 23 of the head 2 (described later) during processing.

[0051] (head)

[0052] like Figures 1-3 As shown, the head 2 has a mounting portion 21 formed in a generally cylindrical shape, and an assembly portion 22 formed in a polyhedral shape and protruding from the front end face of the mounting portion 21 along the X-axis direction. The mounting portion 21 is mounted on the front end of the tool holder 1 with its axis aligned with the central axis L of the tool holder 1. A serrated portion is provided on the end face of the mounting portion 21 on the tool holder 1 side. The serrated portion provided on the mounting portion 21 engages with the serrated portion formed on the end face of the front end side of the first fixing member 12. With the serrated portions engaged, the head 2 is mounted to the tool holder 1 using screws (not shown) or the like.

[0053] A spray section 23 is provided on the front end face of the mounting section 21. The spray section 23 has an opening from which coolant is sprayed. A protrusion 24 is provided at the center of the rear end face of the mounting section 21, protruding toward the first fixing member 12. The front end of the protrusion 24 is connected to the spray section 23 (not shown). As described above, the internal space of the protrusion 24 communicates with the internal space of the flow pipe 19 via the first hole 12c of the first fixing member 12. The coolant injected into the small diameter section 11e flows through the flow pipe 19 within the protrusion 24 and is sprayed toward the workpiece from the spray section 23 during machining.

[0054] A cutting groove 22a is provided at one end in the Y-axis direction when viewed from above in the Z-axis direction of the assembly part 22. The cutting groove 22a has a support surface (not shown) for mounting the bottom surface of the blade 3 and constraint surfaces that abut against the two sides of the blade 3 for constraint. The shape of the blade 3 is not limited to a specific structure. For example, the shape of the blade 3 can be a rod shape, a polygonal plate shape, or a polygonal prism shape. In this embodiment, the blade 3 is as follows: Figure 1 As shown, it is in the shape of a rhomboid plate.

[0055] One corner of the rhombus-shaped blade 3 is removed to form the cutting edge 3a. Examples of materials for the blade 3 include cemented carbide and cermet. The cemented carbide and cermet can have the same composition as the material of the aforementioned weight 13. A through hole is provided in the center of the blade 3. The bottom surface of the rhombus is placed on a support surface, and a screw is passed through the through hole and threaded onto the support surface, thereby fixing the blade 3 to the tool groove 22a.

[0056] (Manufacturing method for machined parts)

[0057] Next, the manufacturing method of the machined workpiece according to the embodiments will be described using the accompanying drawings. Figure 6 This is a schematic diagram illustrating one step of a manufacturing method for a machined workpiece 103 in an example that is not limited to this one. Figure 7 This is a schematic diagram illustrating one step of a manufacturing method for a machined workpiece 103 in an example that is not limited to this one. Figure 8 This is a schematic diagram illustrating one step of a manufacturing method for a machined workpiece 103 in an example that is not limited to this one.

[0058] The workpiece 103 is manufactured by machining the workpiece 101. In this embodiment, outer diameter machining is exemplified as the machining process. The manufacturing method of the workpiece 103 in this embodiment includes the following steps:

[0059] (1) The process of rotating the workpiece 101;

[0060] (2) The process of bringing the cutting tool 10, as exemplified by the above-described embodiment, into contact with the rotating workpiece 101; and

[0061] (3) The process of removing the cutting tool 10 from the workpiece 101.

[0062] More specifically, firstly, such as Figure 6 As shown, the workpiece 101 is rotated about axis D in the D1 direction. Furthermore, by moving the cutting tool 10 in the D2 direction, the cutting tool 10 is brought relatively close to the workpiece 101. Next, as... Figure 7 As shown, the cutting edge 3a in the cutting tool 10 is brought into contact with the workpiece 101 to cut the workpiece 101.

[0063] At this point, the outer diameter can be machined by moving the cutting tool 10 in the D3 direction while cutting the workpiece 101. Then, as... Figure 6 As shown, by moving the cutting tool 10 in the D4 direction, the cutting tool 10 is moved relatively away from the workpiece 101 being cut.

[0064] exist Figure 6 In this configuration, the cutting tool 10 can be brought close while the workpiece 101 is rotated and the axis D is fixed. Additionally, in... Figure 7 In this process, the workpiece 101 is cut by bringing the cutting edge 3a of the insert 3 into contact with the rotating workpiece 101. Additionally, in... Figure 8 In the process, the cutting tool 10 is moved away from the workpiece 101 while the workpiece 101 is rotated.

[0065] As described above, in this embodiment, the cross-sections of the first elastic member 17 and the second elastic member 18 are elongated and flat in the direction along the central axis L, thus reducing the vibration of the body 11 in the direction orthogonal to the central axis L.

[0066] In the cutting process of the manufacturing method of the embodiment, the cutting tool 10 is brought into contact with the workpiece 101 by moving the cutting tool 10. Furthermore, the cutting tool 10 is moved away from the workpiece 101 by moving the cutting tool 10. However, the manufacturing method of the embodiment is not limited to this.

[0067] For example, in step (1), the workpiece 101 can be brought close to the cutting tool 10. In step (3), the workpiece 101 can be moved away from the cutting tool 10. When the cutting process is continuously performed, the cutting tool 10 is kept rotating, and the steps of bringing the insert 3 into contact with different parts of the workpiece 101 are repeated.

[0068] Representative examples of the materials used for the workpiece 101 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0069] The invention disclosed herein has been described above based on the accompanying drawings and embodiments. However, the invention disclosed herein is not limited to the embodiments described above. That is, the invention disclosed herein can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of the invention disclosed herein.

[0070] That is, it should be noted that various modifications or alterations can be easily made based on this disclosure by those skilled in the art. Furthermore, it should be noted that these modifications or alterations are included within the scope of this disclosure. For example, in the above embodiment, the case where the shank 1 of the cutting tool 10 is a round bar shape has been described, but it could also be a square bar shape. Additionally, regarding both the first elastic member 17 and the second elastic member 18, the case where the cross-section is an elongated, flat shape along the central axis L has been described, but either one could also be a flat shape.

[0071] Explanation of reference numerals in the attached figures

[0072] 1. Tool holder; 11. Body; 11a. First end face; 11b. Second end face; 11c. Hole; 12. First fixing member; 12a. Flange; 12d. Protrusion; 13. Weight; 13a, 13b. Recess; 14. Third elastic member; 15. Fourth elastic member; 16. Second fixing member; 17. First elastic member; 18. Second elastic member; 16a. Protrusion; 16b. Groove; 2. Head; 24. Protrusion; 3. Blade; 3a. Cutting edge; 10. Cutting tool.

Claims

1. A knife handle, wherein, The knife handle has: The main body is rod-shaped, extending along a central axis from a first end face to a second end face, and has a cavity extending along the central axis; and Internal components that are inserted into the cavity. The internal component has: A cylindrical weight extending from the first end face toward the second end face; A first fixing member is located closer to the first end face than the weight; and A first elastic member is located between the weight and the first fixed member. In a cross-section along the central axis, the first elastic member is clamped by the weight and the first fixing member in the direction along the central axis and in the direction orthogonal to the central axis, respectively, and the width of the first elastic member in the direction along the central axis is greater than the width in the direction orthogonal to the central axis.

2. The knife handle according to claim 1, wherein, In a cross-section along the central axis, the first elastic member abuts against the weight and the first fixing member in a direction along the central axis and in a direction orthogonal to the central axis, respectively.

3. The knife handle according to claim 1 or 2, wherein, The first fixing member has a front end portion located on the first end face side. In a direction orthogonal to the central axis, the size of the front end is larger than the size of the cavity.

4. The knife holder according to claim 3, wherein, The portion of the front end that is opposite to the periphery of the first end face abuts against the first end face.

5. The knife handle according to claim 1 or 2, wherein, The internal component also has: A second fixing member is located closer to the second end face than the weight; and The second elastic member is located between the weight and the second fixed member. In a cross-section along the central axis, the second elastic member is clamped by the weight and the second fixing member in the direction along the central axis and in the direction orthogonal to the central axis, respectively, and the width of the second elastic member in the direction along the central axis is greater than the width in the direction orthogonal to the central axis.

6. The knife holder according to claim 5, wherein, In a cross-section along the central axis, the second elastic member abuts against the weight and the second fixing member in a direction along the central axis and in a direction orthogonal to the central axis, respectively.

7. The knife handle according to claim 5, wherein, The tool holder also has a third elastic member, which is located between the main body and the second fixing member, and abuts against the main body and the second fixing member in a direction orthogonal to the central axis. The first fixing member is pressed into the cavity.

8. A cutting tool, wherein, The cutting tool has: The knife handle as described in claim 1 or 2; and The cutting blade located on the first end face side of the tool holder.

9. A method for manufacturing a workpiece by cutting, wherein, The method for manufacturing the workpiece includes: The process of rotating the workpiece; The process of bringing the cutting tool of claim 8 into contact with the rotating workpiece; and The process of removing the cutting tool from the workpiece.

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