Holder, cutting tool, and manufacturing method of cutting object

Abstract

To provide a holder which achieves high vibration control performance while holding a weight stably.SOLUTION: A holder has a body having a cavity, a weight, a holding member, and an elastic member. The weight is located in the cavity and extends along a center axis. The weight has a plurality of split weight members split in a circumferential direction around the center axis. The holding member has an annular shape and is placed in contact with an outer surface of the weight. The elastic member has an annular shape and is placed in contact with the outer surface of the weight and an inner peripheral surface of the cavity.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a holder, a cutting tool, and a method for manufacturing a machined product. [Background technology]

[0002] Various holders equipped with vibration-proof mechanisms have been proposed in the past, as shown in Patent Documents 1 and 2. Patent Document 2 describes a vibration-damping mechanism (vibration-proof mechanism) that includes a weight housed in a cylindrical hollow portion formed inside a shaft portion (tool holder) and divided into multiple weight members in the circumferential direction around the shaft center of the hollow portion, and a biasing member that biases the weight members toward the shaft center so that the divided surfaces of adjacent weight members come into surface contact with each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 6-505322 [Patent Document 2] JP 2012-057752 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the vibration-damping mechanism described in Patent Document 2, if the elastic modulus of the biasing member is low, gaps are likely to occur between some of the multiple weight members and the biasing member. This may cause coolant to flow into the hollow portion or oil filled in the hollow portion to leak out. In addition, in the vibration-damping mechanism described in Patent Document 2, if the elastic modulus of the biasing member is high, the vibration-damping performance of the multiple weight members may decrease.

[0005] One of the objectives of the present disclosure is to provide a holder that has high vibration isolation performance while stably holding a weight. [Means for solving the problem]

[0006] A non-limiting example of a holder of the present disclosure has a body having a shape extending from a first end to a second end along a central axis, a pocket located on the side of the first end into which a cutting insert can be attached, and a cavity located closer to the second end than the pocket and extending along the central axis, a weight located inside the cavity, extending along the central axis, and having a plurality of divided weight members divided circumferentially around the central axis, an annular retaining member into which the weight is inserted and abutted against the outer surface of the weight, and an annular elastic member into which the weight is inserted and abutted against the outer surface of the weight and the inner surface of the cavity. Effect of the Invention

[0007] A holder according to a non-limiting example of the present disclosure is capable of stably holding a weight and has high vibration isolation performance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a cutting tool according to a non-limiting embodiment of the present disclosure. [Diagram 2] FIG. 2 is a side view of the cutting tool shown in FIG. [Diagram 3] FIG. 2 is a perspective view of a holder in the cutting tool shown in FIG. [Figure 4] FIG. 4 is a side view of the holder shown in FIG. [Diagram 5] 5 is a V-sectional view of the holder shown in FIG. 4. [Figure 6] 6 is an enlarged cross-sectional view of a portion of the holder shown in FIG. 5. [Figure 7] 4 is a perspective view of a vibration-isolating member in the holder shown in FIG. 3. [Figure 8] 8 is a partial cross-sectional view of the vibration-proof member shown in FIG. 7. [Figure 9] FIG. 8 is an exploded perspective view of the vibration-proof member shown in FIG. [Figure 10] 8 is a front view of the vibration-proof member shown in FIG. 7, viewed from the first end side. [Figure 11] 11 is a side view of the vibration-proof member shown in FIG. 10 as viewed from the A1 direction. [Figure 12] 11 is a side view of the vibration-proof member shown in FIG. 10 as viewed from the A2 direction. [Figure 13] 11 is a cross-sectional view of the vibration-proof member shown in FIG. 10 taken along the line X. [Figure 14] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. [Figure 15] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. [Figure 16] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Holder> Hereinafter, the holder 1 of a number of non-limiting embodiments of the present disclosure will be described in detail with reference to the drawings. However, for the sake of convenience, each of the drawings referred to below shows only the main members necessary for explaining each embodiment in a simplified manner. Therefore, the holder 1 may include any component member not shown in each of the drawings referred to. Furthermore, the dimensions of the members in each drawing do not faithfully represent the dimensions and dimensional ratios of the actual components. These points are the same in the manufacturing method of the cutting tool and the machined product described later.

[0010] A cutting tool 101 is used in cutting a workpiece to manufacture a machined product. FIG. 1 is a perspective view showing the cutting tool 101 according to a non-limiting embodiment of the present disclosure. FIG. 2 is a side view of the cutting tool 101 shown in FIG. 1. As a non-limiting example shown in FIGS. 1 and 2, the cutting tool 101 generally has a cutting insert 103 (hereinafter, also simply referred to as "insert 103") and a holder 1. The insert 103 has a function of contacting the workpiece to cut the workpiece. The holder 1 can be used to hold the insert 103.

[0011] <Main body> The holder 1 has a main body 3, a weight 5, a holding member 7, and an elastic member 9. Here, the configuration of the holder 1 excluding the main body 3 and mainly including the weight 5, the holding member 7, and the elastic member 9 is referred to as a vibration-proof member 51.

[0012] Fig. 3 is a perspective view of the holder 1 in the cutting tool 101 shown in Fig. 1. Fig. 4 is a side view of the holder 1 shown in Fig. 3. Fig. 5 is a V-sectional view of the holder 1 shown in Fig. 4. The main body 3 may have a shape extending from a first end 3a to a second end 3b along the central axis O1, as in a non-limiting example shown in Figs. 3 to 5. One example of such a shape is a rod shape.

[0013] Generally, the first end 3a is referred to as the "front end" and the second end 3b is referred to as the "rear end". The main body 3 may be, for example, cylindrical or polygonal prism-shaped. In a non-limiting example shown in Figs. 3 to 5, the main body 3 is cylindrical. Examples of materials for the main body 3 include steel, cast iron, and aluminum alloy.

[0014] The size of the main body 3 may be set appropriately depending on the size of the workpiece. 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. Also, the width (diameter) of the main body 3 in the direction perpendicular to the central axis O1 may be set to about 6 mm or more and 250 mm or less.

[0015] Fig. 6 is an enlarged cross-sectional view of a portion of the holder 1 shown in Fig. 5. The main body 3 may have a pocket 11 and a cavity 13, as in the non-limiting example shown in Figs. 3 to 6. The pocket 11 may be located on the first end 3a side of the main body 3. The pocket 11 is a portion of the holder 1 to which the insert 103 is attached, and the insert 103 can be attached. The pocket 11 may be a recessed portion on the first end 3a side of the main body 3 before the insert 103 is attached.

[0016] The number of pockets 11 may be one or more. When there is more than one pocket 11, the number may be 2 to 10. In a non-limiting example shown in Figures 3 to 6, the main body 3 has one pocket 11.

[0017] The cavity 13 may extend along the central axis O1 in the main body 3. The cavity 13 is located closer to the second end 3b than the pocket 11, and does not need to be located locally at the end of the main body 3 on the side of the second end 3b. As a non-limiting example shown in FIG. 5, the cavity 13 may be located up to the first end 3a side from the center of the main body 3 in the direction along the central axis O1. The cavity 13 can be used as a space to accommodate the weight 5. The cavity 13 may be, for example, cylindrical or polygonal tubular.

[0018] <weight> FIG. 7 is a perspective view of vibration-proof member 51 in holder 1 shown in FIG. 3. FIG. 8 is a partial cross-sectional view of vibration-proof member 51 shown in FIG. 7. FIG. 9 is an exploded perspective view of vibration-proof member 51 shown in FIG. 7. FIG. 10 is a front view of vibration-proof member 51 shown in FIG. 7, viewed from the first end 3a side. FIG. 11 is a side view of vibration-proof member 51 shown in FIG. 10, viewed from direction A1. FIG. 12 is a side view of vibration-proof member 51 shown in FIG. 10, viewed from direction A2. FIG. 13 is an X-sectional view of vibration-proof member 51 shown in FIG. 10.

[0019] As a non-limiting example shown in Figs. 3 to 13, the holder 1 may have a weight 5 located inside the cavity 13. The weight 5 is capable of vibrating inside the cavity 13. When the weight 5 vibrates in response to chatter vibrations occurring during cutting, energy caused by the chatter vibrations in the main body 3 may be transmitted to the weight 5. Furthermore, when the weight 5 vibrates so as to cancel out the chatter vibrations of the main body 3, the chatter vibrations can be further suppressed.

[0020] The weight 5 may extend along the central axis O1 in the cavity 13. The weight 5 can function as a member that receives energy of chatter vibration of the main body 3. Examples of materials for the weight 5 include, but are not limited to, high-speed steel, tungsten (W), cemented carbide, and cermet. The specific gravity of the material for the weight 5 may be greater than the specific gravity of the material for the main body 3.

[0021] Examples of cemented carbide compositions include WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering the mixture. 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.

[0022] A cermet is a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet includes a cermet whose main component is a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN).

[0023] The weight 5 may have a plurality of divided weight members 15 divided in the circumferential direction around the central axis O1. Each of the plurality of divided weight members 15 may extend along the central axis O1. The plurality of divided weight members 15 may be, for example, columnar in shape. In a non-limiting example shown in FIG. 9, each of the plurality of divided weight members 15 is in the shape of a plate having a semicircular arc end face. The lengths of the respective divided weight members 15 in the direction along the central axis O1 may be the same or different.

[0024] Furthermore, the multiple divided weight members 15 may be configured to be rotationally symmetrical about the central axis O1 when viewed from a direction along the central axis O1. In other words, when the multiple divided weight members 15 are rotated about the central axis O1, one of the multiple divided weight members 15 overlaps with another, and the shapes may match.

[0025] <Retaining material> As a non-limiting example shown in Fig. 3 to Fig. 13, the holder 1 may have an annular holding member 7 located inside the cavity 13. The holding member 7 is a member that holds the weight 5 composed of a plurality of divided weight members 15. By having the holder 1 have the above-mentioned holding member 7, even if the weight 5 is composed of a plurality of divided weight members 15, it becomes easy to handle the weight 5 as a single unit without the need to join the divided weight members 15 together.

[0026] The weight 5 is inserted into the annular holding member 7 so as to abut against the outer surface of the weight 5. The weight 5 is inserted into the annular holding member 7 so as to abut against the outer surface of the weight 5. At this time, the weight 5 may be inserted into the holding member 7 so that a pressing force toward the central axis O1 is applied to each of the multiple divided weight members 15 from the holding member 7.

[0027] Examples of the material of the holding member 7 include metals and resins. Examples of the metals include copper, steel, stainless steel, aluminum, etc. Examples of the resins include polyethylene, polypropylene, polystyrene, and polyvinyl chloride.

[0028] <Elastic material> As a non-limiting example shown in Fig. 3 to Fig. 13, the holder 1 may have an annular elastic member 9 located inside the cavity 13. The elastic member 9 is a member that supports the vibration of the weight 5 inside the cavity 13. Therefore, the elastic member 9 abuts against the weight 5 and the main body 3. As an example shown in Fig. 6, the elastic member 9 may be abutted against the outer surface of the weight 5 and the inner peripheral surface of the cavity 13 with the weight 5 inserted therein.

[0029] The elastic member 9 deforms in response to the vibrations of the main body 3 and the weight 5, so that the chatter vibration of the main body 3 is easily transmitted to the weight 5 via the elastic member 9, and the energy of the chatter vibration can be absorbed in the elastic member 9. The energy of the chatter vibration transmitted from the main body 3 to the weight 5 and the elastic member 9 can be converted into sound and heat. The chatter vibration can be reduced by converting the energy in this way.

[0030] In addition, when the chatter vibration of the main body 3 is transmitted to the weight 5 via the elastic member 9, the elastic member 9 is more easily elastically deformed than the main body 3, the weight 5, and the holding member 7, so that a time lag in the phase of the vibration is likely to occur in the elastic member 9, and the vibration mode can be converted. Therefore, the weight 5 is likely to vibrate in a manner that offsets the chatter vibration of the main body 3.

[0031] The weight 5 is inserted into the annular elastic member 9 so as to be in contact with the outer surface of the weight 5. At this time, the weight 5 may be inserted into the elastic member 9 so that a pressing force toward the central axis O1 is applied from the elastic member 9 to each of the multiple divided weight members 15.

[0032] The elastic member 9 being a member that is more easily elastically deformed than the main body 3, the weight 5, and the holding member 7 means that the elastic member 9 has a structure or material that is relatively more easily elastically deformed. Specifically, the elastic member 9 can be, for example, an O-ring or a spring. Examples of materials for the O-ring include rubber and resin. Examples of rubber include NBR (acrylonitrile butadiene rubber) and AU (polyester urethane rubber). Examples of materials for the spring include metals such as steel and cast iron.

[0033] In the holder 1 of this embodiment, the holding member 7 and the elastic member 9 are located inside the cavity 13. If only one of the members is provided instead of these two members, it is difficult to achieve both the functions of the holding member 7 and the elastic member 9 with a single member.

[0034] For example, if the function as the holding member 7 is the main focus, the function as the elastic member 9 will be insufficient. That is, the weight 5 will have difficulty vibrating to offset the chatter vibration of the main body 3, and there is a risk that the effect of the weight 5 in damping the chatter vibration will be insufficient.

[0035] Furthermore, if the focus is on the function as the elastic member 9, the function as the holding member 7 may become insufficient. That is, it becomes difficult to stably hold the divided weight members 15, and a gap may occur between a part of the divided weight members 15 and the elastic member 9, causing the divided weight members 15 to shift in position. Furthermore, if a coolant flows inside the main body 3, the coolant may flow into the cavity 13, and if the cavity 13 is filled with oil, the oil may flow out.

[0036] On the other hand, when the retaining member 7 and the elastic member 9 are positioned inside the cavity 13 as in the holder 1 of this embodiment, each member can function independently of the other, and therefore can perform both the function as the retaining member 7 and the function as the elastic member 9 well.

[0037] 6, in a case where the retaining member 7 and the elastic member 9 are located inside the cavity 13, the elastic member 9 may be in contact with the inner peripheral surface of the cavity 13 of the main body 3, while the retaining member 7 may be spaced apart from the inner peripheral surface of the cavity 13. When the retaining member 7 is spaced apart from the inner peripheral surface of the cavity 13 and there is a gap between the retaining member 7 and the inner peripheral surface, the weight 5 is likely to vibrate. Therefore, the vibration-proofing function of the weight 5 is improved compared to when the retaining member 7 is in contact with the inner peripheral surface.

[0038] 13, in a cross section taken along the central axis O1, the width W11 of the elastic member 9 in a direction perpendicular to the central axis O1 may be larger than the width W21 of the retaining member 7 in a direction perpendicular to the central axis O1. In this case, it is easy to configure the elastic member 9 to abut against the inner circumferential surface of the cavity 13 of the main body 3 while the retaining member 7 is separated from the inner circumferential surface of the cavity 13, without making the weight 5 into a complex shape.

[0039] There is not necessarily just one cross section when cut along the central axis O1, but one cross section when cut along the central axis O1 may be defined as any one cross section when cut along the central axis O1.

[0040] 13, the width W12 of the elastic member 9 in the direction along the central axis O1 may be larger than the width W22 of the holding member 7 in the direction along the central axis O1. In this case, the area where the elastic member 9 and the weight 5 come into contact with each other is likely to be large. This makes it difficult for the divided weight member 15 to shift in position. In addition, coolant is unlikely to flow into the cavity 13, and oil is unlikely to flow out of the cavity 13.

[0041] The holder 1 may have one each of the holding member 7 and the elastic member 9, or may have a plurality of them as in a non-limiting example shown in Fig. 9. The holder 1 in the example shown in Fig. 9 has a plurality of holding members 7, and the plurality of holding members 7 have a first holding member 17 and a second holding member 19. The holder 1 also has a plurality of elastic members 9, and the plurality of elastic members 9 have a first elastic member 21 and a second elastic member 23.

[0042] The first holding member 17 and the first elastic member 21 may be located on the first end 3a side of the weight 5. The first holding member 17 and the first elastic member 21 may be located at the end of the weight 5 on the first end 3a side. The second holding member 19 and the second elastic member 23 may be located on the second end 3b side of the weight 5. The second holding member 19 and the second elastic member 23 may be located at the end of the weight 5 on the second end 3b side. When the holding member 7 is located at each end of the first end 3a side and the second end 3b side, the divided weight member 15 can be held more stably. When the elastic member 9 is located at each end of the first end 3a side and the second end 3b side, the weight 5 is more likely to vibrate, and the vibration-proofing function is further improved.

[0043] In the case where the above-mentioned first holding member 17 and first elastic member 21 are provided, the first elastic member 21 may be positioned closer to the first end 3a than the first holding member 17. When the first elastic member 21 and the first holding member 17 are in the above-mentioned positional relationship, the first holding member 17 is less likely to come off the weight 5 on the side of the first end 3a. Therefore, the divided weight member 15 can be held more stably.

[0044] For the same reason, in the case where the above-mentioned second holding member 19 and second elastic member 23 are provided, the second elastic member 23 may be positioned closer to the second end 3b than the second holding member 19. The second holding member 19 is less likely to come off the weight 5 on the second end 3b side. Therefore, the divided weight member 15 can be held more stably.

[0045] 13, the holding member 7 may be sandwiched between the elastic member 9 and the weight 5 in the direction along the central axis O1. When the weight 5, the holding member 7, and the elastic member 9 are positioned in this manner, the holding member 7 is less likely to become misaligned. For example, as shown in FIG. 13, the first holding member 17 may be sandwiched between the first elastic member 21 and the weight 5 in the direction along the central axis O1, and the second holding member 19 may be sandwiched between the second elastic member 23 and the weight 5 in the direction along the central axis O1.

[0046] The holding member 7 and the elastic member 9 are annular members as described above. In this case, the cross-sectional shapes of the holding member 7 and the elastic member 9 in a cross section cut along the central axis O1 are not limited to a specific configuration. As a non-limiting example shown in FIG. 13, the cross-sectional shape of the holding member 7 in a cross section cut along the central axis O1 may be a square. In this case, a wide area where the holding member 7 and the weight 5 come into contact with each other is easily ensured. As a result, the divided weight member 15 is less likely to be misaligned.

[0047] In this case, the width W22 of the retaining member 7 in the direction along the central axis O1 may be larger than the width W21 of the retaining member 7 in the direction perpendicular to the central axis O1. In this case, it is easy to ensure that both the area where the retaining member 7 and the weight 5 contact each other and the gap between the retaining member 7 and the inner peripheral surface of the cavity 13 are wide.

[0048] 13, the elastic member 9 may have a circular cross-sectional shape in a cross section taken along the central axis O1. In this case, the elastic member 9 is easily deformed, and a gap is unlikely to occur between the elastic member 9 and the weight 5. This improves the vibration-proofing function of the weight 5. In addition, coolant is unlikely to flow into the cavity 13, and oil is unlikely to flow out of the cavity 13.

[0049] As a non-limiting example shown in Fig. 6, the main body 3 may further include a tube 25 located inside the main body 3, extending along a central axis O1, and having a flow path 25a. The flow path 25a can be used to flow a coolant. The shape of the flow path 25a is not particularly limited as long as it can flow the coolant. Figs. 5 and 6 are cross-sections taken along the central axis O1.

[0050] The shape of the cross section of the flow passage 25a perpendicular to the flow direction of the coolant is circular, but the shape of the cross section of the flow passage 25a may be, for example, elliptical or polygonal. The diameter of the flow passage 25a may be set to, for example, 1 mm or more and 10 mm or less.

[0051] The coolant may be, for example, a water-insoluble oil or a water-soluble oil, and may be appropriately selected and used depending on the material of the workpiece. Examples of water-insoluble oils include oil-based, inactive extreme pressure, and active extreme pressure cutting oils. Examples of water-soluble oils include cutting oils such as emulsions, solubles, and solutions. The coolant is not limited to a liquid, and may be a gas such as an inert gas.

[0052] 6, the flow passage 25a may have a coolant inlet 27. In a non-limiting example shown in Fig. 13, the inlet 27 may be located on an end face of the main body 3 on the side of the second end 3b. The location of the inlet 27 is not limited to the end face, and may be, for example, on the outer circumferential surface of the main body 3.

[0053] 6, the flow path 25a may be connected to the cavity 13. In other words, a part of the tube 25 may pass through the inside of the cavity 13. In the non-limiting example shown in FIG. 6, the flow path 25a extends in a linear shape from the inlet 27 toward the first end 3a and is connected to the cavity 13.

[0054] The holder 1 may further include a washer located between the holding member 7 and the weight 5 in the direction along the central axis O1. When such a washer is included, the amount of compression of the elastic member 9 can be adjusted.

[0055] <Cutting tools> Next, a cutting tool 101 according to a non-limiting embodiment will be described in detail with reference to FIGS. 1 and 2, taking as an example a case where the cutting tool 101 includes the holder 1 described above.

[0056] 1 and 2, a cutting tool 101 in a non-limiting example may include a holder 1 and an insert 103 attached to the holder 1. The cutting tool 101 includes the holder 1 with high vibration-proofing performance, and therefore can exhibit excellent cutting performance.

[0057] 1 and 2, the insert 103 may have a polygonal plate shape. The shape of the insert 103 is not limited to a polygonal plate shape.

[0058] In a non-limiting example shown in FIG. 2, the insert 103 may have a cutting edge 105. The insert 103 may be positioned in the pocket 11 such that the cutting edge 105 protrudes 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 a workpiece. In a 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 body 3. When the cutting edge 105 protrudes laterally in this manner, only the vicinity of the cutting edge 105 can be brought into contact with the workpiece.

[0059] The insert 103 in the non-limiting example shown in Fig. 1 may further have a through hole 107. Moreover, 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. The fixing member 109 is not limited to a screw and may be, for example, a clamp member or the like.

[0060] 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 a screw into the through hole 107 of the insert 103 and fixing the screw to the screw hole of the holder 1. In the non-limiting example shown in FIG. 1, the through hole 107 and the screw hole may extend in a direction perpendicular to the central axis O1.

[0061] The material of the insert 103 may include, for example, cemented carbide and cermet. The composition of the cemented carbide may include, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co may be produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering the mixture. WC-TiC-Co may be produced by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co may be produced by adding tantalum carbide (TaC) to WC-TiC-Co.

[0062] The cermet may also be a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be one whose main component is a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN).

[0063] 1 to 4, the cutting tool 101 includes the holder 1, but is not limited to this embodiment. For example, the cutting tool 101 may include the holder 1 of another embodiment.

[0064] <Method of manufacturing machined products> Next, a method for manufacturing a machined product 203 according to a non-limiting embodiment will be described in detail with reference to Figs. 14 to 16. Figs. 14 to 16 are each a schematic diagram showing one step in a method for manufacturing a machined product 203 according to a non-limiting embodiment of the present disclosure. In the example shown in Figs. 14 to 16, a cutting tool 101 including a holder 1 is used, but the present invention is not limited to this embodiment. For example, a cutting tool 101 including a holder 1 according to another embodiment may be used.

[0065] A method for manufacturing the machined product 203 according to a non-limiting embodiment may include the following steps (1) to (4).

[0066] (1) As a non-limiting example shown in FIG. 14, a workpiece 201 and a cutting tool 101 are prepared; (2) Rotating the workpiece 201; (3) As a non-limiting example shown in FIG. 15, a workpiece 201 and a cutting tool 101 are brought into contact with each other; (4) As a non-limiting example shown in FIG. 16, the workpiece 201 and the cutting tool 101 are separated from each other.

[0067] Specifically, examples of the material of the workpiece 201 prepared in step (1) include carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metal, etc. In a non-limiting example shown in Fig. 14, the above-mentioned cutting tool 101 may be prepared in step (1).

[0068] In step (2), as a non-limiting example shown in FIG. 14, the workpiece 201 may be rotated about its rotation axis O2.

[0069] 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 workpiece 201. Next, as in a non-limiting example shown in Fig. 15, the cutting tool 101 may be brought into contact with the rotating workpiece 201. In the non-limiting example shown in Fig. 15, the cutting edge 105 of the cutting tool 101 may be brought into contact with the workpiece 201 to cut the workpiece 201.

[0070] In step (4), as a non-limiting example shown in FIG. 16, the cutting tool 101 may be moved in the direction of arrow Y2 to separate the cutting tool 101 from the workpiece 201, thereby obtaining a machined product 203.

[0071] According to the manufacturing method of the machined product 203 of the non-limiting embodiment, the cutting tool 101 having the holder 1 with high vibration-proofing performance is used, so that the workpiece 201 can be cut with excellent machining accuracy while reducing the risk of chatter vibration. As a result, the machined product 203 having a highly accurate machined surface can be obtained.

[0072] In step (3), the workpiece 201 may be brought closer to the cutting tool 101. In step (4), the workpiece 201 may be moved away from the cutting tool 101. When continuing the cutting process, the workpiece 201 may be kept rotating and the step of bringing the cutting blade 105 into contact with different positions of the workpiece 201 may be repeated.

[0073] The above provides examples of non-limiting embodiments of the holder 1, cutting tool 101, and manufacturing method for machined product 203. However, this aspect is not limited to the above-mentioned embodiments, and it goes without saying that any embodiment can be used as long as it does not deviate from the gist of this aspect.

[0074] For example, the components of the holder 1 may be combined with each other to form holders 1 of other embodiments.

[0075] In addition, in the above non-limiting embodiment, the cutting tool 101 is a turning tool, but instead, the cutting tool 101 can be, for example, a milling tool. When the cutting tool 101 is a milling tool, the cutting tool 101 is rotated in step (2) in the manufacturing method of the machined product 203.

[0076] 〔summary〕 The holder according to aspect 1 of the present disclosure has a body having a shape extending from a first end to a second end along a central axis, a pocket located on the side of the first end into which a cutting insert can be attached, and a cavity located closer to the second end than the pocket and extending along the central axis, a weight located inside the cavity, extending along the central axis, and having a plurality of divided weight members divided circumferentially around the central axis, an annular retaining member into which the weight is inserted and abutting against the outer surface of the weight, and an annular elastic member into which the weight is inserted and abutting against the outer surface of the weight and the inner surface of the cavity.

[0077] A holder according to a second aspect of the present disclosure is similar to the first aspect, in that the holding member is spaced apart from the inner circumferential surface of the cavity.

[0078] In the holder of aspect 3 of the present disclosure, in aspect 2, in a cross section cut along the central axis, the width of the elastic member in a direction perpendicular to the central axis is greater than the width of the retaining member in a direction perpendicular to the central axis.

[0079] A holder according to a fourth aspect of the present disclosure is in any one of the first to third aspects, wherein the width of the elastic member in the direction along the central axis is greater than the width of the holding member in the direction along the central axis.

[0080] A holder according to aspect 5 of the present disclosure is any one of aspects 1 to 4, and includes a plurality of the retaining members, the plurality of retaining members having a first retaining member located on the first end side of the weight and a second retaining member located on the second end side of the weight, and includes a plurality of the elastic members, the plurality of elastic members having a first elastic member located on the first end side of the weight and a second elastic member located on the second end side of the weight.

[0081] A holder according to aspect 6 of the present disclosure is similar to aspect 5, except that the first elastic member is positioned closer to the first end than the first retaining member, and the second elastic member is positioned closer to the second end than the second retaining member.

[0082] A holder according to a seventh aspect of the present disclosure is any one of the first to sixth aspects, wherein in a cross section taken along the central axis, the holding member is rectangular and the elastic member is circular.

[0083] The holder according to an eighth aspect of the present disclosure is the holder of any one of the first to seventh aspects, wherein the holding member is made of metal and the elastic member is made of rubber.

[0084] A cutting tool according to a ninth aspect of the present disclosure includes the holder of any one of the first to eighth aspects and a cutting insert positioned in the pocket of the holder.

[0085] A method for manufacturing a machined product according to aspect 10 of the present disclosure includes the steps of rotating a workpiece, contacting the rotating workpiece with the cutting tool of aspect 9, and removing the cutting tool from the workpiece. [Explanation of symbols]

[0086] 1 Holder 3. Main unit 3a...1st end (tip) 3b...2nd end (rear end) 5... weight 7. Holding member 9. Elastic member 11. Pocket 13...Cavity 15...Divided weight member 17...First holding member 19...Second holding member 21... First elastic member 23... Second elastic member 25...tube 25a Flow path 27...Inlet 51... Vibration-proof member 101...Cutting tools 103···Cutting insert (insert) 105···Cutting edge 107...Through hole 109... Fixing member (screw) 201...Work material 203...Cutting workpiece O1...center axis O2 Rotating shaft

Claims

1. A shape extending from a first end to a second end along a central axis, A pocket located on the first end side to which a cutting insert can be attached; a body having a cavity located closer to the second end than the pocket and extending along the central axis; a recess located within the cavity and extending along the central axis; a weight having a plurality of divided weight members divided in a circumferential direction around the central axis; an annular holding member into which the weight is inserted and which is in contact with an outer surface of the weight; a holder having an annular elastic member into which the weight is inserted and which is in contact with an outer surface of the weight and an inner peripheral surface of the cavity.

2. The holder of claim 1 , wherein the retaining member is spaced from the inner periphery of the cavity.

3. 3. The holder according to claim 2, wherein in a cross section taken along the central axis, a width of the elastic member in a direction perpendicular to the central axis is greater than a width of the holding member in the direction perpendicular to the central axis.

4. The holder of claim 1 , wherein a width of the elastic member in a direction along the central axis is greater than a width of the retaining member in a direction along the central axis.

5. A plurality of the holding members are provided, The plurality of holding members include A first holding member located on the side of the first end of the weight; a second holding member located on the second end side of the weight, A plurality of the elastic members are provided, The plurality of elastic members include a first elastic member located on the side of the first end of the weight; The holder according to claim 1 , further comprising: a second elastic member located on a side of the second end of the weight.

6. the first elastic member is located closer to the first end than the first holding member, The holder according to claim 5 , wherein the second elastic member is located closer to the second end than the second holding member.

7. 2. The holder according to claim 1, wherein, in a cross section taken along the central axis, the holding member is rectangular and the elastic member is circular.

8. 2. The holder according to claim 1, wherein the holding member is made of metal, and the elastic member is made of rubber.

9. A holder according to any one of claims 1 to 8; a cutting insert located in the pocket in the holder.

10. Rotating the workpiece; contacting the rotating workpiece with the cutting tool according to claim 9; removing the cutting tool from the workpiece; A method for manufacturing a machined product comprising the steps of:

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