Tool assembly and method for manufacturing machined product

Abstract

A tool assembly according to one non-limiting aspect of the present disclosure includes: a holder that has a shape extending along a first central axis and having a first hole extending along the first central axis; a sleeve that has a cylindrical shape extending along a second central axis parallel to the first central axis, has a second hole extending along the second central axis, and is inserted into the first hole; and a cutting tool that has a columnar shape extending along a third central axis parallel to the second central axis, has a third hole extending along the third central axis, and is inserted into the second hole. The second hole has a bottom surface that is positioned on the rear end side in a direction along the second central axis and that is in contact with the cutting tool, and a through-hole that penetrates the bottom surface in a direction along the second central axis. The second hole is eccentric with respect to the second central axis.

Description

Tool assembly and manufacturing method for machined products CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Japanese Patent Application No. 2023-199559, filed on November 27, 2023, the entire disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to a tool assembly and a method for manufacturing a machined product. The tool assembly can be used when cutting a workpiece such as a metal.

[0003] A cutting tool mounting device described in Japanese Utility Model Laid-Open Publication No. 62-032703 (Patent Document 1) is known as a tool assemble used when cutting workpieces such as metal members. In the tool assemble (cutting tool mounting device) described in Patent Document 1, a cutting tool is inserted into a tool holder via an eccentric sleeve. By rotating the eccentric sleeve, it is possible to adjust the diameter of the cutting edge position of the cutting tool.

[0004] The cutting tool has a flange, and the cutting tool can be positioned in the axial direction by abutting the flange against the eccentric sleeve. In addition, since the flange of the cutting tool abuts against the eccentric sleeve, the rear end face of the cutting tool is spaced apart from the eccentric sleeve.

[0005] Generally, a cutting tool is provided with a hole that can be used to cool the cutting tool during cutting. Coolant is supplied to this hole from the rear end face of the cutting tool and flows out from the front end side of the cutting tool to the outside. In the tool assembly described in Patent Document 1, the rear end face of the cutting tool is separated from the eccentric sleeve as described above. Therefore, coolant is likely to leak between the cutting tool and the eccentric sleeve, which could result in an insufficient supply of coolant to the hole in the cutting tool.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a tool assembly that makes it easy to supply coolant to a hole in a cutting tool and that allows the diameter of the cutting edge position to be adjusted.

[0007] A non-limiting one-sided tool assembly of the present disclosure includes a holder having a shape extending along a first central axis and a first hole extending along the first central axis, a sleeve having a cylindrical shape extending along a second central axis parallel to the first central axis and a second hole extending along the second central axis, and inserted into the first hole, and a cutting tool having a cylindrical shape extending along a third central axis parallel to the second central axis and a third hole extending along the third central axis, and inserted into the second hole.

[0008] The second hole has a bottom surface that is located on the rear end side in a direction along the second central axis and against which the cutting tool abuts, and a through hole that penetrates the bottom surface in a direction along the second central axis. The second hole is eccentric with respect to the second central axis.

[0009] 1 is a perspective view showing one non-limiting tool assembly of the present disclosure; FIG. 1 is a perspective view of the tool assembly shown in FIG. 1 from another direction; FIG. 1 is a plan view of the tool assembly shown in FIG. 1 as viewed from the tip side; FIG. 1 is a plan view of the tool assembly shown in FIG. 1 as viewed from the tip side; FIG. 3 is a side view of the tool assembly shown in FIG. 3 as viewed from direction V; FIG. 3 is a side view of the tool assembly shown in FIG. 3 as viewed from direction VI; FIG. 5 is a cross-sectional view of section VII of the tool assembly shown in FIG. 5; FIG. 7 is an enlarged view of region VIII shown in FIG. 7; FIG. 16 is a plan view of the tool assembly shown in FIG. 1 as viewed from the rear end side; FIG. 17 is a perspective view of a holder in the tool assembly shown in FIG. 1; FIG. 18 is a plan view of the holder shown in FIG. 19; FIG. 19 is a side view of the holder shown in FIG. 20; FIG. 21 is a side view of the holder shown in FIG. 21; FIG. 22 is a plan view of the holder shown in FIG. 22 from direction XII; FIG. 23 is a side view of the holder shown in FIG. 23; FIG. 24 is a plan view of the holder shown in FIG. 24 from direction XIII; FIG. 25 is a perspective view of a sleeve in the tool assembly shown in FIG. 1; FIG. 26 is a plan view of the sleeve shown in FIG. 25 as viewed from the tip side; FIG. 27 is a side view of the sleeve shown in FIG. 26 as viewed from direction XVII. 20. A side view of the sleeve shown in FIG. 16 as seen from direction XVIII. A plan view of the sleeve shown in FIG. 15 as seen from the rear end side. A side view of a sleeve in a non-limiting one-sided tool assembly of the present disclosure, a view corresponding to FIG. 17. A cross-sectional view of a non-limiting one-sided tool assembly of the present disclosure, a view corresponding to FIG. 8. A plan view of a holder in a non-limiting one-sided tool assembly of the present disclosure, a view corresponding to FIG. 11. A side view of a sleeve in a non-limiting one-sided tool assembly of the present disclosure, a view corresponding to FIGS. 17 and 20. A cross-sectional view of the XXIV cross section of the sleeve shown in FIG. 23. A schematic view showing one step in a non-limiting method for manufacturing a machined product with one surface of the present disclosure. A schematic view showing one step in a non-limiting method for manufacturing a machined product with one surface of the present disclosure. A schematic view showing one step in a non-limiting method for manufacturing a machined product with one surface of the present disclosure.

[0010] <Tool Assembly> A non-limiting example of a tool assembly 1 (hereinafter simply referred to as "assembly 1") according to the present disclosure will be described in detail below with reference to the drawings. However, for the sake of convenience, the drawings below show only the main components necessary for explaining the embodiment in a simplified form. Therefore, the assembly 1 may include any components not shown in the drawings. Furthermore, the dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components or the dimensional ratios of the components.

[0011] The assembly 1 may include a holder 3, a sleeve 5 and a cutting tool 7, as shown in one non-limiting example in FIGS.

[0012] The holder 3 can function as a member that holds the cutting tool 7 via the sleeve 5. The holder 3 may have a shape that extends along the first central axis O1, as in a non-limiting example shown in FIGS.

[0013] The holder 3 may have a first hole 9. The first hole 9 may extend along the first central axis O1. The first hole 9 may open on the tip side of the holder 3 in the direction along the first central axis O1.

[0014] In addition, in the direction along the first central axis O1, the side closer to the cutting edge of the cutting tool 7 may be referred to as the "front end side," and the side away from the cutting edge may be referred to as the "rear end side." This also applies to the cases along other central axes described later.

[0015] 12 and 13, the holder 3 may have a rod-shaped shank portion 11 located on the rear end side. The shank portion 11 can function as a portion attached to a machine tool. Note that the first center axis O1 may be a configuration in which the center of the outer diameter of the shank portion 11 is continuous along the extension direction of the shank portion 11.

[0016] The sleeve 5 can function as a member for adjusting the diameter of the cutting edge position of the cutting tool 7. The sleeve 5 may have a cylindrical shape extending along the second central axis O3, as in the non-limiting example shown in Figures 15 to 19. The cylindrical shape may be a roughly cylindrical shape, and does not have to be a cylindrical shape in the strict sense.

[0017] The second central axis O3 may be parallel to the first central axis O1. Parallel does not necessarily mean strictly parallel, but may mean allowing an inclination of about ±2°. The second central axis O3 may be a continuous axis extending from the center of the outer diameter of the sleeve 5 along the extension direction of the sleeve 5.

[0018] The sleeve 5 may have a second hole 13. The second hole 13 may extend along a second central axis O3. The second hole 13 may open on a tip side of the sleeve 5 in a direction along the second central axis O3.

[0019] The sleeve 5 may be inserted into the first hole 9, as a non-limiting example shown in Figures 7 and 8. The sleeve 5 may be inserted into the first hole 9 so as to be rotatable about the second central axis O3.

[0020] The cutting tool 7 can function as a member that cuts a workpiece in a cutting process. The cutting tool 7 may have a cylindrical shape extending along a third central axis O5, as shown in a non-limiting example in FIGS. 1 and 6 . The cylindrical shape may be roughly cylindrical, and does not necessarily have to be cylindrical in the strict sense. Furthermore, the third central axis O5 may be parallel to the second central axis O3.

[0021] The cutting tool 7 may have a third hole 15, as shown in a non-limiting example in Fig. 7 . The third hole 15 may extend along a third central axis O5. The third hole 15 may open at both the front end and the rear end of the cutting tool 7 in the direction along the third central axis O5. A coolant can be flowed through the inside of the third hole 15.

[0022] The cutting tool 7 may be inserted into the second hole 13. The cutting tool 7 may have a cutting edge 17 on the tip side in the direction along the third central axis O5, as in a non-limiting example shown in FIG. 1 . The cutting edge 17 can be used to cut a workpiece when manufacturing a machined product using the assembly 1. The cutting tool 7 may be inserted into the second hole 13 so that the cutting edge 17 protrudes outward from the second hole 13.

[0023] Here, the second hole 13 may have a bottom surface 19 and a through-hole 21, as shown in a non-limiting example in FIG.

[0024] The bottom surface 19 may be located on the rear end side of the second hole 13 in the direction along the second central axis O3. The bottom surface 19 may be a portion that comes into contact with the cutting tool 7, as in the non-limiting example shown in Figures 7 and 8. The bottom surface 19 may be a portion that comes into contact with a rear end face 23 that is located on the rear end side of the cutting tool 7 in the direction along the third central axis O5.

[0025] The through hole 21 may be a portion that penetrates the bottom surface 19 in a direction along the second central axis O3, as in a non-limiting example shown in Fig. 15. A coolant can be flowed through the inside of the through hole 21. The through hole 21 may be connected to the third hole 15, as in a non-limiting example shown in Figs. 7 and 8.

[0026] The second hole 13 may be eccentric with respect to the second central axis O3, as in a non-limiting example shown in Fig. 17. In other words, the central axis O7 of the second hole 13 may be misaligned with the second central axis O3.

[0027] The thickness W of the sleeve 5 does not have to be constant in the circumferential direction of the second center axis O3. The sleeve 5 may not be a simple sleeve, but may be a so-called eccentric sleeve. The thickness W of the sleeve 5 is not limited to a specific size. The thickness W may be set to, for example, about 1 to 6 mm.

[0028] When second hole 13 has bottom surface 19 and through hole 21, coolant is easily supplied to third hole 15, which is a hole in cutting tool 7. In addition, when second hole 13 has bottom surface 19 and through hole 21, rear end surface 23 of cutting tool 7 abuts against bottom surface 19, making it difficult for coolant to leak between cutting tool 7 and sleeve 5. Therefore, coolant is easily supplied to third hole 15 of cutting tool 7 through through hole 21.

[0029] Furthermore, when the second hole 13 is eccentric with respect to the second central axis O3, rotating the sleeve 5 around the second central axis O3 allows for diameter adjustment of the cutting edge position of the cutting tool 7. Specifically, as shown in a non-limiting example in Figure 3, rotating the sleeve 5 in the direction of arrow Y1 or arrow Y2 allows for diameter adjustment of the cutting edge position (position of the cutting edge 17) in the direction of arrow Y3 or arrow Y4.

[0030] The inner diameter D21 of the through hole 21 may be the same as or different from the inner diameter D15 of the third hole 15. For example, the inner diameter D21 of the through hole 21 may be larger than the inner diameter D15 of the third hole 15, as in a non-limiting example shown in FIG. 8 . In this case, the coolant can be smoothly supplied to the third hole 15.

[0031] Conversely, the inner diameter D21 of the through hole 21 may be smaller than the inner diameter D15 of the third hole 15. In this case, the area of ​​the rear end face 23 of the cutting tool 7 is likely to be large, making it difficult for coolant to leak between the cutting tool 7 and the sleeve 5.

[0032] The inner diameter D21 of the through hole 21 and the inner diameter D15 of the third hole 15 are not limited to specific values. For example, the inner diameter D21 of the through hole 21 may be set to 3 to 16 mm. The inner diameter D15 of the third hole 15 may be set to 5 to 9 mm.

[0033] 7 , the through hole 21 may extend along the third central axis O5. In this case, when the diameter of the cutting edge position of the cutting tool 7 is adjusted by rotating the sleeve 5 around the second central axis O3, the position of the through hole 21 with respect to the third central axis O5 is unlikely to change. Therefore, coolant can be stably supplied to the third hole 15.

[0034] The first hole 9 may be eccentric with respect to the first central axis O1, as shown in a non-limiting example in Fig. 8. In other words, the central axis O9 of the first hole 9 may be misaligned with respect to the first central axis O1. In this case, when the holder 3 is rotated around the first central axis O1, the diameter of the cutting edge position of the cutting tool 7 can be adjusted in accordance with this rotation.

[0035] As shown in a non-limiting example in Figure 8, when the first hole 9 is eccentric with respect to the first central axis O1 and the second hole 13 is eccentric with respect to the second central axis O3, the degree of freedom in the direction of movement of the cutting edge position (position of the cutting edge 17) is increased.

[0036] When only the holder 3 is rotated around the first central axis O1, or when only the sleeve 5 is rotated around the second central axis O3, the cutting edge position moves in both the directions of arrows Y3 and Y4. On the other hand, when the sleeve 5 is rotated around the second central axis O3 while the holder 3 is rotated around the first central axis O1, for example, the movement of the cutting edge position in one of the directions of arrows Y3 and Y4 can be offset, and the cutting edge position can be moved in only one of the directions of arrows Y3 and Y4.

[0037] The eccentricity δ9 of the first hole 9 relative to the first central axis O1 may be greater than the eccentricity δ13 of the second hole 13 relative to the second central axis O3. In this case, fine diameter adjustment of the cutting edge position (position of the cutting edge 17) becomes possible. Because the amount of diameter adjustment of the cutting edge position by the first hole 9 and the amount of diameter adjustment of the cutting edge position by the second hole 13 are different from each other, it is possible to use either of them differently, for example, by rotating the holder 3 for large diameter adjustments and by rotating the sleeve 5 for fine adjustments.

[0038] 4, the range of motion R5 of the sleeve 5 in the circumferential direction of the second central axis O3 may be larger than the range of motion R3 of the holder 3 in the circumferential direction of the first central axis O1. In this case, even when the space for installing the assembly 1 is narrow, such as in an automatic lathe, a wide range of diameter adjustment can be easily ensured.

[0039] The sleeve 5 may have a first flange portion 25, as shown in a non-limiting example in Fig. 15. The first flange portion 25 may be located on the tip side of the sleeve 5 in the direction along the second central axis O3. The outer diameter of the first flange portion 25 may be larger than the inner diameter of the first hole 9 (see Fig. 7).

[0040] 15 and other non-limiting examples, the outer peripheral surface 27 of the first flange portion 25 has a recess 29. In this manner, the outer peripheral surface 27 of the first flange portion 25 may have a recess 29 and / or a protrusion. In this case, when rotating the sleeve 5 around the second central axis O3, it is easy to adjust the amount of rotation of the sleeve 5 using the recess 29 and / or the protrusion as a guide. Furthermore, the recess 29 and / or the protrusion can easily be caught by the operator's fingers, making it easy to rotate the sleeve 5.

[0041] In a non-limiting example shown in FIG. 15 , the outer peripheral surface 27 of the first flange portion 25 has a plurality of recesses 29 aligned in the circumferential direction of the second center axis O3. In this manner, the outer peripheral surface 27 of the first flange portion 25 may have a plurality of recesses 29 and / or protrusions aligned in the circumferential direction of the second center axis O3. In this case, when rotating the sleeve 5 around the second center axis O3, the recesses 29 and / or protrusions serve as markers to easily determine the amount of rotation of the sleeve 5. This facilitates fine diameter adjustment of the cutting edge position (position of the cutting edge 17). Furthermore, the recesses 29 and / or protrusions are more likely to catch on the operator's fingers, facilitating further rotation of the sleeve 5.

[0042] 8 , the holder 3 may further have a fourth hole 31 connected to the first hole 9 on the rear end side of the first hole 9 in the direction along the first central axis O1. A coolant can be flowed through the inside of the fourth hole 31.

[0043] The fourth hole 31 may have an opening 33 that opens at the outer periphery of the holder 3. The opening 33 can function as an inlet for allowing coolant to flow into the inside of the fourth hole 31. The position of the opening 33 is not particularly limited.

[0044] When the holder 3 has the fourth hole 31, it becomes possible for the coolant supplied from the outside to flow through the fourth hole 31, through the through hole 21 and then through the third hole 15 in this order.

[0045] Examples of coolants include water-insoluble oils and water-soluble oils. Examples of water-insoluble oils include cutting oils such as oil-based, inactive extreme pressure, and active extreme pressure types. 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. The coolant may be selected appropriately depending on the material of the workpiece.

[0046] As shown in a non-limiting example in FIG. 10 , the holder 3 may further include a fifth hole 35 that penetrates the outer periphery toward the first central axis O1 and opens at the first hole 9. The fifth hole 35 may be a screw hole. Furthermore, as shown in a non-limiting example in FIG. 15 , the sleeve 5 may further include a sixth hole 37 that penetrates the outer periphery toward the second central axis O3 and extends along the circumferential direction of the second central axis O3. As shown in a non-limiting example in FIG. 8 , the assembly 1 may further include a screw 39. The screw 39 may be inserted into the fifth hole 35 and the sixth hole 37.

[0047] In these cases, the screws 39 inserted into the fifth hole 35 and the sixth hole 37 can be brought into contact with the cutting tool 7, thereby fixing the cutting tool 7 to the holder 3. If the sixth hole 37 extends in the circumferential direction of the second central axis O3, the sleeve 5 can be rotated around the second central axis O3 with the screws 39 inserted into the fifth hole 35 and the sixth hole 37.

[0048] The holder 3 may have a plurality of fifth holes 35. The plurality of fifth holes 35 may be positioned in a row along the first central axis O1, as in a non-limiting example shown in FIG. 10 . When there are a plurality of fifth holes 35, the number of the fifth holes 35 may be two to four. The assembly 1 may also have a plurality of screws 39. The number of the screws 39 may be the same as the number of the fifth holes 35. Note that the sleeve 5 may also have a plurality of sixth holes 37 (see FIG. 23 ). The plurality of sixth holes 37 may be positioned in a row along the second central axis O3. The number of the sixth holes 37 may be the same as the number of the fifth holes 35.

[0049] The cutting tool 7 may have a cylindrical holder 41 and a cylindrical cutting insert 43 (hereinafter simply referred to as "insert 43") attached to the holder 41, as shown in a non-limiting example in Figures 5 and 7.

[0050] The holder 41 may have a third hole 15. The insert 43 may have a cutting edge 17. The insert 43 may be inserted into the third hole 15 such that the cutting edge 17 protrudes outward from the tip side of the holder 41 in the direction along the third central axis O5.

[0051] The insert 43 is not limited to a specific size. For example, the length of the insert 43 in the direction along the third central axis O5 may be set to approximately 20 to 90 mm. The outer diameter of the insert 43 may be set to approximately 2 to 8 mm.

[0052] The insert 43 may be attached to the holder 41 by a fixing member 45. In other words, the cutting tool 7 may further include a fixing member 45 that fixes the insert 43 to the holder 41. There may be only one fixing member 45, or there may be multiple fixing members 45. The fixing member 45 may be, for example, a screw.

[0053] The cutting tool 7 is not limited to a configuration including a holder 41 and an insert 43. The cutting tool 7 may be a so-called solid tool. In the non-limiting example shown in FIG. 1, the cutting tool 7 is used for so-called turning. Examples of turning include internal diameter machining, external diameter machining, and grooving. The cutting tool 7 is not limited to a tool for turning. There is no problem if the cutting tool 7 is used for milling.

[0054] The retainer 3 may be made of, for example, steel. The sleeve 5 may be made of, for example, steel. The holder 41 may be made of, for example, steel and cast iron. The insert 43 may be made of, for example, cemented carbide and cermet.

[0055] 10 to 14, the holder 3 may further have a second flange portion 49 located further forward than the shank portion 11. When the holder 3 has the second flange portion 49, it is possible to easily position the assembly 1 relative to the machine tool in the direction along the first central axis O1.

[0056] The second flange portion 49 may be provided with a threaded hole 51 that penetrates in a direction along the first central axis O1. The assembly 1 may be fixed to a machine tool by inserting a screw into the threaded hole 51 and fixing the screw to the machine tool.

[0057] Next, a non-limiting alternative embodiment of tool assembly 1A (hereinafter simply referred to as "assembly 1A") of the present disclosure will be described with reference to the drawings. The following mainly describes the differences between assembly 1A and assembly 1, and detailed descriptions of the same configuration as assembly 1 may be omitted. Therefore, the description of assembly 1 may be used to understand the configuration of assembly 1A. This also applies to tool assembly 1B, tool assembly 1C, and tool assembly 1D, which will be described later.

[0058] 20 shows a non-limiting example in which the eccentricity δ13 of the second hole 13 relative to the second central axis O3 in the assembly 1A may be greater than the eccentricity δ13 of the second hole 13 in the assembly 1 described above (see FIG. 17). In this case, when adjusting the diameter of the cutting edge position, the cutting edge can be moved more than in the assembly 1 described above.

[0059] Next, a non-limiting yet another aspect of a tool assembly 1B (hereinafter also simply referred to as "assembly 1B") of the present disclosure will be described with reference to the drawings.

[0060] 21 shows a non-limiting example, in the assembly 1B, the bottom surface 19 of the second hole 13 may have an O-shaped (annular) elastic member 47. In this case, the rear end surface 23 of the cutting tool 7 abuts against the elastic member 47 on the bottom surface 19, making it even more difficult for coolant to leak between the cutting tool 7 and the sleeve 5. The elastic member 47 may be made of, for example, rubber.

[0061] The inner diameter of the elastic member 47 may be the same as or different from the inner diameter D15 of the third hole 15. The inner diameter of the elastic member 47 may be the same as or different from the inner diameter D21 of the through hole 21. For example, the inner diameter of the elastic member 47 may be larger than the inner diameter D15 of the third hole 15 and the inner diameter D21 of the through hole 21, as in a non-limiting example shown in FIG.

[0062] Next, a non-limiting yet another aspect of a tool assembly 1C (hereinafter also simply referred to as "assembly 1C") of the present disclosure will be described with reference to the drawings.

[0063] The screw holes 51 in the assembly 1C may have a flat shape extending in the circumferential direction of the first central axis O1, as in the non-limiting example shown in Figure 22. When the screw holes 51 have such a configuration, the assembly 1C can be fixed to a machine tool by screws while ensuring a wide range of rotation of the holder 3 around the first central axis O1.

[0064] Next, a non-limiting yet another aspect of a tool assembly 1D (hereinafter also simply referred to as "assembly 1D") of the present disclosure will be described with reference to the drawings.

[0065] In assembly 1D, as in a non-limiting example shown in Figures 23 and 24, the bottom surface 19 of the second hole 13 of the sleeve 5 may have an annular protrusion 53 that protrudes toward the tip side. In this case, the protrusion 53 may be the portion that comes into contact with the cutting tool 7. When manufacturing the sleeve 5, it is easier to make the top surface 53a of the protrusion 53 flat compared to when the bottom surface 19 has a simple, approximately flat configuration. When the bottom surface 19 has the protrusion 53, a gap is less likely to occur between the top surface 53a of the protrusion 53 and the rear end surface 23 of the cutting tool 7, and therefore coolant is less likely to leak between the cutting tool 7 and the sleeve 5.

[0066] <Method for Manufacturing Machined Product> Next, a non-limiting method for manufacturing the machined product 101 on one surface according to the present disclosure will be described with reference to the drawings, taking as an example a case where the above-described assembly 1 is used.

[0067] The machined product 101 may be produced by cutting a workpiece 103. A manufacturing method for the machined product 101 may include the following steps: (1) a step of rotating the workpiece 103; (2) a step of bringing the cutting tool 7 in the assembly 1 typified by the non-limiting embodiment described above into contact with the rotating workpiece 103; and (3) a step of separating the assembly 1 from the workpiece 103.

[0068] Specifically, first, as shown in a non-limiting example in Fig. 25 , the workpiece 103 may be rotated around the axis O11, and the assembly 1 attached to the machine tool 201 may be brought relatively close to the workpiece 103. Next, as shown in a non-limiting example in Fig. 26 , the cutting edge 17 of the cutting tool 7 may be brought into contact with the workpiece 103 to cut the workpiece 103. Then, as shown in a non-limiting example in Fig. 27 , the assembly 1 may be moved relatively away from the workpiece 103.

[0069] By going through the above steps, it is possible to obtain a machined product 101 with a highly accurate finished surface. Specifically, in the manufacturing method of the machined product 101, when the assembly 1 is used, coolant is easily supplied to the third hole 15 of the cutting tool 7, and the diameter of the cutting edge position can be adjusted, thereby enabling excellent machinability to be exhibited. As a result, it is possible to obtain a machined product 101 with a highly accurate finished surface.

[0070] In the non-limiting example shown in FIGS. 25 to 27, the workpiece 103 is fixed and the assembler 1 is moved in each step, but the present invention is not limited to this configuration.

[0071] For example, in step (1), the workpiece 103 may be brought closer to the assembly 1. In step (3), the workpiece 103 may be moved away from the assembly 1. When continuing the cutting process, the workpiece 103 may be kept rotating, and the step of bringing the cutting tool 7 into contact with different locations on the workpiece 103 may be repeated.

[0072] Examples of the material of the workpiece 103 include titanium alloys, aluminum, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0073] 25 to 27, Assemble 1 is used, but the present invention is not limited to this. For example, Assemble 1A, Assemble 1B, Assemble 1C, or Assemble 1D may be used instead of Assemble 1.

[0074] The above describes an example of one aspect of the present disclosure regarding the tool assemblies 1, 1A, 1B, 1C, and 1D and the manufacturing method of the machined product 101, but it goes without saying that the present disclosure is not limited to the above-described embodiments and may be any as long as it does not deviate from the gist of the present disclosure.

[0075] For example, the tool assemblies 1, 1A, 1B, 1C, and 1D and the manufacturing method of the machined product 101 may be configured as follows: [1] The tool assemble includes: a holder having a shape extending along a first central axis and having a first hole extending along the first central axis; a sleeve having a cylindrical shape extending along a second central axis parallel to the first central axis and having a second hole extending along the second central axis, the sleeve being inserted into the first hole; and a cutting tool having a cylindrical shape extending along a third central axis parallel to the second central axis and having a third hole extending along the third central axis, the cutting tool being inserted into the second hole, the second hole having a bottom surface located on a rear end side in a direction along the second central axis and against which the cutting tool abuts, and a through hole penetrating the bottom surface in a direction along the second central axis, the second hole being eccentric with respect to the second central axis. [2] In the tool assembly of [1] above, the inner diameter of the through hole may be larger than the inner diameter of the third hole. [3] In the tool assembly of [1] or [2] above, the through hole may extend along the third central axis. [4] In any one of the tool assemblies of [1] to [3] above, the first hole may be eccentric with respect to the first central axis. [5] In the tool assembly of [4] above, the eccentricity of the first hole with respect to the first central axis may be larger than the eccentricity of the second hole with respect to the second central axis. [6] In the tool assemble of [5] above, the range of motion of the sleeve in the circumferential direction of the second central axis may be larger than the range of motion of the holder in the circumferential direction of the first central axis. [7] In any one of the tool assemblies of [1] to [6] above, the sleeve may have a first flange portion located on the tip side in the direction along the second central axis, and the outer circumferential surface of the first flange portion may have a recess and / or a protrusion. [8] In the tool assembly of [7] above, the outer peripheral surface of the first flange portion may have a plurality of the recesses and / or the protrusions positioned side by side in the circumferential direction of the second central axis. [9] A method for manufacturing a machined product may include a step of rotating a workpiece, a step of bringing a cutting tool in any one of the tool assemblies of [1] to [8] above into contact with the rotating workpiece, and a step of separating the tool assembly from the workpiece.

[0076] DESCRIPTION OF SYMBOLS 1...Tool assembly (assemble) 1A...Tool assembly (assemble) 1B...Tool assembly (assemble) 1C...Tool assembly (assemble) 1D...Tool assembly (assemble) 3...Holder 5...Sleeve 7...Cutting tool 9...First hole 11...Shank portion 13...Second hole 15...Third hole 17...Cutting edge 19...Bottom surface 21...Through hole 23...Rear end surface 25...First flange portion 27...Outer peripheral surface 29...Recess 31...Fourth hole 33...Opening 35...Fifth hole 37...Sixth hole 39...Screw 41...Holder 43...Cutting insert (insert) 45...Fixing member 47...Elastic member 49...Second flange portion 51...Threaded hole 53...Protrusion 53a...Top surface 101... Cutting workpiece 103... Workpiece 201... Machine tool O1... First central axis O3... Second central axis O5... Third central axis O7... Central axis of second hole O9... Central axis of first hole O11... Axis

Claims

1. A tool assembly comprising: a holder having a shape extending along a first central axis and having a first hole extending along the first central axis; a sleeve having a cylindrical shape extending along a second central axis parallel to the first central axis and having a second hole extending along the second central axis, the sleeve being inserted into the first hole; and a cutting tool having a cylindrical shape extending along a third central axis parallel to the second central axis and having a third hole extending along the third central axis, the cutting tool being inserted into the second hole, the second hole having: a bottom surface located at a rear end side in a direction along the second central axis with which the cutting tool abuts; and a through hole penetrating the bottom surface in a direction along the second central axis, the second hole being eccentric with respect to the second central axis.

2. The tool assembly of claim 1, wherein an inner diameter of said through hole is greater than an inner diameter of said third hole.

3. The tool assembly of claim 1 or 2, wherein the through hole extends along the third central axis.

4. A tool assembly as claimed in any one of claims 1 to 3, wherein said first hole is eccentric with respect to said first central axis.

5. The tool assembly of claim 4, wherein the eccentricity of said first hole relative to said first central axis is greater than the eccentricity of said second hole relative to said second central axis.

6. The tool assembly of claim 5, wherein the range of motion of said sleeve in the circumferential direction of said second central axis is greater than the range of motion of said retainer in the circumferential direction of said first central axis.

7. A tool assembly as described in any one of claims 1 to 6, wherein the sleeve has a flange portion located at the tip side in the direction along the second central axis, and the outer circumferential surface of the flange portion has a recess and / or a protrusion.

8. A tool assembly as described in claim 7, wherein the outer peripheral surface of the flange portion has a plurality of the recesses and / or protrusions positioned in a line in the circumferential direction of the second central axis.

9. A method for manufacturing a machined product, comprising the steps of: rotating a workpiece; bringing a cutting tool in a tool assembly described in any one of claims 1 to 8 into contact with the rotating workpiece; and removing the tool assembly from the workpiece.

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