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

Abstract

The tool holder of the unqualified aspect of the present disclosure has: a first end surface located at a first end; a first side surface extending from the first end surface toward a second end; a tool pocket opened with respect to the first end surface and the first side surface and capable of mounting a cutting insert; a main coolant hole extending from the first end side toward the second end side; a first sub-coolant hole connected with the main coolant hole; a second sub-coolant hole located closer to the second end than the first sub-coolant hole and connected with the main coolant hole. The first sub-coolant hole has a first opening opened at the first side surface. The second sub-coolant hole has a second opening opened at the first side surface. The width of the first opening in the direction of the central axis is smaller than the width of the second opening in the direction of the central axis.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to Japanese Patent Application No. 2020-177172, filed on October 22, 2020, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a tool holder, a cutting tool, and a method for manufacturing the workpiece, generally used in the cutting of a workpiece. More specifically, it relates to a cutting tool used in turning operations. Examples of turning operations include internal diameter machining, external diameter machining, grooving, parting, and facing. Background Technology

[0004] As a cutting tool used for machining workpieces such as metals, the cutting tool described in Japanese Patent Application Publication No. 2019-025603 (Patent Document 1) is known, for example. The cutting tool described in Patent Document 1 has a tool body (tool holder) in the shape of a quadrangular prism. The tool holder has an internal fluid flow path and a fluid supply port on its side, and is mounted on a tool table. The tool table has an opening for the flow path for fluid flow. The fluid supply port of the tool holder is connected to the opening of the tool table.

[0005] During machining of a workpiece, the amount of the cutting tool protruding from the tool holder is sometimes changed according to the machining conditions. It is required that fluid be stably supplied to the tool holder even when the protrusion amount changes. In other words, a high degree of freedom is required in setting the protrusion amount while simultaneously supplying fluid to the tool holder. Summary of the Invention

[0006] The tool holder of this disclosure, in one undefined aspect, is a rod-shaped structure extending along a central axis from a first end to a second end. The tool holder has: a first end face located at the first end; a first side face extending from the first end face toward the second end; a tool groove opening relative to the first end face and the first side face, and capable of mounting a cutting insert; a main coolant port extending from the first end side toward the second end side; a first secondary coolant port connected to the main coolant port; and a second secondary coolant port located closer to the second end than the first secondary coolant port and connected to the main coolant port.

[0007] The first auxiliary coolant hole has a first opening that opens onto the first side. The second auxiliary coolant hole has a second opening that opens onto the first side. The width of the first opening along the central axis is smaller than the width of the second opening along the central axis. Attached Figure Description

[0008] Figure 1 This is a perspective view showing a tool holder (cutting tool) of an undefined aspect of this disclosure.

[0009] Figure 2 Viewed from the first end side Figure 1 The top view of the tool holder shown.

[0010] Figure 3 Viewed from direction A1 (first side view) Figure 2 The top view of the tool holder shown.

[0011] Figure 4 It is a bird's-eye view. Figure 3 The diagram shows the tool holder.

[0012] Figure 5 Viewed from direction A2 (top surface) Figure 2 The top view of the tool holder shown.

[0013] Figure 6 It is a bird's-eye view. Figure 5 The diagram shows the tool holder.

[0014] Figure 7 Viewed from the A3 direction (second side view) Figure 2 The top view of the tool holder shown.

[0015] Figure 8 It is a bird's-eye view. Figure 7 The diagram shows the tool holder.

[0016] Figure 9 Is with Figure 3 The same side view of the tool holder shown.

[0017] Figure 10 yes Figure 9 The cross-sectional view of section XX in the tool holder shown.

[0018] Figure 11 yes Figure 9 A sectional view of the XI-XT section in the tool holder shown.

[0019] Figure 12 yes Figure 9 The cross-sectional view of section XII-XII in the tool holder shown.

[0020] Figure 13 This is a perspective view showing a tool holder (cutting tool) of an undefined aspect of this disclosure.

[0021] Figure 14 This is a cross-sectional view showing a tool holder (cutting tool) of an undefined aspect of this disclosure, and is equivalent to... Figure 10 The image.

[0022] Figure 15 This is a schematic diagram illustrating one step of a method for manufacturing a machined object according to an undefined aspect of this disclosure.

[0023] Figure 16 This is a schematic diagram illustrating one step of a method for manufacturing a machined object according to an undefined aspect of this disclosure.

[0024] Figure 17 This is a schematic diagram illustrating one step of a method for manufacturing a machined object according to an undefined aspect of this disclosure. Detailed Implementation

[0025] <Knife Holder>

[0026] Hereinafter, the tool holder 1, which is not limited to any aspect of this disclosure, will be described in detail using the accompanying drawings. However, in the figures referred to below, only the main components necessary for explaining the embodiments are shown in a simplified manner for ease of explanation. Therefore, the tool holder 1 of the cutting tool can include any constituent components not shown in the referenced 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. These points are also the same in the manufacturing methods of the cutting tool and the workpiece described later.

[0027] like Figures 1-12 As shown in the undefined example, the tool holder 1 can be a rod-shaped structure extending along the central axis O1 from the first end 1a to the second end 1b. Generally, the first end 1a is referred to as the "front end" and the second end 1b is referred to as the "rear end".

[0028] The tool holder 1 can also be, for example, a polygonal prism shape. Figure 1 As shown in the undefined example, the tool holder 1 can also be a quadrangular prism shape. It should be noted that the quadrangular prism shape does not have to be a strictly polygonal prism shape, and may also include some concave and convex shapes, as well as bends, etc.

[0029] The size of the tool holder 1 can be appropriately set according to the size of the workpiece being cut. For example, the length of the tool holder 1 along the direction of the central axis O1 can be set to 60 mm or more and 500 mm or less. Furthermore, the width (diameter) of the tool holder 1 in the direction orthogonal to the central axis O1 can be set to 6 mm or more and 250 mm or less. Examples of materials for the tool holder 1 include steel, cast iron, and aluminum alloy.

[0030] The tool holder 1 may have a tool shank 3 and a cutting head 5. The tool shank 3 can be held by a tool table in the machine tool. The cutting head 5 can be located on the first end 1a side relative to the tool shank 3. The cutting head 5 can hold the cutting insert.

[0031] The tool holder 1 may also have a first end face 7, a first side face 9, and a tool groove 11. The first end face 7 may be located at a first end 1a. The first side face 9 may extend from the first end face 7 toward a second end 1b. The tool groove 11 may be open relative to the first end face 7 and the first side face 9. The tool groove 11 is capable of mounting a cutting insert. The tool groove 11 may be located at the tool head 5.

[0032] The tool holder 1 may have a main coolant hole 13, a first auxiliary coolant hole 15, and a second auxiliary coolant hole 17. Each coolant hole allows fluid (cooling fluid) to flow. The fluid flowing through each coolant hole is generally referred to as "coolant". Examples of coolants include non-water-soluble oils and water-soluble oils. Examples of non-water-soluble oils include oily types, inactive extreme pressure types, and active extreme pressure types of cutting oils. Examples of water-soluble oils include emulsions, water-based oils, and solutions of cutting oils. The coolant is not limited to liquids and may also be a gas such as an inactive gas. The coolant may be appropriately selected and used depending on the material of the workpiece being cut.

[0033] Here, the main coolant hole 13 can extend from the first end 1a side toward the second end 1b side. The first auxiliary coolant hole 15 can be connected to the main coolant hole 13. The second auxiliary coolant hole 17 can be located closer to the second end 1b than the first auxiliary coolant hole 15, and can also be connected to the main coolant hole 13.

[0034] The first coolant hole 15 may have a first opening 19. The first opening 19 may open on a first side 9. The first opening 19 may open on the first side 9 of the tool holder 3. In addition, the second coolant hole 17 may have a second opening 21. The second opening 21 may open on the first side 9. The second opening 21 may open on the first side 9 of the tool holder 3.

[0035] The first opening 19 and the second opening 21 can be connected to the openings of the flow paths in the tool holder. Furthermore, the first opening 19 and the second opening 21 can also function as inlets for fluid to flow into the interior of the first auxiliary coolant hole 15 and the second auxiliary coolant hole 17. Therefore, when the first auxiliary coolant hole 15 has the first opening 19 and the second auxiliary coolant hole 17 has the second opening 21, fluid supplied from inside the tool holder can flow into the interior of the main coolant hole 13 via either the first opening 19 or the second opening 21. Additionally, the choice between using either the first opening 19 or the second opening 21 can be made depending on the machining conditions.

[0036] Unused openings in the first opening 19 and the second opening 21 can be blocked by sealing members to prevent fluid leakage. Examples of sealing members include solder, resin, and threaded components. The same applies to other openings.

[0037] The width W1 of the first opening 19 along the direction of the central axis O1 can be the same as, or different from, the width W2 of the second opening 21 along the direction of the central axis O1. For example, as Figure 3 As shown in the undefined example, the width W1 can be smaller than the width W2.

[0038] In other words, in the undefined example described above, the width W2 can be larger than the width W1. When the second opening 21 is used as a fluid inlet, even if the protrusion of the tool holder 1 changes by the width W2, fluid can still stably flow into the second opening 21. That is, the degree of freedom in the protrusion of the tool holder 1 is high.

[0039] Furthermore, assuming the second opening 21 serves as a fluid inlet, the first opening 19 can be located closer to the first end 1a than the tool holder. When the first opening 19 is connected to the second opening 21, i.e., there is only one opening, it is difficult to prevent fluid leakage from the second opening 21 when the protrusion of the first opening 19 is increased to the extent that it is located closer to the first end 1a than the tool holder. However, when the first opening 19 is located separately from the second opening 21, even if the protrusion of the first opening 19 is increased to the extent that it is closer to the first end 1a than the tool holder, fluid leakage from the second opening 21 can be prevented.

[0040] Furthermore, if the protrusion of the first opening 19 is increased to the extent that it is located closer to the first end 1a than the tool holder, the durability of the tool holder 1 at the first opening 19 may decrease. However, when the width W1 is smaller than the width W2, the portion of the tool holder 1 that experiences a decrease in durability is smaller. Therefore, the decrease in the durability of the tool holder 1 can be suppressed.

[0041] Furthermore, even if there is a slight positional shift when the tool holder is mounted on the tool turret, the cross-sectional area of ​​the flow path is not easily narrowed in the first coolant orifice 15, making it easy to supply coolant stably. Therefore, according to the tool holder 1, the degree of freedom in setting the protrusion amount is high when supplying fluid to the tool holder 1.

[0042] The width W2 of the second opening 21 along the direction of the central axis O1 can be the same as, or different from, the spacing W3 between the first opening 19 and the second opening 21. For example, as Figure 3 As in the undefined example shown, the width W2 can be larger than the spacing W3. In this case, the second opening 21 has a high degree of freedom in terms of the amount of protrusion when used as a fluid inlet.

[0043] The width W1 of the first opening 19 along the direction of the central axis O1 can be the same as, or different from, the spacing W3 between the first opening 19 and the second opening 21. For example, as Figure 3 As shown in the undefined example, the width W1 can be smaller than the interval W3. In other words, the interval W3 can be larger than the width W1. In this case, since the interval W3 is larger to ensure that the durability of the portion where the first opening 19 and the second opening 21 are configured is relatively small, it is easy to avoid a significant reduction in the durability of the tool holder 1 even when the first opening 19 and the second opening 21 are present.

[0044] The width W1 of the first opening 19, the width W2 of the second opening 21, and the interval W3 between the first opening 19 and the second opening 21 are not limited to specific values. For example, the width W1 can be set to 2 to 20 mm. Additionally, the width W2 can be set to 2 to 20 mm. The interval W3 can be set to 1 to 25 mm.

[0045] The tool holder 1 may also have an upper surface 23 and a lower surface 25. The upper surface 23 extends from the first end face 7 toward the second end 1b and connects to the first side face 9. The lower surface 25 may be located on the opposite side of the upper surface 23 and connect to the first side face 9. It should be noted that the upper surface 23 and the lower surface 25 are for convenience and do not indicate upward and downward orientation. For example, the upper surface 23 does not need to face upward when using the tool holder 1.

[0046] The width H1 of the first opening 19 in the vertical direction from the upper surface 23 to the lower surface 25 can be the same as, or different from, the width H2 of the second opening 21 in the vertical direction. For example, as Figure 4 As shown in the undefined example, the width H1 can be smaller than the width H2. In other words, in the undefined example described above, the width H2 can be larger than the width H1. In this case, the fluid outlet in the tool holder has a high degree of freedom in its position relative to the second opening 21. Furthermore, when the width H1 is smaller than the width H2, even when the first opening 19 is located closer to the first end 1a than the tool holder, the reduction in the durability of the tool holder 1 can be suppressed.

[0047] The width H1 of the first opening 19 in the vertical direction can be the same as, or different from, the width H3 of the main coolant hole 13 in the vertical direction. For example, Figure 4 As shown in the undefined example, the width H1 can be larger than the width H3. In this case, even if there is a slight positional shift when the tool holder is mounted on the tool turret, it is not easy for the cross-sectional area of ​​the flow path to narrow in the first coolant hole 15, and the coolant can be supplied stably.

[0048] The widths H1 of the first opening 19, H2 of the second opening 21, and H3 of the main coolant hole 13 are not limited to specific values. For example, width H1 can be set to 2–24 mm. Similarly, width H2 can be set to 2–24 mm, and width H3 can be set to 2–20 mm.

[0049] The tool holder 1 may also have a second side 27 and a third auxiliary coolant hole 29. The second side 27 may be located on the opposite side of the first side 9. The third auxiliary coolant hole 29 may open on the second side 27. In other words, the third auxiliary coolant hole 29 may have a third opening 31 that opens on the second side 27. The third auxiliary coolant hole 29 may open on the second side 27 of the tool holder 3. The third auxiliary coolant hole 29 may be connected to the main coolant hole 13.

[0050] The third opening 31 of the third auxiliary coolant hole 29 can be located outside the tool holder and connected to the hose supplying fluid. In other words, the third opening 31 can function as a connection port for connecting to the hose. In addition, the third opening 31 can also function as an inlet for fluid to flow into the interior of the third auxiliary coolant hole 29. Therefore, when the tool holder 1 has the third auxiliary coolant hole 29, fluid supplied from outside the tool holder can flow into the interior of the main coolant hole 13 through the third opening 31.

[0051] The length L1 of the first auxiliary coolant hole 15 can be the same as or different from the length L2 of the second auxiliary coolant hole 17. The inner diameter D1 of the first auxiliary coolant hole 15 can be the same as or different from the inner diameter D2 of the second auxiliary coolant hole 17. For example, ... Figure 10 As in the undefined example shown, length L1 can be the same as length L2, and inner diameter D1 can be the same as inner diameter D2. It should be noted that the relationship between the inner diameters can be evaluated by comparing the minimum values ​​of the inner diameters.

[0052] The length L1 of the first auxiliary coolant hole 15 can be the same as or different from the length L3 of the third auxiliary coolant hole 29. The inner diameter D1 of the first auxiliary coolant hole 15 can be the same as or different from the inner diameter D3 of the third auxiliary coolant hole 29.

[0053] For example, such as Figure 10As shown in the undefined example, the length L1 can be shorter than the length L3, and the inner diameter D1 can be smaller than the inner diameter D3. When the inner diameter D3 is larger than the inner diameter D1, the flow path loss in the third coolant hole 29 tends to be smaller compared to the first coolant hole 15. On the other hand, when the length L1 is shorter than the length L3, the flow path loss in the first coolant hole 15 tends to be smaller compared to the third coolant hole 29. Therefore, when the length L1 is shorter than the length L3 and the inner diameter D1 is smaller than the inner diameter D3, the unevenness of the flow path loss in both the first coolant hole 15 and the third coolant hole 29 is smaller.

[0054] The lengths L1 of the first auxiliary coolant hole 15, L2 of the second auxiliary coolant hole 17, and L3 of the third auxiliary coolant hole 29 are not limited to specific values. For example, length L1 can be set to 0.8 to 31 mm. Similarly, length L2 can be set to 0.8 to 31 mm, and length L3 can be set to 2 to 33 mm.

[0055] The inner diameters D1 of the first auxiliary coolant hole 15, D2 of the second auxiliary coolant hole 17, and D3 of the third auxiliary coolant hole 29 are not limited to specific values. For example, the inner diameter D1 can be set to 1.6 to 23 mm. Additionally, the inner diameter D2 can be set to 1.6 to 23 mm, and the inner diameter D3 can be set to 6 to 18 mm.

[0056] The tool holder 1 may also have a fourth auxiliary coolant hole 33. The fourth auxiliary coolant hole 33 may be located closer to the second end 1b than the third auxiliary coolant hole 29. The fourth auxiliary coolant hole 33 may open on the second side 27. In other words, the fourth auxiliary coolant hole 33 may have a fourth opening 35 on the second side 27. The fourth auxiliary coolant hole 33 may open on the second side 27 of the tool holder 3. The fourth auxiliary coolant hole 33 may be connected to the main coolant hole 13. The fourth opening 35 of the fourth auxiliary coolant hole 33 may be connected to a hose.

[0057] The tool holder 1 may also have a second end face 37 and a fifth auxiliary coolant hole 39. The second end face 37 may be located at the second end 1b. The fifth auxiliary coolant hole 39 may open on the second end face 37. In other words, the fifth auxiliary coolant hole 39 may have a fifth opening 41 that opens on the second end face 37. The fifth auxiliary coolant hole 39 may be connected to the main coolant hole 13. The fifth opening 41 of the fifth auxiliary coolant hole 39 may be connected to a hose.

[0058] Each coolant hole can be formed, for example, by using a hole machining process. Each coolant hole can be circular, elliptical, or polygonal in a cross-section orthogonal to the direction of fluid flow.

[0059] The tool holder 1 may have a flow path 43 located closer to the first end 1a than the first secondary coolant hole 15 and connected to the main coolant hole 13. The flow path 43 may have an outlet 45 opening on the first end 1a side. For example, as... Figure 1 As shown in the undefined example, the outlet 45 may be an opening in the cutter head 5. The outlet 45 functions as a portion that allows fluid to flow out toward the first end 1a. It should be noted that the location of the outlet 45 is not limited to a specific location. There may be one outlet 45, or there may be multiple outlets.

[0060] The flow path 43 can be formed, for example, by machining a hole using a drill bit or the like. The portion of the hole formed by the machining that does not function as a flow path 43 can be blocked by a sealing member to prevent fluid leakage.

[0061] Next, use Figure 13 Tool holder 1A, which is not a limited aspect of this disclosure, will be described below. Hereinafter, the differences between tool holder 1A and tool holder 1 will be mainly described, and details regarding points having the same structure as tool holder 1 will sometimes be omitted. This point is also the same in tool holder 1B, which will be described later.

[0062] In tool holder 1A, as Figure 13 As in the undefined example shown, the width W1 of the first opening 19 along the direction of the central axis O1 can be larger than the distance W3 between the first opening 19 and the second opening 21. In this case, the second opening 21 has a high degree of freedom in the amount of protrusion of the tool holder 1 when used as a fluid inlet.

[0063] In addition, even if there is a slight positional shift when the tool holder is mounted on the tool turret, the cross-sectional area of ​​the flow path will not be narrowed in the first coolant hole 15, and the coolant can be supplied stably.

[0064] Next, use Figure 14 The tool holder 1B, which is not a limited aspect of this disclosure, will be described.

[0065] In tool holder 1B, as Figure 14 As shown in the undefined example, the length L1 of the first auxiliary coolant hole 15 may be longer than the length L3 of the third auxiliary coolant hole 29. In addition, the inner diameter D1 of the first auxiliary coolant hole 15 may be smaller than the inner diameter D3 of the third auxiliary coolant hole 29.

[0066] exist Figure 14In the undefined example shown, the tool groove 11 opens to the first end face 7 and the first side face 9 as described above, allowing the installation of a cutting insert. Therefore, the cutting load generated during machining tends to be greater on the first side face 9 than on the second side face 27. However, when the length L1 of the first auxiliary coolant hole 15 is longer than the length L3 of the third auxiliary coolant hole 29, the durability of the first side face 9 is higher. Therefore, the tool holder 1B as a whole also exhibits higher durability.

[0067] <Cutting Tools>

[0068] Next, regarding the cutting tool 101 of an unlimited aspect of this disclosure, an example will be given with the tool holder 1 described above, and reference will be made to... Figures 1-12 Let me explain in detail.

[0069] like Figures 1-12 As shown in the undefined example, the cutting tool 101 may have a tool holder 1 and a cutting insert 103 (hereinafter, sometimes referred to as "insert 103") located in the tool groove 11 of the tool holder 1. When the cutting tool 101 has a tool holder 1, the degree of freedom in setting the protrusion amount is high while supplying fluid to the tool holder 1, thus enabling excellent cutting performance.

[0070] like Figure 1 As shown in the undefined example, the insert 103 can be in the shape of a polygonal plate. Additionally, the insert 103 can have a cutting edge 105. The insert 103 can be located in the tool holder 11 with the cutting edge 105 protruding outwards from the first end 1a side of the tool holder 1. The cutting tool 101 is capable of performing cutting operations by bringing the cutting edge 105 into contact with the workpiece.

[0071] The cutting tool 103 may also have a through hole 107. Additionally, the cutting tool 101 may also have a fixing member 109. The fixing member 109 may be a component for fixing the cutting tool 103 to the tool holder 1. The fixing member 109 may be a screw. It should be noted that the fixing member 109 is not limited to a screw; for example, it may be a clamping component, etc.

[0072] The tool holder 1 may have a screw hole 111 in the tool groove 11 at a position corresponding to the through hole 107. The tool 103 can be fixed to the tool holder 1 by inserting a fixing member 109 (i.e., a screw) into the through hole 107 of the blade 103 and fixing the screw to the screw hole 111 of the tool holder 1. It should be noted that the through hole 107 and the screw hole 111 can extend in a direction orthogonal to the central axis O1.

[0073] Materials used for the cutting tool 103 can include, for example, cemented carbide and cermet. Compositions of cemented carbide can include, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. Here, WC, TiC, and TaC can be hard particles, and Co can be a binder phase.

[0074] Furthermore, cermets can be sintered composite materials formed by combining metal and ceramic components. Specifically, as an example of a cermet, compounds with titanium carbide (TiC) or titanium nitride (TiN) as the main components can be listed. It goes without saying that the material of the blade 103 is not limited to the above composition.

[0075] It should be noted that, in Figure 1 In one unspecified example shown, the cutting tool 101 has a tool holder 1, but it is not limited to this method. For example, the cutting tool 101 may have a tool holder 1A or a tool holder 1B.

[0076] <Methods for Manufacturing Machined Workpieces>

[0077] Next, regarding the manufacturing method of the machined workpiece 203 from an unrestricted aspect of this disclosure, an example will be given using the cutting tool 101 described above, and reference will be made to... Figures 15-17 Let me explain in detail.

[0078] The workpiece 203 can be manufactured by machining the workpiece 201. The method for manufacturing the workpiece 203 may include the following steps:

[0079] (1) The process of rotating the workpiece 201;

[0080] (2) The process of bringing the cutting tool 101 into contact with the rotating workpiece 201; and

[0081] (3) The process of removing the cutting tool 101 from the workpiece 201.

[0082] Specifically, firstly, such as Figure 15 As shown in the undefined example, the workpiece 201 can be rotated about axis O2, and the cutting tool 101 can be brought relatively close to the workpiece 201. Next, as... Figure 16 As shown in the undefined example, the cutting edge 105 of the insert 103 in the cutting tool 101 can be brought into contact with the workpiece 201 and cut the workpiece 201. Then, as... Figure 17 As shown in the undefined example, the cutting tool 101 can be moved relatively away from the workpiece 201.

[0083] In the method for manufacturing the workpiece 203, when using a cutting tool 101 with a tool holder 1, the degree of freedom in setting the protrusion amount is high while fluid is supplied to the tool holder 1, thus enabling the workpiece 201 to be cut with excellent machining accuracy. As a result, a workpiece 203 with a high-precision machined surface can be obtained.

[0084] It should be noted that, in Figures 15-17 In one example that is not limited to the one shown, the workpiece 201 to be cut is fixed and the cutting tool 101 is moved in each process, but of course it is not limited to this manner.

[0085] For example, in step (1), the workpiece 201 can be brought closer to the cutting tool 101. Similarly, in step (3), the workpiece 201 can be moved away from the cutting tool 101. As the cutting process continues, the steps of maintaining the workpiece 201 in a rotating state and bringing the cutting edge 105 of the insert 103 into contact with different positions of the workpiece 201 can be repeated.

[0086] Materials used for the workpiece 201 include, for example, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0087] It should be noted that, in Figures 15-17 In the undefined example shown, a cutting tool 101 with a tool holder 1 is used, but this is not a limitation. For example, a cutting tool 101 with a tool holder 1A or a tool holder 1B may also be used.

[0088] Explanation of reference numerals in the attached figures

[0089] 1. Knife holder

[0090] 1a··First End

[0091] 1b··Second End

[0092] 3··· Handle

[0093] 5··· Blade tip

[0094] 7··· First end face

[0095] 9···First profile

[0096] 11··· Tool Groove

[0097] 13. Main coolant hole

[0098] 15··· First coolant hole

[0099] 17···Second coolant hole

[0100] 19···First Opening

[0101] 21···Second Opening

[0102] 23··· Upper surface

[0103] 25··· Lower surface

[0104] 27···Second side view

[0105] 29···Third coolant hole

[0106] 31···The third opening

[0107] 33··· Fourth coolant hole

[0108] 35··· Fourth opening

[0109] 37···Second end face

[0110] 39··· Fifth coolant hole

[0111] 41···The Fifth Opening

[0112] 43···Flow path

[0113] 45···Outlet

[0114] 101··· Cutting tools

[0115] 103···Cutting inserts (blades)

[0116] 105··· Cutting edge

[0117] 107··· Through Hole

[0118] 109···Fixing Components (Screws)

[0119] 111··· Screw hole

[0120] 201···Workpiece

[0121] 203···Workpiece

[0122] O1···Central Axis

[0123] O2··· axis.

Claims

1. A tool holder, which is rod-shaped extending along a central axis from a first end to a second end, wherein, The tool holder has: The first end face is located at the first end; A first side surface, which extends from the first end face toward the second end; A cutting groove, which opens relative to the first end face and the first side face, and is capable of mounting a cutting blade; A main coolant hole extends from the first end side toward the second end side; The first auxiliary coolant hole is connected to the main coolant hole; The second auxiliary coolant hole is located closer to the second end than the first auxiliary coolant hole and is connected to the main coolant hole. The tool holder is divided into a blade head located at the first end and a handle located at the second end, which is closer to the blade head. The first auxiliary coolant orifice has an opening in the first side portion that is divided into the area of ​​the tool holder, and a first opening that allows fluid to flow into the interior of the first auxiliary coolant orifice. The second auxiliary coolant orifice has an opening in the area of ​​the first side portioned as the tool holder, and a second opening allowing fluid to flow into the interior of the second auxiliary coolant orifice. The width of the first opening along the direction of the central axis is smaller than the width of the second opening along the direction of the central axis. The width of the second opening along the direction of the central axis is greater than the distance between the first opening and the second opening.

2. The tool holder according to claim 1, wherein, The width of the first opening along the direction of the central axis is smaller than the interval between the first opening and the second opening.

3. The tool holder according to claim 1, wherein, The tool holder also has: The upper surface extends from the first end face toward the second end and is connected to the first side face; as well as The lower surface, which is located on the opposite side of the upper surface with respect to the central axis, and is connected to the first side surface. The width of the first opening in the vertical direction from the upper surface toward the lower surface is smaller than the width of the second opening in the vertical direction.

4. The tool holder according to claim 3, wherein, The width of the first opening in the vertical direction is greater than the width of the main coolant hole in the vertical direction.

5. The tool holder according to claim 1, wherein, The tool holder also has: The second side is located on the opposite side of the first side with respect to the central axis; as well as The third coolant hole opens on the second side and is connected to the main coolant hole.

6. The tool holder according to claim 5, wherein, The length of the first coolant hole is shorter than the length of the third coolant hole. The inner diameter of the first auxiliary coolant hole is smaller than the inner diameter of the third auxiliary coolant hole.

7. The tool holder according to claim 5, wherein, The length of the first coolant hole is longer than the length of the third coolant hole. The inner diameter of the first auxiliary coolant hole is smaller than the inner diameter of the third auxiliary coolant hole.

8. A cutting tool, wherein, The cutting tool has: The tool holder according to any one of claims 1 to 7; and A cutting insert located in the tool slot of the tool holder.

9. A method of manufacturing a machined product, wherein the method of manufacturing the machined product includes the following steps: rotating a workpiece to be machined; contacting the cutting tool of claim 8 with the rotating workpiece to be machined; and rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece to be machined. rotating the workpiece

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