Cutting insert, rotary tool, and method for manufacturing cut product

Abstract

The blade includes a cutting portion and a shaft portion. The cutting portion includes a cutting edge located on a first end side, an end face located on a second end side, and a first through-hole extending from the end face toward the first end. The first through-hole includes a first opening located on the first end side and a second opening located on the second end side, the first opening being located rearward of the second opening in the rotational direction of the rotation axis.

Description

Technical Field

[0001] The present disclosure relates to a cutting insert, a rotary tool, and a method for manufacturing a machined product used in cutting a workpiece. Background Art

[0002] In the past, there are known rotary tools such as drills that rotate and cut a workpiece such as a metal. The cutting insert for the rotary tool has a through hole opened at the front end face (for example, see Patent Documents 1 and 2). Coolant can flow through the through hole.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2011-504810

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2014-172167 Summary of the Invention

[0007] A cutting insert in one embodiment of the present disclosure extends from a first end toward a second end along a rotation axis, and includes a cutting portion located on the first end side, and a shaft portion located on the second end side and extending along the rotation axis. The cutting portion includes a cutting edge located on the first end side, an end face located on the second end side, and a first through-hole extending from the end face toward the first end. The shaft portion extends from the end face toward the second end. The first through-hole includes a first opening located on the first end side, and a second opening located on the second end side. The first opening is located further back than the second opening in the rotation direction of the rotation axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a perspective view of a cutting insert in accordance with a non-limiting embodiment of the present disclosure.

[0009] Figure 2 It is aimed at Figure 1 The cutting insert shown is a perspective view in which three first through holes and a first groove are indicated by dotted lines.

[0010] Figure 3 Viewed from the first end Figure 1 A front view of the cutting insert is shown.

[0011] Figure 4 It is aimed at Figure 3 The cutting insert shown is a front view in which three first through holes and a first groove are indicated by dotted lines.

[0012] Figure 5It is from Figure 3 Observation direction A1 shown Figure 1 A side view of the cutting insert is shown.

[0013] Figure 6 It is from Figure 3 Observation direction A2 shown Figure 1 A side view of the cutting insert is shown.

[0014] Figure 7 Viewed from the second end Figure 1 A rear view of the cutting insert is shown.

[0015] Figure 8 It is a side view showing a rotary cutter in a non-limiting embodiment of the present disclosure.

[0016] Figure 9 Viewed from the first end Figure 8 The front view of the rotating tool is shown.

[0017] Figure 10 It is from Figure 9 A3 direction of observation shown Figure 8 A side view of the rotating tool is shown.

[0018] Figure 11 It is from Figure 9 A4 orientation as shown Figure 8 A side view of the rotating tool is shown.

[0019] Figure 12 It is a perspective view showing a knife handle in a non-limiting embodiment of the present disclosure.

[0020] Figure 13 is Figure 8 An enlarged view of the front end portion of the first end side of the rotary cutter is shown.

[0021] Figure 14 yes Figure 8 The rotating tool shown in Figure 13 The D1-D1 cross-sectional view is shown.

[0022] Figure 15 yes Figure 8 The rotating tool shown in Figure 13 The D2-D2 cross-sectional view is shown.

[0023] Figure 16 yes Figure 8 The rotating tool shown in Figure 13 The D3-D3 cross-sectional view is shown.

[0024] Figure 17This is a schematic diagram showing an example of the process of a method for producing a machined product in a non-limiting embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] Hereinafter, the cutting insert (hereinafter also referred to as the insert), the rotary tool, and the method for manufacturing a cut workpiece according to an unrestricted embodiment of the present disclosure will be described in detail using the accompanying drawings. However, for ease of description, the figures referenced below only simplify the main components required to illustrate the embodiments. Therefore, the insert and the rotary tool can have any components not shown in the figures referenced in this specification. In addition, the dimensions of the components in the figures do not faithfully represent the dimensions of the actual components and the dimensional ratios of the components.

[0026] (1. Overview of Blade)

[0027] First, use Figures 1 to 7 The outline of the insert 1 according to the embodiment will be described. Figure 1 It is a perspective view of the blade 1. Figure 2 It is aimed at Figure 1 The insert 1 shown is a perspective view in which the first through hole 13 and the first groove 21 of the insert 1 are indicated by dotted lines. Figure 3 This is a front view of the insert 1 as viewed from the first end 10A side. Figure 4 It is aimed at Figure 3 The insert 1 shown is a front view in which the first through hole 13 is indicated by a dotted line. Figure 5 It is from Figure 3 The illustrated diagram is a top view of the blade 1 viewed from direction A1. Figure 6 It is from Figure 3 The side view of the blade 1 is shown when viewed from the direction A2. Figure 7 This is a rear view of the blade 1 as viewed from the second end 20A side.

[0028] like Figures 1 to 7 As shown, the insert 1 extends from a first end 10A toward a second end 20A along a rotation axis X1 and has a cutting portion 10 located on the first end 10A side and a shaft portion 20 located on the second end 20A side.

[0029] The shaft portion 20 extends along the rotation axis X1. The shaft portion 20 can be mounted on the handle 102 (see Figures 8 to 12 When the tool is mounted on the tool holder 102, the tool is fixed by being engaged with the tool groove 120 provided on the tool holder 102, thereby serving as a portion constrained by the tool holder 102.

[0030] The cutting portion 10 is a cutting portion that is formed in contact with a workpiece T (see FIG. Figure 17 ) contact part, and it is the part that plays a major role in the cutting process.

[0031] The blade 1 can rotate around the rotation axis X1 when cutting the workpiece. Figure 1 The arrow X2 shown about the rotation axis X1 represents the rotation direction of the blade 1. The end of the cutting portion 10 along the direction of the rotation axis X1 (i.e., the front end of the blade 1) is referred to as a first end 10A, and the end of the shaft portion 20 on the side away from the cutting portion 10 along the direction of the rotation axis X1 (i.e., the rear end of the blade 1) is referred to as a second end 20A.

[0032] The shaft portion 20 may also have a planar rear end face 22 including the second end 20A. The detailed shape of the shaft portion 20 will be described later. In addition, the cutting portion 10 has an end face 12 located at the side of the second end 20A. The end face 12 is provided when the blade 1 is mounted on the handle 102 (see FIG. Figure 8 etc.), with the knife groove 120 (refer to Figure 12 )'s front end side end face 130 abuts the surface.

[0033] In this specification, the record of "flat" or "plane" means that it is not a curved surface of a level that can be visually confirmed, or does not have the concave-convex of a level that can be visually confirmed. Therefore, the surface recorded as "flat" or "plane" can also allow for the concave-convex of an inevitable degree in the manufacture of the blade 1. Specifically, it is also possible to have a concave-convex surface roughness of, for example, about 50 μm. In addition, the "rotational axis" can also be expressed as a straight line (center line, central axis) through the center or approximately the center of the rear end face 22 of (i) the first end 10A, (ii) the shaft portion 20.

[0034] The size of the shaft portion 20 is not particularly limited. The maximum width of the shaft portion 20 in the direction perpendicular to the rotation axis X1 can be set to, for example, approximately 3 to 10 mm. In addition, the dimension of the shaft portion 20 along the rotation axis X1 (the longitudinal direction) can also be set to, for example, approximately 3 to 10 mm.

[0035] The size of the cutting portion 10 is also not particularly limited. When the cutting portion 10 is viewed from the first end 10A side parallel to the rotation axis X1 and an imaginary circle is drawn with the rotation axis X1 as the center point and in contact with the outer edge of the cutting portion 10, the diameter of the imaginary circle can be set to, for example, approximately 10 to 40 mm. Furthermore, the dimension of the cutting portion 10 from the first end 10A to the end surface 12 along the rotation axis X1 can be set to, for example, approximately 5 to 20 mm.

[0036] The cutting portion 10 and the shaft portion 20 of the insert 1 may be formed separately or integrally.

[0037] (2. Details of the blade)

[0038] In conventional cutting inserts (see, for example, Patent Documents 1 and 2), through-holes are formed parallel to the axis of rotation or radially inclined relative to the axis of rotation. Coolant is allowed to flow through these through-holes, thereby cooling the workpiece. However, the cutting inserts described in Patent Documents 1 and 2 may not provide sufficient cooling for the cutting edge.

[0039] According to one aspect of the present disclosure, a cutting insert capable of achieving a cooling effect on a cutting edge can be realized.

[0040] (Cutting part)

[0041] like Figures 1 to 7 As shown, in this example, the cutting portion 10 of the insert 1 has three cutting edges 11 (11A, 11B, 11C) located on the first end 10A side and an end surface 12 located on the second end 20A side. In addition, the cutting portion 10 has three first through holes 13 (13A, 13B, 13C).

[0042] The three first through-holes 13 (13A, 13B, 13C) extend from the end surface 12 toward the first end 10A within the cutting portion 10. Each of the three first through-holes 13 (13A, 13B, 13C) has a first opening 14 (14A, 14B, 14C) located on the first end 10A side and a second opening 15 (15A, 15B, 15C) located on the second end 20A side. The three first through-holes 13 (13A, 13B, 13C) extend from the end surface 12 toward the first end 10A within the cutting portion 10, and the three first openings 14 (14A, 14B, 14C) are located on the polishing surface (described later).

[0043] In this example, the insert 1 is described as having three cutting edges 11 and three first through-holes 13. However, the number of cutting edges 11 and first through-holes 13 included in the insert 1 is not particularly limited. For example, the insert 1 may have two cutting edges 11, or may have four or more cutting edges 11. Furthermore, for example, the insert 1 may have two first through-holes 13, or may have four or more first through-holes 13. The insert 1 generally has the same number of first through-holes 13 as the number of cutting edges 11.

[0044] In this example, the direction of rotation of the blade 1 is indicated by arrow X2, for example, counterclockwise when viewing the blade 1 from the first end 10A. The three cutting edges 11 of the blade 1 of this example are referred to as cutting edge 11A, cutting edge 11B, and cutting edge 11C, respectively, in clockwise order, opposite to the direction of rotation indicated by arrow X2. Furthermore, the three first through-holes 13 of the blade 1 of this example are referred to as first through-hole 13A, first through-hole 13B, and first through-hole 13C, respectively, in clockwise order.

[0045] In the insert 1, the three cutting edges 11 and the three first through holes 13 may also be located in positions that are rotationally symmetrical about the rotation axis X1. In this example, regarding the cutting portion 10 of the insert 1, the three cutting edges 11 and the three first through holes 13 are located in positions that are rotationally symmetrical about the rotation axis X1 and have similar structures. Therefore, the following detailed description will focus on the cutting edge 11A and the first through hole 13A of the three cutting edges 11 and the three first through holes 13, and the description of the other cutting edges 11B, 11C and the first through holes 13B, 13C will be omitted.

[0046] like Figure 3 As shown, the cutting edge 11A includes a chisel edge 16A extending from the position of the rotation axis X1 (the position of the first end 10A) toward the outer periphery of the cutting portion 10, a dressing edge 17A extending from the chisel edge 16A toward the outer periphery, and a main cutting edge 18A extending from the dressing edge 17A toward the outer periphery. The cutting portion 10 has a dressing surface 70A extending from the dressing edge 17A toward the second end 20A.

[0047] First through-hole 13A is a flow path for coolant (coolant) supplied from the tool holder and flowing into second opening 15A when blade 1 is attached to the tool holder. The coolant passes through first through-hole 13A and is sprayed from first opening 14A toward first end 10A of blade 1. Specifically, the coolant is not particularly limited, but examples thereof include water, oil, and emulsion.

[0048] In the blade 1 of this example, the positional relationship between the first opening 14A of the first through hole 13A and the second opening 15A is as follows. That is, the first opening 14A is positioned at the rear of the second opening 15A in the direction of rotation shown in the arrow X2. In this example, as shown in the arrow X2, the direction of rotation of the blade 1 is, for example, the counterclockwise direction when observing the situation of the blade 1 from the first end 10A side main view. The first opening 14A can also show as being positioned at the clockwise direction side relative to the second opening 15A.

[0049] In other words, the first through hole 13A is set so that the blade 1 is observed from the main view of the first end 10A side, for example, and a flow path is formed inside the cutting portion 10 that is inclined toward the direction of rotation (counterclockwise direction) of the blade 1 relative to a direction parallel to the rotation axis X1, based on the position of the first opening 14A. According to this structure, the coolant is easily sprayed toward the cutting edge 11 (11A) located behind the first opening 14 (14A) in the rotation direction X2. In addition, the deviation of the strength of the cutting portion 10 in the circumferential direction is easily reduced. Therefore, it is easy to improve the durability of the blade 1.

[0050] Furthermore, first opening 14A of first through-hole 13A is located on the ground surface 70A. This configuration improves chip discharge efficiency and cooling efficiency. Specifically, compared to a case where first opening 14A is located on the ground surface 70A, the flow of chips flowing toward second end 20A in discharge groove 80A is less likely to be obstructed when first opening 14A is located on the ground surface 70A.

[0051] Furthermore, compared to a case where the first opening 14A is located on the finished surface 70A, for example, because the first opening 14A is located forward of the cutting edge 11A in the rotational direction X2, the cooling effect of the coolant is greater. Furthermore, compared to a case where the first opening 14A is located on the finished surface 70A, for example, the strength reduction of the cutting edge 11A caused by the provision of the first through-hole 13A is more easily avoided. In other words, the durability of the cutting edge 11A is enhanced.

[0052] In addition, in the blade 1 of this example, the blade 1 is observed from the first end 10A side and the first through hole 13 is virtually viewed from the front (front perspective), and the first opening 14A and the second opening 15B of the first through hole 13B may also overlap with each other at least in part (refer to FIG. Figure 4 In this case, since the three first through holes 13 (13A, 13B, 13C) are provided rotationally symmetrically on the blade 1, when the blade 1 is viewed from the first end 10A side (front perspective), the second opening 15A of the first through hole 13A is at a position that at least partially overlaps with the first opening 14C of the first through hole 13C.

[0053] In the blade 1, when the blade 1 is viewed from the first end 10A side (front perspective), the position of the first opening 14A can be farther from the rotation axis X1 than the position of the second opening 15A. In other words, when the blade 1 is viewed from the first end 10A side, the distance L1 between the first opening 14A and the rotation axis X1 can be longer than the distance L2 between the second opening 15A and the rotation axis X1. The distance L1 is the length of the line segment that connects the edge of the periphery of the first opening 14A that is close to the rotation axis X1 to the rotation axis X1 and is orthogonal to the rotation axis X1. The distance L2 is the length of the line segment that connects the edge of the periphery of the second opening 15A that is close to the rotation axis X1 to the rotation axis X1 and is orthogonal to the rotation axis X1.

[0054] Because the cutting speed is relatively slow in areas of the cutting edge 11A extending from the rotation axis X1, such as the chisel edge 16A, a high cutting load is likely to be applied near this area of ​​the cutting edge 11A during cutting. However, when the first opening 14A is relatively far from the rotation axis X1 (when the first opening 14A is located relatively far from the rotation axis X1), it is easier to ensure a thicker wall thickness in the cutting portion 10 near areas of the cutting edge 11A extending from the rotation axis X1, such as the chisel edge 16A. Consequently, the durability of the cutting portion 10 is enhanced.

[0055] Furthermore, when the first opening 14A is positioned farther from the rotation axis X1 than the second opening 15A (i.e., L1 > L2), the coolant ejected from the first opening 14A tends to flow outward. This facilitates cooling a wide area of ​​the cutting edge 11, resulting in a greater cooling effect.

[0056] In addition, from the first end 10A side main view, observe blade 1, and three first openings 14 (14A, 14B, 14C) corresponding to three first through holes 13A, 13B, 13C may not be rotationally symmetrical with the rotation axis X1. Specifically, from the first end 10A side main view, observe blade 1, and the distance from the rotation axis X1 to three first openings 14 (14A, 14B, 14C) may also be different from each other. For example, the distance from the rotation axis X1 to the first opening 14A may also be different from the distance from the rotation axis X1 to the first opening 14B.

[0057] According to the above configuration, it is easy to reduce cooling deviation in the radial direction of the cutting edge 11 extending from the rotation axis X1 toward the outer periphery of the cutting portion 10. Therefore, the cooling effect of the coolant is improved.

[0058] The cutting portion 10 has a discharge groove 80A extending from the main cutting edge 18A toward the second end 20A. The portion of the discharge groove 80A along the main cutting edge 18A can function as a rake face. The discharge groove 80A is adjacent to the grinding surface 70A. The discharge groove 80A is a groove for improving the discharge of chips of the workpiece cut by the cutting edge 11A. In the blade 1 of this example, the second opening 15B can also be located away from the ridge line 81A (see FIG. 1 ) where the discharge groove 80A intersects the end face 12. Figure 7 ) location.

[0059] According to the above configuration, since leakage of the cooling liquid into the discharge groove 80A is reduced, the cooling liquid can be stably ejected from the first opening 14A.

[0060] The insert 1 has three discharge grooves 80 (discharge groove 80A, discharge groove 80B, and discharge groove 80C) corresponding to the three main cutting edges 18 (main cutting edge 18A, main cutting edge 18B, and main cutting edge 18C) of the three cutting edges 11. The ridge line where the end surface 12 intersects the discharge groove 80B is referred to as the ridge line 81B, and the ridge line where the end surface 12 intersects the discharge groove 80C is referred to as the ridge line 81C. In the insert 1 of this example, the second opening 15A is located at a position away from the ridge line 81C, and the second opening 15C is located at a position away from the ridge line 81B. Thus, as described above, coolant can be stably ejected from the first opening 14B and the first opening 14C.

[0061] (Shaft)

[0062] The shaft portion 20 of the blade 1 of this embodiment may also be in the following shape, which can be fitted into the blade groove 120 fixed to the handle 102 (see Figure 12 ), and in such a fixed state, the coolant can flow between the knife groove 120 and the shaft portion 20.

[0063] Specifically, the shaft portion 20 may include three flow paths 23 extending from the three second openings 15 formed in the end surface 12 of the cutting portion 10 toward the second end 20A. The flow paths 23 form a portion of the coolant flow path. The flow paths 23 may be planar or substantially planar, or may be curved and concave in the direction of the rotation axis X1.

[0064] The shaft portion 20 may have a curved surface 24 having a shape corresponding to the outer circumference of a cylinder between the two flow paths 23. In this example, the shaft portion 20 has three curved surfaces 24. For example, the shaft portion 20 may have a shape roughly similar to that of a cylinder, with three flow paths 23 and three curved surfaces 24 formed by cutting out relatively small semi-elliptical cylinders at three locations near the outer circumference of the cylinder. The shaft portion 20 may also be chamfered between the curved surface 24 and the rear end surface 22.

[0065] Furthermore, the diameter (width in a direction perpendicular to the rotation axis X1) of the cylindrical shaft portion 20 may not necessarily be constant from the first end 10A side toward the second end 10B side. For example, the end portion of the shaft portion 20 on the second end 10B side may be chamfered as described above, or the end portion on the first end 10A side (the boundary between the cutting portion 10 and the shaft portion 20) may be rounded. Furthermore, the diameter of the shaft portion 20 may gradually increase from the end portion on the first end 10A side toward the end portion on the second end 10B side. Specifically, the shaft portion 20 may have a truncated cone shape.

[0066] In the blade 1, the three flow paths 23 may also be located at positions that are rotationally symmetrical with respect to the rotation axis X1. In this example, the shaft 20 in the blade 1 has three flow paths 23, but this is not limited thereto. The flow paths 23 may be provided with the same number as the first through-holes 13.

[0067] Furthermore, the shaft portion 20 may include a first groove 21 extending from the first through-hole 13A toward the second end 20A in a portion of the flow surface 23. Furthermore, the first groove 21 may be parallel to the first through-hole 13A. Typically, during the manufacturing process of the cutting portion 10, when the first through-hole 13 is formed by drilling, the first groove 21 is formed by the tool used for drilling contacting a portion of the flow surface 23.

[0068] When the shaft portion 20 has the first groove 21, the coolant can flow smoothly from the flow path (flow surface 23) in the shaft portion 20 into the first through-hole 13A. In particular, when the first groove 21 extends parallel or substantially parallel to the first through-hole 13A, the coolant can flow even more smoothly into the first through-hole 13A.

[0069] (3. Composition of Rotating Cutters)

[0070] Next, for the rotary cutter 100 in one example of the present disclosure, use Figures 8 to 16 Provide explanation. Figure 8 It is a side view showing the rotary cutter 100 . Figure 9 This is a front view of the rotary cutter 100 as viewed from the first end 10A side. Figure 10 It is from Figure 9 The illustrated diagram is a top view of the rotary cutter 100 as viewed from the direction A3. Figure 11 It is from Figure 9 The illustrated diagram is a side view of the rotary cutter 100 as viewed from the direction A4. Figure 12 It is a perspective view showing the knife handle 102 . Figure 13 This is an enlarged view of the front end portion of the rotary cutter 100 on the first end 10A side. Figure 14 The number of the rotating cutter 100 is represented by Figure 13 A cross-sectional view of the D1-D1 section is shown. Figure 15 The number of the rotating cutter 100 is represented by Figure 13 A cross-sectional view of the D2-D2 section is shown. Figure 16 The number of the rotating cutter 100 is represented by Figure 13 A cross-sectional view of the D3-D3 section is shown.

[0071] like Figures 8 to 16As shown, the rotary tool 100 is a so-called insert-type drill in which a blade 1 and a shank 102 are formed separately and the blade 1 is attached to the front end of the shank 102. The rotary tool 100 has a rotation axis X1 and rotates around the rotation axis X1.

[0072] The rotary tool 100 in this example is a single-chip drill equipped with a single insert 1. However, rotary tools equipped with the insert 1 are not limited to single-chip drills. Furthermore, the rotary tool is not limited to a drill that moves relative to the workpiece along the rotation axis X1 to perform hole drilling. A rotary tool capable of milling the workpiece while rotating and moving in any direction may also be used. Examples of rotary tools equipped with the insert 1 include end mills and milling cutters.

[0073] The tool holder 102 may include a shank 103 extending along the rotation axis X1 and a body 104. The shank 103 may be in the shape of a rod extending along the rotation axis X1, and may be a portion to be gripped by a machine tool, for example.

[0074] The main body 104 has a discharge groove 110 on the side for discharging chips of the workpiece T. In addition, the main body 104 has a knife groove 120 opened at the front end side. The shaft portion 20 of the blade 1 is mounted on the knife groove 120. The blade 1 can be mounted on the handle 102 (main body 104) by, for example, screws (not shown).

[0075] The end surface 130 of the main body 104 at the front end on the blade 1 side contacts the end surface 12 of the blade 1. The discharge groove 110 is connected to the discharge groove 80 of the blade 1.

[0076] The tool holder 102 has a second through hole 150 extending along the rotation axis X1 inside the shank portion 103 and the body 104 . The second through hole 150 serves as a flow path for coolant and communicates with the sipe 120 .

[0077] The rotary tool 100 has a flow path surface 23 on the shaft 20, thereby creating a gap between the shaft 20 and the inner peripheral wall of the groove 120 within the space of the groove 120. Therefore, the coolant reaching the rear end surface 22 of the shaft 20 through the second through hole 150 can flow toward the second opening 15 through the gap.

[0078] The rotary tool 100 may also include a curved second groove 125 that is recessed in a direction away from the rotation axis X1 in a portion of the inner circumferential wall surface of the slit 120 that faces the flow path 23. The second grooves 125 may be provided in the same number as the flow path 23 in the shaft portion 20. The flow path 23 and the second grooves 125 form a gap flow path 128 between the slit 120 and the shaft portion 20. The presence of the second groove 125 increases the volume of the gap flow path 128. In addition, the portion of the inner circumferential wall surface of the slit 120 other than the second groove 125 abuts against the curved surface 24. As a result, the shaft portion 20 mounted on the slit 120 can be stably fixed and the coolant can easily flow through the gap flow path 128.

[0079] like Figure 15 As shown, by forming the first groove 21 in a portion of the flow path surface 23 , the area of ​​the gap flow path 128 in a plan view can be further increased.

[0080] The coolant is supplied to the clearance flow path 128 through the second through-hole 150, passes through the clearance flow path 128, reaches the second opening 15, and then is released from the second opening 15 through the first through-hole 13 and out of the first opening 14. The coolant released from the first opening 14 contacts the cutting edge 11, cooling the cutting edge 11. The coolant then passes through the discharge groove 80 and the discharge groove 110 and is discharged to the outside of the machined hole of the workpiece.

[0081] <Method for Manufacturing Machined Product>

[0082] Next, use Figure 17 A method for producing a machined product in a non-limiting embodiment of the present disclosure will be described. Figure 17 1 and 2 are schematic diagrams showing the steps of a method for producing a machined product in a non-limiting embodiment of the present disclosure. A method for producing a machined product U by cutting a workpiece T using the rotary tool 100 will be described below.

[0083] The method for manufacturing a machined product U according to an unrestricted embodiment of the present disclosure may include the following steps.

[0084] (1) a step of rotating the rotary cutter 100;

[0085] (2) a step of causing the rotary tool 100 to be brought into contact with the cutting material T; and

[0086] (3) A step of separating the rotary tool 100 from the workpiece T.

[0087] More specifically, first, if Figure 17As shown in the figure with reference numeral 1701, a workpiece T is prepared just below the rotary tool 100, and the rotary tool 100 mounted on the machine tool is rotated around the rotation axis X1. Examples of the workpiece T include aluminum, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0088] Next, if Figure 17 As shown in the figure with reference numeral 1702, the rotary tool 100 is brought close to the workpiece T and brought into contact with the workpiece T. As a result, the workpiece T is cut by the cutting edge 11 of the insert 1, forming a machined hole V. Chips of the cut workpiece T are discharged to the outside from the discharge groove 80 of the insert 1 through the discharge groove 110 of the shank 102. The method of bringing the rotary tool 100 and the workpiece T into relative proximity is not particularly limited. For example, the rotary tool 100 can be moved toward a fixed workpiece T, or the workpiece T can be moved relative to the rotary tool 100, which is fixed and rotates.

[0089] Then, if Figure 17 As shown in the figure with reference numeral 1703, the rotary tool 100 is moved away from the workpiece T. Thus, the workpiece T in which the machined hole V is formed, that is, the machined product U is produced.

[0090] <Modification>

[0091] In the above embodiment, the so-called blade-type rotary cutter 100 composed of the blade 1 and the handle 102 is described. However, the configuration of the rotary cutter 100 is not limited thereto. For example, the so-called integral rotary cutter may also be formed integrally with the blade 1 and the handle 102.

[0092] (Supplementary Explanations)

[0093] The invention disclosed herein has been described above based on the accompanying drawings and embodiments. However, the invention disclosed herein is not limited to the above-mentioned embodiments. That is, the invention disclosed herein can be subjected to various changes within the scope shown in the present disclosure, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the invention disclosed herein. In other words, it should be noted that it is easy for those skilled in the art to make various deformations or modifications based on the present disclosure. In addition, it should be noted that these deformations or modifications are included in the scope of the present disclosure.

[0094] Description of Reference Numerals

[0095] 1 blade (cutting blade)

[0096] 10 cutting part

[0097] 10A first terminal

[0098] 11, 11A, 11B, 11C cutting edges

[0099] 12, 130 end face

[0100] 13, 13A-13C first through hole

[0101] 14, 14A~14C first opening

[0102] 15, 15A~15C second opening

[0103] 16A chisel edge

[0104] 17A sharpening blade

[0105] 18, 18A ~ 18C main cutting edge

[0106] 20 shaft

[0107] 20A second terminal

[0108] 21 First Slot

[0109] 70A grinding surface

[0110] 80, 80A~80C, 110 discharge trough

[0111] 81A~81C ridgeline

[0112] 100 rotary cutters

[0113] 102 handle

[0114] 125 Second Slot

[0115] 150 second through hole

[0116] X1 rotation axis

[0117] X2 arrow (direction of rotation).

Claims

1. A cutting insert, wherein: The cutting blade extends along the rotation axis from the first end toward the second end, The cutting insert has: a cutting portion located on the first end side; and a shaft portion located on the second end side and extending along the rotation axis, The cutting portion has: a cutting edge located at the first end side; an end surface located on the second end side; and a first through hole extending from the end surface toward the first end, The shaft portion extends from the end surface toward the second end, The first through hole has: a first opening located at the first end side; as well as a second opening, which is located at the second end side, The first opening is located behind the second opening in the rotation direction of the rotation shaft. The cutting edge has: a chisel edge extending from the rotation axis toward the periphery; a sharpening edge extending from the chisel edge toward the outer periphery; as well as a main cutting edge extending from the grinding edge toward the outer periphery, The cutting portion further comprises a grinding surface extending from the grinding edge toward the second end. The first opening is located on the grinding surface.

2. The cutting insert according to claim 1, wherein The shaft portion has a first groove extending from the first through hole toward the second end.

3. The cutting insert according to claim 1, wherein The cutting portion further has a discharge groove extending from the main cutting edge toward the second end, The second opening is located away from the discharge slot.

4. The cutting insert according to any one of claims 1 to 3, wherein The first opening is located farther from the rotation axis than the second opening in a front view from the first end side.

5. A rotary tool, wherein: The rotary cutter has: The cutting insert according to any one of claims 1 to 4; and The tool handle is in a rod shape and extends along the rotation axis and abuts against the end surface. The rotary cutter according to claim 5 , wherein: The knife handle has: a second through hole extending along the rotation axis; and A second groove is connected to the first through hole and the second through hole of the cutting insert.

7. The rotary cutter according to claim 6, wherein: The shaft portion has a first groove extending from the first through hole toward the second end, The second groove is opposite to the first groove.

8. A method for producing a machined product, wherein: The method for manufacturing the machined product comprises: The step of rotating the rotary cutter according to any one of claims 5 to 7; a step of bringing the rotating tool into contact with a workpiece; and a step of separating the rotary cutter from the workpiece.

Images