Methods for manufacturing cutting tools, rotary tools and workpieces

Abstract

The cutting tool has a body extending from a first end toward a second end. The body has a cutting edge, a rake face, and a discharge groove. In the rake face, the second rake angle of the second face region, located closer to the second end than the first face region connected to the cutting edge, is smaller than the first rake angle of the first face region. The third rake angle of the third face region, located rearward in the direction of rotation and adjacent to the outer periphery of the body relative to the discharge groove, is smaller than the second rake angle.

Description

Technical Field

[0001] This disclosure relates to a cutting tool, a rotary tool, and a method for manufacturing a workpiece used in the cutting of a workpiece. Background Technology

[0002] As a rotary tool used for cutting materials such as metals, a drill bit as described in Patent Document 1 is known. The drill bit described in Patent Document 1 has a cutting edge (cutting edge), a rake face, and a spiral chip removal groove (discharge groove). When the rotating drill bit contacts the workpiece to perform hole cutting, the chips generated by the cutting edge bend on the rake face and are discharged to the outside of the workpiece through the discharge groove.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2019-501787 Summary of the Invention

[0006] A cutting tool, without limitation, has a body extending along a rotation axis from a first end toward a second end. The body has a cutting edge located on the first end side, a rake face extending from the cutting edge toward the second end, and a discharge groove extending from the rake face toward the second end. The rake face has: a first face region connected to the cutting edge and having a first rake angle; a second face region located closer to the second end than the first face region and having a second rake angle; and a third face region located closer to the second end than the second face region and having a third rake angle. The discharge groove is located closer to the second end than the second face region. The third face region is adjacent to the discharge groove on the outer periphery side of the body, behind the discharge groove in the rotation direction of the rotation axis. The second rake angle is smaller than the first rake angle, and the third rake angle is smaller than the second rake angle. Attached Figure Description

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

[0008] Figure 2 Viewed from the first end side Figure 1 The front view of the cutting tool shown.

[0009] Figure 3 From Figure 2 Observation in direction A1 as shown Figure 1 The side view shown is taken when the cutting tool is being used.

[0010] Figure 4 From Figure 2Observation in direction A2 as shown Figure 1 The top view of the cutting tool shown.

[0011] Figure 5 yes Figure 2 A cross-sectional view of the VV line.

[0012] Figure 6 yes Figure 2 A sectional view along line VI-VI.

[0013] Figure 7 yes Figure 2 A sectional view along line VII-VII.

[0014] Figure 8 yes Figure 4 A sectional view along line VIII-VIII.

[0015] Figure 9 yes Figure 4 A sectional view along the IX-IX line.

[0016] Figure 10 yes Figure 4 A sectional view along the XX line.

[0017] Figure 11 This is a perspective view showing a rotating tool in a non-limiting embodiment of the present disclosure.

[0018] Figure 12 Is Figure 11 The image shown is an enlarged view of the front end portion of the first end side in the rotating tool.

[0019] Figure 13 This is a simplified diagram illustrating an example of the steps in a method for manufacturing a machined object according to a non-limiting embodiment of this disclosure. Detailed Implementation

[0020] Hereinafter, a method for manufacturing a cutting tool (hereinafter referred to simply as a tool), a rotary tool, and a workpiece according to a non-limiting embodiment of this disclosure will be described in detail using the accompanying drawings. However, for ease of explanation, only the main components necessary for illustrating the embodiments are shown in the following figures. Therefore, the tool and rotary tool may have any structural 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 actual dimensions of the structural components or the dimensional ratios of each component.

[0021] (1. A brief overview of the cutting tool)

[0022] First, use Figures 1-4 Here is a brief description of the cutting tool 1 used in the implementation method. Figure 1 This is a 3D view of tool 1. Figure 2 This is the front view of tool 1 when viewed from the first end 10A side. Figure 3 From Figure 2 The side view of tool 1 as shown in direction A1. Figure 4 From Figure 2 The top view of tool 1 as shown in direction A2.

[0023] like Figures 1-4 As shown, the tool 1 in this example includes: a body 2 that extends along the rotation axis R1 from the first end 10A toward the second end 3A and is located on the side of the first end 10A; and a shaft portion 3 that is located on the side of the second end 3A.

[0024] The cutting tool 1 has a cutting portion 10 formed on the first end 10A side of the main body 2. In the cutting process (hole drilling) described later, the cutting portion 10 interacts with the workpiece material T (refer to...) which is the object of machining. Figure 13 The contact area is the part that plays a major role in the cutting process. Details regarding the main body 2 having the cutting part 10 will be described later.

[0025] When cutting the workpiece, tool 1 can rotate around the rotation axis R1. Figure 1 Arrow R2 shown around the rotation axis R1 indicates the rotation direction of the tool 1. The end of the cutting portion 10 (i.e. the front end of the tool 1) along the rotation axis R1 is called the first end 10A, and the end of the shaft portion 3 on the side away from the cutting portion 10 along the rotation axis R1 (i.e. the rear end of the tool 1) is called the second end 3A.

[0026] Shaft 3 extends along the rotation axis R1. Shaft 3 is used to mount the tool 1 onto the tool holder 102 (described later) (see reference). Figure 11 , Figure 12 When used, it can be used as a part that is constrained by the tool holder 102 by engaging and fixing with the slot 111 provided on the tool holder 102.

[0027] The size of the shaft portion 3 is not particularly limited, and the maximum width of the shaft portion 3 in the direction orthogonal to the rotation axis R1 can be set to, for example, 3 to 10 mm. In addition, the dimension of the shaft portion 3 along the direction (length direction) of the rotation axis R1 can also be set to, for example, 3 to 10 mm.

[0028] The size of the main body 2 is not particularly limited. When viewing the main body 2 from the first end 10A side parallel to the rotation axis R1, and drawing an imaginary circle tangent to the outer edge of the main body 2 with the rotation axis R1 as the center point, the diameter of this imaginary circle can be set to, for example, 10 to 40 mm. In addition, the dimension of the main body 2 from the first end 10A to the rear end of the main body 2 (the connection between the main body 2 and the shaft portion 3) along the direction of the rotation axis R1 can be set to, for example, 5 to 20 mm.

[0029] The main body 2 and shaft 3 of the cutting tool 1 can be formed separately and joined together, or they can be formed as one piece.

[0030] (2. Definition of the term)

[0031] In this specification, the terms "flat" or "planar" are intended to refer to surfaces that are not visually recognizable or do not have visually recognizable unevenness. Therefore, a surface described as "flat" or "planar" may also have an unavoidable degree of unevenness during the manufacture of the tool 1. Specifically, it may have an unevenness with a surface roughness of, for example, around 50 μm. In addition, the "rotation axis" may also be a straight line (centerline, central axis) passing through the center or approximately the center of the surface of (i) the first end 10A and (ii) the second end 3A of the shaft portion 3.

[0032] in addition, Figure 2 The main view is a view of the tool 1 as seen from the first end 10A. The tool 1 is viewed from the first end 10A side, parallel to the rotation axis R1, as the main view.

[0033] in addition, Figure 3 Side view and Figure 4 The top view is a view of tool 1 viewed from a direction perpendicular to the rotation axis R1. The tool 1 is viewed from a side view when viewed from a direction perpendicular to the rotation axis R1.

[0034] (3. Detailed information about the cutting tools)

[0035] In conventional drills (e.g., see Patent Document 1), attempts are made to control the chips into a desired shape on the rake face. However, because the chips are controlled into a desired shape, there is a possibility that the direction of chip flow may become unstable. Specifically, the chips may not flow towards the discharge groove but instead go towards the outer periphery of the drill bit (the external direction), which may cause damage to the machined surface of the material being cut (the inner wall of the machined hole).

[0036] The cutting tool in one embodiment of this disclosure has a structure that allows chips to flow easily toward the discharge groove.

[0037] For details regarding tool 1, please refer to the following: Figures 1-10Let me explain. Figures 5-7 They are Figure 2 A sectional view along lines VV, VI-VI, and VII-VII. Figures 8-10 They are Figure 4 The sectional view along lines VIII-VIII, IX-IX, and XX. Lines VV, VI-VI, and VII-VII are orthogonal to the cutting edge 11 when the tool 1 is viewed from the first end 10A.

[0038] exist Figure 4 The VV line, VI-VI line, and VII-VII line shown are for... Figures 5-7 The sectional view shown is easy to understand and can be used for reference. Figures 5-7 The cross-section shown is parallel to the axis of rotation R1, but not parallel to... Figure 4 The section perpendicular to the plane shown in the side view (refer to) Figure 2 In contrast, Figures 8-10 The cross section shown is parallel to and parallel to the axis of rotation R1. Figure 4 The cross section perpendicular to the plane when viewed from the side.

[0039] like Figures 1-10 As shown, the main body 2 of the tool 1 has a cutting edge 11 located on the side of the first end 10A, a rake face 80 extending from the cutting edge 11 toward the second end 3A, and a discharge groove 90 extending from the rake face 80 toward the second end 3A. The rake face 80 can extend from the cutting edge 11 toward the second end 3A, and the discharge groove 90 can extend from the rake face 80 toward the second end 3A. The main body 2 may have an end face 2A located on the side of the second end 3A, or it may have a ridge line where the discharge groove 90 intersects with the end face 2A.

[0040] The cutting edge 11 may also have a transverse cutting edge 16 extending from the position of the rotation axis R1 (i.e., the position of the first end 10A) toward the outer periphery of the cutting portion 10, a grinding edge 17 extending from the transverse cutting edge 16 toward the outer periphery, and a main cutting edge 18 extending from the grinding edge 17 toward the outer periphery. The cutting portion 10 may also have a grinding surface 70 extending from the grinding edge 17 toward the second end 3A (the side of the second end 3A).

[0041] The rake face 80 extends from the main cutting edge 18 toward the second end 3A, causing the chips generated at the cutting edge 11 to bend. The chips, bent by the rake face 80, flow toward the discharge groove 90. The rake face 80 may also have a first face region 81, a second face region 82, a third face region 83, and a fourth face region 84.

[0042] like Figure 1 , 4As shown, the first surface region 81 can also be a surface that is connected to the main cutting edge 18 and has a gently curved shape corresponding to the shape of the edge on which the main cutting edge 18 is formed.

[0043] The second surface region 82 is connected to the first surface region 81 and is located closer to the second end 3A than the first surface region 81. It is also connected to the third surface region 83, the fourth surface region 84, and the discharge channel 90. The second surface region 82 is inclined relative to the first surface region 81. The boundary 12 between the second surface region 82 and the first surface region 81 can also extend inclined towards the second end 3A as it approaches the outer periphery of the main body 2 when viewed from the side.

[0044] Alternatively, the second surface region 82 can also be a surface with a gently downward convex curved shape (concave curve shape) in a section orthogonal to the rotation axis R1. The second surface region 82 can be a surface with a straight shape along the direction of the rotation axis R1, or it can be a surface with a gently downward convex curved shape.

[0045] The third surface region 83 is located closer to the second end 3A than the second surface region 82, and is adjacent to the side of the body 2 that is behind the discharge groove 90 in the rotation direction of the rotation axis R1 and close to the outer periphery of the body 2. In other words, the third surface region 83 is the portion surrounded by the second surface region 82, the discharge groove 90, and the edge line L1 located at the intersection of the rake face 80 and the outer peripheral surface of the body 2.

[0046] The third surface region 83 is inclined relative to the second surface region 82. In the side view of the main body 2, the boundary 23 between the second surface region 82 and the third surface region 83 extends through the end of the discharge groove 90 closest to the first end 10A and is orthogonal to the rotation axis R1. The third surface region 83 has a smaller rake angle than the second surface region 82, as detailed later. Therefore, the end of the chip generated by the cutting edge 11 in the width direction easily contacts the third surface region 83.

[0047] The fourth surface region 84 is located closer to the second end 3A than the second surface region 82, and is adjacent to the discharge groove 90 in the direction of rotation of the rotation axis R1. The fourth surface region 84 is inclined relative to the second surface region 82. The fourth surface region 84 is connected to the abutment surface 20, which, when the tool 1 is mounted on the tool holder 102 described later, is in contact with the fixing claw portion 105 of the tool holder 102 (see reference). Figure 12 The fourth surface region 84 is a curved surface with a shape that bends as it moves from the discharge groove 90 toward the abutment surface 20.

[0048] The discharge groove 90 is located closer to the second end 3A than the second surface region 82. The boundary between the discharge groove 90 and the rake face 80 is called the boundary 98. The discharge groove 90 can also be a spiral shape that tends toward the rear of the rotation direction R2 as it approaches the second end 3A. In this case, an edge is formed at the boundary between the discharge groove 90 and the rake face 80, and this edge is equivalent to the boundary 98. From the viewpoint of smoothly discharging the chips flowing from the rake face 80 toward the second end 3A, the discharge groove 90 can also be a concave curve shape in a section orthogonal to the rotation axis R1.

[0049] In tool 1 of this example, as Figures 5-7 As shown, the front angle of the first surface region 81 is set as the first front angle θ1, the front angle of the second surface region 82 is set as the second front angle θ2, and the front angle of the third surface region 83 is set as the third front angle θ3.

[0050] Here, the rake angle is a section that, in the main view, is orthogonal to the portion of the cutting edge 11 that is the object, and parallel to the axis of rotation R1 (e.g., Figure 2 Defined in the sections of lines VV, VI-VI, and VII-VII shown. And, for example, in... Figures 5-7 The cross-section shown can be defined by the angles formed by the imaginary line Y1 parallel to the rotation axis R1 and the first to fourth face regions 81 to 84 of the rake face 80. Specifically, the angle between the imaginary line Y1 and the first face region 81 is the first rake angle θ1, the angle between the imaginary line Y1 and the second face region 82 is the second rake angle θ2, and the angle between the imaginary line Y1 and the third face region 83 is the third rake angle θ3. Figures 5-7 In this example, the height position of the hypothetical line Y1 is appropriately altered to make it more feasible.

[0051] For example, in Figure 5 When the slope of the line in the first surface region 81 in the cross section is constant (the first front angle θ1 is constant), the value of the first front angle θ1 can be obtained based on the slope of the imaginary straight line Y1 passing through any point in the first surface region 81 and the slope of the first surface region 81 at that point.

[0052] On the other hand, Figure 5 In the cross-section shown, for example, the following situation may occur: the slope of the line in the first surface region 81 is not constant, and the angle between the line in the first surface region 81 and the imaginary line Y1 varies depending on the height position of the imaginary line Y1. In this case, the maximum value of the angles between the line in the first surface region 81 and the imaginary line Y1 that causes the height position of the imaginary line Y1 to change is the first front angle θ1.

[0053] The sizes of the front angles of the first surface region 81 to the third surface region 83 are compared in the same cross section. This is because, for example, in... Figures 5-7In each of the multiple cross sections shown, the absolute value of the first front angle θ1 may vary from one another.

[0054] exist Figures 5-7 In the cross-section shown, the value of the front angle is determined based on the imaginary line Y1. That is, in Figures 5-7 In the cross-section shown, the angle of the line parallel to the imaginary line Y1 is 0°. Furthermore, the acute angle between the line inclined clockwise relative to the imaginary line Y1 and the imaginary line Y1 is set to a positive value, and the acute angle between the line inclined counterclockwise relative to the imaginary line Y1 and the imaginary line Y1 is set to a negative value.

[0055] The definition of the anterior angle and the rules for comparing multiple anterior angles explained above are the same for the second anterior angle θ2 and the third anterior angle θ3.

[0056] In this example, for tool 1, the second rake angle θ2 is smaller than the first rake angle θ1, and the third rake angle θ3 is smaller than the second rake angle θ2. Here, "the third rake angle θ3 is smaller than the second rake angle θ2" also includes the case where the second rake angle θ2 is a positive value and the third rake angle θ3 is a negative value.

[0057] The angular difference between the first anterior angle θ1 and the second anterior angle θ2 can be, for example, about 1°, or it can be in the range of 0.3° or more and 10° or less. Similarly, the angular difference between the second anterior angle θ2 and the third anterior angle θ3 can be, for example, about 1°, or it can be in the range of 0.3° or more and 10° or less. About 1° means 1° ± 0.1°.

[0058] In this example, tool 1 achieves the following effect: when tool 1 rotates around the axis of rotation R1 and comes into contact with the workpiece, the cutting edge 11 cuts the workpiece, thereby forming chips of the workpiece along the cutting edge 11. Figure 4 and Figure 6 As shown, the chips from the central portion of the main cutting edge 18 toward the second end 3A travel from the first surface region 81 through the second surface region 82 toward the discharge groove 90.

[0059] Furthermore, the portion of the chip located near the outer periphery of the tool 1 travels in the order of the first surface region 81, the second surface region 82, and the third surface region 83. For example... Figure 7 As shown, by gradually decreasing the front angle from the first face region 81 to the third face region 83, the chips can be well rolled.

[0060] Here, on the rake face 80, the movement of the chip is braked, and the chip curls. On the other hand, in the discharge groove 90, the discharge groove 90 has a spiral shape that tends to move backward in the rotation direction R2 as it approaches the second end 3A, thereby making it easier for the chip to move smoothly compared to the rake face 80.

[0061] Furthermore, as described above, the third surface region 83 is adjacent to the discharge groove 90 on the side that is behind the rotation direction of the rotation axis R1 and close to the outer periphery of the main body 2. Therefore, in this example of the tool 1, some chips near the outer periphery of the tool 1 tend to twist. Thus, it is possible to prevent chips from flying out of the tool 1 and to facilitate the flow of chips towards the discharge groove 90.

[0062] In particular, in the tool 1 of this example, the second rake angle θ2 is smaller than the first rake angle θ1, and the third rake angle θ3 is smaller than the second rake angle θ2. Therefore, the angle formed by the third surface region 83 and the discharge groove 90 tends to become larger, and the chips near the outer periphery of the tool 1 tend to be further distorted.

[0063] The cutting tool 1 in this example can also be referred to as having the following structure.

[0064] The main body 2 has a rake face 80 extending from the cutting edge 11 toward the second end 3A and a discharge groove 90 extending from the rake face 80 toward the second end 3A. The area of ​​the discharge groove 90 on the side of the first end 10A is convex toward the rake face 80. Therefore, the boundary 98 between the rake face 80 and the discharge groove 90 is convex toward the first end 10A (on the side of the first end 10A).

[0065] Furthermore, the rake angle of the rake face 80 decreases as it moves away from the cutting edge 11. Therefore, the rake angle of the region (third face region 83) between the discharge groove 90 and the edge line L1 on the rake face is smaller than the rake angle of the region (first face region 81 and second face region 82) on the rake face that is closer to the first end 10A than the discharge groove 90.

[0066] Additionally, the main body 2 may also have an abutment surface 20. The abutment surface 20 may also be located in front of the discharge groove 90 in the rotation direction R2 and abut against the tool holder 102 when the tool 1 is mounted on the tool holder 102 described later. The rake angle of the area (fourth surface region 84) in the rake face that is sandwiched between the discharge groove 90 and the abutment surface 20 may also be smaller than the rake angle of the area (first surface region 81 and second surface region 82) in the rake face that is closer to the first end 10A than the discharge groove 90.

[0067] Alternatively, the cutting tool 1 may have a shape in which the boundary 98 between the rake face 80 and the discharge groove 90, viewed from the side, protrudes towards the first end 10A. That is, the boundary 98 may also protrude towards the first end 10A (the side of the first end 10A). The portion of the discharge groove 90 that protrudes towards the first end 10A is called the protruding groove portion 91. With this structure, the distance from the main cutting edge 18 to the discharge groove 90 can be shortened. Therefore, chips flowing in the boundary portion between the second surface region 82 and the discharge groove 90 in the boundary 98 (in other words, chips flowing between the third surface region 83 and the fourth surface region 84) can easily flow towards the discharge groove 90.

[0068] Additionally, in tool 1, the third face region 83 and the fourth face region 84 may also have a cross section that is orthogonal to the rotation axis R1 and intersects with the discharge groove 90, the third face region 83, and the fourth face region 84 (e.g., Figure 9 The width W4 of the fourth surface region 84 in the cross-section shown is greater than the width W3 of the third surface region 83. Here, the width W4 of the fourth surface region 84 is the length of the straight line connecting the two ends of the fourth surface region 84 in the cross-sectional view (the two ends of the curve corresponding to the surface of the fourth surface region 84 in the cross-sectional drawing). The width W3 of the third surface region 83 is the length of the straight line connecting the two ends of the third surface region 83 in the cross-sectional view (the two ends of the curve corresponding to the surface of the third surface region 83 in the cross-sectional drawing) (refer to...). Figure 9 , 10 ).

[0069] By configuring the structure in this way, chip removal is improved. When chips flow from the rake face 80 to the discharge groove 90, they tend to flow towards the rear side of the rake face 80 and the discharge groove 90 in the rotational direction R2. At this time, the discharge groove 90 is positioned towards the rear side of the rake face 80 and the discharge groove 90 in the rotational direction R2, so chips tend to flow towards the discharge groove 90.

[0070] like Figure 9 As shown, the discharge groove 90 can also be recessed relative to the rake face 80 at the boundary 98 between the rake face 80 and the discharge groove 90. With this structure, the chips are less likely to come into strong contact with the discharge groove 90 as they flow from the rake face 80 to the discharge groove 90. Therefore, wear on the discharge groove 90 is easily avoided, and chip removal is improved.

[0071] Tool 1 can also be a first section (e.g., perpendicular to the rotation axis R1 and intersecting the rake face 80) at which the tool is perpendicular to the rotation axis R1 and intersects the rake face 80. Figure 8 In the cross-section shown, the rake face 80 is a concave curve shape, and in the second cross-section (e.g., the cross-section that is orthogonal to the rotation axis R1 and intersects with the discharge groove 90) Figure 9In the cross-section shown, the discharge groove 90 is a concave curve shape. Furthermore, the radius of curvature RC2 of the discharge groove 90 in the second cross-section can also be smaller than the radius of curvature RC1 of the rake face 80 in the first cross-section. In other words, the radius of curvature RC2 of the discharge groove 90 in the second cross-section can also be smaller than the radius of curvature RC1 of the second surface region 82 in the first cross-section.

[0072] By configuring the structure in this way, the contact area between the chip and the discharge groove 90 is easily reduced as the chip flows from the rake face 80 to the discharge groove 90. Specifically, as the chip flows from the rake face 80 to the discharge groove 90, at least a portion of the chip easily leaves the discharge groove 90 and flows away. Therefore, wear on the discharge groove 90 is easily avoided, and chip removal is improved.

[0073] In other words, the cutting tool 1 in this example can also have the following structure.

[0074] The main body 2 has a rake face 80 extending from the cutting edge 11 toward the second end 3A and a discharge groove 90 extending from the rake face 80 toward the second end 3A. The area of ​​the discharge groove 90 on the side of the first end 10A is convex toward the rake face 80. Therefore, the boundary 98 between the rake face 80 and the discharge groove 90 is convex toward the first end 10A.

[0075] Furthermore, the rake angle of the rake face 80 decreases as it moves away from the cutting edge 11. Therefore, the rake angle of the region (third face region 83) in the rake face, which is sandwiched between the discharge groove 90 and the edge line L1, is smaller than the rake angle of the region (first face region 81 and second face region 82) in the rake face that is closer to the first end 10A than the discharge groove 90.

[0076] Additionally, the main body 2 may also have an abutment surface 20. The abutment surface 20 may also be located in front of the discharge groove 90 in the rotation direction R2 and abut against the tool holder 102 when the tool 1 is mounted on the tool holder 102 described later. The rake angle of the area (fourth surface region 84) in the rake face that is sandwiched between the discharge groove 90 and the abutment surface 20 may also be smaller than the rake angle of the area (first surface region 81 and second surface region 82) in the rake face that is closer to the first end 10A than the discharge groove 90.

[0077] (4. Regarding the surface area possessed by the rake face)

[0078] Whether the front face 80 has a first face region 81, a second face region 82, and a third face region 83 can also be evaluated through the following steps.

[0079] First, such as Figure 7As shown in the sectional view, this section is a cross-section of the tool 1 viewed from the first end 10A side, perpendicular to the cutting edge 11, parallel to the rotation axis R1, and passing through the portion of the rake face 80 sandwiched between the discharge groove 90 and the ridge line L1. In this section, the portion of the rake face 80 located on the first end 10A side and connected to the cutting edge 11 is defined as the first surface region 81. Furthermore, the rake angle at the portion of the first surface region 81 connected to the cutting edge 11 is defined as the first rake angle θ1.

[0080] Next, in the aforementioned cross-section, the portion of the rake face 80 located on the side of the second end 3A and sandwiched between the discharge groove 90 and the edge line L1 is designated as the third surface region 83. Furthermore, the rake angle of the portion of this third surface region 83 that connects to the discharge groove 90 is designated as the third rake angle θ3.

[0081] Alternatively, if there exists a surface region between the first surface region 81 and the third surface region 83 that has a front angle smaller than the first front angle θ1 and larger than the third front angle θ3, then that surface region can be regarded as the second surface region 82.

[0082] In addition, the following steps can be used to evaluate whether the front face 80 has a first face region 81, a second face region 82, and a fourth face region 84.

[0083] First, such as Figure 5 As shown in the cross-sectional view, this section is a portion of the rake face 80 that is orthogonal to the cutting edge 11, parallel to the rotation axis R1, and passing through the portion sandwiched between the discharge groove 90 and the abutment surface 20 when the tool 1 is viewed from the first end 10A. In this section, the portion of the rake face 80 located on the first end 10A side and connected to the cutting edge 11 is designated as the first surface region 81. Furthermore, the rake angle at the portion of the first surface region 81 connected to the cutting edge 11 is designated as the first rake angle θ1. Next, in the aforementioned section, the portion of the rake face 80 located on the second end 3A side and sandwiched between the discharge groove 90 and the abutment surface 20 is designated as the fourth surface region 84.

[0084] Alternatively, if there exists a surface region with a smaller front angle than the first front angle θ1 between the first surface region 81 and the fourth surface region 84, that surface region can be regarded as the second surface region 82.

[0085] (4. Structure of the rotating tool)

[0086] Next, regarding the rotating tool 100 in one example of the non-limiting disclosure, using... Figure 11 , 12 Let me explain. Figure 11 This is a three-dimensional view representing the rotation tool 100. Figure 12This is an enlarged view of the front end portion on the first end 10A side, magnified using the rotation tool 100.

[0087] like Figure 11 , 12 As shown, in one example, the rotary tool 100 is a so-called tool-clamping type drilling machine in which the cutting tool 1 and the tool holder 102 are formed as separate parts, and the cutting tool 1 is mounted on the front end of the tool holder 102. The rotary tool 100 has a rotation axis R1 and rotates around the rotation axis R1.

[0088] In this example, the rotary tool 100 is a single-cutter type drilling machine equipped with one tool 1, but rotary tools equipped with tool 1 are not limited to single-cutter type drilling machines. Furthermore, the rotary tool is not limited to a drilling machine that moves along the direction of the rotation axis R1 to perform hole cutting on the workpiece; it can also be a tool capable of rotary cutting the workpiece while rotating and moving in any direction. Examples of rotary tools equipped with tool 1 include end mills and milling tools.

[0089] The tool holder 102 may also have a shank 103 and a body 104 extending along the rotation axis R1. The shank 103 may also be a bar shape extending along the rotation axis R1, for example, a part held by a machine tool.

[0090] The main body 104 has a spiral-shaped discharge groove 110 on its side for discharging chips from the workpiece T.

[0091] Additionally, the main body 104 has a slot 111 with an opening at the front end, into which the shaft portion 3 of the tool 1 is mounted. The tool 1 is assembled to the tool holder 102 (main body 104) by, for example, a screw (not shown in the figure).

[0092] The main body 104 has a retaining claw 105 at its front end on the side of the cutter 1, which can fix the cutter 1. One of the multiple surfaces of the retaining claw 105 abuts against the contact surface 20 of the cutter 1. The discharge groove 110 is connected to the discharge groove 90 of the cutter 1.

[0093] <Methods for Manufacturing Machined Workpieces>

[0094] Next, use Figure 13 Let's illustrate a method for manufacturing a workpiece that has undergone machining in an example. Figure 13 This is a simplified diagram illustrating the steps of a method for manufacturing a machined object according to one embodiment. Hereinafter, a method for manufacturing a machined object U by cutting a workpiece T using a rotary tool 100 will be described.

[0095] The method for manufacturing the machined workpiece U in one embodiment may also include the following steps. That is, it may also include:

[0096] (1) The process of rotating the rotating tool 100;

[0097] (2) The process of bringing the rotating tool 100 into contact with the workpiece T; and

[0098] (3) The process of moving the rotating tool 100 away from the material T being cut.

[0099] More specifically, firstly, such as Figure 13 As shown in the figure with reference numeral 1301, the workpiece T is prepared directly below the rotary tool 100, and the rotary tool 100 mounted on the machine tool rotates around the rotation axis R1. Examples of workpiece T include aluminum, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0100] Next, as Figure 13 As shown in the figure with reference numeral 1302, the rotating tool 100 is brought close to the workpiece T, and the rotating tool 100 comes into contact with the workpiece T. As a result, the workpiece T is cut by the cutting edge 11 of the tool 1, forming a machined hole V. The chips from the cut workpiece T are discharged from the discharge groove 90 of the tool 1 through the discharge groove 110 of the tool holder 102 and outwards. The method of bringing the rotating tool 100 close to the workpiece T is not particularly limited. For example, the rotating tool 100 can be moved toward the fixed workpiece T, or the workpiece T can be moved relative to the fixed rotating tool 100.

[0101] Next, as Figure 13 As shown in the figure with reference numeral 1303, the rotating tool 100 is moved away from the workpiece T. Thus, the workpiece T that forms the machining hole V, i.e., the machined workpiece U, is created.

[0102] <Variation Example>

[0103] (a) In the above embodiment, a so-called tool clamping type rotary tool 100 is described, which is formed by combining the tool 1 and the tool holder 102. However, the structure of the rotary tool 100 is not limited to this, and of course, it can also be a so-called integrally fixed type rotary tool in which the tool 1 and the tool holder 102 are integrally formed.

[0104] (b) Regarding the tool 1, in the rake face 80, the boundaries of adjacent regions in the first face region 81 to the fourth face region 84 may be clearly distinguishable or the boundaries may be indistinct. That is, the tool 1 may not have clear boundaries 12 and 23.

[0105] [Additional Notes]

[0106] The invention disclosed above has been described based on the accompanying drawings and embodiments. However, the invention disclosed herein is not limited to the embodiments described above. That is, various modifications can be made to the invention within the scope shown in this disclosure, and embodiments obtained by appropriately combining the techniques disclosed in different embodiments are also included in the technical scope of this disclosure. It should be noted that those skilled in the art can easily make various modifications or alterations based on this disclosure. Furthermore, it should be understood that these modifications or alterations are included within the scope of this disclosure.

[0107] Explanation of reference numerals in the attached figures

[0108] 1 knife

[0109] 2 main bodies

[0110] 3-axis section

[0111] 10 Cutting section

[0112] 11 Cutting edge

[0113] 16 chisel blade

[0114] 17. Sharpening the blade

[0115] 18 main cutting edges

[0116] 20 contact surfaces

[0117] 70-grind surface

[0118] 80 rake face

[0119] 81 First Area

[0120] 82 Second side area

[0121] 83 Third side area

[0122] 84 Fourth Area

[0123] 90, 110 discharge trough

[0124] 91 protruding groove

[0125] 12, 23, 98 boundary

[0126] 100 Rotation Tool

[0127] 102 handle

[0128] 103 handle

[0129] 104 main body

[0130] 105 Fixed Claw Section

[0131] 111 card slot

[0132] RC1 and RC2 radii of curvature

[0133] θ1 First Anterior Angle

[0134] θ2 second anterior angle

[0135] θ3 third anterior angle

[0136] R1 Rotary Axis

[0137] R2 arrow (direction of rotation)

[0138] Y1 is an imaginary straight line.

Claims

1. A cutting tool, wherein the cutting tool has a main body extending along a rotation axis from a first end toward a second end, the main body has: a cutting edge on the first end side; a rake face extending from the cutting edge toward the second end; and a discharge groove extending from the rake face toward the second end, the rake face has: a first face region connected to the cutting edge and having a first rake angle; a second face region located closer to the second end than the first face region and having a second rake angle; and a third face region located closer to the second end than the second face region and having a third rake angle, the discharge groove is located closer to the second end than the second face region, the third face region is adjacent to the outer periphery of the main body on the rotation direction of the rotation axis behind the discharge groove, the second rake angle is smaller than the first rake angle, and the third rake angle is smaller than the second rake angle.

2. The cutting tool according to claim 1, wherein at a boundary of the rake face and the discharge groove, the discharge groove is recessed with respect to the rake face.

3. The cutting tool according to claim 1 or 2, wherein in a side view, the boundary of the rake face and the discharge groove is convex toward the first end.

4. The cutting tool according to claim 1 or 2, wherein the rake face further has a fourth face region located closer to the second end than the second face region and adjacent to the discharge groove in front of the rotation direction of the rotation axis, the third face region and the fourth face region have a portion in which a width of the fourth face region is larger than a width of the third face region in a cross section orthogonal to the rotation axis and intersecting the discharge groove, the third face region, and the fourth face region.

5. The cutting tool according to claim 1 or 2, wherein in a first cross section orthogonal to the rotation axis and intersecting the rake face, the rake face is a concave curved shape, in a second cross section orthogonal to the rotation axis and intersecting the discharge groove, the discharge groove is a concave curved shape, a radius of curvature of the discharge groove in the second cross section is smaller than a radius of curvature of the rake face in the first cross section.

6. A rotary tool, wherein the rotary tool has: a shank having a clamping groove on a front end side; and the cutting tool according to any one of claims 1 to 5 in the clamping groove.

7. A method of manufacturing a cutting workpiece, wherein the method of manufacturing the cutting workpiece includes: a step of rotating the rotary tool according to claim 6; a step of bringing the rotating rotary tool into contact with a workpiece; and a step of separating the rotary tool from the workpiece. ​ ​

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