WO2025063046A1 - 切削インサート、切削工具、及び切削加工物の製造方法 - Google Patents

切削インサート、切削工具、及び切削加工物の製造方法 Download PDF

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Publication number
WO2025063046A1
WO2025063046A1 PCT/JP2024/031812 JP2024031812W WO2025063046A1 WO 2025063046 A1 WO2025063046 A1 WO 2025063046A1 JP 2024031812 W JP2024031812 W JP 2024031812W WO 2025063046 A1 WO2025063046 A1 WO 2025063046A1
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Prior art keywords
tip
cutting
inclination angle
connection surface
connection
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Pending
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PCT/JP2024/031812
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English (en)
French (fr)
Japanese (ja)
Inventor
善弘 井上
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Kyocera Corp
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Kyocera Corp
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Publication date
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Priority to CN202480045469.9A priority Critical patent/CN121866125A/zh
Priority to JP2025547323A priority patent/JPWO2025063046A1/ja
Publication of WO2025063046A1 publication Critical patent/WO2025063046A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/04—Cutting-off tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material

Definitions

  • the present disclosure relates to a cutting insert and a cutting tool used in cutting a workpiece, and a method for manufacturing a cut product.
  • cutting include turning and milling.
  • turning include internal diameter machining, external diameter machining, grooving, and cut-off.
  • Cutting tools used in cutting workpieces include those described in Japanese Patent Application Laid-Open No. 8-229705 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2009-012117 (Patent Document 2).
  • the cutting tools described in Patent Documents 1 and 2 have a holder and a cutting insert (hereinafter simply referred to as "insert").
  • an insert is a rod-shaped insert extending along a central axis, having a main body portion located in the center in the direction along the central axis, and a pair of cutting portions located at both ends in the direction along the central axis.
  • the end faces of the pair of cutting parts each have a clearance surface area and a restraining surface area.
  • the restraining surface area of the other of the pair of cutting parts can be used for restraining it to the holder.
  • the flank area and the constraint surface area are likely to have a twisted relationship.
  • the constraint surface area is set to match the portion of the flank area that is close to the main body.
  • the portion of the tip cutting edge that is far from the main body protrudes significantly from the constraint surface area.
  • This disclosure was made in consideration of the above problems, and aims to provide an insert with excellent durability.
  • the non-limiting one-sided cutting insert of the present disclosure is rod-shaped extending along a central axis from a tip to a rear end.
  • the cutting insert has a body portion located in the center in a direction along the central axis, a first cutting portion located closer to the tip than the body portion, and a second cutting portion located closer to the rear end than the body portion.
  • the first cutting portion has a tip surface located on the tip side, an upper surface extending from the tip surface toward the body portion, a first side surface extending from the tip surface toward the body portion, a second side surface extending from the tip surface toward the body portion and located on the opposite side to the first side surface, and a tip cutting edge located at the intersection of the tip surface and the upper surface.
  • the tip blade has a first end located on the side of the first side surface and a second end located on the side of the second side surface and closer to the main body than the first end.
  • the tip surface has a clearance surface located along the tip blade, a restraining surface located below the clearance surface, and a connecting surface located between the clearance surface and the restraining surface and inclined relative to the clearance surface and the restraining surface.
  • the connecting surface has a first connecting surface located below the first end surface and a second connecting surface located below the second end surface. The inclination angle of the first connecting surface is greater than the inclination angle of the clearance surface.
  • the inclination angle of the second connecting surface is smaller than the inclination angle of the clearance surface.
  • FIG. 2 is a perspective view of a non-limiting one-sided cutting insert of the present disclosure.
  • FIG. 2 is an enlarged view of a region II shown in FIG. 1 .
  • 2 is a perspective view of the cutting insert shown in FIG. 1 as viewed from a different direction, and is an enlarged view of the tip side.
  • FIG. FIG. 2 is a plan view of the upper surface of the cutting insert shown in FIG. 1 as viewed from the front.
  • FIG. 5 is an enlarged view of a region V shown in FIG. 4 .
  • 6 is a side view of the cutting insert shown in FIG. 4 as viewed from a direction VI.
  • FIG. 7 is a plan view of the cutting insert shown in FIG. 4 as viewed from a VII direction.
  • FIG. 8 is the same plan view as FIG. FIG.
  • FIG. 9 is a cross-sectional view of the cutting insert shown in FIG. 8 taken along line IX.
  • FIG. 10 is a cross-sectional view of the cutting insert shown in FIG. 8 taken along line XI.
  • FIG. 1 is a perspective view of a non-limiting one-sided cutting tool of the present disclosure.
  • FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure.
  • FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure.
  • FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure.
  • FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure.
  • FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure.
  • the non-limiting one-sided cutting insert 1 (hereinafter, simply referred to as "insert 1") of the present disclosure will be described in detail with reference to the drawings.
  • the insert 1 may include any component member not shown in each of the drawings referred to.
  • the dimensions of the components in each drawing do not faithfully represent the dimensions of the actual components and the dimensional ratios of each component.
  • the insert 1 may be rod-shaped extending along the central axis O1 from the front end 1a to the rear end 1b, as in the non-limiting example shown in Figures 1 to 12.
  • the insert 1 may be prismatic.
  • the insert 1 may be rectangular prism-shaped. Note that the rectangular prism shape may be roughly rectangular prism-shaped, and does not have to be rectangular prism-shaped in the strict sense.
  • the insert 1 may have a body portion 3, a first cutting portion 5, and a second cutting portion 7, as shown in the non-limiting example in Figures 1, 4, and 6.
  • the main body portion 3 may be located at the center of the insert 1 in the direction along the central axis O1.
  • the main body portion 3 may function as a part that is fixed to the holder when the insert 1 is attached to the holder.
  • the first cutting portion 5 may be located closer to the tip 1a than the main body portion 3.
  • the second cutting portion 7 may be located closer to the rear end 1b than the main body portion 3.
  • the first cutting portion 5 and the second cutting portion 7 are capable of contacting the workpiece and can function as parts that play a major role in cutting the workpiece (e.g., cut-off).
  • the other of the first cutting portion 5 and the second cutting portion 7 can be used to restrain the workpiece from the holder.
  • the second cutting unit 7 may have the same configuration as the first cutting unit 5. Therefore, the description of the first cutting unit 5 may be used to understand the configuration of the second cutting unit 7.
  • the first cutting portion 5 may have a tip surface 9, an upper surface 11, a first side surface 13, a second side surface 15, and a tip cutting edge 17, as shown in a non-limiting example in Figures 2 and 3.
  • the tip surface 9 may be located on the side of the tip 1a.
  • the upper surface 11 may extend from the tip surface 9 toward the main body portion 3.
  • the upper surface 11 is a convenient expression and does not indicate an upward direction.
  • the upper surface 11 does not need to face upward when the insert 1 is in use. This is the same for other parts that include the expressions "up” and "down.”
  • the positional relationship in the up-down direction may be specified by defining the direction perpendicular to the central axis O1 from the central axis O1 toward the upper surface 11 as "upward” and the direction from the upper surface 11 toward the central axis O1 as "downward.”
  • the first side surface 13 may extend from the tip surface 9 toward the main body portion 3.
  • the second side surface 15 may extend from the tip surface 9 toward the main body portion 3.
  • the second side surface 15 may be located on the opposite side of the first side surface 13.
  • the tip edge 17 may be located at the intersection of the tip surface 9 and the top surface 11.
  • the tip edge 17 may be located at the entire intersection, or may be located at only a portion of the intersection.
  • the tip edge 17 can be used to cut a workpiece when manufacturing a machined product using the insert 1.
  • the tip edge 17 may also be generally referred to as a leading cutting edge or a main cutting edge.
  • the tip blade 17 may have a straight line shape or a curved line shape when viewed from the tip or from the top.
  • the tip blade 17 may have a shape that combines straight lines and curved lines when viewed from the tip or from the top.
  • the tip blade 17 may have a concave curved line shape when viewed from the tip.
  • the tip blade 17 may have a concave curved line shape when viewed from the top.
  • the tip view may refer to the state when viewed from the tip 1a side.
  • the top view may refer to the state when viewed from the top surface 11 side.
  • the tip blade 17 may have a first end 17a and a second end 17b, as in the non-limiting example shown in FIG. 5.
  • the first end 17a may be located on the side of the first side surface 13.
  • the second end 17b may be located on the side of the second side surface 15.
  • the second end 17b may be located closer to the main body portion 3 than the first end 17a. In these cases, the tip blade 17 is likely to be inclined with respect to the central axis O1.
  • the first end 17a may be located closer to the first side surface 13 than the central axis O1.
  • the second end 17b may be located closer to the second side surface 15 than the central axis O1.
  • the first end 17a is not limited to the end point on the side of the first side 13 of the tip blade 17. As shown in the non-limiting example of FIG. 5, the first end 17a may refer to a region having a width on the side of the first side 13. Similarly, the second end 17b is not limited to the end point on the side of the second side 15 of the tip blade 17. As shown in the non-limiting example of FIG. 5, the second end 17b may refer to a region having a width on the side of the second side 15.
  • the tip surface 9 may have a clearance surface 19, a restraint surface 21, and a connection surface 23, as shown in a non-limiting example in FIG. 7.
  • the flank 19 may be located along the leading edge 17.
  • the flank 19 may function as a portion that avoids contact with the workpiece and reduces cutting resistance.
  • the flank 19 may be connected to the leading edge 17.
  • the flank 19 may be flat, as shown in a non-limiting example in FIG. 2. Flat does not have to be flat in the strict sense.
  • the flank 19 only needs to be generally flat, and may be slightly curved or have slight irregularities that are not noticeable when the insert 1 is viewed as a whole. For example, the flank 19 may have slight irregularities of about several tens of ⁇ m.
  • the restraining surface 21 may be located below the flank surface 19.
  • the restraining surface 21 may mean that it can be used as a surface that is restrained by the holder when the insert 1 is attached to the holder. In other words, the restraining surface 21 is not necessarily a surface that is restrained by the holder when the first cutting portion 5 is in use.
  • the restraining surface 21 may be flat, as in the non-limiting example shown in FIG. 2. Flat does not necessarily mean flat in the strict sense.
  • the restraining surface 21 may be generally flat, like the flank surface 19. In the non-limiting example shown in FIG. 2, the flat flank surface 19 is in a twisted relationship with respect to the flat restraining surface 21.
  • connection surface 23 may be located between the clearance surface 19 and the constraint surface 21.
  • the connection surface 23 may be inclined with respect to the clearance surface 19 and the constraint surface 21, as shown in the non-limiting example in FIG. 9 and FIG. 11.
  • the connection surface 23 may be connected to the clearance surface 19 and the constraint surface 21, respectively.
  • connection surface 23 may have a first connection surface 25 and a second connection surface 27, as shown in a non-limiting example in FIG. 7.
  • the first connection surface 25 may be located below the first end 17a.
  • the second connection surface 27 may be located below the second end 17b.
  • first connection surface 25 being located below the first end 17a may mean that the first connection surface 25 appears in a cross section passing through the first end 17a and along the central axis O1, as in the non-limiting example shown in FIG. 9.
  • the second connection surface 27 being located below the second end 17b may mean that the second connection surface 27 appears in a cross section passing through the second end 17b and along the central axis O1, as in the non-limiting example shown in FIG. 11.
  • the inclination angle ⁇ 25 of the first connection surface 25 may be larger than the inclination angle ⁇ 19 of the clearance surface 19, as in the non-limiting example shown in FIG. 10.
  • the inclination angle ⁇ 27 of the second connection surface 27 may be smaller than the inclination angle ⁇ 19 of the clearance surface 19, as in the non-limiting example shown in FIG. 12.
  • FIGS. 10 and 12 may each be a cross section parallel to the central axis O1 and along the up-down direction.
  • FIGS. 10 and 12 may be parallel to a virtual plane that is equidistant from a pair of side surfaces in the main body 3.
  • the inclination angles ⁇ 19, ⁇ 25, and ⁇ 27 of the clearance surface 19, the first connection surface 25, and the second connection surface 27 can be evaluated as follows. First, in the cross sections shown in Figures 10 and 12, an imaginary straight line L1 perpendicular to the central axis O1 is set. The angles that the clearance surface 19, the first connection surface 25, and the second connection surface 27 make with respect to this imaginary straight line L1 correspond to the inclination angles ⁇ 19, ⁇ 25, and ⁇ 27 described above.
  • the inclination angle ⁇ 19 is a positive value
  • the flank 19 is inclined so that it moves away from the main body 3 as it moves away from the cutting edge 17
  • the inclination angle ⁇ 19 is a negative value.
  • the first connection surface 25 and the second connection surface 27 it can be evaluated whether the inclination angles ⁇ 25, ⁇ 27 are positive or negative depending on the inclination direction of these surfaces.
  • the angle between this line and the above-mentioned imaginary line L1 can be evaluated as the inclination angle ⁇ 19.
  • the angle between this line and the above-mentioned imaginary line L1 can be evaluated as the inclination angle ⁇ 25.
  • the inclination angle 27 of the second connection surface 27 can be evaluated in the same manner.
  • connection surface 23 has the above-mentioned two-surface configuration (first connection surface 25 and second connection surface 27)
  • the position of the restraint surface 21 is set so that it is located closer to the rear end 1b than the area of the flank 19 that protrudes most toward the tip 1a, and is located closer to the tip 1a than the area of the flank 19 that is most recessed toward the rear end 1b, and it is possible to connect the flank 19 and the restraint surface 21 in such a positional relationship with the connection surface 23. Therefore, it is easy to avoid a configuration in which the first end 17a, which protrudes most toward the tip 1a of the tip cutting edge 17, protrudes significantly from the restraint surface 21. This makes it easy to ensure the thickness of the first end 17a of the tip cutting edge 17, and the strength of the first end 17a is high. Therefore, the insert 1 has excellent durability.
  • the constraint surface 21, which is located farther from the cutting edge 17 than the clearance surface 19, is more likely to be distant from the workpiece than the clearance surface 19 due to the cylindrical shape of the workpiece. Therefore, even below the second end 17b of the cutting edge 17, which is the part of the cutting edge 17 that is pulled down the most toward the rear end 1b, it is easy to avoid the constraint surface 21 coming into contact with the workpiece.
  • the inclination angle ⁇ 25 of the first connection surface 25 may be greater than the inclination angle ⁇ 21 of the restraint surface 21, as in the non-limiting example shown in FIG. 10.
  • the inclination angle ⁇ 27 of the second connection surface 27 may be less than the inclination angle ⁇ 21 of the restraint surface 21, as in the non-limiting example shown in FIG. 12. In these cases, it is easy to avoid the restraint surface 21 being pulled too far down toward the rear end 1b. Therefore, the insert 1 is easy to be held stably in the holder.
  • the inclination angle is not limited to a specific value.
  • the inclination angle ⁇ 25 of the first connection surface 25 may be set to 10 to 45°.
  • the inclination angle ⁇ 27 of the second connection surface 27 may be set to 0 to 5°.
  • the inclination angle ⁇ 19 of the clearance surface 19 may be set to 3 to 10°.
  • the inclination angle ⁇ 21 of the restraint surface 21 may be set to 1 to 10°.
  • the inclination angle ⁇ 25 of the first connection surface 25 may be greater than the inclination angle ⁇ 27 of the second connection surface 27.
  • the width W25 of the first connection surface 25 in the height direction Y1 may increase as it approaches the first side surface 13. In this case, the inclination of the restraining surface 21 with respect to the central axis O1 is easily suppressed. This increases the restraint stability of the insert 1 in the holder.
  • the height direction Y1 may refer to the up-down direction of the insert 1.
  • the width W27 of the second connection surface 27 in the height direction Y1 may increase as it approaches the second side surface 15. In this case, the inclination of the restraint surface 21 with respect to the central axis O1 is easily suppressed. This increases the restraint stability of the insert 1 in the holder.
  • the maximum value of the width W27 in the height direction Y1 at the second connection surface 27 may be greater than the maximum value of the width W25 in the height direction Y1 at the first connection surface 25, as in a non-limiting example shown in FIG. 7. In this case, it is easier to increase the inclination angle ⁇ 25 of the first connection surface 25 and to decrease the inclination angle ⁇ 27 of the second connection surface 27. This makes it easier for the insert 1 to be stably held in the holder. In particular, when the relief surface 19 and the restraint surface 21 are flat, it is easier to increase the inclination angle ⁇ 25 of the first connection surface 25 and to decrease the inclination angle ⁇ 27 of the second connection surface 27.
  • the first connection surface 25 may have a curved shape, as shown in the non-limiting example in Figures 2, 3, and 9.
  • the first connection surface 25 may have a first region 29 and a second region 31.
  • the first region 29 may have a convex curved shape located along the relief surface 19.
  • the second region 31 may have a concave curved shape located along the restraining surface 21.
  • the second region 31 may be connected to the first region 29.
  • a tangent line may be set at the boundary between the first region 29 and the second region 31, and the inclination angle ⁇ 25 of the first connection surface 25 may be determined by the angle of this tangent line relative to the virtual straight line L1.
  • the second connection surface 27 may have a flat area 33, as shown in the non-limiting example in Figures 2, 3, and 11.
  • the flat area 33 may be a flat surface area. Flat does not have to be flat in the strict sense.
  • the flat area 33 only needs to be generally flat, and may be slightly curved or have slight irregularities that are not noticeable when the insert 1 is viewed as a whole. For example, the flat area 33 may have slight irregularities of about several tens of micrometers.
  • the flat area 33 may have a smaller inclination angle than the clearance surface 19 and the restraining surface 21, as in the non-limiting example shown in Figures 11 and 12.
  • the portion of the flat area 33 that is restrained by the holder and does not contact the holder restraining surface tends to be wider.
  • a wider surface area of the flat area 33 is pressed by the holder, which tends to improve cutting stability.
  • the inclination angle ⁇ 27 of the second connection surface 27 may be determined by the angle of the flat area 33 with respect to the virtual straight line L1.
  • the flat area 33 may be the largest area on the second connection surface 27.
  • the upper end 25a of the first connection surface 25 may be located higher than the upper end 27a of the second connection surface 27, as in the non-limiting example shown in FIG. 7. In this case, it is easy to ensure a large area for each of the clearance surface 19 and the restraint surface 21 while maintaining the area of the connection surface 23.
  • the upper end may mean the part located at the top in the part to be evaluated.
  • the lower end 25b of the first connection surface 25 may be located above the lower end 27b of the second connection surface 27, as in a non-limiting example shown in FIG. 7. In this case, it is easy to ensure a large area for each of the clearance surface 19 and the restraint surface 21 while maintaining the area of the connection surface 23.
  • the lower end may mean the part located lowest in the part to be evaluated.
  • the second connection surface 27 may be connected to the first connection surface 25.
  • the area of the first connection surface 25 and the second connection surface 27 is likely to be large. Therefore, the effect of the connection surface 23 having the first connection surface 25 and the effect of the connection surface 23 having the second connection surface 27 can be further enhanced.
  • the first connection surface 25 and the second connection surface 27 may be smoothly connected.
  • being smoothly connected may mean that no ridge line that can be visually distinguished is formed at the above-mentioned boundary.
  • the end 27c on the side of the first side 13 of the second connection surface 27 may be located higher than the end 25c on the side of the second side 15 of the first connection surface 25. Also, the end 27c on the second connection surface 27 may be located closer to the first side 13 than the end 25c on the first connection surface 25. In these cases, the area including the end 27c on the second connection surface 27 is likely to be located across the first connection surface 25. As a result, the area of the first connection surface 25 can be reduced while maintaining the area of the restraint surface 21, making it easier to maintain the strength of the insert 1.
  • the end 33a on the side of the first side 13 in the flat region 33 of the second connection surface 27 may be located higher than the end 25c on the side of the second side 15 in the first connection surface 25.
  • the end 33a in the flat region 33 may be located closer to the first side 13 than the end 25c in the first connection surface 25.
  • the region including the end 33a in the flat region 33 is likely to be located across the first connection surface 25.
  • the area of the first connection surface 25 can be reduced while ensuring the area of the restraint surface 21, making it easier to maintain the strength of the insert 1.
  • the area of the second connection surface 27 may be larger than the area of the first connection surface 25, as shown in a non-limiting example in FIG. 7.
  • the insert 1 is not limited to a specific size.
  • the length of the insert 1 in the direction along the central axis O1 may be set to approximately 5 to 80 mm.
  • the width of the insert 1 in the direction perpendicular to the central axis O1 when viewed from above may be set to approximately 2 to 20 mm.
  • the height of the insert 1 in the direction perpendicular to the central axis O1 when viewed from the tip may be set to approximately 2 to 15 mm.
  • the material of the insert 1 may be, for example, a cemented carbide or a cermet.
  • the composition of the cemented carbide may be, for example, WC-Co, WC-TiC-Co, or WC-TiC-TaC-Co.
  • WC, TiC, and TaC may be hard particles
  • Co may be a binder phase.
  • the cermet may be a sintered composite material in which a ceramic component is combined with a metal.
  • An example of a cermet is a titanium compound mainly composed of titanium carbide (TiC) or titanium nitride (TiN). It goes without saying that the material of the insert 1 is not limited to the above composition.
  • the surface of the insert 1 may be coated with a coating using a chemical vapor deposition (CVD) or physical vapor deposition (PVD) method, the composition of the coating may include, for example, titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina ( Al2O3 ).
  • CVD chemical vapor deposition
  • PVD physical vapor deposition
  • the cutting tool 101 may have a holder 103 and an insert 1, as shown in a non-limiting example in FIG. 13.
  • the insert 1 has excellent durability, making it possible to exhibit high cutting performance.
  • the holder 103 may extend from the first end 103a toward the second end 103b.
  • the extension direction of the holder 103 may coincide with the extension direction of the central axis O1 of the insert 1.
  • the holder 103 may also be rod-shaped extending from the first end 103a toward the second end 103b.
  • the holder 103 may be shaped like a prism.
  • the holder 103 may be shaped like a square prism.
  • the holder 103 may have a pocket 105.
  • the pocket 105 may be located on the side of the first end 103a.
  • the pocket 105 allows the insert 1 to be attached.
  • the holder 103 may have an upper jaw 107 and a lower jaw 109 located on the side of the first end 103a and spaced apart from each other, and the upper jaw 107 and the lower jaw 109 may form a pocket 105.
  • the insert 1 may be located within the pocket 105. If the holder 103 has an upper jaw 107 and a lower jaw 109, the insert 1 may be sandwiched between the upper jaw 107 and the lower jaw 109.
  • the insert 1 may be positioned in the pocket 105 such that at least a portion of the portion used as a cutting edge protrudes outward from the side of the first end 103a of the holder 103.
  • the insert 1 may be positioned in the pocket 105 such that at least a portion of the second cutting portion 7 protrudes outward from the side of the first end 103a of the holder 103.
  • the restraining surface 21 and the main body portion 3 of the first cutting portion 5 may abut against the holder 103.
  • the insert 1 may be attached to the pocket 105 by a screw 111.
  • the insert 1 may be attached to the pocket 105 by inserting the screw 111 into the screw holes of the upper jaw 107 and the lower jaw 109 and fixing the screw 111 to the screw holes.
  • the material of the holder 103 may be, for example, steel or cast iron. If the material of the holder 103 is steel, the holder 103 has high toughness.
  • the machined product 201 may be produced by cutting the workpiece 203.
  • a manufacturing method of the machined product 201 may include the following steps. (1) rotating the workpiece 203; (2) contacting a rotating workpiece 203 with a cutting tool 101, such as the cutting tool 101 of the non-limiting embodiment described above; (3) removing the cutting tool 101 from the workpiece 203;
  • the present invention may also include:
  • the workpiece 203 may be rotated around the axis O2 and the cutting tool 101 may be brought relatively close to the workpiece 203.
  • the tip cutting edge 17 of the cutting tool 101 may be brought into contact with the workpiece 203 to cut the workpiece 203.
  • the cutting tool 101 may be moved relatively away from the workpiece 203.
  • the cutting tool 101 has an insert 1 with excellent durability, making it possible to obtain a machined product 201 with a highly accurate finished surface.
  • step (1) the workpiece 203 may be brought closer to the cutting tool 101. Also, in step (3), the workpiece 203 may be moved away from the cutting tool 101. If cutting is to be continued, the workpiece 203 may be kept rotating and the step of bringing the cutting tool 101 into contact with different locations of the workpiece 203 may be repeated.
  • Examples of the material of the workpiece 203 include titanium alloys, aluminum, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.
  • a cutting insert has a rod shape extending along a central axis from a tip end to a rear end, and has a main body portion located in the center in a direction along the central axis, a first cutting portion located closer to the tip than the main body portion, and a second cutting portion located closer to the rear end than the main body portion, and the first cutting portion has a tip surface located on the tip side, an upper surface extending from the tip surface toward the main body portion, a first side surface extending from the tip surface toward the main body portion, a second side surface extending from the tip surface toward the main body portion and located on the opposite side to the first side surface, and a tip cutting edge located at an intersection of the tip surface and the upper surface, and the tip The end blade has a first end located on the side of the first side surface and a second end located on the side of the second side surface and closer to the main body portion than the first
  • an inclination angle of the first connection surface may be larger than an inclination angle of the constraint surface, and an inclination angle of the second connection surface may be smaller than an inclination angle of the constraint surface.
  • the first connection surface may have a width in a height direction that increases as it approaches the first side surface.
  • the second connection surface may have a width in a height direction that increases as it approaches the second side surface.
  • the first connection surface may have a curved shape, and a first region having a convex curved shape located along the relief surface, and a second region having a concave curved shape located along the constraint surface.
  • the second connection surface may have a flat area having a smaller inclination angle than the relief surface and the constraint surface.
  • an upper end of the first connection surface may be located higher than an upper end of the second connection surface.
  • a lower end of the first connection surface may be located higher than a lower end of the second connection surface.
  • the cutting tool may have a holder extending from a first end toward a second end and having a pocket located on the side of the first end, and a cutting insert according to any one of [1] to [8] above located in the pocket.
  • a method for manufacturing a machined product can include the steps of rotating a workpiece, contacting the rotating workpiece with the cutting tool described above in [9], and removing the cutting tool from the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
PCT/JP2024/031812 2023-09-20 2024-09-05 切削インサート、切削工具、及び切削加工物の製造方法 Pending WO2025063046A1 (ja)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009012118A (ja) * 2007-07-04 2009-01-22 Mitsubishi Materials Corp 切削インサート
JP2020519454A (ja) * 2017-05-15 2020-07-02 イスカル リミテッド 前部および後部コンポーネントの切れ刃を備えた分割切れ刃を有する切削インサート

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009012118A (ja) * 2007-07-04 2009-01-22 Mitsubishi Materials Corp 切削インサート
JP2020519454A (ja) * 2017-05-15 2020-07-02 イスカル リミテッド 前部および後部コンポーネントの切れ刃を備えた分割切れ刃を有する切削インサート

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