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CN-122028995-A - Cutting tool

CN122028995ACN 122028995 ACN122028995 ACN 122028995ACN-122028995-A

Abstract

The cutting tool is a cutting tool provided with a base material and a diamond layer coating the base material. The cutting tool includes a rake surface and a relief surface. The rear cutter surface is connected with the front cutter surface. The ridge lines of the rake face and the flank face form the cutting edge. The diamond layer has a relief coating. The relief surface coating portion constitutes a relief surface. The thickness of the rear surface coating part is 10 μm or more and 25 μm or less. In a cross section perpendicular to a tangent of the cutting edge, a radius of curvature of the cutting edge is smaller than a value obtained by multiplying the thickness of the flank surface coating portion by 0.3. The rake face includes a first portion. The first portion is formed by a relief surface coating. The first portion is connected to the relief surface. The maximum height roughness of the first portion is less than 2 μm.

Inventors

  • YAMADA KENTO
  • Trigonometric Zhou Ping
  • Dong Taizhu
  • Ping Chuiyoushu
  • KUKINO SATORU

Assignees

  • 住友电工硬质合金株式会社

Dates

Publication Date
20260512
Application Date
20231129

Claims (8)

  1. 1. A cutting tool comprising a base material and a diamond layer coating the base material, wherein, The cutting tool comprises a rake surface and a flank surface connected to the rake surface, The ridge lines of the rake face and the flank face form a cutting edge, The diamond layer has a relief surface coating that constitutes the relief surface, The thickness of the rear blade coating part is more than or equal to 10 mu m and less than or equal to 25 mu m, In a cross section perpendicular to a tangent of the cutting edge, a radius of curvature of the cutting edge is smaller than a value obtained by multiplying a thickness of the relief surface covering portion by 0.3, The rake face comprises a first portion, which is formed by the flank face covering portion and is connected with the flank face, The maximum height roughness of the first portion is less than 2 μm.
  2. 2. The cutting tool of claim 1, wherein, The rake face has: A first rake surface portion separate from the relief surface, and The second front cutter surface part is arranged between the first front cutter surface part and the rear cutter surface part and is respectively connected with the first front cutter surface part and the rear cutter surface part, The second rake surface portion is inclined with respect to the first rake surface portion in a direction from the first rake surface portion toward the relief surface.
  3. 3. The cutting tool of claim 2, wherein, The second rake surface portion has an inclination angle of 3 DEG to 50 DEG inclusive with respect to the first rake surface portion.
  4. 4. The cutting tool according to any one of claims 1 to 3, wherein, The thickness of the rear blade coating part is 15 μm or more and 20 μm or less.
  5. 5. The cutting tool according to any one of claims 1 to 4, wherein, In a cross section perpendicular to a tangent of the cutting edge, a radius of curvature of the cutting edge is smaller than a value obtained by multiplying a thickness of the relief surface covering portion by 0.1.
  6. 6. The cutting tool according to any one of claims 1 to 5, wherein, The substrate is composed of cemented carbide containing tungsten carbide particles, The tungsten carbide particles have an average particle diameter of 2 μm or less.
  7. 7. The cutting tool according to any one of claims 1 to 6, wherein, The relief angle of the relief surface is 15 DEG to 35 deg.
  8. 8. The cutting tool according to any one of claims 1 to 7, wherein, The maximum height roughness of the first portion is less than 1.5 μm.

Description

Cutting tool Technical Field The present disclosure relates to cutting tools. Background Japanese patent application laid-open No. 2015-085462 (patent document 1) discloses a hard film coated cutting tool in which a tool body having a cutting edge formed at a intersecting edge line region of a flank face and a rake face is coated with a diamond film. In the hard film coated cutting tool, the thickness of the diamond film on the flank face side is 8 μm to 30 μm. The radius of the rounded corner of the edge of the cutting edge is 0.1 to 0.8 times the thickness of the diamond film on the flank face side when the rounded corner is approximated by an arc of the radius. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2015-085462. Disclosure of Invention The cutting tool according to the present disclosure is a cutting tool including a base material and a diamond layer coating the base material. The cutting tool includes a rake surface and a relief surface. The rear cutter surface is connected with the front cutter surface. The ridge lines of the rake face and the flank face form the cutting edge. The diamond layer has a relief coating. The relief surface coating portion constitutes a relief surface. The thickness of the rear surface coating part is 10 μm or more and 25 μm or less. In a cross section perpendicular to a tangent of the cutting edge, a radius of curvature of the cutting edge is smaller than a value obtained by multiplying the thickness of the flank surface coating portion by 0.3. The rake face includes a first portion. The first portion is formed by a relief surface coating. The first portion is connected to the relief surface. The maximum height roughness of the first portion is less than 2 μm. Drawings Fig. 1 is a schematic plan view showing a cutting tool according to a first embodiment. Fig. 2 is an enlarged schematic plan view showing a region II of fig. 1. Fig. 3 is an enlarged schematic side view showing the structure of the cutting tool according to the first embodiment. Fig. 4 is a schematic cross-sectional view along the IV-IV line of fig. 2. Fig. 5 is an enlarged sectional view schematically showing a region V of fig. 4. Fig. 6 is a flowchart schematically showing a method for manufacturing a cutting tool according to the first embodiment. Fig. 7 is a schematic cross-sectional view showing a process of sharpening a cutting edge by laser processing a rake face. Fig. 8 is a schematic cross-sectional view showing a structure of a cutting tool according to a second embodiment. Fig. 9 is a schematic cross-sectional view showing a process of sharpening a cutting edge by laser processing a rake surface in the method of manufacturing a cutting tool according to the second embodiment. Fig. 10 is a partially cross-sectional schematic view showing a state of use of the cutting tool according to the present disclosure. Detailed Description [ Problem to be solved by the present disclosure ] When the cutting edge of the cutting tool is covered with the diamond layer, the wear resistance of the tool increases as the thickness of the diamond layer increases. As the radius of curvature of the cutting edge becomes smaller, the sharpness of the cutting edge increases. Thereby, damage to the cutting tool can be suppressed. However, even when the thickness of the diamond layer is large and the radius of curvature of the cutting edge is small, chip adhesion in the cutting edge may occur due to the surface state of the diamond layer. Thus, by forming the structural edge, damage to the tool is easily progressed. As described above, in a cutting tool having a diamond layer, it is difficult to improve the tool life. An object of the present disclosure is to provide a cutting tool capable of improving tool life. [ Effect of the present disclosure ] According to the present disclosure, a cutting tool capable of improving tool life can be provided. [ Summary of the embodiments ] First, an outline of the embodiments of the present disclosure will be described. (1) The cutting tool according to the present disclosure is a cutting tool including a base material and a diamond layer coating the base material. The cutting tool includes a rake surface and a relief surface. The rear cutter surface is connected with the front cutter surface. The ridge lines of the rake face and the flank face form the cutting edge. The diamond layer has a relief coating. The relief surface coating portion constitutes a relief surface. The thickness of the rear surface coating part is 10 μm or more and 25 μm or less. In a cross section perpendicular to a tangent of the cutting edge, a radius of curvature of the cutting edge is smaller than a value obtained by multiplying the thickness of the flank surface coating portion by 0.3. The rake face has a first portion. The first portion is formed by a relief surface coating. The first portion is connected to the relief surface. The maximum height rou