Diamond Coated Cutting Tools

A cutting tool and diamond technology, applied in the field of diamond-coated cutting tools, can solve problems such as short service life, difficulty in forming cutting edges, and reduced machining accuracy, achieve sufficient wear resistance, improve lubricity and chip discharge, and reduce The effect of frictional resistance

Active Publication Date: 2015-11-25
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] For example, in the cutting of difficult-to-cut materials using the diamond-coated tools shown in Patent Documents 1 and 2, since the wear of the diamond film is relatively fast, it is necessary to increase the film thickness of the diamond film, but on the contrary, when increasing the film thickness When it is difficult to form a sharp cutting edge, there are problems such as a decrease in machining accuracy.
[0014] In addition, cutting tools made of diamond sintered bodies have excellent wear resistance compared with diamond-coated tools, but it is difficult to form sharp cutting edges, so it is difficult to improve machining accuracy.
[0015] In the diamond-coated tools shown in Patent Documents 3 to 5, since the sharp cutting edge is formed, an improvement in machining accuracy can be expected, but the diamond film on the cutting edge is fragile and chipping is likely to occur, so there is a problem that the service life is relatively short. problem points like short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (Laser processing rake face only)

[0077]As raw material powders, WC powder, TiC powder, TaC powder, NbC powder and Co powder each having an average particle size of 1 to 3 μm were prepared, and these raw material powders were blended into the compounding composition shown in Table 1, and wet mixed with a ball mill for 96 hours. , after drying, it is formed into a compact by stamping with a pressure of 100MPa, and the compact is sintered under the condition of maintaining a temperature of 1400°C for 1 hour in a vacuum of 6Pa, and the grinding process is performed, and the rake face of the cutting edge is mirror-finished. Cemented carbide substrates 1 to 10 each made of WC-based cemented carbide and having an insert shape according to ISO standard SPGN120308 were thus manufactured.

[0078] (a) Put the above-mentioned cemented carbide substrates 1-10 into a CVD apparatus. First, under the conditions shown in Table 2, vapor-deposit on the cutting edge, rake face, and fla...

Embodiment 2

[0128] (laser processing rake face and flank face)

[0129](a) Assemble the cemented carbide substrate having the crystalline diamond layer formed in Example 1 and the alternately laminated film by vapor deposition in a laser processing device, drive the laser light source of ultraviolet laser (wavelength: 262nm), and make the focusing lens Move along the optical axis direction of the ultraviolet laser, focus the ultraviolet laser at a position overlapping the center of the sample stage, then move the sample stage, and irradiate the ultraviolet laser on the rake face other than the cutting edge and the flank face, scan the laser with a galvano scanner to remove the alternately laminated film on the surface of the rake face and flank face other than the cutting edge,

[0130] (b) On the cutting edge, the crystalline diamond layer and the alternately laminated film shown in Table 10 are coated, and the surface layer on the rake face side and the surface layer on the flank side o...

Embodiment 3

[0163] (end mill)

[0164] As raw material powders, WC powder, TiC powder, TaC powder, NbC powder and Co powder each having an average particle diameter of 1 to 3 μm were prepared, and these raw material powders were blended into the compounding composition shown in Table 1, and wet mixed with a ball mill for 96 hours, After drying, it was pressed into a green compact with a pressure of 100 MPa, and the green compact was sintered under the condition of maintaining a temperature of 1400° C. for 1 hour in a vacuum of 6 Pa to form a round rod sintered body with a diameter of 13 mm for tool base formation. Processing From the round bar sintered body, a WC-based cemented carbide tool base (end mill) having a cutting edge with a diameter x length of 10 mm x 22 mm and a helix angle of 10 degrees in the shape of a four-edged square was manufactured, respectively. 1 to 10.

[0165] Next, the surfaces of these cemented carbide substrates (end mills) 1 to 15 are ultrasonically cleaned i...

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Abstract

The invention provides a cutting tool covered with diamond. The tool substrate composed of tungsten carbide cemented carbide or titanium carbonitride base metallic ceramics is covered with a crystal diamond layer. Nanometer diamond film having average grain diameters of 1 to 50 nm and laminated alternatively at a lamination space of 0.2 to 2.0 micrometers and alternating lamination films of crystal diamond film having average grain diameters of 0.1 to 2 micrometers cover the crystal diamond layer. The shortest distance between the front end of a cutting blade to the crystal diamond layer is determined to be 3 to 15 micrometers. And a non-crystal carbon film having surface roughness less than 0.1 micrometer and thickness of 10 to 200 micrometers is formed on the surface layer of a front blade face of the nanometer diamond layer of the cutting blade.

Description

technical field [0001] The invention relates to a diamond coated with at least a crystalline diamond layer on the surface of a tool substrate (hereinafter referred to as tool substrate) composed of tungsten carbide (WC)-based cemented carbide or titanium carbonitride (TiCN)-based cermet. A coated cutting tool, in particular, a diamond coated tool that exhibits excellent chip discharge performance in cutting difficult-to-cut materials such as CFRP (Carbon fiber reinforced plastic) materials, high-Si-containing aluminum alloys, and graphite, and exhibits excellent wear resistance during long-term use. Coated cutting tools (hereinafter referred to as diamond-coated tools). Background technique [0002] In the past, a diamond-coated tool coated with a diamond film on the surface of the tool substrate is known, and it is known that in order to improve the strength and toughness of the film, diamond and microcrystalline diamond (or amorphous diamond) as crystallinity are higher. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/28B23B27/14B23C5/10B23B51/00C23C14/06
Inventor 高岛英彰高冈秀充
Owner MITSUBISHI MATERIALS CORP
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