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Diamond coating drill bit and preparation method thereof

A diamond coating, diamond technology, applied in metal material coating process, coating, twist drill and other directions, can solve the problems of poor wear resistance, large chip discharge resistance, long service life, etc., to achieve wear resistance and chip discharge. Excellent performance, improve work efficiency, improve the effect of grinding performance

Active Publication Date: 2018-06-19
SHENZHEN JINZHOU PRECISION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Drills coated with microcrystalline diamond coating have excellent wear resistance when processing difficult-to-cut materials such as CFRP, high-Si Al alloys, graphite, and zirconia ceramics, but the chip discharge resistance is relatively large, so chips are easy to clog. Easy to cause tool breakage or decrease in drilling quality
However, if the surface of the drill bit is coated with a smooth nanocrystalline diamond coating, although the problem of chip removal of the coated drill bit is solved, there is a problem of poor wear resistance, and it is difficult to achieve a long service life.

Method used

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  • Diamond coating drill bit and preparation method thereof
  • Diamond coating drill bit and preparation method thereof
  • Diamond coating drill bit and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a diamond coated drill bit, such as figure 1 As shown, the drill bit includes a drill body 1 and a drill tip 2, the drill body 1 is coated with a nanocrystalline diamond coating, and the coating thickness is 10 μm; the drill tip 2 is coated with a microcrystalline diamond coating, and the coating is coated with a nanocrystalline diamond coating. The thickness of the layer is 10.5 μm; there is a transition zone 3 whose length is 1.2 times the diameter of the drill bit between the drill body 1 and the drill tip 2, and the grain size of the diamond coating coated on the transition zone 3 is between that of the diamond coating coated on the drill body 1. Between the nanocrystals and the microcrystals coated with the drill tip 2, the average thickness of the coating is 10.2 μm; the base of the drill bit is WC-Co alloy.

[0055] Carry out SEM scanning respectively to the drill body and drill point of the drill bit that present embodiment obtains, as ...

Embodiment 2

[0060] The present embodiment provides a diamond-coated drill bit, the drill bit comprises a drill body 1 and a drill tip 2, the drill body 1 is coated with a nanocrystalline diamond coating with an average grain size of about 20-150nm, and the thickness of the coating is The drill tip 2 is coated with a microcrystalline diamond coating with an average grain size of about 1-2 μm, and the coating thickness is 20 μm; the length between the drill body 1 and the drill tip 2 is 1.5 mm in diameter of the drill bit. times the transition zone 3, the grain size of the diamond coating coated in the transition zone 3 is between the nano crystals coated on the drill body 1 and the micro crystals coated on the drill tip 2, and the average thickness of the coating is 19.2 μm; The base body of the drill bit is WC-Co alloy.

[0061] The method for preparing a diamond-coated drill bit is the same as in Example 1. By adjusting the substrate temperature and deposition time, a nanocrystalline dia...

Embodiment 3

[0063] The present embodiment provides a diamond-coated drill bit, the drill bit includes a drill body 1 and a drill tip 2, the drill body 1 is coated with a nanocrystalline diamond coating with an average grain size of about 20-200nm, and the thickness of the coating is 8 μm; the drill bit 2 is coated with a microcrystalline diamond coating with an average grain size of about 0.5-3 μm, and the coating thickness is 12 μm; the length between the drill body 1 and the drill tip 2 is 1 times the diameter of the drill bit The transition zone 3, the grain size of the diamond coating coated in the transition zone 3 is between the nano crystals coated on the drill body 1 and the micro crystals coated on the drill tip 2, and the average thickness of the coating is 10.5 μm; The base of the drill bit is WC-Co alloy.

[0064] The method for preparing the diamond-coated drill bit is the same as in Example 1. By adjusting the substrate temperature and deposition time, a nanocrystalline diam...

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Abstract

The invention relates to a diamond coating drill bit and a preparation method thereof. The drill bit comprises a drill body (1) and a drill tip (2); the drill body (1) is coated with a carbon base coating layer such as a nanocrystalline diamond coating layer or a diamond-like coating layer; and the drill tip (2) is coated with a micron crystalline diamond coating layer. A heat stop cylinder is arranged on a heat wire chemical vapor deposition device; and the coating layers are obtained by using chemical vapor deposition. The drill tip and the drill body are respectively coated with the microncrystalline diamond coating layer and the carbon base coating layer with low friction coefficient such as the nanocrystalline diamond coating layer or the diamond-like coating layer; excellent wear resistance of the micron crystalline diamond coating layer and excellent chip discharge performance of the nanocrystalline diamond coating layer are fused to obtain the diamond coating drill bit with excellent wear resistance and chip discharge performance; the working efficiency of the drill bit is improved; the service life is prolonged; and excellent application prospect is achieved.

Description

technical field [0001] The invention relates to the field of mechanical processing and manufacturing, in particular to a diamond-coated drill bit and a preparation method thereof, in particular to a drill bit whose drill body and drill tip are coated with diamond coatings of different grain sizes and a preparation method thereof. Background technique [0002] At present, high-speed steel cutting tools, physical vapor deposition (PVD) and chemical vapor deposition (CVD) coated carbide cutting tools, ceramic cutting tools and polycrystalline diamond / polycrystalline boron nitride (PCD / PCBN) cutting tools due to low hardness or cutting tool shape Limited and other reasons can not fully meet the high-speed, high-efficiency processing of composite materials, A1Si non-ferrous alloys and special graphite and other material processing requirements. CVD diamond-coated cemented carbide has high hardness and can be deposited on tools with complex structures, becoming the best tool mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/27C23C16/46B23B51/02
CPCB23B51/02C23C16/26C23C16/271C23C16/46
Inventor 张贺勇
Owner SHENZHEN JINZHOU PRECISION TECH
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