Preparation method of diamond coating wire-drawing die with small aperture

A technology of diamond coating and wire drawing die, applied in the direction of wire drawing die, metal material coating process, coating, etc., can solve the problems of die ablation, difficulty in neutral operation, difficulty in forming diamond film, etc., and achieve dimensional accuracy High, good surface quality, long service life effect

Active Publication Date: 2013-05-22
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The main reason is that the distance between the hot wire and the mold wall is less than 0.8mm, and the hot wire at nearly 2000°C will ablate the mold; secondly, when the hole diameter is less than 1.0mm, it is very difficult for the hot wire to perforate the neutral operation of multiple molds ; There is also a barrier effect of the micro-pore diameter on the reaction atmosphere in the conventional chemical vapor deposition process, making it difficult to generate a diamond film on the working surface in the micro-pore
The above points limit the application of CVD diamond coating in smaller aperture drawing dies

Method used

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  • Preparation method of diamond coating wire-drawing die with small aperture
  • Preparation method of diamond coating wire-drawing die with small aperture

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 As shown, after the surface decarburization and acid treatment of the wire drawing die base 1 to remove cobalt, a layer of insulating silicon dioxide 4 is brushed on the outer periphery of the wire drawing die, and then neatly arranged on the fixture on the cooling platform in the reaction chamber. A heating wire 2 is respectively arranged at the exit and entrance of the mould, one end is fixed on the electrode, and the other end is tensioned by a high temperature spring 3 . At both ends of the hot wire, a DC power supply is used to heat the hot wire 2 to decompose the gas and radiate to heat the wire drawing die base 1. At the same time, a negative bias voltage 6 is applied between the hot wire and the wire drawing die base to make the gas decompose more fully and make the decomposition reaction The atmosphere moves directionally to areas not brushed...

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Abstract

The invention provides a preparation method of diamond coating wire-drawing die with small aperture. The preparation method comprises the following steps: taking a low-cobalt cemented carbide wire-drawing die with small aperture (phi0.8mm (aperture of phi 1.5mm)) as a matrix, repairing the die to preserve the thickness of a coating and the tolerance size of the die, performing surface decarburization treatment and dilute nitric acid cobalt removal pretreatment, and preparing micronano diamond composite coating wire-drawing die with small aperture by adopting a hot filament chemical vapor deposition method through a space hot filament array and an area selection growth method. The service life of the wire-drawing die with small aperture can be greatly prolonged, thereby having important significance on the continuous wire drawing and high productivity demand.

Description

technical field [0001] The invention relates to a method in the field of diamond manufacturing technology, in particular to a method for preparing a micro-aperture diamond-coated wire drawing die. Background technique [0002] The micro-aperture drawing die is usually the last few passes of the finished wire drawing, which is directly related to the production efficiency and quality of the finished wire. Therefore, the quality and performance of the micro-aperture drawing die play a vital role in wire drawing. As the hole size of the drawing die decreases, the drawing speed is faster, the area of ​​friction and wear contact is smaller, the wear is faster, and the service life of the die is shorter. At present, cemented carbide and polycrystalline molds are used for molds below φ1.5mm. Although cemented carbide molds are cheap, their service life is only 3 tons; while polycrystalline molds have a long service life when they are removed and maintained every day. Generally be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/27C23C16/04C23C16/02C23C16/46B21C3/02
Inventor 李建国万强胡东平黄飞丰杰刘伟胡绍全
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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