Preparation method of diamond-coated drawing mold for water lubrication

A diamond coating, water lubrication technology, applied in metal drawing forming tools, metal material coating process, coating and other directions, can solve the problems of insignificant polishing effect, difficult polishing, limited application scope, etc., to eliminate The effect of fire safety hazards, avoiding ecological environment pollution and improving working conditions

Active Publication Date: 2015-12-30
SHANGHAI JIAOYOU DIAMOND COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large surface energy, high hardness, stable chemical properties, and thin thickness (tens of microns) of the diamond film, it is very difficult to polish. The traditional mechanical polishing method is time-consuming and laborious, and various new polishing methods a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] The substrate is a YG6 cemented carbide wire drawing die, the external dimension is Φ30×21mm, the diameter of the inner hole of the die is Φ8.0mm after grinding and correction, and then placed in 10% dilute hydrochloric acid, and 5 to 6 drops of hydrogen peroxide are dropped near the die hole. to remove cobalt from the surface of the holes in the substrate. After taking it out, it was cleaned and ground with SiC sandblasting and diamond powder. After cleaning, it was placed in the reaction chamber. After the reaction chamber is evacuated, the reaction gases are introduced: hydrogen, methane and ethanol. The molar ratio (volume ratio) of methane and ethanol is 2:1, that is, the C / O ratio in the carbon source is 4:1; trimethyl borate is dissolved in the ethanol, and the B / C ratio is 0.4%, (methane+ethanol) ) and hydrogen molar ratio of 2%, the total gas flow 800ml / min. Other CVD deposition diamond coating process conditions: pressure 5kPa, hot filam...

Example Embodiment

[0029] Example 2

[0030] The diameter of filament (tantalum wire) is φ0.8mm, φ0.8mm, φ0.8mm, φ0.7mm, φ0.7mm, φ0.7mm, φ0.6mm, φ0.6mm, φ0.6mm, corresponding to single-phase power 1150W, 1080W, 1000W, 900W, 800W, 800W, 750W, 720W, 700W, other same CVD deposition diamond process as in Example 1, diamond W1 micropowder polishing time 5 hours, prepared a set of diamond coating molds that can be used for water lubrication, The diameters of the inner holes are 10.50, 9.00, 7.73, 6.68, 5.82, 5.12, 4.55, 4.08, 3.73mm, respectively. The drawing test of the aluminum wire was carried out in the cable manufacturing enterprise. The incoming wire is Φ12mm aluminum rod, the outgoing wire is Φ3.73mm aluminum wire, the drawing speed is 18m / s (high-speed wire drawing), and the lubricating fluid is water-soluble wire drawing fluid (emulsion). As a result, the appearance and mechanical and physical properties of the finished aluminum wire are the same as those obtained by oil lubrication. The ...

Example Embodiment

[0031] Example 3

[0032] The diameter of the filament (tantalum wire) is φ0.9mm, the single-phase power is 1300W, the deposition time is 8 hours, the other CVD deposition diamond process is the same as that in Example 1, and the polishing time of diamond W1 micropowder is 0.5 hours to prepare a water-lubricated diamond coating. The drawing die, the drawing sleeve with a diameter of 13.85mm, has carried out the drawing test of the coaxial cable copper tube (outer conductor). The outer diameter of the incoming copper tube is Φ14.10mm. The company originally used carbide drawing It is necessary to use an oil-based lubricant for the sleeve. After drawing, it is necessary to wipe off the oil on the outer surface of the copper tube and dry it to ensure the quality of the subsequent extrusion process, which not only wastes lubricating oil, but also takes time and labor. However, a drawing sleeve suitable for water lubrication is used, and 10% emulsion is used to replace the oil lu...

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PUM

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Abstract

The invention discloses a preparation method of a diamond-coated drawing mold for water lubrication. The preparation method comprises corroding the surfaces of inner pores of a hard alloy drawing mold as a base with various pore sizes by hydrogen peroxide dropwisely added with dilute hydrochloric acid so that cobalt is removed, carrying out SiC powder sand blasting, carrying out diamond powder-based grinding coarsening, carrying out cleaning, carrying out diamond coating deposition by a hot-filament CVD method, and orderly carrying out anodic oxidation on the diamond-coated drawing mold under the condition of dilute sulphuric acid and coating grinding polishing on the diamond-coated drawing mold under the aerobic conditions or alternately carrying out the anodic oxidation and the coating grinding polishing on the diamond-coated drawing mold so that the diamond coating has the final surface smoothness Ra less than or equal to 0.1 microns. The diamond-coated drawing mold has high work surface hardness and can resist corrosion. Through the surface hydrophily of the diamond-coated drawing mold, water can form a continuous lubricating film and a self-lubricating graphite ingredient is uniformly distributed on the coating surface. In metal wire drawing and pipe size-reduction wall thickness-reduction drawing, water can replace lubricating oil so that a cost is reduced and ecological environment pollution caused by use of a lot of oil-based lubricating oil is avoided.

Description

technical field [0001] The invention belongs to the technical field of plating of metallurgical metal materials, and in particular relates to a method for preparing a diamond-coated drawing die suitable for water lubrication. Background technique [0002] In the field of metal drawing processing, oil-based lubricants are widely used to reduce the friction on the working surface of various wire drawing dies, so as to prolong the service life of the dies, improve production efficiency, and ensure the accuracy of the wire diameter and the processing quality of the finish. However, the oil-based lubricant itself has the characteristics of high ecotoxicity, poor biodegradability, and long residence time in the environment. Its leakage and discharge of processing waste liquid will cause serious pollution to the natural environment such as soil, water and air. In addition, the extensive use of oil-based lubricants in the drawing process will cause processing environmental pollution...

Claims

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Application Information

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IPC IPC(8): C23C16/27C23C16/56B21C3/00
Inventor 孙方宏张文骅郭睿郭松寿张志明沈荷生
Owner SHANGHAI JIAOYOU DIAMOND COATING
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