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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 are suitable for Limited, the processing cost is high, and the polishing effect is not obvious, which in turn will affect the quality and adhesion of the diamond film
Difficult polishing issues greatly limit the application of diamond films as water-lubricated diamond-coated drawing dies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The substrate is a YG6 cemented carbide wire drawing die, the outer dimension is Φ30×21mm, and the hole diameter is Φ8.0mm. To remove the cobalt on the surface of the inner hole of the substrate. After taking it out, clean it and use SiC sandblasting and diamond micropowder to grind it, and put it in the reaction chamber after cleaning. After the reaction chamber is evacuated, the reaction gases: hydrogen, methane and ethanol are introduced. The molar ratio (volume ratio) of methane and ethanol is 2: 1, promptly the C / O ratio is 4: 1 in the carbon source; Dissolve trimethyl borate in ethanol, and make B / C ratio be 0.4%, (methane+ethanol ) and the mol ratio of hydrogen are 2%, and the total gas flow rate is 800ml / min. Other CVD deposition diamond coating process conditions: pressure 5kPa, hot filament (tantalum wire) diameter φ0.8mm, single-phase heating power 1000W, DC bias current 3A, after 6 hours of deposition, a conductive diamond coating of about 15μm is deposite...

Embodiment 2

[0030] Respectively use filament (tantalum wire) diameter 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 CVD deposition diamond processes identical to 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 aluminum wire drawing test was carried out in the cable manufacturing enterprise. The aluminum wire is used for cable core stranding, drawing The incoming wire is a Φ12mm aluminum rod, the outgoing wire is a Φ3.73mm aluminum wire, the drawing speed is 18m / s (high-speed wire drawing), and the lubricating liquid is a water-soluble wire drawing liquid (emulsion). As a result, the finished aluminum wire has the same appearance and mechanical and physical properties a...

Embodiment 3

[0032] Using filament (tantalum wire) diameter φ0.9mm, single-phase power 1300W, deposition time 8 hours, other CVD deposition diamond process same as Example 1, diamond W1 micropowder polishing time 0.5 hour, prepared a diamond coating that can be lubricated by water The drawing die, the drawing sleeve with an aperture 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 cemented carbide for drawing The sleeve needs to use an oily lubricant. After drawing, the oil on the outer surface of the copper tube needs to be wiped off and dried to ensure the quality of the subsequent extrusion process, which wastes lubricating oil and is time-consuming and labor-intensive. However, the drawing sleeve suitable for water lubrication is used, and the oil lubricant is replaced by 10% emulsion, which reduces the material cost, and the outer surface of the copper...

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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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