A method of manufacturing a diamond film piston pin extrusion punch

Abstract

The invention discloses a manufacturing method of an extrusion punching head of a diamond film piston pin. The method comprises the following steps: cleaning and drying; pretreating; polishing and grinding a workpiece; nucleating by using hot filament CVD (Chemical Vapor Deposition) deposition equipment; growing; and depositing a coated diamond film. As compared with a common high-speed tool steel punching head, the diamond film coated extrusion punching head manufactured by the manufacturing method disclosed by the invention has the advantage that the service life and the efficiency can be prolonged and improved by 8 to 10 times; compared with a NCr-coated hard alloy punching head, the diamond film coated extrusion punching head has the advantage that the service life and the efficiency can be prolonged and improved by 5 to 8 times.

Description

technical field

[0001] The invention relates to a process for coating the surface of a cold stamping extrusion tool with a diamond film, in particular to a method for manufacturing a diamond film piston pin extrusion punch, which can also be widely used in the processing of other extrusion punches. Background technique

[0002] The automotive piston pin is an important part of the internal combustion engine. There are many ways to manufacture piston pins, among which the cold extrusion and perforation of solid bars is the main process for industrial mass production.

[0003] The automobile piston pin is a thick-walled long cylindrical part. The shape is simple, but the difficulty of cold extrusion processing is quite large. Generally, thick-walled cylindrical parts can be made by reverse extrusion to make deep holes and then punch the bottom. However, practical experience and theoretical calculations show that the ratio of depth to diameter of a low-carbon steel back-extr...

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