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A method of manufacturing a diamond film piston pin extrusion punch

A technology of diamond film and manufacturing method, applied in the direction of metal extrusion forming tools, metal extrusion, manufacturing tools, etc., can solve the problems of production line shutdown, economic loss, breakage, etc., and achieve improved service life and efficiency. The effect of continuous appearance and excellent heat dissipation performance

Active Publication Date: 2018-10-12
武汉世纪中航超强金刚石膜高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practical experience and theoretical calculations show that the ratio of depth to diameter of a low-carbon steel back-extrusion hole should be less than 2.5-3.0. When the depth-diameter ratio of the back-extruded inner hole exceeds 2.5, the The reverse extrusion punch is easily unstable and broken under the action of huge extrusion stress
[0004] During the extrusion process of the high-speed multi-station automatic cold forming machine, a large amount of deformation heat of the workpiece is transferred to the mold (punch), causing the temperature of the punch to rise sharply. At the same time, during the deep hole extrusion, the extruded material flows greatly, The lubricating film on the surface of the workpiece in contact with the punch is extremely extended, and it is easy to lose the isolation and lubrication effect, which eventually leads to serious adhesion and burns between the ordinary carbide punch and the workpiece
[0005] In order to improve work efficiency, punching and extruding automobile piston pin companies usually use a multi-station automatic cold forming machine that completes from coil steel to workpiece. This equipment is a large-scale processing center that operates continuously. And breakage will cause the production line to stop working and wait for materials, causing huge economic losses to the enterprise

Method used

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  • A method of manufacturing a diamond film piston pin extrusion punch

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Piston pin extrusion punch: diameter Ø20, total length 140mm, effective working length 90mm, of which the length of the extrusion part of the punch is 18 mm, material: YG8 solid carbide.

[0023] Such as figure 1 Shown, a kind of manufacturing method of diamond film piston pin extruding punch comprises the following steps:

[0024] 1. Grind the YG8 solid carbide piston pin extrusion punch (hereinafter referred to as "workpiece") according to the dimensional accuracy of the drawing;

[0025] 2. Use anhydrous ether (alcohol) to clean and remove the anti-rust oil on the surface of the workpiece, then put the cleaned workpiece into a constant temperature drying oven, and dry it within 1min, with the temperature controlled at 50°C;

[0026] 3. Use Na 2 FeO 4 , potassium hydroxide, and water are prepared into a pretreatment solution in a ratio of 1:2:20 by weight;

[0027] 4. Put the part of the workpiece with a working length of 90 mm into the pretreatment solution, plac...

Embodiment 2

[0036] Piston pin extrusion punch: diameter Ø18, total length 120mm, effective working length 70mm, of which the length of the extrusion part of the punch is 18 mm, material: YG8 solid carbide.

[0037] The steps to make the diamond film piston pin extrusion punch are as follows:

[0038] 1. Grind the YG8 solid carbide piston pin extrusion punch (hereinafter referred to as "workpiece") according to the dimensional accuracy of the drawing;

[0039] 2. Use anhydrous ether (alcohol) to clean and remove the anti-rust oil on the surface of the workpiece, then put the cleaned workpiece into a constant temperature drying oven and dry it within 1min, with the temperature controlled at 60°C;

[0040] 3. Use Na 2 FeO 4 , potassium hydroxide, and water are prepared into a pretreatment solution in a ratio of 1:2:20 by weight;

[0041] 4. Put the part of the workpiece with a working length of 90 mm into the pretreatment solution, place it in an ultrasonic cleaner, and vibrate for 60 min...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/10
Inventor 陈远达杨中凯王胜云何静杨逸沈军
Owner 武汉世纪中航超强金刚石膜高科技有限公司
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