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Technique for coating cermet on inner and outer round surface of mechanical parts

A cermet, extrusion molding technology, applied in the field of mechanical processing, can solve problems such as affecting the ecological environment and short product life, and achieve the effects of not easy mechanical damage, improved service life, and high hardness

Inactive Publication Date: 2009-10-28
JIANGXI HUAWU HEAVY IND
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cermet coating technology based on the principle of extruding the inner and outer circular surfaces of mechanical parts, thereby solving the defects of short product life and affecting the ecological environment

Method used

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Embodiment Construction

[0018] A metal-ceramic coating technology based on the extrusion molding principle of the inner and outer circular surfaces of mechanical parts, the steps are as follows:

[0019] a) The coated surface of the rough-machined workpiece on the lathe, with a processing roughness of 25;

[0020] b) The workpiece is shot-peened on the coated surface without any pollution;

[0021] c), first uniformly kneading the cermet solid micropowder and the organic binder to make a paste cermet;

[0022] d) Use an injection coating machine to evenly spray the paste cermet on the surface of the workpiece according to the thickness of 0.2-0.3MM;

[0023] e), and then use 650 ° C medium frequency induction remelting method to make it densely formed, and at the same time remove the organic binder in the formed blank;

[0024] f) Grinding with a diamond grinding wheel to the upper tolerance limit, with a roughness of 0.8;

[0025] g) Polishing on the polishing machine to the tolerance requirement...

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Abstract

The invention relates to a technique for coating metallic ceramic onto inner and outer circular surface of mechanical parts according to extrusion molding principle, which belongs to the field of mechanical machining. According to the extrusion molding principle in powdery metallurgy, metal ceramic solid micro powder and organic binder are uniformly melted into pasty, the metal ceramic in paste is uniformly coated onto the working surface by an injection coating machine, the working surface is compactly modeled by induction melting process, and organic binder is removed in the molding blank, and production of hydraulic cylinder metal ceramic coating is finally completed after grinding by a diamond wheel and polishing machining. Comparing with the prior art, the invention is high in surface rigidity, durable for corrosion, and abrasion resistant for the coating layer, so that the life of the hydraulic cylinder is prolonged. No substance harmful or toxic to human is generated, no air and environment pollution occurs during manufacturing process of hydraulic cylinder coated with metal ceramic or ceramic.

Description

technical field [0001] The invention relates to a metal ceramic coating technology based on the principle of extruding the inner and outer circular surfaces of mechanical parts, and belongs to the field of mechanical processing. Background technique [0002] The surface of the inner and outer circles of the traditional hydraulic cylinder is electroplated with hard chromium. Due to the existence of the potential difference between the chromium plating layer and the base metal of the mechanical parts, electrolysis will be formed. This potential difference is a catalyst, which forms rust on the surface of the mechanical parts, especially in the presence of The second catalyst, such as: when saline seawater exists, it will be more serious, so its life is quite short compared with the life of other parts of the hydraulic cylinder; It is very sensitive to injury or other mechanical damage, and this shortcoming will also greatly shorten the life of the hydraulic cylinder; there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04
Inventor 谢林修
Owner JIANGXI HUAWU HEAVY IND
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