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Salt-bath heat treatment technology of piston rod

A piston rod and surface heat treatment technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., to achieve the effects of strong wear resistance, optimized processing procedures, and simple operation

Inactive Publication Date: 2009-11-18
QINGDAO ZHANGSHI MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a novel piston rod surface heat treatment process for the deficiencies of the existing piston rod surface treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0028] A piston rod salt bath heat treatment process, comprising the steps of:

[0029] (1) Preliminary processing of piston rod

[0030] A. Cutting: Cut off the piston rod according to the predetermined length;

[0031] B. Annealing: eliminate the stress of the piston rod;

[0032] C. Straightening;

[0033] D. Coarse grinding: remove impurities such as rust on the surface of the piston rod;

[0034] E. High spray quenching: increase the surface hardness of the piston rod;

[0035] F. Tempering and straightening;

[0036] G. Grinding: Make the outer diameter of the piston rod reach the specified size.

[0037] (2) Heat treatment of piston rod surface

[0038] A. Cleaning: Put the pre-processed piston rod into an ultrasonic cleaning machine and clean it for 10 minutes at 50°C, then rinse with water to remove cutting impurities on the surface of the piston rod;

[0039] B. Preheating and drying: Put the cleaned piston rod in a dryer and heat it for 10 minutes at 400°C to...

specific Embodiment 2

[0057] A piston rod salt bath heat treatment process, comprising the steps of:

[0058] (1) Preliminary processing of piston rod

[0059] A. Cutting: Cut off the piston rod according to the predetermined length;

[0060] B. Annealing: eliminate the stress of the piston rod;

[0061] C. Straightening;

[0062] D. Coarse grinding: remove impurities such as rust on the surface of the piston rod;

[0063] E. High spray quenching: increase the surface hardness of the piston rod;

[0064] F. Tempering and straightening;

[0065] G. Grinding: Make the outer diameter of the piston rod reach the specified size.

[0066] (2) Heat treatment of piston rod surface

[0067] A. Cleaning: Put the pre-processed piston rod into an ultrasonic cleaning machine and clean it for 10 minutes at 50°C, then rinse with water to remove cutting impurities on the surface of the piston rod;

[0068] B. Preheating and drying: Put the cleaned piston rod in a dryer and heat it for 10 minutes at 400°C to...

specific Embodiment 3

[0073] A piston rod salt bath heat treatment process, comprising the steps of:

[0074] (1) Preliminary processing of piston rod

[0075] A. Cutting: Cut off the piston rod according to the predetermined length;

[0076] B. Annealing: eliminate the stress of the piston rod;

[0077] C. Straightening;

[0078] D. Coarse grinding: remove impurities such as rust on the surface of the piston rod;

[0079] E. High spray quenching: increase the surface hardness of the piston rod;

[0080] F. Tempering and straightening;

[0081] G. Grinding: Make the outer diameter of the piston rod reach the specified size.

[0082] (2) Heat treatment of piston rod surface

[0083] A. Cleaning: Put the pre-processed piston rod into an ultrasonic cleaning machine and clean it for 10 minutes at 50°C, then rinse with water to remove cutting impurities on the surface of the piston rod;

[0084] B. Preheating and drying: Put the cleaned piston rod in a dryer and heat it for 10 minutes at 400°C to...

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Abstract

The invention relates to a salt-bath heat treatment technology of a piston rod, which comprises the following steps of primary processing of the piston rod and surface heat treatment of the piston rod, wherein the surface heat treatment technology of the piston rod puts emphasis on first nitrogen treatment and second oxidation treatment, thus realizing the combination of wearing resistance and corrosion resistance and the combination of heat treatment technique and aseptic technique. The heat treatment technology is simple in operation, easy for realization and low in cost; the piston rod produced by the method has smooth surface, strong corrosion resistance and wearing resistance, low rejection rate, long service life, and no air leakage. The technology accomplishes the heat treatment and anti-corrosion treatment at one time, has low treatment temperature, short time, and ability for improving the hardness, wearing resistance, corrosion resistance and fatigue strength of the surfaces of the parts simultaneously, reduces friction coefficient and lowers the brittleness of the piston rod, leads to small deformation, is nuisanceless and obviously expands the range of materials suitable to nitrocarburizing, namely the treatments of all materials have good effects, thus having the advantages of optimizing processing procedures, shortening production period and lowering production cost.

Description

technical field [0001] The invention relates to a metal surface heat treatment process, in particular to a surface heat treatment process applied to piston rods of gas rods such as automobiles. Background technique [0002] Most of the existing automobile piston rod surface treatment processes can be divided into electroplating, spray coating and heat treatment. Electroplating mostly polishes the surface of the piston rod, and then electroplates chrome, copper, zinc, tin, cadmium, titanium and other metals. However, due to the The method is seriously polluted and has been gradually abandoned. The main problems in the spraying process are highly dispersed paint mist and volatilized solvents, which not only pollute the environment, are not conducive to human health, but also waste paint and cause economic losses. The reciprocating movement is frequent. If the spray coating is not tightly combined with the piston rod body, it will easily cause problems such as falling off. Ther...

Claims

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Application Information

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IPC IPC(8): C23C8/58C23C8/02
Inventor 张希铭左殿芳张立智
Owner QINGDAO ZHANGSHI MACHINERY
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