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Nitrogen-leaching heat treatment processing process for chromium-plated hydraulic valve rod

A processing technology, hydraulic valve technology, applied in the direction of metal material coating technology, coating, solid diffusion coating, etc., can solve the problem of easy peeling off and wear resistance of chrome plating layer, achieve easy peeling off, improve wear resistance and hardness , The effect of improving the quality of electroplating

Inactive Publication Date: 2018-04-10
SICHUAN CHANGJIANG HYDRAULIC TIANCHENG 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 solve the problem that the chromium plating layer of the existing hydraulic valve stem is easy to fall off and has poor wear resistance, and the present invention provides a nitrogen-immersed heat treatment process for the chrome-plated hydraulic valve stem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A chrome-plated hydraulic valve stem nitrogen immersion heat treatment process, comprising the following steps:

[0027] 1) Preliminary processing: use CNC machine tools for preliminary processing to obtain hydraulic valve stems;

[0028] 2) Chrome plating

[0029] a. Sandblasting: sandblasting the hydraulic valve stem prepared in step 1) with a sandblasting machine, then washing with water, the water temperature is 58°C;

[0030] b. Electroplating: Put the hydraulic valve after the sand blasting treatment in the previous step into the electroplating tank filled with electroplating solution for electroplating treatment. First, use a current density of 8A / dm2 to treat the hydraulic valve for 150s, and then use a current density of 85A. The hydraulic valve is treated with a current of / dm2 for 45s, and finally the hydraulic valve is treated with a current density of 32A / dm2 for 2.5h, and the temperature of the electroplating bath is 56°C;

[0031] The electroplating sol...

Embodiment 2

[0044] A chrome-plated hydraulic valve stem nitrogen immersion heat treatment process, comprising the following steps:

[0045] 1) Preliminary processing: use CNC machine tools for preliminary processing to obtain hydraulic valve stems;

[0046] 2) Chrome plating

[0047] a. Sandblasting: sandblasting the hydraulic valve stem prepared in step 1) with a sandblasting machine, then washing with water, the water temperature is 65°C;

[0048] b. Electroplating: Put the hydraulic valve after the sand blasting treatment in the previous step into the electroplating tank filled with electroplating solution for electroplating treatment. First, use a current density of 10A / dm2 to treat the hydraulic valve for 135s, and then use a current density of 95A. The current of / dm2 treats the hydraulic valve for 42s, and finally uses the current with a current density of 40A / dm2 to treat the hydraulic valve for 2h, and the temperature of the electroplating bath is 60°C;

[0049] The electroplat...

Embodiment 3

[0060] A chrome-plated hydraulic valve stem nitrogen immersion heat treatment process, comprising the following steps:

[0061] 1) Preliminary processing: use CNC machine tools for preliminary processing to obtain hydraulic valve stems;

[0062] 2) Chrome plating

[0063] a. Sandblasting: sandblasting the hydraulic valve stem prepared in step 1) with a sandblasting machine, then washing with water, the water temperature is 62°C;

[0064] b. Electroplating: Put the hydraulic valve after sandblasting in the previous step into the electroplating tank filled with electroplating solution for electroplating treatment. First, use a current density of 9A / dm2 to treat the hydraulic valve for 142s, and then use a current density of 90A. The current of / dm2 treats the hydraulic valve for 44s, and finally uses the current density of 36A / dm2 to treat the hydraulic valve for 2.25h, and the temperature of the electroplating bath is 58°C;

[0065] The electroplating solution includes sulfur...

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Abstract

The invention discloses a nitrogen-leaching heat treatment processing process for a chromium-plated hydraulic valve rod and relates to the technical field of hydraulic equipment. Aiming at the problems that a chromium-plated layer of an existing hydraulic valve rod is prone to fall off and is poor in wear resistance, the nitrogen-leaching heat treatment processing process for the chromium-plated hydraulic valve rod comprises the steps of (1) initial processing, (2) chromium-plating processing and (3) nitrogen-leaching heat treating and the like, wherein a multiple-stage type nitrogen-leachingheat treatment process of low temperature and low nitrogen-high temperature and high nitrogen-low temperature and high nitrogen-high temperature and high nitrogen-high temperature and low nitrogen isadopted in the step (3) of the nitrogen-leaching heat treating, the hardness and wear resistance of a surface layer and the chromium-plated layer of the hydraulic valve rod can be effectively improved, the fusion degree of the chromium-plated layer and the hydraulic valve rod is improved, the chromium-plated layer is made to be not prone to fall off, and the service life of the hydraulic valve rodis prolonged.

Description

technical field [0001] The invention relates to the technical field of hydraulic equipment, in particular to a chrome-plated hydraulic valve stem soaking nitrogen heat treatment process. Background technique [0002] The hydraulic valve stem is an important part of the hydraulic valve. It is used for transmission. The upper part is connected to the actuator or the handle, and the lower part directly drives the valve core to move or rotate, so as to realize the switching or adjustment of the hydraulic valve. The hydraulic valve stem is not only a moving part, a stressed part, but also a sealing part during the opening and closing process of the hydraulic valve. At the same time, it is impacted and corroded by the medium, and also has friction with the filler. Therefore, when selecting the material of the valve stem, it must be ensured that it has sufficient strength, good impact toughness, scratch resistance, and corrosion resistance at the specified temperature. Chromium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/18C25D5/50C23C8/34C23C8/24C25D3/10
CPCC25D5/18C23C8/24C23C8/34C25D3/10C25D5/50
Inventor 张勇
Owner SICHUAN CHANGJIANG HYDRAULIC TIANCHENG MACHINERY
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