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Thermal treatment process for plunger rod (piston rod) of nitrogen gas spring

A nitrogen gas spring and plunger rod technology, used in metal material coating process, coating, solid diffusion coating and other directions, can solve the gap between the hardness of the substrate and the surface, the adhesion is not firm and foaming, the service life is affected, and the seal is damaged. problems, to achieve the effect of easy control of the nitriding layer structure, energy saving and high surface strength

Inactive Publication Date: 2017-08-18
DONGGUAN XINYUE MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas nitriding is easy to produce nitrogen white layer, which will cause surface peeling, damage the seal and affect the service life
Although the PVD treatment has a high surface hardness and improves wear resistance, it is prone to weak adhesion, blistering and peeling due to the large gap between the substrate and the surface hardness, which will damage the seal and affect the service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Provide a kind of heat treatment process of nitrogen spring plunger rod (piston rod), comprise the steps:

[0021] A1. Select 38CrMoAl (GB / T3077-1999) advanced nitriding steel as the base material of the nitrogen spring plunger rod (piston rod);

[0022] A2. Clean the workpiece to be nitrided first with a cleaning solution to ensure that there is no iron filings, no oil, paint and other foreign matter on the surface;

[0023] A3. Then dry or dry, and wipe the surface of the workpiece with cotton cloth before loading the furnace;

[0024] A4. Place the workpieces evenly on the cathode disk in the glow ion nitriding system. The stacking can be stacked layer by layer. The distance between the workpieces in the same layer is guaranteed to be greater than 15mm. The workpieces in the same furnace are as large as possible. , can extend the heating time, so that the workpiece can be fully balanced in heat exchange;

[0025] A5. Set the following process parameters for the glo...

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PUM

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Abstract

The invention discloses a thermal treatment process for a plunger rod (piston rod) of a nitrogen gas spring. The thermal treatment process comprises the following steps of: selecting 38CrMoAl(GB / T3077-1999) (GB / T3077-19999) high-grade nitriding steel as a base material of the nitrogen gas spring plunger rod (piston rod); cleaning to-be-nitrided workpieces by cleaning liquor to ensure that the surfaces of the workpieces are free of other foreign matters such as scrap iron, greasy dirt and oil paint; performing drying or air-curing, and wiping the surfaces of the workpieces by cotton cloth before charging; uniformly putting the workpieces onto a cathode disc in a glow ion nitriding system, stacking the workpieces layer by layer, ensuring a spacing distance between every two workpieces on the same layer to be greater than 15 mm, ensuring the workpieces in the same furnace to be the same in size to the greatest extent, prolonging heating time while mixed loading is needed if sizes of the workpieces are different, and enabling the workpieces to obtain sufficient heat exchange balance; and setting various process parameters for the glow ion nitriding system, wherein surface hardness of a nitriding layer of the spring plunger rod (piston rod) treated by the glow ion nitriding system is greater than 1000 HV, wear resistance of the plunger rod can be improved, and the service life of the plunger rod of the nitrogen gas spring can be prolonged.

Description

technical field [0001] The invention relates to material heat treatment technology, in particular to a heat treatment process for a nitrogen spring plunger rod (piston rod). Background technique [0002] With the vigorous development of the automobile and home appliance industries, the application of stamping dies and large plastic molds to nitrogen springs is becoming more and more extensive, and the requirements for the stability and service life of nitrogen springs are getting higher and higher. The wear resistance and smoothness of the rod (piston rod) put forward higher requirements. [0003] At present, the nitrogen spring generally adopts the process of bearing steel (such as GCr15, 42CrMo) + surface treatment (gas nitriding or PVD). Gas nitriding is easy to produce nitrogen white layer and peel off the surface, which will damage the seal and affect the service life. Although the PVD treatment has a high surface hardness and improves wear resistance, but due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
CPCC23C8/38
Inventor 李小兰
Owner DONGGUAN XINYUE MOLD
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