Production method of automobile wear-resisting damper piston

A shock absorber and piston technology, which is applied in the field of preparation of wear-resistant shock absorber pistons for automobiles, can solve the problems of high cost, and achieve the effects of low cost, reduced friction, and high process stability

Active Publication Date: 2015-04-01
JIANGDU LEADER POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wear-resistant materials generally use titanium carbide and tungsten carbide as hard phases, but the cost is generally high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh 95.67g of -200 mesh iron powder, 0.60g of 50μm graphite powder, 3.13g of -200 mesh ferrosilicon, 0.1g of -200 mesh copper powder, and 0.5g of zinc stearate to prepare a mixture;

[0019] (2) Put the above mixed powder into a stainless steel tank, add steel balls, the ratio of ball to material is 3:1, and mix in a rolling ball mill for 8 hours. ;

[0020] (3) Press the mixed powder into a piston blank under a pressure of 500MPa, and the compact density is 6.82 g / cm 3 ;

[0021] (4) Place the green body in H 2 Heating in the atmosphere, keeping it at 1100°C for 2 hours, the density of the sintered body is 6.82g / cm 3 ;

[0022] (5) Weigh 12g of 500nm nano-copper powder, 10g of 500nm nano-graphite powder, 16g of 5μm polytetrafluoroethylene, and 62g of lubricating oil, mix them into a lubricant, immerse the sintered body in the lubricant, vacuumize for 50min, and then take it out to get Wear-resistant shock absorber piston products.

Embodiment 2

[0024] (1) Weigh 91.07g of -200 mesh iron powder, 0.70g of 20μm graphite powder, 5.43g of 325 mesh ferrosilicon, 2.0g of 325 mesh copper powder, and 0.8g of zinc stearate to prepare a mixture;

[0025] (2) Put the above mixed powder into a stainless steel tank, add steel balls, the ratio of ball to material is 6:1, and mix in a rolling ball mill for 20 hours. ;

[0026] (3) Press the mixed powder into a piston blank under a pressure of 600MPa, and the compact density is 7.26 g / cm 3 ;

[0027] (4) Place the green body in H 2 Heating in the atmosphere, keeping it at 1200°C for 1 hour, the density of the sintered body is 7.26g / cm 3 ;

[0028] (5) Weigh 5g of 50nm nano-copper powder, 5g of 50nm nano-graphite powder, 8g of 0.5μm polytetrafluoroethylene, and 82g of lubricating oil, mix them into a lubricant, immerse the sintered body in the lubricant, vacuumize for 20min, and then take it out Obtain wear-resistant shock absorber piston products.

Embodiment 3

[0030] (1) Weigh 93.03g of -200 mesh iron powder, 0.66g of 40μm graphite powder, 4.41g of 325 mesh ferrosilicon, 1.2g of -200 mesh copper powder, and 0.7g of zinc stearate to prepare a mixture;

[0031] (2) Put the above mixed powder into a stainless steel tank, add steel balls, the ratio of ball to material is 5:1, and mix in a rolling ball mill for 15 hours. ;

[0032] (3) Press the mixed powder into a piston blank under a pressure of 550MPa, and the compact density is 7.12 g / cm 3 ;

[0033] (4) Place the green body in H 2 Heating in the atmosphere, keeping it at 1150°C for 1.5h, the density of the sintered body is 7.12g / cm 3 ;

[0034] (5) Weigh 8g of 100nm nano-copper powder, 8g of 100nm nano-graphite powder, 12g of 0.5μm polytetrafluoroethylene, and 72g of lubricating oil, mix them into a lubricant, immerse the sintered body in the lubricant, vacuumize for 40min, and then take it out Obtain wear-resistant shock absorber piston products.

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Abstract

The invention aims at providing a production method of an automobile wear-resisting damper piston. According to the method, the automobile wear-resisting damper piston is manufactured through the powder metallurgy technique and formed under relatively low pressure; a porous piston part can be obtained, then the piston part is immersed inside special lubricant, and pores can be occupied by the lubricant through the vacuum negative-pressure principles. The obtained automobile wear-resisting damper piston is low in frication force and high in wear-resistance when in work. Besides, the production method of the automobile wear-resisting damper piston is high in operating stability and repeatability, simple in equipment and application to mass production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and particularly provides a method for preparing a piston of a wear-resistant shock absorber for automobiles. technical background [0002] The shock absorber is applied to the suspension system of the automobile. When the frame (or body) and the axle are subjected to relative motion due to vibration, the piston in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly flows from One cavity flows into the other cavity through different damping holes. At this time, the friction between the damping hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into the heat energy of the oil, and then by The shock absorber absorbs emissions into the atmosphere. During the working process of the automobile shock absorber, due to the frequent movement of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/16
Inventor 葛莲芦博昕郭志猛叶青
Owner JIANGDU LEADER POWDER METALLURGY
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