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Damper piston and manufacturing process thereof

A preparation process and technology for shock absorbers, applied in shock absorbers, springs/shock absorbers, shock absorbers, etc. The tolerance and accuracy of parts are difficult to meet the technical requirements, and the product standard requirements cannot be met, so as to achieve the effect of fewer preparation process steps, improved hardness and wear resistance, and reduced production costs.

Inactive Publication Date: 2017-12-29
NINGBO RUIFENG AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional automobile shock absorber piston is made of zinc alloy die-casting, machined, turned, cleaned and packaged. The disadvantage is that the tolerance accuracy of the die-casting parts is difficult to meet the technical requirements, and machining is required to ensure the concentricity, verticality and Seal ring size for piston outer diameter
The traditional production process is not only complex, labor-intensive and energy-intensive, but also often fails to meet product standard requirements
At the same time, the thread of the screw connecting the piston and the connecting rod is also prone to loosening in the long-term reciprocating motion, which has potential safety hazards and serious safety accidents.
[0005] In view of the disadvantages of traditional zinc alloy shock absorber pistons such as low hardness and non-wear resistance, Chinese patent (ZL201210415179.8) discloses a shock absorber piston rod made of iron-based powder metallurgy, which improves the product air density and product density
However, iron-based powder metallurgy cannot solve the problems of shock absorber piston hardness, wear resistance and crush strength.

Method used

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  • Damper piston and manufacturing process thereof
  • Damper piston and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Ingredients: raw materials are weighed according to the composition and mass percentage of the piston in claim 1, 40% of tin-containing bronze powder, 1% of carbon powder, 1% of manganese sulfide, 0.25% of cerium dioxide, 4% of boron carbide, and the balance is iron . Grind the weighed materials into powder respectively, wherein the tin bronze powder has a particle size of 180 mesh, and the iron powder has a particle size of 120 mesh, and then put the powder into a mixer and stir for 1 hour to obtain a mixture. Put the mixed material into a powder metallurgy mold, and keep it under 750MPa pressure for 2 minutes to obtain a piston blank.

[0033] Sintering: Send the piston blank through the sintering mesh into a sintering furnace filled with protective gas for sintering, sintering at 1000°C for 1.5h, and finally cooling down to room temperature at a constant speed of 4°C / min to obtain the product. First, the sintered and cooled products are sent to the oil immersion mac...

Embodiment 2-3

[0036] The only difference from Example 1 is that the content of the ingredient ceria in Examples 2-3 is respectively 0.2% and 0.3%.

Embodiment 4-6

[0038] The only difference from Example 1 is that the contents of boron carbide in the ingredients in Examples 4-6 are 3%, 5%, and 6%, respectively.

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Abstract

The invention discloses a damper piston and a manufacturing process thereof, and belongs to the technical field of powder metallurgy. The damper piston comprises raw materials including, by percentage composition, 36%-45% of tin bronze powder, 0.5%-1.3% of carbon dust, 0.5%-1.0% of manganese sulfide, 0.2%-0.3% of ceric oxide, 3%-6% of boron carbide and the balance iron powder. According to the raw material ratio, the proportion of the tin bronze powder to the proportion of the carbon dust approximates 1:1, iron-copper-base powder metallurgy is achieved, and the beneficial effects of iron-base powder metallurgy and copper-base powder metallurgy are achieved; and meanwhile, boron carbide is added, the product friction coefficient is increased, ceric oxide refined grains are added, the conquassation strength, hardness, antifriction performance and abrasive resistance of the materials are improved. Finally, a finished product is obtained through one-time sinter molding and surface treatment.

Description

technical field [0001] The invention relates to a shock absorber piston, in particular to a powder metallurgy shock absorber piston and a preparation process thereof, belonging to the technical field of powder metallurgy. Background technique [0002] Piston, as an essential accessory in a car, plays a big role in a car. A shock absorber is usually installed in the automobile suspension system, and the piston, as an essential component of the shock absorber, keeps reciprocating in the shock absorber cylinder to control the opening and closing of the flow inside. Frequent reciprocating motion inevitably requires the piston to have the characteristics of high wear resistance and high density. As a mature technology, powder metallurgy has provided great help in the production of auto parts. [0003] Powder metallurgy is a process technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sinteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/24C22C33/02C22C30/04C22C32/00C22C38/16F16F9/32
CPCB22F5/00B22F3/24B22F2003/241B22F2998/10B22F2999/00C22C30/02C22C30/04C22C32/0005C22C33/0221C22C33/0228C22C33/0278C22C33/0292C22C38/008C22C38/16F16F9/32B22F3/02B22F3/10B22F2201/05
Inventor 邬建尧
Owner NINGBO RUIFENG AUTO PARTS
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