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Automobile damper compression valve seat and preparation method thereof

A technology of automobile shock absorber and compression valve, which is applied in the direction of shock absorber, spring/shock absorber, shock absorber, etc., can solve the problems of shock absorber force value hysteresis, poor impact resistance, easy deformation, etc. Achieve the effect of increasing roughness and specific surface area, improving tensile strength and heat resistance, improving toughness and strength

Inactive Publication Date: 2018-01-19
NINGBO RUIFENG AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional compression valve seat is formed by die-casting of zinc alloy, which is finished after machining, drilling, cleaning and packaging. However, the zinc alloy itself has low hardness, is easy to deform, and has poor impact resistance, so the surface roughness of the Vaille line after machining is not smooth. , when the valve line is in contact with the valve plate, due to the low hardness and roughness, the compression force value of the shock absorber is likely to be unstable and fail
In addition, the width of the valve seat's valve seat is directly in contact with the valve plate, and the valve's width is directly formed by machining. In the process of processing, the error is relatively large, between ±0.15, resulting in a gap between the valve plate and the valve plate. There will be a difference in the opening and closing time, resulting in hysteresis in the force value of the shock absorber
Due to the low precision of zinc alloy mold forming, the relevant important dimensions must be completed by machining, the process is more complicated, and the energy consumption is high

Method used

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  • Automobile damper compression valve seat and preparation method thereof
  • Automobile damper compression valve seat and preparation method thereof
  • Automobile damper compression valve seat and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-6

[0038] The automobile shock absorber compression valve seat in embodiment 1-6 is sintered by the raw material of following mass percent: colloidal graphite powder 2.0-3.0%, copper powder 2.5-3.5%, nickel powder 0.5-2.0%, silicon powder 6- 8%, titanium powder 2.5-3.0%, molybdenum sulfide powder 1.3-2.6%, modified glass fiber 2.6-5.3%, zinc stearate 0.3-0.6%, and the balance is iron powder.

[0039] The particle size of copper powder, nickel powder, silicon powder, titanium powder, molybdenum sulfide powder and iron powder is 30-50 μm. The modified glass fiber has a length of 0.8-2.0mm and a diameter of 5-8μm. The preparation method of the modified glass fiber is as follows: after plasma treatment of the glass fiber, at least partially coat the surface of the glass fiber with a reinforcement layer, the material of the reinforcement layer is carbon nanofiber, the voltage during the plasma treatment is 13-20kV, and the voltage The frequency is 40-50kHz, the time is 80-120s, and t...

Embodiment 7

[0048] The preparation method of automobile shock absorber compression valve seat in the present embodiment comprises the following steps:

[0049] (1) batching, batching is carried out by the mass percentage of raw material in embodiment 3, earlier colloidal graphite powder, copper powder, nickel powder, silicon powder, titanium powder, molybdenum sulfide powder, modified glass fiber and zinc stearate are pressed Add the ratio to 1 / 3 weight of iron powder, mix at a speed of 20 rpm for 60 minutes, then add another 2 / 3 of the weight of iron powder, and mix for 90 minutes at a speed of 20 rpm to obtain a raw material powder after mixing .

[0050] (2) Compression, mix the raw material powder at 43T / cm 2 Pressed into a green body under pressure;

[0051] (3) Sintering, place the green body in a sintering furnace, fill with protective gas for sintering, first raise the temperature to 600°C at a rate of 3°C / min for sintering for 2.5h, and then increase to 1050°C at a rate of 6°C / ...

Embodiment 8

[0055] The preparation method of automobile shock absorber compression valve seat in the present embodiment comprises the following steps:

[0056] (1) batching, batching is carried out by the mass percentage of raw material in embodiment 3, earlier colloidal graphite powder, copper powder, nickel powder, silicon powder, titanium powder, molybdenum sulfide powder, modified glass fiber and zinc stearate are pressed Add the proportion to 1 / 3 weight of iron powder, mix at a speed of 21 rpm for 55 minutes, then add another 2 / 3 of the weight of iron powder, and mix for 85 minutes at a speed of 21 rpm to obtain a raw material powder after mixing .

[0057] (2) Compression, mix the raw material powder at 44T / cm 2 Pressed into a green body under pressure;

[0058] (3) Sintering, place the green body in a sintering furnace, fill with protective gas for sintering, first raise the temperature to 610°C at a rate of 3°C / min for sintering for 2.5 hours, and then rise to 1060°C at a rate o...

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Abstract

The invention relates to an automobile damper compression valve seat and a preparation method thereof and belongs to the technical field of powder metallurgy. The automobile damper compression valve seat is formed by sintering the following raw materials in percentage by mass: 2.0-3.0% of aquadag powder, 2.5-3.5% of copper powder, 0.5-2.0% of nickle powder, 6-8% of ganister sand, 2.5-3.0% of titanium powder, 1.3-2.6% of molybdenum sulfide powder, 2.6-5.3% of modified glass fiber, 0.3-0.6% of zinc stearate and the balance of iron powder. The automobile damper compression valve seat has the advantages of being high in strength, resisting shock and small in deformation.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a compression valve seat of an automobile shock absorber and a preparation method thereof. Background technique [0002] The shock absorber is a vulnerable part during the use of the car. Its main function is that when the body and the axle or the wheel and the body are in relative motion due to vibration, the shock absorber moves the pressure oil in it repeatedly through the up and down movement of its internal piston. The ground flows from the shock absorber working cylinder through different orifices into the shock absorber oil storage cylinder. At this time, the friction between the hole wall and the hydraulic oil and the internal friction between the hydraulic oil molecules form a damping force on the vibration, so that the vibration energy of the vehicle is converted into heat energy of the oil, which is then absorbed by the shock absorber and released into the atmo...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F5/00C22C49/08C22C49/14F16F9/34
Inventor 邬建尧
Owner NINGBO RUIFENG AUTO PARTS
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