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Piston rod of damper and preparation method of piston rod

A technology of piston rod and shock absorber, applied in the direction of shock absorber, spring/shock absorber, shock absorber, etc., can solve the problems of air density and product density, etc., to improve product density, improve product hardness, cost reduction effect

Active Publication Date: 2013-02-13
宁波拓发汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing publication number is CN1760573, which discloses a production method of an integral piston rod, which obtains a shock absorber piston rod by heating and stamping twice in a high-frequency furnace, so as to improve the tensile force of the piston rod, but does not solve the problem of air density. and product density issues

Method used

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  • Piston rod of damper and preparation method of piston rod

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment prepares the shock absorber piston rod in the following way:

[0037] (1) Ingredients

[0038] Select 30 parts by weight of reduced iron powder with an average particle diameter of 100 mesh, 0.5 part by weight of electrolytic copper powder with an average particle diameter of 250 mesh, 0.1 part by weight of colloidal graphite, 0.35 part by weight of zinc stearate, and 0.25 part by weight of manganese sulfide, and put them into the cone Fully mix in the conical powder mixer; then add 30 parts by weight of reduced iron powder with an average particle diameter of 100 mesh into the conical powder mixer again. The mixing time is 40 minutes to achieve a full mixing effect.

[0039] (2) Repression

[0040] Put the uniformly mixed powder into an automatic molding machine with a pressing tonnage of 50 tons for pressing.

[0041] (3) Sintering

[0042] The sintering step was performed in a mesh belt furnace; the pre-firing temperature was 750° C., and the pre-...

Embodiment 2

[0048] (1) Ingredients

[0049] Select 55 parts by weight of reduced iron powder with an average particle size of 130 mesh, 0.7 part by weight of electrolytic copper powder with an average particle size of 200 mesh, 0.06 part by weight of colloidal graphite, 0.3 part by weight of paraffin wax, and 0.35 part by weight of manganese sulfide, and put them into the conical mixing powder Mix thoroughly in the machine.

[0050] (2) Repression

[0051] Put the uniformly mixed powder into an automatic molding machine with a pressing tonnage of 30 tons.

[0052] (3) Sintering

[0053] The sintering step was performed in a mesh belt furnace; the pre-firing temperature was 800° C., and the pre-firing time was 30 minutes; the sintering temperature was 1150° C., and the sintering time was 3 hours. During the sintering process of the mesh belt furnace, the flow rate of the combustion gas hydrogen is 30 cubic meters, and the flow rate of the protective gas helium is 30 cubic meters.

[00...

Embodiment 3

[0059] 1) Ingredients

[0060] Select 70 parts by weight of reduced iron powder with an average particle diameter of 100 mesh, 0.6 part by weight of electrolytic copper powder with an average particle diameter of 180 mesh, 0.08 part by weight of colloidal graphite, 0.25 part by weight of polyvinyl chloride emulsion, and 0.3 part by weight of manganese sulfide, and put Mix thoroughly in a cone mixer.

[0061] (2) Repression

[0062] Put the uniformly mixed powder into an automatic molding machine with a pressing tonnage of 50 tons for pressing.

[0063] (3) Sintering

[0064] The sintering step was performed in a mesh belt furnace; the pre-firing temperature was 800° C., and the pre-firing time was 60 minutes; the sintering temperature was 1100° C., and the sintering time was 4 hours. During the sintering process of the mesh belt furnace, the flow rate of the combustion gas hydrogen is 30 cubic meters, and the flow rate of the protective gas helium is 40 cubic meters.

[00...

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Abstract

The invention provides a piston rod of a damper, belonging to the field of automobile accessories and solving the problem of low density of the conventional piston rod of the damper. The piston rod of the damper comprises the following components in parts by weight: 55-70 parts of reducing iron powder, 0.5-0.7 part of electrolytic copper powder, 0.06-0.1 part of colloidal graphite, 0.25-0.35 part of lubricant and 0.25-0.35 part of manganese sulfide. The invention also provides a preparation method of the piston rod of the damper. By means of rationally selecting ingredients for preparing the piston rod of the damper and utilizing a powder metallurgy method, the cost can be reduced, the product density can be improved, the dimensional tolerance of a product can be reduced, and the hardness of the product can be improved. Further, the dimensional tolerance of the product is reduced by using shaping, and the product density is further improved through water atomization steam treatment, so that the product density of the piston rod of the damper can reach 5.32-5.5 g / cm<3>.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a shock absorber piston rod and a preparation method thereof. Background technique [0002] A shock absorber is usually installed in the automobile suspension system. The shock absorber can reduce the fluctuation when the car is running, and the comfort and safety of the car can be improved through the shock absorption and buffering effect of the shock absorber. The structure of the shock absorber is to insert the piston rod with the piston into the cylinder, which is filled with oil. The piston moves in the cylinder, and the piston rod needs to enter or withdraw from the cylinder continuously with the vibration of the car. [0003] Because the piston rod of the shock absorber needs to move back and forth many times, it needs to have a good product density. At the same time, the piston is immersed in oil, so it also needs a good air density. The existing publication number is C...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/16B22F5/00C22C38/16F16F9/32
Inventor 石文光
Owner 宁波拓发汽车零部件有限公司
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