Processing, formation and manufacturing method of piston rod using 38CrMoAlA steel as materials

A piston rod and powder technology, which is applied in the field of powder metallurgy, can solve the problems of heavy weight of the piston rod itself, reduce the operating rate of the compressor, and high power requirements of the equipment, so as to reduce the content of impurities, eliminate work hardening, and work with high reliability. Effect

Inactive Publication Date: 2012-07-04
无锡市万邦机械制造厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of split piston rod is that it needs to repeat the same processing procedure to complete the processing of parts, the production cost of the product is high, and the piston rod is made of solid parts, so the amount of materials required for processing is large and the cost is high. The weight of the piston rod itself is large, and the corresponding power requirements for the equipment are also high, and the energy loss is large when the user uses it.
Therefore, the life of the general piston rod is relatively short, and the piston rod needs to be replaced or repaired, which reduces the operating rate of the compressor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A method for processing and forming a piston rod made of 38CrMoAlA steel, the percentage content of the elements included in the piston rod material: Mn 0.7%, C 0.5%, Si 0.5%, Cr 0.5%, Al 1.2%, Ni<0.003 %, Ti<0.02%, S<0.03%, V0.01%-0.04%, its processing technology: (1) Preparation of powder: pretreat the powder, first anneal the powder, the annealing temperature is 210°C , and then classify the powder raw materials, mix the various powders uniformly, and use the floating die pressing method to press-demould the powder, (2) sinter the pressed piston rod blank, and the sintering temperature is: 1050 ℃, sintering time: 1h, slow cooling in air. (3) Perform homogenization annealing treatment on the powder-formed piston rod, heat it to 800-1250°C, keep it warm for 10-15h, slowly cool it to 600°C in the furnace, and then quickly air-cool it. (4) Drill and process the center holes at both ends, rough the outer circle of the bar, and add a tool rest during turning to avoid defo...

Embodiment 2

[0011] A manufacturing method for processing and forming a piston rod made of 38CrMoAlA steel, the percentage content of elements included in the piston rod material: Mn 1.2%, C 1.5%, Si 1.3%, Cr1.2%, Al1.3%, Ni <0.003%, Ti<0.02%, S<0.03%, V0.01%-0.04%. Its processing technology: (1) Preparation of powder: pretreat the powder, first anneal the powder, the annealing temperature is 250°C, then classify the powder raw materials, mix all kinds of powder evenly, adopt floating die The powder is pressed and demolded by the press forming method, and (2) the press formed piston rod blank is sintered at a sintering temperature of 1200° C. for 2 hours, and slowly cooled in air. (3) Perform homogenization annealing treatment on the powder-formed piston rod, heat it to 1250°C, keep it warm for 15h, slowly cool it to 600°C in the furnace, and then quickly air-cool it. (4) Drill and process the center holes at both ends, rough the outer circle of the bar, and add a tool rest during turning...

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Abstract

The invention discloses a processing, formation and manufacturing method of a piston rod using 38CrMoAlA steel as a material, which belongs to the technical field of powder metallurgy. A gear is realized through the following work procedures of baiting, powder metallurgical blank manufacture, annealing, tongs center emptying, rough turning, tempering, fine turning, center hole accurate grinding, hexagon milling and nitriding treatment. The piston rod manufactured by the manufacture method does not deform at high temperature and high pressure, the surface hardness is high, the abrasion performance is good, the bending resistance capability is high, the fatigue strength is high, in addition, the center roughness is good, the service life is long, the work reliability is high, and because blanks are manufactured by the powder metallurgy, the high-temperature resistance is good.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to materials and piston rods thereof. In particular, the invention relates to a method for processing and forming a piston rod made of 38CrMoAlA steel. Background technique [0002] Most of the currently used piston rod blanks are made by casting, which determines that it has many trachoma and the area of ​​trachoma is not fixed, so the scrap rate is high. The piston rod plays a role in transmitting power during work, and it needs to bear alternating loads, so it is required It has good mechanical properties, and at the same time, the sealing packing rubs against each other on the piston rod, so the piston rod is required to have good wear resistance. The piston rod needs to be in contact with corrosive media in many occasions, so the piston rod needs to have better corrosion resistance. Existing piston rod comprises piston body and piston head, is connected with nut between the two....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/28C22C38/46C22C38/50B22F3/16B22F3/24B22F1/00C21D1/26F16J7/00
CPCY02P10/20
Inventor 胡春涛
Owner 无锡市万邦机械制造厂
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