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Manufacturing method of compressor piston and compressor piston

A manufacturing method and compressor technology, which is applied in the field of compressors, can solve the problems of high cost and increased cost, and achieve the effects of improving surface hardness, improving wear resistance, and reducing costs

Pending Publication Date: 2021-03-30
ANHUI MEIZHI PRECISION MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventors of the present application found in the long-term research process that the cost of traditional gray cast iron containing nickel, chromium and molybdenum elements is relatively high, and the subsequent process to improve its wear resistance will further increase its cost

Method used

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  • Manufacturing method of compressor piston and compressor piston
  • Manufacturing method of compressor piston and compressor piston
  • Manufacturing method of compressor piston and compressor piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, the gray cast iron casting with the grade HT250 is roughly machined to form a semi-finished piston; then the semi-finished piston is subjected to carbonitriding / carburizing and quenching treatment, and the treatment temperature for carbonitriding / carburizing and quenching is 900°C , the carbon potential is 1.1%, and the carburizing time is 4 hours; then the semi-finished piston is tempered at a low temperature, the holding temperature is 200°C, and the holding time is 3 hours; finally, the semi-finished piston is finished after heat treatment to form The finished piston, at this time, the surface hardness of the finished piston is 50±3HRc.

Embodiment 2

[0043] First, the iron-based powder metallurgy material is directly sintered into a piston semi-finished product through a grinding tool. The chemical composition (weight %) of the iron-based powder metallurgy is as follows: C0.8%, Cu1.6%, Fe balance, and the density of the pressed piston semi-finished product 7.1cm 2 / g; Carry out carbonitriding treatment / carburizing quenching treatment to this piston semi-finished product then, the treatment temperature of carbonitriding treatment / carburizing quenching treatment is 880 ℃, carbon potential is 1.1%, and carburizing time is 4 hours; Then the semi-finished piston is subjected to low-temperature tempering treatment, the holding temperature is 200°C, and the holding time is 3 hours; finally, the semi-finished piston that has been heat-treated is processed to form a finished piston. At this time, the surface hardness of the finished piston is 50±3HRc .

[0044] see Figure 2-Figure 3 , figure 2 It is a structural schematic diag...

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Abstract

The invention provides a manufacturing method of a compressor piston and the compressor piston. The manufacturing method comprises the steps that a base material is machined to form a semi-finished piston, and the base material is an iron-based powder metallurgy material or gray cast iron without nickel, chromium and molybdenum; the semi-finished piston is subjected to heat treatment, and the heattreatment comprises carbonitriding treatment and low-temperature tempering treatment or carburizing and quenching treatment and low-temperature tempering treatment; and the semi-finished piston subjected to heat treatment is machined to form a finished piston. According to the manufacturing method of the compressor piston, the piston which is low in cost and meets the abrasion resistance requirement can be developed.

Description

technical field [0001] The present application relates to the technical field of compressors, in particular to a method for manufacturing a compressor piston and a compressor piston. Background technique [0002] The piston is one of the key components of the rotary compressor. The rotation of the piston can drive the volume change of the refrigerant in the two cavities of the cylinder. Since the piston is always in contact with the tip of the sliding plate, the piston is required to have high wear resistance, air tightness and small thermal expansion coefficient. Traditional pistons use gray cast iron containing nickel-chromium-molybdenum elements, and the wear resistance of the piston surface is generally improved by reducing or removing nickel-chromium-molybdenum elements in nickel-chromium-molybdenum gray cast iron and by improving the heat treatment process. [0003] The inventors of the present application have discovered during long-term research that traditional gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C29/00C22C37/10C22C38/16C22C38/08C22C38/12C22C38/18C22C38/22C22C38/20C22C38/44C22C38/42C21D9/00C21D1/18C23C8/00C23F17/00
CPCF04C29/00C22C37/10C22C38/16C22C38/08C22C38/12C22C38/18C22C38/22C22C38/20C22C38/44C22C38/42C21D9/0068C21D1/18C23C8/00C23F17/00F04C2240/20F04C2230/41F04C2230/92
Inventor 李海成龙春仙
Owner ANHUI MEIZHI PRECISION MFG
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