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Heat treatment technology of iron casting for compressors

A technology for iron castings and compressors, which is applied in the field of heat treatment of iron castings for compressors, can solve the problems of low strength, impact toughness, corrosion resistance and wear resistance, uneven structure, and low production capacity of iron castings, and achieves The effect of shortening heat treatment time, improving comprehensive properties, and removing residual stress

Inactive Publication Date: 2013-07-31
CHANGSHU MIAOQUAN COMPRESSOR ACCESSORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing iron castings, the heat treatment process takes a long time, the energy consumption is high, resulting in low production capacity, and the annealing temperature is too high, so that the structure obtained by heat treatment is not uniform, resulting in the strength, impact toughness, corrosion resistance and resistance of the iron castings. Low abrasiveness, unable to meet the use conditions of compressor accessories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A heat treatment process for iron castings for compressors, including low-temperature annealing, quenching and high-temperature tempering. The low-temperature annealing process is: heating up to 600°C at a heating rate of 45°C / hour, keeping the temperature for 4 hours, and then heating at 55°C / hour The cooling rate of 1 hour is air-cooled to below 160°C; the quenching process is: heating up to 930°C at a heating rate of 75°C / hour for 5 hours, and then cooling to below 160°C with the furnace; the tempering process is: The heating rate of °C / hour is to raise the temperature to 470 °C for 3 hours, and then cool down to below 160 °C with the furnace.

Embodiment 2

[0016] A heat treatment process for iron castings for compressors, including low-temperature annealing, quenching and high-temperature tempering. The low-temperature annealing process is: heating up to 610°C at a heating rate of 40°C / hour, holding the temperature for 4 hours, and then heating at 50°C / hour The cooling rate of 1 hour is air-cooled to below 160°C; the quenching process is: heating up to 920°C at a heating rate of 80°C / hour for 5 hours, and then cooling to below 160°C with the furnace; the tempering process is: The heating rate of °C / hour is to raise the temperature to 490 °C for 3 hours, and then cool down to below 160 °C with the furnace.

[0017] The heat treatment process of the iron castings for compressors of the present invention can shorten the heat treatment time by more than 50%. At the same time, the strength of the iron castings produced can be increased by about 15%, the impact toughness can be increased by more than 5%, and the energy consumption can ...

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PUM

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Abstract

The invention discloses a heat treatment technology of an iron casting for compressors. The technology includes low temperature annealing, quenching and high temperature tempering. The low temperature annealing process comprises: raising the temperature to 590-610DEG C, conducting heat preservation for 3.5-4.5h, and then performing air cooling to less than 160DEG C. The quenching process consists of: raising the temperature to 920-940DEG C, carrying out heat preservation for 4.5-5.5h, and then performing furnace cooling to less than 160DEG C. The tempering process comprises: raising the temperature to 460-490DEG C for 3-4h, carrying out heat preservation for 3-4h, and then conducting furnace cooling to less than 160DEG C. By the means, the residual stress can be fully removed, comprehensive performance of the iron casting can be improved, so that the iron casting can have high strength, impact toughness, corrosion resistance and wear resistance, and the production efficiency of heat treatment is also enhanced.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a heat treatment process for iron castings used in compressors. Background technique [0002] Compressor is a driven fluid machine that raises low-pressure gas to high-pressure. It is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, and drives the piston to compress it through the operation of the motor. The air pipe discharges high-temperature and high-pressure refrigerant gas to provide power for the refrigeration cycle, thereby realizing the refrigeration cycle of compression-condensation-expansion-evaporation (heat absorption). Its accessories mainly include: cylinders, cylinder heads, crankshafts, connecting rods, piston rods, etc., all of which are made of cast iron parts, which need to have excellent strength, impact toughness, corrosion resistance and wear resistance. [0003] Existing iron castings, the...

Claims

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Application Information

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IPC IPC(8): C21D5/00C21D11/00
Inventor 顾建青
Owner CHANGSHU MIAOQUAN COMPRESSOR ACCESSORIES
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