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GCr15 piston heat treatment process

A piston and process technology, which is applied in the field of GCr15 piston heat treatment process, can solve the problems affecting the performance of the piston, shallow hardened layer, etc., and achieve the effects of reduced failure rate, reasonable step arrangement, and increased production output

Inactive Publication Date: 2018-06-12
QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical requirements for heat treatment of pistons made of GCr15: HRC58-62. For such workpieces, heat treatment processes are usually used: heating, heat preservation and oil cooling. The hardness of the piston after treatment is only HRC45-50, and the hardened layer is shallow, lower than that of the piston. Technical requirements, can not be used at all, and affect the performance of the piston

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: the cooling time T1 in the setting step 2) is 120s, the cooling time T2 in the setting step 3) is controlled at 300s, the cooling time T3 in the setting step 4) is 1800s, and the GCr15 piston hardness of making Reach HRC58, no cracking phenomenon on the surface.

Embodiment 2

[0022] Embodiment two: the cooling time T1 in the setting step 2) is 150s, the cooling time T2 in the setting step 3) is controlled at 330s, the cooling time T3 in the setting step 4) is 2500s, and the GCr15 piston hardness of making Reaching HRC59 means meeting the technical requirements of the piston, and there is no cracking on the surface of the piston after testing.

Embodiment 3

[0023] Embodiment three: the cooling time T1 in the setting step 2) is 180s, the cooling time T2 in the setting step 3) is controlled at 360s, the cooling time T3 in the setting step 4) is 3000s, and the GCr15 piston hardness of making Reaching HRC60.3 means meeting the technical requirements of the piston, and there is no cracking on the surface of the piston after testing.

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Abstract

The invention relates to a GCr15 piston heat treatment process. The GCr15 piston heat treatment process includes the steps of (1) heating and thermal insulation, (2) air pre-cooling, (3) brine cooling, (4) oil cooling, and (5) tempering. The GCr15 piston heat treatment process has the advantages of reasonable step arrangement, proper parameter selection and convenient production and manufacture; and previous single oil cooling is changed to brine and oil double-liquid cooling, the surface hardness of a GCr15 piston after process improvement can be reached HRC58-61 which is in line with the piston technical requirements, the product failure rate is greatly reduced, safety and reliability are achieved, and the production of the GCr15 piston of companies is increased, and the economic benefitis increased.

Description

technical field [0001] The invention relates to the technical field of piston processing, in particular to a GCr15 piston heat treatment process. Background technique [0002] GCr15 is the most commonly used high-chromium bearing steel, which has high hardenability and can obtain high and uniform hardness after heat treatment. Wear resistance is better than GCr9, high contact fatigue strength, good dimensional stability and corrosion resistance, medium cold deformation plasticity, general machinability, poor weldability, sensitive to white spot formation, and has the first type of temper brittleness. It can be used to bear heavy loads, require high wear resistance, high elastic limit, high contact fatigue strength and other mechanical parts and cold stamping dies of various precision measuring tools, such as ball screws of machine tools, nozzles and plungers of turbojet engine nozzles , valves, bushings, etc. [0003] Technical requirements for heat treatment of pistons ma...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/19C21D6/00
CPCC21D9/0068C21D1/19C21D6/002
Inventor 曲立辉
Owner QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD
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