Heat treatment process for GCr15 piston
A piston and process technology, applied in the field of GCr15 piston heat treatment process, can solve problems such as affecting the performance of the piston, shallow hardened layer, etc., and achieve the effects of reducing the failure rate, rationally arranging steps, and increasing economic benefits.
Inactive Publication Date: 2014-09-03
安徽旭虹机械设备有限公司
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- Abstract
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- 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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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0021] Embodiment one: set the cooling time T in step 2) 1 is 120s, set the cooling time T in step 3) 2 Control at 300s, set the cooling time T in step 4) 3 1800s, the hardness of the manufactured GCr15 piston reaches HRC58, and there is no cracking on the surface.
Embodiment 2
[0022] Embodiment two: set the cooling time T in step 2) 1 is 150s, set the cooling time T in step 3) 2 Control at 330s, set the cooling time T in step 4) 3 The hardness of the manufactured GCr15 piston reaches HRC59, which meets the technical requirements of the piston, and there is no cracking on the surface of the piston after testing.
Embodiment 3
[0023] Embodiment three: set the cooling time T in step 2) 1 is 180s, set the cooling time T in step 3) 2 Control at 360s, set the cooling time T in step 4) 3 The hardness of the manufactured GCr15 piston reaches HRC60.3, which meets 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 heat treatment process for a GCr15 piston. The process comprises the following steps: 1) heating and insulating; 2) air precooling; 3) cooling by saline; 4) oil cooling; 5) tempering. The process provided by the invention has the advantages of reasonable step arrangement, proper parameter selection, convenience in production and manufacturing and the like. Single oil cooling in the past is changed to saline and oil cooling, and the surface hardness of the GCr15 piston improved by the process reaches HRC58-61 which meets the technical requirements of the piston. The failure rate of the products is greatly reduced, the process is safe and reliable, the production output of the GCr15 pistons of enterprises is improved and the economical benefit is 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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IPC IPC(8): C21D9/00C21D1/18C21D1/06C21D6/00
Inventor 周玉豹
Owner 安徽旭虹机械设备有限公司