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Camshaft heat treatment process for general machinery

A general-purpose machine and camshaft technology, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of inability to effectively guarantee the strength and hardness of camshafts, simple heat treatment process, and insignificant quenching and tempering effects, reducing Generation of cracks and defects, improved overall properties, strength and hardness enhancement

Inactive Publication Date: 2021-06-08
张会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the overall process achieves part of the heat treatment of the camshaft, the entire heat treatment process is too simple, resulting in ineffective quenching and tempering effects, and it is impossible to effectively guarantee the strength and hardness of the camshaft in a real sense.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A camshaft heat treatment process for general machinery, comprising the following steps:

[0028] S1: Put the produced camshaft into the annealing machine, start the annealing machine, control the annealing temperature at 800°C-900°C, control the heating time at 2-3h, control the holding time at 3-5h, and complete the annealing work ;

[0029] S2: Then, introduce the camshaft into the quenching furnace and start the quenching furnace so that the quenching temperature is AC3+30~50°C, and the quenching method is water quenching and oil cooling. When the temperature drops below the martensitic transformation temperature (about 200-300°C), put it in oil for cooling, the quenching time is controlled at 2-4h, and tempering is 4-5h;

[0030] S3: Control the tempering temperature so that it is controlled at 350-450°C, and the holding time is controlled at 1-2h;

[0031] S4: In the tempering process, high-intensity quenching and tempering treatment is carried out, that is, the...

Embodiment 2

[0034] A camshaft heat treatment process for general machinery, comprising the following steps:

[0035] S1: Put the produced camshaft into the annealing machine, start the annealing machine, control the annealing temperature at 800°C-900°C, control the heating time at 2-3h, control the holding time at 3-5h, and complete the annealing work ;

[0036] S2: Then, introduce the camshaft into the induction hardening machine, start the induction hardening machine, control the induction frequency at 2500-8000Hz, control the quenching temperature at AC3+30-50°C, and use water quenching as the quenching method. During quenching, When the quenching temperature reaches AC3+30~50℃, spray water to cool, and the temperature after cooling is controlled at 150℃-200℃, the quenching time is controlled at 2-4h, and tempering is 4-5h;

[0037] S3: Control the tempering temperature so that it is controlled at 350-450°C, and the holding time is controlled at 1-2h;

[0038] S4: In the tempering pr...

Embodiment 3

[0041] A camshaft heat treatment process for general machinery, comprising the following steps:

[0042] S1: Put the produced camshaft into the annealing machine, start the annealing machine, control the annealing temperature at 800°C-900°C, control the heating time at 2-3h, control the holding time at 3-5h, and complete the annealing work ;

[0043] S2: Then, introduce the camshaft into the induction hardening machine, start the induction hardening machine, control the induction frequency at 2500-8000Hz, control the quenching temperature at AC3+30-50°C, and use water quenching as the quenching method. During quenching, When the quenching temperature reaches AC3+30~50℃, spray water to cool, and the temperature after cooling is controlled at 150℃-200℃, the quenching time is controlled at 2-4h, and tempering is 4-5h;

[0044] S3: Control the tempering temperature so that it is controlled at 350-450°C, and the holding time is controlled at 1-2h;

[0045] S4: In the tempering pr...

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PUM

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Abstract

The invention discloses a camshaft heat treatment process for general machinery, and relates to the technical field of camshaft heat treatment. The camshaft heat treatment process aims to solve the problems about the quenching and tempering effects of a camshaft. The camshaft heat treatment process specifically comprises the following steps that a produced camshaft is put into an annealing machine, the annealing machine is started, the annealing temperature is controlled to be 800-900 DEG C, the heating time is controlled to be 2-3 h, the heat preservation time is controlled to be 3-5 h, and annealing work is completed; and then, the camshaft is guided into a quenching furnace, the quenching furnace is started, the quenching temperature is made to be AC3 + 30-50 DEG C, the quenching manner is water quenching and oil cooling, during quenching, a workpiece is firstly put into water to be cooled rapidly, when the temperature is reduced to be lower than the martensite transformation temperature, the workpiece is put into oil to be cooled, and the quenching time is controlled to be 2-4 h. When the annealing temperature reaches 860 DEG C and the heat preservation time reaches 4.5 h, the follow-up plasticity effect is optimal, and meanwhile the production cost is the lowest.

Description

technical field [0001] The invention relates to the technical field of camshaft heat treatment, in particular to a camshaft heat treatment process for general machinery. Background technique [0002] Heat treatment is a thermal processing process in which metal materials are heated, kept warm and cooled in a certain medium to change the overall or surface structure of metal materials, and finally obtain the desired properties. Compared with other processing techniques, metal heat treatment generally does not change the overall chemical composition, shape and size of the workpiece, but changes its structure or surface chemical composition. There are many types of heat treatment processes, mainly including: ordinary heat treatment, such as four fires, namely annealing, normalizing, quenching, tempering; and surface heat treatment, such as chemical heat treatment (carburizing, nitriding, carbonitriding) and Surface hardening (flame heating surface hardening, induction heating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/30C21D1/26C21D1/18C21D1/25C21D1/60C21D6/00
CPCC21D9/30C21D1/26C21D1/18C21D1/25C21D1/60C21D6/00C21D2211/009
Inventor 张会
Owner 张会