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Diaphragm spring and finger tip thermal processing process thereof

A diaphragm spring and process technology, applied in the field of diaphragm spring and its finger end heat treatment process, can solve the problems of visual transition zone, reduction of material yield limit, spring plastic deformation, etc., to reduce costs, reduce labor procedures, and color difference obvious effect

Inactive Publication Date: 2010-02-24
HUBEI DAFAN AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large deformation of the diaphragm spring during operation, the yield limit of the material in the transition zone is significantly reduced, so it is easy to cause plastic deformation of the spring
At present, the fingertip heat treatment process of the diaphragm spring is: diaphragm spring quenching, high temperature tempering, high frequency quenching of the fingertip, low temperature tempering, shot peening and fingertip polishing. After heat treatment of the diaphragm spring by this process, the obtained product The high-frequency area and the transition area of ​​the fingertips are both light white, and it is impossible to visually judge whether the length of the transition area meets the technical requirements (the technical requirements of the transition area generally do not exceed 10mm, but the transition area cannot exceed the technical requirements). The special hardness tester is fully inspected, and it is impossible for the user to disassemble the product one by one to test the length of the transition zone. Therefore, it is often necessary for the manufacturer to mark the two zones with color after obtaining the product.

Method used

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  • Diaphragm spring and finger tip thermal processing process thereof
  • Diaphragm spring and finger tip thermal processing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Heat the clean and dry diaphragm spring to 850°C in a protective atmosphere (such as nitrogen or nitrogen-methanol protective gas), keep it warm for 10 to 20 minutes, and then press and quench it with a cooling water mold (the quenching medium can also be Choose oils, emulsions, etc.).

[0015] (2) Send the quenched diaphragm spring back to the furnace and heat it to 500°C, keep it warm for 30 minutes, and then take it out of the furnace for air cooling.

[0016] (3) Shot peening is carried out on both sides of the diaphragm spring after cooling, and the shot peening time on each side is 40s (the shot material used in this embodiment is cast steel shot, and the diameter is 1.4mm, and the working air pressure is 0.5MPa, and the nozzle is connected to the workpiece. The distance is 30cm).

[0017] (4) Inductively heat the separated fingers of the diaphragm spring at 950° C. for 10 to 15 seconds at a frequency of 250 kHz, and then press-mold and quench with a mold pas...

Embodiment 2

[0020] (1) Heat the clean and dry diaphragm spring to 870°C in a protective atmosphere (such as nitrogen or nitrogen-methanol protective gas), keep it warm for 10 to 20 minutes, and then quench it with a mold passing cooling water (the quenching medium can also be Choose oils, emulsions, etc.).

[0021] (2) Send the quenched diaphragm spring back to the furnace and heat it to 550°C, keep it warm for 20 minutes, and then take it out of the furnace for air cooling.

[0022] (3) Shot peening is carried out on both sides of the diaphragm spring after cooling, and the shot peening time on each side is 40s (the shot material used in this embodiment is cast steel shot, and the diameter is 1.4mm, and the working air pressure is 0.5MPa, and the nozzle is connected to the workpiece. The distance is 30cm).

[0023] (4) Inductively heat the separated fingers of the diaphragm spring at 930° C. for 5 to 10 seconds at a frequency of 300 kHz, and then press-mold and quench with a mold passin...

Embodiment 3

[0026] (1) Heat the clean and dry diaphragm spring to 880°C in a protective atmosphere (such as nitrogen or nitrogen-methanol protective gas), keep it warm for 10 to 20 minutes, and then quench it with a mold with cooling water (the quenching medium can also be Choose oils, emulsions, etc.).

[0027] (2) Return the quenched diaphragm spring to the furnace and heat it to 600°C, keep it warm for 15 minutes, and then take it out of the furnace to cool it in air.

[0028] (3) Shot peening is carried out on both sides of the cooled diaphragm spring, and the shot peening time on each side is 40 to 60s (the shot material used in this embodiment is cast steel shot, the diameter is 1.4mm, the working air pressure is 0.5MPa, the nozzle The distance to the workpiece is 30cm).

[0029] (4) Inductively heat the separated fingers of the diaphragm spring at 920°C at a frequency of 350kHz for 5-10s, and then press-mold and quench with a mold passing through cooling water.

[0030] (5) Put t...

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Abstract

The invention discloses a diaphragm spring and a finger tip thermal processing process thereof. A finger tip high-frequency region of the diaphragm spring is pale and a transition region is blue. Thefinger tip thermal processing process sequentially comprises the following procedures: quenching the diaphragm spring, high-temperature tempering, shot blasting, high-frequency quenching at a finger tip, low-temperature tempering and polishing the finger tip. During the low-temperature tempering, the diaphragm spring is placed in a mesh-belt tempering furnace, and is insulated at a temperature of185-215 DEG C for 2-2.5h under the condition of ensuring that a mesh-belt is not moved. The length of the transition region of the product obtained by thermally processing the finger tip of the diaphragm spring by the method can be distinguished whether accords with the technical requirement or not only through visual inspection by adopting the method of the invention, the product is fully detected without a special hardmeter and is marked without color, thereby reducing the labor procedure and lowering the cost.

Description

technical field [0001] The invention relates to a diaphragm spring and its fingertip heat treatment process, in particular to a diaphragm spring with obvious color difference between the high frequency region and the transition region of the fingertip, and its fingertip heat treatment process. Background technique [0002] After the material of the diaphragm spring is heat-set, the high-frequency quenching process is usually used to increase the hardness of the surface of the separating fingertip. Therefore, there is a transition zone at the junction of the high-frequency quenching and non-high-frequency quenching parts of the fingertip. The stiffness of the transition zone is much less than the fingertip stiffness and the overall stiffness of the diaphragm spring. Because the diaphragm spring deforms greatly during operation, the yield limit of the material in the transition zone is significantly reduced, so it is easy to cause plastic deformation of the spring. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D13/71C21D9/02C21D1/18
Inventor 刘彬鲍树宏
Owner HUBEI DAFAN AUTO PARTS
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