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Correction process for adjusting heat treatment deformation of an arm lever portion

A heat treatment deformation and arm adjustment technology, applied in the mechanical field, can solve deformation, cracking and other problems, achieve the effect of simple process operation, improve work efficiency, prevent oxidation and decarburization

Inactive Publication Date: 2019-01-15
NANJING OURUI MACHINERY FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment arm may be deformed or even cracked during the heating and cooling process of heat treatment. The reason is due to the existence of quenching stress. Quenching stress is divided into two types: thermal stress and tissue stress. Parts produce different residual stresses, which may cause deformation. In view of this, it is necessary to study a heat treatment deformation correction process for the adjustment arm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adjusting the heat treatment deformation correction process of the arm part includes the following steps:

[0023] S1. Place the deformed product in a container filled with a cooling medium for cooling. During the cooling process, slowly add new cooling medium to the container at a rate of 5Kg / min. The cooling medium is oil at a temperature of 70°C. During the process, the inside of the container is continuously stirred at a stirring speed of 50 rpm until the product reaches the martensitic temperature and is completely cooled, then taken out and air-dried for later use;

[0024] S2. Put the product into the salt bath furnace and immerse in the salt solution. The salt solution is sodium chloride solution. The temperature of the salt bath furnace is set to 110°C, and the heating treatment is started. After the heating is completed, the product is quickly put into the press for processing. Correction;

[0025] S3. Put the calibrated product into the material frame, and b...

Embodiment 2

[0029] Adjusting the heat treatment deformation correction process of the arm part includes the following steps:

[0030] S1. Place the deformed product in a container filled with cooling medium for cooling, and slowly add new cooling medium to the container during the cooling process, the addition amount is 8Kg / min, and the cooling medium is oil at a temperature of 85°C. During the cooling process, continuously stir the inside of the container at a stirring speed of 60 rpm until the product reaches the martensitic temperature and cool completely, take it out and air dry it for use;

[0031] S2. Put the product into the salt bath furnace and immerse in the salt solution. The salt solution is potassium chloride solution. The temperature of the salt bath furnace is set to 120°C, and the heating treatment is started. After the heating is completed, the product is quickly put into the press for processing Correction;

[0032] S3. Put the calibrated product into the material frame...

Embodiment 3

[0036] Adjusting the heat treatment deformation correction process of the arm part includes the following steps:

[0037] S1. Place the deformed product in a container filled with a cooling medium for cooling. During the cooling process, slowly add new cooling medium to the container at a rate of 7Kg / min. The cooling medium is oil at a temperature of 75°C. During the process, the inside of the container is continuously stirred at a stirring speed of 55 rpm until the product reaches the martensitic temperature and is completely cooled, then taken out and air-dried for later use;

[0038] S2. Put the product into the salt bath furnace and immerse it in the salt solution. The salt solution is barium chloride solution. The temperature of the salt bath furnace is set to 11°C, and the heating treatment is started. After the heating is completed, the product is quickly put into the press for processing. Correction;

[0039] S3. Put the calibrated product into the material frame, and...

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PUM

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Abstract

The invention discloses a correction process for adjusting heat treatment deformation of an arm lever portion. The correction process comprises the steps of: placing a deformed product in a containercontaining a cooling medium for cooling until the product reaches the martensite temperature and is cooled completely, taking out the product and air-drying the product for later use, putting the product into a salt bath furnace, starting the heat treatment, after the heated finished product is taken out the furnace, quickly putting the product into a press for correction; putting the corrected product into a material frame, and bringing the material frame vertically into a cold water tank; putting the product into the salt bath furnace again, starting the secondary heat treatment, after the heated finished product is taken out the furnace, quickly putting the product into a press for secondary correction; then vertically putting the corrected product into the cold water tank again, takingthe product out and drying the product to complete the correction work. The correction process can improve the overall correction quality and accuracy and improve work efficiency.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a process for correcting heat treatment deformation of an adjusting arm rod. Background technique [0002] The function of the automatic adjustment arm is to accurately record the increase in the clearance caused by the wear of the friction lining, and accurately adjust the brake clearance to the normal working range. When starting to brake, the adjustment arm drives the camshaft to rotate through the clearance angle and the excess clearance angle , and accurately record the resulting wear. At this time, the angular travel of the cam is in the clearance area. The characteristic of the clearance area is that the braking torque changes little. When braking continues, the angular travel of the cam enters the elastic deformation area, and the braking torque rises sharply until the vehicle stops Hold, release the pedal, the brake returns, the braking torque decreases, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/10B21D37/16C21D1/46
CPCB21D3/10B21D37/16C21D1/46
Inventor 黄世宽
Owner NANJING OURUI MACHINERY FORGING CO LTD
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