Electronic expansion valve small shaft and cover plate and forming method

An electronic expansion valve and molding method technology, applied in valve device, refrigeration and liquefaction, lighting and heating equipment and other directions, can solve the problem of the connection between the small shaft and the cover plate being difficult to ensure verticality, etc., and achieve strong connection strength and good processing. Quality, the effect of improving production efficiency

Inactive Publication Date: 2015-05-20
福鼎市金闽辉机车部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the connection between the small shaft and the cover plate in the existing electronic expansion valve is difficult

Method used

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  • Electronic expansion valve small shaft and cover plate and forming method
  • Electronic expansion valve small shaft and cover plate and forming method
  • Electronic expansion valve small shaft and cover plate and forming method

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Embodiment Construction

[0024] Such as figure 2 As shown, the forming method of the small shaft and the cover plate of the electronic expansion valve provided in this embodiment is integrated forming by cold heading, and the specific forming process includes:

[0025] Step S1, blanking, blanking the stainless steel rod through a blanking mold to form a rod-shaped blank.

[0026] Step S2, performing surface chemical treatment on the blank, so that the surface of the blank is covered with a thin layer of porous crystal film. In this embodiment, the surface of the billet is treated with phosphate, that is, after phosphating treatment. The crystalline film can be deformed together with the blank, but will not peel off from the blank.

[0027] Step S3, coating the lubricant on the inner surface of the pre-heading station and the inner surface of the final heading station. Commonly used lubricants are liquid and solid, which can be used alone or in combination. Liquid lubricants include animal oil, ve...

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PUM

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Abstract

The invention provides an electronic expansion valve small shaft and cover plate and a forming method. A small shaft and a cover plate are integrally formed in a cold heading mode. The forming method includes the steps that blanking is conducted, blanking is conducted on a stainless steel rod through a blanking die to form a rod-shaped blank; multi-preforming is conducted, each performing includes the steps that the blank is fixed into a corresponding pre-heading station, a punch is pressed downwards to extrude metal on the blank, the metal on the blank moves and fills up the whole pre-heating station, and a semi-finished product of a small shaft and cover plate is formed after multi-preforming is conducted on the blank; final heading is conducted, the semi-finished product obtained after multi-preforming is conducted is fixed in a final heading station, and the punch is pressed downwards to extrude the semi-finished product; finally, a finished product is formed in a stamping mode, wherein the cover plate and the small shaft are vertically connected with each other, and the thickness of the cover plate obtained after final heading is conducted is the final thickness. By means of the electronic expansion valve small shaft and cover plate forming method, the perpendicularity of the formed small shaft and cover plate can be guaranteed, and the electronic expansion valve small shaft and cover plate and the forming method have the advantages of being good in finished product consistency, high in production efficiency, low in production cost and the like.

Description

technical field [0001] The invention relates to the field of refrigeration equipment, and in particular to a small shaft, a cover plate and a forming method of an electronic expansion valve. Background technique [0002] Such as figure 1 As shown, the existing electronic expansion valve includes a valve body a and a valve core b arranged in the valve body, the small shaft c and the cover plate d are welded together, and the small shaft c is sleeved with a spring e, which can be controlled within a certain limit. The relevant components in the valve body a drive the valve core b to move up and down in the valve body a. In the existing electronic expansion valve, the connection between the small shaft c and the cover d is realized by directly welding the bottom end of the small shaft c to the surface of the cover d. In the above connection process, due to the small width of the bottom of the small shaft, there are difficulties in positioning during welding. [0003] In orde...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21K1/20F25B41/06F25B41/34
CPCY02B30/70
Inventor 李伟李上军
Owner 福鼎市金闽辉机车部件有限公司
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