Electronic expansion valve small shaft and cover plate and forming method

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...

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 to ensure the perpendicularity between the two, the present invention provides a small shaft, cover plate and forming method of the electronic expansion valve

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