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Forming method of thin-wall nut

A thin-wall, nut technology, applied in nuts, threaded fasteners, connecting components, etc., can solve the problems of affecting product quality, low production efficiency, long manufacturing cycle, etc. Lubricity effect

Active Publication Date: 2014-04-02
AVIC STANDARD PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the processing method of disc thin-walled nuts is the sheet metal deep drawing process, that is: blanking - blanking - deep drawing - secondary deep drawing - multiple deep drawing - punching - flanging - trimming - Tapping and deep drawing processes use deep drawing dies. The die structure is more complex, there are many processes, and the manufacturing cycle is long.
The deep drawing process of sheet metal is an area forming method. The problems that often occur in production are wrinkling and cracking during deep drawing, and cracks during flanging, which affect product quality and low production efficiency, which hinders mass production of such products.

Method used

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  • Forming method of thin-wall nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 1 , a thin-walled nut forming method, comprising the steps of:

[0020] (1) Raw material: The raw material is the annealed round steel wire with phosphating and saponification on the surface. The steel wire is straightened by the cold heading machine. The straightened steel wire is sent to the cutting mechanism and cut into small pieces of blanks. The length is determined by the process volume of the part;

[0021] (2) Initial upsetting: Put the blank cut into small pieces into the female mold for end face shaping, which can avoid burrs and facilitate further deformation of the blank. Under the action of the shaping punch and the female mold, the blank is shaped into a cylinder and The combination of cone and frustum, the size of the cone angle is 90°, and the diameter of the small end of the cone is 0.5 times the diameter of the cylinder. At this time, the diameter of the cylinder is the minimum value of the diameter of this part of the part minus 0.4mm;

...

Embodiment 2

[0029] see figure 1 , a thin-walled nut forming method, comprising the steps of:

[0030] (1) Raw material: The raw material is the annealed round steel wire whose surface has been phosphated and saponified. The steel wire is straightened by an automatic cold heading machine. The straightened steel wire is sent to the cutting mechanism and cut into small pieces of blanks. The length of is determined by the process volume of the part;

[0031] (2) Initial upsetting: Put the blank cut into small pieces into the female mold for end face shaping, which can avoid burrs and facilitate further deformation of the blank. Under the action of the shaping punch and the female mold, the blank is shaped into a cylinder and The combination of cone and frustum, the size of the cone angle is 102°, and the diameter of the small end of the cone is 0.6 times the diameter of the cylinder. At this time, the diameter of the cylinder is the minimum value of the diameter of this part of the part minu...

Embodiment 3

[0039] see figure 1 , a thin-walled nut forming method, comprising the steps of:

[0040] (1) Raw material: The raw material is the annealed round steel wire whose surface has been phosphated and saponified. The steel wire is straightened by an automatic cold heading machine. The straightened steel wire is sent to the cutting mechanism and cut into small pieces of blanks. The length of is determined by the process volume of the part;

[0041] (2) Initial upsetting: Put the blank cut into small pieces into the female mold for end face shaping, which can avoid burrs and facilitate further deformation of the blank. Under the action of the shaping punch and the female mold, the blank is shaped into a cylinder and The combination of cone and frustum, the size of the cone angle is 110°, and the diameter of the small end of the cone is 0.7 times the diameter of the cylinder. At this time, the diameter of the cylinder is the minimum value of the diameter of this part of the part minu...

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Abstract

The invention discloses a forming method of a thin-wall nut. The forming method comprises the following steps: (1) treatment of raw materials, namely aligning wires used as the raw materials by virtue of a cold upsetting machine, conveying the aligned wires to a material cutting mechanism and cutting the wires into small sections of wire blanks; (2) primary upsettig, namely putting the small sections of wire blanks into a female die, performing end surface reshaping on the wire blanks by virtue of a reshaping punch and the female die, so as to obtain a cylinder and frustum combination body; (3) pre-upsetting, namely overturning the blank subjected to primary upsetting so as to enter into a cavity of the female die, and reshaping the blank as a mushroom shape; (3) semi fine supsetting, namely forming a tray part by use of a semi fine upsetting die and forming pre-upset holes; (5) fine upsetting, namely deepening the hole by virtue of a fine upsetting die; (6) punching; (7) threading. According to the forming method disclosed by the invention, a wire upsetting process is used for replacing a sheet material deep-drawing process, area deformation is replaced by volume deformation, and various problems such as drawing breakage and wrinkling caused by area formation in the deep-drawing process can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of nut manufacture, and in particular relates to a thin-walled nut forming method. Background technique [0002] Thin-walled nuts are commonly used in automobiles, motorcycles, bicycles, etc., and are mainly welded on thin plates to enhance the link strength between thin plates and other components. With the increase in the number of cars, the annual market demand for this nut is no less than 1 billion pieces. In the prior art, the processing method of disc thin-walled nuts is the sheet metal deep drawing process, that is: blanking - blanking - deep drawing - secondary deep drawing - multiple deep drawing - punching - flanging - trimming - Tapping and deep drawing processes use deep drawing dies, which have complex structures, many processes, and long manufacturing cycles. The deep drawing process of sheet metal is an area forming method. The problems that often occur in production are wrinkling and crackin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/64
Inventor 王恩洪肖文英赵富俊
Owner AVIC STANDARD PARTS MFG
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