CN1214974A - Cold-forging forming method for cover of gas generator of car safety air-bag - Google Patents

Abstract

The cold-forge forming process of cover of gas generator for automobile safety gas bag includes the following steps: after lubricating the prepared blank, one-stroke cold-pressing to make the lubricated blank into the form of cup, relieving stress and annealing, then using plate forming method to implement the processes of outwards flanging, flattening and cutting off, and punching hole and die-stamping on the punch machine to obtain finished product forge piece. Said invention provides a new technique for producing "cover" type parts with flanges,and its cost is low and forming accuracy is high.

Description

The cold-forging forming method of a kind of automobile safety air bag gas generator-lid

The present invention relates in the Metal Forming industry, with the cold forging process that (hereinafter to be referred as covering) carries out plastic working to automobile safety air bag gas generator one lid.

Lid is one of vital part of automobile safety air bag gas generator.Accompanying drawing 1 is depicted as the pattern of the part lid on domestic a kind of gas generator of developing.Multiple manufacturing process is arranged, and wherein representational have two kinds: a kind of is forge hot, and its flange position is shaped with the form of overlap.This manufacturing process forging precision is low, and follow-up machining amount is big, and stock utilization is very low; Another kind method is the cold extrusion of multi-pass, and its flange position is to be shaped with the method for pushing.This manufacturing process shaping work step is many, needs bigger cold extrusion press, thereby the production cost height.

The present invention seeks to for the manufacturing process of a kind of stock utilization height, forging precision height, lid that production cost is low is provided.

The forming process of the present invention-lid is:

A. the blank that will prepare is placed in the cold extrusion die after lubricated and once is squeezed into

Cup-shaped components.Except that the flange position, the size that all the other positions all reach the pattern regulation reaches

Required precision;

B. the shaping flange position of turning up reaches the pattern requirement through flattening/side cut, punching.

Key of the present invention is the bottom cold-extrusion shaping with part " lid ", and the flange portion that difficulty is shaped is finished with the sheet material forming method.Two kinds of processes in the plastic forming process are combined dexterously, thereby simplified technical process.Realized the equipment with less tonnage, less operation is finished the shaping task of high accuracy complicated shape forging.Through the lid class element precision height that technological experiment is produced in this way, the stock utilization height, follow-up amount of machining is little, is a kind of desirable forming technology.

The present invention is listed in the table below with the contrast of process aspect economical and technical benefit of producing this forging at present:

As seen from table, the present invention provides the new technology of a kind of small investment, forming accuracy height, low cost of manufacture for the forming technology of " lid ".

Now as follows to the appended description of drawings of this specification:

Fig. 1 is the cold forging drawing of automobile safety air bag gas generator-lid.Fig. 1 (a) is a front view, and Fig. 1 (b) is a vertical view.

Fig. 2 is the forming technology process schematic diagram of " lid ".Fig. 2 (a) is the blank shape figure that gets the raw materials ready, and Fig. 2 (b) is shape figure after the cold extrusion, and Fig. 2 (c) is the shape figure behind the turned welt, and Fig. 2 (d) is the shape figure after flattening, and Fig. 2 (e) is the shape figure after blanking, the punching.

The invention will be further described below in conjunction with drawings and Examples.

Embodiment one: " lid " forming technology following (referring to accompanying drawing 2):

One. get the raw materials ready: will become with machined into shown in Fig. 2 (a) with sawing machine through the circle material of soft annealing

It is lubricated stand-by to carry out squamaization after the shape.

Two. bulk forming: the blank that will prepare is placed in the mould on the cold extrusion press, and is anti-

Be squeezed into cup-shaped shown in Fig. 2 (b).

Three. sheet forming: with the cup-shaped blank of the intermediate shape behind the bulk forming through eliminating stress

After the annealing, turned welt, flattening and moulds such as blanking, punching strike out outside the warp on punch press

Shape is by the finished product forging of " lid " shown in Figure 1.

Claims (2)

1. the cold-forging forming method of automobile safety air bag gas generator-lid, its feature is as follows:

A. the blank once cold extrusion for preparing is pressed into cup-shapedly, except that the flange position, all reaches the pattern chi

Very little and required precision;

B. blank in the middle of cup-shaped is carried out flange and be configured as the finished product forging.

2. the shaping at flange according to claim 1 position is characterized in that: be to use the i.e. work steps shapings such as outer turned welt, flattening and blanking of sheet material forming method.

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