A forward drawing-backward bulging composite superplastic forming device and method thereof under the action of sheet material inflated back pressure

Abstract

The invention provides a forward deep drawing-reverse bulging composite superplastic forming device and method for boards under an inflated backpressure effect, relates to a superplastic forming device and method and aims at solving the problem that part walls are constantly thinned and accordingly break by adopting a traditional superplastic forming technology in the forming process of parts higher in height-diameter ratio and accordingly the parts higher in height-diameter ratio cannot be formed. The device comprises a convex die, a pressure ring, a concave die and an inflation hole. The method comprises the steps that 1, die assembly is performed; 2, the temperature rises; 3, the down going speed of the convex die and the pressure exerted to a board to be formed are set, and the pressure ring is arranged to exert the pressure to the board to be formed; 4, the convex die and the pressure ring are started, gas is introduced to a concave die cavity to obtain a formed part. The forwarddeep drawing-reverse bulging composite superplastic forming method for boards under the inflated backpressure effect can be achieved by adopting the device.

Description

technical field [0001] The invention relates to a superplastic forming device and a method thereof. Background technique [0002] Traditional sheet metal superplastic forming mainly obtains shape through air bulging at high temperature and low strain rate. Since the stress state is mainly bidirectional tensile stress, there must be a thinning phenomenon during the forming process. For parts with relatively small height and diameter, it can be achieved. A complex shape can be formed at one time, and its thickness distribution can also be controlled by the order of thinning, such as forward and reverse inflation forming, sheet metal pre-thinning and other methods. However, for parts with a relatively large height and diameter, the deformation zone of the plate will be cracked due to continuous thinning during the deformation process, and the simple superplastic inflation forming cannot meet the forming requirements at all, as shown in the attached drawing of the manual figure...

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Problems solved by technology

[0003] The purpose of this invention is to solve the problem that the traditional superplastic forming technology will break due to the continuous thinning of the part wall in the process of forming parts with relatively large height and diameter, and the problem that parts with relatively large height and diameter cannot be formed, and provide a plate Forward drawing-backward bulging composite superplastic forming device and method thereof under the action of inflated back pressure

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