Integrated forming method for storage tank base

Abstract

The invention provides an integrated forming method for a storage tank base. The integrated forming method comprises the following steps that S1, pre-pressing forming is conducted, specifically, a blank holder is controlled to move towards the direction of a female die, when a plate blank makes contact with the surface of the female die, the blank holder stops moving, and a shallow barrel is formed; S2, reverse drawing deep forming is conducted, specifically, a punch is controlled to move towards the direction of the female die and stop moving until the plate blank makes contact with the surface of the female die, and a shallow conical barrel is formed; S3, bulging forming is conducted, specifically, a high-pressure fluid medium being injected through a fluid channel acts on the bottom andthe side wall of the shallow conical barrel, so that the shallow conical barrel is deformed; and S4, demoulding and workpiece taking are conducted, specifically, after forming is finished, the punchmoves upwards, then the blank holder moves upwards, a pressure medium is injected through an exhaust hole, and demoulding and workpiece taking are conducted under the buoyancy action of the pressure medium. According to the integrated forming method for the storage tank base, one-time forming with a set of tools and under a same work station is achieved, the manufacturing period of the tank base is greatly shortened, the forming quality is improved, and digital control and mass production quality control are easily achieved.

Description

technical field [0001] The invention relates to the field of integral forming of large complex curved deep cavity components, in particular to a method for integral forming of the bottom of a storage tank. Background technique [0002] The bottom of the space launch vehicle propellant storage tank is a space ellipsoidal shell, which belongs to a large complex curved surface deep cavity thin-walled component. The bottom of my country's active launch vehicle tanks is made of aluminum alloy plates that can be strengthened by heat treatment, and the wall thickness of the plates is greater than 4mm. Taking the bottom of a storage tank with a diameter of 3350mm as an example, the forming method of "block forming + assembly welding" is usually adopted. The structure of the bottom of the tank formed by tailor welding is as follows: figure 1 shown. [0003] The main problems of tailor welding forming method are: low shape and dimension accuracy, poor reliability; low forming effici...

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Problems solved by technology

[0006] The object of the present invention is to provide a method for integrally forming the bottom of a storage tank to solve the problem of low shape and dimension accuracy and poor reliability of the existing tailor welding forming method; low forming efficiency and heavy workload; low structural rigidity and poor weight reduction ability; The problem of serious waste and high production cost

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