A low-pressure thermoforming device and method for hollow components made of high-strength or low-plastic materials

Abstract

The invention relates to a high strength or low-plasticity material hollow member low pressure thermoforming apparatus and a method thereof. The method comprises the following steps: preparing a mold, preparing an initial pipe blank, selecting the initial pipe blank with appropriate size, sealing the end part of the pipe blank by a left seal punch and a right seal punch, then moving to an assigned position together; moving a left electrode and a right electrode to the initial pipe blank for contacting, adjusting a pressure-reducing valve, closing a power switch, descending an upper mold to urge the formation of the pipe blank, controlling the internal air pressure until the mold is closed; continuously maintaining pressure to molding the pipe blank, breaking the power switch, turning on a cooling medium switch, introducing a cooling medium into the pipe blank, backing without influence of removal of a forming part, opening the mold, and removing the forming part. The apparatus and the method have the beneficial effects that when the high strength or low ductility hollow member are formed by current apparatus and technology, problems of large deformation resistance, poor uniformity of wall thickness of the forming part and low dimension precision, easy rupture generation, low efficiency and difficult heat treatment synchronization can be solved.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a low-pressure thermoforming device and method for hollow components made of high-strength or low-plasticity materials. Background technique [0002] Due to the high flexural modulus and shear modulus of hollow section members, it is considered to be the best structural form to achieve lightweight structures. Widely used in aviation, aerospace, automobile and bicycle industries. Fluid internal pressure forming is an advanced forming technology for processing such components. The technical principle of fluid internal pressure forming is to apply high medium pressure to the interior of the initial blank to increase the perimeter of the blank section to form hollow members with different cross-sectional forms. The essence of its deformation is the billet expansion deformation. However, this deformation mode has limitations and cannot be used for forming materials with high...

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Problems solved by technology

[0009] The purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, and to provide a high-strength or low-plastic material hollow member low-pressure thermoforming device and method, which mainly solves the problem of forming high-strength or low-plastic hollow members with existing devices and processes. Large deformation resistance, poor wall thickness uniformity and low dimension accuracy of formed parts, easy to crack, low efficiency and inability to perform heat treatment simultaneously

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