Internal high pressure forming displacement-internal pressure loading curve control system

Abstract

The invention discloses an internal high pressure forming displacement-internal pressure loading curve control system. An internal pressure coupling action compensation module is additionally arrangedin the control system, influences brought by internal pressure changes are introduced into multi-axis axial displacement servo closed-loop control, and interference of the internal pressure changes on axial displacement control is compensated; and meanwhile, an oil cylinder displacement coupling action compensation module is additionally arranged, axial displacement changes are introduced into apipe material internal pressure servo closed-loop control link, and interference of pipe end axial feeding on internal pressure control is compensated. As the influences of the internal pressure and displacement coupling action are taken into account, the control system can achieve quick and high-precision loading of an internal pressure and displacement matching curve in internal high pressure forming and is especially suitable for quick and precise control over the displacement-internal pressure loading curve for pipe materials with the large diameter and the high internal pressure.

Description

technical field [0001] The invention relates to the technical field of pipe plastic forming, in particular to an internal high pressure forming displacement-internal pressure loading curve control system. Background technique [0002] Tube high pressure forming technology is an advanced variable-section hollow member manufacturing method, which has been widely used in the production of automotive structural parts, and is also used in the forming of large-diameter closed variable-section tubes in the aerospace industry. The main process is as follows: firstly fill the pipe with liquid, and at the same time seal both ends of the pipe through an axial punch, and then increase the liquid pressure inside the pipe through a supercharger, so that the pipe undergoes plastic deformation under the action of hydraulic pressure and axial force , so as to obtain variable cross-section pipe fittings. [0003] In order to ensure the successful forming of the parts, it is necessary to accu...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a displacement-internal pressure loading curve control system for internal high pressure forming to solve the problem that the existing internal high pressure forming loading system adopts independent internal pressure closed-loop control and pipe end axial feed control, resulting in the inability to realize the loading curve The problem of fast and precise control

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