An electromagnetic blank-holding method and device suitable for high-speed forming

Abstract

The invention discloses an electromagnetic blank pressing method and device applicable to high-speed forming. The electromagnetic blank pressing method comprises the steps that (1) in the forming process of a metal plate, an upper blank pressing coil set and a lower blank pressing coil set are arranged on the end surface of an blank pressing part; each blank pressing coil set comprises two different-direction current coils, each blank pressing coil set is embedded in a framework made of high-strength materials, and the frameworks are encapsulated with epoxy resin and then connected into a whole through a high-strength bolt; a lead end of each coil is guided out of the corresponding framework through a copper bar; and (2) in the high-speed forming process, pulse current is led into the blank pressing coil sets, and the two coil sets generate big mutual attraction force; the attraction force is transmitted to the metal plate through the frameworks to carry out blank pressing, or transmitted to a blank holder through the frameworks to carry out blank pressing. By means of the electromagnetic blank pressing method and device applicable to high-speed forming, the problems that a traditional electromagnetic forming process needs a press or a mechanical tool, and existing workpiece forming is limited by the size of a table surface of press equipment are solved, and the electromagnetic blank pressing method and device applicable to high-speed forming particularly meet the needs of large tonnage and a large table surface in a large-workpiece forming process.

Description

technical field [0001] The invention belongs to the technical field of forming, and more specifically relates to an electromagnetic edge-holding method and device suitable for high-speed forming. Background technique [0002] In sheet metal stamping, in order to prevent wrinkling on the periphery of the sheet during stretching, it is necessary to apply a certain blank holder force, and the generation and control of this force is very critical. On the one hand, if the blank holder force is too large, although the metal sheet is not easy to wrinkle, it will cause a problem that the friction resistance is large and is not conducive to the plastic flow of the metal sheet, which is very unfavorable for deep drawing. On the other hand, if the blank holder is too small, wrinkling of the sheet cannot be effectively suppressed. The ideal blank-holding method for forming that requires plastic flow is one that can suppress wrinkling and minimize the frictional resistance caused by bla...

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides an electromagnetic blank-holding method suitable for high-speed forming, which uses the electromagnetic attraction force of two coils to replace the hydraulic pressure of the traditional press, so that the pressure and action time are flexible Controllable; solves the problem that the size of the existing formable workpiece is limited by the size of the pressure equipment table

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