Electromagnetic blank holder method suitable for high-speed forming

Abstract

The invention discloses an electromagnetic blank holder method suitable for high-speed forming. The method includes the steps that (1) blank holder coil assemblies are placed on end faces of a blank holder portion of a metal sheet part, can be only placed on the upper end face or the lower end face of the blank holder portion of the metal sheet part and can also be placed on the upper end face and the lower end face of the blank holder portion of the metal sheet part at the same time, the blank holder coil assembly placed on the lower end face of the blank holder portion of the metal sheet part is supported by means of a female die, the blank holder coil assembly placed on the upper end face of the blank holder part of the metal sheet part restrains blank holder coils to move through a pressing machine or a bolt fastening structure, and pressure can be applied to the blank holder coil assemblies when moving of the blank coils is restrained; (2) in the high-speed forming process, pulse currents are fed into the blank holder coil assemblies, vortexes are sensed on the blank holder portion of the metal sheet part, and therefore electromagnetic pressure is generated on the blank holder portion of the metal sheet part. The method eliminates the contradiction that in a traditional forming process, blank holder force cannot prevent the metal sheet part from wrinkling, is high and causes high frictional resistance to block shaping flowing of the metal sheet part.

Description

technical field [0001] The invention belongs to the field of forming, and more specifically relates to an electromagnetic edge-holding method suitable for high-speed forming. Background technique [0002] In sheet metal stamping, especially in deep drawing, the control of blank holder force is very critical. 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. If the blank holder is too small, it cannot effectively suppress the wrinkling of the sheet. The ideal blank-holding method for forming that requires plastic flow is one that can suppress wrinkling and minimize the frictional resistance caused by blank-holding. Therefore, it can not only suppress wrinkling, but also reduce frictional resistance, which is of great significance for improving the forming ability. Conte...

AI Technical Summary

Problems solved by technology

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

If the blank holder is too small, it cannot effectively suppress the wrinkling of the sheet

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