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Electromagnetic blank holder method suitable for high-speed forming

A technology of edge blanking and high speed, which is applied in the field of electromagnetic blanking of high-speed forming, can solve the problems of large frictional resistance and unfavorable plastic flow of metal sheets, unfavorable deep drawing, and inability to effectively suppress wrinkling of sheets, etc., and is conducive to plastic flow. , the effect of reducing plastic flow resistance and contact pressure

Inactive Publication Date: 2014-02-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Electromagnetic blank holder method suitable for high-speed forming
  • Electromagnetic blank holder method suitable for high-speed forming
  • Electromagnetic blank holder method suitable for high-speed forming

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Embodiment approach

[0021] like figure 1 As shown, according to the first embodiment of the present invention, the electromagnetic blank-holding method suitable for high-speed forming of the present invention is applied in an electromagnetic forming system, which includes a base 1, a die 2, an electromagnetic forming coil 6, As well as the press motion platform 7, the method includes the following steps:

[0022] (1) Fixing the first crimping coil 11 and the second crimping coil 12 on the press motion platform 7 through the first tooling 21 and the second tooling 22 respectively;

[0023] (2) Control the motion platform 7 of the press so that the first crimping coil 11 and the second crimping coil 12 are in contact with the upper end surface of the metal plate 3, but no mechanical pressure is applied;

[0024] (3) During the electromagnetic forming process of the sheet metal part 3, the first blanking coil 11 and the second blanking coil 12 are supplied with pulse currents, which induce eddy cur...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D24/04B21D24/10
Inventor 李亮周中玉韩小涛
Owner HUAZHONG UNIV OF SCI & TECH
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