An electromagnetic forming device and method for improving the limit and quality of plate turning hole

Abstract

The invention discloses an electromagnetic forming device for improving the panel hole-flanging limit and quality. The electromagnetic forming device for improving the panel hole-flanging limit and quality comprises a male die, a female die matched with the male die, and a blank holder matched with the top end surface of the female die so as to press a panel veneer, wherein a pre-manufactured holeis processed in the panel veneer; an axial tension coil is arranged above the pre-manufactured hole and is arranged in a coil fixing plate; the coil fixing plate is arranged and fixed to the bottom part of the male die; a circular bead is arranged on the bottom part of the male die; a female die sleeve ring is arranged on the periphery of the female die; a blank holder sleeve ring is arranged onthe periphery of the blank holder; grooves are formed in the female die sleeve ring and the blank holder sleeve ring; and radial side pushing coils are arranged in the grooves. The invention providesthe composite die which is capable of greatly prolonging the service lives of the coils and the dies during electromagnetic pulse hole-flanging; and meanwhile, only one tool is required during the whole forming process, and electromagnetic pulse discharge and die reshaping can be carried out synchronously, so that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of sheet material forming, in particular to an electromagnetic forming device and method for improving the limit and quality of sheet material turning holes. Background technique [0002] The traditional hole turning forming method is to punch and turn the hole directly with a steel die. The hole turning process has the following characteristics: (1) The deformation is local and mainly occurs at the bottom of the punch; (2) The deformed area is subjected to tangential tensile stress σ θ and radial tensile stress σ r The combined action of the two results in a deformation in which both the tangential and radial directions are elongated and the thickness is thinned; (3) the deformation of the material in the deformation zone is not uniform, the radial deformation is not obvious, and a large elongation deformation is generated along the tangential direction, and The more it reaches the mouth, the more elongation, mainly...

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Problems solved by technology

However, there is a huge deficiency in this experiment, that is, in order to insulate the coil and discharge safely, the die and blank holder must be made of insulating materials (such as epoxy board) during the forming process, which greatly reduces the life of the mold and coil , cannot be applied industrially

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