Composite multi-step local plastic electromagnetic forming method for sheet workpiece

Abstract

The invention belongs to the technical field of workpiece forming and manufacturing, and discloses a composite multi-step local plastic electromagnetic forming method for a sheet workpiece. The composite multi-step local plastic electromagnetic forming method comprises the steps that (1) the to-be-formed workpiece is fabricated and positioned by utilizing a concave mold and a blank pressing block, meanwhile, a forming coil and the workpiece are positioned and fastened, and an electromagnetic forming machine is connected with the forming coil; (2) the electromagnetic forming machine is discharged, and the workpiece is driven by an electromagnetic force deviating from the forming coil, so that partial material is deformed towards a mold cavity of the concave mold; (3) the forming coil is replaced by a forming coil suitable for the shape of the workpiece after deforming, and the discharge energy of the electromagnetic forming machine is reset for forming the workpiece again; and (4) step (3) is repeated until the workpiece attaches the concave mold. According to the composite multi-step local plastic electromagnetic forming method for the sheet workpiece, nonuniform deformation of the partial material in a deformation area of the workpiece is controlled, and requirements of tooling and fabricating precision are reduced.

Description

technical field [0001] The invention belongs to the technical field related to part forming and manufacturing, and more specifically relates to a composite multi-step local plastic electromagnetic forming method suitable for plate workpieces. Background technique [0002] Due to the advantages of low density and high specific strength, aluminum alloys are widely used in aerospace, automotive and other fields. However, the formability of aluminum alloy materials at room temperature is significantly lower than that of steel, which seriously restricts the processing and application of aluminum alloy parts. Electromagnetic forming is a high-speed forming method that uses magnetic field force to plastically deform metal blanks, which can significantly improve the forming properties of materials, and has increasingly broad application prospects in forming aluminum alloys and other materials. In addition, electromagnetic forming only requires a single-sided mold, which can simplify...

AI Technical Summary

Problems solved by technology

The above scheme is relatively complicated, the forming efficiency is low, and the qualified rate of the workpiece is low; due to the large springback, the forming shape accuracy is low, and the surface quality is difficult to control; for large plate workpieces (size greater than or equal to 2 meters), a larger Tabletop press equipment; in addition, higher requirements for molds, tooling and equipment assembly

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