A Multi-coil Coupled Modeless Electromagnetic Progressive Forming Method

Abstract

The invention belongs to the field of electromagnetism incremental forming, and discloses a multi-coil coupling non-mold electromagnetism incremental forming device and method. The method comprises the steps that (a) the non-mold electromagnetism incremental forming device is provided, and the device comprises a plurality of form-wound coils and a plurality of upper and lower built-in coils; (b) afinite element model of the non-mold electromagnetism incremental forming device is constructed to simulate an electromagnetism incremental process of to-be-formed board materials, so that simulationparameters of simulated forming parts and simulation parameters of the form-wound coils and built-in coils in the finite element model are acquired; (c) the to-be-formed board materials are placed among the built-in coils, according to the simulation parameters obtained in the step (b), corresponding parameters are set to achieve compression and electromagnetism incremental forming of the to-be-formed board materials, therefore a preforming part is acquired; (d) the form-wound coils at the upper and lower sides are selected from all the form-wound coils, so that the forming coils move along the forming hook face of the preforming part to carry out shaping. By adopting the method, the forming device has light weight, and the acquired part is good in the surface quality and high in formingaccuracy.

Description

technical field [0001] The invention belongs to the field of electromagnetic progressive forming, and more specifically relates to a multi-coil coupled modeless electromagnetic progressive forming method. Background technique [0002] Lightweight is an inevitable trend in the development of contemporary industry. There are generally two ways to achieve lightweight: structural lightweight and material lightweight. Lightweight alloys are typical lightweight materials. At present, aluminum alloys, magnesium alloys, etc. have received a lot of attention. However, due to the poor formability of these light alloys at room temperature, this severely limits the large Scale application. Electromagnetic forming technology provides a new and effective method for the plastic processing problem of such lightweight alloys. Electromagnetic forming is a high-speed forming process. Under the coupling effects of electric field, magnetic field and temperature field, the material is deformed ...

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Problems solved by technology

However, this method requires molds, complex forming devices, high production costs, and long trial period; during the forming process, the sheet material will collide with the surface of the mold, which leads to poor surface quality of the parts and springback; this method can only produce For simple shell parts, such as hemispherical shell parts, this method is powerless for parts with both convex and concave structures or wavy structures on the surface; in addition, this method provides blank-holding force by fastening the plate with screws, The size of the edge force cannot be adjusted flexibly, which affects the forming quality of the part

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