A workpiece electromagnetic progressive forming device and method provided with coils arranged along the shape

Abstract

The invention discloses a workpiece electromagnetic incremental forming device provided with profile-followed arrangement coils, and further discloses a workpiece electromagnetic incremental forming method. The workpiece electromagnetic incremental forming device comprises a supporting frame, a mould, a plate, plate clamping assemblies for fixedly clamping the plate, and a driving piece for driving the mould to move so as to conduct stretch forming on the plate, and further comprises the multiple profile-followed arrangement coils. The plate clamping assemblies are arranged on the supporting frame; the plate is fixedly clamped between the plate clamping assemblies; the driving piece is connected with the mould; the profile-followed arrangement coils are arranged on the periphery of the surface of the plate subjected to stretch forming by the mould in a surrounding mode; and all the profile-followed arrangement coils are arranged on layers of different heights above the plate correspondingly. The workpiece electromagnetic incremental forming method comprises the steps of plate fixing, stretch forming of the plate, electromagnetic forming through the profile-followed arrangement coils and the like, and the plate and the mould are attached by repeatedly executing plate stretch forming and electromagnetic forming. The workpiece electromagnetic incremental forming device and methodhave the advantages of being high in forming precision, good in forming quality, high in efficiency, high in utilization rate of discharge energy, low in equipment energy demand and the like.

Description

technical field [0001] The invention belongs to the technical field of sheet metal forming, and in particular relates to an electromagnetic progressive forming device and method for workpieces provided with coils arranged along the shape. Background technique [0002] With the rapid development of high-tech industries such as aerospace, there is an urgent need to adopt large-scale integral thin-walled shells with very significant structural benefits in advanced aircraft, spacecraft, rockets, and missiles to reduce weight, increase the load-carrying capacity limit and range of the carrier, etc. overall performance. Large-scale, thin-walled, light-weight, high-precision, high-strength, and good fatigue-resistant parts are typical representatives, such as large tank heads of spacecraft, cruise missile cabin sections, aircraft and spacecraft hoods , sub-tank and engine housing, etc. [0003] The plastic forming methods of large shell components mainly include: (1) spinning for...

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Problems solved by technology

However, there are three problems in the forming methods of the above two kinds of workpieces: (1) The small coil needs to be rotated on one layer, and the local small area is discharged multiple times, which leads to the deformation of the coil facing the sheet area and the two adjacent coils The deformation of the sheet metal in the overlapping area of ​​the discharge position is often inconsistent, resulting in poor deformation uniformity of the same layer of sheet material; (2) The whole process uses small coils of the same size, but each level of high-rise sheet material is drawn The final radii are not consistent, which leads to the use of coils with the same radian and cannot guarantee the forming accuracy of each layer of the sheet; (3) In order to ensure that the coil rotates once, the four oil cylinders descend to pull the supporting plate and the pressure plate, and drive the sheet metal Plastic deformation occurs

However, in the course of the experiment, even if the four oil cylinders use synchronous motors, it is difficult to ensure that each drop of the oil cylinders has the same displacement. Horizontal plane, it is necessary to artificially add pads and other methods to adjust the level of the pressure plate and the supporting plate, the forming process is complicated and time-consuming

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