Electroplastic incremental forming device and method for plates

Abstract

The invention relates to an electroplastic incremental forming device and an electroplastic incremental forming method for plates. The device comprises a five-axis numerical control forming machine tool, a six-axis parallel robot machining system, a plate forming clamp, a high energy pulse power supply, an infrared thermometer, and a compressed air cooling system embedded in the machine tool, wherein an upper forming pressing head is arranged at the tail end of a spindle of the five-axis numerical control forming machine tool; the six-axis parallel robot machining system is arranged on a working table of the machine tool; the top of the six-axis parallel robot machining system is provided with a lower forming pressing head; the plate forming clamp is fixed on the working table of the machine tool; positive and negative poles of the high energy pulse power supply are connected with the upper forming pressing head and the lower forming pressing head through high current-carrying conductors respectively so as to form a current loop among the high energy pulse power supply, the upper forming pressing head, the lower forming pressing head and the plates; a camera of the infrared thermometer is aligned with a central area of each plate; and the compressed air cooling system is aligned with a forming area of each plate. Compared with the prior art, the invention has the advantages of high efficiency, energy conservation, high machining precision, high surface quality and the like.

Description

technical field [0001] The invention belongs to the technical field of sheet material progressive forming processing, and in particular relates to a sheet material electroplastic progressive forming device and a forming method thereof. Background technique [0002] Electroplastic effect (electroplastic effect) refers to the material (including various metal materials, ceramic materials, superconducting materials, powder metallurgy products, etc.) under the action of moving electrons (current or electric field), the deformation resistance drops sharply and the plasticity improves significantly. The phenomenon is a result of the joint action of various physical effects including Joule heating effect, magnetic compression effect and pure electroplastic effect. The electroplastic effect was first discovered in 1963 by the former Soviet scholar Troitskii when he was doing research on surfactants, and then the former Soviet Union and American scholars conducted a lot of research. ...

AI Technical Summary

Problems solved by technology

[0004] A search of existing incremental forming technologies and devices found that: H.Meier of Ruhr-University of Bochum, Germany, etc. formed a double-press sheet progressive forming device by setting two 6-axis serial robots on both sides of the sheet , workpieces with convex and concave features can be processed at the same time, but the deformation resistance of the sheet is not considered, the required forming load is large, and the forming geometric accuracy is poor

J.R.Duflou of Katholieke Universiteit Leuven in Belgium proposed a device that uses laser-assisted heating for progressive forming. A 6-axis robot clamping head movement is set on one side of the sheet, and a 3-axis robot is set on the other side. The advanced synchronous laser heating device dynamically heats the contact area between the indenter and the sheet, which reduces the forming force and improves the spatial processing accuracy, but this device uses two sets of motion mechanisms, the control is complicated, and the sheet has a reflection effect on the laser , the heating efficiency is low, and the laser is expensive

Gao Lin of Nanjing University of Aeronautics and Astronautics proposed a sheet metal electric heating numerical control progressive forming device, which can significantly reduce the processing force and reduce the springback of the sheet metal, but because of the single pressure head forming, the forming dimensional accuracy is not high, The magnitude of the current flowing through the sheet metal forming area is the same as that of other areas, the material yield stress and hardening index in the forming area are not much lower than those in the adjacent area, the localization effect of progressive forming is not significant, and the thermal effect of the current is mainly used, The forming temperature of the workpiece is high, the material is easy to be excessively softened, which is not conducive to forming, and the surface is seriously oxidized, which affects the surface quality of the formed part

The above-mentioned devices have not considered the introduction of the electroplastic effect of the material into the progressive forming, and it is difficult to process products with high precision and high surface quality at low cost and high efficiency.

Images