The composite precision stamping process 'hardware' of precision stamping and electromagnetic forming_

Electromagnetic forming is high-speed forming, and high-speed forming not only expands the aluminum alloy forming range, but also improves its forming performance. The specific method of forming aluminum alloy cover parts by composite precision stamping is: use a set of convex and concave molds to install electromagnetic coils at the sharp corners and difficult-to-form contours of the aluminum alloy cover parts, and form them by electromagnetic methods, and then use a pair of The mold forms the easily-formable part of the cover on the press, and then the preform is deformed at a high speed with an electromagnetic coil to complete the shape. Facts have proved that using this composite precision stamping method can obtain aluminum alloy panels that are difficult to obtain with a single stamping method. New research shows that magnesium alloy is a metal with high specific strength, good rigidity, and strong electromagnetic interface protection performance. Its application prospects in electronics, automobiles and other industries are very promising, and it has a trend to replace traditional iron alloys, aluminum alloys, and plastic materials. . Magnesium alloy parts currently used in automobiles include instrument panels, seat frames, engine covers, etc. Magnesium alloy pipe parts are also widely used in industrial fields such as aircraft, missiles, and spacecraft. However, the close-packed hexagonal lattice structure of magnesium alloy determines that it cannot be stamped and formed at room temperature. Now people have developed a mold that integrates heating and forming to stamp and form magnesium alloy products. The product forming process is as follows: during the descending process of the punch slide, the upper die and the lower die are clamped to heat the material, and then the material is formed in an appropriate motion mode. This method is also suitable for the connection of molded products and the composite precision stamping of various products in a press. Many difficult-to-form materials, such as magnesium alloys, titanium alloys and other products, can be stamped and formed by this method. Because this kind of punching requires the punch slider to have a pause function during the descent process, so as to provide time for heating the material, a new concept of punching machine---CNC crankshaft servo motor punching machine was developed. The punching machine can also be used in punching. The complex precision stamping process including tapping, riveting and other processes is realized in the mold, which effectively expands the range of stamping process and lays a solid foundation for the wide application of magnesium alloys in the plastic processing industry.