The technical requirements of modern automotive stamping parts are developing in the direction of complex structure, increased block size, more components on the relevant side, increased bearing capacity and strict internal stress limit. This requires and promotes the development of special stamping forming techniques such as hydroforming, precision forming, explosive forming, spin forming, dieless forming, laser forming and electromagnetic forming techniques. Limited to this article, here are two techniques for internal pressure forming and electromagnetic forming.
The technical requirements of modern automotive stamping parts are developing in the direction of complex structure, increased block size, more components on the relevant side, increased bearing capacity and strict internal stress limit. This requires and promotes the development of special stamping forming techniques such as hydroforming, precision forming, explosive forming, spin forming, dieless forming, laser forming and electromagnetic forming techniques. Limited to this article, here are two techniques for internal pressure forming and electromagnetic forming.
Hydraulic or injectable elastomer forming technology, the high pressure forming process generally includes:
(1) a process in which an effective medium such as expansion of ice or intrusion of an elastomer causes a very rapid increase in internal pressure;
(2) The formation process of bone hypertension by fluid penalties;
(3) Extreme pressure such as the dynamic process of the explosion. The medium can be an amorphous solid, liquid or gas. In the system, the medium can be arbitrarily changed according to the shape to be processed, and the punch function can be performed, so the medium can be equivalent to a universal mold. Figure 4 is an example of the super-twisting of the sheet material. It can be seen from the figure that the effective medium becomes a punch.
Hydraulic internal high pressure forming technology has several distinct advantages over other press forming technologies:
(1) Large and complex three-dimensional geometric workpieces such as axles, top covers, door frames, etc. can be machined at one time during the forming process;
(2) Because the liquid cools during the forming process, the workpiece is "cold-strengthened" to obtain a higher workpiece strength than the general press working, which allows a thinner plate to be used to make the workpiece lighter;
(3) The outer surface of the workpiece is only in contact with the pressurized liquid, the pressing process is gentle, the forming of the parts is uniform, the symmetrical pressure distribution can be obtained, and the smooth outer surface can be obtained much better;
(4) The cost of dies and tools in full bloom in hydraulic pressure can be reduced by 40%, especially the reduction of the takt time of convex parts processing is short, about 0.1-0.5MIN, which is shorter in the special forming process and can be realized. Mass production.
The electromagnetic forming process using the electromagnetic force generated by the energized coil is another promising new processing method. The process stems from the results of nuclear fission research in the 1960s, but unfortunately has not been paid attention to. Schematic diagram of the electromagnetic forming process when the coil is connected to an alternating current. The magnetic field is established within a few microseconds, so that the metal workpiece, especially the copper-aluminum material with high conductivity, induces a current, which induces a current, and the induced current is subjected to a magnetic field force, so that the tension of the workpiece is matched with the concave mold and rapidly formed. When the coil is in the workpiece, the electromagnetic force will cause the workpiece to be externally formed, which is a widely used process; when the coil plane is placed parallel to the plate, the electromagnetic force will stretch the workpiece.
Electromagnetic forming technology is a non-contact forming process. Its outstanding advantages are rapid processing and high work efficiency, and secondly, it is often used for the connection of metal and non-metal, which can replace bonding or welding. The third is that it does not consume auxiliary materials such as lubrication. Oil, etc., is conducive to environmental protection.
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