Method of plastic forming

Details Method of plastic forming Method of plastic forming

B - Operations, Transporting

21

J

B21J 5/06 (2006.01) B21J 9/12 (2006.01) B21J 9/20 (2006.01) B30B 1/32 (2006.01) B30B 15/18 (2006.01) B30B 15/20 (2006.01)

Patent

CA 2091898

ABSTRACT OF THE DISCLOSURE A method of plastic forming in which a blank in the die undergoes plastic deformation with the advance of a punch whose moving speed is controllable. Deformation of the die incurred by an impact caused when the punch strikes the die is prevented by slow advance of the punch until the die touches the blank. When the punch comes into contact with the die, the pressure to move the punch forward, while interfering with the advance of the punch, is raised to a limit at which plastic deformation occurs. The advance speed of the punch is controlled so that, with release of the pressure having interrupted the advance of the punch, distortion speed of the blank may be made substantially uniform almost throughout the area subjected to plastic forming. Uniform stress acting on the die as a result of uniformized distortion speed of the blank leads to a uniform amount of deformation of the die almost throughout area subjected to plastic forming, whereby lowering of precision in forming caused by fluctuations in the deformation amount of the die is prevented. With the pressure of ejecting means made relatively higher than that of the punch at the time of ejection, spring-back of the die is prevented by ejection of the blank under pressure.

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