| 摘要 |
The reduced work load for the preparation of the blanking tool for a series of subsequent forming operations is ensured by correcting the blanking tool on the basis of results of subsequent operations. The blank is prepared by electric discharge machining using a wire electrode and the programme for the electric discharge machining is corrected to form the enhanced blank. The machining of the punch, die, stripper and ejector for the blanking tool leaves a 5-10 mm allowance on the profile, while the press tools for drawing, piercing, trimming and flanging are made to final sizes. The sheet blank is electric discharge machined in the NC machine tool using wire tool electrode (2) for simultaneous handling of the packet (3) of 10-30 blanks. The machined blanks are fed to the press tools for final forming of the part, and if surplus or deficiency of metal is noticed, the programme of the NC machine tool is corrected to machine a new packet of blanks. |
