METHOD OF MAKING PUNCHING DIES

摘要

A method of fabricating punching dies consists in first making a pack of parts of a desired profile to be used as positive electrodes-instruments. The working parts of the punching die are preliminarily subjected to mechanical processing. The positive electrodes-instruments are provided with technological openings, then one of the positive electrodes-instruments is used for marking the working parts of the die after which the dimensions of the working profile of that electrode-instrument are diminished mechanically or chemically and the latter is used for rough electro-erosion machining of the matrix and the lifter. The second positive electrode-instrument is used for finish electro-erosion machining of the matrix and the lifter. The third positive electrode-instrument is used for burning-through a pack of negative electrodes-instruments in which technological openings are made. The negative electrodes-instruments are used for rough and finish machining of the punch and the pusher.