A CAD System for Progressive Blanking Dies (1st Report)

The serial studies aim to establish a CAD system which can solve the specifications of the progressive blanking die required to produce a desired product, when the specifications of the product is given as input information. The present paper makes the mathematical model of this designing process clear. The results obtained are summarized as follows. (1) The geometry of the product is first represented by a set of two dimensional patterns, then the required die is designed in such a way as its shape being described by a set of columns which are obtained by sweeping the patterns along the die working direction. (2) In connection with the design parameters along the die operational direction and those on the planes vertical to the direction, the design process is classified separately into two parts. (3) The design parameters on the planes are decided by the three steps; the specifications of the point contour shapes of the tools, the blank layout and the tool layout. They are represented by the set operations of two dimensional patterns, respectively.