FORMING CONDITION DETERMINATION METHOD AND FORMING CONDITIONDETERMINATION SYSTEM

Intended is to provide a shaping rate deciding method capable of deciding the shaping rate of a pressing apparatus properly and promptly. In the shap ing rate deciding method for deciding the shaping rate of the pressing appar atus, a plate material is provided with a plurality of measurement points, a nd is pressed at a predetermined shaping rate by the pressing apparatus. Nex t, the distorted states (at points Q1 - QN) at the individual measurement po ints thus pressed are plotted in a shaping limit diagram containing a shapin g limit line (FL) of the plate material, thereby to form a distortion distri bution diagram. Of the points (Q1 - QN) plotted in the distortion distributi on diagram, the point the closest to the shaping limit line (FL) is adopted as a specific measurement point. The shaping rate of the pressing apparatus is made lower than the predetermined shaping rate, in case the specific meas urement point is located in an extended region (.epsilon.2 > 0), but is m ade higher than the predetermined rate, in case the specific measurement poi nt is located in a drawn region (.epsilon.2