| 摘要 |
PROBLEM TO BE SOLVED: To perform fine press forming work by simply evaluating the variation in the properties of a base stock, deterioration with age of a die or the like in a blanking stage. SOLUTION: This die is a die for blanking press of a sheet having a punch and dieing die and, in this die for blanking press of the sheet, a measuring means of working reaction force for measuring the working reaction force in the direction perpendicular to the blanking direction is embedded in the punch and/or the dieing die in the direction perpendicular to the blanking direction. Furthermore, the die has a storing means for recording a reaction force pattern during the blanking press working and a comparing means for comparing it with the standard reaction force pattern which is previously stored. COPYRIGHT: (C)2008,JPO&INPIT
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