In order to produce qualified perforated plate parts, the matrix programming method was usually adopted to programming punch holes in the perforated plate, but the shortcoming was found in production that the above-mentioned programming method could not regard the “urgent stop” position as a starting point to punch the rest of the hole. Further, the shortcoming of programming matrix was overcome by progressive programming in line with the relative coordinate system. At the same time, there was also “waste rebound” phenomenon in the trial production. The analysis results show that the reason of “waste rebound” is that the adsorption force between workpiece or scrap and the bottom surface of the punch is larger than the friction force between workpiece or scrap and hole wall of the die. Further, the "waste rebound” phenomenon is solved by decreasing the closed height of the press, which is verified by the production test.
|