Research on point-pressing based double-sided CNC incremental forming

Abstract

For the problem of the sheet distortion caused by the force of the two extrusion forming tools on the sheet in the double-sided CNC incremental forming, a point-pressing based double-sided CNC incremental forming was proposed in which the consecutive-extrusion of the extrusion forming tool on the sheet was replaced by the point-pressing. A point-pressing based double-sided CNC incremental forming toolpath generation algorithm based on the consecutive-extrusion based double-sided CNC incremental forming toolpath was presented. The double-sided CNC incremental forming processes based on the point-pressing and consecutive-extrusion was simulated by using the ANSYS/LS-DYNA software and the actual forming experiment. The numerical simulation results show that the double-sided CNC incremental forming based on the point-pressing compared with the process based on the consecutive-extrusion can acquire less circumferential displacement, less distortion, more evenly distributed average equivalent strain and less mutagenicity. It can be seen from the actual forming experiment that the sheet metal part formed by the point-pressing method has better geometric anastomosis with the design model than that formed by the consecutive-extrusion method.