Experimental study of lancing parameters on stacking strength for laminated sheet

The purpose of this work is to study the effect of lancing parameters on increasing stacking strength in the progressive stamping process for laminated sheet producing motor core parts. Sheet material is silicon steel JIS C2552 with 0.5 mm thickness. Investigating parameters include clearance of cutting and geometry on the lancing punch; straight length of punch bottom and punch angle. It can be concluded that tool with small clearance introduce high burnish zone on the cutting edge thus higher contact area increasing stacking strength. However, tool with large clearance introduce larger size of the blank than its hole thus also increasing stacking strength. The maximum stacking strength obtained from lanced sheet with straight length on the bottom part of 1.5 mm due to proper matching with the size of piercing hole. Small straight length of punch bottom introduced large space to the pierced hole of bottom sheet thus bending of the sheet occurred reducing the joining strength. Excessive straight length of pun