| 摘要 |
PURPOSE:To perform cut-off shaping with high accuracy by providing a punch and a die which comprise the parts for fixing the roots of leads, the parts for cutting off the corners of tie bars, the parts for shaping the lead frame which still having the tie bars and the means for cutting off the tie bars after shaping. CONSTITUTION:The roots projecting sideway from the main body of a package 2 of a lead frame 1 before cut-off shaping is held and fixed by a bottom shaping part 4 of a die and a top lead stopper 7 of a punch. Next, a corner 11 of tie bar of the lead frame 1 cut off by a lowering operation of a top tie bar cut-off part 9. After that, the lead frame 1 still having a tie bar 12 is formed into the predetermined bent shape by the bottom shaping part 4 of the die and a top shaping part 8 of the punch. In this case, the top shaping part 8 of the punch lowers in a direction of the die to perform shaping. Next, the top tie bar cut-off part 9 of the punch lowers in a direction of a bottom tie bar cut-off part 5 of the die thereby cutting off the tie bar 12 of the lead frame 1 after shaping and separating it from the lead frame 1. |
