| 摘要 |
PURPOSE:To prevent a cutting edge from being broken and damaged and to reduce the cost of a maintenance operation in a metal mold which stamps out a tie bar part in a lead frame for a semiconductor IC. CONSTITUTION:Dies 1 as thin sheetlike cutting edges are inserted into gaps formed when two holder blocks 2, 3 which are provided respectively with a plurality of comb-tooth shaped grooves on four sides are combined, and a die unit is constituted. On the other hand, a punch unit is constituted in the same manner. The units are mounted in a position in which the lower mold and the upper mold of a die set are operated on the same track. |
