Patent ID: 8375834

Claim:
A die assembly, comprising: an upper die including a punch and a lower die including a die wherein the upper die mounted on a press ram is connected to the lower die via a die-set guide so as to move backwards and forwards and a stripper plate configured to press a material to be punched against the lower die so as to punch the material through reciprocation of the upper die relative to the lower die, wherein the die assembly comprises a guide rod made up of a lower rod which is fixedly placed on the stripper plate which guides the punch for engagement with the lower die and an upper rod which is placed removably on the stripper plate for engagement with the upper die, and when punching the material for punching, the upper rod is removed from the stripper plate so as to put the upper plate and the stripper plate in a disconnected state, so that the stripper plate is made free to move backwards and forwards relative to the lower die by the lower rod, while when the material for punching is not punched, the upper rod is attached to the stripper plate so as to put the upper die and the stripper plate in a connected state by the upper rod, so that the stripper plate is held on to the upper die.