Question

State “Plane washer” making process with use of combination die.

Answer 1

(Note: The plain washers can be produced by using Compound die or Progressive die. It is not possible to use combination die for making plain washers, so consider compound die or progressive die for answer. However credit should be given to any other suitable answer using combination die.)

Compound Die: Figure shows a simple compound die in which a washer is made by one stroke of the press. The washer is produced by blanking and piercing operations. Simultaneous blanking and piercing is achieved by providing blanking and piercing element in both the member of die, i.e. the upper and the lower member of the die. These elements are set exactly opposite to each other so that piercing punch acts in the opposite direction with respect to the blanking punch. In this way blanking and piercing Operations are performed simultaneously. The flatness of the blank is achieved during cutting operation by knock out plate.

OR

Progressive die for making plain washer

In a progressive die two or more operations are performed simultaneously at two or more stations with each press stroke by mounting separate sets of dies and punch. The metal is progressed from one station to other. Figure shows progressive punching and blanking die .The sheet metal is fed into the first die where a hole is pierced by piercing die set in first cutting stroke of ram. The plate is then advanced in next station. In the second stroke of ram the pilot enters into the pierced hole and correctly locate it while the blanking punch descend and shear the plate to form a washer.

1. Stop 2.sheet metal 3.pilot 4.blanking punch 5.ram 6.piercing punch 7.stripper 8.die