A die in which a cutting operation is combined with a noncutting operation is referred to as a combination die. The cutting operations may include blanking, piercing, trimming, and cutoff and are combined with noncutting operations which may include bending, extruding, embossing, and forming.
In a combination die, cutting action is combined with non-cutting actions, i.e. forming. Non-cutting actions may be bending, drawing, extrusion or embossing.
More than one operation is possible in one stroke at a single stage, but the die is more useful for two operations onlyThe die ring is mounted on the die shoe.
The die ring is counter bored at the bottom to allow the flange of a pad to travel up and down. This pad is held flush with the face of die by a spring. The drawing punch of required shape is attached to the die shoe. The blanking punch is placed in the punch holder. The stripper (spring operated) strips the skeleton from the blanking punch. As the workpiece comes in contact with the knock out bar during the return stroke, knock out removes the part attached to the punch. As the part is blanked, the blank holding comes down. Then the drawing punch contacts and forces the blank into the drawing die which is made into the blanking punch.
The die ring is counter bored at the bottom to allow the flange of a pad to travel up and down. This pad is held flush with the face of die by a spring. The drawing punch of required shape is attached to the die shoe. The blanking punch is placed in the punch holder. The stripper (spring operated) strips the skeleton from the blanking punch. As the workpiece comes in contact with the knock out bar during the return stroke, knock out removes the part attached to the punch. As the part is blanked, the blank holding comes down. Then the drawing punch contacts and forces the blank into the drawing die which is made into the blanking punch.
Credit:- www.ques10.com/p/6317/write-about-the-construction-and-working-of-prog-1/
Comments
Post a Comment