A progressive or follow on die has a series of operations. At each station, an operation is performed on a work piece during a stroke of the press.
Between strokes the piece in the metal strip is transferred to the next station.
A finished work piece is made at each stroke of the press.
While the piercing punch cuts a hole in the stroke, the blanking punch blanks out a portion of the metal in which a hole had been pierced at a previous station.
Thus after the first stroke, when only a hole will be punched, each stroke of the press produces a finished washer.
The die block is made up of four pieces and fastened to the die shoe.
This permits easy replacement of broken or worn die blocks. The stock is fed from the right and registers against a finger stop (not shown). The first stroke of the press produces a square hole and two notches. These notches form the left end of the first piece. During the upstroke of ram, the stock is moved to the next station against a finger stop (not shown). The stock is positioned for the second stroke. The second station is an idler.
The right end of the first piece, the left end of the second piece, and a second square hole are pierced. The ram retracts and the scrap strip is moved to the third station against an automatic stop.
This stop picks up the notched V and positions the scrap strip. The fourth stroke, cuts off and forms the radii at the ends of the finished piece. Thereafter every stroke produces a finished part.
Credit:- www.ques10.com/p/6317/write-about-the-construction-and-working-of-prog-1/
Between strokes the piece in the metal strip is transferred to the next station.
A finished work piece is made at each stroke of the press.
While the piercing punch cuts a hole in the stroke, the blanking punch blanks out a portion of the metal in which a hole had been pierced at a previous station.
Thus after the first stroke, when only a hole will be punched, each stroke of the press produces a finished washer.
The die block is made up of four pieces and fastened to the die shoe.
This permits easy replacement of broken or worn die blocks. The stock is fed from the right and registers against a finger stop (not shown). The first stroke of the press produces a square hole and two notches. These notches form the left end of the first piece. During the upstroke of ram, the stock is moved to the next station against a finger stop (not shown). The stock is positioned for the second stroke. The second station is an idler.
The right end of the first piece, the left end of the second piece, and a second square hole are pierced. The ram retracts and the scrap strip is moved to the third station against an automatic stop.
This stop picks up the notched V and positions the scrap strip. The fourth stroke, cuts off and forms the radii at the ends of the finished piece. Thereafter every stroke produces a finished part.
Credit:- www.ques10.com/p/6317/write-about-the-construction-and-working-of-prog-1/
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