Punches and dies : layout, construction and use by Stanley Frank Arthur 1874-

Author:Stanley, Frank Arthur, 1874-
Language: eng
Format: epub
Tags: Punching machinery, Dies (Metal-working)
Publisher: New York : McGraw-Hill
Published: 1919-03-25T05:00:00+00:00

DRAWING DIES AND THEIR ACTION UPON MATERIALS 197

regulation of pressure on the plate J is obtained in the usual way by the stud L and the nut N. The blanking die F is held by screws G. The cup is, carried up into the cavity in the punch C and as this die is used on an inclined press, the cups roll out of the opening at the back and into a recep-taclc; being forced out by the succeeding cups as they are formed. At no time are there more than two cups in the cavity.

The lower punch is vented at 0 so that the cups will strip readily. The production on this operation is 3000 pieces per hour.

Following Operations

The second, third, fourth, and fifth operations are now put through the die shown in Fig. 265, whereby the operator transfers the operations in proper rotation from one die to another, keeping all dies suppUed. Th3 capacity of this die is 1000 pieces per hour.

In Fig. 265 is shown the front view of the gang dies for the four final operations. The punch holder A and the die holder B are kept in proper alinement with each other by guide pins.

The shell B (Fig. 263) is drawn in the second operation die F by the punch G, This punch has an air hole to allow easy stripping. The shell C (Fig. 263) is drawn in the third operation die H by the punch /. This punch has an air hole at 0. The shell D is drawn in the fourth operation die J by the punch Ky a 45-degree angle fiange being bulged in the bottom and a ^ in. hole punched. The shell E is trimmed on the fiange in the fifth operation die L by the punch M,

The stripper N is held in place by the screws SS, which are long enough to gi^e the stripper the proper movement to release the shells from the punches with the aid of the lower knockout plate T. This stripper is fitted with carbon steel bushings screwed into place. The knock out plate T also releases any shells from the dies by giving the knock out pins Y and Z the proper movement. The stripper bolts U are adjusted in relation to the stroke of the press.

The punches G, /, K, and M are held in position by tapered pins 7. The punch K has a perforating punch W inserted to perforate the bottom of the shell and must be adjusted to suit the thickness of the metal in order that it may not go through too far before the forming of the bottom takes place. The dies F, H, J, and L are held in position by the screws X. The knockout pin Z in addition to acting as such also serves as a perforating die for the fourth operation.

Progressive Dies for an Automobile Hub

The manufacture of a pressed steel automobile hub as carried out by means of the following tools

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