Quick die change by David A. Smith

By David A. Smith

Speedy die swap is a fancy method that's very important to the fashionable press store and crucial for preserving product uniformity, caliber and profitability. This e-book, written through press and die specialist, David Smith, is stuffed with engineering information, sound administration rules, and the background and idea in the back of speedy die switch. This publication is a superb reference instrument for complex die setters, engineering managers, creation managers, production engineers, and a person drawn to enhancing their die atmosphere and altering operations

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All that may be required is to drill bolt holes or mill slots for bolts in the die shoes. Even so, realistic amounts of time and money needed to do the work should be budgeted. Don’t forget the need to lay out the machine work needed on the die shoes while they are in the press. This step ensures accurate hole or slot locations. • Often parallels and subplates must be permanently attached to the dies to save setup time. While old dies can be a good source of surplus parallels and plate, there is usually a limit as to how much any shop’s junk pile can be relied upon as a source of material.

Figure 3-3 Figure 3-3. A slit coil of steel with sweep or camber is a frequent cause of feeding and process variability problems. 42 Quick Die Change illustrates a slit coil of steel with sweep or camber. Steel mill rolling operations require a slight crown or increase in center thickness to track down the center of the rolling mill. Final rolling may cause the full coil from which strip coils are slit to have internal stresses. These stresses were due to normal rolling practices but can be all but eliminated by stretcher leveling at the mill or steel-processing center.

When a slug becomes embedded in the die shoe and bolster, the die clamps loosen. Slugs underfoot are a slipping hazard. All slugs must be cleaned up before proceeding with setting a new die. Slugs can Damage Dies The out-of-parallel condition caused by slugs under a die can result in die damage. Figure 4-4 illustrates a type of damage that can occur to cutting dies. The damage is not confined to cutting edges. Setup blocks can literally be buried into the die shoe. Figure 4-5 illustrates how this occurs.

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