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A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to prevent the punch from sticking in the die and so less force is needed to make the hole.
The punch/die clearance is a crucial parameter, which determines the load at the cutting edge of the tool, commonly known as point pressure. Excessive point pressure can accelerate tool wear. The surface quality of the trimmed piece is affected by the clearance, too.
Clearance between the punch and die guides the flow of the metal into the die. Clearance should be more than the metal thickness to avoid concentration of metal at the top of the die cavity. Clearance should not be as large so that the flow of metal into the die region becomes unrestricted leading to the wrinkling of wall. [1]
Punch Holder: This plate is used to accommodate the punches of press tool. Punches : To perform cutting and non cutting operations either plain or profiled punches are used. Die Plate: Die plate will have similar profile of the component where cutting dies usually have holes with land and angular clearance and non cutting dies will have profiles.
A punch (or moving blade) is used to push a workpiece against the die (or fixed blade), which is fixed. Usually, the clearance between the two is 5 to 40% of the thickness of the material, but dependent on the material.
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A properly sharpened die, with the correct amount of clearance between the punch and die, will produce a part that holds close dimensional tolerances in relationship to the part's edges. Appearance. Since the part is blanked in one operation, the finish edges of the part produces a uniform appearance as opposed to varying degrees of burnishing ...
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