A Study of Die Fracture in Cold Bulk Metal Forming
A reduction of tool costs is of decisive importance for an economical production in metal forming. For this purpose, a reduction of the absolute costs of tools as well as an increase of tool life should be achieved. Tool failure should either be avoided or it should be made predictable for reducing costs by interrupted production. Until now, however, in many cases a continuous production is disturbed by the large scatter of tool life. In cold extrusion, tool failure is often caused by fracture, especially in cases of complicated shapes of the workpieces.
In the present work crack initiation and growth have been studied in solid forward extrusion dies after various kinds of heat treatment of the tool steel. The mechanical properties of specimens of the tool steel were related to the tool life in extrusion tests under simulated production conditions.
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