Powdered metal multi-lobular tooling and method of fabrication
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United States of America Patent
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Issued Date -
Oct 13, 2005
app pub date -
Feb 7, 2005
filing date -
Apr 13, 2004
priority date (Note) -
Abandoned
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Abstract
A tool made of powdered metal, such as a modified T15 HSS in powdered form, and having a multi-lobular end profile for punching multi-lobular recesses into workpieces, such as into the heads of fasteners. The tool is homogenous and contains only carbides which are relatively small, such as in the 1-4 micron range. Also provided is a method of fabricating such a tool. The method requires that a powdered metal bar is cut and then the cut piece is worked to provide the multi-lobular tool. The final part is theoretically 100% dense, as opposed to being only 95-98% dense as in metal injection molded parts. In use, the final part, due to how it is fabricated, has increased column strength and increased impact resistance.
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