Machining Powder Metallurgy Materials
Final technical rept.
MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF MECHANICAL ENGINEERING AND ENGINEERING MECHANICS
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Powder metallurgy PM products eliminate the need for most machining however, many PM Components do require some machining and little is known about the machinability of these materials. Toward providing guidelines for machining PM materials, machining tests were conducted on low and high density PM steel AISI 4640 specimens. Results of these tests are presented along with data on conventionally wrought AISI 4140 steel. The preference for low alloy steels in the manufacture of weapon components led to the choice of these materials for the investigation. Significant differences in cutting forces were experienced in the cutting of high and low density PM materials. The maximum practical cutting speed in drilling was higher for low density PM material than that for high density material. Tool wear in the reaming of PM materials was negligible. In drilling, improvement of hole geometry by sequential machining operations varied greatly. Boring with a rigid bar gave the best geometry. Hardness of the material had decisive effect on machinability. Relatively burr-free holes could be drilled in PM materials. Overall machinability of the investigated materials did not show significant differences. Author
- Metallurgy and Metallography
- Fabrication Metallurgy