Forging of Powder Metallurgy Gears

摘要

The objective of this program was to produce a very near-net shape spur gear by isothermal forging of a powder metallurgy 4600 grade preform. Die fill and densification on test coupons were complete at a forging temperature of 1650F (900C), pressure of 10 tsi (140 MPa) with a dwell time of 15 min. Materials processed in this manner exhibited toughness and ductility, comparable to that in cast/wrought material. Composite performs consisting of a P/M gear and a wrought shaft were cold isostatically pressed and sintered. Forging dies were EDM in cast IN-100 blocks. During the forging trials, however, serious problems of lubrication and die release were encountered. As a consequence, no successful forgings were produced.(Author)