| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily and inexpensively manufacturing a three-dimensional cam, and to provide a powder-molding apparatus used therefor. SOLUTION: A targeted shape has a recess 6 having a depth and a width increasing toward a cam nose portion 3, positioned in a semicircular periphery of a hollow circle 7 for a camshaft on each of the top and bottom faces and of the cam nose portion 3 side. The manufacturing method comprising pressing a powder from only an upper side to obtain a compact 5 which has a higher density in the upper side than in the bottom side, and a higher density in the bottom side of the cam nose portion 3 than in the bottom side of a cam base portion 2; and sintering the cam to form the tapered shape due to a difference between the densities and to obtain a finally aiming three-dimensional cam 1. COPYRIGHT: (C)2005,JPO&NCIPI
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