| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-accuracy sintered cam lobe material which has a high wear resistance and pitching resistance, and has high dimensional accuracy and does not require grinding after assembly even in the case the cam lobes of intricate shapes are manufactured and a method for manufacturing the same. SOLUTION: The high-accuracy sintered cam lobe material is obtained by repeating compression molding and sintering of powder for sintering one or≥2 times to form the powder to a prescribed shape and by tempering the molding at need. The sintered cam lobe material consists of an iron-based sintered alloy consisting of one or both of 0.3 to 5.0wt% Ni and 0.2 to 4.0wt% Cu, 0.1 to 1.2wt% C and the balance inevitable impurities and Fe. The density thereof is 7.3 g/cm<SP>3</SP>, the outer peripheral hardness of the cam is HRC≥45 and the dimensional change rate of the sintered compact obtained in the final sintering step for the molding obtained in the final compressing step is within±0.5%. COPYRIGHT: (C)2004,JPO |
