摘要:
To manufacture a tappet in an internal combustion engine, a tappet rough body which comprises a cylindrical portion (2) with an upper wall (1) and an annular side wall (6) is moulded by press processing of metal powder, such that the upper wall (1), the cylindrical portion (2) and the annular side wall (6) become larger than the tappet to be manufactured in the axial size. After sintering the tappet rough body, it is re-compressed to form the final tappet.
摘要:
In a method of manufacturing a tappet for an internal combustion engine, powdered metal "P" filled in a cavity 22 of a die 21 is compressed by lower and upper punches 23 and 25 to form a body and a top wall of the tappet, and is sintered. During compression molding, frictional resistance of powdered material increases density of the upper and lower ends of the tappet, thereby improving strength and wear resistance.