| 摘要 |
A machine for forging the leading end of a metal screw blank comprising two pairs of complementary dies, one die of each pair of which is stationary and the other movable to and from the stationary die. The stationary dies are supported on opposite sides of a stationary die support and the movable dies on discrete movable die supports at opposite sides of the stationary die support. The movable die supports are connected to form a movable die assembly, are supported by linear ball bearings on cylindrical ways and are reciprocated as a unit by a pitman connected to a crankshaft by roller bearings, thus providing for the production of a forged blank upon each 180 DEG rotation of the crankshaft. The movable die supports are adjustable relative to the stationary die support and the roller bearings have preload adjustments that make it possible to maintain a precise clearance between the respective dies of each pair in their closed position within one hundred twenty seven thousandths of a millimeter (0.127mm) or five-thousandths of an inch (0.005 inch) or less thus prolonging die life and allowing for the use of carbide dies.
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