PURPOSE: To allow mass production of gears by housing a stock heated to a molding temp. into a die, closing the die and pressurizing the stock vertically to allow a part of the stock to flow into the cavity to mold the tooth parts.

CONSTITUTION: The circular cylindrical stock 1 is slightly heated and is precoated with the graphite. The stock 1 is further heated to a prescribed temp. and is housed into the die 2 to close the spacing between the upper die 2a and the lower die 2b. A punch 2c is provided in the upper die and a knock-out 2d and a cylindrical knock-out 2e around the same are provided double in the lower die 2b. The punch 2c in the upper die descends upon closing of the upper die 2a and the lower die 2b. The stock 1 is pressurized between the punch 2a and the knock-out 2d and the stock is partly allowed to flow into the cavity 2f to mold the gear 3a. A part of the stock arrives at the cavity 2g and the tooth parts 3b are molded when the stock is pressurized by further lowering the punch 2c. The molding of the gear 3 is completed when the punch 2c arrives at the bottom dead point. The gear which is free from underfill in the tooth parts is easily obtd. in this way even with a small-sized press.