Abstract: A process for manufacturing toothed parts having a tooth profile on a portion of their outline. The process utilizes a press machine having top and bottom die sets with stock interposed therebetween at uniform intervals in sequence with the vertical operation of the press machine. The process includes a first step wherein a center hole is stamped in said stock and, a second step wherein a window hole corresponding to the exterior peripheral tooth profile is stamped in said stock using the center hole as a reference, a third step wherein a tooth profile having a tooth width greater and a tooth height lower than the final tooth profile is rough-formed on one side of said window hole, and a fourth step wherein the exterior periphery of said rough-formed toothed part undergoes stamping and ironing operations concurrently with the processing of the final tooth profile.

Abstract: The present invention relates to a spur gear automatic production process wherein spur gears are cold-press formed. The invention provides a top and bottom table with stock fed therebetween in sequential operation with the vertical stroke of the press machine, stamping a disk-shaped gear workpiece by means of top and bottom die sets in the first section which are positioned for integrated movement, thereafter moving said gear workpiece to the second section by means of an unobstructed feed, stamping thereon the tooth profile by means of the vertical stroke of top and bottom die sets positioned in said second section, and ironing said gear workpiece in the reverse direction to the stamping process.

Abstract: The present invention discloses a manufacturing process whereby a spur gear is cold-press molded. By means of the invention a pre-punched workpiece is loaded on a counter which is admitted to a bore in a female die having a chamfer at its inlet, pressure is applied on the workpiece through the bore in the female die by means of a punch when pressure is increased from below so as to lift the counter from the counter plate, a primary product is formed by means of causing said workpiece to descend so as to transit the chamfer, extracting said primary product from the female die and reversing its orientation top to bottom, and repeating the identical process once again.

Abstract: The present invention relates to a process for the manufacture of parts having a tooth profile and boss by means of a press machine. The process of the present invention comprises a blank with a boss, which is produced in a prior operation by machining, cold forging, warm forging or other method, being positioned on a female die having a tooth profile formed thereon on a mirrored surface, said female die having a 20.degree.-150.degree. taper at its inlet, and having a shape conforming to the bottom configuration of said blank, and wherein an ironing process is performed by means of a punch having a shape conforming to the top configuration of said blank.