Irregularly-shaped hole spiral gear once forming mold

Abstract

The invention discloses an irregularly-shaped hole spiral gear once forming mold which comprises an outer upper punch, and an inner upper punch is arranged in the outer upper punch. The mold further comprises a middle mold, and the middle mold is provided with a helical gear pressing blank, the mold further comprises an outer lower punch, an inner lower punch is arranged in the outer lower punch,a core rod is arranged in the outer lower punch and the inner lower punch, the inner upper punch and the inner lower punch are circular, and the inner upper punch, the inner lower punch and the core rod are fixed together to be free of rotation. According to the irregularly-shaped hole spiral gear once forming mold, the circular inner punches are designed and are fixed to a mold frame to be free of rotation, only the outer upper punch and the outer lower punch rotate during molding, the irregularly-shaped core rod, the inner upper punch and the inner lower punch are fixed together to be free of rotation, irregularly-shaped inner hole alignment is achieved, a spiral gear powder metallurgy pressing blank with an irregularly-shaped inner hole is formed at a time, the subsequent grinding processing technology is reduced, the manufacturing cost is reduced, and the significant economic benefits are achieved.

Description

technical field [0001] The invention relates to a mold, more precisely, a one-time forming mold for a helical gear with a special-shaped hole. Background technique [0002] For helical gear molds with special-shaped inner holes, the upper punch is generally designed as a solid or round hole, the upper part of the mandrel is round, and the lower part is shaped. According to this design, the inner hole of the formed helical gear compact is a blind hole or a round hole in the upper section. The compact needs to be about 0.2 mm higher than the finished product, and then it is processed into the final product by grinding, and the manufacturing cost is relatively high. Contents of the invention [0003] The invention mainly solves the technical problems existing in the prior art, thereby providing a one-time forming die for the helical gear with a special-shaped hole. [0004] Above-mentioned technical problem of the present invention is mainly solved by following technical sch...

AI Technical Summary

Problems solved by technology

According to this design, the inner hole of the formed helical gear compact is a blind hole or a round hole in the upper section. The compact needs to be about 0.2MM higher than the finished product, and then it is processed into the final product by grinding, and the manufacturing cost is relatively high.

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