Precision cold die forging of helical gear for actual automobile by multi-action press

摘要

This report deals with a new near-net shape forging process for automobile transmission helical gear by using a multi- action hydraulic press which has been recently set up in Kokura Steel Works. An actual automobile helical gear with completely filled tooth-tops was formed successfully by adopting divided flow Method. The accuracy for the gear was in JIS 2 or 3 grade and the forming pressure was as low as 3.3 times the material's flow stress.