Quench hardening of gears

摘要

A method of quench hardening a gear having a gear rim, a hub, and two rim carrying gear disk includes carburizing the gear and quenching it subsequently in a saline bath, and is improved by releasably covering the perforated disks with perforated supplemental disks, the perforations are closed during carburization but open during quenching. The gear is turned about its vertically positioned axis during quenching; the supplemental disks are removed subsequently so that the gear disks are not carburized.