Jig for Heat Treatment of Ring Gear Capable of Batch Work in Carburizing Heat Treatment Furnace and Heat Treatment Process Thereby

摘要

The present invention relates to a jig for heat treatment of a ring gear capable of performing a batch operation to complete all heat treatment processes of pre-cleaning, preheating, heating, carburization, diffusion, cracking, quenching, post-cleaning and tempering in a carburizing heat treatment furnace, And a heat treatment process.;As is known, a ring gear used mainly for power transmission of a vehicle is subjected to press quenching inevitably due to the deformation of the rear surface in the quenching process, and this press quenching is performed in the inner ring of the ring gear, An outer ring on the outer side of the tooth, and an expander and a punch on the side of the tooth root, and then quenched while being pressed under a certain pressure.;In order to perform such presser quenching, the ring gear which is inevitably machined is pre-cleaned, preheated, heated, carburized, diffused and cracked, and the ring gear is opened and the ring gear is taken out and then charged into a separate quenching machine to quench. It is difficult to control the atmosphere. In the process of handling such a ring gear, the wear of the ring gear becomes heavy, which makes it difficult to perform the operation. In addition, when the ring gear is dropped in this process, There are many problems such as being a defective product.;The present invention provides a separate annular plate below the support of the jig used for quenching so that the oil circulated in the quenching process is stagnated so that the back surface of the ring gear is cooled at a slower rate than other parts where oil is circulated The amount of deformation can be reduced so that the operation of pressing the ring gear with the inner ring, the outer ring, the expander, the punch, and the like is unnecessary, so that the quenching can be completed in the quenching tank of the carburizing heat treatment furnace, By allowing the whole process to be carried out, the burden of labor costs can be reduced and a stable quality product can be produced.