直齿轮“渗碳-温挤”渗碳层厚度分布模型

Model for the distribution of carburized case depth of spur gear in warm forming after car burizing

采用“渗碳-温挤压”工艺成形直齿轮,可使齿轮性能大幅度地提高,但经渗碳处理后的坯料,在塑性成形齿轮时,由于渗碳层流动不均匀,使齿面上不同部位渗碳层厚度不同,而沿齿面的渗碳层厚度应依据从齿顶到齿根不同工作特性的要求合理分布.通过分析齿轮失效的主要原因,提出了齿面上不同部位渗碳层厚度的基本要求,建立了直齿轮渗碳层厚度分布模型,并根据该模型,提出了采用“渗碳-温挤压”工艺加工直齿轮时坯料所需渗碳层的计算方法.研究表明:所建立的直齿轮渗碳层厚度分布模型为新工艺的实施提供了完善的目标和简明的计算方法.

Carburizing-warm extrusion″technol og y is used to produce spur gears,which can greatly improve the performance of t he later.But during the course of gear plastic forming,carburized layer of bl ank doesn't u-niformly flow,which makes different carburized case depth in di fferent zones of tooth surface.Obviously,car-burized case depth of tooth sur face should be distributed from crest to root by the need of different working spe-ciality.This paper analyzes the main cause of gear failure,and put s forw ard the basic demand on carburized case depth in different zones of tooth surfa ce.In this case,established a distribution model of carburized case depth of s pur gears was established.According to this model,a calculation method of the case depth required for the gear blanks was suggested when the carburizing-war m forming technique is applied.The research indi-cates that the distribution m odel of carburized case depth of spur gear provides a concise algorithm for app lyin g this new technology.