缓进深磨的温度特征与烧伤机理

The Workpiece Temperature Characteristics and Burn Mechanism in Creep Feed Grinding

缓进深磨作为一项新工艺目前仍处在机理研究落后于生产应用,其潜力尚不得充分发挥的阶段。以与制件烧伤直接相关的缓磨温度的研究为例,国外一直存在着多种相矛盾的观点,且认为缓磨烧伤系瞬间发生因而难于预报和控制。本文在解决测试方法完善实验技术基础上,对缓磨时接触弧区的温度分布及其变化特征作了充分研究,所提供的烧伤前后弧区制件表面温度的时空分布图,在阐明缓磨时的温度特征与烧伤机理上具有重要的理论价值。另外,实验得出的缓磨烧伤是具有足够长时间的典型缓变过程的结论,对在实际生产中预报和监控烧伤亦有指导意义。

Creep feed grinding is a kind of aew technique which has tremendous potentialities in production. However its potentialities have not yet been fully developed, because the research on its mechanism lags behind in the productive application. There are a lot of contraversies existing abroad a out the view points of creep feed grinding temperature directly related to the workplace burn. It is considered that since the workpiece burn suddenly takes place in creep feed grinding, it is difficult to predict and control the burn in practice. In this paper, a unique experiment is developed for investigating the temperature distribution and its variance characteristics in the contact zone during creep feed grinding on the basis of improving experimental technique in instrumentation. The workplace surface temperature-time-space distribution curves in the developing process of the workpiece burn can be used in clarifying the temperature characteristics and the burn mechanism in creep feed grinding. According to the experiments,there exists a sufficient time interval for a typical gradually developing process from low surface temperature in normal condition to burning temperature in the contact zone during creep feed grinding. Therefore the prediction of workpiece burn can be realized in production.