工程陶瓷车削刀具磨损机理及理论模型的研究

Study on Mechanism and Theoretical Model of Tool Wear in Engineering Ceramics Turning

通过二硅酸锂玻璃陶瓷的切削实验,依据摩擦学原理,结合犁沟效应从微观层面讨论了陶瓷材料对切削刀具磨损机理的影响.通过引入陶瓷晶体相关参数,揭示了陶瓷晶体的形貌和排布方式在车削过程中对刀具磨损量的影响,使磨损机理应用更具广泛性和直观性.结合几何学和运动学分析,建立了工程陶瓷材料车削刀具体积磨损量模型,并进行了实验验证.理论和实验结果均表明随切削路程的增大,刀具体积磨损量先表现为稳定增加,随后由于磨损面的不断增加以及热量堆积导致黏结磨损现象的出现,刀具磨损速度急剧加快,最终导致刀具刃缘崩碎而失效.

Based on the tribological principle and furrow effect,the effect of ceramic material on the wear mechanism of cutting tools was discussed by cutting experiment of lithium disilicate glass ceramics.By introducing the related parameters of ceramic crystal,the influence of the morphology and arrangement for ceramic crystal on the tool wear in the turning process was revealed,which made the application of wear mechanism more extensive and intuitive.Based on geometric and kinematic analysis,a model of the tool wear of turning tools for engineering ceramics was established and tested.Both the theoretical and experimental results show that,with the increase of cutting length,the wear volume first shows a steady increase,and then due to the increasing wear surface and the heat accumulation causes the phenomenon of bond wear,the tool wear speed increases sharply,and finally leads to the tool edge breakage and failure.