切削温度与工件微观组织性能间的影响机制研究  

Influence mechanism between cutting temperature and microstructure performance of the work-piece

作　　者：闫国栋[1] 冯勇[1] 贾丙辉[1] 

机构地区：[1]南京工程学院机械工程学院,江苏南京211167

出　　处：《制造技术与机床》2017年第1期112-117,121,共7页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金(51275227);江苏省自然科学青年基金(BK20131341;BK20150728);南京工程学院引进人才科研启动基金(YKJ201302);南京工程学院创新基金重大项目(CKJA201601)

摘　　要：以ANSI1045钢为研究对象,通过K型热电偶、测力仪及激光共聚焦显微镜等仪器设备,构建了单次/连续复合切削试验系统,获得了切削温升和衰减规律,并在此基础上研究了工件表面的动态微观组织变化,进而分析了单次/连续切削温度累积和衰减规律变化对工件微观组织性能的动态影响机制。研究表明,切削温度上升过程中,在接近723℃左右发生了由珠光体向奥氏体转变的不稳定态,且工件存在局部热软化效应;切削温度下降过程中,会出现少量较大尺寸的片层珠光体团和网状铁素体组织,造成连续切削温升率、表面粗糙度明显高于单次切削,而表面硬度低于单次切削。所涉方法和结论可为实现碳钢材料的精密绿色加工提供参考。A composite single/continuous cutting experimental system is constructed,which consists of the K type thermocouple,measuring instrument and confocal scanning laser microscope.The rise and attenuation pattern of cutting temperature for cutting ANSI1045 steel and the dynamic microstructure changes of the work-piece surface are obtained based on the experimental system.Further,the dynamical influence mechanism between cutting temperature and microstructure performance of the work-piece is analyzed.Research shows that the unstable state of pearlite changing to austenite was occurred at near 723℃ during the process of cutting temperature arising,and the local thermal softening effect of work-piece was observed,and a little chip shape pearlite colony and the net shape ferrite were observed in the process of cutting temperature descending.Based above,the temperature rising rate and surface roughness of continuous cutting are significantly higher than the single cutting,while the surface hardness is lower than the single cutting.The theory and method in this paper can be provided as theoretical reference for the green precision manufacturing of carbon steel materials.

关 键 词：连续切削 切削温度 ANSI1045钢 微观性能 工件 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]