作　　者： ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《华南理工大学学报（自然科学版）》 2004年第10期15-19,共5页

摘　　要： 根据对中碳钢所进行的高速车削实验的观察 ,对高速车削工件表面微观形貌和表层微观结构的形成过程及其特征进行了分析研究 .结果表明 ,切削速度和材料硬度是决定切削过程中材料变形的主要因素 ,切削热使被切削材料产生高温软化 ,形成特有的工件表面犁垄和熔融金属涂抹现象 ,工件表层材料因切削高温出现二次淬火及回火现象 ,显微硬度发生改变 ,并出现了硬脆的白层组织 .切削过程中的刀—工相对运动和切削热现象对已加工表面的形成起着至关重要的作用 ,随着切削用量增大 ,切削热和摩擦热增大 ,形成了高速车削工件表面特有的微观形貌和表层微观结构 . Based on the experimental observations of the high-speed turning for medium carbon steel, the forming courses and characteristics of the microtopography and microstructure of the workpiece surface were analyzed. The results show that the cutting speed and material hardness are the main factors affecting the material deformation in the high-speed cutting process, and the cutting heat makes the material in the cutting zone soften as well as causes particular furrows and side flow on the workpiece surface. It is also shown that there exist a second quenching and tempering due to the high cutting temperature, thus causing the change of the micro-hardness and the appearance of a hard and fragile white-layer contexture on the workpiece surface. The motion between the cutting tool and the workpiece, along with the cutting heat greatly affects the formation of the machined surface profile, that is, with the increasing of cutting parameters, the cutting heat and the friction heat increase, thus forming the particular microtopography and microstructure of the workpiece surface machined with high-speed turning.

关 键 词： 高速车削 表面质量 微观形貌 微观结构 进给运动

领　　域： [金属学及工艺]