高速铣削时刀夹联体振动特性影响后刀面磨损机理

Mechanism of the Tool Flank Wear Influenced by the Vibration Characteristics of the Toolholder System in High Speed Milling

通过对主轴-刀夹-刀具联体的振动特性及切削过程分析,研究高速铣削时后刀面机械振动磨损的机理。采用试验模态分析方法,获得刀夹联体的振动特性参数。分析刀尖的振动轨迹曲线以及有效切削后角随时间的变化规律,找出振动特性参数与后刀面磨损的关系。进行刀夹联体的振动特性参数影响后刀面磨损的切削试验。试验结果证明:在高速铣削硬钢材料时,刀夹联体的模态阻尼比和固有频率的乘积值越大,动刚度越高,后刀面振动磨损程度就越轻。

Based on the analyses of the vibration characteristics of the spindle/tool-holder/tool system and the cutting processes, the mechanism of the tool flank wear influenced by the system＇s mechanical vibration is studied. The experimental modal analysis method is used to obtain the system＇s modal parameters. The vibration locus of the tool tip is analyzed and also the behavior of the change of the effective end-relief angle along the locus with the cutting time. We found out the relationship of the modal parameters and the tool flank wear. Cutting tests were done for the tool flank wear influenced by the modal parameters. Testing results prove that in high-speed milling hard materials the higher the value of the dynamic stiffness and the product of the modal damping and natural fi＇equency, the less the tool flank wear influenced by the system＇s vibration, and vice versa.