铣刀磨损对铣削稳定性及表面位置误差的影响

为了分析刀具正常磨损后铣削颤振稳定域和表面位置误差,对刀具不同磨损状态下的切削力系数进行辨识,基于全离散法研究刀具正常磨损后铣削颤振稳定域和表面位置误差特性。发现当刀具正常磨损后,铣削系统的稳态临界切深呈现上升的趋势;随着工件表面洛氏硬度的提高,铣削系统稳态临界切深逐步下降,刀具正常磨损后临界切深与后刀面无磨损临界切深的差别逐步变小;在稳定域的局部会出现表面位置误差增加的情况。试验表明,该理论模型可以有效优化刀具正常磨损后的加工参数。

The Influence of Wear Loss of Milling Cutter on Milling Stability and Surface Location Error

To analyze milling chatter stability lobes and surface location error with worn tools, the cutting force coefficients under different worn conditions are identified using the full-discrete method. The stable critical cutting depth of the milling system increases after normal wear, and gradually declines as the work piece surface hardness increases. Then, the difference in the critical cutting depth between the normal wear tool and the wear free tool flank gradually becomes small. In addition, surface location error appears in some stable regions. Experimental results prove that the theoretical model can effectively optimize machining parameters with varying wear loss of the milling cutter.