薄壁圆筒零件车铣复合加工稳定性分析
Stability Analysis of Turn-milling Machining of Thin-wall Cylinder Parts

某靶弹控制仓壳体为镁合金材料薄壁圆筒类零件，相对于传统车削工艺，车铣复合加工工艺具有主轴转速高、切削力小及切削温度低的特点，能有效降低镁合金材料的切削温度、提高加工效率及保证加工质量。针对靶弹壳体车铣复合加工稳定性研究与参数优化，建立考虑变切深变切厚的铣削力模型，利用有限元模型分析工件不同加工阶段和加工位置的动力学响应特性，结合模态锤击法得到的刀具端频响函数，建立XYZ方向的车铣复合加工稳定性预测模型。通过全离散法求解得到不同加工阶段下的稳定性lobe图，结果表明不同加工阶段下具有不同的稳定性加工边界，通过分阶段优化加工参数，可以在稳定加工的前提下提高加工效率。
The shell part of target cartridge controls is a magnesium alloy thin-walled cylinder part. Compared with the turning, the application of turning-milling complex technology has the characteristics of high spindle speed, small cutting force and low cutting temperature, which can effectively reduce the cutting temperature of magnesium alloy material, improve processing efficiency and ensure processing quality. For the turn-milling machining stability analysis and parameters optimization of the target outer, the milling force model considering the variation of the cutting depth and width is established. The dynamic response characteristics of the workpiece on different processing stages and processing positions are analyzed with finite element methods. Combining the frequency response function of the tool point obtained by the modal impact method, a stability prediction model of turn-milling complex machining is established on the XYZ directions. The stability lobe diagrams under different processing stages are obtained by the full discrete method, and the results show that a different processing stage is corresponding to different stability lobe diagram. The processing efficiency can be improved by optimizing the machining parameters under every processing stage