摘要
为提高整体叶轮数控侧铣加工的精度和效率,分析了锥形球头铣刀包络面与刀轴轨迹面之间的关系,提出了一种不可展直纹曲面五轴数控侧铣刀位优化的新算法。该算法首先利用两点偏置法确定圆柱刀初始刀位,然后通过刀轴旋转半锥角得到锥刀初始刀位,最后以刀具包络面与设计曲面间的极差最小为优化目标,采用刀轴上三点优化初始刀位。针对锥刀侧铣加工编程误差计算复杂问题,建立了一种编程误差计算新方法,并成功应用于整体叶轮的锥刀编程误差计算。通过数控加工仿真实例、实际加工试验和编程误差综合对比分析证明,所建立的刀位计算优化新算法正确有效,可显著减小编程误差。
To improve the precision and efficiency in machining the integral impeller, new cutter-location optimization algorithm was proposed for five-axis Numerical Control （NC） flank milling the undevelopable ruled surface with a conical tool by analyzing the relationships between the enveloped surface of the conical cutter and the tool axis trajec- tory surface. Firstly, the initial cylindrical tool position was determined by double points offset algorithm. Then, the initial taper tool position was obtained by rotating the tool axis at a half Cone angle. Finally, with regard to min- imize the deviation between the enveloped surface of the tool and the designed surface, three points on the tool axis were used to optimize the initial conical cutter location. Regarding the complicated calculation of programming errors in flank milling with a conical cutter, a new error estimation method was introduced to calculate the values of conical cutter programming errors, and it was successfully applied to the integral impeller programming errors calculation. Comparative analysis of NC machining simulation, cutting experiment and programming errors were conducted, which illustrated that the correctness and effectiveness of the proposed cutter-location optimization algorithm, and programming errors could be significantly reduced.
出处
《计算机集成制造系统》
EI
CSCD
北大核心
2008年第7期1386-1391,共6页
Computer Integrated Manufacturing Systems
基金
湖南省教育厅科研资助项目(06B094)
湖南省自然科学基金资助项目(07JJ6092)~~
关键词
整体叶轮
不可展直纹曲面
刀位优化
误差分析
五轴数控
侧铣
integral impeller
undevelopable ruled surface
cutter location optimization
error analysis
five-axis nu-merical control
flank milling
