人工势场法的复杂光学曲面加工最优路径求解

加工路径对于复杂光学曲面表面质量与工件光学性能具有重要影响,为此,研究人工势场法的复杂光学曲面加工最优路径求解方法,提高加工质量,并满足实际应用需求。依据等残高条件,确定复杂光学曲面加工的刀位点;以该刀位点为人工势场法求解最优加工路径时的目标点;通过在人工势场斥力场函数内引入相对速度斥力势场,改进斥力场函数,利用引力势力场函数与改进斥力场函数,确定各刀位点的合力;依据各刀位点的合力决定刀具的进给方向,即复杂光学曲面的最优加工路径。实验证明:该方法的加工精度最高为98.15%,可有效确定复杂光学曲面的刀位点,完成最优加工路径求解;应用该方法加工的复杂光学曲面工件表面粗糙度较低,加工质量较高。

应用MasterCAM优化数控车削加工路径

分析了应用G71指令、G73指令和宏程序指令编程进行凹域轴类零件加工存在的非切削空行程路径问题,阐述了应用MasterCAM软件解决该类问题的具体步骤,编制了操作流程,生成了最优加工路径。应用UG软件再次对此类零件的最优加工路径进行了验证,并通过斯沃数控仿真软件模拟了MasterCAM软件和UG软件自动化编程生成的NC程序,结果表明,应用MasterCAM软件或UG软件可以减少数控车削非切削空行程路径,提升加工效率,适用于类似零件的批量加工。

Tool selection and collision-free in 5-axis numerical control machining of free-form surfaces

The methodology of 5-axis cutter selection to avert collision for free-form surface machining by flat-end cutters is presented. The combination of different cutters is adopt aiming at short machining time and high precision. The optimal small cutter is determined based on the geometric information of the points where a cutter most probably collide with the machined surface. Several larger cutters are selected to machine the surface in order to find the interference-free area. The difference of machining time for this area between the optimal small cutter and the large cutters is calculated. The functional relationship between the machining time and the radius of a cutter is established, by which the optimal number of cutters is obtained. The combination of cutters, which possesses the minimum overall machining time, is selected as the optimal cutter sizes. A case study has demonstrated the validity of the proposed methodology and algorithms.