基于STEP-NC的NURBS曲面插补五轴数控系统  被引量:2

5-axis NC systems with interpolator for NURBS surface based on STEP-NC

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作  者:梁宏斌[1] 李霞 LIANG Hongbin;LI Xia(School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan 114051, China;School of Mechanical and Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区:[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051 [2]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001

出  处:《计算机集成制造系统》2018年第4期917-925,共9页Computer Integrated Manufacturing Systems

基  金:国家自然科学基金资助项目(50675002;51075078);辽宁省自然科学基金资助项目(2015020128)~~

摘  要:针对当前STEP-NC尚不能完善地支持多轴曲面加工问题,定义了STEP-NC中的自由曲面五轴加工指令,研究了非均匀有理B样条(NURBS)曲面实时五轴插补技术,建立了数控系统的运动学模型,并在上述理论研究的基础上完成了数控系统的软件设计;建立了五轴数控试验样机,并进行了NURBS曲面零件的切削实验。实验结果表明,所提出的基于STEP-NC的NURBS曲面五轴加工指令及NURBS曲面五轴加工的运动学模型的正确性;所给出的NURBS曲面插补算法适用于凸凹曲面加工;所构建的五轴铣床样机具有很好的曲面加工性能。To solve the problem of adapting STEP-NC technology to multi-axis surfaces machining,the instruction for 5-axis machining of freeform surface was defined in STEP-NC data model,the 5-axis real-time interpolation for NURBS surface was researched,and the kinematics model of CNC system which included path planning,tool offset,real-time interpolation and inverse of Kinematics transformation was built up.On these bases,the software of CNC system was implemented,and the 5-axis prototype milling machine with the experiment for cutting NURBS surface part were developed.Experimental results showed that the definition of instruction in STEP-NC and the proposed kinematics model for 5-axis NURBS surfaces machining were correct,the interpolation algorithm was applicable for machining of convex and concave surfaces,and the prototype for 5-axis milling had good performance of cutting free-form surfaces.

关 键 词:STEP-NC NURBS曲面 插补 五轴加工 数控系统 

分 类 号:TP319[自动化与计算机技术—计算机软件与理论]

 

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