China Mechanical Engineering ›› 2011, Vol. 22 ›› Issue (17): 2022-2026.

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Curvature Fitting and Changing-TCpoints Based 4-Axis Grinding Algorithm

Mao Lei1;He Wei2;Zhou Jie1;Luo Guangjin2;Hu Xuxiao1;Zhou Zheping2
  

  1. 1.Zhejiang University,Hangzhou,310027
    2.Hangzhou Machine Tool Group Co., Ltd.,Hangzhou,310022
  • Online:2011-09-10 Published:2011-09-14
  • Supported by:
     
    National Science and Technology Major Project ( No. 2009ZX04014-026-04);

基于曲率拟合及变刀触点的防干涉四轴磨削算法

毛磊1;何卫2;周洁1;骆广进2;胡旭晓1;周哲平2
  

  1. 1.浙江大学,杭州,310027
    2.杭州机床集团有限公司,杭州,310022
  • 基金资助:
    国家科技重大专项(2009ZX04014-026-04)；高等学校博士学科点专项科研基金资助项目(200803350028)；浙江省科技重大专项(2008C01026-1) 
    National Science and Technology Major Project ( No. 2009ZX04014-026-04);

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Abstract:

Aiming to the local interferences when grinding a curved surface in 4-axis CNC grinder, a method of interference detection and elimination was proposed based on an arcs surface grinding wheel. Through the analysis of interferences,firstly the optimum relative wheel-pivot was determined to avoid the undercutting according to the fitting requirements of curvature. Then the appropriate tool contact point (TCpoint) was found on the basis of the normal vector of grinding contact points (GCpoints),so that the axial interference is eliminated. Finally,a grinding simulation system was developed with UG OPEN API. The results indicate that surface errors are less than 0.05mm. 

Key words: local interference, arcs surface grinding wheel, curvature fitting, optimum wheel-pivot orientation, changing-TCpoints

摘要：

针对四轴数控磨削机床加工复杂曲面时的局部干涉问题,提出一种基于圆弧面砂轮的干涉检测与消除方法。基于对两种局部干涉的分析，首先根据曲率拟合要求确定最佳的相对刀轴方向以避免过切干涉，然后根据磨削点的法向量确定合适的刀触点以避免轴向干涉。利用UG OPEN API通过二次开发完成叶片叶盆表面的加工仿真,仿真结果表明,该方法切实可行，表面加工误差可小于0.05mm。

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