基于MLS拟合带容差的测量数据加工刀位面生成算法  

An Algorithm for Tolerance Cutter-location Surface Generation of Measured Data Based on MLS Method

作　　者：李向佳[1] 戴宁[1] 廖文和[1] 郭保苏[1] 王永波 

机构地区：[1]南京航空航天大学,南京210016 [2]山东新华医疗器械股份有限公司,淄博255086

出　　处：《中国机械工程》2015年第8期1040-1047,1057,共9页China Mechanical Engineering

基　　金：国家科技支撑计划资助项目(2012BAI07B04);国家自然科学基金资助项目(51205192;81271181);国家高技术研究发展计划(863计划)资助项目(SS2013AA040801-02);南航科研基地创新基金资助项目(NJ20130015)

摘　　要：传统的刀位面生成算法无法直接生成存在缺陷的离散数据的刀位面,因此,针对球头铣刀提出了一种基于MLS拟合带容差的离散数据加工刀位面生成算法。该方法首先依据球头铣刀构造离散数据的点膨胀球模型,然后根据凸包原理获取该模型的最外层包络面,最终通过MLS投影拟合方法剔除奇异点、修补裂缝,生成刀位面网格模型。实例表明,该算法具有较高的稳定性,能够有效解决存在缺陷的离散数据刀位面生成问题,适用于实际工程应用加工。Traditional offset method can not directly generate the cutter-location surface of meas- ured data with defects. Thus, a tolerance method of cutter-location surface generation was proposed based on MLS fitness. Firstly, the measured data were transformed to a swelling ball model by the length of ball-end cutter＇s radius. Secondly,according to the geometric principle of convex hull,outer envelope data of this swelling ball model were acquired. Finally, local MLS projection fitting method was used to eliminate possible defects, and generated the final cutter location mesh surface. It is shown that this algorithm is able to generate cutter-location surface of measured data even they have defects, and also is suitable for the practical engineering applications for its high efficiency and accuracy.

关 键 词：移动最小二乘法 容差 测量数据 数控加工 刀位面 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]