应用MMR的平行度几何评定  

The Geometric Evaluation of Parallelism Based on MMR

作　　者：鲁周抗 黄美发[1] 唐哲敏 宋励 LU Zhou-kang;HUANG Mei-fa;TANG Zhe-min;SONG Li(School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,Guangxi Guilin541004,China)

机构地区：[1]桂林电子科技大学机电工程学院

出　　处：《机械设计与制造》2020年第1期173-176,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目（51365009）

摘　　要：当零件的几何公差及其基准同时应用最大实体要求(MMR)时,可使零件在满足可装配性情况下降低其加工成本。然而,在这种情况下如何评定零件的几何误差,现有的物理评定方法是通过物理综合量规来进行评定,存在测量柔性小、制造成本高等问题;现有的数学评定方法仍存在很大的局限性。针对这些问题,根据零件被测要素的平行度公差及其基准同时应用MMR(简称MM平行度公差)时的工程语义以及零件平行度物理检测方法的评定机理,建立了零件相应的虚拟量具以及提出零件MM平行度的数学评定方法。可将该方法拓展到其它类型的MM方位误差的评定中。最后给出所提方法在汽车连杆MM平行度公差评定中的应用,验证了该方法的可行性。When the geometrical tolerances of the parts and its datum are applied the maximum material requirement(MMR)at the same time,the part can reduce processing costs while meeting assemblability. However,how does the geometry error of a part be evaluated when MMR is applied to the geometric tolerances of the parts and and its datum,the existing physical assessment methods are primarily evaluated by physical synthesis gauges. The physical gauge has the problems of small measuring flexibility and high manufacturing cost. The existing mathematical assessment methods still exist a lot of limitations.To solve these problems,in this paper,according to the engineering semantics of the parallel tolerance and its datum are applied the MMR at the same time(MM parallel tolerance for short)and the evaluation mechanism of the physical detection method,established the corresponding virtual measuring tools and puts forward mathematical evaluation method of parallelism of MM parts. Finally,the application of the proposed method in MM parallel tolerance evaluation of automobile connecting rod is given,and the feasibility of this method is verified.

关 键 词：最大实体要求 基准 平行度公差 误差评定 

分 类 号：TH16[机械工程—机械制造及自动化] TP391[自动化与计算机技术—计算机应用技术]