面向航发叶片同步抛光的型面聚类分组方法

A Profile Clustering-based Grouping Method for the Synchronous Polishing of Aero-engine Blade

叶片是航空发动机核心零件,其制造能力的提升是航空制造业关注的重点。在多主轴阵列机床高效加工的技术背景下,针对批次叶片实际型面一致性不佳造成的同步定轨迹抛光质量不足问题,提出了基于形状的叶片型面聚类分组方法。首先,依据抛光去量与预压量关系确定组内叶片容许差异。其次,依据抽样叶片实际型面差异确定分组标志点分布。然后,将两两叶片型面的一致性表示为分组标志点实测数据的向量差,在组内叶片容许差异约束下以Ray-Turi指数为目标确立最优分组。最后,以批次叶片为对象验证了所提聚类分组方法的有效性。验证结果表明该方法可提高批次叶片分组后实际型面的组内一致性(实例为0.0985 mm内),组间超容许差异区域所占比例达到16.67%以上。对分组后叶片进行同步抛光,截面线轮廓度≤0.054 mm,且相同位置处抛光后精度差异≤0.021 mm,从而说明了该方法有助于实现批次叶片的高质量多主轴同步抛光。

Blade is the core component of aero-engine,which manufacturing capability improvement has always been the focus of aviation manufacturing industry.With the high-efficiency machining of multi-spindle array machine tool,a profile clustering-based blade grouping method is proposed,aiming at the insufficient quality of synchronous polishing caused by poor consistency of actual profile.Firstly,the allowable intergroup difference is determined by the relationship of polishing indentation and removal depth.Secondly,the distribution of grouping points is determined by the profile difference of sampled blades.Thirdly,the profile consistency of two blades is expressed as the vector difference of measurement data for grouping points,and the grouping result can be established with the Ray-Turi index and allowable intergroup difference.Finally,the grouping and polishing experiment for batch blades has been performed to demonstrate the effectiveness of the proposed method,and the results show that it can improve the profile consistency within each group(less than 0.0985 mm for the experiment).The area exceeding the allowable intergroup difference between groups is more than 16.67%.After multi-spindle array polishing,the cross-sectional profile of intergroup blades is less than 0.054 mm,and the precision difference at the same position is less than 0.021 mm,which shows that the proposed method is helpful to realize high-quality multi-spindle synchronous polishing of batch blades.