夹具设计中文对照.doc

Optimization of fixture design with consideration of thermal deformation in face milling 考虑端铣中热变形的最佳化夹具设计 Huang, Ying Abstract 摘要 Effective methods of fixture design are proposed to reduce machining error caused by cutting heat in face milling. Experiments show that thermal effect is critical to final error in the finish cut and that it dominates cutting accuracy. Therefore, a mathematical model is structured of the cutting heat source on behalf of the cutting tool, and the flatness error generation process in face finishing is demonstrated by computational simulation based on the moving cutting heat source model with FEW Concerning surface flatness due to the moving cutting heat source for relatively thin plate-shaped workpieces, different methodologies have been proposed to reduce flatness error, namely, the application of additional supports and optimization of the fixturing support layout. Cutting experiments and computational analyses show the effectiveness of the additional supports and the optimization methodology applied on the fixture design in view of flatness error due to cutting heat. The proposed methodologies are applicable and beneficial to improve cutting accuracy not only of plate-shaped workpieces but also of other geometry workpieces. 用于减小端铣中因切削热而引起的加工误差的有效的夹具设计方法已经被提出。实验表明热效应决定了精加工中的精加工误差并且主导者切削精度。因此，一个以切削热源代表切削刀具的数字化模型被构建起来，在端面精加工中平面误差产生的过程已经被基于运动切削热源模型与FEW关于相关的薄金属板成型工件由于运动切削热而引起的表面粗糙度，不同的减小表面误差的方法已经被提出，即附加支撑的用于与工件夹具支撑最佳化设计。切削实验及计算分析说明附加支撑的有效性及最佳化方法学在夹具设计中的应用是因为由切削热产生的表面误差。这种方法对于提高切削精确度不仅对于金属板成型工件，而且对于其他几何工件都是有效有意义的。 Keywords: Optimization, Fixture Design, Thermal Deformation, Flatness Error, Face Milling 关键词：最佳化，夹具设计，热变形，平面误差，端铣 Introduction 介绍 In advanced automation of relatively high product mix and low repetitive machining center work, fixture preparation becomes a bottleneck problem in terms of production cost and lead time. To assist fixture preparation in this environment, Huang and Hoshi proposed a prototype fixture CAD system by wh