proe分析“公差研究”论文.doc

摘 要 机械产品的质量指标（精度、耐用度、可靠性）在很大程度上决定于公差选择的合理性。公差也直接影响着产品的可制造性和可装配性，对产品的功能、制造成本也有重要影响。依据产品整体或零部件的技术要求、加工方案等对有关零部件进行合理的公差分配能够在产品的功能与制造成本之间的找到一个平衡，其研究工具是尺寸链即装配尺寸链里、零件尺寸链、和工艺尺寸链等。 任何机械产品都是由零件装配而成的,产品精度的高低和性能优劣很大程度上是由零件的制造精度决定的, 其中零件制造精度的高低是由其加工中允许的设计公差确定的,而产品精度和性能的要求也反过来为零件的制造精度的选择提供了依据。 本文以PRO/E作为设计平台，通过PRO/E建模工具设计零件并进行装配，同时运用PRO/E中的CE/TOL（公差分析）模块对所设计的零件及零件装配的全过程进行公差分析与综合，确定零件的公差在装配过程中影响关键尺寸公差的约束及其敏感度，通过改变个别零件的关键尺寸的公差约束即公差的优化过程，来降低制造成本，减少发生干涉和精度超标的概率，提高产品的精度。 关键词：公差分配；尺寸链；计算机辅助公差设计（CAT）；公差优化 Abstract Quality indicators (precision, durability, reliability) of the mechanical products in a large extent are determined by their tolerance to be selected reasonably. Tolerance is one of the factors impacting on the manufacturability and assembly of products. It also has a major impact on manufacturing costs and the products features. According to the technical requirements and the processing program of the workpieces and parts, tolerances are allocated reasonably to the parts and components to getting the balance between the products features and manufacturing costs. The research tool is dimension chain, that is, assembly dimension chain, size chain, and process geometries chains, etc. Any mechanical products are assembled by parts. Product accuracy and performance are largely determined by the manufacturing precision of the parts, which parts manufacturing accuracy is arrived by the design tolerances allowed by the processing. In turn accuracy and performance requirements provide a basis for choice of manufacturing precision of parts. In this paper, based on Pro/E software, parts are designed and assembled by using Pro/E modeling tools. while the use of CE/TOL (tolerance analysis) module of Pro/E on the whole process of the parts and assembly of components designed for tolerance analysis and synthesis determine the tolerances of the parts in the assembly process affect the constraints and sensitivity of the critical dimension tolerances, and optimization process by changing th