Computational Techniques for Mapping Design Features to Machining Features: Machining Algebra and Dimensioning and Tolerancing Mapping

9522971沙阿这个项目研究了几种计算技术，用于将产品几何数据从设计转移到制造，而不需要人工干预。该项目分为两个部分。该项目的第一个组成部分是开发用于所有加工过程的刀具-工件相互作用的几何表示的加工代数。这为确定在给定零件上产生每个加工特征的加工工艺提供了数学基础。该项目的第二个组成部分是一个计算模型，用于在保持设计意图的同时映射尺寸和公差(D&A；T)。该模型的关键元素是几何构件、有向几何约束和用于验证的自由度分析。还将开发在加工特征之间重新分配设计者D&A；T的方法。该项目解决了工业需求的一个关键领域，即设计和制造集成。缺乏这种集成会导致开发时间更长，因为今天的制造计划是一项非常劳动密集型的活动。加工代数有可能捕捉普通加工过程的基本特征，取代目前使用的浅显的启发式规则，提高制造的自动化程度。所提出的方法是通用的；它们独立于所使用的特定计算机辅助设计(CAD)或计算机辅助工艺设计(CAPP)系统。每种计算方法都可以相互独立地使用，因此将它们整合到现有的CAD/CAPP系统中是很有吸引力的。这将加强设计和制造之间的沟通，提高工艺规划生产率，从而缩短上市时间。

9522971 Shah This project investigates several computational techniques for transferring product geometry data from design to manufacturing without human intervention. The project is divided into two parts. The first component of the project is the development of machining algebra for geometric representation of tool-workpiece interaction for all machining processes. This provides the mathematical basis for determining the machining process that produces each machining feature on a given part. The second component of the project is a computational model for mapping dimensions and tolerances (D&T) while preserving the design intent. The key elements of the model are geometric building blocks, directed geometric constraints, and degree of freedom analysis for validation. Methods for redistributing the designers D&T between machining features will also be developed. This project addresses a critical area of industry need, viz., design and manufacturing integration. The lack of this integration results in longer development times because manufacturing planning today is a very labor-intensive activity. The machining algebra has the potential to capture the fundamental characteristics of common machining processes, replacing shallow heuristic rules used now, enhancing the degree to which manufacturing can be automated. The methods proposed are generic; they are independent of particular computer aided design (CAD) or computer aided process planning (CAPP) systems used. Each of the computational methods can be used independent of each other, making it attractive to incorporate them into existing CAD/CAPP systems. This will enhance the communication between design and manufacturing and enhance process planning productivity, thus reducing time to market.