Def@ShapeCAT: Consideration of part deformations in shape-aware computer-aided tolerancing

Def@ShapeCAT：形状感知计算机辅助公差中零件变形的考虑

• 批准号: 469126611
• 负责人: Professor Dr.-Ing. Benjamin Schleich
• 金额: --
• 依托单位: Fachgebiet Product Life Cycle Management
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/469126611?language=en
• 关键词: Def; ShapeCAT; Consideration; part; deformations

As a consequence of inevitable manufacturing imprecisions, geometrical deviations are observed on every manufactured part. Tolerance analysis provides a quantitative tool that enables the assessment of the effects of these geometrical part deviations on the function of mechanical assemblies. It is widely used in design to support the functional specification of tolerances, but also in the pre-production and production stages to support process planning activities, the tolerance verification, the root cause analysis, and the manufacturing and assembly process optimization. Due to this importance, various tolerance analysis theories and methods have been proposed in scientific literature within the last decades. However, they all share severe intrinsic limitations. As a response to this, a comprehensive framework for the shape-aware tolerance analysis based on Skin Model Shapes has been developed recently, which overcomes important weaknesses of established tolerance analysis approaches, such as the lacking conformance to international tolerancing standards and the missing consideration of form deviations. However, up to now, this existing tolerance analysis framework is limited to the assessment of the effects of geometrical deviations on rigid parts, while it is acknowledged, that these deviations add up with further deviations caused by physical phenomena, such as thermal expansion and part deformations. To overcome this shortcoming, this project aims at elaborating new approaches and methods for the consideration of part deformations in the tolerance analysis based on Skin Model Shapes. Particularly, new methods for the consideration of structural and local part deformations and their interrelationships with geometrical part deviations in the tolerance analysis will be explored. The elaborated procedures and algorithms will also be implemented in a prototype application for the tolerance analysis based on Skin Model Shapes to demonstrate the applicability of the developed methods. In summary, the planned project will hence strongly contribute to the growing demand for more sophisticated computer-aided tolerancing tools and considerably broaden the scientific body of knowledge regarding tolerancing theories.

由于不可避免的制造不精确性，在每个制造零件上都观察到几何偏差。公差分析提供了一种定量工具，可以评估这些几何零件偏差对机械组件功能的影响。它广泛应用于设计中以支持公差的功能规范，而且还用于预生产和生产阶段以支持工艺规划活动，公差验证，根本原因分析以及制造和装配过程优化。由于这一重要性，在过去的几十年里，各种公差分析理论和方法已在科学文献中提出。然而，它们都有严重的内在局限性。针对这一问题，提出了一种基于蒙皮模型的形状感知公差分析框架，克服了现有公差分析方法的重要缺陷，如缺乏与国际公差标准的一致性和缺少对形状偏差的考虑。然而，到目前为止，这种现有的公差分析框架仅限于评估刚性零件上的几何偏差的影响，而公认的是，这些偏差加上由物理现象引起的进一步偏差，例如热膨胀和零件变形。为了克服这一缺点，本项目旨在阐述基于蒙皮模型的公差分析中考虑零件变形的新途径和方法。特别是，新的方法考虑结构和局部零件变形及其相互关系与几何零件偏差的公差分析将进行探索。详细的程序和算法也将在一个原型应用程序中实现的容差分析的基础上皮肤模型建模，以证明所开发的方法的适用性。总之，计划中的项目将大大有助于更复杂的计算机辅助公差工具的需求不断增长，并大大拓宽了有关公差理论的科学知识体系。