Modeling of Part-Fixture Dynamics With Application to Synthesis of Dedicated and Flexible Fixturing Systems

该补助金提供资金用于开发用于分析加工中零件夹具动力学的模型，并将这些模型应用于专用和灵活夹具系统的合成。 在这项研究中开发的模型将使零件夹具的相互作用被认为是在多点加工过程，如铣削的稳定性分析。 此外，该模型将允许零件夹具动力学对最终零件质量的影响进行分析，并在专用和灵活的夹具系统的合成占。为了实现这一目标，将开发一个动态模型的零件夹具系统占微滑移引起的阻尼的影响。 基于接触弹性原理的简化集总参数方法将用于建立模型。 该模型将考虑单边接触条件、微滑动和总粘滑引起的非线性。 此外，还将使用一个改进的动态摩擦测试仪来开发与动态模型一起使用的零件-夹具接触摩擦的经验模型。 零件-夹具动态模型可应用于专用夹具和柔性加工夹具的分析与综合，如针列式柔性夹具。 从根本上讲，本研究中开发的模型将补充现有的部分夹具科学知识。 在实践层面上，它将提供必要的动态分析和合成工具，迄今为止，专用和灵活的夹具系统的设计者和最终用户。 这些模型的应用将导致真正的过程能力的夹具的开发和实施。

This grant provides funding for the development of models for analysis of part-fixture dynamics in machining and application of these models to the synthesis of dedicated and flexible fixturing systems. The models developed in this research will enable part-fixture interaction to be considered in the stability analysis of multiple-point machining processes such as milling. In addition, the models will allow the impact of part-fixture dynamics on the final part quality to be analyzed and accounted for in the synthesis of both dedicated and flexible fixturing systems.To achieve this goal, a dynamic model of the part-fixture system accounting for the effects of micro-slip induced damping will be developed. A simplified lumped parameter approach based on contact elasticity principles will be used to develop the model. The model will account for nonlinearities arising from unilateral contact conditions, micro-slip and gross stick-slip. In addition, a modified dynamic friction tester will be used to develop empirical models of part-fixture contact friction for use with the dynamic model. The dynamic part-fixture model will be applied to the analysis and synthesis of both dedicated and flexible machining fixtures such as the pin-array flexible fixture. On a fundamental level, the models developed in this research will complement the existing body of scientific knowledge in part fixturing. On a practical level, it will provide the necessary dynamic analysis and synthesis tools, heretofore unavailable, for designers and end-users of dedicated and flexible fixturing systems. Application of these models will lead to the development and implementation of truly process-capable fixtures.