面向产品研制周期的机械装配精度管理建模及其使能技术研究

本项目进行面向产品研制周期的机械装配精度管理建模及其使能技术相关基础研究。基于新一代产品几何技术规范（GPS）国际标准建立公差层次模型，实现机械产品结构与公差项目的集成；基于节点-基准链建立装配结构模型获取偏差累积路线，解决机械产品三维尺寸链建立和解析困难的问题；基于机器人位姿计算的D-H(Denavit-hartenberg，D-H)方法和旋量理论建立装配过程的位姿状态模型，综合分析尺寸和形位公差、复合公差以及受力变形等因素对装配质量的影响；采用Monte Carlo仿真进行装配精度分析和优化，建立从仿真结果到设计的反馈机制，实现产品设计及制造工艺设计的有效集成。建立一套面向产品研制周期的机械装配精度管理软件原型系统，为实现装配精度管理的数字化奠定基础。本项目从系统设计角度研究装配精度保障机制，其成果为缩短研制周期、产品质量保障、CAD/CAM技术的深化应用奠定坚实的理论和技术基础

The basic research related to the modeling and enabling technologies of tolerance management of mechnical assemblies oriented to the lead time is carried out. A tolerance level model based on the GPS is built to realize the integration between the product geometry model and tolerance items. The deviation accumulation route is obtained by establishing the model of the joint-datum chain to solve the problem that the 3D dimension chain of the mechanical product is always difficult to build and caculate. Considering the effects of geometrical tolerances，composite tolerance and force-deformation, the pose state model of assembly process is created on the basis of the robot's D-H method and the screws theory. Then Monte Carlo simulation is used in tolerance analysis and optimization, and the feedback mechanism of sensitivity analysis result is set as the bridge between design and manufacturing process. A software prototype of mechanical assembly tolerance management will be developed with independent intellectual property based on the technologies and algorithms above,which aims to contribute to the digitization of assembly tolerance management. The research of assembly tolerance management is done from the standpoint of system theory, which will lay the foundation of lead time reduction, product quality assurance and CAD/CAM further utilization.