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Basic Studies On Accuracy Management System for Shipbuilding

造船精度管理体系基础研究

基本信息

批准号：
06555303
负责人：
NOMOTO Toshiharu
金额：
$ 10.62万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

One of the most significant issues in assembly industries is accuracy management of products. Accuracy management is deeply related with product quality, manufacturing efficiency, costs and so on. Accuracy management will be more and more important in the future manufacturing systems. In this research we propose computer aided accuracy management systems based on the concept of a product model.There are two significant ways for accuracy management. One way is "accuracy planning", and the other way is "accuracy measurement". The former is accuracy management in production design stage to make production plans in the view of accuracy of products.. The latter is accuracy management in real assembling stage to evaluate accuracy of built products.For accuracy planning, it is important to estimate deformation in assembling stages. We propose models to estimate easily weld deformation of products. The concepts of equivalent stiffness and equivalent loading (that is equivalent shrinkage force and equivalent bending moment) of a welding are introduces to estimate deformation for FEM linear analysis. According to assembling procedure, deformed shapes of products are easily understood. By using them ideal shape of initial parts and an ideal shape of intermediate products in each production stage can be gotteen.For accuracy measurement we propose two types of computer models of products. Those are an ideal shaped model and a real measured shaped model. When a measurement is carried for special points on ideal shaped model, the implemented system describes these measured values in measured model. Furthermore we make clear the function for difference evaluation between two types of shaped models. The first function is setting a position. And the second function is interpretation of difference of coordinates into shape accuracy inrotmation. Differences of two shapes are evaluated by the concept of a tolerance zone inside of a computer.

装配工业中最重要的问题之一是产品的精确管理。精度管理与产品质量、制造效率、成本等密切相关。在未来的制造系统中，精度管理将变得越来越重要。在本研究中，我们提出了基于产品模型概念的计算机辅助精度管理系统。有两种重要的准确性管理方法。一种是“精度规划”，另一种是“精度测量”。前者是在生产设计阶段进行的精度管理，以产品的精度为出发点制定生产计划。后者是在实际装配阶段进行精度管理，对成品的精度进行评价。在精度规划中，对装配阶段的变形进行估计是很重要的。我们提出了易于估计产品焊接变形的模型。引入了焊接等效刚度和等效载荷（即等效收缩力和等效弯矩）的概念来估计有限元线性分析中的变形。根据装配程序，容易理解产品的变形形状。利用它们可以得到每个生产阶段初始零件的理想形状和中间产品的理想形状。为了精确测量，我们提出了两种产品的计算机模型。这是一个理想的形状模型和一个实际测量的形状模型。当对理想形状模型上的特殊点进行测量时，实现的系统在测量模型中描述这些测量值。在此基础上，明确了两类异形模型的差异评价函数。第一个功能是设置位置。第二个功能是将坐标差解释为形状精度信息。两种形状的差异是通过计算机内部的容差区来评估的。