• 作者： 蔡志成；莊燦肇；郭德寧
• 中文摘要： STEP (STandard for the Exchange of Product model data) is an effort by the International Organization for Standardization (ISO) to develop an international standard for product modeling required for industrial automation. The product model involves both generic working standards and information models. As product accuracy becomes tighter, dimensioning and tolerancing (D&T) information also plays an important role in the product lifecycle. It is, therefore, important to develop a D&T data model based on STEP. This paper investigates the information required to build a STEP-based D&T schema and describes the development and implementation of such a D&T data model. It is found that the ISO draft model is not capable of representing the mating relationship be tween parts; hence, additional entities to model this relationship are suggested. Construction of a product D&T specifications based on the developed model is then described. Two examples, including a single part with an interface for constructing the corresponding tolerance network and an assembled product with D&T and mating specifications, are given to illustrate how the developed data model can be used in engineering practice.
• 英文摘要： --
• 中文關鍵字： STEP, product model, dimensioning and tolerancing, data model, ISO 10303
• 英文關鍵字： --