GB/T 18784.2-2005

📋 Scope / 适用范围 ai_extracted

··························, ························, ··························································⋯⋯ 1

📝 Foreword / 前言 ai_extracted

GB/T 18784.2-2005 The main technical content of this part of GB/T 18784 refers to the technical document ODG11CQ9504 published by the Organization for Data Exchange by Tele Transmission in Europe (ODETTE). Only partial editorial adjustments have been made to the technical content, and the formatting complies with the provisions of GB/T 1.1-2000. Annexes A, B, and C of this part are informative annexes. This part is proposed and centralized by the China National Institute of Standardization. This part is drafted by the China National Institute of Standardization. Main drafters of this part: Zhan Junfeng, Wang Ping. GB/T 18784.2-2005 Introduction With the development and popularization of information technology in the manufacturing industry, manufacturers and suppliers have widely adopted CAD/CAM systems for product development processes. When using these information systems, traditional drawings and physical models are no longer sufficient. Three-dimensional CAD digital models, such as product models including surfaces and solid features, have become essential means of information expression in advanced manufacturing technology. To achieve information sharing and model data exchange among various CAD/CAM systems, it is required to reach a common understanding and agreement on the quality level of model information during the exchange of CAD/CAM model data, and to stipulate reliable quality assurance methods. Data quality in this part refers to a measure of the accuracy and suitability of data, which should be provided to the parties requiring the data in a timely manner. The content of this standard is primarily intended to meet the quality assurance requirements for CAD/CAM geometric data. This part describes general methods for CAD/CAM data quality assurance during the data exchange process. The technical content of this part is related to the content of GB/T 18784-2002 "CAD/CAM Data Quality Standard" and can be used in conjunction with it. Users of this part include personnel responsible for CAD/CAM data quality in enterprises, CAD/CAM software developers, quality assurance software developers, and other end users of CAD/CAM software systems. GB/T 18784.2-2005 CAD/CAM Data Quality Assurance Methods 1 Scope This part of GB/T 18784 describes the general requirements for CAD/CAM data quality assurance methods. This part is applicable to ensuring the quality of CAD/CAM data exchange within and between enterprises, and serves as a quality assurance basis for CAD/CAM software or CAD/CAM data quality inspection software. 2 Normative References The following documents contain provisions which, through reference in this part of GB/T 18784, constitute provisions of this part. For dated references, subsequent amendments (excluding corrigenda) or revisions to any of these publications do not apply to this part. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. For undated references, the latest edition of the document referred to applies. GB/T 19001-2000 Quality Management Systems - Requirements (idt ISO 9001:2000) GB/T 18784-2002 CAD/CAM Data Quality 3 Terms and Definitions The following terms and definitions apply to this standard. 3.1 Boundary A set of mathematical points s in a domain X contained in Rⁿ space, such that there exists an open ball U in Rⁿ containing s, where the intersection U ∩ X is homeomorphic to an open set in a closed d-dimensional half-space R⁺ᵈ (for d less than or equal to n), with this homeomorphism mapping X to the origin in Rⁿ. Note 1: R⁺ᵈ is defined as the set of all mathematical points (x₁, x₂, ..., xₙ) in Rᵈ with x₁ ≥ 0. Note 2: Here, "open" has its usual mathematical meaning and is unrelated to the "open surface" defined elsewhere in this standard. [GB/T 16656.42-1998, Definition 3.1.4] 3.2 Curve A set of mathematical points that is the image of a continuous function defined on a connected subset of the real line (R¹) in 2-dimensional or 3-dimensional space, but not a single point. [GB/T 16656.42-1998, Definition 3.1.13] 3.3 Overlap Two entities are said to overlap when they share a common shell, face, edge, or vertex. [GB/T 16656.42-1998, Definition 3.1.36] 3.4 Self-intersect A curve or surface is self-intersecting if a mathematical point in its domain is the image of at least two points within the parameter range of the object, and one of these points lies inside the parameter range. The same definition applies to vertices, edges, or faces. Note: If a curve or surface is closed, it is not considered

📚 References & Relations / 引用与关联

🔗 Related Standards / 同类标准