Overview
ISO 18183-2:2024 is an International Standard developed by the International Organization for Standardization (ISO) that specifies the methods used to partition a nominal model within the framework of Geometrical Product Specifications (GPS). As Part 2 of the ISO 18183 series on Partition, this document focuses on defining and formalizing operations such as selection, simplification, and subdivision applied to nominal models used in solid and geometrical modeling, including CAD systems.
This standard supports the efficient generation, interpretation, and verification of geometrical models by providing clear rules for partitioning a nominal model into features. It plays a crucial role in the digital manufacturing ecosystem, especially for autonomous production systems, by enabling smart identification and recording of nominal model features without the need for human intervention.
Key Topics
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Nominal Model Partitioning
ISO 18183-2 defines procedures for dividing a nominal geometrical product model into distinct partitioned features. These features can be derived from surfaces, edges, vertices, and blend edges of 3D models.
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Operations: Selection, Simplification, Subdivision
The standard formalizes three main operations:
- Selection: Choosing relevant features or areas of the model.
- Simplification: Combining multiple features into simplified, unified entities.
- Subdivision: Breaking down features into more detailed sub-features, such as datum targets or restricted areas.
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Default Nominal Partition
Unless otherwise specified, the nominal model is partitioned by default into single surfaces as the initial set of partitioned features, following the geometrical element rules from ISO 8015.
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Relationship with ISO GPS Matrix Model
This standard is part of the general GPS standards influencing multiple chain links in the ISO GPS matrix, including feature specifications, conformity, and measurement. It supports consistent application alongside other GPS standards such as ISO 1101 (geometrical tolerancing), ISO 5459 (datums), and ISO 14253-1 (decision rules for conformity).
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Applications in CAD and Manufacturing
By defining systematic nominal partitioning methods, the standard enhances the interoperability of CAD data with verification and inspection processes while supporting smart manufacturing and automated quality control.
Applications
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Geometrical Product Specification (GPS) Implementation
Enables precise and standardized partitioning of nominal models, essential for defining tolerances, datums, and measurement zones in product design and verification.
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Computer-Aided Design (CAD) Systems
Facilitates the automated generation and annotation of geometrical features, improving clarity and reducing errors in design documentation.
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Smart Manufacturing and Inspection
Supports automated interpretation of nominal models within autonomous production lines, permitting software systems to identify toleranced regions and verification features without manual input.
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Quality Assurance and Verification
Assists in creating clear, partitioned feature sets that can be directly used for inspection planning and conformity assessment according to established ISO GPS decision rules.
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Standardization Across Industries
Applies to sectors requiring precise geometrical specifications such as aerospace, automotive, machinery, and precision engineering, enabling consistent communication of product geometry.
Related Standards
ISO 18183-2:2024 works in conjunction with other key standards to ensure comprehensive geometrical product specification management:
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ISO 18183-1: Vocabulary and Basic Concepts
Defines fundamental terminology and concepts related to partitioning models.
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ISO 18183-3: Methods for Specification and Verification
Details procedures on how to specify and verify partitioned features in the nominal model.
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ISO 1101:2017: Geometrical Tolerancing
Establishes tolerances of form, orientation, location, and run-out essential for GPS.
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ISO 5459:2011: Datums and Datum Systems
Specifies datum features and systems relevant for positioning within the nominal model.
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ISO 8015: Fundamentals of GPS
Provides fundamental principles and rules that underpin partitioning and geometrical element definitions.
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ISO 14253-1: Inspection and Decision Rules
Contains decision rules for verifying conformity of products against specifications.
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ISO 14638: GPS Matrix Model
Offers an overview and system framework for the ISO GPS standards ecosystem.
By aligning with these related standards, ISO 18183-2:2024 ensures integrated and consistent application of geometrical product specifications throughout design, manufacturing, and quality control processes.
ISO 18183-2:2024 streamlines nominal model partitioning to enhance clarity, automation, and precision in geometrical product specification. Its adoption supports modern manufacturing demands for interoperable and intelligent geometrical modeling, increasing efficiency and reducing ambiguity in product definition and verification.