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GB/T 24630.2-2024 English PDF

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GB/T 24630.2-2024: Geometrical product specifications(GPS) - Flatness - Part 2: Specification operators
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GB/T 24630.2: Evolution and historical versions

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GB/T 24630.2-2024English354 Add to Cart 4 days [Need to translate] Geometrical product specifications(GPS) - Flatness - Part 2: Specification operators Valid GB/T 24630.2-2024
GB/T 24630.2-2009English519 Add to Cart 3 days [Need to translate] Geometrical Product Specifications (GPS) -- Flatness -- Part 2: Specification operators Obsolete GB/T 24630.2-2009

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Basic data

Standard ID GB/T 24630.2-2024 (GB/T24630.2-2024)
Description (Translated English) Geometrical product specifications(GPS) - Flatness - Part 2: Specification operators
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J04
Classification of International Standard 17.040.20
Word Count Estimation 18,168
Date of Issue 2024-09-29
Date of Implementation 2024-09-29
Older Standard (superseded by this standard) GB/T 24630.2-2009
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 24630.2-2024: Geometrical product specifications(GPS) - Flatness - Part 2: Specification operators


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Geometrical product specifications(GPS) - Flatness - Part 2.Specification operators Product Geometry Specification (GPS) Flatness Part 2.Standard Operation Set Geometrical product specifications (GPS)-Flatness- Part 2.Specification operators (ISO 12781-2.2011, IDT) ICS 17.040.20 CCS J 04 National Standard of the People's Republic of China Replaces GB/T 24630.2-2009 Released on 2024-09-29 Implementation on September 29, 2024 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface ... Ⅲ Introduction ... Ⅳ 1 Scope ... 1 2 Normative references ... 1 3 Terms and Definitions ... 1 4 Complete Specification Operation Set ... 1 4.1 Overview ... 1 4.2 Detection System ... 2 5.Conformity with specifications ... 2 Appendix A (Informative) Harmonic components and extraction schemes for nominal plane workpieces ... 3 A.1 Harmonic components 3 A.2 Aliasing and Nyquist Criterion 3 A.3 Harmonic components of flatness elements 4 Appendix B (Informative) Extraction scheme ... 6 B.1 Overview 6 B.2 Rectangular grid extraction scheme 6 B.3 Polar Coordinate Grid Extraction Scheme 6 B.4 Specific Grid─Triangle Grid Extraction Scheme ... 7 B.5 Specific Grid - Cross-Shaped Extraction Scheme ... 7 B.6 Parallel contour extraction scheme ... 8 B.7 Multi-point extraction scheme 8 Appendix C (Informative) Relationship with GPS Matrix Model ... 9 C.1 Overview 9 C.2 Information about the standard and its use 9 C.3 Position in the GPS matrix model 9 C.4 Related standards 9 References ... 10

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting is required. This document is Part 2 of GB/T 24630 "Geometrical Technical Specification for Products (GPS) Flatness". GB/T 24630 has been published The following sections. Part 1.Vocabulary and parameters;- Part 2.Specification of Operation Sets. - This document replaces GB/T 24630.2-2009 "Product Geometric Technical Specification (GPS) Flatness Part 2.Specification Operation" Compared with GB/T 24630.2-2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows. The scope statement has been changed (see Chapter 1, Chapter 1 of the.2009 edition); a) Change "stylus tip" to "stylus tip" (see Chapter 4,.2009 edition). b) This document is equivalent to ISO 12781﹘2.2011 "Geometrical Product Specifications (GPS) Flatness Part 2.Specification Operations Collection of Works. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Product Geometry Technical Specifications (SAC/TC 240). This document was drafted by. Beijing Great Wall Metrology and Testing Technology Research Institute of China Aviation Industry Corporation, Zhongyuan University of Technology, Zhengzhou University, Shanghai Health Medical College, Shandong Industrial Technology Research Institute of Zhejiang University, Shanghai University, China Machinery Productivity Promotion Center Co., Ltd., Harbin Institute of Technology University of Science and Technology, Wenzhou Institute of Metrology, Huazhong University of Science and Technology, China University of Metrology, Suzhou Xiacheng Intelligent Technology Co., Ltd., Dongguan City Zhaofeng Precision Instrument Co., Ltd., Machinery Industry Information Research Institute, China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd. The main drafters of this document are. Sun Anbin, Zhang Xuetao, Zhao Zexiang, Guo Jiachen, Zheng Peng, Zhang Zongzheng, Li Ming, Huang Jingzhi, Wang Kexin, Zhou Jiuzhou, Lu Wenlong, Kong Ming, Zhu Yue, Wei Qingyue, Xi Min, Duan Cunli. This document was first published in.2009 and this is the first revision.

Introduction

Flatness is one of the common shape tolerances in product geometry specifications and is also one of the key indicators for evaluating product geometry accuracy. It is one of the essential technical elements in the modern production process. Flatness is the most basic item in geometric error and is very important for ensuring zero The precise positioning and matching of components plays an important role in improving the accuracy and reliability of products and optimizing the manufacturing process. Degree specifications can not only reduce errors and losses in the manufacturing process, but also significantly reduce product failure rates, extend product life, and make products With the development of digital measurement technology and product geometry specifications, the relevant definitions in the original standard are different from the current national The GPS standard is not commensurate, and the technical requirements lag behind the current production needs, and can no longer effectively regulate and guide the market production status. Standards can better regulate and guide product geometric elements, provide technical support for enterprises in the design, manufacturing, inspection and other processes, and guide my country's high The development of high-end equipment manufacturing industry. GB/T 24630 aims to specify the flatness specifications of component elements and consists of two parts. Part 1.Vocabulary and parameters. The purpose is to define the terms and concepts related to the flatness of single components. Part 2.Set of specification operations. The purpose is to define a complete set of specification operations for the flatness of a single component. This document does not specify a default filter cut-off frequency, stylus tip radius (the stylus tip itself has A certain shape and size, which plays a mechanical filtering role in the measurement, so the probe tip is sometimes also called the probe contact) and related methods (reference plane), which means that the flatness specification must specify the operating value to ensure its uniqueness. If the value is not specified, the specification is ambiguous and the supplier can use any value in this operation to provide proof of conformity. Filtering is necessary for data extraction operations, and additional filtering may or may not be used when extracting data. It can be a mean line filter (Gaussian filter, spline filter, wavelet filter, etc.) or a nonlinear filter (such as morphological filter). The filter type will affect This affects the definition of flatness as well as the set of specification operations and therefore needs to be clearly stated. NOTE 1 Stylus filtering alone is not sufficient to smooth the profile. In some cases, spurious high frequency components may be generated giving incorrect values. To correct this problem To solve this problem, long-wave channel filtering can be used. The most advanced choice is Gaussian filtering. Gaussian filtering also has some defects, such as possible distortion. Rather than eliminating certain roughness features, certain waviness features may also be distorted rather than correctly transmitted. New filter designs are being developed within ISO to Filters provide better solutions to these problems. Note 2.For a given cut-off length, if the probe tip radius is smaller than the specified value, the measured value will usually be larger. This effect can generally be ignored. If the tip radius is larger than specified, the measured value will generally be smaller. The amount of change depends very much on the surface being measured. Note 3.In order to eliminate the influence of elastic deformation of the workpiece in the standard operation set, the standard measuring force is selected as 0 N. For metal surfaces with sufficient thickness, the measurement The effect of the force can generally be ignored. NOTE 4 In the straightness direction, confusion in extraction caused by higher harmonic components of the skin model and other problems (see Annex A) may result in non-specification Certainty. This document specifies a set of standard operations for the flatness of a single component, based on the set of standard operations defined in ISO 17450﹘2. Involves specific flatness measurement methods. Product Geometry Specification (GPS) Flatness Part 2.Standard Operation Set

1 Scope

This document specifies a complete set of standard operations for the flatness of a single component. This document applies only to the complete flatness profile of a single component.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies. in this document. ISO 12781﹘1 Geometrical product specifications (GPS) Flatness Part 1.Vocabulary and parameters Note. GB/T 24630.1-2024 Product Geometric Specification (GPS) Flatness Part 1.Vocabulary and Parameters (ISO 12781﹘1.2011, MOD) ISO 14253﹘1 Geometrical Product Specifications (GPS) Measurement and inspection of workpieces and measuring equipment Part 1.Verification to specifications Rules for judging whether a product is qualified or not [Geometrical product specifications (GPS)-Inspection by measurement of workpieces and measuring equipment-Part 1.Decision rules for verifying conformity or nonconformity with specifications] Note. GB/T 18779.1-2022 Technical Specification for Product Geometry (GPS) Measurement and Inspection of Workpieces and Measuring Equipment Part 1.Verification of Conformity to Specifications Rules for determining whether a product is qualified or unqualified (ISO 14253﹘1.2017, IDT) ISO 17450﹘2 Geometrical product specifications (GPS) General concepts Part 2.Basic principles, specifications, operational sets and non- Degree of certainty [Geometrical product specifications (GPS)-General concepts-Part 2.Basic tenets, specifica﹘ tions, operators, uncertainties and ambiguities] Note. GB/T 24637.2-2020 Technical Specification for Product Geometry (GPS) General Concepts Part 2.Basic Principles, Specifications, Operation Sets and Uncertainties Determination (ISO 17450﹘2.2012, MOD)

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in ISO 12781﹘1 and ISO 17450﹘2 apply.

4 Complete set of standard operations

4.1 Overview A complete set of specification operations (see ISO 17450﹘2) is an ordered set of operations consisting of well-defined, complete specification operations. The complete set of specification operations for flatness defines the bandwidth of the flatness surface, given a suitable stylus tip geometry. Note. In practice, it is unrealistic to achieve complete coverage of the planarity elements given by the theoretical minimum point density within an acceptable time frame using existing technology. Therefore, a more restrictive extraction scheme is adopted, giving specific information related to planar shape deviations rather than general information.

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