GB/T 17421.2-2023 English PDFUS$804.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 17421.2-2023: Test code for machine tools - Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes Status: Valid GB/T 17421.2: Historical versions
Basic dataStandard ID: GB/T 17421.2-2023 (GB/T17421.2-2023)Description (Translated English): Test code for machine tools - Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J50 Classification of International Standard: 25.040.20 Word Count Estimation: 46,497 Date of Issue: 2023-08-06 Date of Implementation: 2024-03-01 Older Standard (superseded by this standard): GB/T 17421.2-2016 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 17421.2-2023: Test code for machine tools - Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes---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. ICS 25.040.20 CCSJ50 National Standards of People's Republic of China Replace GB/T 17421.2-2016 General Inspection of Machine Tools Part 2.CNC Axis Determination of positioning accuracy and repeat positioning accuracy (ISO 230-2.2014,IDT) Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee Table of contentsPreface III Introduction V 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 4 Inspection conditions 5 4.1 Environment 5 4.2 Machine tool under inspection 6 4.3 Temperature rise 6 5 Inspection Procedure 6 5.1 Operation method 6 5.2 Selection of target location 6 5.3 Measurement 7 6 Evaluation of results 8 6.1 Linear axes with strokes up to.2000 mm and rotary axes with strokes up to 360°8 6.2 Linear axes with a stroke exceeding.2000mm and rotary axes with a stroke exceeding 360°8 7 Points for negotiation between manufacturer/supplier and user9 8 Expression of results 9 8.1 Expression method 9 8.2 Parameter 10 Appendix A (informative) Simple method for estimating measurement uncertainty of linear positioning measurements 17 A.1 Estimation of extended measurement uncertainty17 A.2 Contributing factors to measurement uncertainty17 A.3 Estimation of expanded uncertainty of parameters A, A↑, A↓, E, E↑, E↓, R, R↑, R↓, B 22 A.4 Examples of estimating expanded uncertainty24 Appendix B (informative) Ladder cycle 30 Appendix C (informative) Periodic positioning error 31 C.1 General 31 C.2 Periodic positioning error with known period interval31 Appendix D (informative) Linear positioning error measurement using standard ball array or step gauge 33 D.1 General 33 D.2 Measurements with ball array and linear displacement multi-sensor devices34 D.3 Measurement with ball array or step gauge and contact trigger probe 34 Appendix E (informative) Minimum incremental step size 35 E.1 General 35 E.2 Inspection conditions 35 Reference 37ForewordThis document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is Part 2 of GB/T 17421 "General Principles for Machine Tool Inspection". GB/T 17421 has published the following parts. ---Part 1.Geometric accuracy of machine tools under no-load or quasi-static conditions; ---Part 2.Determination of positioning accuracy and repeatability accuracy of CNC axes; ---Part 3.Determination of thermal effects; ---Part 4.Circle inspection of CNC machine tools; ---Part 5.Determination of noise emission; ---Part 6.Determination of body and surface diagonal position accuracy (diagonal displacement test); ---Part 7.Geometric accuracy of the axis of rotation; ---Part 10.Determination of measurement performance of CNC machine tool detection systems. This document replaces GB/T 17421.2-2016 "General Principles for Machine Tool Inspection Part 2.Positioning Accuracy and Repeatable Positioning Accuracy of CNC Axis "Determination of Degree". Compared with GB/T 17421.2-2016, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Added a chapter of "Normative Reference Documents" (see Chapter 2); b) The chapter "Definitions and Symbols" is modified to "Terms and Definitions", and "3.3 Point of Action", "3.9 Standard Uncertainty" and "3.10 Synthesis" are added Terms and definitions such as "standard uncertainty" and "3.28 sampling point" (see Chapter 3, Chapter 2 of the.2016 edition); c) The definitions of "actual position" and "position deviation" have been changed, and the "moving part" in the definition has been changed to "action point" (see 3.5, 3.6, 2.4, 2.5 of the.2016 version); d) The term names include “positioning deviation”, “reverse error at a certain position”, “axis reversal error”, “axis average reversal error” and “axis reversal error”. Line one-way positioning error" "Axis two-way positioning error" (see 3.6, 3.15, 3.16, 3.17, 3.26, 3.27,.2016 edition 2.5, 2.12, 2.13, 2.14, 2.23, 2.24); e) Replace the terms "axis one-way positioning deviation", "axis two-way positioning deviation" and "axis two-way average positioning deviation" respectively Change to "axis one-way positioning system error" "axis two-way positioning system error" "axis two-way average fixed system error" (see 3.23, 3.24, 3.25, 2.20, 2.21, 2.22 of the.2016 version); f) The relevant provisions on feed speed in the operating methods have been changed (see 5.1, 4.1 of the.2016 edition); g) Changed the relevant description of "r" in the selection of the target position of the inspection program, and added the requirements for selecting the target position during re-inspection or acceptance. Seek (see 5.2, 4.2 of the.2016 version); h) Several examples of devices and instruments for measuring linear axes and rotary axes have been added, and the location of instruments and inspection tools has been clearly stated in the inspection report. Relevant requirements for installation (see 5.3.1); i) Delete the requirement "for special cases (such as heavy machine tools) according to Appendix B" in the inspection of linear axes with a stroke of.2000mm (see 2016 version 4.3.2); j) Added inspection when the axis stroke exceeds 4000mm (see 5.3.3); k) Changed the negotiation points and added “minimum and maximum ambient temperatures” (see Chapter 7, Chapter 6 of the.2016 edition); l) The items that should be listed on the inspection report have been changed (see 8.1, 7.1 of the.2016 version); m) Added “Explanation of relevant terms regarding axis positioning error elements” (see 8.2.4); n) Change “Estimation of Measurement Uncertainty” to “Estimation of Extended Measurement Uncertainty” and refine the estimation method (see A.1, 2016 version of A.1); o) Changed the expression form of the possible error range of temperature measurement, such as 0.7℃ expressed as ±0.35℃, and changed the measurement device Explanation of expansion coefficient α (see A.2.4.2,.2016 version of A.2.4.2); p) Change "drift test" to "environmental change error test" (see A.2.5,.2016 version of A.2.5). This document is equivalent to ISO 230-2.2014 "General Principles for Machine Tool Inspection Part 2.Positioning accuracy and repeatability accuracy of CNC axes" "Determined". This document has made the following minimal editorial changes. ---Added descriptive information of informative Appendix E to Chapter 1 "Scope"; ---Incorporated the amendments to ISO 230-2.2014/Amd.1.2016(E); --- Move the normative reference document ISO 230-3.2007 into the reference document, and add ISO 230-10 to the reference document. Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Metal Cutting Machine Tool Standardization Technical Committee (SAC/TC22). This document was drafted by. General Technology Group Machine Tool Engineering Research Institute Co., Ltd., Shanghai Machine Tool Factory Co., Ltd., Wuhan Heavy Machine Tool Group Tuan Co., Ltd., Chongqing Machine Tool (Group) Co., Ltd., Shenyang Machinery Group Kunming Machine Tool Co., Ltd., Shenyang Machine Tool (Group) Co., Ltd. Ren Company, Jiangsu High Precision Mechanical and Electrical Equipment Co., Ltd., Sichuan Pushningjiang Machine Tool Co., Ltd., Qinchuan Machine Tool Group Co., Ltd., Yantai Environmental Protection Equipment Co., Ltd. Ball Machine Tool Equipment Co., Ltd., Qizhong CNC Equipment Co., Ltd., Guangdong Kejie Technology Co., Ltd., Hangzhou Huile Intelligent Technology Co., Ltd. Technology Co., Ltd., Jinan Zhangli Machinery Co., Ltd., Zhejiang Yiyang Intelligent Equipment Technology Co., Ltd., Zhejiang Yonglida CNC Technology Co., Ltd. Co., Ltd., Shenzhen Lanlan Technology Co., Ltd., Anhui Xinnuo Precision Co., Ltd., and Beijing Guangyu Dacheng CNC Machine Tool Co., Ltd. The main drafters of this document. Zhang Wei, Huang Zuguang, Yu Chunping, Chen Yanyan, Xue Ruijuan, Zhao Qinzhi, Lu Hua, Xu Haoli, Yu Kebin, He Chunshu, Tan Zhi, Liu Zhengdong, Yang Chengbing, Wen Xiaoni, Li Jun, Wang Jing, Li Shulin, Zhang Yuedong, Nie Yingxin, Hu Wei, Li Tao, Lu Yanhui, Sun Qinghai, Tang Anwei, Zheng Yong, Wang Wentao, Li Qin, Yu Qijun. The previous versions of this document and the documents it replaces are as follows. ---First published as GB/T 10931-1989 in 1989; ---The first revision was GB/T 17421.2-2000 in.2000; the second revision was in.2016, and this is the third revision.IntroductionGB/T 17421 "General Principles for Machine Tool Inspection" is a general standard for machine tool inspection and establishes the principles and requirements for machine tool accuracy and performance inspection. GB/T 17421 is intended to consist of the following parts. ---Part 1.Geometric accuracy of machine tools under no-load or quasi-static conditions. The purpose is to standardize the operation of machine tools without load or quasi-static Testing method for geometric accuracy and working accuracy under certain conditions. ---Part 2.Determination of positioning accuracy and repeatability accuracy of CNC axes. The purpose is to standardize the inspection and evaluation of CNC machine tools Axis positioning accuracy and repeatable positioning accuracy. ---Part 3.Determination of thermal effects. The purpose is to standardize the inspection methods for machine tool ambient temperature, spindle and linear axis thermal deformation. ---Part 4.Circle inspection of CNC machine tools. The purpose is to standardize the inspection and evaluation methods of the contour characteristics of CNC machine tools. ---Part 5.Determination of noise emissions. The purpose is to standardize the noise testing methods of machine tools and related auxiliary devices. ---Part 6.Determination of body and surface diagonal position accuracy (diagonal displacement test). The purpose is to standardize the spatial accuracy of machine tools Testing method. ---Part 7.Geometric accuracy of the axis of rotation. The purpose is to standardize the inspection method for the geometric accuracy of the rotation axis of machine tools. ---Part 8.Vibration. The purpose is to provide a general procedure for machine tool vibration assessment. ---Part 9.Basic equations for uncertainty estimation of the ISO 230 machine tool inspection series standards. The purpose is to provide machine tool inspection Methods for evaluating measurement uncertainty. ---Part 10.Determination of measurement performance of CNC machine tool detection systems. The purpose is to standardize the inspection and evaluation of CNC machine tool detection systems performance approach. ---Part 11.Measuring instruments for geometric accuracy inspection of machine tools. The purpose is to provide machine tool geometric accuracy inspection and measuring instrument characteristics. information. ---Part 12.Finishing test pieces. The purpose is to standardize the evaluation of the characteristics of finishing test pieces of various types of machine tools. This document is Part 2 of GB/T 17421.It mainly specifies the inspection and evaluation of the positioning accuracy and repeatable positioning of CNC machine tool axes. The accuracy method also provides a method for estimating measurement uncertainty, which can be used to inspect the positioning accuracy and repeated positioning accuracy of various machine tool products. basis and guidance. This document involves inspection procedures for the positioning accuracy and repeatability accuracy of CNC axes. This inspection is used to measure the tool clamping of the machine tool. The relative movement between the component and the component holding the workpiece. The machine tool manufacturer/supplier is responsible for providing the ambient temperature conditions required for the machine tool to operate with specified accuracy, and the user is responsible for providing it at the installation site. The test temperature environment required by the manufacturer/supplier, otherwise you will have to accept the reduction in machine tool performance. Appendix C of ISO 230-3.2007 gives Guidelines for machine tool ambient temperatures. If the ambient temperature does not meet the ambient temperature guidelines provided by the manufacturer/supplier and causes large uncertainty or changes in machine tool performance, ation, the expected accuracy needs to be relaxed. If the machine tool does not meet the performance specifications, analyze the uncertainty caused by the machine tool accuracy compensation (see this document A.2.4) and the uncertainty caused by environmental change errors (see A.2.5 of this document) can help identify the source of the problem. General Inspection of Machine Tools Part 2.CNC Axis Determination of positioning accuracy and repeat positioning accuracy1 ScopeThis document specifies the inspection and evaluation of the positioning accuracy and repeatability accuracy of CNC machine tool axes by directly measuring a single axis of the machine tool. degree method. This method works equally well for linear and rotary axes (linear and rotary motion). This document is applicable to type inspection, acceptance inspection, comparative inspection, periodic inspection of machine tools, and can also be used for compensation adjustment inspection of machine tools. This document does not apply to machine tools that require simultaneous inspection of several axes. The inspection method involves repeated measurements at each location. This document gives the definitions and calculation methods of parameters relevant to the inspection. The uncertainty estimation method is described in Appendix C of ISO /T R230-9.2005. Appendix A provides methods for estimating measurement uncertainty. Appendix B describes alternative ladder cycles for alternative applications. The results of this cycle are neither used in the technical literature relevant to this document. and shall not be used for acceptance unless there is a special written agreement between the manufacturer/supplier and the machine tool user. For the purpose of machine tool acceptance Considering this, using the standard inspection cycles of this document is always the right choice. Appendix C gives relevant content about periodic positioning errors. Appendix D describes inspection using standard ball arrays and step gauges. Appendix E provides relevant information on the minimum incremental step size.2 Normative reference documentsThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. GB/T 17421.1-2023 General principles for inspection of machine tools Part 1.Geometric accuracy of machine tools under no-load or quasi-static conditions (ISO 230-1.2012,IDT) ISO /T R230-9.2005 General Principles for Machine Tool Inspection Part 9.Basis for Uncertainty Estimation of the ISO 230 Machine Tool Inspection Series Standards3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 axis travelaxistravel The maximum linear stroke of the moving part moving along the axis or the maximum rotation around the axis under digital control. Note. When the moving part rotates more than 360° about its axis, the maximum stroke may not be clearly defined. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 17421.2-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 17421.2-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 17421.2-2023?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 17421.2-2023 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
