GB/T 34880.2-2025 English PDFGB/T 34880.2: Historical versions
Basic dataStandard ID: GB/T 34880.2-2025 (GB/T34880.2-2025)Description (Translated English): Test conditions for 5-axis simultaneous machining centers - Part 2: Testing of the accuracy for vertical machine Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J54 Classification of International Standard: 25.040.10 Word Count Estimation: 118,189 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 34880.2-2017 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 34880.2-2025: Test conditions for 5-axis simultaneous machining centers - Part 2: Testing of the accuracy for vertical machine---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34880.2-2025 ICS 25.040.10 CCSJ54 National Standard of the People's Republic of China Replaces GB/T 34880.2-2017 Five-axis machining center inspection conditions Part 2.Accuracy testing of vertical machine tools Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General 1 4.1 Units of measurement 1 4.2 Implementation Standard 2 4.3 Inspection sequence 2 4.4 Inspection Item 2 4.5 Inspection Tools 2 4.6 Tool Center Point Following Function (RTCP) Accuracy Test 2 4.7 Type of test piece 2 4.8 Working accuracy inspection 3 4.9 Software Compensation 3 4.10 Position of non-test axis 3 4.11 Simplified Figure 3 4.12 Pallet 3 4.13 Inspection Environmental Conditions 3 4.14 Machine tool structure and motion axis naming 3 4.15 Mark 4 4.16 Minimum tolerance 4 5 Geometric accuracy inspection 6 5.1 Straightness Error of Linear Axis Motion 6 5.2 Angular Error in Linear Axis Motion 9 5.3 Perpendicularity Error Between Two Linear Axis Motions 12 5.4 Spindle Error 15 5.5 Flatness error of work table or pallet 20 6 Positioning accuracy and repeatability test of CNC axis 21 6.1 Positioning Accuracy and Repeatability of Linear Axis 21 6.2 Positioning accuracy and repeatability of the rotary axis 23 7 Working accuracy inspection 24 Appendix A (Normative) Additional Geometric Accuracy Test for AC Swing Rotary Table Machine Tools 40 Appendix B (Normative) Additional Geometric Accuracy Test for BC Swinging Rotary Table Machine Tools 69 Appendix C (Normative) Additional Geometric Accuracy Test for Swinging Spindle Head Machine Tools 96 Appendix D (Normative) Additional Geometric Accuracy Test for Rotary Swinging Spindle Head Machine Tools 103 Figure 1 Typical structure of five-axis linkage vertical machining center Figure 5 Figure 2 Specimen M1-80 (P grade) 24 Figure 3 Specimen M1-160 (P grade) 25 Figure 4 Specimen M1-320 (P grade) 26 Figure 5 Specimen M1-80 blank 27 Figure 6 Specimen M1-160 blank 27 Figure 7 Specimen M1-320 blank 28 Figure 8 Specimen M3 installation 32 Figure 9 Specimen M3 (P grade) 32 Figure 10 Specimen M4-80 (P grade) 34 Figure 11 Specimen M4-160 (P grade) 35 Figure 12 Specimen M4-320 (P grade) 35 Figure 13 Test piece M4 blank 36 Table 1 Type of test piece 2 Preface 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. This document is part 2 of GB/T 34880 "Test conditions for five-axis machining centers". GB/T 34880 has published the following part. --- Part 1.Accuracy inspection of horizontal machine tools; --- Part 2.Vertical machine tool accuracy inspection; --- Part 3.Technical conditions. This document replaces GB/T 34880.2-2017 "Test conditions for five-axis machining centers Part 2.Precision test conditions for vertical machine tools" Compared with GB/T 34880.2-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The requirements of the implementation standard have been changed (see 4.2, 4.2 of the.2017 edition); b) Changed the requirements for inspection tools (see 4.5, 4.5 of the.2017 edition); c) Added the requirements for tool center point following function (RTCP) accuracy inspection (see 4.6); d) The requirements for the type of test piece have been changed (see 4.7, 4.6 of the 2027 edition); e) Changed the requirements for software compensation (see 4.9, 4.10 of the.2017 edition); f) Added the position of non-test axis (see 4.10); g) Changed the requirements for schematic drawings (see 4.11, 4.8 of the.2017 edition); h) Changed the requirements for pallets (see 4.12, 4.9 of the.2017 edition); i) Added requirements for inspection environmental conditions (see 4.13); j) The minimum tolerance requirements have been changed (see 4.16, 4.13 of the.2017 edition); k) Changed the straightness error inspection requirements for X-axis, Y-axis and Z-axis motion (see G1 to G3 in 5.1,.2017 edition). G1~G3); l) Changed the angular error inspection requirements for X-axis, Y-axis and Z-axis motion (see G4~G6 in 5.2,.2017 edition). G4~G6); m) Changed the relationship between Z axis movement and X axis movement, Z axis movement and Y axis movement, Y axis movement and X axis movement Verticality error inspection requirements between (see G7 to G9 in 5.3, G7 to G9 in the.2017 edition); n) Changed the spindle's axial error motion, the spindle taper's radial error motion, and the parallelism between the spindle axis and the Z axis motion Error, perpendicularity error between spindle axis and X axis movement, perpendicularity error between spindle axis and Y axis movement Requirements (see G10~G14 in 5.4, G10~G14 in the.2017 edition); o) Changed the flatness error inspection requirements for the worktable (see G15 in 5.5, G15 in the.2017 edition); p) Deleted the parallelism between the worktable and the X-axis and Y-axis motion, the runout between the worktable center hole and the worktable, and the worktable rotation. Inspection requirements for the intersection and equidistance between the axis and the positioning datum (see G16 to G20 in the.2017 edition); q) The requirement for perpendicularity inspection between the axis of rotation and the linear motion has been deleted (see G21 to G23 in the.2017 edition); r) The requirement for the perpendicularity test between the rotation axes has been deleted (see G24 of the.2017 edition); s) The intersection inspection requirement between rotation axes has been deleted (see G25 of the.2017 edition); t) Deleted the parallelism test requirement between the rotation axis and the linear motion (see G26 in the.2017 edition); u) Changed the positioning accuracy and repeatability test requirements for linear and rotary axes (see P1 and P2 in Chapter 6,.2017). Versions 6.1 and 6.2); v) Changed the working accuracy inspection requirements (see Chapter 7, Chapter 7 of the.2017 edition); w) Added additional geometric accuracy inspection requirements for AC swing rotary table machine tools (see Appendix A); x) Added additional geometric accuracy inspection requirements for BC swing rotary table machine tools (see Appendix B); y) The additional geometric accuracy inspection requirements for oscillating spindle head machine tools have been changed (see Appendix C, Appendix A of the.2017 edition); z) The additional geometric accuracy inspection requirements for rotary and swinging spindle head machine tools have been changed (see Appendix D, Appendix B of the.2017 edition). 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 was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Metal Cutting Machine Tools (SAC/TC22). This document was drafted by. General Technology Group Machine Tool Engineering Research Institute Co., Ltd., General Technology Group Kunming Machine Tool Co., Ltd., Shenyang Machine Tool Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute, Wuhan Heavy Machine Tool Group Co., Ltd., Kede CNC Co., Ltd. Co., Ltd., National Machine Tool Quality Supervision and Inspection Center, Sichuan Pushiningjiang Machine Tool Co., Ltd., and Zhejiang Keda Machine Tool Co., Ltd. The main drafters of this document are. Xue Ruijuan, Wang Jing, Guo Guoqiang, He Chunshu, Chen Hongjun, Li Chengyong, Yu Chunping, Chen Yanyan, Tan Zhi, Zhang Wei, Huang Zuguang, Xu Haoli, Chen Wei, Zhang Ligang, Cai Minghui, Miao Dan, Zhou Zhigao, Wang Xiao, Jiang Erbiao This document was first published in.2017 and this is the first revision.introductionThe five-axis machining center has the advantages of processing complex surfaces, improving processing accuracy and efficiency, and its precision performance directly affects the product Quality and processing capabilities. With the advancement of technology and the improvement of processing technology, the performance of five-axis linkage machining centers is also constantly improving. In order to meet our This document has been revised to reflect the demand for technological advancement of five-axis machining centers driven by the high-end development of China's machine tools and the transformation and upgrading of its manufacturing industry. GB/T 34880 consists of three parts. --- Part 1.Horizontal machine tool precision inspection. The purpose is to establish the inspection requirements for the factory inspection of five-axis horizontal machining centers. Projects and requirements. --- Part 2.Vertical machine tool precision inspection. The purpose is to establish the inspection requirements for the five-axis linkage vertical machining center during factory inspection. Projects and requirements. --- Part 3.Technical conditions. The purpose is to establish the test to ensure the performance and quality of the five-axis linkage machining center during the manufacturing process Projects and corresponding requirements. This document is the second part of GB/T 34880, which mainly regulates the geometric accuracy, positioning accuracy and weight of five-axis vertical machining centers. The inspection requirements, inspection methods and corresponding tolerances of positioning accuracy and working accuracy can be used for five-axis joint machining of ordinary and precision grades. Provide basis and guidance for the design, manufacture, inspection and acceptance of automatic machining centers. Five-axis machining center inspection conditions Part 2.Accuracy testing of vertical machine tools1 ScopeThis document specifies the geometric accuracy, positioning accuracy and repeat positioning accuracy of the CNC axis, and working accuracy of the five-axis linkage vertical machining center. Inspection requirements, inspection methods and corresponding tolerances. This document is applicable to ordinary (P-level) and precision (M-level) five-axis linkage vertical machining centers with linear axis travel up to.2000mm (hereinafter referred to as machine tools) design, manufacture, inspection and acceptance.2 Normative referencesThe 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 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 GB/T 17421.2-2023 General rules for inspection of machine tools Part 2.Determination of positioning accuracy and repeatability of CNC axes GB/T 17421.7-2016 General Rules for Inspection of Machine Tools Part 7.Geometric Accuracy of Rotary Axis GB/T 19660-2005 Industrial automation systems and integrated machine tool numerical control coordinate systems and motion nomenclature GB/T 25379.1-2010 General components for machine tools - Workpiece pallets - Part 1.Workpiece pallets with nominal dimensions up to 800 mm Row pallet GB/T 25379.2-2010 General machine tool components - Workpiece pallets - Part 2.Workpieces with nominal dimensions greater than 800 mm Traveling pallet GB/T 39953-2021 RTCP precision test for five-axis machining centers GB/T 39967-2021 Accuracy test of S-shaped test pieces for five-axis machining centers3 Terms and DefinitionsThe following terms and definitions apply to this document. 3.1 It has at least five CNC axes, including three linear axes (X, Y, Z) and two rotary axes (A, B, C in any combination), which can realize A vertical machining center with five axes simultaneously participating in interpolation motion.4 General4.1 Units of measurement All linear dimensions, errors and corresponding tolerances in this document are in millimeters (mm); angular dimensions are in degrees (°); The error and the corresponding tolerance are expressed as a ratio, but in some cases, they can be expressed in microradians (μrad) or arc seconds (″). The conversion relationship is as follows. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 34880.2-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 34880.2-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 34880.2-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 34880.2-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 34880.2-2025?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 34880.2-2025 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. |
