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NC press brake - Testing of the accuracy
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GB/T 33644-2025
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| GB/T 33644-2017 | English | 219 |
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NC press brake -- Testing of the accuracy
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GB/T 33644-2017
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Basic data | Standard ID | GB/T 33644-2025 (GB/T33644-2025) | | Description (Translated English) | NC press brake - Testing of the accuracy | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J62 | | Classification of International Standard | 25.120.10 | | Word Count Estimation | 14,176 | | Date of Issue | 2025-10-31 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 33644-2017 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 33644-2025: NC press brake - Testing of the accuracy---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 25.120.10
CCSJ62
National Standards of the People's Republic of China
Replaces GB/T 33644-2017
CNC sheet metal bending machine precision
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This 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 replaces GB/T 33644-2017 "Precision of CNC Sheet Metal Bending Machines". Compared with GB/T 33644-2017, the main differences are in the structural design.
Aside from integration and editorial changes, the main technical changes are as follows.
---The specimen width requirement has been changed (see 4.2.2, 3.2.2 in the.2017 version);
---The specimen thickness requirements have been changed (see Table 2 in 4.2.3, 3.2.3 in the.2017 version);
---The requirement for test specimens for thermal cutting has been removed (see 3.2.10 in the.2017 version);
---Added longitudinal tolerance requirements for the flatness of worktables with a diameter of 12000mm or more (see 5.1.1.1.1);
---The longitudinal tolerance for the parallelism between the horizontal support surface of the mating surface with the upper mold and the worktable surface has been changed (see 5.1.2.1.1,.2017 version).
(4.1.2.1.1)
---The lateral tolerance for the parallelism between the horizontal support surface of the mating surface with the upper mold and the worktable surface has been changed (see 5.1.2.1.2,.2017 version).
(4.1.2.1.2)
---The longitudinal tolerance inspection method for the parallelism between the horizontal support surface of the upper mold mating surface and the worktable surface has been modified (see 5.1.2.2.1).
(2017 version 4.1.2.2.1)
---The method for checking the lateral parallelism tolerance of the horizontal support surface of the upper mold contact surface to the worktable surface has been modified (see 5.1.2.2.2).
(2017 version 4.1.2.2.2)
---The allowable tolerance for the X-axis positioning accuracy of the stop device has been changed (see 5.2.1.1, 4.1.4.1 in the.2017 version);
---The positioning accuracy requirement for the R-axis of the material stop device has been increased (see 5.2.2);
---The repeatability accuracy requirement for the R-axis of the material stop device has been increased (see 5.2.4);
---The method for verifying the positioning accuracy of the slider has been changed (see 5.2.5.2, 4.1.6.2 in the.2017 version);
---The method for verifying the repeatability of the slider has been changed (see 5.2.6.2, 4.1.7.2 in the.2017 version);
---The tolerance value for the bending angle of the specimen has been changed (see 5.3.1.1, 4.2.1.1 in the.2017 version);
---The test method for the straightness of the specimen bending has been changed (see 5.3.2.2, 4.2.2.2 in the.2017 version).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no 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 on Standardization of Forging and Pressing Machinery (SAC/TC220).
This document was drafted by. Jiangsu Yawei Machine Tool Co., Ltd., Ruitie Machine Tool (Suzhou) Co., Ltd., and Tianshui Forging & Pressing Machine Tool (Group).
Limited Liability Company, Nanjing Jinquan CNC Machine Tool Co., Ltd., Nanjing Lanhao Intelligent Technology Co., Ltd., Trumpf (China) Co., Ltd., Qingdao Dadong Automation Co., Ltd.
Automation Technology Co., Ltd., Anhui Donghai Yuxiang Intelligent Equipment Technology Co., Ltd., Yangli Group Co., Ltd., Zhejiang Gaozi Technology Co., Ltd.
The company, Aike (Suzhou) Machinery Co., Ltd., Jiangsu Langkes Intelligent Industrial Technology Co., Ltd., Xuzhou Dayi Heavy Forging Technology Co., Ltd., Jinan
Foundry and Forging Inspection and Testing Technology Co., Ltd.
The main drafters of this document are. Wang Jinrong, Chen Hong, Chen Hui, Li Zhenguang, Liu Kouyu, Lan Zhoujun, Chen Jing, Liu Xiuchen, Gu Zhaoyong, and Shi Xianlin.
Zhong Taisheng, Cai Guohua, Hu Dengke, Zhou Zechen, Wang Haiping, Lin Xinlong, Wang Hua, Nie Yuhan.
The release history of this document and the document it replaces is as follows.
---First published in.2017 as GB/T 33644-2017;
---This is the first revision.
CNC sheet metal bending machine precision
1 Scope
This document specifies the inspection requirements and accuracy testing procedures for CNC sheet metal bending machines.
This document applies to the accuracy inspection activities of CNC sheet metal bending machines.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 8170 Rules for rounding off numerical values and representation and determination of limiting values
GB/T 10923-2009 General Rules for Precision Inspection of Forging Machinery
GB/T 34376 Technical Requirements for CNC Sheet Metal Bending Machines
3 Terms and Definitions
The terms and definitions defined in GB/T 34376 apply to this document.
4.Inspection Requirements
4.1 General Requirements
4.1.1 Before the accuracy inspection, the installation level of the sheet metal bending machine should be adjusted. After the machine tool is leveled, the deviation should not exceed 0.20/1000 in either the longitudinal or transverse direction.
4.1.2 The inspection of geometric accuracy and CNC accuracy shall be carried out under no-load conditions.
4.1.3 Accuracy verification should be performed after the full-load test.
4.1.4 During the accuracy inspection process, no adjustments should be made to mechanisms and parts that affect accuracy.
4.1.5 The accuracy inspection and the measuring instruments used for inspection shall comply with the provisions of GB/T 10923.
4.1.6 When the actual measured length is less than the allowable length, it shall be converted to the actual measured length, and the conversion result shall be rounded according to GB/T 8170.
Down to the micrometer number of bits.
4.1.7 The limit deviations for specimen length and width are ±2mm, and the limit deviations for specimen thickness are ±0.3mm.
4.1.8 For CNC bending machines with multiple machines operating in tandem, geometric accuracy and working accuracy are tested on a single machine basis.
4.2 Working accuracy inspection conditions
4.2.1 The specimen length shall meet the requirements of Table 1.
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GB/T 33644-2025: NC press brake - Testing of the accuracy
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