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GB/T 40808.4-2026: Environmental evaluation of machine tools - Part 4: Principles for measuring metalforming machinery with respect to energy efficiency
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Environmental evaluation of machine tools - Part 4: Principles for measuring metalforming machinery with respect to energy efficiency
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Basic data | Standard ID | GB/T 40808.4-2026 (GB/T40808.4-2026) | | Description (Translated English) | Environmental evaluation of machine tools - Part 4: Principles for measuring metalforming machinery with respect to energy efficiency | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J62 | | Classification of International Standard | 25.120.10 | | Word Count Estimation | 90,979 | | Date of Issue | 2026-02-27 | | Date of Implementation | 2026-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 40808.4-2026: Environmental evaluation of machine tools - Part 4: Principles for measuring metalforming machinery with respect to energy efficiency
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ICS 25.120.10
CCSJ62
National Standards of the People's Republic of China
Machine tool environmental assessment
Part 4.Principles for Measuring the Energy Efficiency of Forging Machinery
Published on 2026-02-27
Implemented on 2026-09-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface V
Introduction VI
1.Scope 1
2 Normative References 1
3.Terms and Definitions 2
4.Measurement program's corresponding operating status 4
4.1 Power-off running state 4
4.2 Main switch on/operating status 4
4.3 Auxiliary drive device in operation status 4
4.4 Main drive unit in operation status 4
4.5 Production Preparation Mode Operation Status 4
4.6 Processing Operation Status 4
4.7 Mold Changing Operation Status 4
4.8 Typical Results of Power Measurement 5
5.Energy supply assessment for different types of machine tools
5.1 General Rules 5
5.2 Energy Supply for the Press 5
5.3 Energy supply for the bending machine 12
5.4 Energy supply for the pipe bending machine 16
5.5 Energy supply for rotary head press 18
5.6 Energy Supply of Laser Cutting Machine Tools 22
5.7 Energy supply for auxiliary devices 27
6 Report 28
Appendix A (Informative) Hydraulic Press 29
A.1 Example 29 of an upward-moving hydraulic press (double-acting)
A.2 Power Measurement 30
A.3 Energy Calculation Formula for Hydraulic Press Cycle (Upward-Moving Hydraulic Press) 38
A.4 Example 40.Functional Quantification Diagram of a Double-Action Hydraulic Press
Appendix B (Informative) Mechanical Press 42
B.1 Example 42 of an upward-moving mechanical press
B.2 Power Measurement 43
B.3 Energy Calculation Formula for Mechanical Press Cycle (Upward-Moving Press) 48
B.4 Example 50 of the functional quantification diagram of a mechanical double-action press
Appendix C (Informative) Hydraulic Sheet Metal Bending Machine 52
C.1 Example 52 of a hydraulic sheet metal bending machine
C.2 Power Measurement of Hydraulic Sheet Metal Bending Machine 52
C.3 Energy Calculation Formula for Hydraulic Sheet Metal Bending Machine Cycle (Upward-Moving Bending Machine) 56
C.4 Example 58.Functional Quantification Diagram of Hydraulic Sheet Metal Bending Machine
Appendix D (Informative) Rotary Head Press 59
D.1 Servo Rotary Head Press Example 59
D.2 Power Measurement of Servo Rotary Head Press 60
D.3 Energy Calculation Formula for Servo Rotary Head Press 62
D.4 Example of a functional quantification diagram for a servo rotary head press (64)
Appendix E (Informative) Laser Cutting Machine 66
E.1 Example 66 of a laser cutting machine tool
E.2 Power Measurement of Flying Optical Laser Cutting Machine Tool 67
E.3 Energy Calculation Formula for Laser Cutting Machine Tools 72
E.4 Example 75 of the Functional Quantification Diagram of Laser Cutting Machine Tools
Appendix F (Informative) Pipe Bending Machine 77
F.1 Pipe Bending Machine Example 77
F.2 Power Measurement of Pure Electric Pipe Bending Machine 77
F.3 Energy Calculation Formula for Pure Electric Pipe Bending Machine 80
F.4 Example 81.Functional Quantification Diagram of a Pure Electric Pipe Bending Machine
References 83
Figure 1.Typical average power supplied under different operating conditions.
Figure 2.System boundaries of hydraulic (servo) presses and mechanical (servo) presses.
Figure 3.Typical operating cycle diagram of an upward-moving press.
Figure 4.Typical hydraulic press cycle 9
Figure 5.Typical stamping cycle of a mechanical (servo) press 10
Figure 6.Example 12 of a hydraulic or mechanical double-acting press equipped with pads.
Figure 7 System boundary of the bending machine 13
Figure 8.Schematic diagram of a typical bending machine cycle 14
Figure 9.Typical test cycle (intermittent operation) for a hydraulic (servo)/mechanical (servo) bending machine. 15
Figure 10 System boundary of the pipe bending machine 16
Figure 11 Test workpiece 18 bent at 90° intervals every.200 mm
Figure 12 System boundary of the rotary head press 18
Figure 13 Common Rotary Head Press Circulation Diagram 20
Figure 14.Sample piece machined by rotary head press. Figure 21.
Figure 15 System boundary of laser cutting machine tool 22
Figure 16.Action cycle diagram of a typical laser cutting machine tool 24
Figure 17.Draft of the machined specimen (a) 26
Figure 18.Draft of the machined specimen (b) 27
Figure 19 System boundary of machine tool auxiliary device 27
Figure A.1 Example 29 of an upward-moving hydraulic press (double-acting)
Figure A.2 Example of a slide hydraulic system for an upward-moving hydraulic press 30
Figure A.3 Example of slide power in hydraulic press cycle 31
Figure A.4 Example of a slide hydraulic system for an up-moving hydraulic servo press 33
Figure A.5 Example 35 of a hydraulic molding pad without energy recovery
Figure A.6 Example 37 of a hydraulic molding pad with energy recovery
Figure B.1 Example 42 of an upward-moving mechanical press
Figure B.2 Example of drive unit and balancing system of mechanical (servo) press 43
Figure B.3 Example of slider power in a mechanical servo press cycle 44
Figure B.4 Example of a hydraulic molding pad without energy recovery 46
Figure B.5 Example of a hydraulic molding pad with energy recovery 47
Figure C.1 Example 52 of an upward-moving hydraulic sheet metal bending machine
Figure C.2 Example of the hydraulic system of an upward-moving sheet metal bending machine 53
Figure C.3 Typical example of slide power in a hydraulic sheet metal bending machine cycle 54
Figure D.1 Example 59 of a dual-drive AC servo rotary head press
Figure D.2 Example 60 of a servo rotary head press drive unit
Figure D.3 Power example of a servo rotary head press 61
Figure E.1 Example 66 of a flying optical laser cutting machine tool
Figure E.2 Example 67 of a shaft drive motor
Figure E.3 Example 68 of a laser generator and cooler
Figure E.4 Equivalent power of the cooler during laser generator operation 69
Figure E.5 Example of power during the working cycle of a laser cutting machine tool 70
Figure F.1 Example 77 of a pure electric pipe bending machine
Figure F.2 Example of a drive unit for a pure electric pipe bending machine 78
Figure F.3 Example of power of pure electric pipe bending machine 79
Table 1.Shortest measurement cycle under specific shift conditions (6)
Table 2 Test Cycle Settings for the Hydraulic Press 9
Table 3 Test Cycle Settings for Mechanical Presses (10)
Table 4 Test Cycle Settings for Mechanical Servo Press (10)
Table 5.Shortest measurement period under specific shift conditions 13
Table 6 Test Cycle Settings for Hydraulic (Servo)/Mechanical (Servo) Bending Machines 15
Table 7.Shortest measurement period under specific shift conditions (17)
Table 8.Test Cycle Settings for Pipe Bending Machine (17)
Table 9.Shortest measurement period under specific shift conditions.
Table 10 Recommended specimen specifications for rotary head press test cycles 21
Table 11 Shortest measurement period for specific shifts 23
Table 12 Recommended specimen size for laser cutting machine tool test cycles 25
Table 13 Test Cycle Settings for Laser Cutting Machines Required to be Reported (25)
Table A.1 Example 40 of the Functional Quantification Chart
Table B.1 Example 51 of Functional Quantification Chart
Table C.1 Example 58 of the Functional Quantification Chart
Table D.1 Example 65 of the Functional Quantification Chart
Table E.1 Example 76 of Functional Quantification Chart
Table F.1 Example 82 of Functional Quantization Chart
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 is Part 4 of GB/T 40808 "Machine Tool Environmental Assessment". GB/T 40808 has already published the following parts.
---Part 1.Energy-Saving Design Methods for Machine Tools;
---Part 2.Methods for measuring energy consumption of machine tools and machine tool components;
---Part 3.Principles for Energy Efficiency Testing of Metal Cutting Machine Tools;
---Part 4.Principles for measuring the energy efficiency of forging and pressing machinery.
This document is modified to adopt ISO 14955-4.2019 "Machine tools - Environmental assessment - Part 4.Metal forming machine tools and laser processing machine tools".
The principle of energy measurement in a bed.
The technical differences between this document and ISO 14955-4.2019, and the reasons therefor, are as follows.
---The test specimen material was changed from SPCC, DC01, and 1033 to cold-rolled seamless steel pipe (see Table 8 in 5.4.5) to conform to my country's steel material standards.
Requirements. Standardize testing conditions;
---The specimen material was changed from SPCC, DC01, and 1033 to Q235A cold-rolled steel sheet to meet my country's steel material requirements and standardize testing.
Test conditions (see Table 10 in 5.5.5);
---The specimen material was changed from SPCC, DC01, and 1033 to Q235A cold-rolled steel sheet to meet my country's steel material requirements and standardize testing.
Test conditions (see Table 12 in 5.6.5).
The following editorial changes have been made to this document.
---To align with existing standards, the standard title has been changed to "Machine Tool Environmental Assessment Part 4.Principles for Measuring the Energy Efficiency of Forging Machinery";
---The definition source for laser cutting machine tools (see 3.9 of ISO 14955-4.2019) has been removed, and the definition example for tools/molds has also been removed.
(See 3.13 of ISO 14955-4.2019);
---Added mentions of formulas (E.1) and (E.2) (see E.2.1).
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. Ruitai Machine Tool (Suzhou) Co., Ltd., Jiangsu Yawei Machine Tool Co., Ltd., and Guangdong Forging & Pressing Machine Tool Factory.
Limited Liability Company, Zhejiang Jin'aolan Machine Tool Co., Ltd., Huace Testing & Certification Group Co., Ltd., Ningbo Aomat High-Precision Stamping Machine Tool Co., Ltd.
Limited Liability Company, Jinan No.2 Machine Tool Group Co., Ltd., Yangli Group Co., Ltd., Qingdao Hongda Forging and Pressing Machinery Co., Ltd., China Heavy Machinery
Research Institute Co., Ltd., Trumpf (China) Co., Ltd., Kunshan Beiju Machinery Co., Ltd., Anqing Normal University, Inspection and Testing Department of Jinan Foundry and Forging Institute
Technology Co., Ltd., Zhejiang Dongrui Machinery Industry Co., Ltd., Shandong Enlechi Forging Co., Ltd., Dongguan Faster Precision Technology Co., Ltd.
The company, Guangdong Chuangsheng Intelligent Manufacturing Co., Ltd., Zhejiang Jinfulong Machine Tool Accessories Co., Ltd., and China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd.
company.
The main drafters of this document are. Li Zhenguang, Wang Jinrong, Lu Jinwei, Chen Qiuhong, Yang Hui, Wang Minggang, Liu Panchao, Zhong Taisheng, Wang Shechang, and Zheng Shuling.
Li Jianping, Lu Keping, Li Shuangyu, Wang Yuanzhi, Ma Liqiang, Jin Weike, Xi Yao, Zhang Jun, Yu Zhenwei, Wu Nengsong, Huang Pan, Li Jianqun, Lei Shuai, Zhang Xiaofei
Qiu Mingjun, Su Yukuo, Fan Yulin, Feng Dongxiao, Jiang Jiansheng, Lin Xinlong, Sun Huangsheng, Wang Hua, Nie Yuhan.
Introduction
As natural resources become increasingly scarce, environmental impact has become a common issue that all products must address. Therefore, it is necessary to formulate and promote [the relevant policies/measures].
Environmental assessment standards for machine tools.
Machine tools are industrial machines used to manufacture parts, semi-finished products, and complex industrial products. Their environmental impact includes wasting raw materials and lubrication...
The use of auxiliary substances such as media and other fluid materials, as well as the conversion of electrical energy into heat energy, the dissipation of heat into the atmosphere, or heat exchange through fluids.
Alternatively, use other resources, such as compressed air.
Based on relevance considerations, the GB/T 40808 series of standards for machine tools focuses on the environmental impact during the usage phase and is proposed to be implemented by five departments.
Composed of components.
---Part 1.Energy-Saving Design Methods for Machine Tools. The aim is to provide methods for reducing the environmental impact of energy consumption during machine tool operation.
Machine Tool Design and Manufacturing Guidelines;
---Part 2.Methods for Measuring Energy Consumption of Machine Tools and Machine Tool Components. The purpose is to provide necessary methods for measuring the energy consumption of machine tools and machine tool components.
Parameters and calculation methods;
---Part 3.Principles for Energy Efficiency Testing of Metal Cutting Machine Tools. The purpose is to provide guidelines for energy efficiency testing of metal cutting machine tools as specified in GB/T 40808.1 and GB/T 40808.2.
Application principles and methods in machine tools;
---Part 4.Principles for Measuring the Energy Efficiency of Forging Presses. The purpose is to provide the standards for measuring the energy efficiency of forging presses as specified in GB/T 40808.1 and GB/T 40808.2.
Application principles and methods in machinery;
---Part 5.Energy Efficiency Testing Principles for Woodworking Machine Tools. The purpose is to provide guidelines for energy efficiency testing of woodworking machine tools according to GB/T 40808.1 and GB/T 40808.2.
Application principles and methods in bed.
The key data for investing in machine tools are multifaceted, including their economic value, technical specifications, and operational requirements, which are influenced by the actual application.
The energy supplied to the same machine tool will vary depending on the workpiece being manufactured and the machine tool's operating conditions. Therefore, if these factors are not considered...
Without this information, it is impossible to conduct an environmental assessment of the machine tool.
Machine tool environmental assessment
Part 4.Principles for Measuring the Energy Efficiency of Forging Machinery
1 Scope
This document specifies the technical requirements and measures for energy testing procedures adopted by personnel designing, manufacturing, and supplying forging machinery, in order to obtain...
Repeatability data of the energy supplied under specified conditions. Furthermore, this document specifies a method for quantifying the energy supplied to the components.
The proportion of machine tools is determined according to the functions described in GB/T 40808.1-2021.
Together with GB/T 40808.1-2021 and GB/T 40808.2-2025, this document covers hydraulic (servo) and mechanical (servo) pressure.
The demand for rotary head presses, bending machines, pipe bending machines, and laser cutting machine tools when used as intended and under conditions foreseen by the manufacturer.
It has energy. An example of how to perform an energy assessment for a metal forming machine tool is given in the appendix.
This document applies to the mechanical transmission of force or the use of lasers to transmit energy, thereby enabling the transmission of force through components mounted on or driven by sliders, punches, or beams.
Machine tools that use moving molds to cut, shape, or process metal or other materials. The size range of these machine tools covers everything from small to large.
This document covers a wide range of machine tools, from high-speed (for machining small workpieces) to large, relatively low-speed machine tools and large workpieces. The main uses of the machine tools discussed in this document are...
It can be used to process metals, but it is also applicable to processing other materials (such as cardboard, plastics, rubber, leather, etc.) in the same way.
This document also applies to auxiliary devices provided as an integral part of forging machinery, as well as those forming part of a joint.
The machine tools used in the manufacturing system require energy comparable to those used by a standalone machine tool.
This document does not provide test procedures for the energy requirements of cutting tools or dies installed on forging machinery.
This document does not apply to machine tools primarily designed for the following purposes.
---Metal cutting is performed through milling, drilling, or turning;
---Metal cutting using oxygen or water cutting;
---Connections and fasteners, such as riveting and splicing;
--- Bending with a folding machine;
---Straightening;
---extrusion;
---Die forging, free die forging;
---Metal powder forming;
---A single-purpose stamping machine specifically designed for profiles, such as those used in the construction industry;
---Processed using an air hammer;
---Processed using a pneumatic press.
Note. Mechanical servo presses are also known as servo electric presses.
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 40808.1-2021 Machine tool environmental assessment – Part 1.Energy-efficient design methods for machine tools (ISO 14955-1.2017, IDT)
GB/T 40808.2-2025 Environmental assessment of machine tools – Part 2.Methods for measuring energy consumption of machine tools and machine tool components (ISO 14955-
2.2018, IDT)
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