GB/T 40803-2021 PDF English
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GB/T 40803-2021: Machining process - Method for energy efficiency evaluation---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/GBT40803-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.020
CCS J 30
GB 40803-2021
Machining process - Method for energy efficiency evaluation
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
FOREWORD ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 4
4 Evaluation index system ... 6
5 Obtaining methods of evaluation indexes ... 6
6 Evaluation procedure and requirements ... 10
7 Requirements for the preparation of the evaluation report ... 13
Appendix A (Informative) Example of energy efficiency evaluation of the machining
processes ... 14
Machining process - Method for energy efficiency evaluation
1 Scope
This document specifies the energy efficiency evaluation index system, index obtaining
method, evaluation procedure and evaluation report preparation in the machining
process.
This document applies to the energy efficiency evaluation of metal cutting machine
tools in the machining process; the energy efficiency evaluation of other machining
processes can be implemented with reference to this document.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this
document through normative references in the text. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 4863, General terminology of machine-building technology
GB/T 6477, Metal-cutting machine tools - Terminology
GB/T 40799, Machining process - Test methods for essential energy efficiency data
3 Terms and definitions
Terms and definitions determined by GB/T 4863, GB/T 6477 and GB/T 40799, and the
following ones are applicable to this document.
3.1
specific energy consumption
The ratio of the total energy consumption in the machining process to the effective
output.
Note: The effective output can be expressed by the material removal volume or the
number of qualified workpieces.
3.2
specific energy consumption per workpiece
Energy consumption in standby period, energy consumption in idling period, energy
consumption in cutting period and energy consumption for material removal shall be
detected and obtained according to the methods that are specified in GB/T 40799.
5.2 Obtaining method of effective energy utilization ratio
According to the method that is specified in GB/T 40799, obtain the total energy
consumption in the machining process and the energy consumption for material
removal; calculate the effective energy utilization ratio according to Formula (1).
Where:
ηt – the effective energy utilization ratio in the machining process, expressed in %;
Emr – the energy consumption for material removal in the machining process, in
kilowatt-hours (kW·h);
Et – the total energy consumption in the machining process, in kilowatt-hours (kW·h).
5.3 Obtaining method of specific energy consumption per workpiece
According to the method that is specified in GB/T 40799, obtain the total energy
consumption in the machining process; count the number of qualified workpieces in the
machining process; calculate the specific energy consumption per workpiece according
to Formula (2).
Where:
SN – the specific energy consumption per workpiece in the machining process, in
kilowatt-hours per piece (kW·h/piece);
N – the number of qualified workpieces (pieces) in the machining process.
5.4 Obtaining method of specific energy consumption per volume of cutting
material
According to the method that is specified in GB/T 40799, obtain the total energy
consumption in the machining process, and calculate the specific energy consumption
per volume of cutting material according to Formula (3).
Where:
SV – the specific energy consumption per volume of cutting material in the machining
process, in kilowatt-hours per cubic meter (kW·h/m3);
V – the material removal volume in the machining process, which can be obtained by
accumulating the material removal volume of each qualified workpiece, in cubic
meters (m3).
Where, the obtaining method of the material removal volume of a single qualified
workpiece is as follows:
a) Use the geometric calculation method or the drainage method to obtain the volume
of the qualified workpiece before and after machining; obtain the material
removal volume of a single workpiece by calculating the volume difference
between the two;
b) Measure the mass of a qualified workpiece before and after machining,
respectively, by the weighing method; calculate the material removal volume of
a single workpiece according to Formula (4).
Where:
Vi – the material removal volume of a single workpiece, in cubic meters (m3);
W0 – the mass of the qualified workpiece before machining, in kilograms (kg);
W1 – the mass of the qualified workpiece after machining, in kilograms (kg);
ρ – the material density of the removal material of the qualified workpiece, in kilograms
per cubic meter (kg/m3).
5.5 Obtaining method of standby energy consumption ratio
According to the method that is specified in GB/T 40799, obtain the total energy
consumption in the machining process and the energy consumption in standby period;
calculate the standby energy consumption ratio according to Formula (5).
Where:
γst – the standby energy consumption ratio in the machining process, expressed in %;
-- The selected machining process belongs to the complete machining process of one
or more workpieces processed by the machine tool;
-- The workpieces to be machined have the same specifications.
After the machining process is selected, the processing time period, machine tool model
and workpiece model of the selected machining process shall be recorded.
6.3 Selection of evaluation indexes
6.3.1 According to the evaluation requirements, select the energy efficiency evaluation
indexes of the machining process.
6.3.2 To evaluate the comprehensive energy efficiency of the machining process, one
or more comprehensive evaluation indexes shall be selected from the effective energy
utilization ratio, specific energy consumption per workpiece and specific energy
consumption per volume of cutting material. Where:
-- When evaluating the overall energy efficiency of different machine tools in
processing the same workpiece, give priority to the specific energy consumption
per workpiece;
-- When evaluating the overall energy efficiency of the machine tool in processing
different materials, give priority to the specific energy consumption per volume
of cutting material;
-- When evaluating the overall energy efficiency of the two machining processes
with large differences (such as different machine tools and workpiece
specifications), give priority to the effective energy utilization ratio.
6.3.3 To evaluate the energy efficiency of a single item in the machining process, the
single evaluation indexes shall be selected according to the following principles:
-- When evaluating the energy efficiency of the standby process, select the energy
consumption in standby period and the standby energy consumption ratio;
-- When evaluating the energy efficiency of the idling process, select the energy
consumption in idling period and the idling energy consumption ratio;
-- When evaluating the energy efficiency of the cutting process, select the energy
consumption in cutting period and the cutting energy consumption ratio;
-- When evaluating the selection of cutting parameters in the cutting process, select
the energy consumption for material removal and the cutting energy utilization
ratio.
6.4 Formulate a reference value for the evaluation index
6.4.1 The reference value of the evaluation index is the basic reference for quantifying
the energy efficiency gap and guiding the optimization of energy efficiency in the
energy efficiency evaluation process, which can be formulated according to the
reference method and the test method.
6.4.2 Reference method. If the energy consumption limit standard of the machining
process and the advanced energy efficiency value of the same machining process in the
industry have been published, refer to the energy consumption limit standard and the
advanced value of the industry to select the reference value for the evaluation index.
6.4.3 Test method. Formulate a reference value for the evaluation index through an
actual test. The specific steps are as follows:
a) Select a section of machining process. Among them, the selected machining
process shall meet the requirements that the machine tool does not fail during
machining, the workpieces to be machined have the same specifications and are
all qualified parts, and the number of qualified workpieces is not less than 3;
b) According to the method that is described in Chapter 5, obtain the calculated value
of the energy efficiency evaluation index in the machining process of each
qualified workpiece;
c) Rank the calculated values of each evaluation index in the machining process of
each qualified workpiece in descending order;
d) Select the maximum value in the ranking as the maximum reference value of the
evaluation index; select the minimum value in the ranking as the minimum
reference value of the evaluation index.
e) For the four indexes of energy consumption in standby period, energy
consumption in idling period, energy consumption in cutting period and energy
consumption for material removal, the reference value is the product of the
reference value of the evaluation index of a single workpiece and the number of
qualified workpieces in the machining process to be evaluated.
See A.3 for a specific example.
6.5 Obtain the calculated value of the evaluation index
According to the method that is specified in Chapter 5, obtain the calculated value of
the energy efficiency evaluation index of the machining process. At the same time, the
obtaining process of the calculated value of the evaluation index shall meet the
requirements of GB/T 40799.
6.6 Determine the evaluation results
Compare the calculated value of each evaluation index with its reference value, to
determine the evaluation result. Where:
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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