Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG 707—2003
Torque Wrenches
2003-09-23 Issued
2004-03-23 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG707
Verification Regulation
of Torque Wrenches
JTG 707
Replaced, LJG 707-1990
This verification procedure was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 23, 2003, and came into effect on March 23, 2004
Responsible unit:
Main drafting unit:
Participating drafting units:
National Torque Measurement and Elasticity Meter Technical Committee, Shanghai 704 Research Institute, National Defense Torque Measurement Professional Station, China People's Science and Technology Commission Research Institute
Beijing Aircraft Maintenance Engineering Co., Ltd.
Shandong Ganzhao Dongfang Jijing Co., Ltd.
This regulation is entrusted to the National Technical Committee for Force and Hardness Metrology to interpret this regulation. Main drafters:
Shang Weilu
Chen Yongpei
Art drafters:
Yanluemeng
Qiansushi
Dou Hongliang
.1JG 7 No. 7——2003
(Shanghai 704 Institute National Defense Torque Measurement Professional Station) (Shanghai 704 Institute National Defense Chain Measurement Professional Station) (Shanghai 704 Institute National Defense Torque Measurement Professional Station) (China Institute of Metrology)
(China Institute of Metrology)
(Beijing Aircraft Maintenance Engineering Co., Ltd.) (Beijing Aircraft Maintenance Engineering Co., Ltd.) (Shan Ya H Zhao Le Fang Metrology Co., Ltd.)
2 References
3 Overview
3.1 Application
3.2 Classification
4 Basic performance requirements
JJG 707—20L3
1.1 Relative error of indication, repeatability of indication, resolution of indication 4.2
Seasonal error of indication
4.3 Overload performance
5 General technical requirements
Outer gauge structure and accessories
Operation adaptability
5.3 Measuring base range
6 Measuring base instrument control
Verification conditions
Verification items and verification methods
Verification result processing
Verification completion period
Appendix
Appendix 13
Appendix "
Measuring base calibration device 1. Brief description of the working principle of the torque sensor calibration device Brief record
Calibration diagram of torque wrench with torque amplifier Working principle Schematic diagram Format of the inner page of the calibration certificate (1)
Format of the inner page of the calibration certificate or (2)
Format of the inner page of the calibration result notification (1)
Format of the inner page of the calibration result notification (2)
Appendix II
Calibration record of torque wrench (1)
Appendix II:
Calibration record of torque wrench (2)
1 Scope
Calibration procedure for torque wrenches
This procedure is for the initial inspection, final inspection and intermediate inspection of a quick-acting torque wrench and a quick-acting torque screwdriver with a thermal drill structure and a frequency measuring single mechanism (including accessories). References
CR15729—1995 Technical conditions for use of square wrenches [3673-1992 Requirements and test methods for assembly of threaded fasteners (screws, nuts and nuts)
3 Overview
3.1 Purpose
A new tool for dynamic expansion
The torque wrench is a measuring instrument for torque measurement of motor vehicles. It is used to tighten screws and nuts and can output the torque value during tightening:
3 .2 Classification
According to the power source used, the torque plates are divided into four categories: dynamic, mechanical, pneumatic and pressure. According to the measuring principle, they are generally divided into indication type and preload type; the indication type is divided into pointer type and digital type; the latter can be divided into mechanical type and electronic type:
4 Measurement performance requirements
4.1 Relative error of indication, indication repeatability, indication component of torque The relative error, indication repeatability and torque component of torque shall comply with the requirements of Table 1. Table 1 Relative error of indication, indication weight, indication resolution Indication accuracy Relative error of indication Index type Indication distribution type Minimum digit of each scale shall not be less than 1/2 of the allowable error value of 2% of the rated torque Pre-tube type Special requirements 4.2 Indication pull-back error JJG7072003 tt||Indicator zero return error, pointer type is not more than 0.2 divisions, digital type is one digit 4.3 Overload performance
The first calibration should be carried out by applying 12D% of the rated torque value in the direction of use, and maintain 3mm. After loading, the components should not produce permanent deformation or damage: 5 General technical requirements
5.1 Appearance structure and accessories
5.1.1 The torque plate should indicate the name, model, specification, mark, degree, direction of torque application, manufacturer's name or trademark, factory number and factory date of the torque wrench. 5.1.2 The twist pin wrench and its accessories should not have cracks, damage, rust and other defects. The accessories should be intact and the components should not be arbitrarily loose.
5.1.3 The arm and joint parts of the torque wrench should have sufficient rigidity and meet the relevant technical requirements of "CB/T15729-1995 General Technical Conditions for Torque Wrench". The connection of each component should be semi-solid and reliable. 5.2 Operation adaptability
5.2.1 When the torque wrench is pressed, the wrench joint should be able to rotate smoothly without sticking. The ball or movable lock of the locking device should be movable and should not slide out. It should be able to connect the set reliably. 5.2.2 The pointer-type indicating device should not be loose or bent. The pointer and passive needle should be parallel to the dial surface and can coincide with the scale mark. During the torque application process, the pointer and passive needle should run smoothly without impact, stagnation and other abnormal phenomena. The pointer width should not be greater than 1/5 of the scale value: S.2.3 The reverse setting of the reserved torque wrench should be flexible: the required torque value should be set when setting. When the applied torque value reaches the set signal, it should be able to emit an audible or other multiple signal. 5.3 Measurement range
The measurement range of the torque wrench is 20% to 1% of the set torque value. 6 Measuring instrument control
Measuring instrument control includes: initial verification, subsequent verification and in-use inspection. 6.1 Verification conditions
6.1.1 Environmental conditions
The torque wrench should be verified under environmental conditions of 10℃-30℃ and relative humidity not less than 85%. 6.1.2 Verification equipment
Torque wrench standard verification transposition (hereinafter referred to as standard device): In the verification, the expanded uncertainty of the standard value given by the standard device is 1/31/10 of the maximum allowable error of the torque wrench being tested. 6.2 Verification items and verification methods
Verification items are shown in Table 2.
6.2.1 Appearance inspection shall be carried out in accordance with general technical requirements 5.1.1~5.1.3. 6.2.2 Check the indication value zeroing according to the requirement of 4.2. 6.2.3 Check the overload test according to the requirement of 4.3: 2
Calibration items
Indication value zeroing
LJG7072003
Table 2 List of calibration items
First calibration
Subsequent calibration
Net: -, "+" means completion, "" means completion does not require more than one month. 6.2.4 Requirements for indication value calibration
Calibration during use
Center. 2.4.1 Calibration points: Within the specified measuring range, the calibration points shall be evenly distributed, with no less than 3 points in total, which must include the lower limit and the limit point of the measuring range. Preset torque wrenches can be calibrated according to the set value points used. 6.2.4.2 When the torque wrench is equipped with an adapter or torque multiplier, it should be checked in combination with the torque adapter or multiplier.
6.2.4.3 Before calibration: pre-tighten 3 times according to the rated torque value: If it is a bidirectional torque wrench: pre-tighten 3 times according to the rated torque value when performing reverse calibration: After the value of the set torque wrench is changed, pre-tighten 3 times again. 6.2.4.4 When applying torque
, apply the torque load steadily according to its use method, and no impact should occur. 6.2.4.5 Verification method
! Verification of dynamic indicating torque wrench
1) According to the rated torque value of the torque wrench, correctly select the standard setting of the display range, and adjust the position of the standard device and the torque plate indicator respectively before installation. Correctly install the torque wrench as a standard push device, and then apply torque to the rated torque value steadily according to the selected verification point, read and record the point torque value, this process should be carried out at least 3 times, after each application to the rated torque value, unload the load, check the torque wrench indicator to zero, and readjust the position, the dynamic pointer must drive the driven pointer to perform the verification: 2) Use the method of adding force value silicon code with the force arm net disk, the force arm length (1) remains unchanged, and add the force value code () to achieve the required torque value requirement. Fix the torque wrench handle, install the torque wrench head on the center of the disk, adjust the torque wrench indicator to zero, and then step steadily. Apply the force value at the calibration point and read the torque value of the torque wrench. This process should be repeated at least 3 times. [See Appendix Ah for a simplified diagram] Calibration of manual preset torque wrench
According to the rated torque value of the torque wrench, correctly select the standard device, adjust the torque wrench to the required calibration point, and then correctly install the torque wrench on the standard device, adjust the zero position of the standard push device, select the peak hold function of the standard device, and steadily apply torque until the torque indicator emits an audible or other signal. At this time, the torque wrench automatically releases the load, sets and records the torque value, and this process is repeated at least 3 times for each point. e) Calibration of hydraulic torque wrench (simplified diagram in Appendix) The hydraulic torque wrench is usually calibrated by torque sensor connection: select the appropriate torque sensor according to the rated value of the torque wrench: the calibration method is as follows 6.2.4.5?). 3
HG707-2INL3
Use torque sensor at the input end and extension sensor at the output end (see the schematic diagram attached). Connect the output end with the appropriate torque sensor. After installation, adjust the relative position of the torque sensor and torque sensor, and then install the selected calibration point. Use the torque sensor to gradually and steadily apply torque to the torque wrench until the value is detected. Perform the calibration process for each point? times, according to 6.2. 4.5) Calibration method: 1) Inspection of electric and pneumatic torque sensors (excluding electric and pneumatic torque sensors with impact test) For electric and pneumatic torque sensors, the power supply should be guaranteed to be stable. During calibration, the torque sensor should be rotated at the same time and no rotation phenomenon is allowed. The calibration can be carried out according to the technical requirements of pneumatic or electric torque sensors. Non-rotating torque sensors should be used, and buffers and torque sensors should be selected. During calibration, the torque wrenches and impactors should be selected. The inspection should be carried out according to 6.2.4.5a). 2) Rotating torque sensors should be selected, and each pair of fixed torque sensors should be in a loose state. During inspection, the torque wrench is matched with the sensor, and the plate joint and the sensor are required to be connected online. The inspection is carried out according to 6.2.4.5. 6.2.4.6 Calculation of relative error and repeatability of indication a) Based on the indication of the torque wrench, when reading on the standard device, calculate the relative error and repeatability of indication according to formulas (1) and (2): Relative error of indication
Relative error of indication
Where:
×100%
M,rw Mjmin
×100%
, the indicated value of each fixed point, Nm—the arithmetic mean of the three indicated values of the standard device at each calibration point, m; (1)
.mstart—the maximum and minimum values of the three minimum values of the calibration user standard device at the normal point, Nm1h is based on the standard value of the European standard device. When selecting the indicated value on the torque wrench, use formula (3) and (4) to calculate the relative error of the indicated value: the relative error of the indicated value
is calculated by the left
formula;
M×100%
m - 100%
, — the arithmetic mean of the three indications at each calibration point, Nm; — the standard torque value of the standard device at each calibration point, Nin(3)
the maximum and minimum values of the three indications of the torque point in the calibration, Nin(4). ) Based on the standard value of the force arm method weight device, when the torque value is obtained at the maximum value, the relative error of the indication and the repeatability of the indication are calculated according to formulas (5) and (6): Relative error of indication
Repeatability of indication
×1CK)%
Where:
H:TOT—2U3
, the arithmetic half-mean of the three indications of the torque at each calibration point, Ym; standard torque value of the force arm method weight device, NrL is Length (m): F is the maximum and minimum value of the three indications of the torque wrench at the first point in the calibration (N)
, Nm) When calibrating a torque wrench with a torque amplifier, the torque of the torque wrench is used as the basis. The torque sensor reading at the output end is used to calculate the relative error and repeatability of the indication according to () and (8): Relative error of indication
Repeatability of indication
Where:
f.rt Hf.nwww.bzxz.net
K-torque multiplier:
-torque value of the torque wrench at each calibration point, Nm--the semi-average of the three torque values of the output end torque sensor at the calibration point, NmfMmn
6.3 Calibration result processing
The torque wrench measures the maximum and minimum torque values of the output end torque sensor at the calibration point, Nme
A calibration certificate will be issued to the torque wrench that passes the calibration, and a calibration result notice will be issued to the torque wrench that fails the calibration and the unqualified requirements will be noted.
6.4 Calibration cycle
The calibration cycle of torque transducers is generally not more than one year, 5
Appendix
JTG 70—2003
Working principle diagram of arm code calibration device
Force factor
Torsion bar
Force code
Working principle diagram of torque transducer calibration device
Appendix B
JJG 707—2403
Working principle diagram of torque sensor calibration device, vibrator+
Torsion bar
Figure R. Working principle diagram of torque transducer calibration device Appendix C
JJG 707—2003
Working principle of torque wrench test device with torque multiplier
Batch torque multiplier
Special torque sensor
Figure 1 Working principle of torque wrench test device with torque multiplier5) Calibration method: 1) Inspection of electric and pneumatic torque sensors (excluding electric and pneumatic torque sensors with impact test) For electric and pneumatic torque sensors, the power supply should be guaranteed to be stable. During calibration, the torque sensor should be rotated at the same time and no rotation phenomenon is allowed. The calibration can be carried out according to the technical requirements of pneumatic or electric torque sensors. Non-rotating torque sensors should be used, and buffers and torque sensors should be selected. During calibration, the torque wrenches and impactors should be selected. The inspection should be carried out according to 6.2.4.5a). 2) Rotating torque sensors should be selected, and each pair of fixed torque sensors should be in a loose state. During inspection, the torque wrench is matched with the sensor, and the plate joint and the sensor are required to be connected online. The inspection is carried out according to 6.2.4.5. 6.2.4.6 Calculation of relative error and repeatability of indication a) Based on the indication of the torque wrench, when reading on the standard device, calculate the relative error and repeatability of indication according to formulas (1) and (2): Relative error of indication
Relative error of indication
Where:
×100%
M,rw Mjmin
×100%
, the indicated value of each fixed point, Nm—the arithmetic mean of the three indicated values of the standard device at each calibration point, m; (1)
.mstart—the maximum and minimum values of the three minimum values of the calibration user standard device at the normal point, Nm1h is based on the standard value of the European standard device. When selecting the indicated value on the torque wrench, use formula (3) and (4) to calculate the relative error of the indicated value: the relative error of the indicated value
is calculated by the left
formula;
M×100%
m - 100%
, — the arithmetic mean of the three indications at each calibration point, Nm; — the standard torque value of the standard device at each calibration point, Nin(3)
the maximum and minimum values of the three indications of the torque point in the calibration, Nin(4). ) Based on the standard value of the force arm method weight device, when the torque value is obtained at the maximum value, the relative error of the indication and the repeatability of the indication are calculated according to formulas (5) and (6): Relative error of indication
Repeatability of indication
×1CK)%
Where:
H:TOT—2U3
, the arithmetic half-mean of the three indications of the torque at each calibration point, Ym; standard torque value of the force arm method weight device, NrL is Length (m): F is the maximum and minimum value of the three indications of the torque wrench at the first point in the calibration (N)
, Nm) When calibrating a torque wrench with a torque amplifier, the torque of the torque wrench is used as the basis. The torque sensor reading at the output end is used to calculate the relative error and repeatability of the indication according to () and (8): Relative error of indication
Repeatability of indication
Where:
f.rt Hf.n
K-torque multiplier:
-torque value of the torque wrench at each calibration point, Nm--the semi-average of the three torque values of the output end torque sensor at the calibration point, NmfMmn
6.3 Calibration result processing
The torque wrench measures the maximum and minimum torque values of the output end torque sensor at the calibration point, Nme
A calibration certificate will be issued to the torque wrench that passes the calibration, and a calibration result notice will be issued to the torque wrench that fails the calibration and the unqualified requirements will be noted.
6.4 Calibration cycle
The calibration cycle of torque transducers is generally not more than one year, 5
Appendix
JTG 70—2003
Working principle diagram of arm code calibration device
Force factor
Torsion bar
Force code
Working principle diagram of torque transducer calibration device
Appendix B
JJG 707—2403
Working principle diagram of torque sensor calibration device, vibrator+
Torsion bar
Figure R. Working principle diagram of torque transducer calibration device Appendix C
JJG 707—2003
Working principle of torque wrench test device with torque multiplier
Batch torque multiplier
Special torque sensor
Figure 1 Working principle of torque wrench test device with torque multiplier5) Calibration method: 1) Inspection of electric and pneumatic torque sensors (excluding electric and pneumatic torque sensors with impact test) For electric and pneumatic torque sensors, the power supply should be guaranteed to be stable. During calibration, the torque sensor should be rotated at the same time and no rotation phenomenon is allowed. The calibration can be carried out according to the technical requirements of pneumatic or electric torque sensors. Non-rotating torque sensors should be used, and buffers and torque sensors should be selected. During calibration, the torque wrenches and impactors should be selected. The inspection should be carried out according to 6.2.4.5a). 2) Rotating torque sensors should be selected, and each pair of fixed torque sensors should be in a loose state. During inspection, the torque wrench is matched with the sensor, and the plate joint and the sensor are required to be connected online. The inspection is carried out according to 6.2.4.5. 6.2.4.6 Calculation of relative error and repeatability of indication a) Based on the indication of the torque wrench, when reading on the standard device, calculate the relative error and repeatability of indication according to formulas (1) and (2): Relative error of indication
Relative error of indication
Where:
×100%
M,rw Mjmin
×100%
, the indicated value of each fixed point, Nm—the arithmetic mean of the three indicated values of the standard device at each calibration point, m; (1)
.mstart—the maximum and minimum values of the three minimum values of the calibration user standard device at the normal point, Nm1h is based on the standard value of the European standard device. When selecting the indicated value on the torque wrench, use formula (3) and (4) to calculate the relative error of the indicated value: the relative error of the indicated value
is calculated by the left
formula;
M×100%
m - 100%
, — the arithmetic mean of the three indications at each calibration point, Nm; — the standard torque value of the standard device at each calibration point, Nin(3)
the maximum and minimum values of the three indications of the torque point in the calibration, Nin(4). ) Based on the standard value of the force arm method weight device, when the torque value is obtained at the maximum value, the relative error of the indication and the repeatability of the indication are calculated according to formulas (5) and (6): Relative error of indication
Repeatability of indication
×1CK)%
Where:
H:TOT—2U3
, the arithmetic half-mean of the three indications of the torque at each calibration point, Ym; standard torque value of the force arm method weight device, NrL is Length (m): F is the maximum and minimum value of the three indications of the torque wrench at the first point in the calibration (N)
, Nm) When calibrating a torque wrench with a torque amplifier, the torque of the torque wrench is used as the basis. The torque sensor reading at the output end is used to calculate the relative error and repeatability of the indication according to () and (8): Relative error of indication
Repeatability of indication
Where:
f.rt Hf.n
K-torque multiplier:
-torque value of the torque wrench at each calibration point, Nm--the semi-average of the three torque values of the output end torque sensor at the calibration point, NmfMmn
6.3 Calibration result processing
The torque wrench measures the maximum and minimum torque values of the output end torque sensor at the calibration point, Nme
A calibration certificate will be issued to the torque wrench that passes the calibration, and a calibration result notice will be issued to the torque wrench that fails the calibration and the unqualified requirements will be noted.
6.4 Calibration cycle
The calibration cycle of torque transducers is generally not more than one year, 5
Appendix
JTG 70—2003
Working principle diagram of arm code calibration device
Force factor
Torsion bar
Force code
Working principle diagram of torque transducer calibration device
Appendix B
JJG 707—2403
Working principle diagram of torque sensor calibration device, vibrator+
Torsion bar
Figure R. Working principle diagram of torque transducer calibration device Appendix C
JJG 707—2003
Working principle of torque wrench test device with torque multiplier
Batch torque multiplier
Special torque sensor
Figure 1 Working principle of torque wrench test device with torque multiplier
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