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GBZ13672-2022: Test method for scuffing load capacity of gears
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Basic data | Standard ID | GB/Z 13672-2022 (GB/Z13672-2022) | | Description (Translated English) | Test method for scuffing load capacity of gears | | Sector / Industry | National Standard | | Classification of Chinese Standard | J17 | | Classification of International Standard | 21.200 | | Word Count Estimation | 26,284 | | Date of Issue | 2022-10-14 | | Date of Implementation | 2022-10-12 | | Older Standard (superseded by this standard) | GB/T 13672-1992 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GBZ13672-2022: Test method for scuffing load capacity of gears---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.
GB /Z13672-2022
Test method for scuffing load capacity of gears
ICS 21.200
CCSJ17
National Standardization Guidance Technical Document of the People's Republic of China
Replacing GB/T 13672-1992
Test method for bearing capacity of gear bonding
Released on 2022-10-12
2022-10-12 Implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 symbols 2
5 Test purpose 3
5.1 Test oil bonding capacity 3
5.2 Comparison of gear bonding capacity 3
6 Test equipment 4
6.1 Testing machine 4
6.2 Test gear 6
6.3 Lubricants 6
6.4 Timer and revolution counter 7
6.5 Test gear handling tools 7
6.6 Mineral spirits 7
7 Test Category 7
7.1 Routine test method 7
7.2 Special test method 7
7.3 Load spectrum test method 7
7.4 Step-by-step test method 7
7.5 Double-sided test method 7
8 Failure evaluation of test gears 8
8.1 Test oil bonding capacity 8
8.2 Comparison of gear bonding capacity 8
9 Test steps 10
9.1 Test preparation 10
9.2 Test oil bonding capacity 11
9.3 Comparison of gear bonding capacity 12
9.4 Unconventional event handling 13
10 Test report 13
Appendix A (Normative) Main technical performance of CL-100 gear testing machine 14
Appendix B (informative) Calibration of CL-100 gear testing machine 16
Appendix C (Normative) Parameters of Type "A" Test Gears 18
Appendix D (Informative) Adhesive Test Record 20
foreword
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 replaces GB/T 13672-1992 "Test Method for Bearing Capacity of Gear Bonding". Compared with GB/T 13672-1992, except
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The description of the scope of application has been changed, and it is clarified that the test method includes two aspects, that is, "different lubricating oils under specific test conditions
The test method is based on the test gear's glued bearing capacity, and the comparison of the glued bearing capacity of different gears under the same test conditions
Method" (see Chapter 1, Chapter 1 of the.1992 edition);
b) Added terms and definitions (see Chapter 3);
c) The symbols and descriptions have been changed (see Chapter 4, Chapter 3 of the.1992 edition);
d) The purpose of the test has been added (see Chapter 5);
e) The test machine requirements for the comparison of gear bonding capacity are added (see 6.1.2);
f) Added the formula for calculating the test parameters of the comparison gear bonding capacity [see formula (1) and formula (2)];
g) Changed the requirements for the use of lubricating oil (see 6.3, 5.3 of the.1992 edition);
h) Added the test types for comparison of gear bonding capacity (see 7.3, 7.4 and 7.5);
i) Increased the failure evaluation of the gear bonding capacity compared to that (see 8.2);
j) Added the test steps for comparison of gear bonding capacity and handling of unconventional events (see 9.3 and 9.4).
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Gear Standardization Technical Committee (SAC/TC52).
This document is drafted by. Zhengzhou Machinery Research Institute Co., Ltd., Shaanxi Fast Gear Co., Ltd., Nanjing High Precision Gear Group Co., Ltd.
Co., Ltd., Hebei University of Technology, CITIC Heavy Industry Machinery Co., Ltd., China Machinery Productivity Promotion Center, Suote Transmission Equipment Co., Ltd.,
Research on Hunan Desheng Intelligent Technology Co., Ltd., Northwestern Polytechnical University, Hunan Panco Transmission Technology Co., Ltd., and power industry product quality standards
Co., Ltd., Zhejiang Feng'an Gear Co., Ltd., Dongguan Xinghuo Gear Co., Ltd., China Aviation Development Zhongchuan Machinery Co., Ltd., Henan
Mechanical and Electrical Vocational College.
The main drafters of this document. Liu Yi, Wang Zhigang, Wu Mingjun, Chen Yong, Qu Tie, Li Haixia, Li Jinfeng, Wei Fude, Yan Shidang, Hou Shengwen,
Zhang Lei, Wang Haiwei, Zhou Changjiang, Hu Bo, Ma Rubo, Hong Xinyang, Tong Aijun, Tu Demin, Dong Fan, Yang Chao, Qi Wenzheng, Wang Peng, Gong Yu, Liu Geng,
Ren Jihua, Zhang Xinwei, Li Jiqiang, Gao Jianping, Ren Guanlin, Pu Qiulin, Dai Yong.
This document was first published in.1992, and this is the first revision.
Test method for bearing capacity of gear bonding
1 Scope
This document specifies the test method for the bonding load capacity of different lubricating oils on the test gear under specific test conditions, and the test method for the same test
The comparison method of the gluing bearing capacity of different gears under different conditions, including test purpose, test equipment, test type, failure evaluation, test procedure
and test reports.
This document applies to the heat caused by the rupture of the lubricating oil film on the tooth surface due to the high temperature caused by the load and the sliding of the tooth surface under the condition of oil lubrication.
Glue damage test.
This document does not apply to the low tooth surface sliding speed caused by too high pressure on the tooth surface, severe partial load or insufficient lubrication, etc.
of cold gluing.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
GB/T 1356 Standard basic rack tooth profiles for cylindrical gears for general machinery and heavy machinery
GB 1922-2006 Solvent oil for paint and cleaning
GB/T 2821 Geometric element codes of gears
GB/T 3374.1 Gear Terms and Definitions Part 1.Geometric Definitions
GB/T 3480.1-2019 Calculation of load carrying capacity of spur and helical gears Part 1.Basic principles, overview and general influence coefficients
GB/T 3480.2-2021 Calculation of load carrying capacity of spur gears and helical gears Part 2.Calculation of tooth surface contact strength (pitting)
GB/T 10095 (all parts) Cylindrical gear precision system
GB/T 19936.1-2005 FZG test procedure for gears Part 1.FZG test method for relative bonding capacity of oil products
Law A/8.3/90
3 Terms and Definitions
The following terms and definitions defined in GB/T 2821 and GB/T 3374.1 apply to this document.
3.1
glued scuffing
Damage caused by adhesive wear on the gear meshing surfaces in the sliding direction.
Note 1.Gluing is the migration of material on the same tooth surface or different tooth surfaces due to severe adhesion, or material loss due to welding and tearing.
Note 2.Typical tooth surface gluing generally occurs under high temperature, high pressure or high relative sliding speed, etc., due to the lack of lubricating oil film between the meshing tooth surfaces
or damage caused.
Note 3.Abrasion is classified as abrasive wear, not gluing.
3.2
Under the test conditions of the specified device, the maximum load that the lubricating oil can withstand against gear sticking.
5 Purpose of the test
5.1 Test oil bonding capacity
Under the specified test conditions, the standard test gear made of specific parameters, specific materials and specific processes is loaded and operated, and the test is passed.
Gear failure, test and study the bonding capacity of different oils.
5.2 Comparison of bearing capacity of gears
Follow the principle of single variable, under different oil products and lubrication methods, use different materials, different processing techniques or different tooth shapes and other conditions
The comparison test gear is loaded and operated, through the failure of the test gear, the anti-adhesion bearing of the comparison test gear under the same conditions is compared and studied
load capacity. The comparison content of test gears includes but not limited to.
---Material;
--- heat treatment;
---Final processing method. machining process (grinding, shaving, ultra-finishing, etc.), surface treatment (phosphating, copper plating, silver plating, etc., thermal spraying, etc.),
Surface strengthening (shot peening, etc.);
---Process flow;
---Geometric parameters;
--- tooth surface modification;
---Operating temperature;
--- Pitch circle linear speed.
6 Test equipment
6.1 Testing machine
6.1.1 Used to test the bonding capacity of oil products
6.1.1.1 Structure and function
The CL-100 gear testing machine (or the test device that can cover all the technical requirements of the CL-100 gear testing machine) in Appendix A should be used.
setting), see Appendix B for testing machine calibration requirements.
6.1.1.2 Load class
The loading setting of the testing machine should include 12 load levels (corresponding to the given calculated contact stress of 146N/mm2~1841N/mm2),
And meet the requirements of Table 2.
6.1.2 For comparison of gear cementing load capacity
6.1.2.1 Structure and function
The main structure is similar to CL-100 gear testing machine. The loading of the testing machine can adopt other controllable methods (such as hydraulic loading, etc.), in addition
The following requirements should be met.
---The drive motor power is not less than 5.5kW;
---It can automatically stop when serious glueing or abnormality occurs during the test;
---Have a heating and cooling device to control the temperature of the test oil.
At the same time, the following requirements should be met.
The above Kv, KHα and KHβ should be selected or calculated according to Chapter 6, Chapter 8 and Chapter 7 of GB/T 3480.1-2019 respectively,
ZH, ZE, Zε, Zβ, ZB shall be selected or calculated according to 6.2, Chapters 7~9 and 6.3~6.4 of GB/T 3480.2-2021 respectively.
6.2 Test gear
6.2.1 For the test of the bearing capacity of oil bonding, the test gear parameters ("A" type) should comply with the provisions of Appendix C.
6.2.2 For the comparison of gear bonding capacity, two or more groups of test gears should be compared with a single variable, and other conditions other than variables
All should be consistent, and the following requirements must also be met.
a) The test gear can be similarly designed according to the product gear parameters and actual operating conditions, but the center distance should meet the test machine (or gear
Box) requirements, when designing parameters, care should be taken to avoid pitting corrosion, broken teeth and other failures in the test in advance;
b) Variables that can be selected for the test gear include but are not limited to. tooth profile parameters (such as tooth profile angle, deformation coefficient, slip ratio, modification method, modification method, etc.)
Quantity), material, molding, heat treatment, machining, surface treatment and technological process, etc.;
c) The test gears in the same group should be completed with the same material, same process and same batch, and have necessary process records;
d) The test gear should have the same technical parameters as the test gear, and avoid self-failure by increasing the tooth width.
Warning. The diversity of test gear parameters and other test conditions may cause uncertainty in the test results, that is, for the purpose of gluing
Pitting corrosion, fracture and other failures may occur first in the test, resulting in test failure or even equipment damage. Therefore, the design of the experiment should take into account
Comprehensive, the process of the test should be closely monitored.
6.2.3 Before the test, the machining accuracy of the test gear and the roughness, hardness, and burns of the tooth surface should be checked and checked.
6.2.4 When using the test results of 7.1 and 7.2 for arbitration, a pair of test gears can only be used once. When carrying out the provisions of 7.3 or 7.4
During the test, if the test purpose and test conditions are the same, each pair of test gears can be used twice, that is, the left and right tooth surfaces of the same tooth can be used once.
6.3 Lubricating oil
The lubricating oil used for the test shall be consistent with the specified oil in the gearbox design document, or shall be selected by the tester (if necessary, it shall be consulted with the entrusting party)
negotiation).
6.4 Timer and tachometer
It is used to display and control the number of revolutions of the test gear during each stage of the test, and the motor power supply should be automatically cut off after each stage of the test.
6.5 Test gear handling tools
Including but not limited to heating boxes, hydraulic or mechanical pullers, etc., it should be ensured that the test gear will not damage itself and the testing machine during loading and unloading.
6.6 Solvent oil
For cleaning test gears. It should meet the requirements of No. 2 oil in GB 1922-2006, or replace it with unused gasoline.
7 test categories
7.1 Routine test method
In the test of oil bonding bearing capacity, use CL-100 testing machine or similar testing machine, "A" type test gear,
The test is carried out under the condition that the circular linear velocity is 8.3m/s and the initial oil temperature is 90°C±3°C (the test condition code is A/8.3/90). Other try
The test conditions shall comply with the provisions in Table 4 of GB/T 19936.1-2005.
7.2 Special test method
In the test of oil bonding bearing capacity, the test conditions in 7.1 should be changed as needed. There are two main types of changes.
a) Change the pitch circle linear velocity of the test gear. If the test condition code is A/16.6/90, the "A" type test gear is used, the gear section
The circular velocity is 16.6m/s, and the initial oil temperature is 90℃±3℃.
b) Change the initial oil temperature of the test. If the test condition codes are A/8.3/60, A/8.3/110 and A/8.3/140, the "A" type test
The gear is tested, and the pitch circle velocity of the gear is 8.3m/s, and the initial oil temperature is 60°C±3°C, 110°C±3°C and 140°C±3°C, respectively.
7.3 Load spectrum test method
In the comparison test of gear bonding capacity, the test gear is placed under given installation and lubrication conditions. according to actual needs
The load spectrum (or steady load) is used for loading bonding tests. Record the number of load spectrum (or steady load) cycles where gluing occurs, and compare the two test
The tooth surface of the inspection gear is inspected and evaluated.
7.4 Step-by-step test method
In the comparison test of gear bonding capacity, the test gear is placed under given installation and lubrication conditions. The highest test load level
It is grade 22, and the highest contact stress is 3357N/mm2.According to Table 3, the tooth surface is loaded step by step. When the speed of the large gear is 1450r/min
Under certain circumstances, the test gear runs at a steady speed for 15 minutes for each additional level of load (it is allowed to increase the speed of the large gear and reduce the running time of the gear accordingly).
Starting from the fifth level of load, control the initial oil temperature not to exceed ±3°C of the given value, and allow the oil temperature to rise freely during the running test of each level of load.
7.5 Double-sided test method
In the comparison test of gear bonding capacity, one tooth surface of the test gear should be tested according to 7.4 first, and then according to the test
The situation proceeds as follows.
--- If the gear is not glued and fails at the highest load level set by the tester, then use the highest load level to test the other tooth of the gear
Carry out the gluing test on the surface of the test gear, record the number of stress cycles where gluing occurs, and check and compare the two tooth surfaces of the test gear
Evaluation;
--- If the gear gluing fails before the highest load level set by the tester, the other tooth of the test gear is tested at the failure load level
Carry out the gluing test on the surface of the test gear, record the number of stress cycles where gluing occurs, and check and compare the two tooth surfaces of the test gear
Evaluation.
8 Failure evaluation of test gear
8.1 Test oil bonding capacity
On pinion active flank areas with 16 teeth, the total glued damage width added up exceeds one tooth width
(20mm) is determined as the failure load level.
8.2 Comparison of the bearing capacity of the gear glued
After the end of each level of load operation or the specified number of cycles, the damage form and degree of damage on the tooth surface of the test gear can be compared
Observe by comparing Table 4 and Figures 1 to 10, and the adhesive bearing capacity of the gear should be based on the load level when the adhesive fails or the stress when the adhesive fails.
To determine the number of force cycles, specifically.
---If after running at a certain load level (for example, level 10), the tooth surface of the test gear has moderate or severe gluing damage, the load
Level (level 10) can be considered as the adhesive failure load level;
---If the tooth surface of the test gear has moderate or severe gluing damage after running under a certain stress, the stress of the last two unpacking
The average value of the number of cycles can be considered as the number of adhesive failure stress cycles, for example, after the 217,500th cycle, no teeth can be seen after unpacking
If the wheel is glued or only slightly glued, and after the 239250th cycle, moderate or severe glued damage is found on the tooth surface, then two
The average value of 228375 can be considered as the number of adhesive failure stress cycles under this stress.
9.1.3 Cleaning
9.1.3.1 Clean and dry a pair of unused test gears with solvent oil.
9.1.3.2 Check the test gear, the tooth surface must not have corrosion, rust or any other form of damage.
9.1.3.3 Thoroughly flush the test gearbox twice with unused solvent oil. When cleaning, solvent oil should be added above the axis, and then slowly cleaned by hand.
Turn the tester slowly to drain any remaining lubricant from the bearings. After cleaning, empty the solvent oil and dry the test gear box.
9.1.4 Installation
Appropriate tools should be used to install the test gear to ensure that no damage will be caused to the inner hole of the gear, the shaft of the test machine and other parts. Insurable
Verify that the position and direction of the large and small test gears are correct, and there is no stagnation in manual rotation.
9.2 Testing oil bonding capacity
9.2.1 Routine test method
9.2.1.1 Add the specified lubricating oil into the test gear box, so that the liquid level reaches the axis line, and the gears are in the state of oil bath lubrication.
9.2.1.2 Plug in the heater plug, install the top cover of the test gear box, and cover the protective cover of the test machine.
9.2.1.3 At the motor speed of about 1450r/min and the ambient temperature, apply the first-level load according to Table 2, turn on the power supply of the heater, and start the motor.
Motive, run for 15min.
9.2.1.4 Shut down the motor, apply the second-level load, and continue to run the starter motor for 15 minutes. Follow the same procedure for levels 3 and 4
load operation.
9.2.1.5 Starting from the fourth level of load, after the end of each level of load test, open the test gearbox, and visually inspect the damage of the tooth surface according to 8.1.if
When the failure load level is reached, stop the machine, take pictures of the glued failure gear, and record the position and size of the tooth surface damage in the test report;
When the bonding failure is reached, carry out the next level of load test according to Table 2.
9.2.1.6 Starting from the fifth level of load, the initial oil temperature of each level of load test should be controlled at 90°C±3°C.
9.2.1.7 During the specified running time, when the oil temperature exceeds 93°C, the temperature of the lubricating oil should be cooled to
90°C±3°C.
9.2.1.8 Increase the load on the tooth surface step by step, and continue the test until the tooth surface bonding fails. If the tooth flanks are still not glued when the load is increased to level 12
In case of failure, stop the test, and indicate in the test report that "the bonding failure load level exceeds level 12".
9.2.1.9 During the test, when the tooth surface starts to glue together, the test noise increases, and white smoke appears in the test gearbox, etc. in test machine
In the case of normal rotation and test gear lubrication, stop the machine for inspection after the specified running time is completed.
9.2.1.10 After each stage of load operation, the oil temperature, torque and total revolutions of the motor shall be recorded.
9.2.1.11 After the test is finished, the load should be unloaded first, and then the gear should be unloaded.
9.2.2 Special test method
The test procedure is the same as 9.2.1, but some test conditions should be changed according to different requirements. Specifically.
--- For A/8.3/60, starting from the 5th level of load, the initial oil temperature of each level of load test should be controlled at 60 °C ± 3 °C, within the specified
During the running time, when the oil temperature exceeds 63°C, the temperature of the lubricating oil should be cooled to 60°C± before the next load test.
3°C;
--- For A/8.3/110, starting from the 5th level of load, the initial oil temperature of each level of load test should be controlled at 110°C ± 3°C.
During the specified running time, when the oil temperature exceeds 113°C, the temperature of the lubricating oil should be cooled to
110℃±3℃;
--- For A/8.3/140, starting from the 5th level of load, the initial oil temperature of each level of load test should be controlled at 140°C ± 3°C.
During the specified running time, when the oil temperature exceeds 143°C, the temperature of the lubricating oil should be cooled to
140℃±3℃;
---For A/16.6/90, increase the gear pitch circle linear speed to 16.6m/s, and the running time of each load can be reduced to 7.5min.
9.3 Comparison of gear cementing load capacity
9.3.1 Load spectrum test method
9.3.1.1 According to the test lubrication requirements, adjust the test bench to the state of oil bath lubrication, oil injection lubrication, oil bath and oil injection lubrication, and lean oil lubrication.
A sort of.
9.3.1.2 Close the test gear box and cover the test machine protective cover.
9.3.1.3 Load the test bench with the torque and speed required by the actual load spectrum, and start the motor.
9.3.1.4 Pause the test after reaching the preset time (generally no more than 1h) or the number of cycles, open the test gear box, and visually inspect the tooth surface according to 8.2
In the case of damage, if moderate or severe gluing occurs (see Table 4 and Figures 6 to 10), stop the test and take pictures of the gluing failure gears.
Record the position and size of the tooth surface damage in the test report; if the adhesive failure is not reached, the next cycle load test should be carried out (start again
At the beginning of the motor test, a heater should be used to ensure that the oil temperature is the same as the oil temperature at the end of the previous test).
9.3.1.5 After the test is finished, the load should be unloaded first, and then the gear should be unloaded.
9.3.2 Step-by-step test method
9.3.2.1 According to the test lubrication requirements, adjust the test bench to the state of oil bath lubrication, oil injection lubrication, oil bath and oil injection lubrication, and lean oil lubrication.
A sort of.
9.3.2.2 Plug in the heater plug, close the test gear box, and cover the test machine protective cover.
9.3.2.3 Apply the first-level load according to Table 3, turn on the power supply of the heater, start the motor, and run for 15 minutes.
9.3.2.4 Shut down the motor, apply the second-level load, and continue to run the starter motor for 15 minutes. Follow the same procedure for levels 3 and 4
load operation.
9.3.2.5 Starting from the fourth level of load, after the end of each level of load test, open the test gearbox, and visually inspect the damage of the tooth surface according to 8.2.
If moderate or severe gluing occurs (see Table 4 and Figures 6 to 10), stop the test, take pictures of the gluing failure gear, and record the gear in the test report.
The position and size of surface damage; if the failure of bonding is not achieved, then carry out the next level of load test according to Table 3.
9.3.2.6 Starting from the fifth level of load, the initial oil temperature of each level of load test should be controlled at 90°C±3°C.
9.3.2.7 During the specified operating time, when the oil temperature exceeds 93°C, the temperature of the lubricating oil pool should be cooled before carrying out the next level of load test.
Cool to 90°C±3°C.
9.3.2.8 Increase the load on the tooth surface step by step, and continue the test until the tooth surface bonding fails. If the tooth is loaded to the highest load level of this test
9.3.2.9 During the test, when the tooth surfaces start to glue together, the noise may increase and white smoke may appear in the test gear box. in test machine
In the case of normal rotation and test gear lubrication, stop the machine for inspection after the specified running time is completed.
9.3.2.10 After the test, the load should be unloaded first, and then the gear should be unloaded.
9.3.3 Double-sided test method
9.3.3.1 Test one tooth surface of the test gear according to 9.3.2 until the glue fails, or the highest load level of the test is reached (see
9.1.1).
9.3.3.2 Carry out a loading test on the other tooth surface of the test gear according to the conditions in 9.3.2 and the load level at the time of failure in 9.3.3.1;
9.3.3.1 After the test, if the tooth surface is still not glued and failed, then directly use the highest load level of the test gear for the subsequent test.
9.3.3.3 After the preset time or number of cycles is reached, suspend the test, open the test gearbox, and visually inspect the damage of the tooth surface according to 8.2, if
If moderate or severe gluing occurs (see Table 4 and Figure 6~Figure 10), stop the test, take pictures of the gluing failure gear, and record it in the test report
The location and size of tooth surface damage; if the adhesive failure is not reached, proceed to the next cycle load test (when starting the test again, use
The heater ensures that the oil temperature is the same as the oil temperature at the end of the previous test).
9.3.3.4 After the test, the load should be unloaded first, and then the gear should be unloaded.
9.4 Unconventional Event Handling
If the following situations occur in the comparison test of the gear bonding bearing capacity, corresponding measures should be taken.
--- When the shutdown is due to equipment or instrument failure, it is allowed to continue the test under the original test conditions after the failure is repaired;
--- When the load level is relatively low in the early stage of the test, but for some reason there is slight glueing, it is allowed to continue loading;
---When a certain link is missed in the test due to some reason (such as missing measurement or missing some data during the operation of a certain level of load), this test
The data in other links are still valid.
10 Test report
See Appendix D for the format of test records. Among them, see Table D.1 for the test records of oil bonding bearing capacity test.
See Table D.2 for specific test records. Test records should include the following.
b) test conditions;
c) Model and serial number of the testing machine;
d) The original inspection sheet for the parameters, materials, heat treatment, surface treatment and machining of the test gear;
e) Test gear number and working surface (left tooth surface or right tooth surface);
f) Type and brand of lubricating oil used in the test;
h) Record of glued tooth surface failure;
i) the name of the reporter;
j) name of reviewer;
k) test date;
l) Test unit.
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