Search result: TCSAE137-2020
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Water proof test and assessment methods for automotive fastening joints
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T/CSAE 137-2020
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| Standard ID | T/CSAE 137-2020 (T/CSAE137-2020) | | Description (Translated English) | Water proof test and assessment methods for automotive fastening joints | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | T40 | | Word Count Estimation | 12,156 | | Date of Issue | 29/5/2020 | | Date of Implementation | 29/5/2020 | | Issuing agency(ies) | Chinese Society of Automotive Engineering |
TC SAE137-2020
T/CSAE 137-2020
Water proof test and assessment methods for automotive fastening joints
ICS 43.020
T 40
Group standard
Test and evaluation method for waterproof and sealing performance of automobile fastening points
2020-05-29 released
2020-05-29 Implementation
Issued by Chinese Society of Automotive Engineering
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Waterproof sealing grade of fastening point...2
4.1 Waterproof sealing grade FS code...2
4.2 FS Waterproof Seal Grade Description...2
5 Waterproof sealing test method...3
5.1 General requirements of the test environment...3
5.2 Preparation of Fastening Point Samples...3
5.3 Test method of oscillating tube...3
5.4 Spray nozzle test method...4
5.5 Test method for water jet nozzle and water gun...4
5.6 Immersion test method...4
6 Evaluation of test results...4
7 Special requirements...4
8 Test report...5
Appendix A (Normative Appendix) Schematic Diagram of Oscillation Tube Test Device...6
Appendix B (Normative Appendix) Schematic diagram of spray nozzle testing device...7
Appendix C (Normative appendix) Schematic diagram of water hose nozzle test device...8
Preface
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that certain contents of this document may involve patents, and the issuing agency of this document does not bear the responsibility for identifying these patents.
This standard was proposed by the Automobile Anti-Corrosion and Aging Branch of the Chinese Society of Automotive Engineering.
Drafting organizations of this standard. Pan Asia Automotive Technology Center Co., Ltd., Shanghai Automotive Group Co., Ltd. Passenger Vehicle Branch, Shanghai Automobile
Commercial Vehicle Technology Center of Automobile Group Co., Ltd., Chinese Express (Jiangsu) Technology Co., Ltd., Chongqing Changan Automobile Co., Ltd.,
Qoros Automobile Co., Ltd., SAIC Volkswagen Co., Ltd., Tianji Automobile Technology Group Co., Ltd., Beijing Automotive Group Off-road Vehicle Co., Ltd.
Company, Shanghai Weilai Automobile Co., Ltd., Crown Standard (Shanghai) Testing Technology Co., Ltd., Anti-fall Screw (Kunshan) Co., Ltd., Shanghai Nat
Automotive Standard Parts Co., Ltd., Shanghai Qiuming Standard Parts Co., Ltd., Yingfeng Fastening System (Wuxi) Co., Ltd., Shanghai Yigong Plastic Hardware
Co., Ltd., Jiangsu Huasheng Fastener Manufacturing Co., Ltd., Tmax Fastener System (Suzhou) Co., Ltd.
The main drafters of this standard. Shi Tianyin, Ye You, Zhou Fei, Jiang Zhuoshi, Gu Xiaogang, Zhou Lin, Zhang Binjie, Liu Huadong, Yu Yong, Yi Chao
Yun, Li Guikang, Kang Liugen, Chen Xin, Luan Jianxin, Zhao Fengyuan, Ning Wentao, Guo Liaosheng, Xiao Shengyuan, Lu Yejun, Yang Ping, Liu Lei, Zhu Ji
Yu, Li Zhilin, Wei Shijie, Chen Xiaohua, Zhang Daowu.
Test and evaluation method for waterproof and sealing performance of automobile fastening points
1 Scope
This standard specifies the waterproof sealing performance level, test methods, evaluation of test results and special requirements.
This standard is applicable to the general waterproof sealing performance test and evaluation of automobile fastening points.
This standard does not apply to air tightness testing.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
IEC 60529 enclosure protection level (IP Code) (Degrees of protection provided by enclosures (IP Code))
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Joints
A connection system consisting of one or more fasteners and the fastened parts connected to them.
3.2
Water proof level
Waterproof seal level refers to the ability level to prevent water from passing through one side of the fastening point and entering the other side of the component. The higher the level, the waterproof seal of the fastening point
The stronger the ability. The waterproof seal level is for the fastening point, not just for the fastener.
3.3
Wet side
According to the design requirements of the whole vehicle, the water side of the fastening point is allowed.
3.4
Dry side
According to the vehicle design requirements, the fastening point is not allowed on the side with water.
3.5
Discharge of water
The volume of water flowing through a certain interface per unit time.
4 Waterproof sealing grade of fastening point
4.1 Waterproof sealing grade FS code
See Figure 1 for the FS code of the waterproof seal class. If there are other requirements for waterproof and sealing performance, it can be determined through negotiation between the supplier and the buyer.
The letter X is added after the waterproof seal code, and other specific performance requirements represented by X are indicated at the same time. Please refer to Chapter 7.
4.2 FS Waterproof Sealing Grade Description
See Table 1 for the description of FS waterproof sealing grade and corresponding test method.
5 Waterproof sealing test method
5.1 General requirements of the test environment
Unless there are other definitions in the corresponding product drawings, the recommended test environment is as follows.
--Ambient temperature. 15 oC～35 oC;
--Relative humidity. 25% RH～75% RH;
--Atmospheric pressure. 86 kPa～106 kPa;
--Test water. meet GB/T 6682 grade three water or above;
--Test water temperature. If there is no special requirement, the water temperature range is 15 oC～35 oC.
5.2 Sample preparation for fastening spot
According to the connection method required by the actual component design, all the fastened components and fasteners are assembled and connected to form a fastening point. For being
Fastening parts can be cut to a suitable size and then fastened and assembled; the same material and surface condition of the fastened part can also be used.
Plate replacement, but must ensure that the assembly interface is the same as the original design, and does not change the force state of the connection pair when the original component is assembled.
The specific requirements for sample preparation of fastening points are as follows.
a) For the three types of tests of oscillating tube, shower nozzle, water jet nozzle and water gun, make samples of fastening points according to the following requirements.
Fix the assembled fastening points on the top surface of the hole, the bottom of which can be opened, and the other four sides of the closed square box. Wet side of fastening point outwards,
Dry facing inward. The fastening point should completely cover the opening on the top surface of the square box and the edges should fit on the surface of the square box. The fastener should be located at the center of the opening, and
Use waterproof tape or other sealing methods to seal around the fastening points and the top surface of the square box. The sealing method shall not affect the fastening points.
1) Before fixing the fastening point, you can place a color test paper on the dry side of the fastening point to help evaluate the results after the test;
2) The reference size of the square box. (length) 25 mm × (width) 250 mm × (height) 100 mm (adjustable according to the size of the fastening point);
3) The reference size of the opening on the top surface of the square box. a round hole with a diameter of 50 mm (can be adjusted according to the size of the fastening point);
b) For the underwater immersion test, the fastening point samples are prepared according to the following requirements.
The assembled fastening point is fixed to the bottom of a container with an open bottom, and the bottom of the container can be used to hold water and measure the water surface height after being closed.
The dry side of the fastening point is downward, and the surroundings of the fastening point and the bottom surface of the container are sealed with waterproof tape or other sealing methods.
You can place a water-changing test paper on the dry side of the fastening point to help evaluate the results after the test.
5.3 Test method of oscillating tube
The test method of the oscillating tube is as follows.
a) Use the oscillating tube test device shown in Appendix A. The oscillating tube is provided with spray holes at 60 degrees on both sides of the midpoint, and the support is not drilled;
b) The square box with fastening points for sample preparation is placed at the center of the semicircle and firmly fixed, with the top surface of the opening facing up. Pipe through a
Oscillation at an angle of 120 degrees, 60 degrees on each side of the vertical direction, the use time of a complete oscillation period (2×120 degrees) is approximately
4 seconds. The test duration is 5 minutes;
c) Then turn the fastening point box that has completed the sample preparation to a 90-degree horizontal corner and continue the test for 5 minutes. Oscillating tube most
The maximum acceptable radius is 1600 mm;
d) The total water flow rate is as listed in Table 2 and measured with a flow meter;
e) The average water flow rate qvl=0.07L/min±10%.
5.4 Spray nozzle test method
Use the spray nozzle test device shown in Appendix B. During the test, the compensation plate is placed in an appropriate position to ensure that the water flow can cover the entire fastening point.
The square box with fastening points for sample preparation is placed in a suitable way and firmly fixed, with the top surface of the opening facing up, and the nozzle distance from the fastening point at 300 mm～
Between 500 mm.
Adjust the water pressure to give the specified water flow rate of 10 liters/min ± 10%, and the water pressure to reach this flow rate should be 50 kPa~
150 kPa, the water pressure should be kept constant during the test.
Spray from the vertical direction to plus or minus 60 degrees, and the test duration is 5 minutes.
5.5 Test method of water jet nozzle
Use the nozzle with an inner diameter of 6.3 mm for the outlet shown in Appendix C for testing.
The square box with fastening points for sample preparation is placed and firmly fixed in a suitable manner, with the top surface of the opening facing upward.
The test conditions are as follows.
--The inner diameter of the nozzle. 6.3 mm;
--Flow rate. 12.5 liters/min ±5%;
--Water pressure. adjusted to provide the specified flow rate;
--The actual size of the water column. at a distance of about 2.5 meters from the nozzle, the diameter of the water column is about 40 mm;
--Minimum test duration. 3 minutes;
--The distance from the nozzle to the fastening point of the sample. between 2.5 meters and 3 meters.
5.6 Immersion test method
Soak the fastening point to a certain depth under the water surface and keep it for a certain time. The distance between the fastening point and the water surface and the holding time are according to customer requirements.
6 Evaluation of test results
Immediately after the end of the test, remove the fastening point and observe whether there is any trace of water leakage on the dry surface. If no trace of water leakage is observed, the test is determined
Pass, otherwise the test fails.
7 Special requirements
According to the requirements of the buyer and after negotiation between the supplier and the buyer, the following special requirements can be added.
a) For FS3 level, specify the depth of the fastening point from the water surface and the immersion retention time;
b) For the fastening points, the fasteners are required to be assembled for multiple times before the waterproof test is carried out. The number of assembly times is defined by the supplier and the buyer through negotiation;
c) For the fastening point, it is required to undergo a temperature cycle before performing a waterproof test. The specific temperature cycle requirements are defined by the supplier and the buyer through consultation;
d) Other special requirements.
8 Test report
The test report shall record the following contents, and other unlisted contents can also be added to the test report after negotiation between the supplier and the buyer.
--Sample name and number;
--Test photos before and after the experiment;
-Explain that the test is carried out according to this standard;
-Test date;
--Waterproof sealing grade and test method used;
--Water temperature and sealing method;
--The depth and holding time under the water surface (if the immersion test method is selected);
- Test result. passed or failed;
--Whether the discoloration test paper is discolored in water (if used);
- Abnormal conditions in the test.
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