When it comes to automotive electrical connector system performance standards, that is to comply with the USCAR-20 standard, USCAR-20 automotive connector must be safe and reliable throughout the life cycle, so as to provide users with basic safety performance. With the development of the car more and more tend to be multi-functional, intelligent, the design of the car connector is also facing more and more difficult, so the car connector in the seal test, must pass the corresponding seal test to pass, then you know what is the seal test of the car connector?
Part1. Sealing test
It is required to test the tightness of the connector under vacuum or positive pressure. Generally, it is required to seal the product with a fixture under positive pressure or negative pressure of 10kPa to 50kPa. Test products with leakage rate less than 1cc/min or with higher requirement less than 0.5cc/min are qualified products.
Part2. Pressure test
Pressure test can be divided into negative pressure test and positive pressure test. The test requires the selection of precise proportional control valve set, from the initial pressure 0 value in accordance with a certain vacuum rate to vacuum the product, vacuum time and vacuum degree of the proportion of the requirements can be adjusted. For example, set the vacuum extraction to -50kPa and the extraction rate is 10kPa /min. The difficulty in this test is that the tightness tester or leak detector is required to be able to set the starting pressure for the extraction of negative pressure value, such as starting from 0, of course, it can also be required to start from -10kPa, and the extraction rate can also be set, and can be changed. As we all know, the sealing tester or the air tightness detector is equipped with manual or electronic pressure regulating valve, which can only be adjusted according to the set pressure. Initial pressure started from zero, the ability of the vacuum generated by the vacuum source (vacuum generator or vacuum pump), vacuum after vacuum source through the pressure regulating valve is fixed, the speed of the instant pressure extraction is only from 0 to fixed pressure regulator set pressure, do not have control the extraction pressure and the ability to time into different ratios. The principle of positive pressure withstand test is similar to that of negative pressure withstand test, that is, the initial positive pressure is set at any pressure, such as 0 pressure or 10kPa. The slope of pressure rise, i.e. slope, can be set, such as 10kPa /min: the test requires that the pressure rise can be adjusted in proportion to the time.
Part3. Rupture test
It can be divided into negative pressure rupture test or positive pressure rupture test. The product is required to break instantly when the vacuum is extracted or the pressure is applied to a certain pressure range. The breaking pressure shall be recorded. The test difficulties are: the air tightness tester’s extraction of negative pressure requirements to meet the second test requirements, the pressure rate can be adjusted, and the pressure explosion should be completed within the set range, can not exceed the range. In other words, blasting below or above this range does not meet the product test requirements, and the test pressure of this burst point should be recorded. When the actual test, this determination needs to have anti-riot device, the usual anti-riot device is to place the test workpiece in a pressure resistant stainless steel cylinder, the test workpiece needs to be sealed, the stainless steel cylinder of the outer cover needs to set high pressure relief valve, to ensure safety. When the explosion occurs, the connector fragments are scattered inside the pressure stainless steel cylinder, which will not cause injury to personnel.
From the above analysis, we can see that the air tightness tester is generally to design three different devices to complete the sealing leak test needs to be completed by forming the leak detector with a fixture system. Pressure test needs to increase the proportional control valve set, the precise setting of the pressure value and the proportional relationship of time. Fracture test requires that the product burst within a certain range, but also record the burst value. If the three systems are integrated together, it is a more complex system engineering. Of course, the three tests are usually required to be completed comprehensively. The initial pressure value can be set arbitrarily, and the rate of pressure increase or decrease can be adjusted. When the pressure increases or decreases to a certain value and reaches the range set for blasting, the blasting pressure will be recorded. If the pressure increases or decreases to a certain value and the product does not burst, the seal leak test is performed and the leakage rate or pressure change per unit time of the seal test is recorded.
Test results need to be stored for quality traceability after testing. All test data are required to be traceable and stored and uploaded in the format required by the test to facilitate quality analysis and quality control. For the sealing leak detection industry, these European and American automobile companies have specific requirements for the leak test: the bar code of the workpiece should be scanned and recorded before the test, and the bar code should correspond with the specific test results such as date and time after the test. Above, is the automotive connector sealing test related requirements, I hope to help you.
Post time: Apr-13-2021