Air tightness test of automobile headlights

Release time:

2023-05-24

As we all know, the automobile industry is one of the pillar industries of our country.

Automobile quality testing requirements are very strict, the state has developed a lot of relevant standards, after all, once an accident, the consequences are serious. So every car has to go through a variety of tests before it leaves the factory, and many parts also have separate tests. Headlights, reversing images, dash-recorder probes, etc. are exposed on the surface of the car as electrical equipment, which requires high sealing; In particular, the tightness of the headlights is not good in the rain and fog days, car washing and other humid environment is easy to fog and even water, the headlights in the use of water may produce the situation of "burst lights", thus infringing on the personal and property safety of the driver, so waterproof detection is an essential link, auto headlights manufacturers will carry out the tightness detection of the headlights.

Due to the design, manufacturing and assembly process and materials of the headlight and many other influences, in the combination surface of the lighting mirror and the lamp body, the assembly interface of the headlight and the body and the electrical interface, there will inevitably be leakage. To this end, the international automobile headlight manufacturing industry regulations in addition to the normal intake and exhaust, but also allowed to exist a certain amount of leakage. But if the leakage amount of car headlights is too large, it will cause a series of problems in the headlights such as fog, water, damage air exchange effect and so on, seriously affecting the headlights lighting, life and appearance of the headlights, endangering driving safety. Therefore, the international automobile headlight manufacturing industry has put forward the requirement of air tightness.

There are two kinds of sealing test for automobile headlights, one is positive pressure check. The other is the negative pressure check. This paper mainly introduces the positive pressure check. Most car taillights do not have inflatable ports, we Lake Company for its customized special mold in order to carry out air tightness detection. The mold is divided into upper mold and lower mold, which can provide a sealed testing environment for sealing test. The tooling is connected with the instrument host to play an important conduction role.

Positive pressure inspection, according to the requirements of different industries and products, the workpiece is sealed by fixture and then connected to the air source and air tightness leak detection equipment, set a certain standard value and beat, to fill a certain pressure of gas into the workpiece, so as to judge whether the workpiece is qualified. The whole test process is divided into four steps: inflation, stability, test and exhaust. The system determines the tightness of the product by detecting the internal pressure variation.

For different products and requirements of different waterproof grades. The test pressure and test parameters will be set differently. Mainly according to the test product to carry out multiple tests, to test the qualified and unqualified products, according to the actual use of the final calculation of a selected pressure test parameter. Wuxi Lake is an expert in the air tightness and waterproof testing industry. The air tightness detector developed and produced by the company has the characteristics of high precision (test accuracy can reach 1pa), good stability, high efficiency and no damage to the tested products. It is very suitable for waterproof detection of mass production products, especially for waterproof detection of electronic products. The measuring range of the instrument is optional in the range of -99-3000kpa. The sealing tester can support leakage testing, blocking testing, positive pressure testing, negative pressure testing and other leakage testing methods. The test range is wide, and users can choose according to their own testing needs.

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Air tightness test of automobile headlights