Dalian engine cylinder head leak testing machine: adapted to multi cylinder structure, customized sealing fixture

Dalian engine cylinder head leak testing machine: adapted to multi cylinder structure, customized sealing fixture

The engine cylinder head, as the "cover plate of the power center", integrates dozens of chambers such as oil passages, water passages, and air passages. Its sealing performance is directly related to fatal faults such as coolant leakage and oil air mixing. The structural differences of cylinder bodies with different numbers and displacements are significant, making it difficult for universal testing equipment to adapt. However, the engine cylinder head leak testing machine, with customized sealing fixtures, accurately solves the testing problem of multi cylinder body structures and has become the core equipment for quality control in automotive companies.

Customized sealing fixtures are the "core key" to adapt to multi cylinder structures. The air duct layout and oil duct diameter of four cylinder, six cylinder, and even twelve cylinder engine cylinder heads are completely different, and the sealing requirements for different chambers of the same cylinder head vary - the water duct needs to withstand high-pressure coolant, and the air duct needs to ensure airtightness to maintain compression ratio. The leak testing machine is designed with dedicated sealing modules for each type of cylinder head: using food grade silicone material to make a fitting sealing ring, accurately matching the irregular ports of each cavity; By using multiple sets of adjustable pressure heads, the sealing pressure is automatically calibrated according to the curvature of the cylinder head surface, ensuring that the oil, water, and air passages are sealed without dead corners, avoiding the drawbacks of traditional fixtures such as "one leak, all inspection waste".

The rapid adaptation capability of Dalian engine cylinder head leak testing machine tooling is more in line with the requirements of mass production scenarios. Automobile production lines often need to switch between different types of cylinder head inspection tasks. The customized tooling for leak testing machines adopts modular design and is equipped with a quick locking mechanism. For cylinder heads with different displacements such as 1.5L and 2.0L, tooling replacement and parameter adjustment can be completed in just 60 seconds. After a passenger car factory introduced this equipment, the cylinder head inspection and replacement time was shortened from 40 minutes to 3 minutes, and the daily inspection capacity was tripled. In addition, the surface of the tooling is covered with wear-resistant coating, which maintains sealing accuracy after 100000 insertion and extraction tests, and is suitable for high-frequency production testing needs.

The adaptability ultimately lies in the implementation of detection accuracy. After precise fitting of customized chemical equipment and cylinder head, the leak testing machine adopts multi-channel differential pressure detection technology to synchronously monitor the pressure changes of each chamber. The detection accuracy can reach 0.01Pa and can capture a micro leak of 0.001ml per minute. For cylinder heads made of different materials such as aluminum alloy and cast iron, the fixture can automatically adjust the sealing pressure - applying a low-pressure seal of 0.3MPa to lightweight aluminum alloy and increasing it to 0.8MPa for high-strength cast iron, which not only avoids pressure damage to components but also ensures detection accuracy. According to data from a certain engine factory, the introduction of this equipment resulted in a 92% decrease in after-sales failures caused by poor cylinder head sealing.

From the precise adaptation of the multi cylinder structure of the Dalian engine cylinder head leak testing machine, to the efficient switching of production scenarios, and to the stable output of detection accuracy, customized sealing fixtures endow the cylinder head leak testing machine with irreplaceable professional value. It is not a simple "testing tool", but a "quality partner" that matches the depth of multiple cylinder heads, laying a solid first line of defense for the power performance and operational safety of the engine.