Processing Technology of Cylinder Head Body of Marine Diesel Engine Parts

The engine cylinder head is one of the most critical parts of the engine. Its precision requirements are high, the processing technology is complex, and the processing quality directly affects the overall performance and quality of the engine. Therefore, the processing of the engine cylinder head is particularly important. The key parts of the valve seat ring and The processing of the conduit hole is the most important thing.

DK28 diesel engine parts The engine's intake and exhaust valve seats are important working parts that control the gas intake and exhaust gas discharge. During the working process, they will be subjected to the erosion of the airflow and the impact friction of the valve at high temperatures. The working conditions are very harsh: normal When working, the valve seat ring has been exposed to a high temperature of (600~800) ℃ for a long time. Factors such as high temperature gas corrosion and part deformation will cause the valve guide and seat ring cone to be damaged intensified, resulting in a loose valve seal. A large amount of energy increases with the high temperature gas. The exhaust is wasted in vain, thus greatly reducing the power of the engine. Therefore, the valve seat ring and the duct hole should have good high temperature wear resistance, corrosion resistance, heat transfer and high temperature strength, high temperature creep resistance and thermal expansion coefficient matching the cylinder head. At the same time, if the center of the valve and the center of the valve seat ring are too large when the engine is working, the engine power will decrease and the fuel consumption will increase, and the wear of the valve and the duct hole will also be accelerated. Therefore, the machining accuracy of the valve seat ring and the duct hole, especially the runout of the valve seat ring working cone face the duct hole, stipulates strict tolerance limits.

The general requirements for the machining accuracy of the engine cylinder head valve seat ring and the duct hole are: the coaxiality tolerance requirement of the gasoline engine is (0.015～0.025) mm; while the diesel engine is only (0.01～0.015) mm, and the cone runout is ( 0.03～0.05) mm, the hole accuracy requirement is generally H7.