The more important and complicated castings on the car are located on the heart of the car, the engine. In order to prevent car "heart disease", the quality of the main castings on the engine is particularly important. The cylinder is a relatively large and complex casting on the engine. The thickness of the cylinder is often less than 3mm at the thin wall. It is mostly cast from high-strength gray cast iron. It also uses vermicular cast iron. It is used for the lightweight development of automobiles. There are also more and more aluminum alloys, and some foreign automobile manufacturers even started to consider using magnesium alloy gold casting cylinders. The weight of the U.S. General Motors Vs engine block is 94.4kg when cast iron, but only 24.5kg with aluminum alloy, and the weight ratio of cast iron and cast aluminum is 3.9:1.
The casting method used to produce the cylinders varies depending on the material. There are various options for different conditions in each plant, including air punch molding in wet sand molding, static pressure molding, high-pressure multi-contact molding, no-box extrusion molding, and shock pressure molding. Wait. The early production process of aluminum alloy generally uses low-pressure casting and metal-type casting. Recently, the use of die-casting technology is increasing. At present, domestic aluminum alloy cylinders are still used for low pressure casting on the Q492 engine. Aluminum alloy material production technology is also continuously improving, and a number of excellent aluminum alloys have been used for production, such as the 390 alloy developed by the US company Reynolds Metals. On the other hand, the development of aluminum casting manufacturing technology has led to a continuous decline in the cost of mass production of aluminum cylinder blocks. At present, the application of cast aluminum cylinder block has been very extensive, and the application in the car has reached the popularization stage. For cast aluminum cylinders, die-casting and low-pressure casting are used. Lost foam casting and squeeze casting (pre-embedded cylinder liners made of aluminum-based composite materials) and semi-solid castings are also used in foreign countries, and casting sand casting techniques are used in some cases. (such as DISA casting process).
The casting method used to produce the cylinders varies depending on the material. There are various options for different conditions in each plant, including air punch molding in wet sand molding, static pressure molding, high-pressure multi-contact molding, no-box extrusion molding, and shock pressure molding. Wait. The early production process of aluminum alloy generally uses low-pressure casting and metal-type casting. Recently, the use of die-casting technology is increasing. At present, domestic aluminum alloy cylinders are still used for low pressure casting on the Q492 engine. Aluminum alloy material production technology is also continuously improving, and a number of excellent aluminum alloys have been used for production, such as the 390 alloy developed by the US company Reynolds Metals. On the other hand, the development of aluminum casting manufacturing technology has led to a continuous decline in the cost of mass production of aluminum cylinder blocks. At present, the application of cast aluminum cylinder block has been very extensive, and the application in the car has reached the popularization stage. For cast aluminum cylinders, die-casting and low-pressure casting are used. Lost foam casting and squeeze casting (pre-embedded cylinder liners made of aluminum-based composite materials) and semi-solid castings are also used in foreign countries, and casting sand casting techniques are used in some cases. (such as DISA casting process).