Product design of cast automobile engine exhaust manifold

  1. Thin wall

In order to meet the needs of the era of low emission and lightweight, promote global sustainable development, and fully realize the environmental protection needs of energy conservation and emission reduction, we must do a good job of weight reduction in the design of automobile parts. In the whole vehicle fuel consumption, most of the fuel consumption is closely related to the overweight of the car body. Therefore, if you want to reduce the fuel consumption and emissions of the car, you must make a weight reduction design for the whole car. According to authoritative research, the reduction of vehicle weight can not only reduce fuel consumption in the same proportion, but also reduce vehicle emissions. In order to meet the requirements of vehicle weight reduction, the exhaust manifold has been developing in the direction of thin wall and light industry, and the wall thickness of many exhaust manifolds is only 2 Mm, but at the same time, it also requires that the material of exhaust manifold has stronger heat resistance and compression resistance. When selecting the material, we must choose the material with better performance. Instead of using traditional cast iron, we should use more advanced heat-resistant material. Such as high nickel austenitic heat-resistant ductile iron or stainless steel materials. When casting, we should abandon the traditional wet sand casting process and adopt a new shell mold casting or core cladding process; when casting, we should no longer use the heavy gravity casting mode, but adopt a new low-pressure casting mode; when casting, we should give up the sand mold casting method and adopt a more advanced ceramic casting method.

  1. Integrated design

In order to make the development prospect of exhaust manifold better and better, it is necessary to do a good job in the overall design, not only to do a good job in weight reduction design, but also to do a good job in the overall design of volute. In this way, it is not only conducive to the overall development, but also can fully reduce the cost, but at the same time, the level of casting technology must be further improved, so as to keep up with the overall design changes. In the process of engine casting in Europe, the overall design of the volute is used many times. This design can not only fully integrate the interior of the engine, but also reduce the heat, reduce the emission temperature, make the overall operation of the engine more stable, increase the efficiency, but also reduce the warm-up time faster. This design is widely used in Europe, common in the Willan model.

  1. Others

The purpose of reducing the temperature of the exhaust manifold is achieved by equipping the water jacket inside the exhaust manifold. This method not only reduces the cost, but also makes the selection of materials more flexible. Expensive and scarce high temperature resistant stainless steel materials are no longer needed. Ordinary cast iron or aluminum alloy materials can fully meet the manufacturing needs. Therefore, the design has been put into use on a large scale. In addition, ceramic coating technology is added inside the exhaust manifold, which can not only increase heat resistance, but also increase oxidation resistance.

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