material use in engine block
Material used in engine block casting
In order to meet the above functional requirements the material used for manufacturing the product should contain many properties. They are, the material should contain high strength, modulus of elasticity, wear resistance, ability to withstand vibrations, and corrosion resistance. High strength is mostly concerned in diesel engines because of their high compression ratios compared with petrol engines. In diesel engine its compression ratios are normally 17:1 or greater, but in petrol engine it is nearly 10:1. The material also should have low density to reduce its weight but with higher strength. It should also have a low thermal expansion under high operating temperatures and also a good thermal conductivity to give out the heat in minimum time. When it come to the manufacturing process the material should have good machinability and castability to reduce the time and cost consumed. As if the material is too hard the time and cost for manufacturing increases. When the engine is in running conditions it generates a higher vibration due to the motions in the internal parts like crank shaft and pistons, therefore the material has to be able to absorb the vibration energy with out fracturing.
Based on the above features the most widely used material are cast iron and aluminum alloys to manufacture the cylinder block. Cast iron alloys are used because they contain good mechanical properties, low cost, and availability compared with other metals. But certain aluminum alloys contain most of the characteristics of cast iron but with low weight. And also aluminum alloy casted engine block gives a good surface finish and high macinability compared with cast iron alloys. As the technology increases the engineers has found new materials such as graphite cast iron which is lighter and stronger than the grey cast iron mentioned above.
Grey cast iron alloys
Grey cast iron is the first and most material used for manufacturing
In order to meet the above functional requirements the material used for manufacturing the product should contain many properties. They are, the material should contain high strength, modulus of elasticity, wear resistance, ability to withstand vibrations, and corrosion resistance. High strength is mostly concerned in diesel engines because of their high compression ratios compared with petrol engines. In diesel engine its compression ratios are normally 17:1 or greater, but in petrol engine it is nearly 10:1. The material also should have low density to reduce its weight but with higher strength. It should also have a low thermal expansion under high operating temperatures and also a good thermal conductivity to give out the heat in minimum time. When it come to the manufacturing process the material should have good machinability and castability to reduce the time and cost consumed. As if the material is too hard the time and cost for manufacturing increases. When the engine is in running conditions it generates a higher vibration due to the motions in the internal parts like crank shaft and pistons, therefore the material has to be able to absorb the vibration energy with out fracturing.
Based on the above features the most widely used material are cast iron and aluminum alloys to manufacture the cylinder block. Cast iron alloys are used because they contain good mechanical properties, low cost, and availability compared with other metals. But certain aluminum alloys contain most of the characteristics of cast iron but with low weight. And also aluminum alloy casted engine block gives a good surface finish and high macinability compared with cast iron alloys. As the technology increases the engineers has found new materials such as graphite cast iron which is lighter and stronger than the grey cast iron mentioned above.
Grey cast iron alloys
Grey cast iron is the first and most material used for manufacturing