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Comprehensive introduction of the engine crankshaft materials

Date:2015-10-14 17:51:02

Comprehensive introduction of the engine crankshaft materials. According to its development history as well as chemical composition, organization of various materials, properties, processing technology, the cost price of comparative analysis, explain its development trend is alternative ductile iron crankshaft forging steel crankshaft, in as-cast pearlite ductile iron crankshaft instead of heat treatment of the crankshaft. Ductile iron and steel is the key to improve the toughness, developed by QT740-3 as-cast pearlite ductile iron crankshaft shows that performance of as-cast ductile iron reached a new height. In addition to several new crankshaft materials are analyzed. Crankshaft by changing gas pressure at work, inertial force and moment, and in all parts of bending, torsion, shear, tension and compression alternating stress, etc. The importance of the crankshaft and its working condition of the complexity of crankshaft has higher tensile strength, fatigue strength and surface strength, wear resistance, and the core to a certain toughness. In addition, shall comply with the world development trend of automotive materials, namely using lightweight materials to reduce car weight, reduce automobile fuel consumption, save oil resources, reduce environmental pollution; Selection and development

Alternative materials to simplify parts production process, reduce the production cost. At present, the domestic commonly used material basically has forged steel and nodular cast iron crankshaft 2 classes. Forged steel material generally for medium carbon steel and medium carbon low alloy steel, such as 45 steel, 53, 35 crmo, 40 cr steel, etc. Ductile iron crankshaft of QT600 3, QT700-2, QT800-2, 2, QT900 QT900 - - 5. Big industrial powers of the ductile iron production proportion. Although the production of cast iron, ranking second in the world, but the production of ductile iron percentage (17.8%) is far lower than the French (48.3%), Japan (40.0%), the United States (39.4%), UK (36.7%), Germany (35.1%), Italy (21.6%), and lower than the world average level (28.2%). Therefore, our country needs to be strengthen ductile iron production technology research, to further broaden the application field of adi. Especially in state-owned automobile industry development, is particularly important. Generally speaking, the crankshaft materials, is the development trend of substituted ductile iron crankshaft forging steel crankshaft, in as-cast pearlite ductile iron crankshaft instead of heat treatment of the crankshaft.

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