Austempering ductile iron (ADI) supercharged diesel engine six-cylinder crankshaft and production method

Abstract

The invention belongs to the class of metal materials. After a supercharged technology is used for a diesel engine, the load born by a crankshaft is improved by 45-67 percent. The fatigue property of ordinary ball iron cannot meet the requirement of service and is replaced by alloy steel. The invention provides an austempering ductile iron (ADI) supercharged diesel engine six-cylinder crankshaft and a production method which both determine chemical constituents, particularly determine the addition of alloying elements, propose definite requirements on the percent of spheroidization and the number of graphite pebbles and also determine the parameter of an isothermal quenching process. After quenching, the deformation of the six-cylinder crankshaft is controlled within a certain range, which is a key measure of the method. A special heat treatment tire for quenching the six-cylinder crankshaft is designed so as to obtain a satisfactory result. The application of a crankshaft fillet rolling technology greatly improves the fatigue property of the six-cylinder crankshaft. The invention makes a pioneering contribution to manufacturing the supercharged diesel engine six-cylinder crankshaft by the ADI and greatly reduces the production cost of the six-cylinder crankshaft.

Description

technical field [0001] The invention relates to metal materials, in particular to an austempering ductile iron (ADI) supercharged diesel engine six-cylinder crankshaft and a production method. Background technique [0002] After the diesel engine adopts supercharging technology, the load on the crank bearing increases by 45%-67%. The fatigue performance of ordinary ductile iron can no longer meet the service requirements, and it is facing the trend of being replaced by alloy steel. The fatigue performance of ductile iron is significantly improved after austempering, so that the ductile iron crankshaft can continue to be used. [0003] 1. Requirements for fatigue strength of crankshaft materials for supercharged diesel engines [0004] The application of supercharging technology has significantly improved the performance of diesel engines, and supercharging diesel engines has become an important direction for the development of diesel engines. In a diesel engine, the cranks...

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Problems solved by technology

[0024] The purpose of the present invention is to provide a six-cylinder crankshaft of an austempered ductile iron (ADI) supercharged diesel engine and its productio

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