Research On The Die Forging Technology Of Crankshaft With Non-quenching Steel

The crankshaft is one of the important parts of the engine, in die forging productionbelongs to the typical complex difficult forgings. With the engine to reduce fuel energysaving, high performance, high efficiency the direction of development, car crank shaftforging need to new requirements. In materials, crankshaft forgings has been widely usednon-quenching and tempering steel..Not only to avoid the defects of the forging afterquenching and tempering treatment also makes the crankshaft to achieve better mechanicalproperties and microstructure. In die forging process, due to the crankshaft dynamic balanceperformance requirements increase, the appearance of the crankshaft is more and morecomplicated. In die forging forming often faces forming difficulty, the forming qualitydifference (including filling with folding, crack, cracks, etc), the crankshaft forging producemore often die before try, mould development time is long, low material utilization ratio.How to improve the crankshaft forging process and material utilization. How to improve thecrankshaft forging and material utilization in order to enhance engine performance andreduce the production cost is the car industry attention and the key point.In this paper briefly introduced the conditioning steel, die forging forming technologyand research situation, choose a certain space parting curve of crankshaft balance turn sixvehicle as the research object, using Gleeble measured the thermal simulation of materialflow stress. established the high temperature of the material flow stress model for thesubsequent FEM lay material attribute, By the experience design with three-dimensionalmodeling software UG and the numerical simulation with Deform3D, the influence on themetal flow, mould filling, stress and strain distribution of forging part, from the parametersof web and resistance wall are analyzed. Through the simulation analysis,the structure andsize of web, the parameters of resistance wall, and the billet size are optimized, whichrealize the target that improve the die structure, get rid of the forming defects and increasethe material utilization.This topic combination physical tests of non-quenched steel, crankshaft forging processand the finite element simulation technology, improve the forming quality of the crankshaftforgings and material utilization for the purpose, and ultimately shorten productdevelopment cycle, reduce product the effect of the cost. The research results can be directly used to guide the production, and provides a theoretical and practical basis for similarcrankshaft forging production and mold design.