Research On Extrution Forming Process Of6S60MC-C Large Marine Crank

Large marine crankshaft is an important part of large ship engines, and the crank isthe key component of large combined crankshaft, its working condition is complex,provides an important guarantee for the ship’s smooth, safe driving. As China’s demand forlarge ships are increasing, coupled with a large marine crank is expensive, thus improvethe forming quality and utilization ratio of material can greatly enhance thecompetitiveness of domestic crank, and produce the enormous economic benefits.In order to improve the crank forming quality and reduce the machining allowance,this paper presents a6S60MC-C large marine crank extrusion program, and designs thecorresponding extrusion tooling, the extrusion process are studied systematically by usingthe method of combining numerical simulation with experiment.In this paper, using the finite element simulation software DEFORM-3D, accordingto the rigid plastic theory, the extrusion process of6S60MC-C large marine crank areanalyzed by thermal mechanical coupled numerical simulation. The variation rule of theforming force, the metal flow, and the effect of temperature field in extrusion process isanalyzed.This paper discusses the main defects and the causes of the formed crank at the top,and establishes crank forming quality evaluation index with considering the forming forcetogether. By using the method of single factor rotating, the effect law of initial billettemperature, friction coefficient, the mold pressing speed of process parameters and moldshape parameters on the forming quality is analyzed. In the premise to reduce the crankend defects and forming force, to determine the optimal process parameters and dieparameters of crank extrusion forming.In the research as the foundation, the size ratio of1:10lead and extrusion tooling for6S60MC-C large marine crank extrusion process was studied. The experimental resultsand the simulation results were compared and analyzed, the results indicate that theexperimental results and numerical simulation results are in good agreement, the proof ofthe correctness of the numerical simulation results and the design of rationality of the crank extrusion process and tooling. This provides important reference basis for practicalproduction and manufacturing of large marine crank.