Numerical Analysis Of Thermal Structure And Forging For The Piston In A Certain Car Engine

By the finite element analysis method, the rationality of the piston design andforging processes in an automobile engine is analyzed in this paper. It is conducted thatthe virtual design and manufacture method could verify the feasibility of the schemes,reduce the number of physical experiments or instead of them, increase the efficiencyof research and manufacture, and low the cost of the product.The stress, the deformation and the temperature of the piston are predicted whichis under the pressure and temperature load of the gas during the design phase by thefinite element analysis method. The result reveals that the stress concentration is on thetop of the piston-pin boss. To make the piston-pin boss optimization, a non-circularpin-hole is designed. The result shows that the design of the non-circular pin-holecould reduce the centralized stress, improve the load capacity of pin-hole effectively,and extend the work life of piston.During the manufacture phase, two forging schemes that forward extrusion andbackward extrusion are designed. The backward extrusion scheme is proved to bebetter than the other scheme by the finite element analysis. The forging force isreduced and the abrasion lifespan of the module is improved by the backwardextrusion method. At last, the qualitative and quantitative assessments are made aboutthe two schemes.Finally, the simulations of the different craft parameters are also carried out. Andthe data are obtained by these experiments. The interpolation curves are drawnaccording the data. This study is found that the desired craft parameters by the analysisof the interpolation curves and the production practice.