Numerical Simulation Of Solidification Process Of Bimetallic Composite Wear-resistant Rolls Prepared By Insert Molding

Roller has been used wilely in wear-resistant industry.Compared with the single roll,the bimetal composite roll has better wear resistance and longer service life.Previously,the research of roller is mainly concentrated on the single material,or the solidification process of bimetal composite roll by experimental studies.there is little theoretical study on the numerical simulation of the solidification process of bimetal composite roll.In this paper,ANSYS finite element software was used to simulate the solidification process of bimetallic composite wear-resistant roll,including the simulation of temperature field and stress field in solidification process.In this paper,the temperature field and thermal stress field of the solidification process of bimetallic composite wear-resistant roll were studied at three different pouring temperatures(1300 ?,1400 ?,1500 ?).The results show that the higher the pouring temperature,the slower the rate of solidification and the higher the thermal stress and more prone to shrinkage and other defects;pouring temperature is low,the solidification rate is fast,will lead to casting solidification process is not uniform and so on.So the cast in the actual casting process selected pouring temperature of 1400 ?,can effectively prevent the generation of shrinkage.At the same time,the influence of three different shapes of roll core on the temperature field and stress field of the bimetallic compound wear-resistant roll was studied.The results show that the effect of roller core shape on the temperature field of casting solidification process is small at the beginning of solidification.In the middle of the solidification,the solidification rate of the casting of the rectangular box roll core is the fastest,the solidification speed of the casting of the six prism roll core is the slowest,and the solidification speed of the casting of the cylinder roll core is more suitable.The thermal stress of the castings of the hexagonal roller core is greater than that of the casting of the rectangular parallelepiped roll,and the thermal stress of the rectangular box roll core is greater than the thermal stress of the casting of the cylindrical roll core.In this paper,Abaqus is used to verify the temperature field and stress field of the solidification process.The results show that the results of the Abaqus simulation are consistent with the results of ANSYS calculation.The accuracy and reliability of the simulation of the temperature field and stress field in the solidification process of ANSYS composite wear-resistant roll are verified by simulation.At the same time,the parameters after ANSYS simulation are optimized,and the optimized parameters are applied to the verification experiment.The castings cast by the experiment are in good agreement with the results of ANSYS simulation and optimization.The accuracy and reliability of ANSYS on the numerical simulation of bimetallic composites are verified from the experimental point of view,which indicates that the numerical simulation technology has certain guiding significance to the actual casting process.