Numerical Simulation And Parameter Optimization Of Horizontal Continuous Casting Of Cast Iron Bars

Dense bars is mainly used in hydraulic,refrigeration,railway transportation and other industries,widely used in the production of hydraulic valve body,hydraulic integration block,gear pump gear,pump body,cylinder piston,etc.With the rapid development of metallurgy industry and horizontal continuous casting technology,how to improve the quality and production efficiency of horizontal continuous casting Dense bars has become one of the hot issues in the field of metallurgy.The setting of continuous casting process parameters is a key link in the production of Dense bars by horizontal continuous casting.Unreasonable setting of continuous casting process parameters will easily cause cracks on the surface of bars in the process of drawing,and even lead to production accidents such as crack and leakage.Therefore,it is of great significance to study the solidification behavior of Dense bars in different cooling stages of horizontal continuous casting and the solidification process of cast billet under different continuous casting parameters.This thesis takes the horizontal continuous casting process of ductile iron with a diameter of 70 mm produced in a horizontal continuous casting factory as the research object,selects the research method of numerical simulation,and uses the three-dimensional modeling software Solidworks to establish the horizontal continuous casting simulation model of Dense bars.based on the Mi LE algorithm of round billet in the casting simulation software Pro CAST in mold and secondary cooling zone was carried out in line with the actual situation of the unsteady numerical simulation of the round billet temperature,solid fraction and stress distribution,and the solidified shell thickness of the slab in the mould exit and slab solidification zone into a crack index as the restriction condition,The changes of minimum billet thickness and billet crack index under different continuous casting process parameters were studied,and the rationality of continuous casting process parameters was analyzed by taking the empirical formula of safe billet thickness and crack index as reference.Through the orthogonal test and the range analysis of the orthogonal test results,the optimal scheme of each influencing factor and the influence degree of each continuous casting process parameters on the minimum billet shell thickness and the maximum average cracking index of solidified billet shell at the outlet of the mold were determined.The results show that the superheat and drawing period have the greatest influence on the minimum shell thickness and cracking index of solidified shell at the outlet of mold respectively.The effect of drawing stop ratio and drawing speed on the minimum shell thickness and cracking index of solidified shell at the outlet of mold is the least.By comprehensive balance method and comprehensive evaluation method to mold the exit minimum shell thickness and solidification shell maximum average crack index were analyzed,and the results show that in the continuous casting process parameters superheating temperature is 25℃,pulling speed is 40mm/s,pulling cycle for 4s,draw stop than was 30% can meet the level of continuous casting slab quality and efficient production,Is the best parameter combination of continuous casting process in orthogonal test.