The Flow Field Numerical Simulation Of Cu-Cr-M Alloy In The Continuous Casting Solidification Process

Cu-Cr-M (M=Zr、Mo、Nb、Y、Gd) copper alloy is a class of integrated material withstructure and function owing to their high strength, high conductive and highwear-resistance. Copper alloy has a broad space for development. How to improve theefficiency and performance of the production of high strength and high conductivitycopper alloy will also become an important research topic.In this paper, due to the flow field within the continuous casting of copper alloy intothe mold and copper mold liquid flow turbulence characteristics, the k-ε two equationmodels were established on the basis of momentum equation and continuity equation. Thecomputational domain was meshed by a staggered grid. The discrete control equation wascalculated through discrete individual control equation, SIMPLE algorithm. The flow fieldin the crystalline was simulated, by changing the casting speed, nozzle immersion depthoutlet angle and nozzle outlet diameter. The following conclusions: With the drawingspeed increasing will cause of crystallizer impact flow on the crystallizer narrow surfaceimpact strength to strengthen, It is easy to cause the leakage of casting blank. the quality ofproduction will also be worse. So it is unfavorable to use higher casting speed, take1m/min casting speed is reasonable. Along with the nozzle’s immersion depth increasing,both of the speeding of fluid and turbulent kinetic energy is reduced, so the depth of nozzleshould be deeper with the increasing casting speed, but with the immersion depthincreasing, the depths of the crystallizer’s hot area then move down, leading to the settingof the solidified shell to be thin, it will have a bad effect on the grow of solidified shell、bubble and inclusion’s floatation in crystallizer. With the angle increasing, the impact forceof the restricted area in crystallizer will be weaken, the depth of impact will be increase,the fluctuate near the liquid level in crystallizer will be weaken, it is easy to form airbubble and flaw, it is easy to cause the leakage of casting blank. So it is unfavorable to uselarge downward angle,15°is suitable. With the increase of diameter, the speed of the impact near the exit will be weaken, it is good to the formation of solidification shell, butwhen the diameter is too big, it will intensifying the blockage of nozzle, so the size of thenozzle should not design to big,40mm is suitable.