The experimental study shows that the pull-in of the broad faces (rolling faces) of the EMC large aluminum alloy slabs mainly forms during the solidification process. The thermal bending moment caused by the thermal g...The experimental study shows that the pull-in of the broad faces (rolling faces) of the EMC large aluminum alloy slabs mainly forms during the solidification process. The thermal bending moment caused by the thermal gradient of the solidified shell along the broad faces is the main reason for the formation of pull-in. The tangential forces resulted from the change of the solidification front curvature push the liquid metal of the solidification front from the hot section to the cold end and compensate the contraction of the cold end, thus form the irreversible deformation. Based on these mechanisms, the Tm-BD software system that can design the opening of molds was programmed. As an example, the straightness of the 1 300 mm×480 mm slab with the using mold opening was calculated. The agreement of the calculated and measured results provides the basis to optimize the mold design with or without opening.展开更多
The deformation mechanism during the solidification was analyzed based on the experimental results of the castings. An approximate quadratic differential equation and its discrete model of calculation deflection were ...The deformation mechanism during the solidification was analyzed based on the experimental results of the castings. An approximate quadratic differential equation and its discrete model of calculation deflection were proposed. The model indicates that the key factors leading to the deflection deformation are the thermal bending moment M and the flexural rigidity EJ. The smaller the former and the larger the latter is, the smaller the deflection deformation will be. The experiments are carried out at various technical conditions, and their results appear good agreement with calculation ones. A method was proposed to predict and control the casting deformation.展开更多
文摘The experimental study shows that the pull-in of the broad faces (rolling faces) of the EMC large aluminum alloy slabs mainly forms during the solidification process. The thermal bending moment caused by the thermal gradient of the solidified shell along the broad faces is the main reason for the formation of pull-in. The tangential forces resulted from the change of the solidification front curvature push the liquid metal of the solidification front from the hot section to the cold end and compensate the contraction of the cold end, thus form the irreversible deformation. Based on these mechanisms, the Tm-BD software system that can design the opening of molds was programmed. As an example, the straightness of the 1 300 mm×480 mm slab with the using mold opening was calculated. The agreement of the calculated and measured results provides the basis to optimize the mold design with or without opening.
文摘The deformation mechanism during the solidification was analyzed based on the experimental results of the castings. An approximate quadratic differential equation and its discrete model of calculation deflection were proposed. The model indicates that the key factors leading to the deflection deformation are the thermal bending moment M and the flexural rigidity EJ. The smaller the former and the larger the latter is, the smaller the deflection deformation will be. The experiments are carried out at various technical conditions, and their results appear good agreement with calculation ones. A method was proposed to predict and control the casting deformation.
