Design Of Cavity Shape Of 150mm×150mm Square Billet Continuous Casting Mould

The key technology of the high speed continuous casting is that the uniform solidified shell with enough thickness and intensity was formed to support the ferrous pressure and prevent breakthrough, during the elevated-temperature melting steel passing through the cavity of mold in a very short time. Nowadays, continuous casting mold has developed from straight plane mold to curve surface mold, the substantial characteristic of continuous casting mold is its optimized continuous taper curve. However, the design and calculation formula for the mold taper curve design, involving the various influencing factors, has not been established quantificationally, because of the unfavorable working conditions and the various influencing factors. Through the simulation of the square billet and copper tube of the mold, the square billet solidification and copper tube deformation are obtained. The inner mold surface is designed and the longitudinal taper curve is modified in order to agree with the casting shrinkage, and then, the design method of inner mold surface is proposed.The square billet mold for casting Q195 steel with the dimension of 150 mm×150 mm was analyzed. The finite element method is employed to analyze the process of continuous casting with different casting speed.A finite element model of billet in the mold is established, the solidification process of casting in the mold is simulated by using two-dimensional slice method. The temperature distribution of the square billet and the shrinkage of the shell of the square billet are obtained in different casting speeds.A three-dimensional steady-state finite element method model of the mold is established, The temperature field of the mold is simulated with different casting speeds. And then, the thermal element is converted into the structural element, a deformation model of the mold is established, the result of the thermal analysis is employed as initial conditions to the model of mold copper tube, deformation of the mold is analyzed.Based on the casting shrinkage and the mold deformation, a new inner surface of mold is designed. The curve shape of the modified involute is employed to the cross section of mold in order to adapt the deformation of the corner of the square billet, which is faster than that of the center of the surface. In the longitudinal direction of mold, a modified taper is added to adapt the shrinkage of the square billet better, in the process of the transition from the curve surface to the straight surface.