鋳ぐるみ端面接合の数値解析における計算条件に関する考察

抄録

  This paper discusses calculation methods with a two-dimensional model and calculating factors as interfacial heat transfer coefficient and initial temperature in end surface cast-in insertion. In this process, the temperature and solidification progress at the interface in about 100s after pouring are important for the bonding. In calculating these conditions at the interface, it is necessary that the values and boundary conditions used in the calculations are reasonable. In a previous paper, the measured temperatures were used in the calculation as the boundary condltion. To perform realistic calculations with only the initial temperature, interfacial heat transfer coefficients (IHTC) between cast iron melt, sand mold, and steel insert were obtained by temperature measurement and simple inverse method. The calculated IHTC value between melt and mold was 290 W/m²K on the average, and 116 W/m²K at the interface of the insert and mold. There was hardly any difference in the calculated results with the IHTC at the melt-insert interface from 5000 to 12000 W/m²K. These results agreed with the values used in the previous papers. The effects of the initial temperature and IHTC values on the calculated results were also examined.