EVALUATING METHOD FOR FLOW ANALYSIS IN DIE FORMING OF MOLTEN MATERIAL

摘要

PURPOSE:To evaluate and decide correct maximum molten material pressure and a range of a die temperature by deriving as a function in which the die temperature is a variable with regard to the maximum molten material pressure in an evaluation object part of each element which has been brought to minute division of a formed part shape model, by a result of arithmetic operation of a molten material pressure distribution against a variation of the die temperature. CONSTITUTION:An analysis is executed by giving plural die temperature with regard to one or two or more molten material temperature conditions, respectively. By a result of arithmetic operation of a molten material pressure distribution, the maximum molten material pressure in an evaluation object part of each element against the die temperature is derived at every molten material temperature condition. From a data of the maximum molten material pressure Pn, Pn+1 corresponding to die temperatures Tn, Tn+1 of two adjacent points, deviations DELTATn(=Tn+1-Tn) and DELTAPn(=Pn+1-Pn) and a ratio of deviations DELTAPn/DELTATn are derived, and it is repeated successively. Subsequently, an increase gradient DELTASn(=DELTAPn+1/DELTATn+1-DELTAPn/DELTATn) of the deviation ratio is derived, and a die temperature Tn of a point in which its positive and negative are reversed is calculated. Next, a function of the maximum molten material pressure in which the temperature TB is a boundary and the die temperature is a variable is shown as two different functions Pmel=f1(T), Psol=f2(T).