Numerical Simulation Of Temperature Field Of The Die For Producing Wheel Hub In Die Casting Process

The temperature fields of the die casting dies are critical to the quality of castings and the serve life of the dies. It determines the degree that the dies subject to thermal stress, and the liability that the initiations of deform and crack of the dies.This paper described the research progress and direction about numerical simulation study and its application of Die Casting dies temperature field, introduced the FEM model and its solution of numerical simulation of temperature field. And temperature distribution in the die casting process of die-casting dies, an aluminous Die Casting —wheel hub of a car, has been calculated and analyzed by FEM software ProCAST.Processing parameters of Die Casting and structures of the mould contributed to the temperature distribution of the dies directly. The author discussed quantitatively the effect of pouring temperature, pre-heat temperature, temperature of cooling water, diameters of water lines and its position on the temperature distribution by comparison.Generally, the pouring temperature is between 600 ℃ and 700 ℃ of the aluminum alloy. This paper discussed the different temperature distribution of dies when adopting different pouring temperature 650℃, 670℃and 700℃. The curve in the figure of temperature vs time and the temperature rising rate of the cavity surfaceshowed, when the pouring temperature was 650 °C, the highest average temperature of the cavity surface was 323.35"C, and the temperature rising rate was 8.4459°C/s between the time 0-10s after metal had full into cavity. And it was reasonable to adopt the pouring temperature 650 °C.Pre-heating the dies would reduce the temperature gradient in the dies. This paper discussed the different temperature distribution of dies when adopting different pre-heating temperature 180"C, 200 °C and 240 °C .The temperature gradient and the temperature rising rate of the cavity surface showed that it was more reasonable when the pre-heating temperature was 200 °C. And the temperature rising rate was 7.0734°C/s between the time 0~5s after metal had full into cavity, the temperature gradient was 12.77°C/mm.Cooling system influenced the temperature field of the dies greatly. This paper discussed the different temperature distribution of dies when adopting different temperature 30°C, 50°Cof cooling water. The results showed that the temperature field was almost the same. So the temperature of the cooling water had little influence on the die casting production, and during die casting process the temperature 50°C of cooling water was good.The positions of the water lines had a great effect on the temperature distribution of dies. This paper discussed the temperature field of the die when the water lines had a different distance to the cavity surface. The results showed that when the distance was 35mm, the temperature rising rate was 11.122°C/s, the temperature gradient was 10.975 °C/mm of the cavity surface, and when the distance was 45mm, the temperature rising rate was 9.5259°C/s, the temperature gradient was 15.045"'C/mm. So when the distance was 35mm, the temperature rising rate was higher and the temperature gradient was lower, the temperature distribution was more reasonable.Also, the mould would have a different temperature field when the water lines had a different diameter. This paper discussed the different temperature field of the die when adopting different diameter 8mm, 9mm and 10.5mm, The results showed that the isothermal layer was0~2mm, 2~4mm and 4-6mm when the diameter was 8mm, 9mm and 10.5mm separately. And when the diameter was 10.5mm, the average temperature rising rate of the cavity surface was 11.122°C/s, the temperature gradient was 10.975 "C/mm, and the temperature distribution was more reasonable than when the diameter of the water lines was 8mm and 9mm.