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利用自行设计的连续半固态扩展挤压成形装置制备6201铝合金管材,并采用数值模拟研究此过程的温度场和流场分布规律。结果表明:辊?靴型腔内合金的温度从入口到出口处逐渐降低,等温线向轧辊侧偏移,金属流动速度沿工作辊表面向辊靴表面依次递减。在扩展挤压模具内,合金呈放射状填充到模具中,温度由入口到出口处逐渐降低,且模具扩展腔中心的温度高于壁面的温度。分流孔中心位置和焊合部位对应的成形管材截面流线密集,此处相应的金属硬度也高,在两者之间出现8条流线的舒缓过渡带。为制备表面质量良好的6201铝合金管材,合理的浇注温度为750～780°C。
The 6201 aluminum alloy pipe was prepared by a continuous semi-solid expanded extrusion molding machine designed by ourselves. The temperature field and flow field distribution in this process were studied by numerical simulation. The results show that the temperature of the alloy in the roller-shoe cavity gradually decreases from the entrance to the exit, the isotherm shifts to the roll side, and the metal flow velocity decreases gradually along the surface of the work roll toward the surface of the roll shoe. In the extended extrusion die, the alloy is radially filled into the mold, the temperature gradually decreases from the entrance to the exit, and the temperature in the center of the mold expansion cavity is higher than the temperature of the wall. The center of the shunt hole and the welded part correspond to the dense streamline of the profiled pipe section, where the corresponding metal hardness is also high, and a soothing transition zone of 8 streamlines appears between the two. In order to prepare 6201 aluminum alloy tube with good surface quality, reasonable pouring temperature is 750 ~ 780 ° C.