【摘要】 建立了金属板件等离子体弧柔性成形的热过程数学模型 ,计算并分析了成形过程中板材的热物理参数、几何尺寸、等离子体弧扫描速度、冷却条件等因素对成形零件的温度场分布的影响规律。研究发现 :在一定的成形条件下 ,可实现成形的板材厚度存在极限值 ;在保证板材表面温度足够高的前提下 ,采用较高的扫描速度仍可以获得较好的成形效果 ,而引入冷源 ,可更好地控制板件最终形状。更多还原

【Abstract】 A mathematical model on heat transfer of flexible forming of sheet metal using a plasma arc was established. Influence rules of some factors on formed piece temperature field distribution were calculated and analyzed in course of forming, such as the thermo physical parameters, geometrical dimensions, scanning speeds of plasma arc and cooling conditions and so on. The research shows there exists a forming thickness extreme for sheet metal under a specific condition. Having assured that the temperature of sheet metal surface is high enough, better forming results can also be achieved by using relatively higher scanning speed. On the other hand, the final shape of sheet metal can be better controlled by using cooling system.更多还原