论文部分内容阅读
介绍一种基于等离子弧熔覆的薄壁件快速成形工艺,通过数值模拟与实验相结合的方法研究不同的热输入与散热条件下,薄壁件成形中的温度分布规律及控制方法。研究结果表明:在成形中,当等离子弧功率不变时,薄壁件的温度会越来越高,导致因过度熔化而坍塌;随着层高的增加,逐步减小等离子弧功率,可以明显减少热输入,改善过度流淌等缺陷,但等离子弧功率过低时会导致无法将填充金属丝熔化而产生夹丝。提出一种减小等离子弧功率与跟随式直接水冷相结合的成形温度控制方式,有效控制了成形过程中薄壁件的整体温升,避免了薄壁件的坍塌、夹丝等缺陷,保证了成形质量。
A rapid prototyping process of thin-walled parts based on plasma arc cladding is introduced. By means of numerical simulation and experiments, the temperature distribution and control methods of thin-walled parts under different heat input and heat dissipation conditions are studied. The results show that when the power of plasma arc is constant, the temperature of thin-walled parts will be higher and higher, leading to collapse due to over-melting. As the layer height increases, the power of the plasma arc will be gradually reduced, which can be obviously Reduce heat input, improve over-flow and other defects, but the plasma arc power is too low will lead to fill the wire can not melt the resulting wire clip. A control method of forming temperature is proposed to reduce the plasma arc power and the direct type direct water cooling, which can effectively control the temperature rise of the thin-walled parts during the forming process and avoid the defects such as collapse and chipping of the thin-walled parts, Forming quality.