设计并搭建了一套基于PTA(Plasma Transferred Arc)的粉末增材制造控制系统,系统分为热源控制和运动控制两部分。热源控制部分采用PLC为控制核心,结合威纶通触摸屏实现热源组成部分的时序控制,并设计参数设置模块。通过添加子程序,实现热源两种控制模式(触控模式和联控模式)的切换,并且可以在触摸屏中设置两种控制模式下各时序时间间隔;运动控制部分以Arduino MEGA 2560运动控制卡为控制核心,通过建模、分层生成焊枪运动G代码,将G代码编译为步进电机驱动器的脉冲信号,驱动三轴滑台上的步进电机转动,实现等离子焊枪的三维运动;通过旋转编码器建立热源与运动之间的联系,实现增材制造过程的一体化控制。最后通过工艺试验验证了该增材制造过程控制系统的可行性及可靠性。
According to the demand and development trend of industrial production,a set of powder additive manufacturing control system based on PTA（Plasma Transferred Arc） is designed and built. The system is divided into two parts:heat source control and motion control. In the heat source control part,PLC is used as the control core,and the time sequence control of the heat source component is realized by combining with the touch screen of Winton,and the parameter setting module is designed. By adding subroutines, the switching between the two control modes of heat source can be realized,and the time intervals of the two control modes can be set in the touch screen. In the motion control part,Arduino MEGA 2560 motion control card is used as the control core. Through modeling and layered generation of welding gun motion G code,the G code is compiled into the pulse signal of stepping motor driver,which drives the stepping motor on the three-axis sliding table to rotate and realize the three-dimensional motion of plasma welding gun. The connection between heat source and motion is established by rotary encoder to realize the integrated control of additive manufacturing process. Finally,the feasibility and reliability of the additive manufacturing process control system are verified by process test.
PTApowder additive manufacturingPLCintegrated control