Research On Tracking And Realization Of Arc Additive Forming Motion Control

Wire Arc Additive Manufacture(WA-AM)uses computer-aided design of threedimensional coordinates,rational planning of paths,depositing deposited metal layers,and finally obtaining three-dimensional solid workpieces,whitch has the advantages of high material utilization,short production cycle,low manufacturing cost,good compactness,uniform material composition,good metallurgical performance and excellent mechanical properties.Recently,most scholars are devoted to studying the manufacturing process of arc additive materials.The research on arc additive equipment is in the stage of single heat source,and most of them are used for the molding of small parts.This article designs an intelligent WA-AM control system bases on the multi-heat source vertical additive manufacturing equipment,aims to complete the planning and realization of additive manufacturing trajectory,and meeting the requirements of additive process.The control system implements hierarchical management mode,including upper computer,human machine interface monitoring,lower machine PLC control and servo motor to achieve trajectory scanning.Firstly,it completes the overall design and hardware selection of WA-AM intelligent control system.According to the requirements and functions of the control system,it designs lower machine with the Inovance AM600 medium PLC as the core controller and the corresponding servo system,upper computer and human machine interface to realize layered and hierarchical management,and complete auto forming of multi-heat source arc addition.Secondly,the process parameters that need to be considered and controlled in the additive manufacturing process are clearly defined,including setting the appropriate bead spacing and solder layer height,controlling the solder joint temperature and the deposition speed to be stable within the allowable error range,and completing the single-layer scanning algorithm.Finally,the WA-AM intelligent control software system is designed.The upper computer software has a three-tier structure of user layer,control layer,and storage layer.It completes the functions of login verification,information monitoring,motion control,and data storage.The human machine interfaces with good human-computer interaction to achieve operator-level control of the control system.The lower computer software system optimizes the trajectory scanning algorithm,satisfies the welding process control requirements,and realizes three work modes: human host auxiliary,human auxiliary machine main,and man-machine coordination.Based on the WA-AM intelligent control system,the simulation of forming parts is carried out to verify the controllability and stability of the control system.After data analysis,it is found that the forming accuracy meets the requirements and the welding speed error is small,which meets the molding process requirements.