Research On Collaborative Control Method Of Monitoring Platform For Selective Laser Melting Forming

It is an effective way to realize intelligent additive manufacturing to improve the defects in selective laser melting(SLM)printing process by on-line monitoring.At present,the on-line monitoring experiments of SLM printing process at home and abroad are limited by the narrow forming chamber environment,and it is difficult to build the monitoring platform due to the influence of laser light,scraper movement and glass window filtering of forming chamber during the printing process.As a result,problems such as low acquisition accuracy,multi-angle information and multi-layer printing molten pool information cannot be collected appear in the signal acquisition of the sensor.These problems affect the further exploration of SLM printing process mechanism.Therefore,using motor control,communication and other technologies to achieve an automatic SLM monitoring platform,to improve the monitoring efficiency has a very important value.(1)By investigating the platform construction methods in the field of SLM monitoring at home and abroad and analyzing the factors affecting the platform construction,this paper proposes and develops an off-axis monitoring platform that installs multi-motor drive in the molding cavity of the printing equipment and cooperates with the equipment on the basis of reducing the forming area of the original SLM equipment,and designs the motion timing of the monitoring platform and the SLM equipment according to the operation logic of the SLM printing process.(2)The paper carries out theoretical analysis,simulation verification,performance optimization and physical test on the realization of the monitoring platform.Firstly,the feasibility of cooperative control and the operation defects of the stepper motor control system in the monitoring platform are analyzed by building SIMULINK and ADAMS co-simulation method.Then,a variable universe fuzzy control algorithm is proposed according to the operation defects of the stepper motor.The speed curve of the monitoring platform in the coordinated motion with the SLM equipment is optimized,and the feasibility of the fuzzy algorithm is verified by simulation and experiment.(3)In this paper,a collaborative control system with STM32F407 single-chip microcomputer as the control core is built,which realizes TCP communication with SLM equipment,stepper motor control under fuzzy algorithm optimization,safety limit design and serial communication.The monitoring platform was tested experimentally.Finally,the upper computer display interface suitable for the monitoring platform is designed by using LABVIEW software,and the operation of the monitoring platform,the printing status of SLM equipment and the control of stepping motor are personalized.