Control system of inputting part screw of plastic extruder internal screw based on PLC

LI Guang, YANG Tie-niu, CHANG Ming-qing, WANG Xiao-jun

(School of Mechanical and Electrical Engineering, Wuyi University, Jiangmen 529020, China)

Abstract: Aiming at the problems of the general machine tool′s low efficiency to manufacture inputting part screw of plastic extruder and the screw cannot be proper motion processed when screw pitch over 500mm, the open system technology developed by touch screen, PLC and its location unit were applied to develop efficient CNC special purpose milling machine. After the analysis of the theoretical equation of internal thread and existing internal screw machining process, the relationship between each axis to internal screw processing was established. A method was presented to process internal screw and its control system had been proposed, by taking advantage of touch screen MT8000 from WEINWIEW company, programmable logic controller FP2 from Panasonic company and its interpolation type location unit. During the research, the feasibility and efficiency of this special machine were evaluated in theory and the control system was tested. The results indicate that the efficiency of internal screw processing is increased by more than 25%, satisfying expecting demand. Also, this machine designs a friendly operating interface, which will be easy learned by new workers.