Research Of Essential Technologies Of The CNC System Used On The All-electric Injection Molding Machine

Since the birth of plastic injection molding machines at the1950th, plastic productsmade with the help of this kind of machine have taken up more than80percent of the totaloutput. At the meantime, the manufacturing of the equipment itself is still growing innowadays. With the increasing attention on the global energy consumption and theawareness of environmental protection, all-electric injection molding machine which ischaracterized by its advantages of energy-saving, high-precision and high-speed stabilityhas gradually drawn the attention in this industry. While in the field of control system ofinjection molding machine, which is significant in both technology and economic benefits,China does not have the capability of independent research and development.To solve this problem, this project tries to breach a number of fundamental issues.Based on the ‘HNC-8’ CNC systems, a special control system was developed, which canbe used to complete the control of all-electric injection molding machine, while thisdissertation mainly focuses on the clamping mechanism and barrel heating controlmodule.Began with the analysis of mechanical characteristics, a software has been developedwith the ideology of State Machine. Regarding the temperature control, with the help offuzzy-PID control and simple decoupling control algorithm, the results have been provenbetter than the traditional PID method. Moreover, a new PWM algorithm which canprovide even output in the time domain has been worked out. It has been verified that thecontrol system which was built in this project can meet the basic requirements of theall-electric injection molding machine.