Modeling the Process of Controlling the Dynamics of a Longitudinal Cutting Mill

The paper considers the issues of paper rewinding processes and compliance with technological parameters to ensure the quality of this process. A review of the components of the modern elemental mechanical and electronic base for the design and creation of machines that perform the rewinding processes of various materials and paper in particular is carried out. Attention is paid to the specific features of using the programmable logic controllers and electric drives for the design of rewinding machines. The kinetics of electrical (voltage and current) and mechanical (rotor angular velocity and shaft torque) of the PRS-501 machine tool were experimentally investigated in the transient technological processes of acceleration and braking when switching from refueling to operating speed Based on the previously obtained dynamic model, a control system is proposed, developed on the basis of SIEMENS SIMATIC S7-300 and SIEMENS SINAMICS DCM electric drive. High reliability of the correlation of angular velocity from armature voltage (R2 = 0.8588) and shaft torque from consumption current (R2 = 0.8337) in acceleration mode was revealed. In braking mode, respectively, R2 = 0.9117 and R2 = 0.8865. The mechanical parameters of the strength of the paper being rewound and the dependence between the strength index and the mechanical parameters of the unwinding unit to maintain the tension specified for high-quality rewinding were investigated. Statistical data on the strength index in the longitudinal and transverse directions for one grade of paper were analyzed. A tension control system for the unwinding motor based on a PID controller was proposed. The mechanical properties of the paper in the longitudinal and transverse directions were studied and show that the basic strength condition σtechn< [σ], and, respectively Mt < [M] is fulfilled in the entire range of their variation. The control system proposes a concept of limiting the operating torque to ensure tension instead of direct torque control to ensure a safe rewinding process in the event of a web break.