On a special case of synthesis of metal turning process control system

Introduction. One of the widely accepted methods of the precision metal turning provided a fairly complex shape of the workpiece is the method of multiple repetitions of turning. The principle of this method is cutting an extra thin layer of the work material. At that, the required operating depth is obtained through the successive passes of the cutting tool along the workpiece. An essential fault of this method of complex parts processing is low efficiency due to the long processing time. Materials and Methods. The improvement of efficiency is possible through the introduction of new modern methods of the treatment process control. Modern approaches to the analysis and synthesis of the control systems of complex operating procedures based on the development of the synergetic concept of management could be used as such methods. A special feature of this approach is the identification and control of the inherent feedbacks stabilizing the treatment process. On the basis of the analysis conducted, the control that is a new nonlinear degenerative feedback is synthesized. Its task is to assure adequate quality and efficiency of the processing under the asymptotic stability of the required attractors. Research Results. A fundamentally new mathematical model considering non-linear processes of the force changes is developed to simulate the system and allowance for the effect of the engine parameters. The analysis of the dynamics of the metal turning control system with the evaluation of the process quality is carried out. A synergistic approach to the construction of the optimal production control system considering the interconnectivity of the actuators providing the workpiece rotation and supply is used. The analysis of the synthesized system dynamics with the comparative evaluation of the quality growth is conducted. Discussion and Conclusions. The synthesized synergetic control law changes fundamentally the properties of the metal turning control system. A comparative analysis of the obtained dependences allows observing a substantial increase in the processing accuracy. At that, a synthesized system control asymptotically approaches the deviation of the allowance to the value specified as one of the constants on the control channel of the feed velocity.