Techniques In Research And Development Of Mirror Milling Equipment Based On UMAC

As the key components of High-end equipment,such as load rocket,missile and large aircraft,large thin-walled piece has the characteristics of low stiffness,small thickness,large size,irregular shape and high material removal rate,which is a major problem in the field of processing and manufacturing.The traditional machining theory and method cannot satisfy the requirements of high efficiency and high quality for milling large thin-walled structures.Single point support is adopted in mirror milling,which ensures the local stiffness of machining points at all times,and achieves high accuracy and surface quality.In this paper,based on the equipment of mirror image processing,a numerical control system was designed,and the problem of constant force control at the support end of the mirror image processing was deeply studied.The electrical control system and servo control system were designed based on its technical indicators and functional requirements.The motion program for the upper system and the PLC program were developed based on the design idea of "IPC+UMAC motion controller".The PID parameters and feedforward parameters were debugged by Pewin32Pro2 software to improve dynamic and static characteristics.Using the laser interferometer to detect the positioning error of each axis and compensate the error.The hardware platform for the CNC system of the mirror processing equipment finally set up.Proposing an online trajectory correction position/force control strategy based on fuzzy adaptive PID block based on the strain sensor and eddy current sensor array at the end of the vector measurement module.In this method,the force information fed back by strain sensor was used to correct the force of the predicted position so as to achieve a constant force.Validating the position/force control strategy,conducting step response experiments on the mirror processing equipment and acquired the system model,and built simulation diagram based on fuzzy adaptive PID controller in the Simulink.The control algorithm was programmed to perform the cutting experiment on the mirror processing equipment.The experimental results were combined with simulation data to achieve the ideal force and position tracking effect,which was suitable for the mirror processing system.