Research On Key Technology Of Radome Precision Grinding Machine

Radome is a key component of antennas system of ultrahigh speed aircraft.To satisfy its electronic properties,a scheme to compensate the permittivity's bias through adjusting the distribution of radome geometry thickness is proposed by Dalian University of Technology. Radome inner surface precision grinding machine tool was developed successfully.However, the first and second generations'grinding control system,spindle system,tool presetting system and data processing pattern cannot meet the higher efficiency and accuracy demands. Therefore,it is necessary to develop a new radome precision grinding machine based on the technology available.According to the machining accuracy(≤5μm) and speed of the new precision grinding machine,the servo system of the machine is designed.To enhance the grinding efficiency and guarantee machining accuracy,the spindle system with slender geometric features is analyzed and its construction is optimized.A numerical analysis is given through ANSYS.Based on the architecture of dual-station for both measuring and grinding on one machine,a dedicated double-CPU CNC system of "Galil controller+IPC" is constructed. The problem was solved that the original system cannot make real-time adjustment of feeding rate.By adopting AE,the problem of precision tool-presetting during grinding was settled, which is a possible technology for research of grinding monitoring.The radome measuring system was designed through high speed position latch of Galil controller and measuring path is optimized.The interface software for master machine and control program for slave machine were developed through VC.A high precision and high speed data processing method is proposed.Compared to the original data processing method,this one got more satisfying results in processing time and accuracy.Combined with the characteristics of curvature in radome generatrix,the calculation method of grinding path is improved.This new method can solve the problem that the CNC program generated by equally spaced sectional ring-cutting method is too long.To meet the high processing accuracy demands,a controller with fuzzy self-tuning PID parameters was designed and simulated with the application of fuzzy controller for parameter adjustment in machine control system. System joint test and accuracy test were carried out.Accuracy and repeatability of the radome measurement system were analyzed and detected.The results show that the measure system's repeatability and precision is high.Machine control accuracy was detected by Laser Interferometer and the AE tool-presetting experiment was carried out.