Research On Worm Tester Control System With Double Axles Linkage

With theoretical research of toroidal worm being developing in depth, the analysis and detection of the manufacturing error in toroidal worm draws more and more attention. Most of manufacturers can only identify quality of product by detecting spots on gear surface rather than detecting manufacturing error. The new measurement strategy of worm tester system with double axles linkage is introduced in this paper, which can detect the manufacturing errors in toroidal worm efficiently.Based on fabricated test principle that measurement is in accordance with machining, the proposed worm tester control system with two coupling axles establishs a colsed-loop system with ARM-based motion control circuit and FPGA-based signal detection circuit to control simutaneously both objective worm and measuring head so as to detect the manufacturing error of toroidal worm.The main research results are listed below:The new measurement strategy of worm tester system with double axles linkage is forwarded. It can avoid additional error generated by conventional coupling method and has less calculated quantities and real time detection compared to tri-ordinate measuring machine.Some innovations in high precision positioning technology are made in this design. Based on low cost of motor-drived mechanical workbench, the high precision positioning can be achieved with time segment technology. The time segment technology is realized by software.The hardware circuit design consists of ARM-based motion control circuit and FPGA-based signal detection circuit, which solve the question about how to reverse the trend that high-speed data transmission leads to considerable capital cost increase.Experiments on worm tester control system with double axles linkage are designed as well to verify its performance. It includes precision positioning experiment and testing worm experiment. With linear compensation from calibrations of laser interferometer and control system, linear positioning accuracy can reach±2μm and angle positioning accuracy can reach±3" as well in precision positioning experiment. According to mathematical model of the manufacturing errors in toroidal worm, Coordinate system is established and calibrated, and then Angle between worm and measurement head are measured accurately, which will be uploaded to computer timely.