Design Of Pendulum Shaft Control System Of Lapping Machine For Rounded Diamond Cutting Tools

The diamond ultra-precision machining is an important part of ultra-precision machining. With the ultra-precision machine and stable machining environment, diamond ultra-precision machining can process super smooth surface, widely applied in filed of civil and national defense. The quality of diamond tools is an important factor which influences the machining quality. However our equipment is backward compared with international high sophisticated equipments. The price is expensive for cutting tool's import and the high level cutting tool is embargoed for us. So it will have great significance for us to develop high level lapping machine and its Control system.With the reference of domestic and national popular numerical control system and the consideration for lapping machine's concrete function demand, we propose an CNC system of upper and lower computerfor lapping machine's pendulum shaft axis.First, with the reference of domestic and national CNC system for lapping machine,'PC + controller'CNC system is proposed. PC machine adopts IPC and controller adopts UMAC controller. And designed for the system hardware .Secondly, the design of servo control system adopts three loop control system. And the error is reduced because the air static pressure shafting is directly driven by the DC torque motor. To improve the control performance of command tracking ability, the compound PID servo-control principle of feed-forward is put to use. The model of servo-control is carried out by MATLAB/Simulink, which proves that the feed-forward control has superiority.Next, this paper introduces the environment of making programs, including PEWIN, variables, commands, programs and the method of communication to UMAC by Pcomm.dll. Man-machine interface is designed and the method that how to realize the model is introduced in detail.Last, how to adjust the compound PID servo-control principle of feed-forward is introduced and the experiments are made. The experimental result indicated that the compound PID of feed-forward is consistent with the simulation result. And this servo-control principle can reduced the error remarkably and enhances the ability of the system trace command signal.