Design The Machine Structure And Control Software Of The NC Test-Bed Based On PMAC

This thesis is the project of Shaanxi Province Key Laboratory of NC Technique, using Motion Control Card and IPC for the controlling of the five axises X, Y, Z, A and B. It is an ONC test-bed which detects the displacement of numerical control by its displacement detecting device. It aims at all researchers and experimenters can sufficiently understand as well as master the controlling characteristics of numerical control process and Motion Control Card through this test-bed.Through the research of open-type NC system home and abroad, this thesis analyzes and contrasts several open modes and system structures of NCS. It finally adopts the"IPC+PMAC"mode to establish the test-bed. This design puts PMAC Motion Control Card and its development card into the controlling case and communicates with IPC through serial-port. Then, it matches AC servo motors, step motors, servo drivers, encoder and grating rulers to form a modular NC system.In the process of the designing of the mechanical structure of this test-bed, the ball screw assembly, roll linear guide way assembly and worn gear pair turntable are firstly main devices to calculated, checked and attached, as it can ensure the high precision and rigidity of the mechanical transformation devices, as well as fulfill the requirement of the NC system. Secondly, it selects electrical components through calculation, including AC servo motors, step motors, its servo drivers, encoders and grating rulers. Thirdly, basing on Windows Operating System, it establishes the software interface by Visual Basic. The motion program of the test-bed which is applied to carry out the acceleration and deceleration control, as well as linear and circular movement of the test-bed, has been developed by G code explanation program, M code explanation program and T code explanation program of PMAC.Through the detection and debug of this test-bed, the performance index of it has fulfilled the designing requirement.