The numerical control system is realized by the PC through the form of software programming. Therefore, it has high requirements for the comprehensive index of controlling the computer's computing speed, memory capacity and hard disk space. In addition, the real-time requirements of multi-axis motion control are considered. And the harsh environment (such as the presence of multiple sources of interference). Based on the above factors, the host is equipped with Advantech IPC610 industrial control computer, the host model is PCA-6147; the CPU is 80486, with coprocessor, system clock 75MHz, memory 4MB, and equipped with 48CM standard chassis, 36CM LCD display and disk drive. The system also expands a special function I/O board developed by itself. The board has 16 input/output interfaces. In order to meet the requirements of high-speed machining of springs, 16 outputs are used for analog signal interface between CNC system and AC servo drive, mainly for camshaft, rotary shaft and servo coil axle. And the input of the control pulse and direction signal of the four motion axes of the wire spool; the other 16 inputs are used for various detection signals in the field, pulse and direction signals generated by the MDI device, and pulses output by the position feedback components (photoelectric encoders) of the respective axes. The signals are transmitted between the state control signals and the IPC during spring processing by the control panel of the numerical control system. The direction of the output signal is discriminated. We have developed the self-aligning circuit and integrated it into the original special function I/O board, which greatly improves the anti-interference of the whole CNC system and simplifies the system. hardware design. The I/O board is directly inserted into the ISA bus slot of the industrial computer, and other devices (such as MDI equipment, servo control system, and position detection components of each axis) are connected to complete the software-based CNC system PC. Semi-closed loop servo control with peripherals (the block diagram of the system hardware function is shown in Figure 5). Put into production. The machine adopts AC servo control technology. The CNC system adopts industrial computer control with strong anti-interference ability, and adopts technical measures such as shielding and isolation to eliminate the possible interference of the servo drive unit to the CNC system. The system is relatively bad at the scene. It can also work reliably in the environment. After more than two years of operation, it proves that the stability of the system is good, the processed spring has high precision, good repeatability, and has good performance/price ratio. It has good practical and popular value in the spring manufacturing industry. Background process software structure task. The number of foreground programs should not be too much. In each interpolation cycle, it must ensure that the background program occupies enough basic tasks such as interpolation preparation and CPU time of scheduling to ensure smooth operation of the system. The main basis of the principle of the foreground program division is the coupling relationship of the modules in the foreground, and the relationship is closely put together. The structure of the front-end and interrupt hybrid software is shown in Figure 4. (Finish)
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