After the CNC system receives the signal of the press action stroke switch, it sends a pulse signal, and the stepper motor drives the power supply to drive the stepper motor to realize the retreat of the back gauge. After the mountain program is set, the back gauge is retracted and the delay is waiting for blanking. . The system uses the press action stroke switch to count the shearing work. If the number of shears has arrived, the CNC system moves the back gauge to the next shear position in the cutting order to cut. The rear gauge travel switch is used for the extreme position protection of the rear gauge. The hardware structure of the CNC system and its characteristics The functional requirements of the CNC system hardware are to control the movement of the stepper motor, to achieve accurate positioning of the back gauge and to allow for the return and reset during the cutting process. Store memory and query functions. By taking some anti-interference measures, the reliability of the system is improved.

An AC noise filter is added to the AC side of the regulated power supply, and a shield layer is added between the primary and secondary of the power transformer, and the wiring of the control and the drive line are independent of each other. All the input and output lines of the numerical control system are photoelectrically isolated by photoelectric interference devices. Set the power-down protection circuit to ensure that the relevant data of the input and the current position of the back gauge are not lost in case of power failure and shutdown. The software design system software of the numerical control system is mainly composed of the main program keyboard interrupt service program cutting interrupt service program and the stepping motor control subroutine. In the software design, in addition to requiring the program to achieve the predetermined functions, software anti-interference measures such as instruction redundancy software trap and input signal re-sampling are also adopted to further ensure the reliability of the numerical control system. The main program is mainly to complete the initialization of hardware and software and display the status information of the CNC system. The keyboard interrupt service program is the core of the numerical control system. Its main function is to interpret the keyboard operation, call the corresponding function module, complete the predetermined task, and give the execution result through the display mode. In order to reduce the number of buttons and not make the keyboard too large, the system performs a predetermined task through a sequence of buttons. In order to make the keyboard program clear and readable, the program firstly establishes the key code key value conversion table status address table status table and subroutine address table and so on according to the functional requirements of the numerical control system, and then uses the table lookup method to realize the function module. transfer. (Finish)

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