Main functions of modern numerical control system.
(1) axis control can control 3, 4 and 5 axes simultaneously. It can achieve higher cutting speed and machining quality.
(2) Tool Offset Compensation Modern CNC systems often have the function of tool radius compensation in three-dimensional straight lines.
(3) The programming function system provides some programming functions. Usually, the color graphic display terminal of the system can be used to manually compile the processing program of plane contour parts composed of straight lines and circular arcs, and the system is equipped with software to automatically calculate the intersection and tangent points of contours.
(4) Parallel operating system can realize two working modes in parallel: machine tool control mode and programming mode.
When the system controls the machine tool to process parts, the operator can complete the above manual programming work with the keyboard at the same time, or input external programs or edit and modify existing programs through the data transmission interface. When the machine tool is machining, the graphic display terminal can simulate the execution of another machining program at the same time for inspection and editing.
(5) Tool Management and Monitoring Modern CNC machine tools are developing to machining centers. Usually, milling machines and boring machines have tool libraries for dozens of tools, and turning centers also have tool libraries. Numerical control system has the function of controlling and managing tool magazine. Tool replacement is an automatic tool replacement on the processing machine tool controlled by the numerical control system according to the program.
(6) The feed speed control performance of the high-speed and low-speed feed control system for machine tool moving parts is an important performance index of the numerical control system. Modern numerical control system can control the cutting motion of machine tools at a fairly high feed rate in a very short distance. This is very beneficial to the machining of curved surfaces, which can greatly shorten the machining time, especially for the transition area with large curvature change, and still obtain good machining quality.
(7) The electronic contact alignment system provides three-dimensional measuring contacts (similar to measuring probes), which is very convenient for aligning workpieces.
(8) Automatic generation of physical measurement and processing program Physical objects (samples to be copied) can be scanned and measured with the above-mentioned three-dimensional electric probe. The system automatically collects the data of measuring points, and the distance between points is related to the scanning speed. Scanning point data automatically generates a linear interpolation NC program through the interface, which can be executed without any post-processing.
(9) The execution of external programming and DNC operating system are usually equipped with standardized data communication interfaces, which can accept programs transmitted from outside, such as machining programs output by CAD/CAM system. For short programs, it can be stored in the warehouse; Long programs for machining complex surfaces can be input into the system in blocks and executed synchronously. This ensures that the system can adapt to the DNC operation mode controlled and managed by other computers.
(10) Portable electronic manual manipulator system usually provides portable electronic manual manipulator. The operator can use it to sensitively adjust the movement of the moving parts of the machine tool in the clearest and most convenient place, and its control range is 0.02 ~ 20 mm