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At that time; international leading production skills continue to swell; the use of ultra-high-speed cutting, ultra-fine machining and other skills; the rapid development of flexible production systems and the continuous development of the computer integration system; put forward higher requirements for CNC machining skills. The machine tool is moving in the following directions. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. High speed, high precision speed and precision are two important goals of CNC machine tools; it is directly related to processing power and product quality. At that time; the numerical control system uses a processor with a higher number of bits and frequency; Together; use the super-planned integrated circuit and multi-microprocessor layout; to improve the data processing ability of the system; that is, to improve the speed and accuracy of the interpolation operation, and to select the linear servo feed method of the linear motor directly driving the machine table; Its high speed and dynamic response characteristics are appropriate. Choose feed-forward control skills; make the pursuit of lag errors greatly reduced.
In order to get used to the requirements of ultra-high-speed machining; CNC machine tools use the layout method of combining the spindle motor and the machine tool spindle; the integration of the variable frequency motor and the machine tool spindle is completed; the bearings of the spindle motor are selected from magnetic bearings, liquid dynamic pressure bearings or ceramic rolling bearings. At the time; ceramic tools and diamond coated tools have been used.
2. Multi-function with various types of machining intermediates with active tool change organization (tool magazine capacity up to 100 or more); can perform milling, boring, drilling, turning, reaming, reaming, and attack on the same machine Threads and other processes; modern CNC machine tools also use multi-spindle, polyhedral cutting; that is, different parts of a part of the different parts of the cutting process. The CNC system because of the choice of multi-CPU layout and hierarchical suspension control; It is possible to carry out part processing and programming together on one machine; complete the so-called "foreground processing; background modification". In order to get used to the requirements of flexible production system and computer integration system; CNC system has long-distance serial interface; Networking; complete data communication between CNC machine tools; can also directly control multiple CNC machine tools.
3. Intelligent modern CNC machine tools will introduce self-customized control skills; change according to cutting conditions; actively adjust operating parameters; enable the best working conditions during the machining process; then get higher machining accuracy and smaller surface roughness; It can also improve the service life of the tool and the production power of the equipment. It has self-diagnosis and self-correction function; in the whole operation condition; the system can self-diagnose and view the CNC system itself and various devices connected with it at any time. Immediately choose to stop and other methods; and carry out fault alarms; prompt the location of the problem, the cause, etc. It can also take the initiative to make the faulty module offline; and connect the standby module; to ensure the needs of the unmanned operating environment. To complete higher The need for diagnosis of the disease; the trend is to use artificial intelligence to teach the diagnosis system.
4. The NC programming initiative followed the development of the application skills of the computer; at that time, CAD/CAM graphical interactive active programming has been used more; it is a new trend of CNC skills development. It is a CAD processing of parts processing drawings; The tool track data is calculated and post-processed; then the NC part processing program is actively generated; the integration of CAD and CAM is completed. The CIMS skills are developed; at the time, the fully active programming method of CAD/CAPP/CAM integration is presented; The biggest difference between it and the CAD/CAM system programming is that the processing parameters required for its programming need not be participated by humans; it is obtained directly from the CAPP database in the system.
5. Reliability Maximizes the reliability of CNC machine tools has always been the primary goal of users. The CNC system will use higher integration of circuit chips; the use of large-scale planning and special-purpose hybrid integrated circuits; to reduce the number of components; To improve reliability. After hardware function software; to get used to the needs of various control functions; together with the hardware layout of the machine body modularization, standardization and generalization and serialization; so that the progress of hardware production batch; Quality control. It also initiates diagnosis, online diagnosis, offline diagnosis and other confirmation procedures through active operation; completes the diagnosis and alarm of hardware, software and various external devices in the system. Use alarm prompts; eliminate problems in time, use fault-tolerant skills Select "redundant" depiction of important components; to complete self-recovery, use various tests and monitoring skills; when producing various accidents such as overtravel, knife damage, disturbance, power failure, etc.;
6. The miniaturization of the control system is small, and it is easy to combine the machine and the electric equipment. At that time, the super-planning integrated components and multi-layer printed circuit boards are selected firstly; the three-dimensional device method is selected; the electronic components can be made with high-density devices; The system occupies space. The new colorful liquid crystal thin display replaces the traditional cathode ray tube; the CNC operating system will be further miniaturized. This can be easily installed on the machine tool; it is more convenient for the operation of the CNC machine.
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Source: Bearing network time: 2013-05-31