CNC machine tool is an important basic equipment of the machine tool manufacturing industry, so its development has been much concern. In recent years, China's machine tool manufacturing industry is facing the opportunity of the development of manufacturing equipment, but also to meet the pressure of market competition. From a technical point of view, to speed up the numerical control technology will be a key to solve the sustainable development of machine tool manufacturing industry. At present, the world's advanced manufacturing technology continues to rise, the application of ultra high speed cutting, ultra precision machining technology, the rapid development of flexible manufacturing systems and computer integrated system continues to mature, put forward higher requirements on the NC machining technology. CNC machine tools are developing in the following directions.
CNC machine tool is an important basic equipment of the machine tool manufacturing industry, so its development has been much concern. In recent years, China's machine tool manufacturing industry is facing the opportunity of the development of manufacturing equipment, but also to meet the pressure of market competition. From a technical point of view, to speed up the numerical control technology will be a key to solve the sustainable development of machine tool manufacturing industry. At present, the world's advanced manufacturing technology continues to rise, the application of ultra high speed cutting, ultra precision machining technology, the rapid development of flexible manufacturing systems and computer integrated system continues to mature, put forward higher requirements on the NC machining technology. CNC machine tools are developing in the following directions.
1 reliability maximization
The reliability of CNC machine tools has been the main concern of users. CNC system will use a higher degree of integration of the circuit chip, the use of large or ultra large scale dedicated and hybrid integrated circuits, in order to reduce the number of components to improve reliability. Through the software function of the hardware, in order to adapt to the requirements of various control functions, the modularization and standardization of hardware structure and the general body of the machine and the series, which not only improve the hardware production, and facilitate the organization of production and quality control. It also realizes the fault diagnosis and alarm of the hardware, software and all kinds of external devices through the automatic running diagnosis, on-line diagnosis, off-line diagnosis and so on. The alarm, timely troubleshooting; the use of fault-tolerant technology, using the "redundant" design to the important parts, in order to realize the fault self recovery; using a variety of testing, monitoring technology, production process, when the super knife loss, interference, power outages and other accidents, the corresponding automatic protection.
2 control system miniaturization
The miniaturization of CNC system is convenient for the combination of machine and electric equipment. At present, the main use of ultra large scale integrated components, multilayer printed circuit board, the use of three-dimensional installation method, so that electronic components can be high-density installation, a larger size of the system to reduce the occupied space. And the use of color LCD display model to replace the traditional cathode ray tube, will enable the further miniaturization of CNC operating system. Thus, the utility model can be conveniently installed on the machine tool equipment, which is more convenient for the operation of the numerical control machine tool.
3 intelligent
Modern CNC machine introduce the adaptive control technology, according to the changes of cutting conditions, automatically adjust the working parameters, which can keep the best working state in the process, so as to obtain high machining accuracy and small surface roughness, but also can improve the service life of equipment and tools of production efficiency. The system has the function of self diagnosis and self repair. In the whole working state, the system can diagnose and inspect the CNC system itself and all kinds of equipment connected with it. Once a fault occurs, immediately stop the use of such measures, and failure alarm, indicating the location of the fault, the reasons for. The fault module can also be automatically off the line, and the standby module is connected to ensure the requirements of the unmanned working environment. In order to achieve a higher requirement of fault diagnosis, the development trend is to use artificial intelligence expert diagnosis system.
4 NC programming automation
At present, CAD / CAM graphics interactive automatic programming has been applied more and more, and it is a new trend in the development of numerical control technology. It is the use of CAD drawing of the parts processing drawings, and then through the computer tool path data to calculate and post processing, thus automatically generate NC parts processing procedures, in order to achieve the integration of CAD and CAM. With the development of CIMS technology, the current and the emergence of automatic programming of CAD / CAPP / CAM integration, it is with the greatest difference between CAD / CAM system programming is the process parameters of the programming required is not necessary for the artificial participation, obtained directly from the database of CAPP in the system.
5 high speed, high accuracy
Speed and accuracy are two important indexes of NC machine tools, which are directly related to the processing efficiency and product quality. At present, the numerical control system uses the digit, the frequency higher processor, in order to enhance the system basic operation speed. At the same time, the use of very large scale integrated circuit and multi microprocessor structure, in order to improve the data processing ability of the system, that is to improve the speed and accuracy of interpolation operations. The linear servo motor is used to drive the worktable directly, and its high speed and dynamic response characteristics are quite superior. The feed forward control technique is used to reduce the tracking lag error, so as to improve the machining precision.
6 multi function
The knife is equipped with an automatic transfer mechanism (tool storage capacity of up to more than 100) of various types of machining center can realize milling, boring, drilling, turning, reaming, reaming, tapping and other processes on the same machine, modern CNC machine adopts multi spindle, multi body cutting, i.e. at the same time in different parts of a part of the cutting processing in different ways. The CNC system adopts multi CPU structure and hierarchical interrupt
