Limited numerical control technology in the era of four seas Production and sales of digital cutting machines, gantry CNC cutting machines, CNC intersecting line cutting machines, CNC flame cutting machines, CNC plasma cutting machines, cantilever CNC cutting machines, portable CNC cutting machines, desktop CNC cutting machines, desktop advertising CNC cutting machines and CNC systems, acting as import and domestic nesting software, imported and domestic servo motors and reduction Speed device and CNC system upgrade and transformation, agent domestic and imported ordinary machine plasma cutting power supply and similar laser fine plasma cutting power supply and plasma power related supporting products. Welcome customers to inquire! In the process of mechanical processing, the commonly used methods of plate cutting are manual cutting, semi-automatic cutting machine cutting and CNC cutting machine cutting. Manual cutting is flexible and convenient, but the quality of manual cutting is poor, the size error is large, the material waste is large, the subsequent processing workload is large, and the labor conditions are bad, and the production efficiency is low. In the semi-automatic cutting machine, the profile cutting machine has better cutting quality. Because of the use of cutting die, it is not suitable for single piece, small batch and large workpiece cutting. Although other types of semi-automatic cutting machines reduce the labor intensity of workers, their functions are simple and only suitable for cutting parts with regular shapes. Compared with manual and semi-automatic cutting mode, CNC cutting can effectively improve the efficiency and quality of plate cutting and reduce the labor intensity of operators. At present, manual cutting and semi-automatic cutting are widely used in some small and medium-sized enterprises and even in some large enterprises. CNC technology and CNC machine toolsIt is the foundation of manufacturing modernization and an important embodiment of a country's comprehensive national strength. In the process of China's transformation from a big manufacturing country to a powerful manufacturing country, it is of great significance to vigorously develop CNC technology. In recent years, on the basis of introducing and digesting foreign numerical control technology, China has produced CNC system and CNC machine tool with copyright, but the CNC system above middle and high grade is still mainly imported products. Studying the current status and future development direction of CNC machine tools and technology will help to develop medium and high-grade CNC products and further expand the market share of CNC machine tools The forehead plays an important role. 1. The hardware technology of numerical control system develops rapidly with the rapid development of integrated circuit and computer technology, it injects new vitality into the updating of CNC hardware technology. Modern CNC system generally adopts VLSI, ASIC and DSP technology. Surface mount (SMT) and three dimensional high density (three dimensional high density) technology are widely used in electrical assembly, which greatly improves the reliability of the system. High speed and high performance storage technologies, such as flash memory and PCMCIA card, are very convenient for users. Thin film transistor liquid crystal display (TFTLCD) technology makes display devices tend to be flat, which is more convenient for Mechatronics installation and improves human-machine interface. As the core of CNC system, the processor is widely used "bit above"The high-speed RISC CPU ensures high-speed and high-precision CNC machining. Taking FANUC 16i / 18i and 160i / 180i in Japan as examples, ultra-small and ultra-thin controllers have been formed. The main control board is only the size of a business card, and the main processor is Pentium chip. CNC and servo adopt 50M / s high speed serial bus. The I / O module is connected with optical cable and distributed configuration, which is convenient for mechatronics. In terms of communication, PCMCIA memory card is used to communicate with external computer, or modem is used to communicate with man-machine through telephone. The hardware of embedded system is expected to be more standardized. The development cost of CNC system will also be reduced. 2. Open architecture has been discussed for many years, but it should be noted that there is no consistent definition of open architecture. Some users think that open means that they can accept the local communication protocol; others think that open means that all controllers have identical operation interfaces; for machine tool application spiral tube forming machine engineers, open means that there are standard I / O interfaces for turret movement, sensors and logic control; For research engineers at large companies and universities, open architecture means that all of this comes from building blocks that are ready to use. Due to pressure from end users and integrators (machine tool plants), the development of open architecture is moving forward and will continue. At present, a positive achievement is the CN based on PCC. PC based. Some famous CNC manufacturers in the world have launched PC based CNC system, such as FANUC 160 / 180 of FANUC company, Siemens 840Di of Siemens company and hydraulic swing beam shear FAGOR 8070 of FAGOR company. Due to the use of industrial PC and desktop operating system windows, DOS, etc., its rich software and hardware resources bring a lot of convenience to users. It should be noted that in the strong real-time environment of NC machining, the use of commercial operating systems such as win, DOS has not been fully recognized by the industry. In theory, it has not been proved to be superior to the existing traditional CNC. In response to the future development of open CNC, China has implemented the national standard GB / t18759.1 since 2003. Open CNC (ONC) can be divided into three levels according to its openness. The first level is the communication interface and protocol with configurable function and open man-machine interface. The second level is that the control device is allowed to be replaced under a definite and fixed topology, and specific modules in the NC core are added to meet the special requirements of customers. The third level is a completely variable and fully open control device with topological structure. At present, the first level of the three levels is basically achieved. The future development mainly focuses on the second level goal, and there is still a long way to go. 3. Real time operating system enters CNC strictly speaking, CNC control softwareIt contains the idea of real-time operating system, such as task scheduling, memory management, interrupt processing, etc., but this technology is implicit and mixed with CNC applications such as interpolation, servo, decoding, etc. Each CNC system is unique and opaque. This situation brings a lot of inconvenience to end users and system integrators. Nowadays, the voice of open CNC is rising day by day. It is natural to study the application of real-time operating system in CNC software. In particular, the rapid development of embedded real-time operating system technology will have a revolutionary impact on the development of CNC control software. Choosing a suitable commercial embedded real-time operating system, the interpolation, servo, decoding, data processing and other numerical control application software "hang up", and finally transplant to a hardware environment to form a numerical control system, that is, personalized CNC system, which will be the main direction of open CNC. RT Linux is expected to become the mainstream of CNC real-time operating system in the future. "In addition to the advantages of powerful function, high performance, good stability and open source code, the biggest feature of Linux kernel is that the Linux kernel has a very good structure, that is, users can configure or tailor the kernel according to the special system requirements, and this feature just meets the difference needs of open CNC applications. 4. Fieldbus technology has been widely used fieldbus is essentially a low-grade product in industrial control network. becauseCommunication for the underlying device has the following characteristics. 1) The bad communication environment may be affected by temperature, humidity, dust, voltage fluctuation, mechanical vibration and electromagnetic interference. 2) Information transmission is mainly between equipment, so it requires high reliability of communication. 3) The content and time of communication can be set in advance, and the information generated randomly and spontaneously is relatively small, which can greatly simplify the communication protocol. 4) Due to more monitoring information, the real-time requirement is high. 5) Some fault diagnosis and fault tolerance are required to prevent unnecessary system failures. 6) Short distance and high frequency. Based on the above characteristics, the master-slave communication mode with simple protocol, fast response and high reliability is usually adopted in the interconnection network of the underlying equipment, and the low-grade products in the industrial control network, such as fieldbus, are used. 5. The development environment of CNC system is becoming more and more friendly how to install the NC system on a machine tool is the development environment of CNC system. In addition to hardware connection, there are mainly two aspects of the problem, one is the preparation of PLC ladder diagram. The other is the determination of machine parameters. The former mainly solves the matching of auxiliary functions, such as machine cooling, lubrication, spindle forward and reverse rotation, and the adaptation of machine operation panel. The latter mainly matches the main motion of the machine tool, such as feed rate, acceleration and deceleration, travel limit, etc. This paper mainly introduces the development of PLC ladder diagram. The ladder diagram of early CNC machine tools was compiled by CNC engineers according to the functions of machine tools. After compiling, it will be inserted into the numerical control softwareWith the popularization of numerical control technology, the interface software development monopolized by CNC system manufacturers has been transferred to machine tool factories or CNC integrators. Users can develop their own according to the integration methods and documents provided by CNC manufacturers, which greatly promotes the development and popularization of CNC technology. Now, in order to reduce the burden of the machine tool factory and system integrator to write ladder diagram, Siemens company provides PLC application program example and subroutine library description in 802D system. When the end user writes ladder diagram, he can complete the ladder diagram by using parameter call, which greatly facilitates users and saves time. 6. CNC related technology and social service system are gradually improved CNC related technology is the first to launch CAD / CAM. At present, commercial CAD / CAM software is very rich, and ug-ii, Pro / E, Solidworks, Mastercam are very common. The content of process planning (CAPP) is integrated to provide users with typical process plans for selection. The generated NC machining program is more in line with the actual needs. At present, the common problem is that the binary files (cutter location files) generated by CAD / CAM software should be transformed into string files after post-processing, which can be used by CNC machine tools. Once these parts processing programs enter the CNC system, they restore the binary files for interpolation and other operations. This kind of information transmission process is difficult to achieve high efficiency, high quality and fast. People are looking forward to an efficient information transmission mode of CAD / CAM / CNC, and there is still a long way to go. 7. After decades of development, CNC cutting machine has made great progress in cutting energy and CNC control system. The cutting energy has developed from single flame energy cutting to multiple energy (flame, plasma, laser, high pressure water jet) cutting mode; the control system of CNC cutting machine has changed from simple function, complex programming and input mode to automatic cutting mode The development of CNC technology is inseparable from the improvement of the whole social service system, including personnel training, maintenance services, etc. In October 2002, the Ministry of labor and social security of the people's Republic of China launched a high-level skilled personnel training project for mechanical and electrical engineering, including CNC machining and maintenance personnel. In May 2002, China mechanical and electrical equipment maintenance and Transformation Technology Association authorized to carry out CNC maintenance and transformation enterprise qualification certification, and 24 enterprises have passed the certification. With the increasing status of manufacturing industry in China and the increasing market demand, CNC industry will develop rapidly and make greater contribution to the rejuvenation of the Chinese nation.