What Is The Key To The Development Of Domestic Nc - Hc Network Machine Tool Industry

1 development direction of China-made CNC

Identify the conditions for our CNC development, the establishment of a viable road to development is through technological innovation and development of key domestic NC.

1.1 CNC system and development of the main forms of the future

Seen from the numerical control system can be divided into dedicated computer numerical control systems and general computer numerical control system into two categories. Generally optimistic about the current foreign and domestic manufacturers of CNC system development is a universal computer numerical control system. CNC machine in general comes as the most successful PC NC system.

As PC (including industrial PC) yield, low cost, technological progress and the performance improved quickly, and can be * high (industrial PC host MIBF than 30 years [1]). Therefore, its hardware and software platform as the CNC system can not only significantly improve the numerical control system cost performance, but also have full use of computer to computer software and hardware resources and share the latest achievements in the field, such as mass storage, high resolution rate of color display, multimedia information exchange, networking and communications.

Currently, PC NC system architecture mainly in the following forms:

(1) NC plus dedicated front-end PC's composite structure design of such systems is the NC General PC and dedicated high-speed information exchange through the channel connected to form a complex with the NC system. The advantages of such systems can maintain their numerical basis, play manufacturers dedicated hardware chip in to the special control functions, and other areas, and technically easy to secrecy, so much for some old NC vendors or manufacturers are stronger used. The biggest drawback of such systems is limited openness, development and production costs higher, slower technology upgrading. Can be expected under current conditions in China, such systems do not have a big development.

(2) General PC plus real-time control unit hierarchical structure whose design is to use PC-NC system software and hardware as a platform, in its standard bus directly connected to real-time control unit (the real-time control board into the bus slot) which consists of a complete CNC system. One, PC machine is the top number of NC system is not very strong real-time tasks and system-wide coordination and management of the operation, and real-time control unit is the lower of NC high real-time control tasks. Real-time control unit can be calculated with a trajectory interpolation, position control, switching control (PLC) such as a complete CNC unit, it can be only a simple position control bits control card or digital servo interface, digital pulse conversion card. Since such system is simple and easy to implement open, relatively low cost, so get many domestic and foreign companies, especially small and medium manufacturers widely used. But there are some disadvantages of such systems. The most prominent is the real-time control unit and servo drive unit of information exchange between. Currently, real-time control information sent to the servo drive unit, there are two main methods: one is through the analog form, the main problem is difficult to eliminate zero-drift, temperature drift on the accuracy, vulnerable to external interference. The other is through the form of pulse volume, the main drawback is that real-time control unit and servo drive unit between the need to pass through the direct instruction of non-coding pulse signal, once the loss of pulse or the introduction of the interference pulse, difficult troubleshooting error correction, not easy to guarantee information can be * of the high.

(3) digital distributed architecture of its program will be composed of DSP digital servo such as the medium through the network cable and connect the PC Control Unit to form a complete CNC system. Since this system uses distributed computing and control, and through high can * and high real time network communication and coordination, so you can maximize the capacity of the various subsystems so that the whole CNC system with good performance . However, this system development and production costs high, there is no greater investment is difficult to be launched.

In summary, this paper that these three structures are not the best program in line with China's national conditions.

1.2 PC is consistent with China's development road of NC

Decades of experience and lessons show that the reliability of good and bad is the key to the survival of domestic CNC system. We are in the development of new numerical control systems, giving priority to new high-performance CPU (such as high frequency of the Pentium , Pentium , etc.) as the core of the system operation and control and minimize the use of software to all the features of NC. This can significantly reduce the size of the system hardware. Should also be in software design, power design, design and selection of connectors, grounding and shielding design and construction of such high use of strong immunity can * design and manufacturing technology, thus improving overall system reliability.

CPU-based high-performance PC platform can not only complete digital control system of basic functions (such as information processing, tool compensation calculations, interpolation calculation, acceleration and deceleration control, etc.) and switching control function (built-in PLC) , but also complete servo control functions. Thus, before the DSP, the digital servo control functions (such as position control, speed control, vector control, etc.) is available to the PC's CPU to complete in order to achieve built-in servo control, which not only effectively reduces the numerical part of the hardware scale but also significantly reduce the size of the servo control part of the hardware.

That have built-in PLC and servo control of all built-in software of integrated control system, the hardware will reach its minimum, the CNC system platform than a PC, the only remaining machine and the power drive interface and feedback interfaces. This not only effectively improve the system * of, but also improves system performance, but can also significantly reduce the system cost, the system (including motors) can be reduced to the current price of about half of CNC system. Obviously, this high-performance, high reliability, low cost of new NC system is highly competitive, is expected to create a new situation in China to contribute to NC.

In addition, the integrated PC NC system there is a big advantage, that is easy to implement an open architecture. This is because such a system's hardware is already fully open, constitute the work of open CNC system entirely in software, as long as the development of good standards and protocols, from the information processing, trajectory interpolation, acceleration and deceleration control, switching control to the servo control can be open, which can greatly facilitate the user.

by: gaga

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