I. Introduction In recent years, with the development of computer technology, communication technology and numerical control technology and the need of manufacturing automation, DNC technology has been more and more widely used. At present, the enterprise information concept represented by CIMS has been paid more and more attention. DNC has gradually evolved from a single program transmission to an extended DNC that integrates functions such as data management and production information monitoring, and has become a key part of CIMS integration. . Second, the concept and characteristics of DNC: The term DNC was originally referred to as Distributed Numerical Control, which means that several CNC machines are controlled simultaneously by a large computer. Later, with the advancement of science and technology, the numerical control system was developed from NC (Numerical Control) to CNC (Computer Numerical Control). Each CNC machine was controlled by a computer (CNC system), so the past DNC ​​concept has been Lost the purpose. The current CNC system function is very perfect, generally supports RS-232C communication function, that is, receiving or sending processing program through RS-232 port, there are many CNC systems that can perform cutting processing while receiving N/C program. This is called DNC (Direct Numerical Control), but not all CNC systems support this function. Some systems only store the received machining program in the system memory (Memory), but not both. Generally called block (BLOCK) transmission. With the rapid development of electronic technology, some CAD/CAM software that can only be run on mainframes or workstations can now be applied on very cheap microcomputers, which makes the CAD/CAM system gradually popularized. These CAD/CAM systems generally perform 3-D surface modeling and generate corresponding N/C codes. These 3-D forms of N/C code are very long, generally reaching several hundred K and several megabytes. Most of the CNC system's memory is difficult to accommodate such a large processing code. At this time, it is most economical to use DNC for transmission processing, because for most CNC systems, the expansion system memory is very expensive, and the current PC and its Memory expansion is very cheap. Therefore, using the RS-232 serial communication port to network the NC machine tools in the workshop is an important means of using NC machine tools. Third, the current machine tool communication and NC program management status: 1. Current status and problems of NC program communication methods 1) The existing CNC system in the workshop is complicated, and the communication procedures used between the systems are different. The status quo of mutual incompatibility is inconvenient for technicians and operators, which greatly limits the inconvenience. Transfer processing of parts. 2) The communication program is a one-to-one communication program. It does not have the program automatic response and monitoring function. When communicating between the machine and the computer, two operators must work at the same time. One machine is operated in front of the machine and the other is in the computer. The communication software is operated before the terminal, and the two operate alternately to complete the communication work, so it is very inconvenient. In most of the operations in the actual operation, the method is to put a computer on the side of the CNC machine, or to share the same computer with multiple CNC devices. The transmission software is mostly the software that the machine tool factory has, and the dos version is mostly. The transmission of the program is carried out in an interactive manner, that is, after the machine is set to wait state, the computer transmits again. 3) Remote transmission cannot be realized, and the working environment of the technician is poor. Noise, dust, oil and gas in the workshop, the environment is poor, should minimize the technical staff to run around the machine room and machine tools for the transmission process, peace of mind in the machine room to program, remotely called by the operator at the machine, technology When the program is debugged, the personnel can debug the program together with the operator. After the program is transferred, the remote transmission function is automatically transferred to the corresponding directory or database in the machine side. Next page
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