The use of networking functions in numerical control devices

1 The purpose of CNC machine tool networking (1) to improve program input efficiency.

(2) Facilitate program management.

(3) Improve the efficiency of the use of CNC machine tools.

2 The common way of CNC machine tool networking Because the number of CNC machine tools varies from company to company, the networking solutions are not the same. Some use a certain connection form, or a combination of several forms. But the principle is basically the same. At present, several common networking methods are as follows: 2.1 Single serial port device server type This design scheme is characterized in that each serial port numerical control device is equipped with a single serial port device server respectively, so that any device can be directly connected with the Ethernet to achieve Any computer on the Ethernet can directly control any CNC device. This connection method requires the enterprise to have a standard local area network. It is not limited by the length of RS232 transmission. It is not only flexible, but also allows any computer to directly control any CNC equipment, making the control of CNC equipment much more flexible. Improved, and reliable, because this connection is a typical star connection, even if a single serial device server fails, it will only affect one device.

2.2 Multi-serial device server type This solution features a multi-serial device server to connect multiple CNC devices to Ethernet (Ethernet, IEEE 802.3 standard). In this way, any computer on the Ethernet, You can directly control any machine on the network. This type of connection not only has a lower average cost, but also has good flexibility, because any computer can control any CNC equipment, so it has high flexibility. However, due to the limitation of RS232 transmission distance, when it exceeds 15 meters, the long-distance receiver must be added. When a multi-serial device server fails, it affects multiple devices.

3 CNC machine tool networking software application.

The networking of CNC machine tools requires the corresponding software as support. There are many softwares available for selection, such as CNCLINK4.1 developed by Beijing Leister Control Technology Co., Ltd., NCNET2.0 of Shanghai Tianao Technology Co., Ltd., and ExtremeDNC of ASCENDANTTECHNOLOGIES of the United States. These softwares are powerful and generally compatible with all current CNC systems and are compatible with all current communication methods. Take NCNET2.0 as an example. This is a commonly used domestic software, full Chinese interface, suitable for Chinese users. The software adopts the client/server management mode, which can be used by the operator in the CNC machine control panel for program directory query, program upload, downlink, etc. The numerical control equipment supporting the DNC working mode can be processed by the network DNC; each machine corresponds to one The sending box (OutBox) and a receiving box (InBox), the sending box stores the NC program designed by the craftsman, and the receiving box stores the NC program uploaded from the machine tool to ensure that the program is not accidentally covered.

4 data transmission and reception.

The current CNC system functions are very complete, generally support RS-232C communication function, that is, through the RS-232C port transmission and reception processing program, the received processing program is stored in the system memory (Memory).

Although current CNC machines generally have an RS-232C interface, RS232 is a standard serial communication interface for personal computers (PCs). According to the RS232 standard, the drive allows a capacitive load of 2500pf, so the communication distance is limited by this regulation. In addition, RS232 is a single-ended signal transmission, which has common ground noise and cannot suppress common mode interference problems, resulting in unreliable communication. In an environment where there is a strong source of interference, the problem of unreliability is particularly acute. Therefore, the communication distance of RS-232C is not allowed to be too far. Sometimes, in order to improve the communication distance, a 232C/422A converter can be added in front of RS-232C to change the RS-232C level transmission into differential drive reception. Although most CNC systems have an RS422 interface, they are all on the CNC internal control box or control board and are not connected to the external chassis of the machine. This RS422 interface can be found to be used directly. PCs generally do not have an RS422 interface. They can be expanded by purchasing a board with an RS422 interface, or they can be used as an adapter board to implement RS232 to RS422 conversion. Because RS422 adopts balanced transmission and differential acceptance, it uses two pairs of shielded twisted pair connections, so it has the ability to suppress common mode interference, making RS422 communication distance up to several tens of meters to several kilometers. Its receiver has High sensitivity, able to detect voltages as low as 200mV, so the transmitted signal can be far away and not true.

5 The development direction of CNC machine tool networking technology.

With the increasing use of computer technology and network technology, the networked and integrated CNC machine tools have become an inevitable trend and direction. It is only a matter of time before the Internet enters the workshop of the manufacturing plant. From another point of view, the current popular ERP, that is, factory informationization, is limited to the general management department (human, financial, material, production, supply, sales) or design, development, etc. Informatization is not enough. Therefore, the future of CNC machine tool networking technology will move toward an open Internet. Open networked CNC has a broader development space, which has the following advantages: (1) network manufacturing, global manufacturing (2) remote monitoring and diagnosis (3) remote operation and remote training, as described above, with CNC machine tools With the maturity of networking technologies, many enterprises have taken the networking of CNC machine tools as a necessary means to improve the utilization rate and productivity of CNC machine tools in order to meet the further development of automation technology and the increasing scale of factory automation. CNC machine tool networking can not only improve the production efficiency of the enterprise, but also help the CNC system manufacturer to monitor and repair its products. It also makes computer integrated manufacturing, network manufacturing, remote diagnosis, virtual manufacturing, and concurrent engineering possible. Therefore, the networking of CNC machine tools will inevitably become a major trend in the development of manufacturing in the 21st century.

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