Research on NC Machining Technology in Network Manufacturing Environment

In the 21st century, CNC machining, as a typical technology for advanced manufacturing, should reflect the scientificization and service of information technology in accordance with the globalization of the market, the fierce competition, the individualization of demand, and the humanization of production. At present, due to the problems of the starting rate and low utilization rate of CNC machine tools in China, the use of numerical control resources is extremely wasteful, which hinders the enhancement of the competitiveness of enterprises and weakens the advantages of advanced manufacturing. The use of CNC machine tools is not a simple device use problem, but a system application project with a certain scale. Not only must the reliability and stability of the technology be improved on the hardware and software of the CNC system, but also the production mode. The development of network technology provides an opportunity for the transformation of numerical control technology. Under the global manufacturing environment, enterprises with different numerical control resources can be connected, exchange information, share resources, and cooperate with each other to jointly improve production capacity.

1 Networked CNC machining technology consists of using network communication technology to establish a networked system for CNC machining, realizing functions such as online design, online manufacturing, online monitoring online training, online marketing and online management, so that advanced manufacturing equipment can better play its role. The role is not only to improve the processing quality and production efficiency of the product, but also to respond quickly to the transient market. To this end, we analyze the entire process of CNC machining, which can be divided into CAD CAPPCAMMRP (material management plan) PDM (product data management) virtual manufacturing (VM) remote control (CAE tool wear monitoring, etc.) and fault diagnosis and other eight functional links .

In order to connect the CNC machine tool to the network into a complete system, we need to form the functional modules in the above steps, which must realize the integration with the network, establish the advanced manufacturing Internet (Internet), and realize the function between each functional module. The related connections and the internal networking of the modules establish an advanced manufacturing intranet (Intranet). Key technologies include: the establishment of 3D visual environment for collaborative design in different places; network publishing and browsing of product graphics and simulation results; network transmission of CNC code; network optimization and transmission of process parameters; remote process monitoring model; Modification; product model data management system for off-site design and manufacturing; security prevention mechanism. In addition, another advantage of networked manufacturing over traditional manufacturing is the ability to communicate online and communicate online.

2 networked CNC machining basic frame product geometry modeling - process parameter analysis - tool path generation - NC code transmission - NC code - example processing - online communication networked CNC machining basic work networked product processing needs the lowest level of work, no Consider the physical factors involved in CNC machining, such as material flow, product data management, cutting force and vibration, wear and precision. Only in the networked environment to achieve the basic work of CNC machining, it is possible to conduct network research on other operations. The basic work mainly achieves the following goals: the product geometry is dynamically posted on the Internet, allowing users to browse to the design they need conveniently, quickly and accurately, and can be interactively modified.

The online optimization function of the process parameters is realized, and the optimization model is established with the precision and the processing speed as the optimization targets, and the cutting amount is determined.

According to the result of ab, the NC code and the path of the tool are automatically generated, and the NC code is automatically generated and transmitted in different places for processing of the product.

The application of virtual manufacturing technology combined with the network to achieve CNC machining process simulation can verify the correctness of the NC code in different places.

e through the above work for on-site instance processing.

f. If there is any doubt in the above links, they can negotiate with each other through the online communication module.

The basic framework of networked CNC machining is shown in the figure. It is based on Internet technology. It connects every link of the basic work of CNC machining with the network. With the global distribution characteristics of the Internet, it builds a networked manufacturing environment for CNC machining, which is manufactured for globalization. The foundation of the environment is laid.

3 Example a. Network production of product geometric shape. Pro/E software is used to realize the 3D geometric shape of the milling products, embedded in the VRML browser form, and browse the WRL graphic files exported by Pro/E. In order to successfully implement web browsing of WRL files, you must install VRML browser VRML2C or CosmoHayer. Use the VRML2C browsing tool to implement the product graphical web browsing page, which can be used to translate, rotate, and simulate the product graphics in the webpage by using the buttons around. Zoom and turn and other operations.

Network production of the trajectory. Use Pro/E software to realize the tool path of product processing, then convert it into bitmap format, and use the image insertion method in webpage to realize web publishing and browsing of the tool path.

NC processing network production. Use Pro/E software to implement 3D geometric simulation graphics for products and convert them into bitmap animations supported by the Web. Using the screen capture technology of the media, the product processing process in the CAM system under the Pro/E environment is captured, and the avi video file is formed, embedded in the set webpage, and the network browsing of the NC processing simulation is completed, which can be used for the online verification of the processing track. .

Online communication. Use the upload and download technology to complete online communication. When the user who is the client accesses the above-mentioned Web page, there will be a place that does not conform to his own design scheme, and communication is required in time. Users can instantly capture the CAD/CAM graphic web page, complete their own annotations or suggestions on the above, save the identified files according to their needs, and then transfer them online to complete the fast communication.

4 Conclusion The network of CNC machining technology is the future development trend of advanced manufacturing. By analyzing the composition of networked CNC machining technology, the basic framework of networked CNC machining is proposed, and the possibility of CNC manufacturing networked manufacturing is verified by an example.

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