Research On Data Transmission In CNC Networking

With the development of technology and science, Machine manufacturing gives a higher request to the quality of product. Numerical control tools are developing quickly and used widely because they are more roboticized, less error of machined parts, products' quality are steady, easy to product exploder and easy to realize computer aid manufacture. But of you give a vertical look to the use of numerical control tools making less use of, and their efficiency are not bring into full play. These phenomena are caused by many factors. Firstly, most of CNC don't have network function and big capability of store facility in the early. Secondly, Numerical control program/control parameter/tools compensation must be inputted by hand on-line. With the development of CAD/CAM system, this software goes into practical machining. It is an effectual way to improve numerical controls'efficiency by use auto-program system or CAD/CAM soft to make numerical control programs,control parameter and tools compensation off-line,after NC programs are validated by imitated, they are transferred from local server computer to CNC by a data transfer protocol.This paper gives a detail research to FANUC milling center of mumerical control and mould develop graduate school. It uses RS-232C series interface as a communication interface.We use VC++6.0 as an empolder tool, give some research as follows:(1) The communication of local server computer and FANUC CNC is research: RS-232C series interface is used as communication breakthrough RS-232C's pins definition, the connection mode between CNC and PC fomat of numerical control program, communication parameter definition, communication mode, stream transfer protocol definition are lucubrated and communication between CNC and local server PC is made true.(2) The research of building comouter net, realizing the net communication between local server PC and CAD/CAM design computer is done.Include: Web analysissite, juncture mode and communication protocol are chose.NC programs and control parameter made by long-distance CAD/CAM software are transferred to local server computer, then are transferred to CNC's memory in the form of text file. NC prlgram and control parameter are loaded thtough long-distance and are transrerred by internet/intranet.(3) Microsoft Visual C++6.0 based on Windows is used as exploder tool and numerical control program imitation software is developed.