Research On Key Technology For Turning Process Based On STEP-NC

In the trend of the higher productivity, higher quality of the product and lower production cost, NC is commonly used in manufacturing as an advanced manufacturing Technology, and turning is one of the most important manufacturing methods, In the current, NC systems are controlled by the G code (ISO6983), massages are transferred only in one direction, from the PC to the control card, NC system control the CNC machine tools'movement only by G code programs, problems in processing can not be directly feedback to the design stage, so ISO6983 is difficult to support the advanced manufacturing methods and the intelligent CNC systems.In 1997, west industrialized countries, the EU and the United States for examples, proposed a new CNC interface standard called STEP-NC, in order to improve the data exchange ability in CAD/CAPP/CAM/CNC modules and overcome the shortcomings of ISO6983. STEP-NC is the expansion of the STEP standard to the NC field, the purpose is to build a information superhighway between the design and manufacturing process. ISO 14649-12, as the part 12 of the STEP-NC, describes the data model and technical for STEP-NC turning in details. With the integration and intelligence of manufacturing systems, STEP-NC turning technology will have a broad prospective development.This study is one part of the development of the intelligent STEP-NC turning, introduces the data model and information extraction methods briefly, focuses on the optimization of process parameters, studies the process planning and path planning, and carries out the data transformation between the PC and NC control card with study above, as a part of STEP-NC turning development work.For the STEP-NC program, the first is to learn the components and the content which the program describes, and the STEP-NC turning system identifies the program and extracts the information from it. According to the content of the STEP-NC program, this study realizes to read STEP-NC program through the read module and extract the information from the program through the information extraction module, then the entities in the STEP-NC program are mapped to classes and processed, this study proves the feasibility of the read module and information extraction module through information trees and other modules at last.In addition, this research studies the information extracted from the program, especially the processing parameters, establishes the optimization model and develops the corresponding module for the processing parameters. The optimization theory and the optimization module are feasibility through the comparing with the example instanced in the actual process. Besides this paper analyzes the Technology and studies the path planning for the typical characteristics of STEP-NC turning. Also, this research studies the division and adjustment, and develops the corresponding module for the whole workpiece. This paper displays the whole workpiece and the path planning through three-dimensional display module. Finally, this study proves the feasibility of the theory and the corresponding modules through an example instanced in the STEP-NC standard.