Abstract
Standard STEP-NC (ISO 14649) presents a new model for data transmission between CAD/CAM systems and CNC machines. This standard eliminates the shortcomings of the standard G-code and provides new possibilities in their management. At the Department of Automation and Production Systems, Faculty of Mechanical Engineering, University of Zilina in the framework of the research activities was solved a project for the implementation options of STEP-NC format by programming of CNC machines. This paper presents the results of research solutions which focused mainly on the analysis of standard STEP-NC, a methodology on the model data according to the standard STEP-NC using the EXPRESS language as well as the creation of software for the transformation of STEP-NC data - "TERMINAL STEP NC". The software has been verified in the transmission of STEP-NC data to a particular CNC machine control system. Transfer of STEP-NC data applications gives the possibility of verifying the implementation of the new standard in older types of CNC machines.
Highlights
Automation is a key element of the production process and puts higher demands on the level of mechanization and control of production machines
Producers of CNC machines extend this standard using various additions and implementations thereby becoming this standard non-universal. Another disadvantage is the lack of portability of data, which prevents the full utilization of all new possibilities of CNC machines and CAD/CAM systems [1]
At present, a new standard for transmitting data between CAD/CAM and CNC machine was developed, which eliminates the shortcomings of G-code and provides a new option in the control of CNC machines known as STEP-NC standard
Summary
Automation is a key element of the production process and puts higher demands on the level of mechanization and control of production machines. At present, a new standard for transmitting data between CAD/CAM and CNC machine was developed, which eliminates the shortcomings of G-code and provides a new option in the control of CNC machines known as STEP-NC standard. It is the application of STEP methods (Standard for Exchange of Product model) for numerically controlled machines. STEP-NC is being developed concurrently under two different subcommittees of ISO Technical Committee 184 (Industrial automation systems and integration), as two different standards - ISO 14649 (Data model for computerized numerical controllers) and ISO 10303-238 (Application interpreted model for computer numeric controllers). Both of them can be represented in 10303-21 [4]
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