Basic development of data sharing CNC system (Case study on high accuracy machining of characteristic lines)

In this study, machining problems that can be solved by a numerical controller are considered, and a solution method is proposed. Regarding the data flow of machining process chains, product shape data created by computer-aided design (CAD) are converted into point sequence data by computer-aided manufacturing (CAM) to create a machining program in the machining process chain. Computer numerical control (CNC) faithfully interpolates a dedicated CNC program (ISO code) indicating a tool path and processing conditions, called G code, for machining a workpiece. However, there are no design shape data in the machining process. As the result, accurate measurement and correction with additional processing are required to obtain a high-precision product shape. In this study, as a mechanism that enables information flow belonging to CAD and CAM to be shared without losing it until CNC program execution, the implementation of an integrated CNC system with a shared database is addressed. Information in this database is described according to a predetermined format as data models. The data model that is the basis of information sharing and its practical use are described. Forming characteristic lines on a die were applied for confirmation of the effectiveness of the mechanism using data model. It was confirmed that actual machining realized high machining accuracy compared to the conventional technology.

Abstract licence: CC BY-NC-ND

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