Integrated Interface System of STEP Data Models for the Tool Path Generation

Abstract

The STEP (STandard for the Exchange of Product model data) is a worldwide standard for exchanging products between diverse computer systems and industrial applications. STEP files (ISO 10303) contain 3D data in the universal data format with a boundary representation (B-rep) that allows the exchange of data models between CAD, CAM, and CNC systems. Traditionally, G-code generation relies on CAM software as an add-on, which incurs significant installation costs. The purpose of this paper is to describe the development of an Integrated Interface System (I2S) for Tool Path Generation (TPG) for the CNC milling operations utilizing neutral STEP files.The algorithm was interpreted in Hypertext Preprocessor (PHP) programming and produced a computer interface system that is capable to convert STEP file geometric data to G-code format.The geometric features of the sample block were modeled using a 3D CAD model. The result was validated using machining simulation, and the machining is performed on a three-axis CNC milling machine with a PC-based controller.In modern manufacturing systems based on Open Architecture Controller (OAC), the development of the I2S provides an alternative to generating machining tool paths and G-code by intercepting CAM software.

G-code converter using interface system for a STEP file (ISO 10303)

“…One successful approach involved manipulating, understanding, and extracting STEP files, accomplished through developing a STEP file parser. This parser identified specific geometric features by employing generic methodologies and techniques, such as geometric data processing, geometric data extraction (GDE) method implementation, workflow construction, hierarchical tree creation, and algorithm development [25]. Before designing the interface, it is necessary to study and comprehend the machining feature present in a 3D CAD model and the structure of STEP data.…”