Traceability of In-process Measurement of Workpiece Geometry

• Main Authors: Acko, Bojan, Klobucar, Rok, Acko, Matic
• Format: Conference Proceeding
• Language: English
• Subjects: calibration; machine-tool capability; measurement standard; production process; Traceability
• ISSN: 1877-7058; 1877-7058
• DOI: 10.1016/j.proeng.2015.01.381

In-process metrology is applied in industrial processes with the aim of obtaining and analysing quality data directly in the manufacturing process. An effective approach for improving the manufacturing processes is the incorporation of traceable dimensional metrology directly on machine tools. European project EMRP IND62 TIM that was agreed between EC and European metrology association Euramet is aimed to introduce a traceability chain into in-process geometrical measurements. One of the tasks of the project is to develop highly accurate robust temperature invariant measurement standards that can be used in the harsh environment of the production floor for verification and mapping of the measurement errors of machine tools. Laboratory for Production measurement (LTM) at the University of Maribor - Faculty of Mechanical Engineering is taking part in the consortium of this joint research project. The main task of LTM is to develop, manufacture and calibrate at least 1D measurement standard with length up to 2 m and with thermal expansion coefficient close to 0. The task will be performed in co-operation with EMO Orodjarna, Gorenje Orodjarana and Veplas. The design is based on composite body and ceramic probing balls. Original approach of compensating thermal expansion was introduced in order to enable use of the standard in harsh environmental conditions. The article presents basic principles of in-process measurement traceability as well as the physical standard under development and application possibilities of this standard.