Eggprepareringens påverkan i industriell produktion : Eggradie och verktygslivslängd hos omskärpta borrar på Scania

Sammanfattning

This study investigated how edge preparation through drag finishing affected the tool life of re-sharpened drills used in industrial production at Scania Engine Manufacturing. Within Scania DM's current re-sharpening and edge preparation process, a need was identified for quality control after the drag finishing operation. The purpose of the report was to analyse the relationship between edge radius and tool wear, and to evaluate the organizational and technical requirements for implementing microscope as measurement equipment. The work was a combination of literature review, interviews, and experimental drill tests. Tests were performed on drills with varying processing times in a drag finish machine, and the edge radius were measured with a microscope. Flank wear and spindle torque was used as an indicator of tool life. The drilling tests showed that larger edge radius tended to result in greater flank wear and higher torque, indicating increased tool wear. The unprepared drill initially exhibited the lowest torque, but it increased toward the end of the test, suggesting a shorter tool life than the drills with moderate edge radius. The drills with moderate edge radius showed more stable torque curves, indicating a longer tool life. However, the results are limited by a small number of data points and measurement uncertainties. The interviews showed that a microscope can be integrated into the existing production environment, but the implementation requires clear instructions, training, and customized fixtures. The ability to systematically measure edge radii and wear was considered to contribute to better tool control, improved sustainability, and reduced resource consumption.