Study on Machining Quality of Cast Graphite Iron with Surface Micro-textured Drilling Tools
Tool adhesion significantly affects the quality and efficiency of components during the machining of cast graphite iron.The tool with micro-texture aids in improving the chip-tool interface,thereby enhancing cutting performance.To explore the impact of micro-textured drilling tools on the cutting performance of cast graphite iron,nano-second laser mi-cro-machining technology is utilized to generate micro-pit textures on the blade portion of hard alloy drill bits.This study in-vestigates the influence of various surface micro-texture parameters and process parameters on the quality of drilled hole walls.It establishes a model for hole wall quality and analyzed the effects of micro-pit-textured drill bits on the microscopic morphology of drilled holes and chip formation.Experimental findings reveal that the roughness(Ra value)of the hole walls generally increases with the feed rate,with micro-pit-textured drill bits exhibiting superior Ra values compared to non-tex-tured drill bits.The sequence of influence on hole wall roughness(Ra)is micro-pit texture distance from the cutting edge>feed rate>micro-pit texture spacing.Moreover,surface micro-pit-textured drill bits significantly impact the shape of chips,resulting in increased curling,effectively enhancing chip breaking and subsequently improving drilling stability and the quality of hole wall machining.
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