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CSME 2018/02
Volume 39 No.1
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65-73
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Performance and Wear Characteristic s of Cutting Tool in Laser Ultrasonically Assisted Cutting of Cemented Carbides
Chang-Juan Zhanga, Feng Jiaoa and Ying Niua
aSchool of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo Henan , China
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Abstract:
Laser ultrasonically assisted cutting (LUAC) for processing difficult to machine materials was proposed based on ultrasonically elliptical vibration cutting (UEVC) and laser assisted cutting (LAC) LAC), and experimentally compared with conventional cutting (CC), UEVC and LAC . The cutting performance of cemented carbides with different hardness using polycrystalline cubic boron nitride (PCBN) cutting tools was analyzed and wear mechanisms of the cutting tools was discussed by detecting tool wear conditions, cutting forces and surface morphology of workpiece and analyzing the energy spectrum of worn areas by scanning electron microscopy (SEM). The results showed that compared to CC, UEVC and L AC, LUAC showed significantly decreased cutting force, reduced tool wear, obviously prolonged tool life, and smoother surface quality of workpiece, especially for the cemented carbide with more cobalt element s In addition, LUAC of cemented carbide was characterized by smooth and uniform crater on the rake face of the cemented carbide and narrow triangular wear land and shallow pits and scratches at the flank face of the cemented carbide. The failure mechanisms of PCBN cutting tool were the synergistic interaction among diffusive wear, adhesive wear, oxidation wear and abrasive wear.
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Keywords: cemented carbide, laser ultrasonically assisted cutting , ultrasonic ally elliptical vibration cutting , laser assisted cutting , tool wear
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©
2018
CSME , ISSN 0257-9731
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