METALS AND METAL MATRIX COMPOSITES |
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Effects of Wet Micro-blasting on Surface Integrity and Cutting Performance of Coating Tools for TC4 Cutting |
CHANG Kaishuo, ZHENG Guangming, LI Yang, CHENG Xiang, LIU Huanbao, ZHAO Guangxi
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School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China |
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Abstract The problem of short service life of coated tools is prominent in high-speed cutting of TC4 (Ti6-Al4-V). The surface integrity of coated tools can be improved by surface post-treatment which is an effective way to improve the service life of coated tool. Experiment in high-speed dry cutting of titanium alloy is conducted with TiAlN coated tool which is post treatment by wet micro-blasting to reveal the influence of micro-blasting on surface micro morphology, roughness, micro hardness and residual stress. High-speed dry cutting tests are carried out to study the influence of micro-blasting on coated tool life and wear mechanism. The result indicates that the appropriate blasting process (water and particles mixed, wet micro-blasting, blasting pressure is 0.1—0.5 MPa, blasting time is 0—10 s, particle is Al2O3or ZrO2) can remove large particles, bumps and other micro defects of the coating surface to improve the surface morphology. However, too high blasting parameters has a significantly reduce tool life in machining, especially in high-speed cutting. The blasting particles and time mainly affect the removal of coating materials, and change the surface morphology, roughness and residual stress. The blasting pressure mainly affects the impact of particles, and improve the surface hardness and residual compressive stress. Compared with untreated tool, the surface integrity of treated tool improves obviously, the duration of stable wear stage is prolonged and the tool life can be increased by 50%.
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Published: 07 September 2021
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Fund:National Key Research and Development Program (2018YFB2001400) and China Postdoctoral Science Foundation (2019M652439) and National Natural Science Foundation of China (51505264) and the Zibo City-Shandong University of Technology Cooperative Projects (2018ZBXC003). |
About author:: Kaishuo Changis a master student at Shandong University of Technology.He graduated from Shandong University of Technology with a bachelor degree in 2017. In 2018, he studied for a Shandong University of Technology.He is committed to researching surface modification of advanced materials and advanced manufacturing technology. Guangming Zhengobtained his M.E. degree and Ph.D. degree in Engineering from Shandong University in Sep. 2007—Jun. 2012. Since 2012, he has been teaching in School of Mechanical Engineering, Shandong University of Technology, associate professor and master supervisor. He performed collaborative research in 2017—2018 in Department of Mechanical Enginee-ring of the University of Alabama. His research interests focus on the high-speed/high-efficiency cutting techno-logy & ceramic tool material design and manufacturing & coating tool surface integrity research. |
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