Influence of Tool Coating on Drilling and Routing Performance of Aluminum-Based Materials
The influence of tool coatings on the processing performance of 6063 aluminum alloy and aluminum substrate,as well as typical aluminum-based materials,was studied.The friction coefficient of aluminum alloy with different coatings was studied by using a friction and wear testing machine,and the morphology and composition of the wear scars on the surface of the grinding pairs were analyzed.Different kinds of coated drill bits and routers were designed to machine 6063 aluminum alloy plate and 5052 aluminum substrate.Through the testing of drilling and routing performance and the evaluation of machining quality,the processing difficulties and tool failure mechanism of aluminum alloy during drilling and routing were analyzed,and the solutions to high quality and long life for processing typical aluminum-based materials used in consumer electronics and electronic circuits were obtained.The results show that the minimum friction coefficient of hydrogen-free diamond-like coating is about 0.06;the friction coefficient of carbon-based composite coating is about 0.15,and the friction coefficients of cemented carbide,TiSi-based coating,and TiAl-based coating are all greater than 0.6.Hydrogen-free diamond-like coating can effectively inhibit the adhesion of aluminum chips on the drill bits and router,improve the chip removal ability of the tool,and keep the cutting edge sharp during machining.During the drilling process,the problems of the broken micro drill bits,a large amount of burrs on the surface of the hole,and short tool life are solved.Compared with uncoated cemented carbide micro drill bits,the life of the drills is increased by three times.During the routing process,a large amount of burrs on the surface of the slot and poor dimensional stability are solved.After routing an aluminum substrate of 10 m,excellent dimensional accuracy can still be obtained.
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