Experimental study on the development of a micro-drilling cycle using ultrashort laser pulses |
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| Institution: | 1. Department of Industrial Engineering, University of Parma, Italy;2. Department of Industrial and Civil Engineering, University of Pisa, Italy;1. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China;2. Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin 150001, China;3. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;1. Department of Civil and Industrial Engineering, University of Pisa;2. Continental Automotive Italy S.p.A;1. College of Materials & Mineral Resources, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi Province, China;2. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, Shaanxi Province, China;3. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, Shaanxi Province, China |
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| Abstract: | Microholes for the production of high precision devices were obtained by ultrashort pulsed laser machining of martensitic stainless steels. A micro-drilling cycle based on the sequence of a drilling through phase, an enlargement and finishing phase is proposed in order to solve the trade-off between process time and quality of the ablated surfaces without making use of complex design of experiments. The three phases were studied taking into account the evolution of the microhole shape as a function of the main process parameters (number of passes per phase, incidence angle and radius of the beam trajectory respect to the hole׳s axis).Experiments testified that the drilling strategy was able to produce cylindrical holes with diameter of 180±2 μm on a 350 μm thick plate in total absence of burrs and debris within a drilling time of 3.75 s. Repeatability tests showed a process capability of nearly 99%. SEM inspection of the inner surface of the microholes showed the presence of elongated and periodic ripples whose size and inclination can be controlled adjusting the incidence angle of the beam over the tapered surface before the ultimate finishing phase. |
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| Keywords: | Laser Ablation Microdrilling Stainless steel |
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