Response surface method based optimization of ytterbium fiber laser parameter during machining of Al/Al _2O _3-MMC

摘要

This paper presents the investigated results on machining of Al/Al _2O _3-MMC by ytterbium fiber laser. The effects of the different parameters on the response characteristics are explained. A comprehensive mathematical models for correlating the interactive and higher-order influences of various machining parameters such as laser power, modulation frequency, gas pressure, wait time, pulse width on the machining performance criteria e.g., metal removal rate and tapering phenomena has been developed for achieving controlled over fiber laser machining process. The response surface methodology(RSM)is employed to achieve optimum responses i.e., minimum tapering and maximum material removal rate. The parameters wait time and modulation frequency are identified as the most significant and significant parameters for MRR. Modulation frequency range from 600 to 680 Hz taper is minimum. The optimal parametric combination for maximized MRR and minimized taper is identified as 473.12 W laser power, 604.54 Hz modulation frequency, 0.18 s wait time, 19.82 bar assist gas pressure and 93.47% of duty cycle pulse width and finally confirmation tests are conducted to validate the developed models.