Experimental characterization of a micro-hole drilling process with short micro-second pulses by a CW single-mode fiber laser

The demand for micro drilling with a diameter in a range of a few microns to several hundred microns is increasing in industries such as electronics, aerospace, medicine and automobiles, due to a significant uptake in the use of miniaturised products and devices. In order to satisfy the demand, a number of different micro drilling techniques have been developed. There has been, however, no report which explains, compares and contrasts all of these micro drilling techniques. This study examines the lasts micro drilling methods and techniques, categorises them into different groups, highlights recent developments and new trends, and depicts the future requirements in the field of micro drilling. Both conventional and non-conventional micro drilling techniques used in modern age applications are categorized. Conventional micro drilling makes use of drill bits of different configurations such as twist, spade, D-shaped, single flute, compound drill and coated micro drill, while non-conventional micro drilling involves electrical, chemical, mechanical and thermal means which include laser, EDM, ECM, SACE, electron beam, ultrasonic vibration or combinations of these approaches. We present here, a comparative study of conventional and non-conventional micro drilling techniques in order to show the potential and versatility of various micro drilling methods.

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“…Typical pulse durations for laser ablation are in the nano, pico and femto second ranges [203][204][205].…”

Section: Laser Micro Drillingmentioning

confidence: 99%

“…femtosecond laser micro drilling are gaining much attention in these days, due to the advantage of minimal spatter, micro cracks and recast layer formation. The expensive source of solid state lasers can be replace by comparatively less expensive fiber laser [48,204,206].…”

Section: Comparison Of Different Non-conventional Micro Drilling Techmentioning

confidence: 99%

A review of modern advancements in micro drilling techniques

Hasan

Zhao

Jiang

2017

Journal of Manufacturing Processes

161

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“…Furthermore, the laser beam can heat the material to the evaporation point and the resulting material vapor escapes out of the hole. At this time, steam is formed and released; the waste comes out of the cavity and the molten walls around the cavity are formed (Parandoush et al, 2014, Jay Tu et al, 2014, Dubey et al, 2008 Ghoreishi and Nakhjavani (Ghoreishi et al, 2008) studied an ANN-based process model to find the relation between process parameters (pulse frequency, power, pulse width, number of pulses, assist gas pressure, and focal plane position (FPP)) and output parameters (hole entrance and exit diameters, circularity of hole entrance and hole exit, hole taper) of laser beam percussion drilling (LBPD) using the experimental results. Pulsed Nd:YAG laser source was used to drill the 304 steel sheets with the thickness of 2.5 mm.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of Process Parameters on Laser Percussion Drilling Using Finite Element Methodology; Statistical Modelling and Optimization

Moradi

Golchin

2017

Lat. Am. j. solids struct.

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In the present research, the simulation of the Nickel-base superalloy Inconel 718 fiber-laser drilling process with the thickness of 1mm is investigated through the Finite Element Method. In order to specify the appropriate Gaussian distribution of laser beam, the results of an experimental research on glass laser drilling were simulated using three types of Gaussian distribution. The DFLUX subroutine was used to implement the laser heat sources of the models using the Fortran language. After the appropriate Gaussian distribution was chosen, the model was validated with the experimental results of the Nickel-base superalloy Inconel 718 laser drilling process. The negligible error percentage among the experimental and simulation results demonstrates the high accuracy of this model. The experiments were performed based on the Response Surface Methodology (RSM) as a statistical design of experiment (DOE) approach to investigate the influence of process parameters on the responses, obtaining the mathematical regressions and predicting the new results. Four parameters i.e. laser pulse frequency (150 to 550 Hz), laser power (200 to 500 watts), laser focal plane position (-0.5 to +0.5 mm) and the duty cycle (30 to 70%) were considered to be the input variables in 5 levels and four external parameters i.e. the hole's entrance and exit diameters, hole taper angle and the weight of mass removed from the hole, were observed to be the process output responses of this central composite design. By performing the statistical analysis, the input and output parameters were found to have a direct relation with each other. By an increase in each of the input variables, the entrance and exit hole diameters, the hole taper angel, and the weight of mass removed from the hole increase. Finally, the results of the conducted simulations and statistical analyses having been used, the laser drilling process was optimized by means of the desire ability approach. Good agreement between the simulated and the optimization results revealed that the model would be appropriate for laser drilling process numerical simulation.

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“…This is the reason why the laser beam drilling is an interesting process for composite materials. The process itself has been analyzed in many references for bulk material by experiments [17,18] and numerical simulation [19,20].…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Drilling of Cellular Metals: Numerical Simulation

Araújo

Merkel

Öchsner

2016

Computational Modeling, Optimization and Manufacturing Simulation of Advanced Engineering Materials

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Laser drilling is a highly efficient technique to generate holes in almost any material. It offers an alternative manufacturing method to mechanical drilling and water stream cutting. The relatively small amount of heat involved in the process results in a small heat affected zone. This characteristic makes laser processing interesting for several engineering application. Within this chapter the drilling process is applied to cellular materials. A program code was developed and implemented in order to predict the relation between the initial parameters and the final characteristics of the drilling process, such as depth-time behavior for each amount of initial energy. The simulation of the laser drilling process uses the concept of homogenized cellular materials. It is studied the influence of the heat intensity of the laser in the process. Also the influence of material parameters like thermal conductivity, specific heat and enthalpy are studied. The results of the simulations of the drilling process closely match to the experimental results. The thermal conductivity is of paramount importance for the final results of the laser drilling procedures. The program code can be used for example to the optimization of the laser drilling procedures and to determine or confirm the material properties of the materials as well.

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Experimental characterization of a micro-hole drilling process with short micro-second pulses by a CW single-mode fiber laser

Cited by 37 publications

References 12 publications

A review of modern advancements in micro drilling techniques

A review of modern advancements in micro drilling techniques

Investigation on the Effects of Process Parameters on Laser Percussion Drilling Using Finite Element Methodology; Statistical Modelling and Optimization

Laser Beam Drilling of Cellular Metals: Numerical Simulation

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