Comparative statistical analysis of hole taper and circularity in laser percussion drilling

Ghoreishi, M.; Low, D. K. Y.; Li, L

doi:10.1016/s0890-6955(02)00038-x

Cited by 145 publications

(71 citation statements)

References 9 publications

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“…Some limits, such as rapid tool wear and time for tool change, along with maintenance, are connected when conventional methods are used to make the initial hole. Contactless methods, such as drilling via laser-beam with movements along the hole circumference or a direct laser-beam impact to the processed material, appear to be a solution [5,6].…”

Section: Introductionmentioning

confidence: 99%

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

Tomáš

Džupon

Evin

et al. 2018

Metals

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This paper researches the surface condition and wear on the hole-flanging punch when producing a flanged Ø7 mm hole in a steel strip S355J2 + N (1.0577) with a thickness of 3 mm. The hole was flanged by a punch with a defined geometry known as a tangent ogive and described via a caliber radius head (CRH) ratio. During the process, wear of the punch made of hardened tool steel 1.3343 appeared after 20,000 strokes. Thus, a multipurpose coating TiCN-MP deposited via Lateral Rotating Arc-Cathode technology was applied on the punch to extend the punch lifetime. The coated punch was polished to remove droplets after deposition process. By applying TiCN-MP coating, 120,000 strokes were applied to reach the same wear as for the uncoated tool steel. The surface of the punch made of the hardened tool steel for uncoated and PVD coated conditions was researched by scanning electron microscopy after wear, and an energy dispersive X-ray (EDX) analysis was done to identify components of bonded material. In addition, the normal pressure on the punch active surface was studied via a numerical simulation of the hole-flanging process. The position of the high normal pressure is well correlated to the position of the adhesive wear for the uncoated and coated punches.

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Section: Introductionmentioning

confidence: 99%

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

Tomáš

Džupon

Evin

et al. 2018

Metals

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“…So, in the concept of statistical modeling, the lower the P-value, the more influential the effect. When the P-value in the analyses of variances is less than 0.05, the term is distinguished as significant (Ghoreishi et al, 2002). According to the results of analysis of variance on the entrance hole diameter, Table 7, all the main effects of four input parameters; laser power (P), laser pulse frequency (F), duty cycle (D), and the laser focal plane position (FPP) have respectively the highest influences on the diameter of the entrance hole, and all were identified as the effective linear terms.…”

Section: Entrance Hole Diametermentioning

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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“…Their investigations showed which laser parameters cause burr formation and how to minimize it. Ghoreishi et al investigated the effect of laser parameters on hole taper and circularity in percussion drilling of steels [10]. Goyal and Dubey investigated similar hole characteristics and drilling optimization in a case of titanium alloy material [11].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

et al. 2017

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Laser drilling and laser engraving are common manufacturing processes that are found in many applications. With the continuous progress of additive manufacturing (3D printing), these processes can now be applied to the materials used in 3D printing. However, there is a lack of knowledge about how these new materials behave when processed or machined. In this study, sheets of 316L stainless steel produced by both the traditional cold rolling method and by powder bed fusion (PBF) were laser drilled by a nanosecond pulsed fiber laser. Results were then analyzed to find out whether there are measurable differences in laser processing parts that are produced by either PBF (3D printing) or traditional steel parts. Hole diameters, the widths of burn effects, material removal rates, and hole tapers were measured and compared. Additionally, differences in microstructures of the samples were also analyzed and compared. Results show negligible differences in terms of material processing efficiency. The only significant differences were that the PBF sample had a wider burn effect, and had some defects in the microstructure that were more closely analyzed. The defects were found to be shallow recesses in the material. Some of the defects were deep within the material, at the end and start points of the laser lines, and some were close to the surfaces of the sample.

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Comparative statistical analysis of hole taper and circularity in laser percussion drilling

Cited by 145 publications

References 9 publications

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

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

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

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