Relevant Geometric Features in the Percussion Laser Microdrilling of Different Alloys

Volume 3 ◽  
2004 ◽  
Author(s):  
Paola Bassani ◽  
Edoardo Capello ◽  
Enrico Gallus ◽  
Elisabetta Gariboldi ◽  
Luca Longoni ◽  
...  
Keyword(s):  
Process Parameters ◽  
Pulse Energy ◽  
Pulse Length ◽  
Pulse Frequency ◽  
Laser Drilling ◽  
Laser Source ◽  
Drilling Process ◽  
Geometric Features ◽  
Hole Shape ◽  
Laser Sources

In the recent decade the laser drilling process has continually attracted new interests and has found increasing applications in the industry. Nowadays the most common industrial laser sources for laser drilling are the solid state ones with pulse length of the order of milliseconds, even if nanosecond and femtosecond pulse sources can also be found in industrial applications. The latter, short and ultrashort laser sources, are very promising since they are expected to generate the hole directly by vaporisation, leaving the hole surfaces free of molten and resolified layer, as well as very low amount of spatter. This paper reports an experimental study on microhole laser machining and on influence of some process parameters on the hole shape. The laser source used in the study was a pulsed, diode pumped, Q-switched Nd:YAG laser. The materials investigated were four different alloys (AISI 304 stainless steel, cp titanium, CuZn35 brass and IN718 alloy), provided as 0.5 mm thick commercial sheets. Since an experimental approach has been here preferred, the performed experimental plan has been designed by the analysis of variance technique. The influence of material type, as well as laser process parameters, like pulse frequency and pulse energy, have been investigated. Relevant geometrical features, like top and bottom hole diameter, taper angle, top and bottom aspect ratio, have been measured and analysed. Moreover, the geometric features of the top spatter as well as the metallurgical characteristics of heat affected zone has been investigated. The results have shown that pulse energy strongly affects both geometric and metallurgical hole features. On the other hand, pulse frequency does not seem to influence the hole shape in all material. The presence of spatter and metallographic analysis confirmed the production of molten layers in all material mainly around the hole entrance.

scholarly journals Analysis and optimization of laser drilling process during machining of AISI 303 material using grey relational analysis approach

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
V. Chengal Reddy ◽  
Thota Keerthi ◽  
T. Nishkala ◽  
G. Maruthi Prasad Yadav
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Grey Relational Analysis ◽  
Pulse Frequency ◽  
Laser Drilling ◽  
Simultaneous Optimization ◽  
Fibre Laser ◽  
Drilling Process ◽  
Relational Analysis ◽  
Grey Relational

AbstractSurface roughness and heat-affected zone (HAZ) are the important features which influence the performance of the laser-drilled products. Understanding the influence of laser process parameters on these responses and identifying the cutting conditions for simultaneous optimization of these responses are a primary requirement in order to improve the laser drilling performance. Nevertheless, no such contribution has been made in the literature during laser drilling of AISI 303 material. The aim of the present work is to optimize the surface roughness (Ra) and HAZ in fibre laser drilling of AISI 303 material using Taguchi-based grey relational analysis (GRA). From the GRA methodology, the recommended optimum combination of process parameters is flushing pressure at 30 Pa, laser power at 2000 W and pulse frequency at 1500 Hz for simultaneous optimization of Ra and HAZ, respectively. From analysis of variance, the pulse frequency is identified as the most influenced process parameters on laser drilling process performance.

A Parameters Optimization of the CO2 Laser Drilling Process for HDI Microvia Fabrication

2012 ◽  
Vol 214 ◽  
pp. 451-454 ◽  
Author(s):  
You Zuo Hu ◽  
Wei He ◽  
Wei Dong Xue ◽  
Zhi Hua Tao ◽  
Yu Xing Huang ◽  
...  
Keyword(s):  
Pulse Width ◽  
Printed Circuit Boards ◽  
Laser Energy ◽  
Experimental Parameter ◽  
Laser Drilling ◽  
Parameters Optimization ◽  
Laser Source ◽  
Drilling Process ◽  
Beam Diameter ◽  
Via Holes

The blind via holes formation by laser drilling is one of the key technologies for demanding high density interconnect printed circuit boards. In this paper , the drilling conditions of drilling the blind via holes and the quality of the drilled holes are examined using a CO2 laser source against the FR4 board without copper foil.We chose laser energy,pulse shot,pulse width and diameter of beam as the experimental parameter . The results showed that laser energy and beam diameter played a more important role on changing the blind vias’ diameter than pulse shot and pulse width .While the pulse shot and pulse width take more important role in changing the depth of vias.

scholarly journals An integrated analysis of productivity, hole quality and cost estimation of single-pulse laser drilling process

2020 ◽  
pp. 095440542096816
Author(s):  
Shoaib Sarfraz ◽  
Essam Shehab ◽  
Konstantinos Salonitis ◽  
Wojciech Suder ◽  
Misbah Niamat ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Flow Rate ◽  
Pulse Energy ◽  
Gas Flow ◽  
Single Pulse ◽  
Laser Drilling ◽  
Drilling Process ◽  
Gas Flow Rate ◽  
Hole Quality ◽  
Drilling Cost

Laser drilling is a well-established manufacturing process utilised to produce holes in various aeroengine components. This research presents an experimental investigation on the effects of laser drilling process parameters on productivity (material removal rate), hole quality (hole taper) and drilling cost. Single-pulse drilling was employed to drill a thin-walled Inconel 718 superalloy plate of 1 mm thickness using pulsed Nd:YAG laser. The experiments were designed using Box-Behnken statistical approach to investigate the impacts of pulse energy, pulse duration, gas pressure and gas flow rate on the selected responses. Multi-objective optimisation was performed using response surface methodology (RSM) based grey rational analysis (GRA) to identify optimal drilling conditions aiming to maximise the MRR and minimise hole taper and drilling cost. The optimal combination of drilling parameters was found as pulse energy of 20 J, pulse duration of 6 ms, gas pressure of 100 psi and gas flow rate of 40 mm3/s. A detailed cost analysis identified labour cost, gas consumption and machine costs as the major cost elements of the laser drilling process.

High-Speed Fabrication of Microchannels Using Line-Based Laser Induced Plasma Micromachining

2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Ishan Saxena ◽  
Rajiv Malhotra ◽  
Kornel Ehmann ◽  
Jian Cao
Keyword(s):  
Process Parameters ◽  
Optical System ◽  
Pulse Energy ◽  
High Speed ◽  
Microfluidic Devices ◽  
Pulse Frequency ◽  
Free Form ◽  
Laser Induced Plasma ◽  
Circular Spot ◽  
Energy Pulse

Microtexturing of surfaces has various applications that often involve texturing over large (macroscale) areas with high precision and resolution. This demands scalability and speed of texturing while retaining feature sizes of the order of a few microns. Microchannels are a versatile microfeature, which are often used in microfluidic devices and can be arrayed or joined to form patterns and free-form geometries. We present a technique to fabricate microchannels on surfaces with high-speed and by using a multimaterial process, namely, laser induced plasma micromachining (LIPMM). The process has the potential to machine metals, ceramics, polymers, and other transparent, brittle, and hard-to-machine materials. The presented technique uses an optical system to modify the laser spot into the shape of a line, to fabricate microchannels directly without scanning as in the case of a regular circular spot. The process schematics are shown, and micromachining experiments on polished aluminum are discussed. Moreover, it is shown that the depth and width of the channels may be varied by changing process parameters like the pulse energy, pulse frequency, and number of exposures.

Different modulation schemes for direct and external modulators based on various laser sources

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hazem M. El-Hageen ◽  
P.G. Kuppusamy ◽  
Aadel M. Alatwi ◽  
M. Sivaram ◽  
Z. Ahamed Yasar ◽  
...  
Keyword(s):  
Rate Equation ◽  
Simulation Software ◽  
Optical Systems ◽  
Laser Source ◽  
Optical Link ◽  
Input And Output ◽  
Modulation Techniques ◽  
Different Types ◽  
Laser Sources ◽  
Modulation Schemes

AbstractDifferent types of laser source modulation techniques have been used in various applications depending on the objective. As optical systems extract the laws and the best solutions from experiments and simulations, the present study uses simulation software with different modulation types so the output signals can be compared. The modulators used are Mach-Zehnder, which is an external modulator, and electro-absorption modulator and laser rate equation modulator, which are direct modulators. All these types have an optical link multimode (MM) fiber with a photodiode in the receiver end that can be modeled. The input and output signals are analyzed using different types of modulations.

Machinability study and optimization of CNC drilling process parameters for HSLA steel with coated and uncoated drill bit

2021 ◽  
Author(s):  
Nitin P. Sherje ◽  
Sameer A. Agrawal ◽  
Ashish M. Umbarkar ◽  
Prashant P. Kharche ◽  
Dharmesh Dhabliya
Keyword(s):  
Process Parameters ◽  
Hsla Steel ◽  
Drilling Process ◽  
Drill Bit

scholarly journals Optimization of Drilling Process Parameters Via Taguchi, TOPSIS and RSA Techniques

2017 ◽  
Vol 62 (3) ◽  
pp. 1803-1812 ◽  
Author(s):  
K. Shunmugesh ◽  
K. Panneerselvam
Keyword(s):  
Process Parameters ◽  
Feed Rate ◽  
Research Work ◽  
Cutting Speed ◽  
High Strength ◽  
Drilling Process ◽  
Drill Bit ◽  
Influence Of Process Parameters ◽  
Light Trucks ◽  
Cfrp Composite

AbstractCarbon Fiber Reinforced Polymer (CFRP) is the most preferred composite material due to its high strength, high modulus, corrosion resistance and rigidity and which has wide applications in aerospace engineering, automobile sector, sports instrumentation, light trucks, airframes. This paper is an attempt to carry out drilling experiments as per Taguchi’s L27(313) orthogonal array on CFRP under dry condition with three different drill bit type (HSS, TiAlN and TiN). In this research work Response Surface Analysis (RSA) is used to correlate the effect of process parameters (cutting speed and feed rate) on thrust force, torque, vibration and surface roughness. This paper also focuses on determining the optimum combination of input process parameter and the drill bit type that produces quality holes in CFRP composite laminate using Multi-objective Taguchi technique and TOPSIS. The percentage of contribution, influence of process parameters and adequacy of the second order regression model is carried out by analysis of variance (ANOVA). The results of experimental investigation demonstrates that feed rate is the pre-dominate factor which affects the response variables.

scholarly journals Analyses of process parameters influence on the drilling process by using carbide drills for steel St52-3

2017 ◽  
Vol 94 ◽  
pp. 02011 ◽  
Author(s):  
Ioan Alexandru Popan ◽  
Alina Ioana Popan ◽  
Sorin Cosmin Cosma ◽  
Alexandru Carean
Keyword(s):  
Process Parameters ◽  
Drilling Process

scholarly journals Significant Reduction in Energy Consumption and Carbon Emission While Improving Productivity in Laser Drilling of CFRP Sheets with a Novel Stepped Process Parameter Parallel Ring Method

2022 ◽  
Vol 6 (1) ◽  
pp. 7
Author(s):  
Menghui Zhu ◽  
Chao Wei ◽  
Wei Guo ◽  
Zhizhou Zhang ◽  
Jinglei Ouyang ◽  
...  
Keyword(s):  
Ring Laser ◽  
Energy Input ◽  
Processing Parameters ◽  
Laser Drilling ◽  
Parent Material ◽  
Hole Drilling ◽  
Drilling Process ◽  
Cfrp Sheets ◽  
Hole Drilling Method ◽  
Drilling Quality

Although laser drilling of carbon fibre-reinforced polymer (CFRP) composites offers the advantages of zero tool-wear and avoidance of fibre delamination compared with mechanical drilling, it consumes considerably more energy during the drilling process. This research shows that by using a new, stepped parameter parallel ring laser hole drilling method, an energy saving of 78.10% and an 18.37 gCO2 reduction for each hole, while improving productivity by more than 300%, can be achieved in laser drilling of 6 mm diameter holes in CFRP sheets of 2 mm in thickness, compared with previous laser drilling methods under the same drilling quality. The key reason for this is an increase in energy input to the inner rings enabling more rapid removal of the material, while the lower energy input for the outer ring provides a shielding trench to reduce the heat loss into the parent material. The results are compared with single-ring laser drilling and multiple-ring laser drilling with constant processing parameters, and a discussion is given on comparing with mechanical drilling and future prospects, including a combined mechanical drilling and laser pre-scribing process.

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