Laser micro-drilling with nanoseconds: parametrical influences and results

Witte, Reiner; Moser, Tobias; Liebers, Rene; Holtz, R.L.

doi:10.1117/12.803908

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that the machined hole walls have good surface roughness of micron size and no visible micro-cracks are present around the edges. Comparing with the results using ns or ps lasers, there is a large amount of melt droplets redeposited on the hole edge 21 and a heat-affected zone is observed around the hole edge affecting the sharpness and quality of the hole. 22 The comparison with ns and ps laser drilling results clearly shows the advantage of fs laser drilling.…”

Section: Optical Engineeringmentioning

confidence: 94%

Micro-hole drilling and cutting using femtosecond fiber laser

2014

View full text Add to dashboard Cite

Abstract. Micro-hole drilling and cutting in ambient air are presented by using a femtosecond fiber laser. At first, the micro-hole drilling was investigated in both transparent (glasses) and nontransparent (metals and tissues) materials. The shape and morphology of the holes were characterized and evaluated with optical and scanning electron microscopy. Debris-free micro-holes with good roundness and no thermal damage were demonstrated with the aspect ratio of 8∶1. Micro-hole drilling in hard and soft tissues with no crack or collateral thermal damage is also demonstrated. Then, trench micromachining and cutting were studied for different materials and the effect of the laser parameters on the trench properties was investigated. Straight and clean trench edges were obtained with no thermal damage.

show abstract

Section: Optical Engineeringmentioning

confidence: 94%

Micro-hole drilling and cutting using femtosecond fiber laser

2014

View full text Add to dashboard Cite

show abstract

“…illumination. In the photo-thermal phase, the temperature rises above the melting or evaporation point due to absorption of laser energy by the material, and this results in the material being driven away by rapid boiling or evaporation [42,[199][200][201][202]. [8,9] Researchers have gone through various techniques and methodologies to examine the feasibility of using laser energy with the purpose of micro drilling.…”

Section: Laser Micro Drillingmentioning

confidence: 99%

“…• Due to the advantage of high speed, laser micro drilling has always shown to be a good choice in industrial application. The drawbacks of poor surface finish, recast layer and spatter formation can be reduced by optimizing the process parameters as discussed in section 5.7 [199,202,284].…”

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

View full text Add to dashboard Cite

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.

show abstract

“…A conventional milling machine knows in every moment the amount of material removed (the whole volume of the mill), but this is not so easy for a laser‐milling centre. The usual proposal to solve this problem is the development of analytical or empirical models fit to the process behaviour (Harrison et al ., ; Tani et al ., ; Witte et al ., ). However, these models always take those variables that perfectly fit the physical process as input data.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the operating conditions in a high precision industrial process using soft computing techniques

et al. 2011

View full text Add to dashboard Cite

This interdisciplinary research is based on the application of unsupervized connectionist architectures in conjunction with modelling systems and on the determining of the optimal operating conditions of a new high precision industrial process known as laser milling. Laser milling is a relatively new micro-manufacturing technique in the production of high-value industrial components. The industrial problem is defined by a data set relayed through standard sensors situated on a laser-milling centre, which is a machine tool for manufacturing high-value micro-moulds, micro-dies and micro-tools. The new three-phase industrial system presented in this study is capable of identifying a model for the laser-milling process based on low-order models. The first two steps are based on the use of unsupervized connectionist models. The first step involves the analysis of the data sets that define each case study to identify if they are informative enough or if the experiments have to be performed again. In the second step, a feature selection phase is performed to determine the main variables to be processed in the third step. In this last step, the results of the study provide a model for a laser-milling procedure based on low-order models, such as black-box, in order to approximate the optimal form of the laser-milling process. The three-step model has been tested with real data obtained for three different materials: aluminium, copper and hardened steel. These three materials are used in the manufacture of micro-moulds, micro-coolers and micro-dies, high-value tools for the medical and automotive industries among others. As the model inputs are standard data provided by the laser-milling centre, the industrial implementation of the model is immediate. Thus, this study demonstrates how a high precision industrial process can be improved using a combination of artificial intelligence and identification techniques.

show abstract

Laser micro-drilling with nanoseconds: parametrical influences and results

Cited by 8 publications

References 0 publications

Micro-hole drilling and cutting using femtosecond fiber laser

Micro-hole drilling and cutting using femtosecond fiber laser

A review of modern advancements in micro drilling techniques

Optimizing the operating conditions in a high precision industrial process using soft computing techniques

Contact Info

Product

Resources

About