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Volume :15 Issue : 1 1988      Add To Cart                                                                    Download

Investigation into mean diameter of laser-drilled holes

Auther : BEKIR S. YILBAS AND ZAHIDE YILBAS

Department of Mechanical Engineering, Faculty of Engineering, University of Erciyes,

Kayseri, Turkey

 

ABSTRACT

 

In laser hole drilling, the plasma produced on the free surface of the workpiece plays an important role as the drilling gradually progresses. This is due to the fact that the plasma tends to absorb the laser energy which is then transmitted to the target via either reradiation or by an electron conduction process. Consequently, in order to obtain optimal hole drilling, the control of the plasma during the laser irradiation is essential. In the present work two possibilities are considered: firstly, that atmospheres of electrophilic gases (e.g. SF6, and 02,) might reduce the number density of electrons in the plasma; secondly, that operation at reduced pressure might influence the dynamics of plasma propagation. Either or both of these effects might be expected to influence plasma absorption mechanisms and, consequently, coupling of power into the workpiece. It is found that an optimum pressure exists, which is dependent upon the physical properties of the workpiece material. Moreover, the use of electrophilic gases at this pressure can increase drilling performance, judged on the basis of material removal, by an order of magnitude when compared with machining in an atmospheric pressure of air.

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