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Get Finest Results Fromlaser Drilling
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Posted On :
Oct-21-2011
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Article Word Count :
501
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AnoGet Finest Results Fromlaser Drillingther way of producing high quality holes is the percussion drilling. It utilizes rapid pouring of laser beam for a minute time interval.
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The drilling machines here employ varying wavelengths to attain the fine finishing in the drills. The two common techniques of laser drilling are image protection and direct write. Percussion is another technique that enhances the effects of both these techniques. Depending on the requirement of the type of the holes and required depth etc., either of the techniques is chosen.
Whereas in case of mask illumination,a mask is imaged at a plane other than that of the focus of the lens; laser beam is used at the focal point of the lens in direct write. The shape and size of the mask govern the shape and size of the holes. Mask illumination is useful for producing many holes through one mask only.
Coordination between moving masks and images can further be utilized to produce complex features over a large area. On the other hand, in case of direct write, a galvo-scanner helps rotate the focal spot and the fine kerf cutting produces desired feature sizes. The rotation in this case is not complete as partially it is fixed and rest is moved.
Percussion and trepanning:
Another way of producing high quality holes is the percussion drilling. It utilizes rapid pouring of laser beam for a minute time interval. Micromachining leads to precision and the result is a high quality hole with no residue. The edges are extremely fine as they should be. The job is so fine that if the substrates are not instantly evaporated,the quality and finishing of the drilled holes may be affected. Percussion drilling keeps the holes fine by way of evaporating the substrates.This technique works greatly with wide range of material like ceramic, quartz, polycarbonate, metal and so on.
In case you seek removal of a cylindrical core or circular disc from substrate trepanning drilling is the best option. It bases itself on overlapping laser beam. The overlapping is achieved through moving either of substrate or the first beam itself. The more the overlap, the finer is the quality of the edges in the hole. Trepanning is further used for removing the inconsistencies that come at the outset or stopping of the laser beam.
Apart from laser drilling, engraving and marking are equally important. Both of these create surface contrasts but the difference lies in that whereas laser marking uses various physical effects, engraving removes certain material depth, usual range being 0.005-0.02 inch.
The physical effects that help in marking are thermally induced surface cracks as in case of marking glass; melting followed by solidification to alter the roughness as in case of ceramics, gold, and some of the plastics etc.
Depositing target material on the marking material like quartz with ceramic target; ablation of a coating that is less conductive thermally while the base is highly conductive for heat.In case of stainless steel, wood and most of the plastics and titanium; oxidation at the surface is induced by achieving high temperatures with the help of laser beam.
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Article Source :
http://www.articleseen.com/Article_Get Finest Results Fromlaser Drilling_94912.aspx
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Author Resource :
The fineness of the job can be appreciated with results like these: you can mark numeric or alphanumeric characters as fine as of a height of 20 micron; the stroke width is 6 micron and laser engraving or laser drilling is 0.1 inch deep. You can machine symbols, logos and texts on even curved surfaces easily and with great accuracy.
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Keywords :
laser engraving, laser drilling,
Category :
Business
:
Business
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