By Dr John Powell DSc, DIC, CEng, CPhys (auth.)
The laser has given production a brand new instrument. while the laser beam is targeted it could generate one of many world's such a lot extreme strength assets, extra excessive than flames and arcs, notwithstanding just like an electron beam. in truth the depth is such that it may possibly vaporise so much recognized fabrics. The laser fabric processing has been transforming into speedily because the caliber, velocity and new production chances turn into higher understood. within the fore of those new applied sciences is the method of laser slicing. Laser slicing leads since it is an immediate technique substitu tion and the laser can frequently do the task with higher flexibility, velocity and caliber than its opponents. in spite of the fact that, to accomplish those excessive speeds with prime quality con siderable understand how and event is needed. this knowledge is mostly conscientiously guarded by way of the companies involved and should be received by way of not easy event and technical knowing. but during this booklet John Powell explains in lucid and nearly non technical language lots of those technique wrinkles relating alignment, cornering, pulsing, water jets, fabric houses, slicing speeds in addition to tips with floor coating and lots more and plenty even more. it's a e-book which managers and technicians in laser task outlets and laser processing amenities will be silly to not read.
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Extra resources for CO2 Laser Cutting
The cyclic nature of the laser-oxygen-steel reaction which generates the striations is the major clue to a full understanding of the process and many conflicting models have been put forward to explain this phenomenon. The model outlined above provides a basic introduction to the cutting mech- 26 Laser Cutting Steels 02 01 11 04 03 os 06 in 440 inlmin 400 1 10 9 360 6 320 7 260 \\ -, \ 6 5 l 4 3 2 1 0 o 240 200 ~\ \ \~ ~ , 160 \\ \. \ ~ ........... 5-1 Fig. 3. Cutting speeds for mild steel for a number of laser powers.
A 4mm diameter hole in 4mm thick sheet). 5 demonstrates this very clearly. 6mm. The holes cut in the 6mm plate are 20, 10 and 6mm diameter with a start up hole shown beneath these. 6mm diameter with, once again, a start up hole at the bottom. In each case the hole with the 1: 1 aspect ratio is clearly overheated and the cut edge has burned away from the intended line. 6 shows the top and bottom views of typical circles removed during the cutting process. These are also from 6 mm sheet and represent the centres of circles 20, 10 and 6mm diameter.
If the time interval between the two cuts in the same area is not sufficiently large the workpiece may become locally overheated and burning may occur. ) 2. If the workpiece is not adequately supported the weight of the barely attached cutout can distort the line of the cut in the final stages. 3. In the case of all but the thinnest sections, the final millimetre or so of the cut will have a discontinuity of quality as shown in Fig. 7. This feature is a result of a change in material removal mechanism as the top leading edge of the cut zone finishes cutting before the trailing lower edge.
CO2 Laser Cutting by Dr John Powell DSc, DIC, CEng, CPhys (auth.)