CO2 Laser Cutting by Dr John Powell DSc, DIC, CEng, CPhys (auth.)

By Dr John Powell DSc, DIC, CEng, CPhys (auth.)

The laser has given production a brand new software. while the laser beam is targeted it will probably generate one of many world's so much severe strength assets, extra severe than flames and arcs, even though just like an electron beam. in truth the depth is such that it could actually vaporise such a lot recognized fabrics. The laser fabric processing has been becoming quickly because the caliber, pace and new production percentages develop into higher understood. within the fore of those new applied sciences is the method of laser slicing. Laser slicing leads since it is an instantaneous technique substitu­ tion and the laser can frequently do the activity with better flexibility, pace and caliber than its opponents. even though, to accomplish those excessive speeds with prime quality con­ siderable know the way and adventure is needed. this data is mostly conscientiously guarded via the companies involved and should be received through tough adventure and technical knowing. but during this e-book John Powell explains in lucid and nearly non­ technical language a lot of those approach wrinkles bearing on alignment, cornering, pulsing, water jets, fabric homes, slicing speeds in addition to tips with floor coating and lots more and plenty even more. it's a booklet which managers and technicians in laser activity retailers and laser processing amenities will be silly to not read.

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Focus position. g. for a l00mm lens the focal point may be positioned -1 mm above or below the sheet surface. This flexibility allows for good cutting even on non-flat sheet steel. ) Sheet condition. Local areas of moderate surface corrosion or small (± 10% ) variations of thickness can be accommodated. ) has little or no effect. Oxygen supply. If the oxygen flow to the nozzle was originally set at an optimum, variations of ±1O% can be accommodated. The process is, however, exceptionally sensitive to corruption of the purity of the oxygen supply.

Powell, CO2 Laser Cutting © Springer-Verlag London Limited 1998 24 Laser Cutting Steels This practice ensures that the cutting machine is working well inside its limits and is therefore rendered relatively insensitive to minor changes in other process parameters. A rough guide to the flexibility of the main process parameters when cutting at, say, 85% of the maximum cutting speed is Laser power. This can be increased by up to 30% or decreased by 10% without seriously affecting the process. Focus position.

The air usually contains oil and always contains water. Water and oil can contaminate the lens in the cutting head which will then start to absorb the laser beam. This absorption not only detracts from the cutting power, it can lead to permanent damage and lens fracture. It is also worth noting that as the lens warms up by beam absorption it swells and changes its focal length. This phenomenon can interrupt the cutting process as the focal point of the beam rises above the material surface. If compressor air is used for cutting or for keeping external laser optics clean it must be filtered several times.

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