Abstract
The paper focuses on laser cutting of polymer material PMMA. Specifically, the influence of optics on the engraved surface is investigated with use focal length lenses of 1.5″ 2.5″ 4″. Commercial CO2 laser ILS 3NM by Laser Tools & Technics Corp. Taiwan, was used for experimental machining.
Highlights
The selection of optimal technological conditions is dependent on the chosen material
From measured results of the removed layer by laser ablation with the depth of d it is possible to see, that during static parameter of power P and variable feed rate vf, the values changed with the change of focal distance f (Figure 4)
The lens with the focal distance 4" caused during the engraving from 20 to 60 % of feed rate the increase of the value d compared to the focal distance 1.5"
Summary
The selection of optimal technological conditions is dependent on the chosen material. Polymers are one of the youngest groups of construction materials. Chemical substances are those, which have very different properties, and their huge molecules contain mostly the atom of carbon, oxygen, nitrogen and hydrogen. Polymeric materials are solid, but during processing at high temperature and pressure, they are liquid to assume the future shape of the product. It is possible to modify the properties using various modification and additives. The plastics are light weighted; they have thermal and electrical insulation properties and no corrosion [1,2]
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