Quality Investigation Of Circular Laser Cutting

Low , Kah Huey (2006) Quality Investigation Of Circular Laser Cutting. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Laser cutting IS one of the most common types of laser material processmg technology. It is a process of shaping or removing a work piece into desired geometry. It has become widely used in current industries due to its wider machining capability. flexibility and high precision in producing intricate and complex design part. Trepanning however is a process of internal contouring or hole making process on a work piece. There are geometrical errors (circularity & taper hole) which existed in most of the laser hole. nus is an experimental based quality investigation on stainless steel (5 mm) with trepanned straight through 20 mm diameter hole using a maximum capacity of 3kW C02 laser machine. Pressure. frequency and duty cycle variation were made while maintaining the power at 2.7 kW and cutting speed at 800 mm/miri which were set during the machining process. Nitrogen gas was used as assisted gas. Corucal nozzle with diameter 2.0 mm was used and maintained at standoff distance (SOD) of 1 mm above the work piece. A lens with focal length 7.5'. was used to foc us laser beam at focal distance (FD) 3.0 mm downwards from material surface. The quality investigations focus on the straightness and circularity which aims in obtairung mirllmum tolerance of hole for mating part purpose. The quality investigation was performed using WENZEL LH 54 CMM machine and calculations of straightness and circularity was done manually according VOL YO corporate standard, STD 5062, 2E.

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