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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Micromachining electrical grade steel using pulsed Nd-YAG lasers

Jackson M. J., Robinson G. M.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

451-454

Purpose: Multi-wavelength capability allows diode pumped, solid state (D.P.S.S.) lasers to perform operations such as micro machining in a variety of materials such as ceramics, metals and polymers. Results from this study reveal how traditional plasma-controlling gases have a detrimental effect on the surface morphology of machined components. The paper explains how the machining of thin plates of silicon steel can benefit the rapid production of electrical components such as transformer cores and dynamo pole pieces. Design/methodology/approach: A series of experiments was performed to investigate how shielding gas environment and gas pressure affect the ability to cut and machine silicon steel. The experiments were designed to show the differences between the use of various assist gases that shield the machining zone. Findings: The results of the work indicate that oxygen shielding gases allow silicon steel to be machined at a faster rate than using helium, argon and air. However, the surface roughness produced is highly dependent on assist gas used and the pressure at which it is delivered. Research limitations/implications: The results presented imply that assist gases perform a variety of functions and further research is required to understand how the assist gases improve machinability when machining different workpiece materials. Practical implications: The practical implications of this research indicate that a significant amount of research effort is required to optimize the type of assist gas used in laser micromachining of engineering materials. Originality/value: The paper reveals how assist gases interact with both laser and the surface of workpiece materials. It is practical value to microengineers and micromachinists working in the field of micro and nanomanufacturing.