Accuracy Enhancement Technologies for Micromachining Processes by Golam Kibria & B. Bhattacharyya
Author:Golam Kibria & B. Bhattacharyya
Language: eng
Format: epub
ISBN: 9789811521171
Publisher: Springer Singapore
Figure 4 presents photographs of the micro-channels created on PMMA by using pulsed Nd:YAG laser in (a) underwater and (b) open-air conditions, respectively, for the same parameter combinations. It is observed from this figure that the use of water as the surrounding medium improves the quality of the micro-channels. The use of underwater laser micro-channeling reduced the HAZ and burr formation, significantly, and also improved the quality of micro-channel walls. It is further observed that water level plays an important role during micro-channeling. Increasing the water level above a threshold value decreases the micro-channel depth and increases the formation burrs around the micro-channel, whereas decreasing the water level below the threshold results in greater amount of HAZ. The threshold level of water depends on the composition and size of the workpiece, power and wavelength of laser beam, and the interaction between laser and water during the process. The threshold value of water level for underwater (mineral water having 80–120 ppm total dissolved solids) pulsed Nd:YAG laser (1.064 μm) micro-channeling on PMMA (4 mm thick) is found to be practically 1 mm above the material surface.
Fig. 4Photograph of micro-channel created on PMMA using pulsed Nd:YAG laser a in underwater, and b in open-air conditions, respectively [49]
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