Investigation on the effect of laser parameters and hatch patterns on the dimensional accuracy of micro-dimple and micro-channel texture geometries

Avadhoot Rajurkar1,2, Satish Chinchanikar1
1Department of Mechanical Engineering, Vishwakarma Institute of Information Technology, Pune, India
2Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune, India

Tóm tắt

This study investigates the design, simulation and fabrication of micro-dimple and micro-channel texture geometries and the effect of laser parameters and hatch patterns on its dimensional accuracy on carbide tools. Micro-textures were fabricated using a 30-Watt pulsed 1068 ns infra-red fiber laser. The intended design width/diameter and pitch for micro-channels and micro-dimples were 80 and 190 µm, respectively, with a micro-channel depth of 70 µm. Ample simulation trials followed by pilot experiments were conducted to obtain the required geometry. An array of micro-dimples and micro-channels was fabricated by varying the laser parameters, namely laser power, frequency, and scanning speed, and with five different types of hatch patterns, namely unidirectional hatch, bi-directional hatch, ring-like hatch, two-way hatch, and gong type hatch. Mathematical models were developed for a better understanding of the effect of the laser parameters and hatch patterns on the dimensional accuracy. It has been observed that the percentage error in the intended micro-dimple dimensions decreased with the increase in laser parameters. However, the percentage error for micro-channel dimensions increased with the laser power and scanning speed and decreased with frequency. Finally, an optimized set of laser parameters and hatch patterns were obtained using the TOPSIS technique which show that two-way hatch and bi-directional hatch patterns are most prominent for both types of textured tools. Further, this study finds that the laser power of 21 W, scanning speed of 1.5–2 m/s, and frequency of 60–80 kHz yield better dimensional accuracy for the selected micro-texture geometries on carbide tools.

Tài liệu tham khảo

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