Sunil Magadum - Academia.edu (original) (raw)
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Madan Mohan Malaviya University of Technology, Gorakhpur
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In the present work micromachining of PMMA was carried out using KrF excimer laser. Excimer laser... more In the present work micromachining of PMMA was carried out using KrF excimer laser. Excimer laser pulse with a wavelength of 248 nm was generated with a coherent COMPexPro 110 excimer laser system. A micro-hole of Ø150 μm was machined on PMMA substrate during the experimentation. The PMMA substrate was mounted on the translation stage. The PMMA substrates were ex-posed to different number of pulses (1, 2, 5, 10, 20, 50 and 100) at repetition rate of 2, 5 and 10 Hz respectively by keeping the pulse energy unchanged at 200 mJ. In the present experimentation, the effect of pulse repetition rate and number of pulses on ablation depth has been investigated. The experimental results for micromachining demonstrate ablation process as a photo-chemical mechanism. The results of the experimentation have revealed that, ablation depth is directly proportional to pulse number & pulse repetition rate has no significant effects on the ablation depth.
Cryogenic coolants as cutting fluids are gaining importance as they are eco-friendly, recyclable ... more Cryogenic coolants as cutting fluids are gaining importance as they are eco-friendly, recyclable and moreover they do not produce any harmful by-products. Liquid nitrogen at -196o C is commonly used coolant in cryogenic machining. In the present work machining of SS304 was carried out on a lathe using coated carbide tool with cryogenic and flood coolants. Tests were carried out at cutting speed of 200 and 250 m/min, and the feed rate, depth of cut was kept constant at 0.2 mm/rev and 1.5 mm respectively. Coated carbide CNMG 120404 Insert was used as a cutting tool. Tool wear, tool life and cutting forces were measured. The results have revealed that cryogenic machining has yielded better tool life as compared to conventional flood machining.
Procedia Materials Science, 2014
In the present work micromachining of PMMA was carried out using KrF excimer laser. Excimer laser... more In the present work micromachining of PMMA was carried out using KrF excimer laser. Excimer laser pulse with a wavelength of 248 nm was generated with a coherent COMPexPro 110 excimer laser system. A micro-hole of Ø150 μm was machined on PMMA substrate during the experimentation. The PMMA substrate was mounted on the translation stage. The PMMA substrates were ex-posed to different number of pulses (1, 2, 5, 10, 20, 50 and 100) at repetition rate of 2, 5 and 10 Hz respectively by keeping the pulse energy unchanged at 200 mJ. In the present experimentation, the effect of pulse repetition rate and number of pulses on ablation depth has been investigated. The experimental results for micromachining demonstrate ablation process as a photo-chemical mechanism. The results of the experimentation have revealed that, ablation depth is directly proportional to pulse number & pulse repetition rate has no significant effects on the ablation depth.
Cryogenic coolants as cutting fluids are gaining importance as they are eco-friendly, recyclable ... more Cryogenic coolants as cutting fluids are gaining importance as they are eco-friendly, recyclable and moreover they do not produce any harmful by-products. Liquid nitrogen at -196o C is commonly used coolant in cryogenic machining. In the present work machining of SS304 was carried out on a lathe using coated carbide tool with cryogenic and flood coolants. Tests were carried out at cutting speed of 200 and 250 m/min, and the feed rate, depth of cut was kept constant at 0.2 mm/rev and 1.5 mm respectively. Coated carbide CNMG 120404 Insert was used as a cutting tool. Tool wear, tool life and cutting forces were measured. The results have revealed that cryogenic machining has yielded better tool life as compared to conventional flood machining.
Procedia Materials Science, 2014