Dissertations/Theses - Department of Industrial and Production Engineering

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Author: search.filters.author.Kamruzzaman, Md.Has files: Yes

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    Effect of applying conventional cutting fluid and liquid nitrogen on grindability of different steels
    (Department of Industrial and Production Engineering, BUET, 2004-09) Kamruzzaman, Md.; Dhar, Dr. Nikhil Ranjan
    Strained environment is a global problem. In melal industries the USB of coolarlt has become more problematic In terms of both employee health and enVIronmental pollution. It is said thaI the use of coolant forms approximately 8-16 % of the total production cost. The traditional methods that use coolants are now obviously becoming obsolete. Hence, it is clear that uSing a dry Gutting system has great implications for resource preservation and waste reduction. For this purpose, a new Gooling system is designed for dry cutting. This research work presents an eco-friendly cooling Innovation and the benefit gained by using this method. In order to compare the performance of usmg thiS system, grinding experiments were carried out on dry and flood cutting environment In different infeed condition The present work investigates the role of cryogenic cooling by liquid nitrogen jet on chip formation, grinding zone temperature arid surface roughness in grinding steels. The experimental results indicate Significant reduction irl cutting temperature on application of cryogen, whiCh enables favorable chip formatioll It was also Iloted that cryogenic grinding prOVide relatively more surface roughness for less plastic deformatioll and rubbing, shearing and fracturing modes of chip formation and retention of the grit's sharpness. Therefore, it appears that cryogenic cooling, if properly employed, Ilot only provides ellvironment frielldllness but can also Improve the grlndability characteristics.
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    Effects of high pressure coolant on machinability of steels
    (Department of Industrial and Production Engineering, BUET, 2009-12) Kamruzzaman, Md.; Dhar, Dr. Nikhil Ranjan
    I-ligh production machining aLhigil culling speed and iCed rate generates lurge heat and high culling lemperature. which shortens the tool life and deteriorate, tile job qllality. Thi" problem becomes more aelile wh~n thcjob; nrc difficllh to macbin~ and arc to be lIsed under Jynamic loadillg. The conventional culling fluids nrc not that effcctive in ,uch high production machining parlicularly in continuous cultlng of mutcrials Iikc stcels. Further lhe convcntional culling fluids ure nol ~nvironll1entally friendly. The di,po~al of lhc culling tluid; oli.cn lead; LOlocal water pollution and soil contaminution. Recycling and rcu,e of convcntional cutting l1uids also lcad to otbcr problem,. M~cbining of sof\. ,t,cky ~lld dllctil~ l1l~lC";"I,yidd, long conllllUOUScbips and rapid tool wear due 10 inctrLcLcnl action of lh~ CUllingl1uisure coolant ;ystem increa,ed tool life by 30% to 75% whcn turning C-60 steel by SNMG in;CI't and 80% to 140% when machining by SNMM insert, Tile suri'ace qU"lity of the machined ,urfa~e imprQvcd po"ibly duc to 1e1o,crdumage of the C11(!ingtool no,e. In ordcr to implemcnt the high-pressure cQo[ant machining technology, an analyticalmodd for cutting temperature has been developed. It is fmmd that ac~orJing to the ,elccted cutting condilions in the model-bascd comparisons, the prcdicted cutting tcmperalllrc under high pressure coolant conditions is rcduccd as higb as about 18% eomp~red with tho"~ in dJ)' culling.