Metal cutting operations still represent the largest class of manufacturing operations where turning is the most commonly employed material removal process and there are lots of studies to investigate this complex process in both academic and industrial world. Predicting the better cutting condition during turning is of great importance as it helps in getting the Surfaces quality before machining starts. The major indication of surfaces quality on machined parts is surface roughness. Again, optimization of cutting parameters is one of the most important elements in any process planning of metal parts as economy of machining operation plays a key role in gaining competitive advantage. Control parameters being consider in this thesis are spindle speed, feed rate and depth of cut. After experimentally turning sample work pieces using the selected orthogonal array and parameters, this study expected to produce an optimum combination of controlled parameter for the surface roughness. In this work, Taguchi Design is used to identify the optimal combination of turning parameters to minimize the surface roughness. Turning experiments are carried out according to Taguchi orthogonal array L9 for various combinationsof three parameters: cutting speed, feed rate, and depth of cut. For each experiment run, the surface roughness Ra and time is measured, recorded and analysed using Taguchi method.

Among the various renewable energy resources solar energy potential is the highest in the country. The global solar radiation over India varies from 4-7 kWh/sq. m/day. The solar energy is also used for heating the air that air is applied to dry the clothes, food dehydration, natural rubber, etc. Circulation of atmospheric temperature air from solar flat plate collector and then that high temperature air is supplied to room. In India, we have 12 sunshine hours and 12 non-sunshine hours so solar air heater is limited to run only in sunshine hours. To run it night time it required external energy supply, so cost of the solar air heater is increase. Our requirement is to supply the hot air to the room up to 60 ºC to 65 º C temperatures during day and night time. To achieve such high temperature we need to modified the conventional solar air-dryer in such way that it will gives us hot air temperature in the range of 60 ºC to 65 ºC. For the use of Solar Air Dryer during night time, some form of energy storage is required during sunshine hours and that stored energy can be used during non-sunshine hours. Present work is focused towards incorporation of heat pipes with LHTES is of interest. Heat pipes increase heat transfer rates to or from the Phase change material (PCM), while maintaining small temperature differences between the PCM and heat transfer fluid (HTF) in heat pipe. This experimental setup, solar air-dryer assisted with TES unit including PCM and heat pipe. This study focuses on to the performance enhancement of flat plate collector solar air-dryer.

Abstract:The main aim of this paper is to optimise the surface roughness in conventional turning operation using Taguchi Method for the material medium carbon steel EN8. In this work cutting speed, feed rate and depth of cut are taken as performance parameters to achieve better surface roughness. Taguchi Method is used to obtained the main parametric effect on the surface roughness using there levels and factors. L9 orthogonal array is used to design the experiments. Also analysis of variance (ANOVA) was carried out with the significance factor of 95%. After the experimentation, it was found that cutting speed has more influenced on the surface roughness in conventional turning process than feed rate and depth of cut.

There are various input parameters that affects the laser cut but most widely input parameters which affects surface roughness and kerf taper are Laser Power, Gas Pressure, Cutting Speed. Optimization is done by "Taguchi Methodology". The Taguchi methodology involves reducing the variation in a process through robust design of experiment. It works mostly when there are intermediate number of variable (3-5) and when only few variables contribute significantly. The research paper tells us the optimum characteristics of surface roughness and kerf taper by using "Minitab" software. It also tells us about new trends and future scope of "LBM". Cutting parameters are adjusted such a that provide the quality of cut desired. In this research work input parameters are taken as Cutting Speed, Gas pressure, laser powers are studied. Simultaneously their optimum set is analyzed by using Taguchi Methodology from Minitab software for Surface Roughness and Kerf taper as output Parameter for the AISI-1040 Material.