Analysis of change in material composition due to machining

Abstract

In fact it is, no doubt watched that while machining when chips shaping happen high measure of hotness is created because of shearing movement of chips and the contact demonstrations between chip surface and workpiece surface and in addition it assume its part on instrument surface and chip surface. Because of high bring up in temperature, blazing of carbon particles happen hence the synthesis of carbon substance of workpiece surface and chips shifts which is reflected by the different colors of chips. In this paper the study have been carried out for figuring the change in carbon content because due to different depth of cut during machining. Effect of various machining parameters on surface roughness are studied with the help of full factorial design of experiments (DOE) and determined the best combination of machining parameters such as depth of cut, feed and cutting speed. It is observed from the ANOVA that feed (60.85%) is the most significant parameter followed by cutting speed (24.6%) and the two level interactions were also found to be significant between cutting speed feed (6.23%) and depth of cut-feed (2.62%) on surface roughness. From the experimentation it is found that, depth of cut did not impact the surface roughness in the studied range, significantly. The most optimal results for surface roughness were observed when cutting speed was set at 150 m/min and feed of 0.05 mm/rev. The present research work on turning of hardened AISI 340 steel with CVD multilayer coated carbide insert will be useful for the advanced engineering industries those are working in the field of precision machining.(3) BUE formation on the cutting tool caused an increase in the tool nose radius on the cutting tool surface. This BUE formation at lower cutting speeds (200 m/min) positively affected the surface roughness. BUE and BUL formed at greater amounts on the surface of the cutting tool at 200 m/min and 300 m/min cutting speeds, whereas BUE and BUL formation was observed at lesser amounts at 400 m/min and 500 m/min cutting speeds. Maximum BUE and BUL formation occurred during the machining process at 200 m/min cutting speed. 500 m/min and higher cutting speeds were determined for the selection of cutting speed to prevent BUE and BUL formation when machining AA2014 (T4) alloy with an uncoated seventieth carbide cutting tool. The minimum cutting force depending on the cutting speed and feed rate (137 N) was determined at 500 m/min cutting speed and 0.10 mm/rev. in this study. The maximum cutting force value (390 N), on the other hand, was determined at 200 m/min cutting speed and 0.30 mm/rev feed rate. The minimum average surface roughness value (0.93 μm) was determined at 500 m/min cutting speed and 0.10 mm/rev feed rate in this experimental study. The maximum average surface roughness value (5.34 μm), on the other hand, was determined at 300 m/min cutting speed and 0.30 mm/rev feed rate.(4)