Investigation on Drilling of Banana Fibre Reinforced Composites

Abstract

India offered a biggest source of natural fiber like banana, rice husk, coconut and jute fiber etc. All the natural fiber has its unique advantages as well as mechanical properties which are very useful in the development of potential composites for various applications like transportation, automotive etc. There are various machining process in which drilling is most useful process for the assembly of different work pieces. During the drilling of composites it will undergo in the delamination process, which in turn reduces the strength as well as the efficiency of composites materials. In the present work drilling was carried out by using the various feeds (0.1, 0.2, 0.3 mm/rev), speeds (1000, 2000, 3000 rpm) and drill point angles (90 0 , 104 0 , 118 0) on the banana polyester reinforced composites. The delamination factor was measured by using machine vision system and digital image analysis. The mathematical model were developed using regression analysis to correlate the various machining parameters with the delamination factor and thrust force. Also the ANOVA has been used to found the effectiveness of the factors as well as their combinations. Optimization has been performed using the desirability function to find out the optimum machining condition for drilling of banana fibre reinforced composites.

Natural fiber–reinforced composites: A review on material, manufacturing, and machinability

“…It has been reported that the drilling damage tendency at hole entry and exit decreases with increasing point angle. 75 Table 4 lists some of the reported drilling conditions by several researchers and their concluding remarks when drilling various NFRC laminates. As can be seen from the table, because of different properties presented by different natural fibers and matrices, as well as their different manufacturing methods, it is hard to provide particular guidelines on selecting the important process parameters in order to improve the machinability of these composites.…”

Review on effect machining parameters on performance of natural fibre–reinforced composites (NFRCs)

“…Venkateshwaran and ElayaPerumal 49 found that the effect of feed rate is more on delamination than speed. Patel et al 50 showed that the delamination at hole entry declines and at hole exit increases with the higher point angle. Table 5 summaries the important drilling studies on NFRCs by researchers.…”

Factors affecting hole quality during drilling of natural fiber-reinforced composites: A comprehensive review

“…Surface roughness has been reported to increase with increase in spindle speed and feed rate. 29,30 Meanwhile, drill types, such as high-speed steel (HSS) twist drill, multi-construction twist drill and brad and spur types, were reported to affect surface roughness of drilled holes significantly. 31 Microcracks may occur during drilling when the composite is subjected to drilling forces.…”

“…Feed rate usually determines the end result of the drilled holes quality. 29 By reducing the feed rate, delamination at the entry and exit could be reduced, as lower thrust forces are generated. In combination of spindle or cutting speed and feed rate, high spindle speed and lower feed rate is adjusted to achieve lower delamination.…”