Experimental investigation of dry wet and cryogenic boring of hsla astm a36 steel aa 7075 aluminium alloy and gunmetal

Abstract

newline Hole making operation in alloys of steel, aluminium and copper finds extensive applications in the field of science and technology. the most preferred primary operation for hole making involves drilling operation. drilling being an intricate process, the hole quality produced is contrived by disparate conditions such as workpiece material, attribute of the operation, tool material, cutting zone temperature and cutting forces produced during the drilling cycle. to overcome the same, boring, a secondary operation is availed. boring is carried out to overcome the defects caused in drilling and obtain close geometric tolerance values of the hole produced. another area where boring finds its high ground is in the enlargement of holes to a non standard dimension. boring in the conventional cycle, involves generation of heat, i.e., surge in temperature in the region of the cutting zone thereby expediting the tool wear, cutting speed and forces associated during the machining cycle. in order to address this, cutting fluids play a cogent in the heat dissipation cinching an abatement in the temperature accretion in the boring cycle thereby reducing the unwarranted failures. however, the application and effect of a cutting fluid onto the tool-chip-workpiece interface is still a pondering problem. due to the surge in the speed of the boring operation, and also adopting carbide tips for chip removal the cutting fluids inability to reach the interface of cutting zone makes it imperceptible. furthermore, in conventional boring operations the usage of wet coolant is not competent to tackle the colossal temperatures in the cutting zone, also the relegation of the chips and the coolant itself is a dominant problem arising after it discharges its intended function in the machining cycle newline newline newline newline