Presently a-days precision manufacturing has picked up its significance in all assembling industries. The best product dimensions at low cost with minimum time become a measure of concern. The drilling process imparts more than 30% of all the metal removing operations done on a job or assembly. The burr is a plastically deformed material, generated during drilling is unnecessary output and reduces the product acceptability, often lowers the surface quality of the product requires deburring which increases the cost of product. Burr is caused due to improper machining, tooling and environmental parameters. Total elimination of burrs during drilling process is a difficult task but using proper process parameters it can be minimized. In the present experimental study, the optimization of process parameters for minimization of burr formation in drilling process has been carried out for Al6082 plate. The tool type (coated/uncoated), spindle speed, feed rate, and drill diameters were used as the process parameters. Taguchi’s L18 orthogonal has been applied for DOE and drilling of Al6082 plates has been performed using ply-board as a backup support and without using any backup support on CNC drilling machine. The burr height and surface roughness were analyzed and optimized using S/N ratio and ANOVA and the optimum combinations for burr height and surface roughness has been found from S/N plots. The most influencing factors for burr height and surface roughness have been found from ANOVA tables.

No abstract

Oil wells which produce high acidic crude especially asphalt-base crudes tend to yield naphthenate (cycloparaffin) as deposits. This is a major flow assurance issue as it reduces the oil production in the wells as it creates restriction in the well's tubing and also causes napthenate induced emulsion. The objective of this work is to focus on diagnosis of oil producing well which have the tendency on forming napthenate deposits along with inorganic scale/corrosion product. In this paper, two wells from an oilfield offshore of East Malaysia were used as a case study to detect the presence of naphthenate. Analytical testing was conducted on the downhole deposite samples of those wells. Tests such as total acid number (TAN) analysis, cationic and anionic analysis on water, pH of crude and also x-ray diffraction (XRD) on deposit were conducted to understand the occurrence of the napthenate solid. A specialty micro-emulsion formulation was designed to improve the productivity of the well by injecting into the tubing/around wellbore to dissolve/disperse these napthenate deposits embedded with inorganics. One of the well of the case study Well BM-1 is diagnosed to have its production impaired by napthenate deposition. It was observed that production drop from 1200 bpd to 300 bpd in 7 years. During this period, skin increased from 30 to 65. After the treatment, the liquid rate increased to 700 bpd with significant reduction in water cut. The application of this study is to provide a guideline towards early detection of naphthenate and possible chemical remedial to revive the well productivity. Thus, promotes preventive measures and mitigation plan which can be devised and replicated.

Abstract:rilling is a process of producing round hole in a solid job by cutting tool having multitooth called twist drill. It is an esteemed process from all machining processes. It has been concluded from a surveys that drilling operation imparts more than 30% of all the metal removing operations done on a job or assembly. But there is problem occur during drilling called burr formation. Burr formation at the entering side and exit side is a very serious problem in assembly making components, which is caused by the improper machining parameters like spindle speed, diameter of twist drill, lip angle, feed, material to be drill, tool geometry, tool material etc. Excessive feed rate, lower spindle speed, higher diameter of twist drill are the causes of higher delamination or burr formation, which requires deburring which increases the cost up to 20% So a serious focus is required to minimize the burr formation. One of the popular method to reduce burr formation is to use cryogenically treated tools which are helpful to minimize the burr formation and to increase the finishing of hole.

Abstract:rilling is a metal cutting machine process used to create hole of circular cross section by employing a drill bit. The circular cross section holes size varying in range of small to large.Several types of drill bits like H.S.S., carbide tool, TiN and TiAlN coated carbide and HSS twist drill etc. are used for drilling process in industries. The drilling operation is affected by various input parameters like cutting speed, feed rate, depth of cut, cutting fluid, drill diameter, point angle etc. The various experiments have been done on CNC drilling machine.There are various materials like steel, composite material (like C.F.R.P, ALalloy), and MMC being used for analysis of drilling operation.