ANALISIS PENGARUH PARAMETER PEMESINAN TERHADAP GEOMETRI GERAM Ti-6Al-4V PADA PROSES PEMBUBUTAN

FADHLI, MUHAMMAD and Mohruni, Amrifan Saladin (2016) ANALISIS PENGARUH PARAMETER PEMESINAN TERHADAP GEOMETRI GERAM Ti-6Al-4V PADA PROSES PEMBUBUTAN. Undergraduate thesis, Sriwijaya University.

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Abstract

Metal cutting process is the largest activity conducted in the manufacture industry. This process is able to produce components that have complex shapes with geometry accuracy and high dimensional. The rapid development of science and technology, the production should be offset with an increasing of the quality too, especially in the production process which uses tooling machines such as lathes, scrap, milling, and drilling machines. The discovery of the production machinery will facilitate the manufacture of engine components. The production tooling machines will make the manufacture of engine components be more efficient and with very high accuracy. One of machining processes used in manufacture industry is the turning process. Turning process is the machining process to produce cylindrical engine parts which done by using a lathe. Its basic form can be defined as the process of the external cylindrical surface objects machining by rotating a workpiece installed on the chuck and then imposed on the cutting tool driven in parallel translational to the turning axis of the specimen. There are five basic elements of the turning process, such as cutting speed, feeding speed, depth of cut, cutting time and rate of metal removal. In this study, the data collecting used central composite design (CCD) by establishing three machining conditions, that were cutting speed (Vc), feeds (fz) and the depth of cut (a) with α=1.682 and 18 tries. The variable data taken based on the best conditions for lathing that came from material of chisel, specimen used and the condition of the machine used. To see the chip geometry from Ti-6Al-4V material with three variations of parameters using a lathe BD-1336-T and carbide cutting tool. These parameter variations, Vc (15.28-44.56 m/min), fz (0.0007- 0.044 mm/put), and a (0:32 to 1:01 mm) were set as the cutting conditions. After the machining parameters be obtained, the next step was to make the turning process on the LAB. Manufacture of Mechanical Engineering in Sriwijaya University as chip produced in each piece taken to analyze using Optical Metrology STM6-LM in LAB CNC-CAD/CAM of Mechanical Engineering Departmen of Sriwijaya University. However, before the chip obtained, it would be cut into the desired size and then mounting beforehand to ease the process of sanding. Then the chip would be sanded using sandpaper on the grid of 400-2000 and then polishing using topical paste in this case alumina (Al2O3). The results of the final polishing would produce a layer covering the surface of the metal structure. The microstructure could be seen clearly under the microscope by removing these layers by etching. The etching materials used in this study were 1-3 ml HF, HNO3 2-6 ml and 100 ml DI Water. Etching process was performed by swabbing on the surface of the specimen for 20 seconds. Then, the specimen were removed and rinsed with warm water or alcohol and then dried with a compressor. After settling at least 1x24 hours, then the specimen could be observed with a microscope. This research indicated that chip morphology shaped like saw-tooth chip.The saw tooth chips formed in the cutting speed of 26.15 m/min. It was because of the adiabatic shear bands. The advent of the adiabatic shear band due to the manifestations of instability of thermomechanical produced by the large concentration presence of shear forces on the narrow layer. In addition to the above mechanical conditions, also appeared the strain localized and accompanied by the growth amount of the temperature required for the condition of adiabatic shear bands. By increasing the variety of parameters used, then chip geometry formed would be even greater. In addition to measure, the geometry chip that formed, this study also observed the microstructure chip. The results obtained were no changes in the microstructure of the specimen after the lathing process. Moreover, there was no changes of micro-structural in the adiabatic shear. This case because using the lathing process of low parameters cutting speed, so did not cause too high temperatures. Through those results, could be concluded that the Instability of thermomechanical condition was the major cause of the adiabatic shear bands that gave chip geometry shaped like saw-tooth.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Lathe, saw-tooth chip, adiabatic shear bands.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery
T Technology > TS Manufactures > TS200-770 Metal manufactures. Metalworking
Divisions: 03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User: Assoc.Prof Amrifan Saladin Mohruni
Date Deposited: 17 Jul 2019 14:37
Last Modified: 21 Jul 2019 09:37
URI: http://repository.unsri.ac.id/id/eprint/386

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