Prestasi Pahat Logam Karbida Berlapis Titanium Nitrida pada Pemesinan Kering Bahan Baja Paduan Kelas Tinggi Aisi 4337

Abstract

The objective of the present research is studying the machinability of high grade steel alloy AISI 4337 under dry machining concept. The research consists of tool material selection and cutting condition for the purpose of studying on tool performance which related to tool wear progression, wear mode, wear mechanism, wear rate, tool life and formulating the tool life by using mathematical model. There were 9 (nine) cutting condition selected in this study, i,e. cutting speed (V) of 200, 250, 300 m/min, feeding (f) of 0.15, 0.20, 0.25 mm/rev, and depth of cut (a) of 1, 1.5, 2.0 mm. The limit of flank wear was set at VB of 0.1 mm, 0.3 mm and 0.6 mm and those were measured by using optical microscope. For tool failure, tool wear progression and wear mechanism observations, a scanning electron microscope was utilized. Data from experiment was compiled and analyzed by Taguchi method 4 (34 ). The tool wear progression of carbide tool coated by titanium nitride is affected, from the most to the least effect, by cutting speed, depth of cut, cutting temperature, feeding and tool geometry. In this study, the mathematical model to represent tool life in the function of cutting condition and tool rake angle is derived by using the multi linear regression method. The result shows that the optimum cutting condition obtained under dry machining is at cutting speed of 200 m/min, depth of cut 0.1 mm, feeding 0.15 mm/rev, and tool rake angle 6°. This cutting condition provides tool life as long as (t) 2434 seconds. When this cutting condition is carried out under wet machining, it is recorded that tool life is (t) 2513 seconds. The different between tool life under dry machining and wet machining is not significant. Therefore, dry machining is promising to be implemented for manufacturing industry.