Studi Tingkat Keausan Pahat Bubut Jenis High Speed Steel (HSS) Bohler Tipe Molybdenum (M2) dan Bohler Tipe Cold Work Tool Steel (A2) pada Pembubutan Baja ST 40

Abstract

The cutting tools is main tools at machining process besides turning machine and workpiece. Commonly, HSS (High Speed Steel) and Carbide is the popular cutting tools that used. HSS is cutting tools that most used in medium manufacturing and based on workpiece. There are 3 country that produce HSS cutting tools with different price, HSS BOHLER type Molybdenum is most expensive and HSS BOHLER type Cold work tools steel is cheapest. Based on the fact, there are one question why they have different price. This research use flank wear experiment to the HSS cutting tools to define ratio wear resistance to flank wear . The specimens were BOHLER RAPID EXTRA 1200 with 3/8 x 4” on size type Molybdenum and Cold work tool steel. The workpiece specimen used ST40 steel. Flank wear experiment of cutting tools had done by turning cutting tools to workpiece with cutting parameters that had given, then measured flank wear dimension (VB) using microscope that completed with dial indicator and pixel method. The result showed that MolybdenumHSS cutting tool with more expensive but higher wear resistance and tool life its more time from Cold work tool steel HSS cutting tool. Wear rate flank wear cutting tool increase with more cutting speed. Wear rate flank wear is slower than Cold work tool steel HSS. With more hardeness and carbide composition make cutting tool from HSS type Molybdenum more resistance than type Cold work tool steel HSS, so that HSS type Molybdenum have more tool live longer than HSS type Cold work tool steel.