PENGARUH KECEPATAN PEMAKANAN DAN WAKTU PEMBERIAN PENDINGIN TERHADAP TINGKAT KEAUSAN CUTTER END MILL HSS HASIL PEMESINAN CNC MILLING PADA BAJA ST 40

The purpose of this research was to determine the influence of feedrate variation, timing of cooling variation, and the interaction between feedrate and timing of cooling to rate wear HSS end mill cutter in machining result CNC milling with ST 40 steel. This research is an experimental research using two factor independent variable (feedrate and timing of cooling) and one dependent variable (rate wear of HSS end mill cutter). The results data of this research described using descriptive analytic method. The results of discussion with this method was enhancement of feedrate and timing of cooling the rate wear cutter increases. Type of cutter wear that occurs is flank wear and began to grow relatively quickly then followed by a relatively slow growth to a certain cutting. The smallest edge of the cutter rate wear occurs when interaction feedrate 0.11 mm/rev with a timing of cooling 10 minutes value is 562.57 μm, while the largest edge of the cutter rate wear occurs when interaction feedrate 0.15 mm/rev with a timing of cooling 20 minutes value is 958.65 μm. This research suggests that interaction between feedrate and timing of cooling has a certain influence to rate wear of HSS end mill cutter in machining result CNC milling with ST 40 steel. Keywords: CNC milling, feedrate, timing of cooling, end mill cutter, flank wea