A Study on Effect of Spindle Speed on Surface Roughness for Ball Nose End Mill on STAVAX Material

Tan, Jun Khang (2023) A Study on Effect of Spindle Speed on Surface Roughness for Ball Nose End Mill on STAVAX Material. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

This research study investigated the effect of spindle speed on surface roughness. The experiment was carried out on AISI 420 modified Stavax ESR in dry milling operation by using the carbide-coated ball nose end mill to obtain optimum spindle speed for minimum surface roughness. The machine that used was Tongtai CNC Milling Machine (CT-350: Five-axis Vertical Machining Center). The workpiece that used was around 200mm in length, 100mm in width and 30mm in height. The diameter of the ball nose end mill was 6mm, 2 flutes and 50mm in length. The fixed parameters are the cutting parameters for example the feed rate was set at 2000 mm/min, the depth of cut was at 0.06mm and the width of cut was 0.07mm. The spindle speeds used in the experiment were 9000rpm, 11000rpm and 13000rpm. The surface roughness of the cutting section were measured by using the Contact-type Mitutoyo Surface Roughness Tester. Besides, the surface texture of the workpiece were observed by using Leica Inverted Microscope. The outcome of this research was the average surface roughness is 2.560μm when the spindle speed was 9000rpm. For 11000rpm, the average surface roughness is 2.731μm. For 13000rpm, the average surface roughness is 2.711μm. The average surface roughness for 9000rpm is the lowest. By observing the graph at the end of 80m cutting distance, 13000rpm get highest surface roughness following by 11000rpm and then 9000rpm. So, can be concluded that when spindle speed increased, the surface roughness also increased.