Investigation Of Machining Defects On Rolled Steel Plate

Ahmad Latifi, Yaacob (2007) Investigation Of Machining Defects On Rolled Steel Plate. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The aim for this study is to investigate the machining defect on rolled steel plate. In this study, the effects of cutting speed and feed rate and number of holes drilled are investigated. For this purpose, mild steel (AISI 1045) is drilled at dry machining conditions with two different types of workpiece in CNC Haas milling machine. Drilling process was carried out with 1 Omm and 20mm HSS drill diameter. The point angle of the drills has 118°, which is the recommended value for cutting materials for mild steel were used for the experiment work. Wide ranges of the feed and the cutting speed, including values recommended by general machining handbooks, were tested to find the surface roughness. The Surftest SJ-301 has used to measure the defects at drilled holes. In the experiments, depending on the types of workpiece, lowest surface roughness is found 4.34J.tm at exp 2. The highest surface roughness is presented at experiment 4 with 8.93J,tm. The results also obtained that variable cutting speed gives the influence of the surface finish at hole and the lower feed rate gives the high surface roughness value. The best parameter for the both of workpiece were found at 478rpm and feed 15mm/min for 10mm drill diameter and 239rpm and feed 19mm/min for 20mm drill diameter.

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