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Paper 4

Effect of Machining Parameters on Tool Wear and Hole Quality of AISI 316L Stainless Steel in Conventional Drilling

Abstract

This paper focuses on the effect of drilling parameters on tool wear and hole quality in terms of diameter error, roundness, cylindricity, and surface roughness. In this work, the drilling was conducted using uncoated carbide tool with diameter of 4 ± 0.01 mm with point angle of 135° and helix angle of 30°. The drilling was done at different levels of spindle speed (18 and 30 mmin-1) and feed rate (0.03, 0.045 and 0.06 mmrev-1). Austenitic stainless steel AISI 316L was the workpiece material. Comparatives analysis was done on hole diameter, roundness, cylindricity, and surface roughness of the drilled holes by experimentation. From the result, the hole quality characteristics are mostly influenced by cutting speed and feed rate. An exception was for circularity error where a two tail t-test for circularity error indicates that cutting speed and feed rate give no significant influence on circularity error. As the cutting speed increases, the surface roughness decreases (1.09 μm). Contrary, when the feed rate increases, the surface roughness value increases as well. For cylindricity error, lower cutting speed and lower feed rate will give better result. In terms of diameter error, feed rate influences more than cutting speed. Minimum diameter error was achieved when low cutting speed and low feed rate were employed.

Keywords

Surface roughness; Roundness; Cylindricity; Drilling Austenitic Stainless Steel

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Paper 3

Chip Formation When Drilling AISI 316L Stainless Steel using Carbide Twist Drill

Abstract

Knowledge on the chip formation mechanism during drilling is very important to deliver the chips with size and shape as expected. Long chips cannot rid smoothly over drill flutes hence should be avoided while small chips can be removed easily from the machined hole. In this study, performance of a solid carbide twist drill through drilling of AISI 316L stainless steels was evaluated in terms of chip formation. This study aims to better define and further characterize the different chips shape and dimensions as a function of tool wear and cutting conditions in drilling the stainless steel. Experiments conducted on various combinations of cutting speed (18 and 30 m min-1) and feed rate (0.03, 0.045 and 0.06 mm rev-1) to present the differences in chip formation. Optical observation and comparative analysis of flank wear of the twist drill were done. As the results of the performed experiments, the lowest cutting speed-lowest feed rate reveals better performance due to desirable chips formation on austenitic stainless steels drilling.

Keywords

Chip formation; Drilling; Stainless steel; Carbide Twist Drill.

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Paper 2

Examining the Effect of Various Vegetable Oil-Based Cutting Fluids on Surface Integrity in Drilling Steel – A Review

Abstract:

Increased attention on environmental and health impacts by industrial activities forces the manufacturing industry to reduce the mineral oil-based metalworking fluids as a cutting fluid. The advantages of using vegetable oil-based cutting fluids on tool wear and the cutting force have been reported in the literature, but those reporting the effects of their use on the surface finish of the workpiece are still lacking. This mini-review gives an overview of the influence of vegetable oil-based cutting fluids on surface integrity of steel during drilling process. Effect of the different cooling strategies on surface integrity is also presented.

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