Abstract
The harmony of the drilling machine-cutting tool-work piece is very important for producing the machine part with the ideal dimensions. For this purpose in this study, the effect of cutting forces on hole quality (surface roughness, diameter deviation and circular deviation) was investigated by 14 mm diameter uncoated and (AlCrN monolayer) coated carbide drills for drilling AISI H13 hot work tool steel on vertical machining center. Four different cutting speeds (60, 75, 90 and 108 m / min) and three different feed rates (0.15, 0.20 and 0.25 mm / rev) were used in the experiments. Cutting forces have been found to be effective in improving hole quality. Better hole quality has obtained with coated drills than uncoated drills in experiments. It has been observed that coated drills have the effect of improving the hole quality due to the operation with less cutting force and better chip evacuation.
Highlights
When the graphs are evaluated in terms of cutting speed, it was seen that the increase of the cutting speed in the drilling of the AISI H13 steel with uncoated drills caused to increase in the feed forces and decrease in the moment values
This is evidenced by the fact that in drilling with coated drills the decreasing feed force with decreasing cutting speed is less and less prone to decreasing than uncoated drills, while the cutting force obtained by MATEC Web of Conferences 129, 01042 (2017)
The following results were obtained in the drilling process of AISI H13 steel with uncoated and (AlCrN monolayer) coated carbide drills
Summary
Since a larger drilled hole than the desired dimension is cause to junk of the part or the small hole from desired dimension need to a second process as reaming. These processes lead to time lost and increased cost. In studies in literature; It is emphasized that cutting force increases with increase of feed rate and decreases with increase of cutting speed in drilling process. They observed that magnitude of the cutting forces had a negative effect on hole quality. The relationship of cutting force with hole quality in drilling process of AISI H13 steel are investigated
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