Experimental study of inverted drilling Al-7075 alloy
Tóm tắt
Al-7075 alloys are drilled using an inverted drilling method to investigate the effect of hole performances (enlargement, roundness, and surface roughness). Additionally, this study uses a gray-Taguchi methodology to optimize the multiple performance characteristics for the machining parameters in the dry drilling of Al-7075 alloy. The experimental results indicated that holes are enlarged using TiAlN- and TiN-coated drills by only 68.9% and 75.0% more than if an uncoated drill is used. The analysis of variance (ANOVA) results for the multiple performance characteristics in dry drilling Al-7075 alloys show that the spindle speed has a significant effect among all drilling parameters. Uncoated drill experiences the maximum wear, followed by the TiN-coated drill and then the TiAlN-coated drill. In an inverted drilling machine arrangement, chips fall out of the workpiece that is being drilled to prevent chips clogging and tool wear caused by secondary cutting. The values for the enlargement, roundness, and surface roughness for the inverted drilling are 95.5%, 88.8%, and 83.0% that for standard drilling, respectively. Using inverted drilling creates better hole quality and less tool wear than standard drilling.
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