The effect of drilling parameters for surface roughness in drilling of AA7075 alloy

Abstract

Abstract. AA7075 aluminum alloy has been very popular significantly interest in the production of structural components in automotive and aviation applications due to its high strength, low density, good plasticity and better machinability comparable to many metals. Particularly, final products must have uniformly high quality to ensure essential safety standards in the aircraft industry. The optimization of hole quality which can variable according to tool geometry and drilling parameters is important in spite of high machinability rate of AA7075 alloy. In this study, the effects of drilling parameters on average surface roughness (Ra) has been investigated in drilling of AA7075 with tungsten carbide drills. Machining experiments were performed with three different drill point angles and three different levels of cutting parameters (feed rate, cutting speed). The effects of drilling parameters on thrust force has been determined with ANOVA in %95 confidence level. Feed rate was determined as the most important factor on Ra according to ANOVA results. Moreover, it was shown that increasing feed rate leads to increase of Ra while increasing drill point angle leads to decrease of Ra. The optimum surface roughness was obtained with point angle of 130°, cutting speed of 40 m/min and feed rate of 0.1 mm/rev, thereby the validity of optimization was confirmed with Taguchi method.

Assessments of Process Parameters on Cutting Force and Surface Roughness during Drilling of AA7075/TiB2 In Situ Composite

“…Comparing the research findings of Zhaoju et al [ 28 ], the present study proves that the best filler improves the surface roughness. Figure 10 a, b exhibits the morphology of BUE formed in a flank surface of the tool during drilling of AA7075/ 0 wt.% TiB 2 AMC at drilling speed of 1000 m/minute.…”

“…Yasir et al [ 27 ] studied SiC and alumina reinforced Al 6061 fusion composite and reported that the wear resistance of 15 wt.% filler reinforced hybrid composite is better than that of 5 wt.% filler reinforced composite. Zhu et al [ 28 ] conducted a drilling of aluminum 2024-T351/titanium Ti6Al4V stack and studied the mechanism of chip formation. Krischner et al [ 29 ] conducted drilling on Al/SiG/Graphite hybrid composite and reported influencing factors on surface roughness.…”

Feasibility of tool configuration and the effect of tool material, and tool geometry in multi-hole simultaneous drilling of Al2024

“…However, the authors did not discuss their results to show the significant impact of process parameters on thrust force and torque. Yaşar et al [15] found that the 𝑅 𝑎 was more affected by the 𝑉 𝑐 followed by 𝑓 while the point angle showed less impact on the 𝑅 𝑎 . It was also discussed that high 𝑉 𝑐 and 𝑓 were responsible for higher 𝑅 𝑎 .…”

Multi-objective optimization of green technology thermal drilling process using grey-fuzzy logic method

“…Therefore, the results of the present work prove that the Taguchi based grey fuzzy logic method can be effectively employed for the calculation of multi-response characteristics with a very small number of experimental trials and less time is required to attain an optimal setting for the thermal drilling process. In future, to further improve this drilling process and the knowledge gathered from this algorithm the authors intend to introduce other parameters into account (cutting speed, point angle and feed rate (Yaşar, Boy, & Günay, 2017)) as well as check against novel materials (additive manufacturing).…”