Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Yarar E., Ertürk A. T., Koç F. G., Vatansever F.

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.32, ss.1-19, 2022 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32
  • Basım Tarihi: 2022
  • Dergi Adı: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1-19
  • Kocaeli Üniversitesi Adresli: Evet

Özet

The widespread use of heat treatable7075 aluminum alloy in the aerospace industry requires a

high machinability performance. The main objective of this study is to examine the

machinability and the surface quality conditions of the AA7075 material with different temper

conditions. For this purpose, various temper treatments are implemented to evaluate the impact

of microstructural properties on tool wear and the surface quality of the drilled holes. The

drilling operations have been done on O, F, T4, T6, and T7 temper conditions. Process

parameters were three different spindle speeds (715, 1520, and 3030 rev/min) and three feed

rates (0.1, 0.2, and 0.3 mm/rev) with HSS-G high-performance ground standard twist drill bit.

The present work deals with the effects of temper conditions on thrust force, drilling

temperature, tool wear, surface integrity, and chip morphology. Response surface methodology

was used in the evaluation of experiment results. The optimization results showed that while

thrust force and torque are not significantly affected by a change in spindle speed, they are

sensitive to an increase in feed rate. Heat-generation on the drill bit is the lowest at low levels

of both the feed rate and spindle speed parameters. The AA7075-T6 condition specimen was

machined with continuous chip formation, resulting in the best hole surface quality. 3D Finite

element modeling of the drilling process was carried out. Numerical analysis revealed the

drilling performance of AA7075-T6 in terms of thrust, heat generation and chip formation.