Experimental comparison of the indexable drilling with different U drills on hole quality

Creative Commons License

Akdulum A., Kayır Y.

MACHINING SCIENCE AND TECHNOLOGY, cilt.28, sa.1, ss.1-27, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 1
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1080/10910344.2023.2286658
  • Dergi Adı: MACHINING SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Compendex, Environment Index, INSPEC
  • Sayfa Sayıları: ss.1-27
  • Gazi Üniversitesi Adresli: Evet

Özet

U drills are estimated to account for around 53% of all drilling

equipment’s market share. This study compared and contrasted

the impacts of the balance angle, the U drill length/

diameter ratio, and the extra coolant hole opened in the chip

evacuation channel on the hole quality when drilling AA

7075-T651 material. Hole quality was investigated by deviation

from diameter, deviation from circularity, deviation from cylindricality,

surface roughness, forces, and torque. Three cutting

speeds, three feed rates, and four distinct U drills were chosen

as input parameters. The studies revealed that when the U

drill’s length/diameter ratio increased, the hole quality deteriorated.

The best hole quality was nonetheless achieved by the

tool with the additional coolant hole. The higher balance

angle resulted in improved hole quality. However, it was discovered

after looking at the chips and inserts that the chatter

only happened while drilling with a U drill that had an additional

coolant hole. While the extra coolant hole opened to

the chip evacuation channel, it affected the hole quality positively

but caused chatter, which negatively affected the

inserts. The reasons for these results are discussed in detail.