Design and test of a new step drill to reduce the operation time and increase the hole quality for CFRP materials

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Cobanoglu T., ŞEKER U.

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING, cilt.42, sa.11, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Sayı: 11
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s40430-020-02639-1
  • Dergi Adı: JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Composite, Drilling time, Aerospace, Drill, Delamination, Cylindricity, SURFACE QUALITY, UNCERTAINTY ANALYSIS, CUTTING PERFORMANCE, POINT ANGLE, DELAMINATION, PARAMETERS, COMPOSITES, FORCES, OPTIMIZATION, PREDICTION
  • Gazi Üniversitesi Adresli: Evet

Özet

The usage of the composite materials, which is light and strong, has been rising thanks to the technological developments in the aerospace industries. The most important operation in the assembly process of the parts in producing the aircraft components is drilling which constitutes 50% of the total operation time. The reduction in the workmanship costs of the drilling operation is very important for the competition. In this study, a new step drill was designed to reduce the drilling operation time for drilling of o5.94-mm holes on carbon fiber reinforced plastic (CFRP) parts. The tests were applied by using a 12,000 rpm drill motor manually to simulate the actual process and to inspect the impact of new drill geometry on the hole quality. The result indicates that double step drill geometry with 18 degrees nose angle reduces the drilling operation time by making the o5.94-mm hole in two steps instead of three steps. The cylindricity and delamination results of existing and newly designed drill geometry were compared. From results, the established new design geometry could be employed for drilling operations of CFRP materials. The time saving for one hole can be obtained as 30 s by using newly designed double step drill. The operation time can be reduced as 33% with this new drill.