Investigation of deviation from diameter, circularity and cylindricality in drilling AA2024-t351 with U drills with different properties

Aslan Akdulum; Yunus Kayır

Article Details

Investigation of deviation from diameter, circularity and cylindricality in drilling AA2024-t351 with U drills with different properties

Authors:

Aslan Akdulum | Yunus Kayır

Publisher:

Gazi University

Main Topics:

Mühendislik

Journal:

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi Vol.39 Issue 2, pp.1167-1178

Document Type:

Article

Publication Date:

11/2023

Document Language:

Turkish

Document ID (Org No.):

2001301402

pISSN:

1300-1884

Keywords:

Abstract:

 U drills are indexable insert cutting tools that are widely used in the manufacturing field for direct drilling of large diameter holes without the need for pre-drilling. It is estimated to have a 53 market share among drilling tools. U drills with the same nominal diameter are produced in different lengthdiameter ratios, although they use identical inserts. In some, an extra coolant hole is opened in the chip evacuation channel where the central insert is located. In this study, hole drilling experiments were performed to examine the effect of different U drills on output parameters deviation from diameter, circularity, and cylindricality. In the experiments, AA 2024-T351 material was drilled at a depth of 40 mm with U drills with a nominal diameter of 20 mm. Three feed rates 0.06-0.09-0.12 mmrev, three cutting speeds 200-250-300 mmin and 4 different U drills 3D-4D-4De-5D were used. While the lowest mean deviation from diameter, circularity and cylindrical values were obtained with 4De, the highest values were obtained with 5D. Output parameters increased with increasing lengthdiameter ratio in U drills other than 4De. Of the U drills with the same nominal diameter and length, 4De with an extra coolant hole produced a lower value of 68.4 in deviation from diameter, 51.2 in circularity, 74.3 in cylindricality compared to the 4D drill without extra coolant hole.

 U drills are indexable insert cutting tools that are widely used in the manufacturing field for direct drilling of large diameter holes without the need for pre-drilling. It is estimated to have a 53 market share among drilling tools. U drills with the same nominal diameter are produced in different lengthdiameter ratios, although they use identical inserts. In some, an extra coolant hole is opened in the chip evacuation channel where the central insert is located. In this study, hole drilling experiments were performed to examine the effect of different U drills on output parameters deviation from diameter, circularity, and cylindricality. In the experiments, AA 2024-T351 material was drilled at a depth of 40 mm with U drills with a nominal diameter of 20 mm. Three feed rates 0.06-0.09-0.12 mmrev, three cutting speeds 200-250-300 mmin and 4 different U drills 3D-4D-4De-5D were used. While the lowest mean deviation from diameter, circularity and cylindrical values were obtained with 4De, the highest values were obtained with 5D. Output parameters increased with increasing lengthdiameter ratio in U drills other than 4De. Of the U drills with the same nominal diameter and length, 4De with an extra coolant hole produced a lower value of 68.4 in deviation from diameter, 51.2 in circularity, 74.3 in cylindricality compared to the 4D drill without extra coolant hole.

 U drills are indexable insert cutting tools that are widely used in the manufacturing field for direct drilling of large diameter holes without the need for pre-drilling. It is estimated to have a 53 market share among drilling tools. U drills with the same nominal diameter are produced in different lengthdiameter ratios, although they use identical inserts. In some, an extra coolant hole is opened in the chip evacuation channel where the central insert is located. In this study, hole drilling experiments were performed to examine the effect of different U drills on output parameters deviation from diameter, circularity, and cylindricality. In the experiments, AA 2024-T351 material was drilled at a depth of 40 mm with U drills with a nominal diameter of 20 mm. Three feed rates 0.06-0.09-0.12 mmrev, three cutting speeds 200-250-300 mmin and 4 different U drills 3D-4D-4De-5D were used. While the lowest mean deviation from diameter, circularity and cylindrical values were obtained with 4De, the highest values were obtained with 5D. Output parameters increased with increasing lengthdiameter ratio in U drills other than 4De. Of the U drills with the same nominal diameter and length, 4De with an extra coolant hole produced a lower value of 68.4 in deviation from diameter, 51.2 in circularity, 74.3 in cylindricality compared to the 4D drill without extra coolant hole.

 U matkaplar, imalat alanında ön delik delmeye ihtiyaç duymaksızın büyük çaplı deliklerin doğrudan delinmesinde yaygın olarak kullanılan değiştirilebilir uçlu kesici takımlardır. Delme takımları içerisinde 53 oranında bir pazar payına sahip olduğu tahmin edilmektedir. Aynı nominal çapa sahip U matkaplar, özdeş kesici uç kullanmalarına rağmen farklı uzunlukçap oranlarında üretilmektedirler. Bazılarında ise merkezi ucun bulunduğu talaş tahliye kanalına ekstra soğutucu deliği açılmaktadır. Bu çalışmada farklı U matkapların çıktı parametrelerine çaptan sapma, dairesellik ve silindiriklik olan etkisini incelemek amacıyla delik delme deneyleri gerçekleştirilmiştir. Deneylerde AA 2024-T351 malzemesi nominal çapı 20 mm olan U matkaplar ile 40 mm derinliğinde delinmiştir. Üç adet ilerleme miktarı 0,06-0,09-0,12 mmdev, üç adet kesme hızı 200-250-300 mdak ve 4 farklı U matkap 3D-4D-4De-5D kullanılmıştır. En düşük ortalama çaptan sapma, dairesellik ve silindiriklik değerleri 4De ile elde edilirken, en yüksek değerler 5D ile elde edilmiştir. 4De dışındaki U matkaplarda artan uzunlukçap oranı ile çıktı parametreleri artmıştır. Aynı nominal çap ve uzunluğa sahip olan U matkaplardan ekstra soğutucu deliği olan 4De, ekstra soğutucu deliği olmayan 4D matkaba göre çaptan sapmada 68,4, dairesellikte 51,2, silindiriklikte 74,3 daha düşük değer meydana getirmiştir.

Article Details

Investigation of deviation from diameter, circularity and cylindricality in drilling AA2024-t351 with U drills with different properties

Authors:

Aslan Akdulum | Yunus Kayır

Publisher:

Gazi University

Main Topics:

Mühendislik

Journal:

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi Vol.39 Issue 2, pp.1167-1178

Document Type:

Article

Publication Date:

11/2023

Document Language:

Turkish

Document ID (Org No.):

2001301402

pISSN:

1300-1884

AA 2024-T351

U drill

deviation from diameter

circularity,

cylindricalityAA 2024-T351

U matkap

çaptan sapma

dairesellik

silindiriklik.

Issues

Article Details

Authors: Aslan Akdulum | Yunus Kayır

Publisher: Gazi University

Main Topics: Mühendislik

Journal: Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi Vol.39 Issue 2, pp.1167-1178

Document Type: Article

Publication Date: 11/2023

Document Language: Turkish

Document ID (Org No.): 2001301402

pISSN: 1300-1884

Issues

Authors:

Aslan Akdulum | Yunus Kayır

Publisher:

Gazi University

Main Topics:

Mühendislik

Journal:

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi Vol.39 Issue 2, pp.1167-1178

Document Type:

Article

Publication Date:

11/2023

Document Language:

Turkish

Document ID (Org No.):

2001301402

pISSN:

1300-1884