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

Öz

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 length/diameter 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 mm/rev), three cutting speeds (200-250-300 m/min) 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 length/diameter 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.

Anahtar Kelimeler

• AA 2024-T351
• U drill
• deviation from diameter
• circularity,
• cylindricality

Proje Numarası

07/2019-08

Farklı özelliklere sahip U matkaplar ile AA2024-T351’in delinmesinde çaptan sapma, dairesellik ve silindirikliğin incelenmesi

Öz

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 uzunluk/çap 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 mm/dev), üç adet kesme hızı (200-250-300 m/dak) 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 uzunluk/çap 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.

Anahtar Kelimeler

• AA 2024-T351
• U matkap
• çaptan sapma
• dairesellik
• silindiriklik.

Destekleyen Kurum

Gazi Üniversitesi Bilimsel Araştırma Projeleri Birimi

Proje Numarası

07/2019-08

Teşekkür

Gazi Üniversitesi Bilimsel Araştırma Projeleri Birimi tarafından 07/2019-08 kodu ile desteklenmiştir. Desteklerinden dolayı araştırmacılar Gazi Üniversitesi BAP birimine teşekkür ederler.

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