A Numerical Modelling of V-Bending

Yıl 2024, , 545 - 554, 11.07.2024

Ergin Kosa

https://doi.org/10.21605/cukurovaumfd.1514639

Öz

In the study, a sheet metal is bent to analyze the punch force, Von Misses stresses and plastic strains on the metal for friction and non-friction cases. The 2-D v-bending forming is modelled in program. Model includes a die, a punch and a blank. Solid mechanics physics interface has been used in program. The analyze has been run with friction and non-friction cases for different strain-hardening exponents and sheet metal thicknesses. The sheet lengths and widths are 60 mm. Thickness of sheet metal is varied between 1.0 to 3.0 mm. The strain hardening exponent has been altered from 0.1 to 0.5. It is computed that the punch force has been increased as thickness of sheet metal and strain hardening exponent decreases. The achieved maximum punch force is at values of 1.12x105 N, 3.75x105 N and 4.05x105 N for thickness of 1.0-mm, 2.0-mm and 3.0-mm respectively when strain hardening exponent is 0.3. Also, as the strain hardening exponent increases from 0.1 to 0.5, the maximum punch force lowers from 2.03x105 N to 8.08x104 N for 1 mm thickness at friction case. Moreover, the maximum punch force reached up to 9.13x104 N for 1 mm thick sheet metal at non-friction case when the strain hardening exponent is 0.1. It is concluded that the maximum Von Misses stress has been calculated at the tip of sheet metal.

Anahtar Kelimeler

Numerical, Sheet metal, Punch, Thickness, V-bending, Strain hardening exponent

V- Bükmenin Sayısal Modellenmesi

Öz

Çalışmada, sürtünmeli ve sürtünmesiz durumlar için zımba kuvvetini, Von Misses gerilmelerini ve metal üzerindeki plastik gerinimleri analiz etmek için bir metal levha bükülmüştür. 2 boyutlu v-bükme şekillendirme programda modellenmiştir. Model bir kalıp, bir zımba ve bir sac levhadan oluşmaktadır. Programda katı mekanik fiziği arayüzü kullanılmıştır. Analiz; farklı pekleşme üsteli ve sac kalınlıkları için sürtünmeli ve sürtünmesiz ortam koşullarında yürütülmüştür. Sac uzunlukları ve genişlikleri 60 mm'dir. Sac kalınlıkları 1,0 ila 3,0 mm arasında değişmektedir. Pekleşme üsteli 0,1'den 0,5'e kadar değiştirilmiştir. Sac kalınlığı ve pekleşme üsteli azaldıkça zımba kuvvetinin arttığı hesaplanmıştır. Elde edilen maksimum zımba kuvveti, pekleşme üsteli 0.3 olduğunda 1,0 mm, 2,0 mm ve 3,0 mm kalınlık için sırasıyla 1.12x105 N, 3.75x105 N and 4.05x105 N değerlerindedir. Ayrıca sürtünmeli durumda 1 mm kalınlık için pekleşme üsteli 0,1'den 0,5'e arttıkça maksimum zımba kuvveti 1.49x105 N to 8.08x104 N'ye düşer. Dahası, pekleşme üsteli 0.1 iken maksimum zımba kuvveti sürtünmesiz durumda 1 mm kalınlığındaki sac için 9.13x104 N değerine ulaşmıştır. Maksimum Von Misses gerilmesinin sacın ucunda hesaplandığı sonucuna varılmıştır.

Anahtar Kelimeler

Sayısal, Sac metal, Zımba, Kalınlık, V-bükme, Pekleşme üsteli

Kaynakça

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