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Selection of Bending Method in Sheet Metal Bends and Sheet Metal Unfolding

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I want to design and manufacture a bent sheet metal part in the most accurate way possible. Once the design of the part is finished, I flatten the sheet, get a DXF file, and cut it with laser or punch. My goal is to find the correct sheet metal unfolding. When modeling bends in sheet metal, there are three different methods: “Bend Allowance”, “Bend Deduction”, and “K Factor”. How can I determine which of these methods I should design with, or do all three methods actually give the same result? Another issue is that when calculating the K factor, it also asks for the measurement of the sheet unfolding, but if the value I want to find is the sheet unfolding, how can I know this and write it in the formula? We have different dies and blades in our press brake machines used in manufacturing. Do I need to calculate separately for each die and blade? Or should I decide at the design stage that this part will be bent with this die and this blade, and create the bends in the design files according to the calculation we made earlier? In short, what steps should be followed to design and manufacture a bent sheet metal part?
(We generally use 2-3 mm sheets in manufacturing, and our blades have a radius of 0.8, press brake machines)

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    • E
      I want to design and manufacture a bent sheet metal part in the most accurate way possible. Once the design of the part is finished, I flatten the sheet, get a DXF file, and cut it with laser or punch. My goal is to find the correct sheet metal unfolding. When modeling bends in sheet metal, there are three different methods: “Bend Allowance”, “Bend Deduction”, and “K Factor”. How can I determine which of these methods I should design with, or do all three methods actually give the same result? Another issue is that when calculating the K factor, it also asks for the measurement of the sheet unfolding, but if the value I want to find is the sheet unfolding, how can I know this and write it in the formula? We have different dies and blades in our press brake machines used in manufacturing. Do I need to calculate separately for each die and blade? Or should I decide at the design stage that this part will be bent with this die and this blade, and create the bends in the design files according to the calculation we made earlier? In short, what steps should be followed to design and manufacture a bent sheet metal part?
      (We generally use 2-3 mm sheets in manufacturing, and our blades have a radius of 0.8, press brake machines)
      Automatically translated from: Türkçe

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    • Admin
      Enver Bey merhaba, detaylı sorunuz için teşekkürler. Aşağıda kısaca özetlemeye çalıştım:

      1. Büküm İzni, Büküm Kesintisi ve K-Faktörü

      Üç yöntem de aynı fiziksel gerçeği farklı açılardan tanımlar. Doğru kullanıldığında üçü de aynı düz açınım uzunluğunu verir.

      K-Faktörü, CAD ortamında malzeme tanımlamasıyla çalışırken, büküm izni manuel hesap veya formül tabanlı DXF üretiminde kullanılır. Büküm kesintisi ise düz kol boyutlarından geriye dönük hesaplamada.

      2. K-Faktörü Tabloya Bakılarak Seçilir, Açınımdan Hesaplanmaz

      K-faktörü sac açınımını hesaplamak için kullandığınız girdidir, açınımın kendisi değildir. Malzeme tipine ve büküm yöntemine göre doğrudan tablodan seçilir:

      0,8 mm iç yarıçap ve 2 mm çelik için tablo karşılığı: Air Bending, “0 → et kalınlığı”, sert malzeme → K = 0,40

      Büküm İzni (bend allowance) formülü:

      BA = (π / 180) × β × (Ri + K × t)

      Düz açınım:

      L_düz = L₁ + L₂ + BA

      Örnek (90°, 2 mm çelik, Ri = 0,8 mm, K = 0,40): BA = 1,5708 × (0,8 + 0,40 × 2,0) = 2,51 mm

      3. Farklı Yatak ve Bıçaklar

      Air bending
      İç yarıçap bıçaktan değil, V-yatak ağız genişliğinden gelir (Ri ≈ 0,16 × V). Aynı yatak kullanıldığında bıçak profili sonucu değiştirmez. Yatak değişirse BA yeniden hesaplanır.
      Bottoming / Coining
      İç yarıçap doğrudan bıçak profilinden gelir. Her farklı bıçak için ayrı hesap zorunludur.
      Tasarım aşamasında kullanılacak iç yarıçapı teknik resme not olarak ekleyin. Bu, atölye ile tasarım arasındaki en yaygın açınım uyuşmazlığı nedenidir.

      Ayrıca, Onshape veya SolidWorks Sheet Metal ortamında doğru malzeme ve K-faktörünü girerek modeli düzleştirip DXF alabilirsiniz. CAD ortamında girdiğiniz K-faktörünün gerçek imalat koşullarınızı yansıtması gerekir. Varsayılan değerlerle bırakılan bir model yanlış açınım üretir

      Automatically translated from: Türkçe

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Selection of Bending Method in Sheet Metal Bends and Sheet Metal Unfolding
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