ENGINEERING CONCEPTS

Bending allowances and types of sheet metal bendings

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The bending allowances are based on the thickness of sheet metals and material properties.

Material properties of sheet metal mainly two types they are.

  1. Mild steel
  2. Aluminum
 

Thickness of Sheet (mm)

Bending Allowances

Mild Steel

Aluminium

0.6 0.6 0.6
0.8 0.8 0.8
1.0 1.0 1.0
1.6 1.4 1.2
2.0 1.7 1.5
2.5 2.1 1.9
3.15 2.8 2.4
4 3.5 3.0
5 4.4 3.9
6 5.3 4.7
6.35 5.6 5.0

Types of sheet metal bendings.

  1. Flange
  2. Contour Flange
  3. Lofted Flange
  4. Bend
  5. Jog

Flange

Flange

Flange is a type of bend which has a different radius with angle and length.

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Types of bending properties.

  1. Full type width
  2. At center type width with dimension from end to end
  3. At end type width
  4. From end type
  5. From both ends type

Angles from 1 to 180 degrees.

Types of relief at bend and corner relief.

  • Square
  • Round
  • Bend only
  • Bend face
  • Bend face chain

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