In the process of sheet metal fabrication, bending is one of the processing steps where metal is bent using a bending lever on a bending machine. To ensure that the fabricated workpiece meets our requirements, we need to select the appropriate bending coefficient during sheet metal bending. So, how do we choose the bending coefficient in sheet metal fabrication? Below, Zhongyilong Hardware will introduce it to you:
Bending Coefficient:
The bending coefficient belongs to the field of sheet metal fabrication. For example, when bending a part with the dimensions A and B, such as an angle iron, it is first processed through a punch press to obtain the unfolded dimensions, which are calculated as A + B - bending coefficient = unfolded dimensions. The bending coefficient is a data-based calculation derived by experienced sheet metal bending masters through years of design experience and repeated verification. Later sheet metal bending masters can directly apply this calculation formula to obtain the unfolded flat dimensions of the bending structure.
Methods for Determining the Bending Coefficient in Sheet Metal Fabrication:
There is a simple calculation method for the bending coefficient, which is an empirical formula for a 90-degree bend: 1.7 times the material thickness.
In a 90-degree sheet metal bending process, subtract 1.7 times the material thickness from the right-angle bend. For example, if the material is a 1mm iron plate and the bending angle is 90 degrees, with bending dimensions of 100 and 50, the calculation is: 100 + 50 - 1.7 = 148.3mm. This is the calculated unfolded length. The value of 1.7 can be adjusted slightly to 1.6 or 1.65. Yes, it can be slightly adjusted. Since different metal factories use slightly different bending dies, the error is minimal and does not require adjustment, but adjustments can be made if necessary.
Here's a special angle where the bending coefficient can be calculated using a simple method. When the bending angle in sheet metal fabrication is 135 degrees, the bending coefficient can be reduced by 0.5 times the material thickness. For example, if the material is a 1mm iron plate and the bending angle is 135 degrees, with bending dimensions of 100 and 50, the calculation is: 100 + 50 * 0.5 = 149.5mm. The same method can be used for other sheet metal thicknesses. However, this method is only applicable to 135 degrees and cannot be used for other angles.
In sheet metal bending, there is also a special angle, which is used to calculate the flange (also known as the hem) using a simple method. The bending coefficient is equal to 0.4 times the thickness of the metal sheet. For example, if the material is a 1mm iron plate and the bending is a flange, with bending dimensions of 100 and 10, the calculation is: 100 + 10 - 0.4 = 109.6mm. This calculation is an empirical formula and is very accurate.
In summary, these are the methods for determining the bending coefficient in sheet metal fabrication. However, due to variations in equipment used, there may be some differences among sheet metal fabrication manufacturers in determining the bending coefficient. Therefore, it is important to analyze the actual situation and determine the appropriate bending coefficient for sheet metal fabrication.
