3/10/2021 0 Comments Aluminum Bend Allowance Table
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.As this happens you gain a small amount of total length in your part.
Likewise when you are trying to develop a flat pattern you will have to make a deduction from your desired part size to get the correct flat size. ![]() The leg lengths are the part of the flange which is outside of the bend radius. In our example below a part with flange lengths of 2 and 3 with an inside radius of.250 at 90 will have leg lengths of 1.625 and 2.625 respectively. ![]() In order to develop the flat pattern we add.457 to 1.625 and 2.625 to arrive at 4.707. As you can see the Bend Allowance and Bend Deduction are closely related below. It simply processes these variables through the equations we will discuss below. Note that the Bend Angle is the excluded angle, not the included angle. You will need to know your Material Thickness (MT), the Bend Angle (B Gauge Chart page. The Bend Angle will be something that you determine based on what the complimentary angle of your part is going to be. It is important to convert from the included angle to the complimentary angle before performing any calculations. The Inside Radius will be the finished radius of the included angle. For information on how the Inside Radius is determined see our post on the Air Bend Force Chart. Finally the K-Factor is a property of the material which you are bending. This property determines how the material is stretched when bending. See our post on the K-Factor for better understanding as well as charts and formulas. Once you understand what these values represent you can use them to accurately and quickly develop flat patterns for your sheet metal parts. Creating a chart with your standard values is a key component of speeding up this process. Aluminum Bend Allowance Table Software Packages LikeMany software packages like Solid Works, Inventor and Solid Edge will let you incorporate a Bend Allowance Chart into its calculations when developing flat patterns. Protective coatings, variations in the alloy and thickness as well as many other small factors all add up to give you Bend Allowances unique to your operation. Aluminum Bend Allowance Table Download The ExcelThis chart will get you close enough for most applications and may not require fine tuning on your part, however if you are truly dedicated to precise bending, download the excel sheet and begin plugging in your own values. You can easily modify the Material Thickness, Inside Radius and K-Factor for each thickness at the top of each column.
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