![]() ![]() The purpose of this article is to demonstrate to engineers and designers the technical aspects of how we (and you!) can determine the K-factor in sheet metal design. Knowing your fabricator’s process and press brake tooling available (notably the radius of the male break dies), goes a long way to save time and potential surprises. ![]() It is for this reason that reputable metal fabricators may revise the model, and add their particular press brake bending parameters to create an updated flat development that will yield the part you require, and within your required tolerances. What does this mean to the part designer? Even if your part is designed as a sheet metal part in a CAD Solids Modeler, when flattened, the flat development may or may not be correct, depending on the above-noted variables. This compensation can be calculated using something called the K-factor, which considers variables such as the type of material, its thickness, the inside radius of the bend, and how it is bent. The result is that the workpiece actually “grows” in overall size if not compensated for. The reason for this is that when metal is bent, the material on the inside of the bend compresses, while the material on the outside stretches, and not by equal amounts (for reasons that get too technical even for this article). Interactive part has learner calculate bend allowance and blank size. Introduces two methods of determining bend allowance one is simple and is an approximate, the other is more precise. ![]() One of the phenomena sheet metal fabricators must contend when bending parts is something called bending allowance. Calculating Bend Allowance for Press Brake Forming By Dave Hoffman. ![]()
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