Large Radius Sheet Metal Bending

The multi breakage phenomenon occurs in some large radius air bending operations more commonly in thicker sheet metal and less commonly in materials with higher tensile strengths.

Large radius sheet metal bending.

Larger bend radii require about the same force for bottoming as they do for air bending however smaller radii require greater force up to five times as much than air bending. While rolling the bend in a slip roller always is an option if you have one rolling is not the most accurate way to place a large radius in a precision part. Step bending or bump bending is a method for forming a large bend radius in a sheet metal part without the need for special tooling by creating a series of highly open bends in close proximity. Step bending is a procedure in which multiple hits bends are made along the entire length of the inside radius to produce the bend.

The final quality depends on the number of bends and the step between them. The best option may be to use a step bending process. Therefore the radius of the sheet metal needs reasonable value. This means that the phenomena is less likely to occur in a thinner sheet of stainless steel and will be more pronounced in a thicker sheet of cold rolled steel.

It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. Also called bump bending this method uses many v bends in succession to get a large radius for your workpiece. Use this document to choose values that are both manufacturable and meet your needs. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube.

Analysis of bending sheet metal parts with large radius the basic principle of the multi step forming process is to roughly divide the arc segment into polyline segments as shown in figure 1 so as to achieve the purpose of bending sheet metal with large radius with small radius punch. Bend radii minimum bend sizes. Of course the sheet metal bending radius is not the bigger the better. Advantages of bottoming include greater accuracy and less springback.

This method will have advantages over using a roller because the length of the rolled section can be controlled more precisely with high repeatability.