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Views: 101 Author: Site Editor Publish Time: 2025-06-26 Origin: Site
When working with sheet metal, I often find myself exploring the relationship between sheet metal bending radius and sheet thickness. Understanding how these two factors interact is crucial for achieving precise bends and maintaining structural integrity. A proper bending radius can influence not only the aesthetics of the final product but also its performance under stress. In this article, I will delve into the key aspects of this relationship, providing insights that can help both beginners and experienced professionals navigate the complexities of sheet metal fabrication.
The sheet metal bending surface is a required value in the sheet metal drawing. It is difficult to determine how large it is in the actual processing of the value. This sheet metal bending workpiece is related to the thickness of the material, the pressure of the bending machine, and the width of the groove of the lower die of the bending die. What does it matter? Let’s study it today.
The experience in actual sheet metal processing shows that when the general plate thickness is not greater than 6mm, the inner radius of the sheet metal bend can be directly used as the radius when bending.
When the plate thickness is greater than 6mm and less than 12mm, the bending radius in the plate is generally 1.25 to 1.5 times the plate thickness. When the plate thickness is not less than 12mm, the bending radius in the plate is generally 2 to 3 times the plate thickness.
When the bending radius is R = 0.5, the general sheet metal thickness T is equal to 0.5mm. If you need a radius larger or smaller than the plate thickness, you need to use a special mold.
When the sheet metal drawing requires the sheet to be bent by 90 °, but when the bending radius is particularly small, the sheet should be processed with a planing groove before the sheet metal is bent. It can also process the upper and lower dies of special bending machine dies.
The bending surface of the sheet metal has a certain relationship with the width of the lower groove of the bending die.
Through a large number of experiments in sheet metal processing, it is found that there is a certain relationship between the groove width under the bending die and the bending radius. For example, a 1.0mm sheet is bent with an 8mm slot width, so the bending radius pressed out is ideally R1.
If a 20 mm slot width is used for bending, since the upper die moves downwards during bending, the depth of the stretched sheet reaches a certain angle. Then we know that the groove area of 20 mm width is larger than the groove area of 8 mm width. When bending with a 20 mm width groove, the stretched area also increases and the R angle also increases.
Therefore, when there is a requirement for the bending radius of the plate without damaging the bending machine mold, we try to bend with a narrow groove as much as possible. Under normal circumstances, it is recommended to operate according to the standard plate thickness and slot width ratio of 1: 8. The minimum must not be less than the ratio of the plate thickness to the slot width of 1: 6 to operate, the sheet metal bending can be appropriately smaller, not less than the ratio of the plate thickness to the slot width of 1: 4 to operate. Suggestion: When strength permits, it is preferred to use the planning method before bending to make a small sheet metal bending radius.
Understanding the interplay between bending radius and thickness is essential for successful sheet metal fabrication. Properly selecting these parameters helps ensure high-quality bends that meet design specifications without compromising material integrity.
