Sheet metal bending is a common process in manufacturing that involves forming sheet metal into different shapes. While this is a simple process, there are some challenges that must be overcome to achieve the desired results. One of the most important issues is flex marks. These marks appear when the sheet metal is bent, creating visible marks on the surface. In this article, we'll explore ways to avoid bend marks during sheet metal bending for a nice finish.  First, it is important to understand what sheet metal bend marks are and why they can be a problem. Sheet metal bend marks are visible marks that appear on the surface of a sheet metal after it has been bent. They are caused by tool marks, which are imprints left on the surface of the sheet metal by the tooling used during the bending process. These indentations are often visible on the surface of the sheet metal and are difficult to remove, resulting in an unsightly surface finish. To avoid bend marks, the sheet metal should be covered with cloth or plastic during the bending process. This will prevent machining marks from imprinting on the sheet, resulting in a smoother surface finish. By using cloth or plastic, you also reduce the chances of the sheet metal getting scratched or damaged during bending.  Another way to avoid bend marks is to ensure that the tools used in the bending process are of high quality. Poor quality tools can cause deep and visible tool marks on the surface of the sheet metal. High-quality tools, on the other hand, produce lighter marks that are easier to remove or not visible at all.  Finally, to avoid bend marks, the sheet metal should be properly secured during bending. Properly securing the sheet metal helps prevent it from shifting or shifting during bending, which could cause machining marks. To ensure that the sheet metal is properly secured, clamps and other securing devices should be used to hold the sheet firmly in place during the bending process.  In summary, sheet metal bending is a critical process in manufacturing and is critical to achieving the desired surface finish. Bend marks can be a serious problem and can be avoided by covering the sheet metal with cloth or plastic during bending, using high quality tools, and properly securing the sheet metal during bending. By following these tips, you can avoid bend marks and achieve a nice finish free of machining marks.  But I have to clarify that even use all method mentioned, we can make the outside free from marks. To make sure the precision tolerance of sheet metal parts, we can’t use cloth on the upper tool, then the inside marks will still be visible.