1. Sheet metal bending drawings can be from first perspective or third perspective. When you look at the drawing, you must first distinguish whether it is the first perspective or the third perspective. There is no third angle symbol in the title bar of the national standard. The national standard states that drawings and readings should be based on the first angle method. When encountering foreign designs, you must clearly read the corner symbols of the cartouche. The image below is the first trigonometric view symbol.
Our country’s drawing standard is perspective first When you view the drawing, you can clearly understand the drawing as long as you follow the projection rules. If it is a sheet metal processing drawing viewed from a third point of view, you must indicate which side it is on the drawing and place it on that side to view it. For example, the image seen from the left is placed on the left, which is exactly the opposite of the image seen from the first perspective.
Looking at the title bar, another thing to note is the material and thickness of the plate. When bending, the bending die should be adjusted according to the plate thickness information. This cannot be forgotten. Before bending, be sure to confirm whether the drawing is consistent with the workpiece to be folded.
2. Place the folded workpiece according to the front view, paying attention to the drawing direction or burrs, so as to facilitate the identification of the direction and easily check whether the drawing is correct.
3. When looking at the drawings, look at the whole and don’t ignore the parts. For some products, due to structural reasons, the parts that need to be folded cannot be displayed on the normal three-dimensional view, so a partial view is necessary.
4. It is necessary to see clearly whether the bending edge line in the sheet metal processing drawing is a solid line or a dotted line. The solid line represents the upward bending and the dashed line represents the thickness of the plate, i.e. the side that cannot be seen, so it is folded downwards.
Because many sheet metal machining drawings are now produced by some 3D software.
Therefore, the folded edge line sometimes has a tangent line that overlaps the dotted line. It is difficult for us to know whether we should lean up or down. At this point we need to use the side view to see the bending direction.
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