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How to Understand Sheet Metal Bending Drawing?

Bending processing drawings are indispensable information in the sheet metal bending processing industry. 

The operators can only complete the bending work piece more effectively by operating in accordance with the bending drawings.

Sheet Metal Bending Process

1. How to Look Sheet Metal Bending Drawing Before Processing?

CBC Press Brake Sheet Metal Bending

After getting a bending drawing, first look at the title bar, which contains important information such as the perspective, material specifications, product models, material names, material coding, proportion, unit and other important information.

Before bend, be sure to confirm whether the drawings are consistent with the bending work piece.

When looking at the bending drawings, you must first distinguish whether it is the first perspective or the third perspective. Generally, it is divided into these two types. Generally, there are symbols in the frame.

2. Other points to note when looking at drawings

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Generally, the first perspective is the standard of drawing. You only need to look at the rules of the projection.

If the drawings from the third perspective, you need to look at which side marked on the drawing. For example, when you look at the images from the left, put it on the left, and the images that you have seen from the right are placed on the right.

Do not miss the local view or section of the face. The corners of the bending drawings must be seen.

The schematic diagram is not as good as the three views. Most of them are represented by lines or thick lines. Generally, you only need to distinguish down or fold it upwards.

Put the bending work piece according to the main view, pay attention to drawing or burrs, so as to facilitate the direction.

At the same time, it is easy to check whether the bending drawings are correct.

It depends on whether the sheet metal processing bending drawing is bent, whether it is solid or dotted.

The solid line refers to the part that can be seen, that is, bending up. The dotted line refers to the invisible part, that is, bending down.

Many sheet metal processing bending drawings are released from 3D software. Therefore, sometimes the bending line is cut into the dotted line. It makes us unable to see whether we need to bend upward or bend down. At this time we need to match the side view to see the bending direction.

When you look at the bending drawings, you can clearly understand the drawings according to the projection rules.

If it is the sheet metal processing drawing of the third perspective, you need to indicate which side is indicated on the drawing.

Looking at the bending drawings not only depends on the whole, but also cannot ignore local views or section.

Press Brake Sheet Metal Bending

Due to the product structure, it cannot be displayed in the three views, so local views need to be used. The corners of the drawing must also be paid attention to, which means that the entire bending drawing is the focus, and it must be paid enough attention. 

It is also necessary to pay attention to what materials and thickness. Press brake bottom die should be adjusted according to the thickness of the plate. This can be seen on the title bar. Remember to determine whether the bending drawings are consistent with the work piece.

The direction of the burrs is one of the correct means to test the bending drawings. For door panels and box body work pieces, the burrs need to be guaranteed in the opposite side.

When the folding shape is complicated, be sure to determine the best bending order.

If the order is wrong, it may cause the subsequent process to be unable to bend, even if it can be bent, it will affect quality and efficiency.

Some work pieces must not only consider the sequence of bending, but also the type of press brake tooling. 

Ensure important sizes. Generally, there are marks in the drawings.

If the materials are abnormal, contact the team leader or engineer in time.