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Sheet metal bending and forming

bending machine

1.After bending the sheet metal , the metal material will protrude on both sides of the corner due to the extrusion, resulting in a larger width than the original size.

The protrusion size is related to the thickness of the material used. The thicker the material, the larger the protrusion point. In order to avoid this phenomenon, you can make a semicircle on both sides of the bending line beforehand.

The diameter of the semicircle is preferably more than 1.5 times the thickness of the material. When design to fold the edge material , the same method can be used.

2.When bending the sheet metal , the inner R angle is preferably greater than or equal to 1/2 of the material thickness.

If not use the R angle , the right angle will gradually disappear after multiple stampings, and the R angle will naturally form. The length of one or both sides of the R angle will be slightly longer.

3.After bending the sheet metal , it is easy to deform under force. In order to avoid the occurrence of deformation, can add an appropriate amount of reinforcement at a 45-degree angle at the bending position, and the strength of other parts not interfe as the principle.

4.General sheet metal parts are not easy to maintain their straightness when they are long and narrow, and they are more likely to deform after stressing.

Therefore, we can fold an L shape or fold two sides into a ㄇ shape to maintain its strength and straightness, but often What should I do when the L and ㄇ shapes cannot connect from beginning to end, and need interrupt due to some factors?

At this time, we can hit the right amount of ribs to increase its strength

5.The transition between the plane and the bending surface is best to have narrow holes or open-edge holes after bending, otherwise there will be burrs, and the width of the narrow holes is preferably greater than or equal to 1.5 times the thickness of the meat, and there are drawings .

Don’t forget to mark the R angle. The male and female molds of right and acute angles are easy to crack. Once stopping the line, the mold will be lost.

6.At the corner of the metal sheet, if it not require to be a 90 degree angle, be sure to treat it as an appropriate R angle, because the right angle at the edge of the metal sheet is likely to cause sharp points and cause cuts.

In the case of the female mold, the right-angled tip is easy to crack due to stress concentration, and the male mold is easy to crack at the tip, which makes the mold must be repaired and delays mass production.

Even if it does not crack for a long time, it will wear and form an R angle, which will cause the product to produce burrs. Cause defective products.

7.(1). Folding edges can divide into unilateral discounting and bilateral discounting.

If require precision , it is best to use bilateral discounting. This will have better accuracy.

The height of the folded edge should preferably be greater than 3mm (t: 1.0). -1.2mm) otherwise the size will be unstable due to too small clamping size

7(2). When folding the edge, the parts on the side wall or internal protrusions should not be too close to the bottom surface, preferably above 10mm.

Otherwise the corners under the protrusions will not be stamped by the male die, and the R angle will be more than The R angles on the left and right sides are not continuous, which will affect the appearance.

We can punch out an appropriate indentation on the discount before bending, which can improve the appearance

7 (3). When folding the edge, the opening on the side wall should not be close to the bottom surface, and it must be kept above 3mm, otherwise the opening will be deformed due to the bending.

Before bending, we can punch out a long hole with the same length as the opening and a width of 1.5 material thickness on the fold line.

What effect does this have? It can cut off the involvement without affecting the appearance of the opening.

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