Precauções essenciais para processamento seguro de dobra de arco

Essential Precautions for Safe Arc Bending Processing

Sheet metal arc bending processing: arc processing can be divided into common tool processing or arc tool processing (radius punch and rounding punch).

1. Standard Punch Bending Arc

The arc bending process involves the following steps:

1. Select a 0.2R common punch and a die that meets the die selection standard.

2. Calculate the arc length.

3. Determine the number of bends needed to complete the arc by dividing the length of the arc by the thickness of the material.

4. Calculate the bending angle for each bend by dividing the arc angle by the number of bends.

5. Perform the bending process.

However, because the arc bending process is completed by bending several or even dozens of times, the size range of the bending arc is limited by the tools.

General scope of processing:

1) 90 degree circular arc: forming a circular arc greater than R12;

2) Circular arc above 120 degrees: can process all circular arcs R greater than the tool limit.

2. Arc bending with radius punch

The choice of tool depends on the processing method.

For example, the width of the V-groove is determined by the depth of the bend.

Related Reading: Press Brake Bending Depth Calculator

The R angle of the circular arc is formed based on the inherent R angle of the tool.

When selecting the die, if the bending radius is less than R12, an upper and lower die with processing specifications can be selected for a single bend.

Since the R punch is a standard die, its R specification is limited, and therefore the specification size of the processed arc is also limited.

If the desired bend radius is not within the standard mold specification, it can be increased by adding material around the mold R.

If the bend radius is greater than R12, it needs to be formed through multiple bends, with the same processing conditions as for standard punched arc bending.

Radius punch arc bending has the advantage of producing a smooth and attractive bend, making it suitable for products with strict appearance requirements.

3. Processing Precautions

1) When bending a bow with a radius punch, it is important to first choose the mold based on the mold selection pattern. However, when processing a 90-degree arc, sheet metal parts may bounce and prevent the 90-degree arc from meeting the requirements. In this case, manual intervention is required to ensure the proper angle. To avoid this problem, a lower die of 88 degrees should be preferred when processing a 90 degree circular arc.

2）During arc processing, it is necessary to use a detection device to ensure the size of the processed appearance.

3）The process angle arc is normally processed using an interchangeable die or by manual means.

4) To determine the V-groove width pattern of the bottom die, use an R die (round bar and arc punch) to bend the arc.

  • The width of the V-groove of the bottom die selected to bend the 90 degree arc is: V>2 (R+T);
  • The width of the V-groove of the bottom die selected to bend the 135 degree arc is: V>1.5 (R+T).

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