What is the relationship about bending radius and thickness of CNC bending machine?

The bending radius of the sheet metal of the CNC bending machine is a value required in the sheet metal drawing. It is difficult to determine how large this value is in actual processing. In fact, the bending radius of the sheet metal is related to the thickness of the material, the pressure of the bending machine, and the width of the lower die groove of the bending die. What’s the specific relationship, let’s study:

What is the relationship between the bending radius of the sheet metal of the CNC bending machine and the thickness of the plate? How are the three bending angles in the bending machine calculated?

CNC bending machine

According to the actual sheet metal processing experience: when the general plate thickness is not greater than 6mm, when bending, the inner radius of the sheet metal bending can be directly used as the radius of the plate thickness.

When the plate thickness is greater than 6mm and less than 12mm, the bending radius in the plate is generally 1.25 to 1.5 times the plate thickness. When the plate thickness is not less than 12mm, the bending radius in the plate is generally 2 to 3 times the plate thickness.

When the bending radius is R=0.5, the general sheet metal thickness T is equal to 0.5mm. If a radius size larger or smaller than the plate thickness is required, special mold processing is required.

When the sheet metal drawing requires the sheet to be bent at 90°, and the bending radius is particularly small, the sheet should be grooved first, and then the sheet metal should be bent. It can also process the upper and lower molds of special bending machine molds.

The bending radius of the sheet metal has a certain relationship with the width of the lower die groove of the bending die.

Through a large number of experiments in sheet metal processing, it is found that the width of the lower die groove of the bending die has a certain relationship with the bending radius. For example: 1.0mm plate is bent with a groove width of 8mm, so that the bending radius that is pressed out is R1 in an ideal state.

If the 20 mm groove width is used for bending, since the upper die moves downward during bending, the depth of the stretched sheet reaches a certain angle. Then we know that the area of ​​a 20 mm wide groove is larger than that of an 8 mm wide groove. When bending with a 20 mm wide groove, the stretched area will also increase and the R angle will also increase.

Therefore, we try to use narrow grooves to bend as much as possible under the condition that the bending radius of the sheet is required, and the mold of the bending machine is not damaged. Under normal circumstances, it is recommended to operate according to the ratio of standard plate thickness to groove width of 1:8. The minimum should not be less than the ratio of plate thickness to groove width of 1:6, and the sheet metal bending can be appropriately smaller, and it can not be less than the ratio of plate thickness to groove width of 1:4. Recommendation: When the strength permits, the method of first grooving and bending is preferred to make a small sheet metal bending radius.

The bending radius of sheet metal processing is related to the thickness of the material and the width of the bending notch. The simple and convenient, relatively rough method is:

Generally, when the plate thickness is not greater than 6mm, the bending radius of the plate can be directly used as the radius during bending. When the plate thickness is greater than 6mm and less than 12mm, the bending radius of the plate is generally 1.25 to 1.5 times of the plate thickness. When the thickness is not less than 12mm, the bending radius in the plate is generally 2 to 3 times the plate thickness.

code explanation: V-bending notch width, R-bending radius, B-minimum bending height, S-sheet thickness

The above description is the pressure parameters and the width of the bending notch of a certain bending machine. The actual application is calculated and used according to the pressure of the bending machine and the bending notch of your own sheet metal processing plant.

Explain in detail how to calculate the 3 kinds of bending angles!

1. Small V folds large angle, large V pressurization

Use this method when the shape of the internal bending workpiece is limited

2. Bending with gasket:

For small quantity and high processing shape requirements

A. It is better to choose the thickness of the gasket to be the thickness of the processed plate.

B. When V groove is selected, calculate with two plate thicknesses

3. When the round hole is bent and pulled, the hole can be processed before bending after bending.

4. When the square hole is bent and pulled, the simple die can be used for secondary processing.

5. Package material bending:

is divided into outer material bending and inner material bending, (as shown in the figure below)

The bend of the package material should be opened at the corner of the work pad so that there is no deformation of the material after processing.

Inner packing material bending = => bend first, A, B then bend C

Outer material bending = => first bending C, then bending A, B

CNC bending machine, bending machine manufacturer, CNC shearing machine