Thin-walled steel pipe bending die design (3)

In order to apply a reverse pre-pressure to the curved steel pipe during the working process to offset the elliptical deformation caused by the bending of the steel pipe, the arc groove surface of the rolling pressure roller is designed to have a double arc curve, and its shape is as shown in FIG. Show. The relevant dimensions are calculated as follows:

The material of the rolling pressure roller is generally 45 steel, and the surface quenching hardness of the anti-deformation groove is 40-45HRC. In order to make the rolling pressure roller have a certain pulling effect on the side wall of the curved pipe, and no large frictional resistance is generated, The surface roughness value is generally preferably R _a ≤ 3.2 μm.

3. Guide wheel

r=d/2, the material and the heat treatment are the same as the rolling pin.

As shown in Fig. 5, in order to reduce the frictional resistance, the center of the arc groove is 1 to 1.5 mm away from the outer surface of the guide wheel, and the radius of the arc is r = d/2. The material and the heat treatment are the same as the rolling roller.

4. Rolling pressure roller and guide wheel relative position

The leading angle of the guide wheel to the steel pipe is also an important parameter. In order to make the position of the rolling pinch just the bending part of the bending plastic deformation of the steel pipe, α should be equal to the rebound angle of the bent steel pipe. The distance δ between the center line of the rolling pinch and the center line of the elbow module can be 5 to 15 mm.

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