1. Proper bending radius value for hydraulic pipe bender

The size of the bending radius of the catheter determines the resistance of the catheter when it is bent. In general, the larger the diameter of the pipe, the smaller the bending radius, the internal wrinkling and slippage are likely to occur during bending, and the bending quality is difficult to ensure, so the R value of the pipe bending die is generally 23 times the pipe diameter.

2. Moderate bending forming rate of hydraulic pipe bender

The important influence of the bending forming rate on the forming quality is as follows: if the rate is too fast, the flatness of the curved part of the catheter is easily formed, and the roundness cannot meet the requirements, resulting in the cracking and breaking of the catheter; the rate is too slow, and the wrinkling and The compression block slips, and the large diameter pipe is easy to form the sag of the curved part of the catheter. For many experiments on these two hydraulic pipe benders, it is appropriate to determine the bending rate of the conduit to be 20%--40% of the maximum bending rate of the machine.

3. The mandrel and its orientation of the hydraulic pipe bender

During the bending process, the mandrel plays an important role in supporting the inner wall of the bending radius of the catheter to prevent its deformation. At present, the quality of domestic pipes is difficult to ensure if the mandrel is used for bending and forming on the machine tool. There are many types of mandrels, such as cylindrical mandrels, universal single, double, three and four ball head mandrels, directional single and multi-ball head mandrels, etc. In addition, the orientation of the mandrel also has a certain influence on the bending and forming of the catheter: in theory, its tangent should be flush with the tangent of the bending die, but many experiments have proved that it is better to be 1-2 mm in advance. Ambition. Of course, if the advance is too large, the so-called "goose head" will appear on the outer wall of the curved part.