What is the main role of the mandrel in the bending process of the automatic pipe bender?

1. The size of the bending radius of the material determines the resistance of the material when it is bent. Generally speaking, when the pipe diameter is large and the bending radius is small, internal wrinkles and slippage are prone to occur during bending, and the bending quality is difficult to guarantee. Above, the white rust steel pipe should be more than 2-3 times as well.

2. The main influence of the bending and forming speed of the CNC hydraulic pipe bender on the forming quality of the product is: the speed is too fast, it is easy to cause the flattening of the bending part of the conduit, and the roundness cannot meet the requirements, resulting in the cracking and breaking of the steel pipe; the speed is too slow , It is easy to cause the wrinkling of the material and the slippage of the pressing block, and the large diameter pipe is easy to form the insufficient fullness of the curved part of the steel pipe, thus affecting the quality of the product. For a large number of tests on the CNC hydraulic pipe bending machine, it is appropriate to set the bending speed of the material to 20%-40% of the bending speed of the equipment.

3. The mandrel mainly plays the role of supporting the inner wall of the bending radius of the catheter to prevent its deformation during the bending process. At present, the quality of domestic pipes is difficult to guarantee if the mandrel is not used for bending and forming on the equipment. There are many forms of CNC hydraulic pipe bending mandrels, such as straight mandrels, universal single, double, three and four ball mandrels, directional single and multi-ball mandrels, etc. In addition, the position of the pipe bending mandrel also has a certain influence on the bending and forming of the steel pipe: in theory, the straight end of the mandrel should be aligned with the center tangent of the pipe bending die. It is better to advance or retreat 1-2mm of the pipe core rod, and the quality of the pipe bend is ideal at this time.

4. Of course, if the advance is too large, it will also cause the so-called "goose head" phenomenon on the outer wall of the curved part.