The orientation of the mandrel in the pipe bender and the effect of the mandrel

During the bending process, the mandrel mainly plays the effect of supporting the inner wall of the bending radius of the catheter to avoid its deformation. If the domestic pipe is bent and formed on the machine tool without the use of a mandrel, its quality is difficult to guarantee. 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 after a lot of experiments, it is better to be 1-2 mm earlier. Machine quality is more ambitious. Of course, if the amount of advance is too large, the so-called "goose head" phenomenon will appear on the outer wall of the tortuous part.