Operation process of pipe bending machine (2)

Bending radius

The bending radius of the tube determines the resistance of the tube in bending. Generally speaking, the pipe diameter is large, the bending radius is small, and the bending quality is difficult to guarantee. Therefore, the R value of the bending die is generally 23 times of the pipe diameter.

Bending forming speed

The main influence of bending forming speed on the forming quality is: too fast, it is easy to cause the flattening of the bending part of the pipe, and the roundness can not meet the requirements, which will lead to the cracking and breaking of the pipe; if the speed is too slow, it is easy to cause the wrinkling of the pipe and the slipping of the pressing block, and the pipe with large diameter is easy to form the depression of the bending part of the pipe. According to a large number of tests on the two CNC pipe benders, it is appropriate to determine the bending speed of the pipe as 20% - 40% of the maximum bending speed of the machine.

Mandrel and its position

In the bending process, the mandrel mainly plays the role of supporting the inner wall of the tube bending radius to prevent its deformation. If the mandrel is not used, the quality of domestic tube is difficult to be guaranteed. There are many kinds of mandrel, such as column mandrel, universal single, double, three, four ball head mandrel, directional single and multi ball head mandrel. In addition, the position of mandrel also has certain influence on the tube bending forming: theoretically, its tangent line should be flush with the tangent line of the bending die, but after a large number of tests, it is better to advance 1-2mm, and the bending quality is ideal. Of course, too much advance will cause the so-called "goose head" phenomenon on the outer wall of the curved part.

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