The principle of the technique: Firstly, the tube is fastened to the front clamp. Than the rear clamp (pressure die) connects to the tube. Tube is twisted by the rotation of the bending mold. The rear clamp (pressure die) follows to the pipe by applying pressure to it and saves the external shape of the pipe.

One of the most important part in the pipe bending process is the mandrel which is inside the tube during bending. Twisting technique is used to give the name emphasizes its importance.

Another complementary process is wiper die. It prevents the wrinkles in the inner radius those may occur during the bending. The wiper die is not necessary to each bending operation. However, it is necessary for many cases and also it is indispensable to the solution.