Thus, adding a wiper die just after the bend die helps to smooth the surface. It may result in wrinkles with large deformations. The purpose is to avoid the formation of any humps on the inside radius.ĭuring the forming process, the material turns plastic during bending. Wiper DieĪ wiper die places just after the bend die. The pressure die makes sure the tube follows the bend die’s contour. Its main purpose is to prevent the pipe from slipping. The clamp die presses the tube onto the bend die. The selection of die is very important, as the tube’s inside radius depends on it. The tube clamps to the bend die and the drawing process produces the necessary bend. The bend die, also known as the bend form or the radius die, is the most important part of a rotary-draw bending machine.
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