There are various tube bending machines, including rotary draw, roll, and vector tube bending machines. A rotary draw bending machine works by clamping the tube on the machine, and then the bend die begins to rotate. This pressure ensures the tube follows the bend die's direction. When it comes to a roll metal bender, the position of the two lower rollers is fixed, but it is possible to adjust the height of the upper roller. The tube bends by moving between the rollers until the desired shape is attained. Lastly, the vector metal bender works similarly to the rotary draw machine.
The major parts of a rotary metal bender include clamp, bend, pressure, and wipe dies, including the mandrel. A bend die is the most crucial component of the machine. The tube is clamped to the bend die, and the drawing process creates a bend. This die also determines the tube's internal radius. A clamp die is a part that clamps the tube to the bend die. Its primary function is to stop the tube from slipping. The pressure die ensures that the tube follows the bend die's curve. On the other hand, a wiper die prevents humps from forming inside the radius of the tube. This is because bending causes the tube to wrinkle, but the wiper helps in smoothening the surface. Finally, the mandrel helps in preventing the tube from collapsing.
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