Cold bending method: suitable for small diameter pipes with diameters of Φ16-Φ25.
Use a special elbow spring to bend the pipe. Insert the spring into the other part of the pipe that needs to bend, hold both ends of the pipe (200-300mm from the bending center of the pipe) with both hands, hold it with your knees, and slowly bend the pipe with both hands. Taking into account the rebound of the pipe, the actual bending should be better than necessary The curvature is small by about 15°. After the pipe rebounds, check whether the curvature of the pipe meets the actual requirements. If it is combined, the spring can be drawn out. When the spring is not easy to take out, you can turn the spring counterclockwise on one side. When the spring is not easy to take out, you can turn the spring counterclockwise while pulling it out. When the pipe is long, you can tie a rope or thin iron wire to both ends of the spring. When you take out the spring after bending the pipe, you can pull the rope on both sides, pull it while slowly loosening it, and then take out the spring.
Use a prototype pipe bender to bend the pipe. Insert the pipe into the matching pipe bender, and the hand plate completes the required bend at one time.
Hot bending method: suitable for pipes with diameters of Φ32 and above.
First, the pipe needs to be bent out for heating. If there is a spring, you can insert the spring into the pipe. When the pipe becomes soft, you should fix the pipe on the wooden board and gradually complete the required bend. Bend it to the required degree, and then pull out the spring after the pipe is cooled and shaped. The pipe can be heated by a hot air blower, or immersed in a liquid at 100-140℃. Be careful not to bake the pipe on an open flame.
