In enterprises, if the required bend diameter is large and the batch is large, the operation is generally carried out on fixed large-scale bend equipment. This kind of equipment is generally not easy to move. For those occasions where the diameter of the metal pipe is small and the batch size is small, the operator often makes a simple mold and bends it manually, but the efficiency is not high. What principles must be followed in designing a high-quality pipe bending machine: in mechanical engineering and daily life, it is often necessary to bend some pipe fittings.

Heating is often used to improve the plasticity of metal pipes, or sand is filled into the pipes to maintain their shape. These methods are time-consuming, laborious and inefficient, and the quality is difficult to guarantee. This paper introduces a new type of pipe bending equipment - pipe bender. In engineering practice, it is often necessary to make elbows on site. It is required to keep the circular section unchanged and the pipe wall thickness uniform. For example, some railings commonly used in urban construction, pipes for decorative purposes, fluid transmission, and so on.