The pipe bending machine is a machine with a very common application range. The pipe bending machine is a machine with a very common application range, ranging from a small part of the refrigerator to the bending of open pipes. With the advancement of technology in various industries, new requirements have been put forward for the accuracy and composite processing technology of pipe bending machines. The working principle of the tube bending machine is to apply bending moments through a fair fulcrum and force point to plastically deform the steel pipe, so as to achieve the purpose of cold bending of the steel pipe. The rack is in a floating state, and the steel pipe is introduced into the lower mold from the rear of the pipe bender through the clamp and the upper mold by using a spreader. The inner tube is loaded into the steel tube and placed in the center of the upper mold. So that the steel tube can avoid abnormal deformation during the bending process.

In the development of pipe bender, the power source of the pipe bending machine has been continuously improved and improved. In the early manual bending of pipe materials, the main power source was the labor of a single or multiple operators, and the processed products are generally It is a pipe with small pipe fittings. The production efficiency of this processing method is low, the accuracy is not enough, and the pipe type is limited. With the development of modern technology and the improvement of industrial level, some high-performance pipe bending machines such as CNC numerical control pipe bending machine, three-dimensional hydraulic pipe bending machine, etc. have been developed and studied. There are three types: motor drive, hydraulic drive, and motor-hydraulic hybrid drive.

1. Motor drive
Today in modern industry, most of the power sources of mechanisms and devices are driven by motors to provide power for the basic actions of the entire device. The motor provides the source power, and there are many ways in the power transmission process. For example, the motor can be used to drive the gears, racks, cams, connecting rods, and other mechanisms to design a bender that meets the requirements according to the situation.

2. Hydraulic drive

With the continuous development of industrial technology, hydraulic transmission technology is one of the fastest-growing technologies in mechanical equipment, especially in recent years, has entered a new stage of development. The hydraulic transmission and control system is widely used in various industries due to its advantages of large transmission power, control accuracy, fast response speed and easy implementation of integrated control of motor fluid. The hydraulic pipe bending machine powered by hydraulic pressure is a new type of pipe bending mechanism, which has the advantages of reasonable structure, convenient operation, safe use, fast loading and unloading, and multi-use of one machine.

3. Motor hydraulic hybrid drive

Although the hydraulic elbow has the advantages of large transmission power, high control accuracy and fast response speed, it also has some shortcomings, such as: due to too many actions of the operator, the production efficiency is low; the machine has large losses and the service life is reduced; It requires many operators, large labor costs, and high product costs. Therefore, in further research, it is proposed to use motor-hydraulic hybrid drive, so that the most reasonable driving method can be used at the respective advantages of the motor and hydraulic pressure to reduce production costs, improve production efficiency, and improve processing accuracy.