Pipe bending machine is a widely used machine, ranging from a small component of a 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 a pipe bending machine is to apply a bending moment through a reasonable fulcrum and force point, causing plastic deformation of the steel pipe and achieving the purpose of cold bending of the steel pipe. The lower mold is located at the front of the pipe bending machine and is suspended on the frame in a floating state by a hydraulic cylinder. The steel pipe is introduced into the lower mold from the rear of the pipe bending machine through a fixture and an upper mold using a lifting device. The inner tube is installed into the steel pipe and placed in the center of the upper mold. The inner tube expansion block supports and coils the inner wall of the steel pipe, thereby avoiding abnormal deformation of the steel pipe during the bending process.

In the development of pipe bending machines, the power source of pipe bending machines has been continuously improved and enhanced. In the early days of manual bending of pipe materials, the main power source was the labor of a single or multiple operators, and the processed products were generally small pipe fittings. This processing method had low production efficiency, insufficient accuracy, and limited pipe shapes. With the development of modern technology and the improvement of industrial level, high-performance pipe bending machines such as CNC numerical control pipe bending machines and three-dimensional hydraulic pipe bending machines have been developed and researched. These high-level pipe bending machines generally have three main driving modes: motor drive, hydraulic drive, and motor hydraulic hybrid drive.

1. Motor driven

In today's modern industry, most mechanisms and devices are powered by electric motors to provide the basic movement of the entire device. Powered by an electric motor, there are many ways to transmit power, such as using an electric motor to drive mechanisms such as gears, racks, camshafts, connecting rods, etc., and designing a pipe bending machine 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 developing technologies in mechanical equipment, especially in recent years, it has entered a new stage of development. Hydraulic transmission and control systems are widely used in various industries due to their advantages of high transmission power, high control accuracy, fast response speed, and easy implementation of motor hydraulic integrated control. 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-purpose use.

3. Electric motor hydraulic hybrid drive

Although hydraulic bend pipes have the advantages of high power transmission, high control accuracy, and fast response speed, they also have some shortcomings, such as low production efficiency due to too many operator actions; The machine experiences significant wear and tear, resulting in a shortened lifespan; More operators are required, labor costs are high, and product costs are high. Therefore, in further research, it is proposed to use a hybrid drive of motor and hydraulic, which can adopt the most reasonable driving method in the advantages of motor and hydraulic to reduce production costs, improve production efficiency, and enhance machining accuracy.