What is the Hydraulic Tube Bending Machine?

Hydraulic Tube Bending Machine is a new type of pipe bending tool with pipe bending function and jacking function. With reasonable structure, safe use, convenient operation, and reasonable price, Management, fast loading and unloading, multiple uses of one machine and many other advantages, in the domestic hydraulic pipe bending machine.


Structure and working principle

It consists of an electric oil pump, a high-pressure oil pipe, a quick joint, a working oil cylinder, a plunger, and an elbow part. High output by an electric oil pump

Pressurized oil is sent into the working oil cylinder through the high-pressure oil pipe, and the high-pressure oil pushes the plunger in the working oil cylinder to generate thrust, and the pipe is bent through the pipe bending part.


Electric hydraulic tube bending machine is suitable for installing pipes and repairing in factories, warehouses, docks, buildings, railways, automobiles, etc. In addition to its bend function, it can also be removed down-bend components (cylinders) are used as separate hydraulic jacks.

Pipe bending machine operation process

1.Tube regularization

Avoid excessively large arcs, arbitrary curves, compound bends, and arcs greater than 180 ° when designing and piping. Oversized arcs not only make the tooling cumbersome but also limited by the size of the pipe bending machine, the design of arbitrary curves and composite bends is very unreasonable, which greatly hinders mechanized and automated production, making it difficult for operators. The arc that is free from heavy physical labor greater than 180 ° makes the pipe bender unable to remove the mold.

2.Standardization of bending radius

The bending radius should be as close as possible to “one-tube-one-die” and “multi-tubes-one-die”. For the one tube bending, no matter how many bends and the bend angles there are, There can only be one bend radius, because the pipe bending can not replace the mold during the bending process, which is “one tube, one mold”. The “multi-tube and one die” uses the same bending radius for pipes of the same diameter. That is meaning use the same set of molds to bend different shapes of pipes, so as to help reduce the number of molds.

3. Bend radius

The bending radius of the guide tube determines the resistance of the guide tube during bending. Generally speaking, the pipe diameter is large and the bending radius is small. It is prone to internal wrinkles and slippage when bending, and the bending quality is difficult to ensure. Therefore, the R-value of the pipe bending die is generally 2-3 times the diameter of the pipe.

4. Bending forming speed

The main influence of the bending forming speed on the forming quality is: the speed is too fast, it is easy to cause the flat part of the curved part of the catheter, and the circularity can not meet the requirements, resulting in tearing and breaking. If the speed of the tube is too slow, which is likely to cause wrinkling of the guide tube and slipping of the compression block, and the pipe with a large diameter is liable to form the depression of the curved part of the catheter. In view of a large number of tests on these two CNC automatic pipe bending machines, it is appropriate to determine the bending degree of the guide tube as 20% -40% of the maximum bending degree of the machine.

5. Mandrel and its location

During the bending process, the mandrel mainly plays the role of supporting the inner wall of the bending radius of the guide tube to prevent its deformation. It is difficult to guarantee the quality of domestic pipe bending and forming on the machine tool without the use of a mandrel. There are many types of mandrels, such as cylindrical mandrels, universal single, double, triple and quadruple ball mandrels, directional single and multiple ball mandrels, etc. In addition, the position of the mandrel also has a certain effect on the bending of the guide tube: in theory, its tangent line should be flush with the tangent line of the pipe dies, but the test proves that it is better to advance 1 ~ 2mm. Of course, if the advance is too large, the “goose head” phenomenon will appear on the outer wall of the curved part.