# Section Bending Machine Working Principle

### WORKING PRINCIPLE

Angle Bending Machine uses the roll bending method. According to the number of work rolls, it can be divided into: Angle Bending Machine, Angle Bending Machine and Angle Bending Machine. The principle is shown in the figure.

Take the three-roll Angle Bending Machine as an example. The specific operation flow of this process is to place the profile between the rollers arranged in a zigzag manner, and the frictional force generated by the rotation of the roller drives the profile movement to bend the profile into a certain degree during the movement. shape.

In order to obtain a uniform plastic deformation and a bending radius for a curved deformed section, it is usually necessary for the roll to make multiple positive and negative directions of rotation. The different bending moments and the curvature of the bent profile are determined by the relative position between the roller and the roller.

Compared to three-roller Angle Bending Machine bending, the four-roll Angle Bending Machine is based on the same principle of bending, but one more roller can improve the precision of the bending of the profile, reduce the section deformation of the profile, and is more suitable for thin wall thickness. The bending deformation of the profile.

For the bending deformation of the section with complex cross-section shape, the roller matching with the shape of the profile can be used, which is beneficial to the support of the profile during bending deformation, and reduces the possibility of deformation of the profile cross section during bending deformation. To improve the quality of the bending deformation of the profile, the general roller shape is as shown in the figure, and the structural dimensions of the slot on the roller are determined according to the profile.

The process of forming, such as bending and bending, depending on the shape of the work or mold, can only be achieved by changing different molds to obtain different bending angles and curvatures.

The roll bending process has a distinct advantage in this respect, that is, by simply changing and adjusting the relative position between the roller and the roller, different bending angles and curvatures can be formed, which reduces the production cost and improves the production efficiency.

The roll bending process also has the disadvantage that the curved deformed section will have a straight edge of a certain length, that is, there is a small area at the front end and the end of the section which can not be bent, and the distance from the center roll to the adjacent rolls determines the straight edge. The length can only be reduced by reducing the distance between the center roller and the two rollers. The distance between the center roller and the next roller can also reduce the bending deformation of the profile. The presence of the straight edge is to a certain extent. The roll bending application is limited.

The process parameters of the roll bending process are mainly two: the relative position and bending time between the rolls. Through the computer simulation, the influence of the relative position and bending time between the rollers on the bending results of the profiles was summarized.

Computer simulation results show that the longer the roll bending time, the degree of deformation of the profile along the length and the bending radius

The more uniform and basically the same, this is determined by the amount of roll movement. A new roll bending process has been developed on the basis of conventional roll bending: Flexible Roll Forming, the principle of which is shown in the figure.

Unlike the traditional roll bending process, the flexible roll bending process has only two rolls. The rigid roll and the flexible roll are different from the rigid roll. The contact method of the flexible roll and the profile is surface contact, which can effectively avoid the occurrence of straight edges in roll bending and deformation.

Through the study concluded that: when the diameter of the rigid shaft is constant, increase the pressure of the rigid roller, the bending radius of the profile formed by roller bending will also increase, but after the rigid roller pressure increases to a certain value, it will not This affects the bending radius of the profile, which is also an important feature of the flexible roll bending process.

The ultimate bending curvature of a profile is related to the material’s properties, dimensions, and the diameter of the rigid shaft.