Mechanical knowledge of cold roll forming machine
The cold forming process of profile is similar to the bending process in technology. It is not a pure rolling process, but a special production way. The profile made by this way has thin wall, small weight, large rigidity, complex shape and large length.The main equipment for the production of cold-formed profiles is the cold forming machine unit , which has many classification methods.According to the products produced, the forming machine can be divided into profile forming machine and electric welding pipe forming machine; according to the frame type, it can be divided into cantilever forming machine and gantry forming machine; according to the forming machine mechanism, it can be divided into roll forming machine, row roll forming machine and crawler forming machine.
The horizontal roll is the transmission frame, which takes on the main task of tube blank deformation. The vertical roll is passive, which is set between two horizontal rolls or in groups. Its main function is to guide and also participate in partial deformation, and prevent the deformed strip steel from springback.
The cold roll forming process is shown in Figure 2-1.When the metal strip passes through several pairs of roller with pass in turn, the rotating plate strip of the roller is fed forward and bent continuously at the same time, so as to obtain the workpiece with the required section shape,so that roll forming is a continuous bending forming method。Figure 2-2 shows the forming conditions of different cross-section belts of the second pair of rollers in Figure 2-1。The plate belt begins to bend at the roller population, and moves forward at the same time. When it reaches the roller center section 4, the forming in the second pair of rollers ends, and it passes through the roller, and then enters the third pair of rollers.
Cold roll forming is a plastic processing method that the whole length of the strip passes through several different passes in turn, the part is gradually bent and deformed, the shape of the whole section is gradually close to the shape of the finished section, and the product with uniform section is finally obtained. The pass is formed by the contour of two or more forming rolls (also known as roll,mill roll) with a certain shape. The forming roll may be horizontal roll or vertical roll. Pass is one of the most important factors affecting product quality and productivity. The forming roll is installed on the frame. The forming roll which is responsible for driving the strip forward is driven by the motor through the transmission system. Generally, only the horizontal roll is the active roll and the vertical roll is often the passive roll. Each frame is called a forming machine. Each forming machine is equipped with two or more forming rolls. Each forming machine unit is composed of more than two forming machines.
