The development of science and technology and the continuous study and introduction of foreign coil technology have greatly improved the production technology of coil equipment in China. In recent years, China's production of three roll horizontal down and four roll plate rolling machine has increasingly replaced in the coil equipment has been the main position of the symmetrical three roll plate rolling machine. With the continuous improvement of the production technology of hydraulic products, the precision and performance of domestic hydraulic components have reached a higher level. Therefore, hydraulic transmission is increasingly used in coil equipment.
The rolling plate is the process of continuous three-point bending of the plate by the rolling machine. The equipment places the plate material between the upper and lower working rollers when rolling the plate. The upper roll is raised and lowered vertically, and the two lower rollers are rotated and moved horizontally relative to the upper roll spindle surface. When the upper roll falls, the plate is bent by plastic deformation between the upper and lower working rollers. Continuous rotation of the lower roll drives the steel plate forward and backward through the friction between the plate and the roll to complete the rolling.
Let's have a look at the rolling process of the plate winder, which can be roughly divided into four steps:
1. Pre-bending. When the plate is rolled, both ends of the plate have a length that does not bend due to the lack of contact with the upper roller, which is called residual straight edge. In the process, the minimum moment arm that the plate begins to bend is called theoretical residual straight edge, and its size is related to the equipment structure and its bending form (symmetric bending, asymmetric bending).
2. Alignment. The aim of the alignment is to make the workpiece busbar parallel to the roller axis to prevent the distortion.
3. Roll the circle. Coil circle is the main process of product forming, divided into one feed and multiple feed, and rolled thick plate is often used multiple feed. The number of feed times depends on the process limiting conditions (such as the maximum allowable deformation during cold coiling) and equipment limiting conditions (such as non-slip conditions and power conditions). When the rebound amount of cold coiling is significant, a certain amount of over coiling must be added.
4, rounded. The purpose of circle straightening is to make the curvature of the whole circle uniform and ensure the quality of products. The general rounding process is divided into three steps:
(1) loading: according to experience or calculation, adjust the working roller to the position of the required maximum corrected curvature.
(2) rounding: roll the roller for 1-2 circles under the corrected curvature, so that the curvature of the whole roll is uniform.
(3) unloading: gradually remove the load, so that the workpiece in the gradual reduction of the corrective load under multiple rolling.
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