Under normal circumstances, the working ability of the plate rolling machine refers to the thickness of the plate that it can roll, that is, the plate in the cooled state according to the specified yield limit, and the roll of the maximum thickness and width of the plate in hours Of the smallest diameter. Under normal circumstances, the ability for cold rolling is about half of that for hot rolling. However, it is the cold rolled talent that is constantly developing.
In summary, according to the various types of coils, I have formulated the following different plans, and analyzed and proved them separately.
There are only two rollers in the rolling machine. The upper roller is a roller made of steel, and the lower roller is a roller with elasticity. It can also be used for straight movement. When the rolling machine starts working, first, the lower roller starts to rotate to promote the sheet and the upper roller to press the board into the elastic layer of the lower roller under the action of the moving pressure, so that the lower roller elastically deforms. However, the volume of the lower roll has not changed during the change of the attack, so the pressure is transmitted to all sides, so that a strong and continuous back pressure is generated, forcing the sheet to be in close contact with the rigid roller, and finally the board can be Roll out the drum. The depth of the upper roll pressing the lower roll, the deformation of the elastic layer, is the primary process parameter that determines the tortuous radius formed. The conclusions are obtained through repeated experiments: the larger the reduction, the smaller the bending radius of the sheet; but when the reduction reaches a certain value, the bending radius tends to be stable, which is almost independent of the reduction. This is an important feature of the twin roll plate rolling machine process.
The double-roller rolling machine has the advantages that other rolling machines do not have: 1. The processed plates can be directly processed without the need for pre-bending, so the production speed is fast; 2. The structure of the rolling machine is simple and the price is low. 3 Different types of data can be processed. Disadvantages of the double roll plate rolling machine: 1. Each curved product has a corresponding upper roll for processing, so it is not suitable for products with different curvatures in small batch production; 2 Generally only used for sheets below 10mm The thickness is processed, and the processing effect on the excessively thick plate is poor.
The upper rollers are symmetrically located at the center of the two lower rollers. The structure is simple and compact, easy to manufacture and repair, light weight, small investment, accurate molding, and small roller force. However, the full length of the plate cannot be bent. The length less than half of the interval between the two lower rollers is straight, that is, the remaining straight edges are large, and pre-bending equipment is required, as shown in Figure 5.
The upper roll is slightly offset from the lower roll, the structure is relatively simple, and there are fewer straight edges. However, the sheet needs to be turned around and bent, which is inconvenient to operate. The roller is stressed, and the bending can be small. Thin and short light tube joints, the work ability is generally below 32 × 3000mm, as shown in Figure 6
Figure 6 Asymmetrical plate rolling machine 2.1.3 Plan 3 Four-roller plate rolling machine Figure 7 Four-roller plate rolling machine Four-roller plate rolling machine has four rollers, the upper roller is an automatic roller, the lower roller can move up and down, and two sides The roller can be raised and lowered diagonally. The characteristics are that the plate is convenient to align and the process is versatile. It can directly complete the pre-bending of the plate. It does not need to turn around when it is rounded. It can correct defects such as skew and misalignment. But the mass is large and the structure is complicated. The clamping force of the upper and lower rollers severely damages the workpiece due to oxidation pressure, and the operation skills are difficult to grasp. It is often used in heavy workpiece rolling and high automation level.
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