Before introducing how the plate rolling machine works, it is necessary to analyze the process of coiling deformation to help understand how the steel plate rolling machine works from the most basic principle.
According to the characteristics of rounding deformation, the rounding process can be divided into elastic deformation, elastic-plastic deformation, and pure plastic deformation stages. In the initial stage of the bending of the barrel blank, the external bending moment is not large, and the data of the internal stress is less than the yield limit of the material. It only causes elastic deformation inside the blank, called the elastic deformation stage. When the value of the external bending moment continues to increase, the internal stress exceeds the yield limit, then the deformation in the deformation zone of the blank will transition from elastic deformation to elastic-plastic deformation and pure plastic deformation. The upper stress of the rough section transitions from the outer layer tensile stress to the inner lamination stress. There must be a layer of metal in the middle, and its tangential stress is zero. Similarly, the distribution of strain transitions from the tensile stress of the outer layer to the compressive strain of the inner layer, during which there must be a layer of metal with zero strain, that is, when the coil is deformed, its thickness is unchanged, and it is called the strain neutral layer. This is the basis for accurately calculating the unrolled size of the round blank, that is, the stress-neutral layer coincides with the strain-neutral layer and is in the middle of the thickness of the blank; when the deformation is large, the stress-neutral layer and the strain-neutral layer move inward, And the displacement of the stress-neutral layer is greater than the displacement of the strain-neutral layer.
We have introduced the basic principle of the round deformation process. The following introduces how the 3 roller plate rolling machine works.
The axis of the three-shaft rollers of the symmetrical three-axis steel plate rolling machine are arranged in an isosceles triangle. Its two lower shaft rollers are synchronized and active, so the position is fixed. The upper shaft roller is driven to rotate and can be adjusted vertically. In order to facilitate taking out the rolled cylindrical workpiece, one end of the supporting portion of the upper shaft roller is movable. The driving shaft roller is driven by the motor and the deceleration mechanism and rotates in the same direction at the same speed (it can also rotate in the opposite direction). Due to the friction between the shaft roller and the plate, the sheet material moves forward and the upper shaft roller rotates. By appropriately adjusting the position of the upper shaft roller downward, the sheet can be rolled with different curvatures.
If the workpiece cannot reach the required curvature after one rolling, the upper shaft roller can be appropriately lowered, and then rolled again in the reverse direction, so that it is repeated many times until it is rolled into the desired shape.
The three-shaft rollers of the symmetrical three-axis steel plate rolling machine are arranged in an isosceles triangle, so during the bending process, both ends of the workpiece will inevitably leave straight segments. The length of the straight section is approximately equal to half of the center distance between the two lower shaft rollers. This part of the straight section is where the shaft roller cannot be rolled. This is also the biggest disadvantage of the symmetrical three-axis plate bending machine.
The method of arranging the axis rollers of the three-axis asymmetric steel plate bending machine is designed to eliminate the straight line segment on the rolled workpiece. The characteristic of this plate rolling machine is that the two lower shaft rollers can be adjusted vertically. You can adjust any of the lower shaft rollers to a position with a small center distance from the upper shaft roller, and adjust the other shaft roller upward to a suitable position to press and bend the starting end of the steel plate. After rolling halfway, change the arrangement of the two lower shaft rollers and continue rolling to eliminate the straight section at the end of the workpiece. It is also possible to turn the workpiece around and change the end to roll to achieve the purpose of eliminating the straight line.
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