Technical Features of Top Roll Universal hydraulic plate rolling bending machine
7-1 Drum-shaped upper roller, lower roller and lower roller are matched and adjusted, high-precision product straightness
The drum-shaped upper roller is used. The drum-shaped preset amount of the upper roller is generally preset at 70% of the uniform load of the roller. The lower roller with smaller diameter and the lower part of the lower roller are supported by the upper and lower adjustable rollers. According to the load of the rolled product, the idler at the lower part of the lower roller is adjusted, which greatly improves the straightness of the product.
A. The situation of rolling thick plate B The situation of rolling thin plate
When rolling thick sheets, the idler at the lower part of the lower roller is adjusted upward; when rolling thin sheets, the idler at the lower part of the lower roller is adjusted downward.
7-2 Rear bending and rolling, high-precision product roundness
The upper roll universal hydraulic plate rolling bending machine adopts rear bending (the direction of sheet feeding is opposite to the moving direction of the upper roll). , which avoids the generation of front bending and rear corners, and can control the length and shape of the remaining straight sides.
Generally, the three-roll asymmetric type adopts front bending. First, the two ends of the sheet are pre-bent, and then symmetrically rolled to form. Skilled operators are required. The product has rear corners, and the shape of the remaining straight edges is difficult to control.
A. Upper roll universal hydraulic plate rolling bending machine B. Three-roll asymmetrical type (upper roll level adjustment type, lower roll level adjustment type, arc adjustment type, four-roller hydraulic plate rolling bending machine, etc.)
The upper roller is pressed while the lower roller is rotated. The end of the sheet is pre-bent, and then rolled symmetrically.
The end of the sheet is pre-bent by direct pressure.
The product does not have a clearance angle, and the end of the remaining straight edge is controlled. The product has a clearance angle, and the end of the remaining straight edge is controlled at
Made on the standard circle, the roundness of the product is high. The standard circle is more difficult, and the roundness of the product is not high.
7-3 Reduce the amount of product misalignment
The upper roll universal hydraulic plate rolling bending machine has taken the following measures to reduce the amount of product misalignment:
①The dimensional accuracy and shape and position tolerance of the two lower rollers and the center distance of the two lower rollers are controlled as key processes;
②The synchronous electro-hydraulic combination of the upper roller adopts the feedback system to automatically level.
Displacement sensor detection, signal amplification of the stroke preamplifier of the upper roller cylinder, comparison of the control machine, high and low level to the programmable controller, control the electromagnetic reversing valve electromagnets at both ends of the upper roller, continuous feedback and comparison, the synchronization accuracy is controlled at Within the range of ±0.15mm.
7-4 High precision end pre-bending
During end pre-bending, the length of the straight edge can be freely set by changing the amount of horizontal movement of the upper roller; the upper roller is directly pressurized to control the shape of the straight edge to achieve high-precision end pre-bending.
7-5 Rolling process
The first step: feeding the plate and aligning the material;
Step 2: The upper roller moves horizontally to the -X position and descends to the Y1 position; the lower roller is reversed to make the steel plate reach the forming position.
The third step: the lower roller rotates forward, and the upper roller is pressed down;
Step 4: The upper roller is pressed down to the Y2 position to stop, and the lower roller is continuously rotated forward;
Step 5: When the end of the plate stops, the upper roller presses down Y3 to stop, and the end of the plate is directly pressurized for pre-bending;
Step 6: The upper roller lifts Y2-α, moves horizontally to +X position, presses down the same position Y2, and the lower roller rotates forward;
Step 7: When the end of the plate stops, the upper roller stops at the Y3 position, and the end of the plate is directly pressurized and pre-bent;
Step 8: Move the upper roller to X=0, press down to the Y4 position, and reverse the lower roller to compensate for the bending.