The cold rolling mill is always drifting off course
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Hello everyone. Please discuss how to address the issue of the cold rolling mill constantly drifting out of alignment. Also, at what extent of wear should the rollers on the cold rolling mill be replaced? The deflection wheel always gets stuck – how to deal with it? Thank you
Is what the original poster is referring to the cold slag machine? The slag cooler in our factory has experienced deviation from its proper alignment (this is very rare; I only encountered it once in 3 years). The maintenance staff fixed it, but no corrective actions were taken ； However, the metal hose for water supply to the slag cooler in our factory has burst many times; each time we had to replace it, and to this day we still haven’t thought of any better solution.
It’s a cold rolling mill; ours often deviates from the intended path. What kind of cold rolling machine do you have?
What to roll? It seems that overload and improper installation adjustment are the most likely causes. I’ve worked with cold-formed steel for a few years; rolls are used for shaping steel plates. Here are some suggestions for reference: When the rollers deviate from their proper position, it is important to ensure that the pressing forces on the left and right sides are balanced. The pressure difference between the upper and lower rollers should not be too large. (Adjust the downward pressure using the bolt with a scaled indicator.) (If pressure is applied hydraulically, pay attention to the pressure and stroke.) Be careful not to overload the speed control motor. (Sacrifice the rolling speed during startup; try to run at high speed once it is started.) When installing the rollers, it is essential to ensure that they are level and aligned in a straight line. (Each time the rolls are replaced, the wires must be pulled to align and level them.) In terms of design: 1. The front section of the rolls is designed with a reverse bend, which helps to eliminate stress and prevent deviation. 2. The bending deformation angle of each roll has a certain range (for cold-rolled sheets, it is related to the thickness); design documents need to be consulted. 3. The moment of inertia of the rolls must be sufficient; using a powerful drive for a relatively small roll can easily lead to deviation. (If the frame is not replaced, it is usually necessary to increase the number of passes and reduce the deformation between passes.) There is generally a service life for roller replacement; in practice, the decision is mainly based on the level of wear that can be tolerated on the outer surface of the steel plate. Upright rolls should not be under severe compression for long periods of time (this can cause wear on the edges of the plate, affecting the quality of the finished product); they are generally used only for guidance purposes. (Adjust the pressure on the left and right side of the leveling roller to make corrections)