For the upper roller:<br>The problem must be that the pressure on the roller is too large, and the strength safety factor of the roller is not enough.<br>At this point, it is necessary to consider the design of a relatively leeway space.<br>The roll board process is carried out in a step-by-step and reasonably one-time process.<br>For the lower roller:<br>The problem is that there is no initial run-in.<br>The lower roller torque is more than the normal running, adding a lot of wear torque.<br>Thus, the combined stress increases and fails.<br>Therefore, should be appropriately bold roll, and pre-emption, can be prevented before the accident.
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