Domestic manufacturers are bearing structure of bonded ferrite magnets calendar, generally copper or the nylon bearing material, using grease lubrication. Bush are easy to wear, causing roll rotation runout in the process, it is difficult to ensure the product dimension tolerances. Therefore, the calendar must use high precision double-row radial roller bearings, and the use of oil lubrication, reducing wear and ensure magnetic board thickness tolerances along the length.
Because the pellets are less liquid, especially along the width direction under the influence of Intermolecular force and flexural deformation of roll, rolling out the magnetic Board in a width direction often appears thick on both sides and thin in the middle. Size variance will result in rewinding coils tight, loose on both sides. Solution of this complex structure can be used for the variance in thickness "l" type four-roll rolling mill. The calender with the axes cross and pre-bend function. However, the calendar structure is complex, expensive, covers, maintenance inconvenient and cost of building and running costs are also high. Therefore, we have designed the superior performance of two roller open the calender.