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The four-high mill is a commonly used type of strip mill, it is widely used in iron and steel, non-ferrous metal plastic processing, a four-high rolling mill roll system, including: a pair of work rolls and a pair of support rollers and their bearing zero parts, when a mill production reached 50,000 tons of steel around, you need to replace the roll system, backup roll (or roll) roll body regrinding. In order to ensure the normal work of the rolling line, a mill usually need three sets of roller system as a spare, the introduction of our company's old quarter 1600 and the new district 2150CSP rolling line is currently the world's more advanced continuous casting and rolling production line, rolling line from F1-F7 composed 7 finishing mill. The bearing design provided by the German company SMS DEMAG, is one of the core components of the mill. Its level of accuracy, a direct impact on the quality of the rolled products. Its structure is relatively complex, high precision bearing bore wall thickness difference is so big, uneven thermal stress and deformation is very conducive to machining and, at the same time is also very high on both sides of the face of the shape and position of the bearing bore tolerance requirements. Its processing directly affect the accuracy of assembly accuracy. Has been bearing spare parts are imported from abroad for this situation, the key technologies of the mill bearing precision machining, improve processing quality of the bearing to meet its requirements to the domestic import substitution purposes. In this paper mill bearing object of study, first of all, according to the bearing structure and its technical requirements, analysis Precision Machining key technology of rolling bearing, the bearing seat bearing bore precision control, geometric tolerance control on both sides of the face of the bearing bore, long, deep hole processing. Second, analysis the mill bearing bearing bore deformation of factors, namely temperature, clamping, lifting, cutting force, the process system stiffness and residual stress. With ANSYS to temperature, clamping, lifting, cutting forces carried out a quantitative calculation, to arrive at a range of temperature and cutting force, the clamping force of the size and location of the lifting of the ways and means, to ensure that the mill bearing bearing hole The deformation within tolerance. Then, according to the results of the analysis, the preparation of a reasonable process, the focus is to reduce the residual stress, the processing temperature difference, cutting force, clamping and lifting mill chock bearing bore to ensure the accuracy of the processing mill bearing bearing bore in line drawings and use requirements, the use of numerical control system to ensure that both sides of the bearing seat geometric tolerance in the face of the bearing bore, the use of \Finally, through the experiment, the problem of matching the right tool manufacturing mill bearing processing improvements, sum up experience, the solidification process parameters.
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