Optimal design of key structural parameters of VC roll sleeve and mandrel
As one of the models that efficiently control the quality of strip steel,VC roll has a lot of production and application experience but lacks key independent design methods.For this purpose,starting from the basic structure of VC roll interference assembly.The variation in thickness of the sleeve over the service life is taken into account and analyzed in terms of roll strength,sealing,relative sliding and effective convexity.The key structural param-eters of the optimal design of VC rolls were determined to be sleeve thickness,original interference amount,and oil cavity width.Further,based on the structural parameters and actual production process parameters of a domestic imported VC rolling mill.The effects of each key structural parameter on the sleeve crown,the actual interference force distribution,the original interference force of the filling pressure and the original interference of the filling pres-sure were analyzed.On the basis of the influence of key structural parameters on each process parameter,the design focus and ideas of each key structural parameter were determined.Finally,the strength of the VC rolls,sealing,avoidance of relative sliding,and safety from contact fatigue were considered.Based on the premise of the optimal design of the extreme production process and the ultimate working state,the evaluation index,objective function and constraints of the optimal design of the key structural parameters of the VC roll are given.And the overall process approach to optimize the design was determined.After applying the optimization design method to a domestic imported VC rolling mill.The strength safety factor,the relative sliding safety factor and the objective function under the existing parameters and the design parameters of the rolling mill structure were compared.The analysis showed that,under the premise of ensuring the crown and sealing of the sleeve,the design parameters achieved an overall improvement in strength safety,relative sliding avoidance and uniformity of interference force distribution compared with the existing parameters.The establishment of the optimal design method provides a theoretical refer-ence for the design and verification technology of VC rolls,and has certain practical application value.
NETL
NSTL
万方数据
