Research on the characteristics of cold-rolled deformation zone of thin strip and the applicability of contact pressure model
In the process of cold rolling of thin strip,the roll will produce different degrees of elastic flattening,and the different understandings of this phenomenon in each deformation in each deforma-tion zone theory lead to significant difference in its calculation accuracy and application range.There-fore,the finite element method is used to analyze the variation law of the characteristics of the deforma-tion zone in the process of cold rolling of thin strip,and the derivation characteristics,prerequisites and applicable intervals of the three contact pressure models of Stone total slip,Johnson full elasticity and combined type are compared and explored.The results show that with the increasing of the elastic flat-tening degree of the roll,the contour of the deformation zone undergoes arc shape,arc flattening en-largement,non-arc shape and nearly linear shape,and the occurrence of neutral zone and the increasing proportion of the deformation zone are the main reasons for the rapid decrease of the actual depression rate and the rapid increase of the shape coefficient of the deformation zone.By comparing the simu-lated and theoretical values of the contact pressure curve in the deformation zone,it can be found out that the Stone model,Johnson model and combined model are suitable for rolling conditions where the pass reduction ratio is greater than 10%,less than 1%and 1%～10%,respectively.
thin strip cold rolleddeformation zone profileelastic flattening of rollsneutral zonecon-tact pressure
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