Research On AZ31B Magnesium Alloy Sheet’s Profile Influencing Factors And Crown In Warm Rolling Process

The magnesium alloy which has the advantage of light get people’s more and moreattention, it is widely used in the fields of aerospace, automotive, communication andelectronic industry. Currently, the key way of die casting production still can’t satisfy therequest of electronic production as light and short. There is much deficiency in thin shellshape as processing stability and the properties of product, so we adopt plasticity formingmethod to be able to avoid the defect. Study on magnesium alloy board forming law andhot magnesium alloy board forming simulation technology have important practicalsignificance and economical value.Profile is one of the most important indexes of strip quality, moreover, the profilecontrol is the key technology in steel．To meet the need of high quality and productivityin strip milling, profile control is required to have a higher precision, as well as higheron-line regulation．The hot rolling process of the magnesium alloy is complex technologyprocess which Includes many non-linear factors such as geometric nonlinearity, materialnonlinearity，and contact nonlinearity and so on. This paper studies the following issues:Firstly, this paper analyzes the knowledge of the profile, focuses on the relationshipbetween the plate crown and flatness. This paper studied the model of rolling force, themodel of tension, rolling speed, middle roll shifting length and bending force, and therolling force formula was derived.Secondly, based on the theory of the profile, taking advantage of the powerfulnonlinear contact analysis functions of MSC．MARC, based on the given parameters ofthe1650mm six-high mill, a3-D rolling finite element model of six roll skin miller isestablished. This paper established some finite element model which was about therelationship between different intermediate roll shifting length, different bending force androll’s deformation, the flattening deformation, a load roll gap shape, rolling force, theplate’s thickness, the plate crown,the plate’s edge drop, tensile stress distribution. Basedon some finite element model, this paper studied that different intermediate roll shiftinglength, different bending force effect on roll’s deformation, the flattening deformation, a load roll gap shape, rolling force, the plate’s thickness, the plate crown, the plate’s edgedrop, tensile stress distribution. Combined with the six roller mill’s actual productionprocess, this paper determine the intermediate roll shifting length, the intermediate rollbending force and work roll bending force by controlling the plate crown.At last, based on the Visual Basic6.0platform, this paper makes the seconddevelopment of finite element software, it has achieved a rapid modeling and simulationfunctions.