Research On The Control Of Strip Section Profile Of Rolling AZ31B Magnesium Alloy Sheet

Known as the "21st Century Green Engineering Materials" magnesium alloy arebeing used more and more widely in aerospace, automotive, electronics and other fieldsbecause of its low density, high stiffness, excellent thermal conductivity and many otheradvantages. Compared to the traditional products which are cast by moulds, deformationalmagnesium alloy strip can fulfill the requirements of high strength and diverse mechanicalproperties. Studying on the deformational rule of magnesium alloy strips’ rolling processhas important practical significance and economical value.Section’s profile is an important indicator of strips’ quality. The control of crown isthe pivotal technology in the modern process of rolling steel. Magnesium alloy strips’rolling process is a thermal-mechanical, nonlinear process which is coupled with largedeformation. Based on the1650UCM rolling mill of some factory, the control of sectionprofile was analyzed by the finite element method. The details are as follows:Firstly, based on the finite element method, the rolling process’ simulation ofmagnesium alloy strip was completed by three-dimensional FEM models which areestablished by the software called MSC.MARC. And the rationality of my model wasverified through comparison. The strip profiles’ shifty rules about changing thedimensions of the crude magnesium alloy strips or processes’ parameters are researched toguide the formulation of rolling schedule.Secondly, based on the theory of strips’ profile, the transformational relationshipbetween flatness and crown was analyzed by means of lateral flowing factor(LFE). Lateralflowing factor can be used in researching the shifty rules of lateral metal to describe themechanism of strips’ edge drop and develop the theory of three-dimensions rolling andedge drop.In the end, the new strip profile’s control equation which is appropriate for1650UCM rolling mill was presented. The research about the influence between threeprofile’s control means and roller’s deformations,strips’ crown profile are completed. Byresearching the control property of control means，the appropriate schedule of bending rollor shifting length in a specific rolling condition will be confirmed. Especially, it will be a worthy reference for the closed-loop automatic control system of section profile and edgedrop.