Research On The Original Roll Type Precision Of Hot Rolling Work Roll

Taking a 2250mm hot-rolled wide strip steel finishing mill roll roll kept the original background,ensure that the original roll is to calculate the exact roll hot roll foundation.In order to ensure the accuracy of the original roll,we need to study the temperature field on the roll,grinding roll for temperature,development of the next roll machine cooling system.Research on this subject and the temperature difference does not exceed 3?,Defined as the barrel temperature uniformity,roll on the ground after impact accuracy.From the type of hot-rolled steel to improve quality with departure,Focusing on quality assurance plate in the most basic raw roll rolls precision.Temperature conditions combined roll after hot rolling,the hot rolling mill rolls before temperature control,roll grinding process temperature field theory,roll grinding process the temperature distribution of the position,worked out under a hot wire rolling after cooling system machine.Field engineering practice shows directed to ensure the accuracy of the original roll roll cooling system,precision roller original roll was well controlled,the main contents of this paper and the main achievements are as follows:1)Analysis of the present situation of roll thermal deformation theory.Roll temperature field calculation is a prerequisite for solving the thermal crown of the roll.For solving the roll temperature field,mainly analytical method,finite difference method,finite element method.But at home and abroad are not directed to the rolls of the thermal deformation of the original roll to start to solve the basic research.2)The effect of temperature on the front roller mill roll after roll of the original mill.Hot rolling work rolls after completion of the rolling,since only the middle of the barrel in contact with the strip,roll the entire roll body temperature was in the middle of high and low ends of the state.To make rolls from the roll grinding machine under the influence of the temperature must be cooled by forced method,the roll body temperature is reduced to a reasonable temperature,under the action of grinding,grinding roller body after reaching the final temperature uniform.3)Describes the roll in a state of forced water temperature,ambient forced water cooling during the roll can be seen as a steady-state temperature field.As a roller shaft,shaft thermal deformation amount ?D =(1 + ??T)D,the traditional formula of the linear expansion coefficient in the longitudinal direction for the radial thermal deformation calculation ignores the length of the shaft member shaft Effect of the amount of change in diameter[2].Using the traditional formula,regardless of the length of the shaft,as long as the diameter of the same,at the same temperature,the amount of deformation of the same material diameter shaft parts are the same,a large n?mber of experiments show that the length of the axis of the shaft member has a radial thermal deformation impact,the same diameter shaft at different lengths the same temperature,the shaft diameter is not the same amount of thermal deformation.Roll over the entire direction of the roll body roll diameter changes,affecting the final roll roll.4)The roll grinding roll thermal influence on the original roll,cutting heat produced by machining,the workpiece thermal deformation,thus affecting the surface quality and dimensional accuracy of the workpiece.Thermal deformation size,with a variety of factors processing methods,part shape,materials,and so on stress related.When the roll grinding,can be seen as a simple physical process in a non-uniform temperature field.By field,surface residual stress and thermal deformation of research resulting non-uniform temperature of the roll,to understand the thermal deformation of the law applied to the roll grinding,it will help improve the efficiency and precision grinding.5)The original roll-type precision research status,through a large n?mber of temperature data obtained distribution conclusion roll mill before the temperature by forced cooling means to identify the mill before the temperature rolls to reach after grinding roll original roll shape accuracy maintained.