| Precision Strip Slitting unit is one of the core equipment of stainless steel ultra thin strip finishing line.Its accuracy directly affects the trimming quality of strip and the accuracy of slitting width.In view of the uneven tension provided by the tension pad during the operation of a Precision Strip Slitting unit,the edge strip is not rolled tightly;According to the field production data,the finite element model of the tension pad unit and the deformation body at the slitting slitter unit is established by using the finite element software ANSYS,and the motion model of the guide roller to maintain the stable and constant tension coiling of the strip is established.Some practical problems on site are solved,which has reference significance for shortening commissioning cycle,reducing commissioning cost and formulating more reasonable slitting,slitting and coiling process parameters.The main work of this paper is as follows:(1)According to the brand(composition)of stainless steel very thin strip provided by the production site,the mechanical property parameters of the strip are obtained through tensile test and JMat Pro mechanical property software,which provides accurate data for numerical simulation;By analyzing the operation status,structural composition and actual production parameters of a Precision Strip Slitting unit,the finite element model parameters,load constraints and boundary conditions are determined according to the on-site process procedures and on-site actual production conditions.The finite element model of the tension generation process at the tension pad and the very thin strip slitting process is established by using the finite element software ANSYS.(2)Through the analysis and research of the finite element model of the tension pad part,it is found that changing the strip from the equal width specification to the unequal width specification,trying to make each steel strip bear the force of the two wood blocks at the bottom and adjusting the initial value of the pressure provided by each tension pad separately can effectively improve the uneven stress phenomenon of the tension pad part,solve the problem of loose coiling of the strip at the edge of the on-site production line,and enable the smooth production of the very thin strip longitudinal shear production line,And reduce downtime and commissioning time.(3)Through the analysis and research of the finite element model of the longitudinal shear process of the very thin strip,the more appropriate shear blade clearance and overlap range of 304 stainless steel very thin strip under the current working condition are obtained.At the same time,the residual stress distribution experiment of the shear edge of the very thin strip after slitting and the super depth of field morphology experiment are used to verify the experiment.In addition,after the finite element model is built,for other stainless steel very thin strips with different working conditions and specifications,they can be introduced into the model to obtain the corresponding shear blade clearance and overlap range,and then conduct more accurate experimental research,which can shorten the debugging cycle and reduce the debugging cost.(4)The reasonable design parameters and process parameters of the coiler used in the longitudinal shear unit of the very thin strip finishing line are selected;At the same time,the constant tension control mode adopted by the coiler and the movement control model of the guide roller are established to further realize more accurate constant tension coiling.Through the co MParative analysis of finite element simulation data and actual production data,it shows that the tension and shear model has certain practicability.It also provides a reference for other grades of stainless steel ultra thin strips to obtain excellent quality on the slitting finishing line. |
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