Design And Analysis Of Stretching Mechanism Of Metal Mesh

With the continuous development of the construction industry,the metal mesh has been widely used in housing construction due to its superior performance,which has a very broad application prospect.However,at present,the manufacturing equipment and process for metal mesh are still not good enough,and the quality and production efficiency of the products need to be further improved.Therefore,it is of great significance to improve the manufacturing equipment and process.This paper was focused on solving the fishtail defects existing in the metal mesh.The DD0.5×690×2440 model of metal mesh widely used in engineering was the research object.The causes and characteristics of the defect were clarified through modeling,theoretical analysis,simulation and other methods.The structure of the equipment was improved on the basis of the existing one,and the influence law of each structural parameter on product quality was explored.First,the principle of the diagonal pull method of the metal mesh was analyzed,and the cause of the fishtail defect was obtained by establishing the spatial geometric model of the stretched metal mesh and theoretical analysis.The forming process of the metal mesh was further observed,and the geometric characteristics of the fishtail defect were clarified by simulation.Next,a single mesh was extracted for analysis,a simplified mechanical model was established,and the distribution of the plastic zone on the rib and the amount of tensile force required for deformation were derived.In order to further supplement the constraints on the shape of the mesh,the concept of the mesh rib curve was proposed.The relationship between the displacement load and the stress on the mesh ribs during the stretching process was analyzed and compared.Then,in order to solve this defect,two new expansion arm structures,namely curved side arms and curved arms were proposed.The stretching of the mesh was simulated under the expansion arms of the two structures through the display-implicit solution technique of ANSYS/LS-DYNA.A complete quality evaluation index was proposed to verify the optimization of the two structures on product quality,and further parameter analysis of the curved arm was made.Finally,the experiment was implemented separately to explore the influence of the initial angle and curvature of the curved arm on the product quality,and the recommended values were used to guide the production.Based on the shrink compensation method,the implicit solution function in LS-DYNA was used to obtain the contraction of the mesh under each load step,and finally the contraction amount of the whole mesh were determined.