Research On The Influence Of Geometric Shape On The Uniformity Of Single Point Incremental Forming

The single point incremental forming technology is a flexible forming technology in the integration of design and manufacturing.It is based on ‘layered manufacturing’idea.The complex 3D model of the target is dispersed into a series of point of twodimensional level along the Z axis,and The final target product desired is accumulated formed in each layer on the surface of the two-dimensional layer by layer..First of all,the basic theory of single point incremental forming was introduced.For the single point incremental forming process,the stress,deformation and thickness in deforming area were analyzed in detail,and the friction and lubrication mechanism for single point incremental forming were described.In addition,the pass plan and forming tool trajectory for single point incremental forming were described,and the wall thickness uniformity of the parts were discussed.Secondly,the numerical simulation methods and experimental methods were introduced in this research,and the process of numerical simulation and experimental methods were analyzed and described.The subject mainly describes the numerical simulation unit selection processes and constant definitions,the definition of grid material model,the definition of friction conditions,and constraints reach contact handling.At the same time,the analysis and description of the experimental equipment such as forming tools,devices and fixtures needed for the experiment of this subject were performed.Thirdly,taking a square cone part for example,the square cone parts of 1:1,1:1.5,1:2,1:2.5 and 1:3 were analyzed and studied respectively.In the process of Numerrical simulation and experimental verification,The area and forming depth of the metal plates involved in the deformation under the various proportions are the same,and the process parameters such as the diameter of the forming tool head and the pressing amount are also the same.here are same the proportion of sheet metal blank under the condition of the deformation area,and forming depth is the same,forming tool diameter and load processing parameters were also the same,forming a cone.Then,the maximum wall thickness difference of the cone under was found each ratio condition,and the maximum wall thickness difference was analyzed and compared.If the maximum wall thickness difference was smaller,the wall thickness of the formed conewould be more uniform.Thus,the length-width ratio with the smallest influence on the wall thickness of the square cone is obtained.finally,experiments were used to verify the feasibility of the results of numerical simulation experiments.Finally,The ratio of side length with the smallest wall thickness of the square cone was used and the optimal process parameter combination was used.Positive pentagonal cones,regular hexagonal cones,regular octagonal cones,regular dodecagonal cones and cones with same surface area were numerically simulated.the maximum wall thickness difference of each polygonal cone was found,and all numerical simulation were verified by experiments.At the same time comparing the numerical simulation results with the experimental results,which determined the feasibility of numerical simulation results.Then the trend of different polygon cones was obtained.