网格映射法在冲压成形数值模拟网格局部加密中的应用
The grid mapping method applying in the local refinement of the forming numerical simulation
龚志辉1,2，刘朝峰1，唐华平1
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作者单位：1.中南大学机电工程学院；2.湖南大学机械与运载工程学院
中文关键字：网格映射，数值模拟，局部细化，网格划分
英文关键字：grid mapping；numerical simulation；the local refinement；meshing
中文摘要：提出一种基于网格映射法实现板坯网格局部加密的方法，即根据细分准则，确定细分区域，通过有限元数值模拟板料冲压成形过程，将所需的工件特征轮廓线离散成点并投影到仿真结果的网格模型上，获取投影点与投影单元的对应关系以及相对位置信息，利用数值模拟过程中所建立的单元与节点的映射关系计算出投影点在坯料网格模型上的坐标，再通过曲线拟合，得到平面毛坯上工件的特征轮廓线——细化区域边界线，从而实现网格局部加密。
英文摘要：It proposes a method based on grid mapping to achieve local refinement. according to the subdivision criteria , determines the refinement of regional , then projects the discrete point of the desired contour of the workpiece features onto the grid model of the simulation results to obtain the corresponding relations and the relative position information of the projection point and the projection unit,and uses mapping relationship between the unit and node to calculate the coordinates of the projection point on the blank grid model,and then by curve fitting,gets the characteristic contour of the workpiece on the flat blanks which is the boundary line of the refinement region,thereby achieve grid local refinement.