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网格技术就是在拉深件的毛坯表面按一定规则划上许多圆圈．工件拉深后利用圆圈的变形计算应值。将工件相应点的应变值连成曲线、形成“应变构成线”、并与工件板料的成形极限图划在一起．由图可以找出拉深件的潜在裂纹位置．判断产生裂纹的变形类型。针对情况、从控制拉深条件、改进横具结构、选择工件板料等方面、采取措施防止裂纹产生。
Grid technology is in the drawing of the blank surface by a certain number of rules drawn on many circles. Deformation of the workpiece after the use of the circle deformation should be calculated. The corresponding point of the workpiece strain value into a curve, forming a “strain composition line”, and with the workpiece sheet forming limit drawing together. From the figure you can find the location of potential cracks in the drawing part. Determine the type of deformation cracks. For the situation, from the control of drawing conditions, improve the structure of the crossbar, select the workpiece sheet, etc., to take measures to prevent cracks.