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拉伸件的成形过程,视工件的复杂程度而定。拉伸模的设计和制造是否合理,须从拉伸件的各部位,测得材料的变形应力和变形方向,来判定拉伸后是否有破裂或其他缺陷,必要时还得修改模具才能生产出合格的零件。网栅法就是在板材上印制一定的图案,最常用的有方格或圆圈,然后用这种板材作拉伸试验,成形的拉伸件上,因各部位受力不同,图案便相应变形,从而可以清晰地看出各部位的材料是否按预定的方式变形,并可进一步计算出变形应力的大小,判别拉伸件
Stretching parts of the forming process, depending on the complexity of the workpiece may be. Tensile die design and manufacture is reasonable, from all parts of the tensile member, the measured material deformation stress and deformation direction, to determine whether there are cracks after rupture or other defects, if necessary, have to modify the mold to produce Qualified parts. Grid method is to print a certain pattern on the plate, the most commonly used square or circle, and then use this plate for tensile test, forming the tensile member, due to the different parts of the force, the corresponding deformation of the pattern , So you can clearly see the various parts of the material is deformed by a predetermined way, and can further calculate the size of the deformation stress, determine the tensile member