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如图1所示的钢圈是 EM7型手扶拖拉机中的一只零件,材料为 A3钢,料厚为3mm。拉深时常在口部产生突耳。据现场调查结果有18%的钢圈在突耳方位的 R13表面上产生明显裂纹。其中部分钢圈口部的裂纹已扩展成裂口。
The steel ring shown in Figure 1 is a part of an EM7 walking tractor made of A3 steel with a material thickness of 3 mm. Pull often produce lugs in the mouth. According to field survey results, 18% of the rims produced obvious cracks on the R13 surface of the lugs. Some of the rims in the mouth have cracked into cracks.