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针对510L热轧板生产卡车大梁后减震器盒在冲压成型后其转角处盒壁上端位置出现开裂的情况,对开裂零件进行了金相、扫描电镜、化学、力学等检验分析工作。分析发现落料后冲压板材未修边,成型过程中转角位置金属流动性差,堆积的金属在内侧壁上凸起,在拉应力作用下导致未修边的剪切边上的细小剪切裂纹撕裂。由于成型过程中润滑不良、位置偏差等原因使得凸模与盒壁产生了较大的附加应力,使得前述撕裂的裂纹在该应力作用下扩展形成宏观开裂。
For 510L hot-rolled plate, the rear shock absorber box of the truck girder is cracked at the corner of the box wall after the stamping. The cracking parts are inspected and analyzed by means of metallography, scanning electron microscope, chemistry and mechanics. The analysis shows that the blanked sheet is not trimming after blanking, and the metal flow at the corner is poor during the forming process. The buildup of metal bulges on the inner side wall and causes a small shear crack tear on the uncut edging side under tensile stress crack. Due to poor lubrication during the forming process, position deviation and other reasons, the punch and the box wall generate a greater additional stress, so that the aforementioned cracked crack expands to form macro-cracking under the stress.