SWRCH22A圆头十字螺栓开裂原因分析及改进
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摘要
冷镦钢盘条SWRCH22A在使用时由于变形较大,在加工圆头十字螺栓过程中螺栓头部发生冷镦开裂。为改善SWRCH22A盘条的性能,降低冷镦开裂概率,采用金相组织检测、扫描电镜及能谱分析等手段对螺栓开裂试样进行了检测分析。结果表明:螺栓头部开裂处对应杆部位置无明显表面缺陷,近表面存在长条夹渣,夹渣成分与连铸保护渣成分相类似。造成SWRCH22A圆头十字螺栓开裂的主要原因是连铸过程卷渣导致材料近表面夹渣在冷镦成型开裂。
When the cold heading steel rod SWRCH22 A is deformed during use,the head of the bolt undergoes cold heading and cracking during the processing of the round head cross bolt.In order to improve the performance of SWRCH22 A wire rod and reduce the cracking probability of cold heading,the metal cracking specimens were detected and analyzed by means of metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that there is no obvious surface defect in the position corresponding to the stem at the cracked head of the bolt,and there is a long slag inclusion on the near surface.The composition of the slag is similar to that of the continuous casting mold.The main reason for the cracking of the SWRCH22 A round head cross bolt is that the slag in the continuous casting process causes the slag on the near surface of the material to crack during cold forming.
When the cold heading steel rod SWRCH22 A is deformed during use,the head of the bolt undergoes cold heading and cracking during the processing of the round head cross bolt.In order to improve the performance of SWRCH22 A wire rod and reduce the cracking probability of cold heading,the metal cracking specimens were detected and analyzed by means of metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that there is no obvious surface defect in the position corresponding to the stem at the cracked head of the bolt,and there is a long slag inclusion on the near surface.The composition of the slag is similar to that of the continuous casting mold.The main reason for the cracking of the SWRCH22 A round head cross bolt is that the slag in the continuous casting process causes the slag on the near surface of the material to crack during cold forming.
引文
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