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螺栓拧断在孔里怎么取出来?不同情况该用什么方法?
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螺栓断头取出方法取决于断头位置:
- 断头露出表面≥3mm:用管钳/大力钳夹持逆时针旋出,或焊接螺母后用扳手旋出。操作前先喷渗透松动剂等待10-15分钟。
- 断头低于表面:先用中心钻打定位孔,再用比螺栓小径小1-2mm的钻头钻孔,然后旋入反牙断头取出器。
- 高硬度断头(10.9级以上):普通钻头无法加工,需用含钴钻头或硬质合金钻头,或采用电火花加工(EDM)。
注意事项:拆卸前充分渗透松动剂,必要时用喷灯加热至200-300°C利用热膨胀差异松动锈蚀,但需注意不要损伤密封件。避免暴力操作导致断头进一步碎裂。