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Briefly on how to cleverly take the broken high strength bolt remains
In the process of using bolts in construction, bolts often break. The usual practice of maintenance and construction personnel is to use pliers to clamp outwards from the broken bolt in the opposite direction of bolt screwing, or to take out the broken bolt with a wrench with the help of a broken bolt extractor. Although these methods can take out the broken bolts, the unevenness of the bolt section and the inability to control the evenness of the torque during operation will damage the threads of the bolt holes, causing the newly installed bolts to not fit tightly and loosen, causing the bolts to break again. Therefore, we have obtained a reliable method to take out the broken bolt without causing the bolt hole thread deformation. (Guide: Bolt fracture analysis method: grasping the main contradiction method)
First make a square iron, the method of making square iron is: calculate the size of the square iron according to the diameter of the hole drilled on the broken bolt; the calculation formula is αu003dR√2, and then take a section of round steel (According to the actual size of the broken bolt, the diameter is smaller than that of the broken bolt), drill an inner hole (the diameter of the inner hole is smaller than the broken bolt) on the drilling machine, and make a sleeve. When taking the bolt, place the sleeve on the broken position of the bolt. In order to facilitate the operation, clamp it with a hand vise, and then select a drill with a smaller diameter than the made sleeve, and insert a hand drill into the inner hole of the sleeve to drill This method of drilling is to prevent the drilled hole from being skewed and not to damage the thread of the bolt hole, and at the same time, it can evenly control the torque to unscrew the broken bolt). After drilling the hole, use the square iron made in advance to drive it into the hole, and then reverse it (with tool pliers), then the broken bolt can be taken out smoothly without damaging the thread.
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