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Cold heading machine is a special equipment mainly used for batch production of fasteners such as nuts and bolts. The earliest cold heading machine in the world originated from Germany. At that time, the purpose of developing the cold heading machine was mainly to manufacture a large number of bullet casings in World War II.
After surfacing, hammer the end face of the cold heading machine to make the broken bolt vibrate along its axis The heat generated by the previous arc and subsequent cooling plus the vibration at this time will loosen the thread between the broken bolt and the body. After careful observation, when it is found that there is a trace of rust leaking from the fracture after striking, take the M18 nut and put it on the stud of surfacing welding and weld the two.
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