Disassembly method for broken bolts of welded metal bellows

Writer： admin Time：2021-10-14 22:38 Browse：℃

welded metal bellows vacuum valve has a broken bolt disassembly method. The bolt is broken in the screw hole, which is troublesome during disassembly. Several methods of screwing out broken head bolts. The method of screwing out the square tenon of the file and the method of screwing out of the pipe wrench is suitable for the broken bolt with a height of 5mm or more outside the screw hole; the spot welding method is suitable for the broken bolt outside the screw hole or the broken bolt and the screw hole are flush. It is made of flat steel drilled with a hole smaller than a screw hole. It is screwed out after filling the hole by spot welding; the square hole wedge screwing method is suitable for bolts that are broken in the screw hole. The method is to first Drill a small hole in the middle of the bolt, knock it into the small hole with a square hole taper, and then unscrew it; The drilling and tapping recovery method is suitable for the situation where the bolt cannot be taken out. It is to level the bolt section first, and then use A drill bit smaller than the inner diameter of the thread is drilled by tapping the original thread. Before using the above method of screwing out the broken head bolt, some conventional measures should be taken, such as kerosene soaking and cleaning the surface of oil stains and rust (this is especially important for the screwing method of spot welding, otherwise the welding is not strong). If necessary, heat around the bolts and screw out the bolts under thermoplastic conditions. To unscrew broken bolts, chemical corrosion methods can also be used to properly clean the rusty and corroded bolts and screw holes, which will speed up the unscrewing of broken bolts (after screwing out the bolts, water should be used to flush the screw holes to avoid residual chemical corrosion. Valve)."