Method for separating broken screw in screw hole

Abstract

The invention provides a method for separating a broken screw in a screw hole. The method comprises the following steps: pouring gel which can be tightly combined with a fracture surface into a screw hole which is above the fracture surface of the broken screw; adding a curing agent to solidify the gel; forming a solid filling section with certain hardness on the fracture surface of the broken screw, so that the filling section has a flat end surface in the solidifying process; establishing a center point on the flat end surface of the filling section, and punching inwards from the center point by virtue of a drill until the drill drills into the fracture surface of the broken screw for a certain depth; entering the front end of a broken screw separating tool into the fracture surface of the broken screw from an open pore; screwing out the broken screw and the filling section above the fracture surface along the thread through the broken screw separating tool. According to the method, the punching difficulty on the fracture surface can be obviously reduced, the risk of drill deviation in the punching process is removed, the open pore is favorably kept at the center point of the fracture surface, and the operation of separating the broken head by using an existing tool is relatively simple and convenient.

Description

technical field [0001] The invention relates to the field of mechanical processing, and more specifically, to a method for separating deadhead screws. Background technique [0002] During the installation, maintenance and replacement of parts of various mechanical equipment, bolts are often disassembled. In some cases, due to excessive disassembly force, improper force direction, insufficient strength of the bolt itself, long-term corrosion, and consolidation with the screw hole, the bolt will break, resulting in that although the bolt nut and the integral part of the nut The screw is removed, but there is still a section of broken screw in the screw hole, such as figure 1 shown. Because the broken head screw is completely embedded in the screw hole, there is no exposed part, so it is more labor-intensive to separate it. [0003] In order to speed up the separation of broken screws, people have developed special tools, figure 2 That is one of them. From figure 2 Look...

AI Technical Summary

Problems solved by technology

When drilling on such a section, the drill bit is easy to deviate, and it is not easy to keep it at the center point

If the position of the drilled hole is offset, it will affect the wedging or tapping of the above tools, and it is also not conducive to screwing out the dead end screw along the thread

Moreover, once the deflected drill touches the inner wall of the screw hole, it is more likely to damage the thread above the section

In order to overcome this adverse effect, the main means in the prior art is to try to smooth the section, but the operation is relatively difficult, time-consuming, and the effect is not ideal

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