xiehe model

In the process, the most common method of threading structures in small holes is tapping. However, during the use of the tap, due to improper operation, the hole bottom is too small or the hole is too deep, the misoperation of the tap is often caused, resulting in the phenomenon of broken ends. How to take out the broken part of the faucet that is still in the tap hole?

Method 1: You can use a small punch to punch out slowly, or break the tap to make a three-jaw special tool and extend into the chip groove. The large faucet can be built with electric welding, or it can be used as a flame rod faucet. After annealing, take it out with an electric drill, ablate it with an electric spark, screw two nuts with eight taps, and then use three steel wires to penetrate the chip flute, and the inner holes of the chip flute of the tap are aligned. If it doesn't turn, if the piece is not big, put it in the fire and turn it on.

Method 2: The material is high-speed tool steel. If the thread take-up cannot be taken out, it can be heated to 1200-1300 degrees with oxygen, then cooled with water to break it, and then knocked off the broken cone with a corresponding object.

Under normal conditions, the taper of a cast iron is easily removed by a wire take-off. This is because the brittle material is less deformed during the tapping process, and the screw holes are formed by direct cutting, and the steel sheet is in the tapping process. Due to its good plasticity, a part of the material is plastically deformed to increase the thread height, and it also increases the friction between the tap and the thread profile, making the tap difficult to disassemble. However, the steel is still in the austenite solid phase around 1200°C. Short-term heating will not cause grain growth and affect the mechanical properties of the material.

Method 3: According to the different processing holes, if it is a blind hole, it is better to leave a little more outside the broken tap. Grab the broken faucet directly with pliers and unscrew it with a pocket knife. It will be even more difficult if you drive all the broken faucets in, you can only hit sparks, and the cost is too high, so do it yourself.

Method 4: If it is a through hole, the normal tap is broken. Use a wire cut to cut the wire in the transverse direction. Generally speaking, it can go down. If the screw is broken, the fine hole must be drained before the thread is trimmed.