What should I do if the tap and bit are broken in the workpiece?
For machining, taps and drill bits are often encountered in the workpiece. The following solutions are available for reference.
To solve the tap and the method of breaking the bit inside the workpiece:
1. Fill the lubricating oil and use a sharp tweezers or tweezers to knock out slowly on the fracture surface. From time to time, iron the iron (the most common method in the workshop, but for the tap hole with too small a hole diameter or the broken tap too Long may not be appropriate, but you can try).
2. Weld a handle or hex nut on the broken section of the tap and then gently reverse it (this is a good method, but the welding is somewhat troublesome, or the same is true for smaller diameter taps).
3, with a special tool: broken tap extractor, the principle is that the workpiece and tap are connected to the positive and negative electrodes, the middle of the electrolyte, causing the workpiece to discharge corrosion to the tap, and then assisted to remove the needle-nosed pliers, the damage to the inner hole is very small.
4. Take the top of the steel roll and tap it slowly with a small hammer at the tap of the tap. The tap is relatively brittle. Finally, it is knocked out into the slag, or it is simpler. The threaded hole of the broken tap is directly smashed and smashed, and the tapping is re-expanded. Some savage, if the diameter of the tap is too small, it is not good, the diameter is too big, and it is very tiring to knock.)
5. Flatten the threaded hole where the broken tap is located, and then flatten it and re-drill. Although it is difficult, it can be drilled slowly. (If the threaded hole can be changed position, when re-drilling and tapping, it is recommended to change. To the original threaded hole).
6. Cut a slot on the cross section of the broken tap and reverse it with a screwdriver (the slot is difficult to cut out, it is even harder if the tap diameter is small).
7. Drill the threaded hole of the broken tap and then inlay a wire screw or pin, then weld, smooth, re-drill and tap, which can be basically the same (this method is troublesome, but very practical) , the size of the tap does not matter).
8, with electric pulse to knock off, EDM or wire cutting can be, the hole can be reamed and wire threaded sleeve (this method is more simple and convenient, as for the coaxiality temporarily do not consider, unless your threaded hole is the same Axis directly affects the quality of the equipment).
9. Make a simple tool and insert into the flute of the broken taper section at the same time, carefully pull it out. For example, you can use the broken nut with a square twister to screw 2 nuts and use the steel wire (the number of the same number of taps and the number of taps) Insert the broken tap and the nut into the empty groove, then use the hinge to pull the square in the direction of the exit, and take out the broken tap. The main idea of ​​this method is to use the wire through the wire tapping of the broken tap. The steel needle is used as a wrench for the wire. Of course, if such a broken wire often occurs in the workshop, it is better to make such a tool wrench.
10. The nitric acid solution can corrode high-speed steel cones and not scrap the workpiece.
11. Anneal the tap with an acetylene flame or a blowtorch, then drill with a drill bit. At this time, the diameter of the drill should be smaller than the diameter of the bottom hole. The drill hole should also be centered to prevent the thread from being drilled. After the hole is drilled, a flat shape is drilled. Or a square punch and then use a wrench to unscrew the tap.
12, with the gas drill reversed, relying on the feel, because instead of directly drilling the tap, but with a slow speed and a little friction (similar to the car half-clutch) let the tap follow.
13, you can use the grinder to smooth the broken wire, and then drill with a small drill, and then gradually change to a larger drill bit, the broken wire will gradually fall off, after the fall off with the original size of the tap to re-tapping the teeth, such The advantage is that there is no need to increase the aperture.
14. Weld an iron rod on the broken object and then unscrew it. (Disadvantages: a, too small broken material can not be welded; b, the welding skill is extremely high, easy to burn the workpiece; c, the weld is easy to break, the probability of taking out the broken object is very small.)
15. Use a tapered tool that is harder than the broken object. (Disadvantages: a, only suitable for brittle fractures, break the broken material, and then slowly remove it; b, the broken material is too deep, too small to be taken out; c, easy to destroy the original hole.)
16. Make a hexagonal electrode smaller than the diameter of the broken object. Use a spark machine to machine a hexagonal counterbore on the broken object, and then screw it out with an Allen key. (Disadvantages: a. It is useless for rusted or stuck broken objects; b, useless for large workpieces; c, useless for too small broken objects; d, time consuming, and troublesome.)
17. Directly use an electrode that is smaller than the broken object and use an EDM machine. (Disadvantages: a, useless for large workpieces, can not be placed in the EDM machine table; b, time-consuming; c, too deep, easy to deposit carbon, can not fight.)
18, with alloy drills (disadvantages: a, easy to destroy the original hole; b, useless for hard breakage; c, alloy drill bit is brittle and easy to break.)
19. There is now a portable machine tool designed and manufactured by the principle of electric machining, which can easily and quickly remove the broken screw and the broken tap drill.
20, if the screw is not too hard, you can flatten the end face, then find the center point, use a small bit to go up, drill with a small bit, vertical, and then use the broken wire extractor to reverse Just go out.
21. If you can't buy the broken wire extractor, use a larger bit to continue to ream the hole. When the hole is close to the screw, some of the wire will not fall off, and the remaining wire will be removed, and then the tap will be re-trimmed.
22. If the broken wire of the screw is exposed, or the requirement of the broken screw is not strict, there is a saw with a hand saw, the saw can be sewn, and the outer casing is also sawed, and then removed with a flat-blade screwdriver.
23. If the broken wire is exposed to a certain length outside, and the melting point of the mechanical material is not too low, an extended T-bar can be welded on the screw by electric welding, so that it can be easily unscrewed from the welded rod.
24. If the screw rust is very serious, it is not easy to handle with the above method. It is recommended to add a little oil after the fire is baked red, and then use the above corresponding method.
25, after more than N efforts, although the screw is taken out, but the hole is also abolished, simply drill a larger hole tapping, if the original screw position and size are limited, you can also play a bigger Screw in, or directly weld the tapping, and then tap the small hole in the center of the large screw. However, internal metal structure problems after soldering are sometimes difficult to tap.
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