Whatever the sector of activity, when it comes to assembly, threads are fundamentally inseparable. When it comes to threads, tapping is essential. When it comes to dental tapping, you readers may have some understanding of it. Because it is common for faucets to break during processing. Therefore, the editor provides some information below on how to remove broken taps when tapping during machining and machining, for your reference.
1. Add lubricating oil to the broken part of the faucet, use a sharp hairpin or something that can withstand force, and gradually tap the broken side. Remember to turn the iron upside down from time to time (this method is common). used in workshops, but if the hole diameter is too large, small threaded holes or too long broken taps will not fit, but you can try).
2. Weld a handle or hexagonal nut to the broken section of the faucet, then rotate it slowly (this method is a good method, but the welding is a little troublesome, as above, if the thread diameter of the hole is too small or broken. If the faucet is too long, it will not fit.
3. Use special equipment: broken faucet extractor. The principle is that the workpiece and the faucet are connected to positive and negative two electrodes respectively, pour electrolyte into the hole, let the workpiece discharge to the faucet to corrode the broken faucet, and then use a pointed nozzle to remove the broken tap. Slowly remove the vise in the opposite direction. This method will cause little damage to the inner hole.
4. Hold the steel rod against the faucet crack and hit it directly with a small hammer. Since the faucet is relatively fragile, slowly knock the faucet into the slag. You can also use the simplest method to directly drill the threaded hole of the faucet. the tap broken with a drill bit. Or drill it and re-expand and tap it (the method is a bit crude, if the tap diameter is too small it’s not ideal, and if the diameter is too large it will be quite difficult to operate) .
5. Weld the threaded hole of the broken faucet flat, then grind it flat and drill it again. Although it is difficult, you can drill it gradually (if the threaded hole can be changed location, when drilling and tapping again). it is recommended to change it around the original threaded hole).
6. At the broken faucet, cut a slot on the cross section and turn it in the opposite direction with a screwdriver (the slot is difficult to cut, and it will be even more difficult if the diameter of the faucet is small).
7. Drill the threaded hole of the broken faucet into a larger size, then insert a threaded sleeve or pin or something, then weld, grind, drill and tap from the beginning to make it the same size as the original (although this method is tedious, it is very simple). This works no matter the size of the faucet).
8. Use an electrical pulse to remove it, EDM or wire cutting will do the trick. If the hole is damaged, you can enlarge the hole and add a threaded insert (this method is simpler. As for coaxiality, don’t think about it for now, unless your threaded hole is coaxial, it affects directly the quality of the equipment).
9. Make a common tool and insert it into the chip groove of the broken tap section, and carefully pull it out in the opposite direction. For example, you can use a broken tap with a square tenon to screw 2 nuts into it, and. use steel wire (the number is the same as the number of tap grooves). Insert the broken faucet into the empty slot of the nut, then use the hinge lever to pull it in the direction of the outlet. Move the square tenon to take out the broken tap (the main idea of this method is to open the chip groove of the broken tap, and use steel wire, preferably a steel needle, to make a key specially used to remove broken wires Of course, if this happens often in the workshop (if the wire is broken, it is better to make a wrench like this).
10. Nitric acid solution can corrode high speed steel taps without damaging the part or leading to its disposal.
11. Use an acetylene flame or blowtorch to anneal the tap, then use a drill bit to drill. At this point, the diameter of the drill bit should be smaller than the diameter of the bottom hole. with the center to avoid damaging the threads. Once the hole is drilled, push in a dish or use a square punch and wrench to unscrew the faucet.
12. Use a pneumatic drill to rotate and extract, it all depends on the feeling, because the tap is not drilled directly, but the tap is turned with a slow speed and a little friction (similar to the semi-linkage of ‘a car).
13. You can use a grinder to smooth the broken thread, then use a small drill bit to drill first, then gradually upgrade to a larger drill bit. The broken wire will gradually fall off after falling, use a tap of the original. size to re-tap the tooth. This has the advantage of not having to increase the diameter of the hole.
14. Weld an iron rod to the fault then unscrew it. (Defects: a. The broken object is too small to be welded; b. The welding skills are extremely demanding and the workpiece is easily burned; c. The solder joint is easily broken and the chances of removing the broken object are very small.)
15. Use a cone-shaped tool harder than a tap for prying. (Flaws: a. It is only suitable for fragile faucets. Crush the faucet and then gradually remove it; b. The faucet is too deep and too small to remove; c. It is easy to damage the original hole .)
16. Make a hexagonal electrode smaller than the diameter of the tap, use an EDM machine to machine a hexagonal countersink on the tap, and then use an internal hexagonal wrench to unscrew it. (Flaws: a. Useless for rusty or stuck taps; b. Useless for large parts; c. Useless for taps that are too small; d. Time consuming and inconvenient.)
17. Directly use an electrode smaller than the tap and use an EDM machine. (Defects: a. It is useless for large parts and cannot be placed on the EDM machine table; b. It is time-consuming; c. When it is too deep, it will easily accumulate carbon and cannot not be pierced.)
18. Use an alloy drill bit to drill (disadvantages: a. It easily damages the original hole; b. It is useless for hard cutting objects; c. The alloy drill bit is brittle and easy to break.)
19. Now there is a portable tool designed and manufactured according to the principle of electric machining, which can easily and quickly remove broken screws and tapping drills.
20. If the screw is not too hard, you can flatten the end face, then find the center point, use a cookie cutter to drill a small point upwards, use a smaller drill bit to drill further. First, make sure it is straight and then use a broken wire extractor to twist it in the opposite direction.
21. If you can’t buy a broken wire extractor, use a larger drill bit to continue widening the hole. When the hole diameter is close to the screw, some threads will no longer be strong. Remove the remaining threads, then cut. them with a tap.
22. If the broken screws are exposed or the requirements for broken screws are not strict, you can also use a hand saw to cut the gaps, saw off the casing, and then remove it with a flat blade screwdriver.
23. If the broken wire is exposed to a certain length and the melting point of the mechanical material is not too low, you can use electric welding to weld a T-shaped elongated rod on the screw, so that it can be easily screwed. out of the welded rod.
24. If the screws are seriously rusted and cannot be solved by the above methods, it is recommended to roast them with fire, then add a little lubricating oil, and then use the corresponding methods below. above to resolve them.
25. After much effort, although the screws were removed, the holes were no longer useful. So we just drilled a bigger hole and tapped it. If the original position and size of the screw is limited, we can also drill a larger hole. The screws, or tap them directly by welding, then drill a small hole in the center of the big screw and tap. However, due to internal metal structure problems after welding, tapping can sometimes be difficult.
This is only a remedy for wire breakage after treatment. The best way is to prevent it before it happens. The best policy is to avoid breaking wires as much as possible.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
