Broken taps and drills in the workpiece make people depressed: 25 solutions
1. Add lubricating oil to the tap rupture, use a sharp tassel or cut something that can bear the force, and gradually knock it out on the reverse side of the break. Don't forget to pour the iron from time to time (this method is commonly used in the workshop, but if the hole diameter is too large) Small threaded holes or broken taps are too long to fit, but can be tested).
2. Weld a handle or a hex nut on the tapped section, and then slowly turn it out (this method is a good way, it is a little troublesome to weld, the same as above, if the hole diameter is too small or the broken Taps are too long to fit).
3. Use special equipment: broken tap extractor, the principle is that the workpiece and the two ends of the tap are connected to two positive and negative electrodes, fill the hole with electrolyte, let the workpiece discharge to the tap to corrode the broken tap, and then use a pointed mouth The vise is slowly taken out in the opposite direction. This method has little damage to the inner hole.
4. Take the top of the steel rod at the tap of the tap and directly tap with a small hammer. Because the tap is relatively brittle, slowly tap the tap into slag, or you can use the simplest method to directly drill the threaded hole of the broken tap with a drill. Or boring, tapping from a new reaming method (the method is a bit rough, if the diameter of the tap is too small, it is not ideal, the diameter is too large, it is very hard to knock).
5. Weld the threaded hole of the broken tap, grind it again, and drill from the beginning. Although it is difficult, it can be gradually drilled in. (If the threaded hole can change its orientation, when drilling from the beginning to tap, the idea is still to change to Around the original threaded hole).
6. At the broken tap, cut a slot in the cross section and use a screwdriver to twist it in the opposite direction (that slot is difficult to cut out, it is even more difficult if the diameter of the tap is small).
7. Drill the threaded hole of the broken tap large, and then inlay a wire nut or pin, and then weld, smooth, and tap and tap from the beginning, which can be the same as the original size (although this method is troublesome, it is very Useful, tap specifications do not matter).
8. Use electrical pulses to knock it off. EDM or wire cutting will do. If the hole is damaged, you can expand the hole and add a wire sleeve. (This method is simpler. As for coaxiality, don't consider it for the time being, unless your screw hole is coaxial Degree directly affects the quality of the device).
9. Make a common thing to pierce the chip removal slot of the broken tap cross section, and carefully pull it out in the opposite direction. For example, you can screw 2 nuts on the broken tap with a square tenon, and use steel wires (the number is the same as the number of tap slots). Pierce into the empty slot of the broken tap and nut, and then use the hinge to pull the tenon in the withdrawal direction to remove the broken tap. (The main idea of this method is to wind the chip removal slot of the broken tap. Using steel wires, it is best to Steel needles are used to make a broken wire wrench. Of course, if such broken wires often occur in the workshop, it is better to make a wrench like this).
10. The nitric acid solution can corrode high-speed wire cones, and will not cause damage to the workpiece and scrap the workpiece.
11. Use an acetylene flame or torch to anneal the tap, and then use a drill to drill. At this moment, the diameter of the drill should be smaller than the diameter of the bottom hole. The hole should also be aligned to the center to avoid damaging the thread. Use square wrench to screw out the tap.
12. Use a gas drill to take it back. It all depends on the feel. Because the tap is not directly drilled, but with a slow speed and a little friction (similar to a semi-linked car), the tap is turned out.
13. It is possible to use a grinder to smooth the broken wire, then use a small drill bit to drill first, and then gradually use a larger drill bit, the broken wire will gradually fall, and after the fall, use the original specification tap to tap the teeth from the beginning. This has the advantage that it is not necessary to increase the pore size.
14. Weld an iron rod on the fault and then unscrew it. (Defects: a. Too small broken objects cannot be welded; b. Extremely high welding skills are required, and the workpiece is simply burned; c. The welding is simply broken, and the probability of removing the broken objects is very small.)
15. Pry with a cone-shaped thing that is harder than a tap. (Defects: a. It is only suitable for brittle taps. Break the taps and then gradually remove them; b. The taps are too deep and too small to be removed; c. The original holes are easily damaged.)
16. Make a hexagonal electrode with a diameter smaller than the diameter of the tap. Use an EDM machine to machine a hexagonal countersink in the tap, and then use an Allen wrench to screw it out. (Defects: a. Not useful for rusted or stuck taps; b. Not useful for large workpieces; c. Not useful for too small taps; d. Time consuming and laborious.)
17. Directly use electrodes smaller than the tap and hit with an EDM machine. (Defects: a. It is useless for large workpieces and cannot be placed in the EDM machine workbench; b. It is time consuming; c. It is simple to deposit carbon when it is too deep and cannot be beaten.)
18. Hit with an alloy drill (Defects: a. Simple damage to the original hole; b. Not useful for hard breaks; c. Alloy drills are brittle and easy to break.)
19. Now there is a portable east-west machine that is planned and manufactured based on the principle of electrical processing, which can easily and quickly take out broken screws and broken tap drill bits.
20. If the screw is not too hard, you can flatten the end face, and then find the center point, punch a small point with the sample, use a smaller drill to drill first, straighten, and then reverse the screw with the broken wire remover Just out.
21. If you ca n’t buy a broken wire extractor, use a larger drill to continuously expand the hole. When the hole is close to the screw, some of the wire will not be able to fall, remove the remaining wire teeth, and then use a tap to trim it from scratch. .
22. If the broken wire of the screw is exposed, or the requirements of the broken screw are not strict, there is also a hand saw that can be sawed, a saw blade can be sewn, and even the shell is also sawed, and then removed 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 an extended T-shaped rod on the screw, so that it can be easily unscrewed from the welded rod.
24. If the rust of the screw is very severe, and the above method is not good enough, it is advisable to add a little lubricating oil after roasting with fire, and then use the corresponding method above.
25. After more efforts through N, although the screw is taken out, but the hole is also discarded at this time, simply drill a larger hole and tap. If the original screw's orientation and size are constrained, it can also be punched larger. If the screw is in, maybe tap directly and then drill a small hole in the center of the big screw to tap. However, the internal metal structure behind the welding body is sometimes difficult to tap.
