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Special bolt requirements for high-frequency rear shaft holes and drum tooth couplings for gear couplings

Description:
Under normal operation, the internal and external teeth of the coupling can be matched to maximize the torque of the coupling, that is, the coupling bolt reaches the required 8.8 grade of the twisted hole bolt, the basic size between the ordinary bolt screw part diameter and its hole is generally different,(the general hole size is 0.5~1 mm larger than the bolt size), so it can not be called the match. It relies on the pre-tightening force of the bolt to prevent the relative sliding and movement of the connected parts. When there is relative sliding between the connected parts, the preloading force is converted into friction to prevent its movement, so a large preloading force is required.

Special bolt requirements for high-frequency rear shaft hole and drum type tooth coupling:
The gear coupling needs high-frequency tempering treatment, because the high-frequency treatment needs higher temperature, it will be heated and deformed. Axle hole tolerances will become negative due to thermal expansion and contraction. Therefore, high frequency treatment of the coupling is heated to the specified temperature in the heating furnace, and the workpiece temperature is detected. Take out the coupling and turn over, put it in the furnace to continue heating. Such as heating large couplings with wood. After 2 ~ 3h, the aperture is repeatedly measured with the measuring rod until the large measuring rod can freely enter the coupling hole, and the heating can be ended. Lift out the coupling and install the impact plate, lift or other set of tools. Correct the position so that the coupling hole is vertical (when set vertically) or horizontal (when set horizontally), and clean the coupling hole so that the inner hole is free of debris. Lift the coupling close to the rotating shaft; Check the inner hole size again to see if there is a required assembly gap. If the measuring rod can pass, the set can be carried out. Apply oil evenly to the mating surface of the shaft.

Conclusion:
The drum tooth coupling bolt is not an ordinary high-strength bolt, the hardness and material requirements of the bolt need to meet the standard in order to make the coupling play a large torque requirement. Its name is called the twisted hole bolt, which needs to be processed by the grinder. The hole bolt is made according to the standard GB/T27-1988 and the standard GB/T28-1988 with the hole bolt: The diameter of the hinge Ds is 1MM larger than the thread, (below M30). The larger ones are 2MM larger. This tolerance standard is h9. And are negative tolerances. According to the provisions of ream hole bolt diameter Ds can also press m6; u8 tolerance brings production. However, it is necessary to add extra marks when marking: for example, bolt GB/T27 M16Xm6X60 (to add m6 words) can not be marked normally.
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