Analysis of the improvement of new mill parts

The eclipse is developed by pitting corrosion, and the cause of pitting is mainly due to the lack of smoothness of the tooth surface and excessive stress on the tooth surface, which causes the material to be partially weakened, resulting in cracks, spreading to the surface and gradually becoming pitting. damage. The large layer of the surface is crushed and peeled off. The smoother the contact surface, the closer the contact stress is to the uniform distribution, and the higher the contact fatigue life. To this end, we have increased the surface roughness of the original tooth-toothed working surface from 'sub-to' to make the contact stress evenly distributed, eliminating the phenomenon of excessive local stress.
Improve machining accuracy as the most dangerous failure mode of the gear teeth, except for the impact of excessive impact during production, long-term AC stress, the movement between the gears caused by the non-co-entanglement of the gear teeth The load is also an important cause of the broken teeth. The non-co-entanglement of the gear teeth is mainly caused by the base section error of the gear and the tooth profile error. Therefore, the machining accuracy level of the gear teeth should be increased as much as possible.
The manufacturer is required to use the grinding process to run the gears produced, and at the same time to modify the tooth profile of the gear to ensure the machining accuracy. According to the actual situation, this improvement has achieved good results.
Increasing the surface hardness The wear resistance of the gear friction pair is related to the hardness of the material. After the original tooth shaft is quenched and tempered, it is in between. However, the improved torsion quenching hardness is improved to a part of the intermediate gear such as the local contact stress, and the local hardening treatment is performed. To this end, we use surface hardening to achieve a surface hardness of one.
By increasing the surface hardness, not only the wear is reduced, but also the bending resistance is also improved. However, due to manufacturing errors and installation errors during actual use, the upper, middle and lower three pinions cannot achieve the desired meshing requirements. The gear shaft assembly before the improvement is axially swayed, and due to the limitation of the thrust surface of the bearing bush, all axial load is applied to one of the upper and lower two pinion shafts, so that the bearing load is too large, causing the bearing bush to be overloaded. The temperature of the tile is too high, and even the phenomenon of burning tiles is shown in the figure. After accurate calculation, we reduce the axial length of the upper and lower passive gear shaft surfaces to a proper reduction, which is shortened from the original, thus increasing the clearance between the thrust surface thrust surface and the thrust surface of the bearing bush.

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