Ways to improve the fatigue strength of crusher spindle

In the design phase of the part, in addition to taking general measures to improve its strength, some of the following design measures can be taken to improve its fatigue strength:

1. Reduce the effect of stress concentration on this spindle as much as possible. This is the primary measure and the main way to improve its fatigue strength. Therefore, in order to reduce the stress concentration, the abrupt changes in the structural shape and size of the part (i.e. the spindle) should be minimized so that the changes are as smooth and uniform as possible. To this end, the radius of the corner of the transition should be increased as much as possible; the change in rigidity of adjacent sections on the same shaft should be as small as possible, etc. In the unavoidable to produce a large stress concentration of the structure, can be used to reduce the impact of stress concentration of load reduction tank.

2. Choose materials with high fatigue strength and specify heat treatment and strengthening process that can improve fatigue strength of materials.

3. Improve the surface quality of the spindle. For example, the surface of the spindle in the high stress area will be machined more smoothly. Or, if there are shaft sections that work in corrosive media, specify appropriate surface protection for the shaft section.

4. Minimizing or eliminating the size of the initial cracks that may occur on the spindle surface has a more significant effect on extending its fatigue life and improving material properties. Therefore, for important shaft sections, strict inspection methods and requirements should be specified in the design drawings.

5. Temperature reduction, load reduction, for the hot frictional journals to take the cooling design, can also significantly improve its fatigue life. Because the spindle is a rotating part, so, after a certain number of weeks of operation under low stress, and then gradually increase to the designed stress level. Because bearings, especially some commonly used bearings, mainly some rolling bearings, the vast majority of them have been standardized, thus, we need to carry out part of the design content, according to the specific working conditions, the correct choice of bearing type and size. In addition is the design of the bearing combination, which includes the design of a series of content such as installation, adjustment, lubrication, sealing, etc.

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