How To Improve Bolt Coupling Strength?

1. Improve thread distribution of load between using common nut

, axial load in the spin and thread each circle is the distribution of between uneven, from not supporting surface, count by the largest first lap, each lap after declining. Theoretical analysis and experiments, spin and the more laps, the load distribution uneven degree and the more significant, to 8 ~ 10 lap later, thread almost not by the load. So, the lap of the more thick nut, and can't improve the connection strength. If you use a figure 15.13 B's Mount (tensile) nuts, the nuts and bolts for mounting conical pole are stretching deformation, helps to reduce the nuts and bolts of the screw pole change moment is poor, so that the load distribution is evener. Ring groove nuts, and its function and mount nut similar.

2. Avoid or reduce additional stress due to design, manufacture or negligence of the installation can make bolts are subject to additional bending stress, the fatigue strength of bolts impact, should try to avoid. For example, in casting or forging not processing on the surface and installation bolt, often USES convex platform or heavy head block structure, can be obtained by cutting processing after the formation of the bearing surface. Reduce stress concentration of threads, bolt head and bolt root pole junction, all have stress concentration, is a dangerous part of the fracture. The stress concentration is at the root of thread on the bolts fatigue strength of the influence. Can take root fillet radius increased the thread, head of the bolt transition increase cutting or unload groove fillet of measures to reduce the stress concentration. Reduce stress amplitude bolt the maximum stress must, stress amplitude is smaller, the higher the fatigue strength. For the working load and residual pre-tightening force under the condition of invariable, reduce the bolt stiffness or increase the stiffness of a linked to reduce stress amplitude purpose, but pre-tightening force should be increased.

Reduce the bolt stiffness measures are: appropriate increase the length of the bolt; Part of the bolt diameter rod may reduce or hollow structure, flexible bolt. The elastic element installed in nuts, also can have the effect of flexible bolts. Flexible bolts while loading large deformation, absorb energy effect is strong, be also suitable for rear impact and vibration. In order to increase the stiffness of the linked system, should not use stiffness small washers. As showed in the seal connection with sealing ring is preferred. Improve manufacturing process manufacturing process to bolt the fatigue strength has a very big effect. For high strength steel bolts, more significant. The rolling thread system, due to cold hardening of the role, the surface has residual stress, metal reasonable streamline, bolt fatigue strength of then turning high. Carbon and nitrogen were permeability, nitriding, shot peening treatment can improve the fatigue strength bolt.

by: becky

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