In general, we analyze bolt breaks from the following four aspects:
First, the quality of the bolt is second, the pre-tightening moment of the bolt is third, the strength of the bolt is fourth, and the fatigue strength of the bolt. In fact, most of the bolt breakage is caused by looseness and is broken due to looseness. bad. Because the bolt loosening and the fatigue fracture are almost the same, in the end, we can always find the reason from the fatigue strength. In fact, the fatigue strength is so large that we can't imagine that the bolt will not use the fatigue strength during use.
The looseness of the threaded fastener is not due to the fatigue strength of the bolt:
Threaded fasteners can be loosened only one hundred times in the transverse vibration test, and one million times in the fatigue strength test. In other words, the threaded fastener is loose when using one ten thousandth of its fatigue strength. We only use one ten thousandth of its large capacity, so the looseness of the threaded fastener is not due to the fatigue strength of the bolt. .
The real cause of damage to threaded fasteners is looseness:
When the threaded fastener is loose, it generates a huge kinetic energy mv2. This huge kinetic energy directly acts on the fasteners and equipment, causing the fastener to be damaged. After the fastener is damaged, the equipment cannot work under normal conditions, further causing Equipment damage.
Fasteners that are subjected to axial forces, the threads are broken and the bolts are broken.
For fasteners that are subjected to radial forces, the bolts are sheared and the bolt holes are made elliptical.
The use of a thread-locking method with excellent anti-loose effect is the fundamental solution to the problem:
At present, the most advanced and best-lasting anti-loose method is the Locking method of Down's thread fasteners. The Tang's bolts are used on a four-roll crusher and used on hydraulic breakers. The strength is not increased and the bolts are no longer broken.
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