High anti-fatigue bolt and manufacturing method thereof

Abstract

The invention discloses a manufacturing method of a high anti-fatigue bolt. The manufacturing method comprises the following steps: a bolt provided with a head part, a rod part and a thread section is machined by adopting a tampering forming method, when threads of the thread section are machined, firstly a transition section is machined on the rod part, and positioned between the thread section and the rod part, the maximum diameter of the transition section is smaller than the outer diameter of the thread of the thread section and the diameter of the rod part, threads with needed standard thread pitch are rolled on the thread section by adopting a thread rolling wheel, when the threads are rolled, ending threads at a position where the thread section and the transition section are connected are of incomplete threads, namely the thread pitch of the ending threads is smaller than or equal to half of the standard thread pitch on the thread section. The bolt has the advantages of being high in anti-fatigue strength, small in size and light in weight, and the manufacturing method has the advantages of being simple in technology, lower in manufacturing cost, fast to produce, high in working safety and reliability, convenient to both use and maintain and the like.

Description

technical field [0001] The invention relates to a high-fatigue-resistant bolt and a manufacturing method thereof, belonging to the technical field of fasteners. Background technique [0002] In the design of aerospace parts, it is well known in the field of fastener technology that high-performance fasteners are very expensive and that their weight is one of the most critical parameters. For example, some magazines say that "every additional 450g of weight added to the aircraft is equivalent to increasing the operating cost of the aircraft for one year"; "Work hard to reduce every gram of weight". On aerospace vehicles, excess weight is not acceptable. In order to achieve the purpose of reducing the bolt weight, the bolt size is often reduced as much as possible to reduce the bolt weight. However, the fastener bolts manufactured by the existing ordinary processing method and the existing bolt structure often cannot meet the requirements in terms of fatigue resistance under...

AI Technical Summary

Problems solved by technology

However, the fastener bolts manufactured by the existing ordinary processing method and the existing bolt structure often cannot meet the requirements in terms of fatigue resistance under the required size. Due to its poor fatigue resistance, it often causes aerospace The flight safety factor of the aircraft is low and the maintenance cost is high

Therefore existing bolt structure or manufacturing method are not ideal enough yet.

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