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A short end threaded fastener

A threaded fastener and thread technology, applied in the field of aerospace fastener manufacturing, can solve problems such as high risk, high cost, and complicated processing process, and achieve the effects of avoiding damage to polished rods, reducing overall weight, and simple processing process

Active Publication Date: 2020-12-11
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first type of processing, because of the common thread structure, in order to achieve the thread ending of 1.5P, it has to process a small transitional arc that exceeds the standard requirements. This arc will undoubtedly cause the need to exceed the installation process during installation. The installation force required by the specification, excessive installation force may cause structural damage
[0008] The second type of processing, the processing process is complicated, it needs pre-turning finishing groove, finishing groove strengthening process, and the polished rod after strengthening will affect the transition arc processing, and it is easy to cause far exceeding the standard regulations due to strengthening reasons during thread rolling. The thread folds and cracks are generated, the cost is high and the risk is high

Method used

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  • A short end threaded fastener
  • A short end threaded fastener
  • A short end threaded fastener

Examples

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Effect test

Embodiment 1

[0023] figure 1 It is a schematic diagram of a short end threaded fastener of the present invention. combine 1 and figure 2 As shown, the fastener includes a threaded portion and a polished rod portion, and the threaded portion further includes a thread working area and a thread ending area, wherein the length of the thread working area is much larger than the thread ending area, and the thread ending area transitions to the polished stem portion, along the thread The ending transition end face of the trend is an arc ending end face, the pitch of the thread ending area and the thread working area is P, and the radius of the arc ending end face is R, where R≥P / 2.

Embodiment 2

[0025] combine 1 and image 3 As shown, a short-finished threaded fastener includes a threaded portion and a polished stem portion, and the threaded portion further includes a threaded working area and a threaded ending area, wherein the length of the threaded working area is much greater than the thread ending area, from the thread The ending area transitions to the polished rod part. The ending transition end face along the thread direction is an arc ending end face. 2. Along the axial direction of the threaded fastener, the transition shaft section from the polished rod part to the thread ending area is a tapered arc conical shaft section, and the axial length of the tapered arc conical shaft section is L. Suppose the length of the thread ending area is S, and its calculation formula is: S=L+K+X, where K is a fixed value related to the thread profile, and X is the incomplete thread of the thread ending area in the axial direction. length.

[0026] Further, the length X of...

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Abstract

The invention relates to a short ending threaded fastener. The fastener comprises a thread part and a polished rod part, and is characterized in that the thread part comprises a thread working area and a thread ending area, the thread working area is much longer than the thread ending area and is a bolt working bearing area, transition is from the thread ending area to the polished rod part, an ending transition end face in the thread direction is a circular arc ending end face, the thread pitch of the thread ending area and the thread pitch of the thread working area are P, the radius of thecircular arc ending end face is R, and R is equal to or greater than P / 2. By designing the short thread ending area, a thread is quickly transitioned from the working area with a complete thread formto the polished rod part, the ending lead of the thread is shortened, the total length of thread ending is reduced, the thread ending length can be controlled within 1.5P under the condition of realizing the working performance of the fastener, the overall length of the fastener can be reduced, and thus the overall weight of the fastener is reduced. The processing method of the fastener is simplerand more reliable.

Description

technical field [0001] The invention relates to the technical field of aviation fastener manufacturing, in particular to a short end thread fastener. Background technique [0002] In the aviation field, it is very important to reduce the weight of parts, and an aircraft uses hundreds of thousands of fasteners, and the weight reduction of the fasteners itself is very significant for the weight reduction of the body. [0003] With the improvement of the service life of the new aircraft body, the fasteners are installed with interference fit, and the interference fit installation requires the processing of a certain standard of transition arcs at the entry hole of the polished rod of the fastener to ensure installation under a certain load. The installation of fixed interference can be realized under the force. The arc transition area is also the ending area in the use of threaded installation, and it is also included in the calculation of the ending length of 1.5P. After the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B35/04F16B33/02
CPCF16B33/02F16B35/041
Inventor 李伟强
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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