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Shape memory alloy interference fit thread connection assembly

A memory alloy, interference fit technology, applied in the direction of connecting components, threaded fasteners, screws, etc., can solve the problems of small interference, bulge, uneven interference, etc., to achieve large material recovery force and reliable anti-loosening effect. , to avoid the effect of uneven amount of interference

Inactive Publication Date: 2018-01-12
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems, the present invention proposes a shape memory that can effectively solve the shortcomings of ordinary interference fit bolts such as small interference, uneven interference, and protrusions in the connection process, and at the same time effectively prevent the bolted components from loosening under load. Alloy interference fit threaded components

Method used

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  • Shape memory alloy interference fit thread connection assembly
  • Shape memory alloy interference fit thread connection assembly
  • Shape memory alloy interference fit thread connection assembly

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Embodiment Construction

[0019] The present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some implementation cases recorded in the present invention. For those of ordinary skill in the art, other Attached.

[0020] like figure 1 and figure 2 As shown, a shape memory alloy interference fit screwing assembly includes: a shape memory alloy bolt 1 and a shape memory alloy nut 2 threadedly matched with the shape memory alloy bolt;

[0021] The shape memory alloy bolt 1 includes a bolt head 1-1 in contact with the connected part; a smooth rod part 1-2 in interference fit with the connected smooth hole (referring to the connection through hole preset by the connected part); and a nut thread Threaded parts 1-3 of the connection. The structure of the shape memory alloy nut 2 includes an inner screw hole connected with the threaded portion of the shape memory alloy bolt and an outer...

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Abstract

The invention discloses a shape memory alloy interference fit thread connection assembly comprising a shape memory alloy bolt and a shape memory alloy nut which is in thread fit with the shape memoryalloy bolt. Standard external threads are machined on a stretched pre-deformed bolt blank. Standard internal threads connected with the bolt are machined in a reamed pre-deformed nut blank. After thethread connection assembly and connected pieces are assembled, the whole is heated, shape memory alloy bolt is heated and recovers, the length of the bolt is reduced, the diameter of the bolt is evenly increased, and the bolt forms uniform interference with connected holes, and interference bumps and other defects are avoided; the shape memory alloy nut is heated and recovers, the diameter of thenut is evenly reduced, the nut tightly hoops the bolt, and the phenomenon that the thread connection assembly is loose after working for a long time is prevented.

Description

technical field [0001] The present invention relates to shape memory alloy interference fit screw assemblies. Background technique [0002] Interference connection refers to a connection method in which the diameter of the nail rod after assembly is larger than the hole diameter before assembly. The interference connection is superior to the ordinary connection in terms of fatigue life and sealing. [0003] The bolts usually used for interference connection are titanium alloy high-lock bolts, which have the characteristics of reliable connection, light weight, controllable preload, high fatigue life, etc., and have been widely used in aircraft assembly. A large number of titanium alloy high-lock bolts are used in the connection of the wing panels of the large passenger aircraft C919. The titanium alloy high-lock bolts have the dual effect of reducing the weight of the aircraft and improving the fatigue life. The main shortcomings of the current interference connection, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/22F16B35/00
Inventor 林成新姜东刘志杰
Owner DALIAN MARITIME UNIVERSITY
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