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A multi-slit bush diameter variable device with threaded sleeve and its application method

A technology of slotted bushing and threaded sleeve, applied in the direction of threaded fasteners, nuts, connecting components, etc., can solve the problems affecting the cold extrusion strengthening process of holes, etc., to increase service life, reduce wear, and achieve multiple effect used

Active Publication Date: 2022-04-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the extrusion force is too large, the multi-slit bushing will be damaged, and the hole cold extrusion strengthening process cannot be carried out smoothly. The front end of the slotted bush cannot be smoothly installed in the assembly hole of the extruded workpiece, which affects the smooth progress of the hole cold extrusion strengthening process

Method used

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  • A multi-slit bush diameter variable device with threaded sleeve and its application method
  • A multi-slit bush diameter variable device with threaded sleeve and its application method
  • A multi-slit bush diameter variable device with threaded sleeve and its application method

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Embodiment 1

[0028] refer to figure 1 As shown, a multi-slit bush diameter variable device with a threaded sleeve and its use method include a rotary handle 1; a threaded sleeve 2; a multi-slit bush 3, wherein the rotary handle 1 is installed on the threaded sleeve 2, The threaded sleeve with the rotary handle is mounted on the middle part 5 of the multi-slit bush, and the middle part 5 of the multi-slit bush has a taper angle and has threads.

[0029] Turn the rotary handle 1, and the threaded sleeve 2 gradually moves from the middle part 5 of the multi-slit bushing to the tail part 6 of the bushing. During the process, the width of the slit on the multi-slit bushing 3 begins to narrow gradually, causing the front end 4 of the multi-slit bushing to The diameter decreases; turn the rotary handle 1 counterclockwise, the threaded sleeve 2 gradually moves from the middle part 5 of the multi-slit bushing to the front end 4 of the bushing, and the width of the slit on the multi-slit bushing 3 r...

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Abstract

The invention proposes a multi-slit bush diameter variable device with a threaded sleeve and its use method. The bushing is tapered and threaded in the middle. Turn the rotating handle, and the slot width on the multi-slit bush will gradually narrow during the process of moving the threaded sleeve from the middle of the multi-slit bush to the bush tail, causing the diameter of the front end of the multi-slit bush to decrease; Turn the rotary handle clockwise, the threaded sleeve gradually moves from the middle of the multi-slit bushing to the front end of the bushing, and the width of the slits on the multi-slit bushing returns to the original width. By turning the rotary handle clockwise or counterclockwise, the diameter of the front end of the multi-slit bushing can be freely changed. The invention is simple in structure and easy to operate, and can change the diameter of the front end of the multi-slit bush, thereby smoothly realizing the cold extrusion strengthening process of the multi-slit bush hole.

Description

technical field [0001] The invention relates to a multi-slit bush diameter variable device with a threaded sleeve and a method for using the same, which belong to the technical field of hole cold extrusion intensified precision machining, and in particular relate to changing the diameter of a multi-slit bush by using a threaded sleeve. Background technique [0002] There are many structural parts on the wide-body airliner, and the structural parts are assembled by installing fasteners in the assembly holes. Due to the existence of assembly holes on structural parts, it is easy to form stress concentration at the edge of the assembly hole of structural parts. Stress concentration is easy to cause fatigue crack initiation and increase the rate of fatigue crack growth, thereby reducing the fatigue strength of structural parts with holes and delaying the fatigue of structures with holes. service life of the parts. [0003] Hole cold extrusion strengthening technology changes th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B37/00
CPCF16B37/00
Inventor 杨长勇梁勇楠刘飞苏宏华丁文锋徐九华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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