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Blind rivet type thin-wall bush with countersunk head and forming method of thin-wall bush

A countersunk head and bushing technology, which is applied in the field of thin-walled bushings with countersunk head nails and its forming, can solve the problem of being unable to manufacture thin-walled bushings that require high-precision interference installation and connection, which affects the precise control of interference and accumulation Problems such as excess metal can be solved to improve product forming quality, prevent instability and deformation, and improve product quality.

Active Publication Date: 2018-04-03
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper control of the traditional stamping method is prone to cracking of the angle surface, and excessive metal accumulation or instability occurs in the fillet under the head, and the bending instability of the cylinder wall diameter affects the precise control of the interference amount, which can easily lead to product scrapping and cannot be manufactured. Thin-walled bushings that meet the needs of high-precision interference-mounted connections

Method used

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  • Blind rivet type thin-wall bush with countersunk head and forming method of thin-wall bush
  • Blind rivet type thin-wall bush with countersunk head and forming method of thin-wall bush
  • Blind rivet type thin-wall bush with countersunk head and forming method of thin-wall bush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A thin-walled bushing with a countersunk head, including a base 1, a bushing 2, a male die 3 and a pressure-relief sleeve 5, the male die 3 is arranged on the base 1, and the base 1 and the male die 3 are A bushing 2 is provided, the pressure relief sleeve 5 is arranged on the upper side of the male mold 3, a spring 4 is provided between the male mold 3 and the pressure relief sleeve 5, and the base 1 includes a countersunk profile 12 and a central axis 14. The central axis 14 is set vertically upward at the center of the countersunk profile 12, the top of the central axis 14 is chamfered 15, and the connection between the central axis 14 and the countersunk profile 12 is a circle Angle 13 structure, the bushing 2 includes a bushing pipe outer wall 23 and a bushing pipe inner wall 26, the top and center of the bushing pipe outer wall 26 are provided with a bushing countersunk head outer angle surface 21 and a countersunk head outer rounded corner 22, the top and center ...

Embodiment 2

[0051]A thin-walled bushing with a countersunk head, including a base 1, a bushing 2, a male die 3 and a pressure-relief sleeve 5, the male die 3 is arranged on the base 1, and the base 1 and the male die 3 are A bushing 2 is provided, the pressure relief sleeve 5 is arranged on the upper side of the male mold 3, a spring 4 is provided between the male mold 3 and the pressure relief sleeve 5, and the base 1 includes a countersunk profile 12 and a central axis 14. The central axis 14 is set vertically upward at the center of the countersunk profile 12, the top of the central axis 14 is chamfered 15, and the connection between the central axis 14 and the countersunk profile 12 is a circle Angle 13 structure, the bushing 2 includes a bushing pipe outer wall 23 and a bushing pipe inner wall 26, the top and center of the bushing pipe outer wall 26 are provided with a bushing countersunk head outer angle surface 21 and a countersunk head outer rounded corner 22, the top and center o...

Embodiment 3

[0067] A thin-walled bushing with a countersunk head, including a base 1, a bushing 2, a male die 3 and a pressure-relief sleeve 5, the male die 3 is arranged on the base 1, and the base 1 and the male die 3 are A bushing 2 is provided, the pressure relief sleeve 5 is arranged on the upper side of the male mold 3, a spring 4 is provided between the male mold 3 and the pressure relief sleeve 5, and the base 1 includes a countersunk profile 12 and a central axis 14. The central axis 14 is set vertically upward at the center of the countersunk profile 12, the top of the central axis 14 is chamfered 15, and the connection between the central axis 14 and the countersunk profile 12 is a circle Angle 13 structure, the bushing 2 includes a bushing pipe outer wall 23 and a bushing pipe inner wall 26, the top and center of the bushing pipe outer wall 26 are provided with a bushing countersunk head outer angle surface 21 and a countersunk head outer rounded corner 22, the top and center ...

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Abstract

The invention discloses a blind rivet type thin-wall bush with a countersunk head and a forming method of the thin-wall bush. Main points of the technology are that the thin-wall bush includes a bottom seat, a bush, a male mold and a back pressure sleeve. The male mold is arranged on the bottom seat. The bush is arranged between the bottom seat and the male mold. The back pressure sleeve is arranged on the upper side of the male mold. A spring is arranged between the male mold and the back pressure sleeve. The forming method includes the steps of (1), fixing,(2), arrangement of a thin-wall tube stock and a central shaft, (3), arrangement of a spring sleeve and a pushing pipe,(4), arrangement of a pushing sleeve and the male mold, (5), forming of a bush countersunk head, (6), external constraint removing, and (7), forming of a countersunk head bush. The thin-wall bush has the advantages that product forming quality is improved; product dimensional precision is improved; instability anddeformation of the inner diameter and internal round corners of the bush are prevented; instability is avoided; the product quality is effectively improved accordingly; and market prospects are vast.

Description

technical field [0001] The invention belongs to the technical field of forming a thin-walled bush of a nail-like fastener, more specifically, the invention relates to a thin-walled bush with a countersunk head and a forming method thereof. Background technique [0002] Pull nail fasteners can be installed on one side and can also be installed on a 7° slope structure, and have good reliability. They are widely used in the connection of aircraft fuselages, wings and other structures. The thin-walled bushing is one of the components of the countersunk screw fastening system, which can be used for interference connection of composite materials and improve the fatigue life of the structure. The minimum wall thickness of the bushing is only 0.25mm. This kind of thin-walled pipe structure is prone to instability when the 100° countersunk head is formed by the traditional stamping method, which cannot meet the actual use requirements. The invention adopts the closed forming method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/10B21D22/02
CPCB21D22/025B21D37/10
Inventor 刘风雷赵庆云黄宏
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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