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A lower cone forming tool and method for double-taper bushings for interference-drawing nails

A forming tool and double-taper technology, which is applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of thin-walled bushings, such as forming instability, poor quality, and unqualified dimensions, so as to solve the problem of forming instability and improve Fatigue life and effect of improving machining accuracy

Active Publication Date: 2019-07-09
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the present invention: In order to meet the needs of actual use and process qualified double-tapered interference bushings, design a lower cone forming tool and method for interference-drawing double-tapered bushings to achieve 100° countersunk or flat-headed thin-walled interference The forming of the lower cone of the bush solves the problems of thin-walled bush forming instability, poor quality and unqualified size, and improves the quality consistency of riveting

Method used

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  • A lower cone forming tool and method for double-taper bushings for interference-drawing nails
  • A lower cone forming tool and method for double-taper bushings for interference-drawing nails
  • A lower cone forming tool and method for double-taper bushings for interference-drawing nails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Taking the lower taper forming of the double-tapered bushing with -5 specification interference pulling nails as an example, it can be realized through the following steps:

[0045] Step 1: Commissioning equipment includes feeding mechanism, lower cone forming mechanism and unloading mechanism, select -5 specification lower cone forming mold, clamp the inner cavity surface pressure head of double taper bushing on the equipment, double taper bushing The sleeve blank is loaded into the mold through the feeding mechanism.

[0046] The second step: adjust the lower cone forming mechanism, firstly fix the guide sleeve 5, and successively install the lower cone die 6 and the double-taper bush outer surface interlayer sleeve 4 into the guide sleeve 5.

[0047] Step 3: withdraw the top 71 of the unloading mechanism to a position flush with the lower end surface of the lower cone die 6 .

[0048] Step 4: Adjust the pressure head 1 of the inner cavity of the double-tapered bush ...

Embodiment 2

[0055] Taking the lower taper forming of the double-taper bushing with -6 specification interference pulling nails as an example, it can be realized through the following steps:

[0056] Step 1: Commissioning equipment includes feeding mechanism, lower cone forming mechanism and unloading mechanism, select -6 specification lower cone forming mold, clamp the inner cavity surface pressure head of double taper bushing on the equipment, double taper bushing The sleeve blank is loaded into the mold through the feeding mechanism.

[0057] The second step: adjust the lower cone forming mechanism, firstly fix the guide sleeve 5, and successively install the lower cone die 6 and the double-taper bush outer surface interlayer sleeve 4 into the guide sleeve 5.

[0058] Step 3: withdraw the upper end surface 71 of the unloading mechanism to a position flush with the lower end surface of the lower cone die 6 .

[0059] Step 4: Adjust the pressure head 1 of the inner cavity of the double-t...

Embodiment 3

[0066] Taking the lower taper forming of the double-taper bushing with -8 specifications as an example, it can be realized through the following steps:

[0067] Step 1: Commissioning equipment includes feeding mechanism, lower cone forming mechanism and unloading mechanism, select -8 specification lower cone forming mold, clamp the inner cavity surface pressure head of double taper bushing on the equipment, double taper bushing The sleeve blank is loaded into the mold through the feeding mechanism.

[0068] The second step: adjust the lower cone forming mechanism, firstly fix the guide sleeve 5, and successively install the lower cone die 6 and the double-taper bush outer surface interlayer sleeve 4 into the guide sleeve 5.

[0069] Step 3: withdraw the upper end surface 71 of the discharge rod to a position flush with the lower end surface of the lower cone die 6 .

[0070] Step 4: Adjust the pressure head 1 of the inner cavity of the double-tapered bush to keep it coaxial w...

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Abstract

The invention discloses a lower cone forming tool and method for an intervention nail pulling dual-taper bush. The forming tool comprises a feeding mechanism, a lower cone forming mechanism and an unloading mechanism; the automatic feeding mechanism comprises a workpiece (91), a material guiding groove (92) and a vibration material disc (93); the lower cone forming mechanism comprises an inner cavity molded surface pressure head (1) of the dual-taper bush, a blank (2) of the dual-taper bush, an outer molded surface interlayer cover (4) of the dual-taper bush, a guide cover (5) and a lower conefemale die (6); and the unloading mechanism is an unloading rod (7). According to the lower cone forming tool and method, a whole set of combined forming tool is designed, the size of a molding die cavity is precisely controlled, the match between sizes of the die and the workpiece is realized, the instability of the workpiece is limited by inner and outer molded surfaces of the die, a sectionalcombined die is adopted, the lower cone is formed in a forming manner of limiting and necking down, the formation of the lower cone of a 100-degree countersunk head or flat head thin-wall interventionbush is met, and the lower cone forming tool can be used for precisely controlling an intervention connection structure of a plane composite material with precise interference amount.

Description

technical field [0001] The invention belongs to the technical field of forming thin-walled bushes of nail-pulling fasteners, and relates to a lower cone forming tool and method for thin-walled bushes. Background technique [0002] The interference screw fastening system is mainly used for the installation of composite material structures. Due to the introduction of interference bushings, the interference installation of composite materials can be realized and the fatigue resistance can be improved. For the closed part of the aircraft structure, it can be installed on one side, and it can also be installed on a 7° slope structure. It has good reliability and is widely used in the connection of aircraft body, wing and other structures. The double taper bushing is the key component of the interference screw fastening system. The upper taper of the interference bushing is a countersunk head, and the lower taper at the tail is a 40° taper angle. During the installation process o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D41/04B21D37/12B21D45/02
CPCB21D37/12B21D41/04B21D45/02
Inventor 黄宏刘风雷赵庆云梁福顺
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST