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A tool for machining precision thin-walled bushings

A bushing and thin-walled technology, which is applied in the field of tooling for processing precision thin-walled bushings, can solve problems such as improper process methods, easy deformation of pipes, and easy cracking of the head, so as to meet the requirements of dimensional accuracy, ensure stability and consistency, The effect of ensuring dimensional accuracy

Active Publication Date: 2021-10-29
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-precision machining of thin-walled bushings used in interference connections is extremely important, and improper process methods often produce waste products such as instability and deformation.
[0003] In the prior art, the processing of thin-walled bushings is formed by rolling and riveting pipes. After flaring, metal accumulation occurs under the bushing head, and the fillet at the joint between the bushing head and the rod is unstable, which cannot meet the actual use requirements, and the pipe is easy to Deformation, resulting in size out of tolerance, the head is also easy to crack, causing the product to be scrapped

Method used

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  • A tool for machining precision thin-walled bushings
  • A tool for machining precision thin-walled bushings
  • A tool for machining precision thin-walled bushings

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0040] Specific embodiment 1: machining a bushing 5 with an inner diameter d of φ8mm, the taper A of the inner hole of the bushing 5 is 1.2°±0.05°, the wall thickness T of the bushing 5 is 0.20mm, and the taper length is 11mm.

[0041] During the clamping process, the outer end surface of the head of the bushing 5 is in contact with the inner wall of the countersunk head 11 of the mounting hole, that is, figure 2 The outer end surface of the countersunk head surface B of the bushing 5 is in contact with the inner wall surface of the countersunk head 11 of the mounting hole, the outer wall surface of the inner hole of the bushing 5 is in contact with the inner wall surface of the inner hole of the clamping hole, and the outer fillet of the bushing 5 is in contact with the inner wall surface of the mounting hole. The fillet 12 in the hole is in contact, that is figure 2 The outer fillet R at the connection between the head and the tail of the bushing 5 is in contact with the i...

specific Embodiment 2

[0044] Specific embodiment 2: processing the bushing 5 whose internal diameter d of the bushing 5 is φ7.6mm, the taper A of the inner hole of the bushing 5 is 0°, that is, the straight wall bushing 5, the wall thickness T of the bushing 5 is 0.20mm, and the length is 11mm.

[0045] During the clamping process, the outer end surface of the head of the bushing 5 is in contact with the inner wall of the countersunk head 11 of the mounting hole, that is, figure 2 The outer end surface of the countersunk head surface B of the bushing 5 is in contact with the inner wall surface of the countersunk head 11 of the mounting hole, the outer wall surface of the inner hole of the bushing 5 is in contact with the inner wall surface of the inner hole of the clamping hole, and the outer fillet of the bushing 5 is in contact with the inner wall surface of the mounting hole. The fillet 12 in the hole is in contact, that is figure 2 The outer fillet R at the connection between the head and th...

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Abstract

The invention relates to a tool for machining precision thin-wall bushings. It includes an elastic ferrule, which is used to clamp the thin-walled bush; an outer jacket, which is set outside the elastic ferrule, and is used for clamping and guiding the elastic ferrule; the elastic ferrule includes an upper clamping part and The guide part is located at the lower end of the clamping part. There is a clamping hole inside the clamping part for placing the thin-walled bush and the axis of the clamping hole coincides with the axis of the thin-walled bush. The outer surface of the clamping part is gradually dimensioned along the X direction. Reduced outer tapered surface; the inside of the guide part is provided with a first guide hole, and a pull rod for pulling the elastic ferrule to move in the X direction is pierced in the first guide hole; the upper end of the outer sleeve is provided with a dimension along the X direction With the gradually reduced inner tapered surface, the invention can avoid the deformation of the bushing, and the use of an integral compound forming tool can ensure the stability and consistency of the inner wall size.

Description

technical field [0001] The invention relates to the technical field of machining mechanical connectors, in particular to a tool for machining precision thin-walled bushings. Background technique [0002] In order to meet the long-life connection requirements of aircraft, interference connection technology is usually used to improve the fatigue strength. In the interference installation process, for bolts with a diameter above 8mm to achieve a large amount of interference, the required pressing force is large, and the actual operation is difficult and cannot be satisfied. Due to the application requirements, the bushing should be used as the interference connection carrier. Using the fastening system with the inner cone bushing can greatly reduce the interference installation stroke and installation pressing force. For composite structures, it can also avoid interference connection delamination, and at the same time, it can play a role To the protective effect of electric con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q3/00B23P13/00
CPCB23P13/00B23Q3/00B23Q2703/10
Inventor 黄宏赵庆云
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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