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A metal thin-walled pipe cold-bending processing filler and its application method

A technology for thin metal, walled tubes, applied in the field of fillers, can solve the problems of complex filling and removal process of rosin fillers, deformation, generation of wrinkle ovality, etc., and achieves the effects of good bending deformation effect, simple bending process and easy removal.

Active Publication Date: 2017-07-14
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metal pipe cold bending processing fillers are mostly rosin and other fillers, which are suitable for materials with large inner diameter and thick pipe wall. Ovality, in addition to complex filling and removal processes for rosin fillers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Measure mass ratio and be 80% disodium hydrogen phosphate heptahydrate (molecular formula Na 2 HPO 4 12H 2 O), 10% sodium dihydrogen phosphate dihydrate (molecular formula NaH 2 PO 4 2H 2 O), 10% sodium phosphate dodecahydrate (molecular formula Na 3 PO 4 12H 2 O); put it into the preparation kettle, after fully mixing, heat to 100°C, keep the constant temperature for 30 minutes after melting, to ensure that the filler is fully melted, and the water should be kept from being lost during heating and constant temperature; the filler should flow into the pipe to be bent, and the bent material Both ends should be filled, and talc powder should be applied to the inner cavity of the pipe to increase the lubrication of the pipe; air-cool the pipe to room temperature, fully cool, and use a pipe bender to bend the pipe.

Embodiment 2

[0019] Measure mass ratio and be 70% disodium hydrogen phosphate dodecahydrate (molecular formula Na 2 HPO 4 12H 2 O), 20% sodium dihydrogen phosphate dihydrate (molecular formula NaH 2 PO 4 2H 2 O), 5% sodium phosphate dodecahydrate (molecular formula Na 3 PO 4 12H 2 O), 5% sodium carbonate monohydrate (molecular formula Na 3 CO 3 1H 2 O); put it into the preparation kettle, after fully mixing, heat to 105°C, keep the constant temperature for 30 minutes after melting, to ensure that the filler is fully melted, and the moisture should not be lost during the heating and constant temperature process; the filler should flow into the pipe to be bent, and the bent material Both ends should be filled, and talc powder should be applied to the inner cavity of the pipe to increase the lubrication of the pipe; air-cool the pipe to room temperature, fully cool, and use a pipe bender to bend the pipe.

Embodiment 3

[0021] Measure mass ratio and be 70% disodium hydrogen phosphate heptahydrate (molecular formula Na 2 HPO 4 ·7H 2 O), 10% sodium dihydrogen phosphate dihydrate (molecular formula NaH 2 PO 4 2H 2 O), 15% sodium phosphate dodecahydrate (molecular formula Na 3 PO 4 12H 2 O), 5% sodium carbonate monohydrate (molecular formula Na 3 CO 3 1H 2 O); put it into the preparation kettle, after fully mixing, heat to 100°C, keep the filler at constant temperature for 30 minutes after melting, to ensure that the filler is fully melted, and the moisture should not be lost during heating and constant temperature; the filler should flow into the pipe to be bent, bend Both ends of the pipe should be filled; air-cool the pipe to room temperature, fully cool, and use a pipe bender to bend the pipe.

[0022] Taking the superalloy GH648 pipe with a specification of Φ5×0.3mm as an example, there is no wrinkle at the bend of the pipe, and the ellipticity of the bend is less than 1mm.

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PUM

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Abstract

The invention relates to a filler, particularly to a metal thin-walled tube cold-bending processing filler and an application method thereof. The technical scheme lies in that the metal thin-walled tube cold-bending processing filler comprises the following components by mass percent: 70%-90% of sodium hydrogen phosphate, 10%-30% of sodium dihydrogen phosphate, 0%-20% of sodium phosphate, 0%-10% of sodium carbonate and a trace amount of talcum powder. According to the metal thin-walled tube cold-bending processing filler and the application method thereof provided by the invention, the metal thin-walled tube cold-bending processing filler is applicable to metal thin-walled tube cold-bending processing, the state of a bent section is not influenced, and the quality of cold-bending processing is guaranteed.

Description

technical field [0001] The invention relates to a filler, in particular to a filler for cold-bending metal thin-walled pipes and an application method thereof. Background technique [0002] With the continuous development of aviation industry technology, the application of metal pipes is becoming more and more extensive, and the wall thickness is getting thinner and thinner. The bending process of metal pipes mostly adopts cold bending processing, which has the advantages of simple processing technology, short processing time and low cost. advantage. However, after cold bending, residual stress and residual strain will occur in the longitudinal direction, and the wall thickness and inner and outer diameters will change. During the bending process of the pipe, due to the tangential tensile stress on the outer side, the wall thickness will be thinned. If the thinning is serious, it will cause rupture; the inner side will be subjected to the tangential compressive stress, resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D9/01
CPCB21D9/01
Inventor 于正洋张春刚王敬康军卫周静
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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