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A choke pin for brazing and repairing engine blades with vent holes and its preparation method

An exhaust hole and engine technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of easily polluting the brazing surface, shorten the repair cycle, shorten the drilling process, etc., to improve the effect of choke protection, The effect of shortening the repair cycle and shortening the drilling process

Active Publication Date: 2018-10-30
国营川西机器厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a choke pin for brazing and repairing an engine blade with a vent hole and a preparation method, sintering a layer of glass frit high-temperature ceramics on the periphery of the alloy pin, and then coating the surface of the high-temperature ceramics A layer of oxide-type slurry-like choke agent is applied to obtain a choke pin with a three-layer structure, which effectively solves the problem that the slurry choke agent is easy to fall off and pollutes the brazing surface during use, and improves the choke protection The effect thus improves the brazing quality, shortens the drilling process caused by poor hole plugging, and shortens the repair cycle

Method used

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  • A choke pin for brazing and repairing engine blades with vent holes and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for brazing and repairing a choke pin of an engine vane with vent holes, comprising the following steps:

[0030] S1. Make conical alloy pins, and then perform dry blasting treatment on the surface of the alloy pins;

[0031] S2. Mix and stir 60 parts by weight of glass frit, 35 parts by weight of chromium oxide, 3 parts by weight of clay and 60 parts by weight of distilled water to obtain a glaze slurry. The specific gravity of the glaze slurry in terms of liquid specific gravity is 1.8 , the viscosity is 12s; the glass frit is composed of the following raw materials in terms of mass percentage: 41-45% SiO 2 , 40.5-44.5% BaO, 3.6-4.1% CaO, 4.8-5.3% ZnO, 2.3-2.6% BeO, 2.3-3.1% MoO 3 ;

[0032] S3. Spray a layer of glaze slurry evenly on the surface of the alloy pin, then immerse the alloy pin in the glaze slurry, then lift it up at a speed of 10cm / s, dry it in the air for 35min, then dry it at 80-120°C for 30min, at 1050 Heat preservation and mel...

Embodiment 2

[0035] A preparation method for brazing and repairing a choke pin of an engine vane with vent holes, comprising the following steps:

[0036] S1. Make conical alloy pins, and then perform dry blasting treatment on the surface of the alloy pins;

[0037] S2. Mix and stir the glass frit of 80 parts by weight, the dichromium oxide of 25 parts by weight, the clay of 7 parts by weight and the distilled water of 80 parts by weight to obtain a glaze slurry, and the specific gravity of the glaze slurry in terms of liquid specific gravity is 1.95 , the viscosity is 13.5s; the glass frit is composed of the following raw materials in mass percentage: 41-45% SiO 2 , 40.5-44.5% BaO, 3.6-4.1% CaO, 4.8-5.3% ZnO, 2.3-2.6% BeO, 2.3-3.1% MoO 3 ;

[0038] S3. Spray a layer of glaze slurry evenly on the surface of the alloy pin, then immerse the alloy pin in the glaze slurry, then lift it up at a speed of 20cm / s, dry it in the air for 25min, then dry it at 80-120°C for 60min, at 1050 Heat pres...

Embodiment 3

[0041] A preparation method for brazing and repairing a choke pin of an engine vane with vent holes, comprising the following steps:

[0042] S1. Make conical alloy pins, and then perform dry blasting treatment on the surface of the alloy pins;

[0043] S2. Mix and stir 70 parts by weight of glass frit, 30 parts by weight of chromium oxide, 5 parts by weight of clay and 70 parts by weight of distilled water to obtain a glaze slurry, the specific gravity of which is 1.85 in terms of liquid specific gravity , the viscosity is 12.5s; the glass frit is composed of the following raw materials in terms of mass percentage: 41-45% SiO 2 , 40.5-44.5% BaO, 3.6-4.1% CaO, 4.8-5.3% ZnO, 2.3-2.6% BeO, 2.3-3.1% MoO 3 ;

[0044] S3. Spray a layer of glaze slurry evenly on the surface of the alloy pin, then immerse the alloy pin in the glaze slurry, lift it up at a speed of 15cm / s, dry it in the air for 30min, then dry it at 80-120°C for 40min, and then dry it at 1050℃ Heat preservation and...

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Abstract

The invention relates to the technical field of aero-engine maintenance, in particular to a flow choking pin used for brazing repair of an engine blade with exhaust holes and a preparation method. A frit high-temperature ceramic layer is arranged on the periphery of an alloy pin in a sintered mode, then the surface of the high-temperature ceramic is coated with an oxide slurry-type flow choking agent, and the flowing choking pin of a three-layer structure is obtained. The problem that slurry flow choking agents are prone to falling off and polluting brazed surfaces during usage is effectively solved, and the flow-choking protection effect is improved, so that the brazing quality is improved; and the hole cleaning procedure due to hole blockage is shortened, and the repair cycle is shortened. The flowing choking pin of the three-layer structure is well attached to the walls of the exhaust edge holes, the brazing quality is stable when failures such as cracks of exhaust edges are subjected to brazing repair, the holes are kept intact, and the exhaust edge holes are free of hole blockage and collapse phenomena after brazing; and meanwhile, the preparation method of the flow choking pin is simple, the preparation cost is low, and the flow choking pin can be widely applied to brazing repair of aero-engine blades with exhaust holes.

Description

technical field [0001] The invention relates to the technical field of aero-engine maintenance, in particular to a choke pin for brazing and repairing engine blades with vent holes and a preparation method thereof. Background technique [0002] The blades of a certain type of aero-engine with exhaust holes often have faults such as deformation of the exhaust edge and penetrating cracks during use. In the maintenance process, the faults of the exhaust edge of the blade are usually repaired by brazing. In the process of brazing and repairing the fault on the edge of the blade exhaust hole, high-temperature molten solder often flows into the exhaust hole and causes the hole to be blocked. After brazing, the holes need to be cleaned. The surface is complex, the hole diameter of the blade varies greatly after use, the cleaning of the exhaust hole is difficult, and the labor efficiency is low. During the cleaning process, it is easy to cause damage to the exhaust side wall. perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K3/08C03C8/04
CPCB23K1/0008B23K3/08C03C8/04
Inventor 程小红陈海生侯廷红郭连平付俊波杨成龙翟建楠
Owner 国营川西机器厂
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