CN114273468B - Thermal correction process for vacuum brazing parts - Google Patents
Thermal correction process for vacuum brazing parts Download PDFInfo
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- CN114273468B CN114273468B CN202111408695.3A CN202111408695A CN114273468B CN 114273468 B CN114273468 B CN 114273468B CN 202111408695 A CN202111408695 A CN 202111408695A CN 114273468 B CN114273468 B CN 114273468B
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- vacuum brazing
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- 238000005219 brazing Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 22
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 230000013011 mating Effects 0.000 claims description 7
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000005382 thermal cycling Methods 0.000 abstract 1
- 238000004513 sizing Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention relates to the technical field of vacuum brazing of aeroengines, in particular to a hot calibration process for vacuum brazing parts, which comprises the steps of firstly checking the inner diameter size of the vacuum brazed parts, processing a calibration fixture, cleaning the parts and the calibration fixture, baking the parts, coaxially installing the parts on the periphery of the calibration fixture while the parts are hot, and carrying out thermal cycling on the parts by utilizing a vacuum brazing furnace.
Description
Technical Field
The invention relates to the technical field of vacuum brazing of aeroengines, in particular to a thermal calibration process for vacuum brazed parts.
Background
Because the aeroengine part has a complex structure, the working procedures of argon arc welding, blade positioning and the like are needed before vacuum brazing, and because the vacuum brazing temperature is higher, the large end of the part is free of blade support, and certain shrinkage deformation exists in the diameter direction of the large end after the vacuum brazing, the subsequent processing requirements of the part cannot be met, and the part is scrapped.
Chinese patent CN105478945a discloses a brazing method for high temperature alloy components of aero-engine, comprising the steps of: cleaning; filling brazing filler metal; primary brazing; machining; secondary brazing; and finishing the processing. According to the scheme, the brazing requirements of the high-pressure turbine outer ring sector section assembly and the low-pressure turbine outer ring sector section assembly are guaranteed through a secondary brazing process, so that the brazing deformation is small, but in the scheme, after vacuum brazing, the radial size of a part is still actually reduced, the subsequent processing requirements of the part cannot be met, and the part is scrapped.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a thermal correction process for vacuum brazing parts, ensures that the vacuum brazing parts meet the size requirement, and solves the problem that the parts are scrapped due to radial size shrinkage of the parts.
In order to solve the technical problems, the invention adopts the following technical scheme:
the vacuum brazing part hot-correcting process comprises the following steps:
s1: measuring the inner diameter size of the part;
s2: selecting a raw material with a linear expansion coefficient larger than that of the part, processing a correction clamp according to the inner diameter size of the part, baking the part, and coaxially and hot-tightly mounting the part on the periphery of the correction clamp;
s3: controlling the temperature in the vacuum brazing furnace to be below the solidus of brazing filler metal used by the parts, and performing primary thermal cycle on the parts by using the vacuum brazing furnace;
s4: after the part is cooled, the part is taken down, and the size of the part is checked to finish the thermal calibration of the part
The invention relates to a thermal correction process for vacuum brazing parts, which comprises the steps of firstly checking the radial dimension of the vacuum brazing parts, processing a correction clamp, baking the parts, coaxially installing the parts on the outer sides of the correction clamp while the parts are hot, and carrying out thermal circulation on the parts by utilizing a vacuum brazing furnace.
Preferably, in step S2, the parts and the sizing fixture are cleaned with an organic solvent before the parts and the sizing fixture are assembled and matched.
Preferably, the organic solvent is acetone.
Preferably, in the step S2, the temperature for baking the parts is 150-200 min, and the baking time is 20-40 min.
Preferably, in step S3, the inside diameter of the part is Dmm, the inside diameter elongation of the part is Xmm, the temperature in the vacuum brazing furnace is T ℃, and the linear expansion coefficient of the part at the calibration temperature T ℃ is P 1 The linear expansion coefficient of the correction clamp at the correction temperature T is P 2 The method comprises the following steps: x= (P) 2 -P 1 )×T×D/1000000。
Preferably, in the step S3, when the thermal cycle is carried out on the parts, the vacuum brazing furnace is heated to 500-600 ℃ at the speed of 5-10 ℃/min, and is kept for 20-30 min, and then heated to 1000-1050 ℃ at the speed of 5-10 ℃/min, and is kept for 60-90 min.
Preferably, in step S4, when the size of the part is checked to be insufficient, the part is mounted outside the calibration jig, a gap between the part and the calibration jig is filled with the same tape as the material of the calibration jig, and the part is subjected to a thermal cycle again by the vacuum brazing furnace.
Preferably, in step S4, after the thermal correction of the part is completed, the part may be checked for leaks in the solder joints.
Preferably, the drill joint of the part can be subjected to leakage inspection by using kerosene, and the specific process is as follows: and (3) coating chalk powder on one side of the part brazing seam, drying, coating kerosene on the other side of the part brazing seam, standing the part for 20-30 min, and performing leakage inspection on the part brazing seam.
Preferably, in step S4, after the thermal correction is completed, the appearance of the solder joint and the size of the part are inspected according to the part acceptance criteria.
Compared with the background technology, the vacuum brazing part thermal correction technology of the invention has the following beneficial effects:
the radial size of the part is increased, the vacuum brazing part is ensured to meet the size requirement, and the problem that the part is scrapped due to the shrinkage of the radial size of the part is solved; the correction temperature is below the solidus of the brazing filler metal used for vacuum brazing of the brazed parts, the brazing seam is not melted during correction, and the quality of the brazing seam is not affected.
Drawings
FIG. 1 is a process flow diagram of a vacuum brazing part thermal calibration in accordance with the present invention;
FIG. 2 is a schematic view of the installation of the parts and calibration jig of the present invention;
in the accompanying drawings: 1-parts; 11-a first mating portion; 12-a second mating portion; 13-a first step; 2-calibrating a clamp; 21-a first boss; 22-a second boss; 23-second step.
Detailed Description
The invention is further described below in connection with the following detailed description.
Example 1
Performing thermal correction on the vacuum brazed guide assembly, wherein the guide assembly is provided with a first matching part 11, a second matching part 12 and a first step 13, the first matching part 11 and the second matching part 12 are connected through the first step 13, and the first matching part 11 is arranged at the end part of the guide assembly as shown in fig. 2; the calibration jig 2 is provided with a first boss 21, a second boss 22 and a second step 23, the first boss 21 and the second boss 22 are connected by the second step 23, and the first boss 21 and the second boss 22 are respectively fittingly connectable with the first fitting portion 11 and the second fitting portion 12.
At 1050 ℃, GH648 has a linear expansion coefficient of about 18 and 1cr18ni9ti has a linear expansion coefficient of about 20.
When the guide assembly made of GH648 is subjected to thermal correction, as shown in FIG. 1, the inner diameter of the first matching part 11 is 260mm and the inner diameter of the second matching part 12 is 250mm, the correction clamp 2 is processed by using 1Cr18Ni9Ti as a raw material, the outer diameter of the first protruding part 21 is 260.06mm, the outer diameter of the second protruding part 22 is 250.04mm, then the guide assembly and the correction clamp 2 are cleaned by acetone, impurities on the surfaces of the guide assembly and the correction clamp 2 are removed, the acetone is easy to volatilize, the guide assembly is placed in an oven and baked at 150 ℃ for 20 mm in the atmosphere, then the guide assembly and the correction clamp 2 are in interference fit connection while hot, then the guide assembly is placed in a vacuum brazing furnace, the solidus of the guide assembly brazing filler metal is heated to 500 ℃ at a speed of 10 ℃/min, the temperature is heated to 1050 ℃ at a speed of 10 ℃/min, the temperature is kept for 60min, the brazing seam is prevented from melting in the correction process, the guide assembly is cooled along with the vacuum brazing furnace, and the inner diameter of the first matching part 11 and the second matching part 12.55 mm are measured.
When the measured size of the guide assembly does not meet the size requirement, the guide assembly is installed on the sizing fixture 2, a circle of 1Cr18Ni9Ti belt material is plugged in a gap between the guide assembly and the sizing fixture 2, the thickness of the belt material is determined according to the size of the gap between the guide assembly and the sizing fixture 2, and brazing sizing thermal cycle is performed again to perform sizing on the guide assembly.
After correction is completed, chalk powder is coated on one side of the drill seam of the guide component and dried, red kerosene is coated on the other side of the drill seam of the part, the part is kept stand for 20min, no red kerosene leaks, the drill seam connection meets the requirements, and the quality of the drill seam is not affected.
The calibration jig 2 may be made of stainless steel having a linear expansion coefficient larger than that of the component, except for 1Cr18Ni9 Ti.
Example two
This embodiment is similar to the embodiment except that the vacuum brazed guide assembly is subjected to thermal calibration, the guide assembly and the calibration jig 2 are cleaned with acetone, the guide assembly is put into an oven and baked at 200 ℃ for 40 mm in atmosphere, then the guide assembly and the calibration jig 2 are connected in an interference fit while hot, then the guide assembly is put into a vacuum brazing furnace, the temperature is raised to 600 ℃ at a rate of 5 ℃/min and kept at the temperature of 30min, the temperature is raised to 1000 ℃ at a rate of 5 ℃/min and kept at the temperature of 90min, the guide assembly is cooled along with the vacuum brazing furnace, the size of the guide assembly is measured, and the inner diameter of the first fitting portion 11 and the inner diameter of the second fitting portion 12 are respectively increased by 0.5mm.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. A vacuum brazing part thermal correction process for a guide assembly provided with a first mating portion (11), a second mating portion (12) and a first step (13), the first mating portion (11) and the second mating portion (12) being connected by the first step (13), and the first mating portion (11) being provided at an end of the guide assembly, characterized by comprising the steps of:
s1: measuring the inner diameter size of the part (1);
s2: selecting a raw material with a linear expansion coefficient larger than that of the part (1), processing the correction clamp (2) according to the inner diameter size of the part (1), baking the part (1), and coaxially and hot-tightly mounting the part (1) on the periphery of the correction clamp (2); the correction clamp (2) is provided with a first protruding part (21), a second protruding part (22) and a second step (23), the first protruding part (21) and the second protruding part (22) are connected through the second step (23), and the first protruding part (21) and the second protruding part (22) are respectively connected with the first matching part (11) and the second matching part (12) in a matching way; wherein the temperature for baking the part (1) is 150-200 ℃; the baking time is 20-40 min;
s3: controlling the temperature in the vacuum brazing furnace to be below the solidus of brazing filler metal used by the part (1), and performing one-time thermal cycle on the part (1) by using the vacuum brazing furnace; assuming that the inner diameter dimension of the part (1) is Dmm, the inner diameter elongation of the part (1) is Xmm, the temperature in the vacuum brazing furnace is T ℃, and the linear expansion coefficient of the part (1) at the correction temperature T ℃ isThe linear expansion coefficient of the calibration fixture (2) at the calibration temperature T DEG C is +.>The method comprises the following steps: />The method comprises the steps of carrying out a first treatment on the surface of the When the part (1) is subjected to thermal cycle, the vacuum brazing furnace is heated to 500-600 ℃ at the speed of 5-15 ℃ per minute, is kept for 20-30 min, is heated to 1000-1050 ℃ at the speed of 5-10 ℃ per minute, and is kept for 60-90 min;
s4: after the part (1) is cooled, the part (1) is taken down, the size of the part (1) is checked, and the thermal correction of the part (1) is completed; when the size of the part (1) is checked to be not in accordance with the size requirement, the part (1) is arranged on the outer side of the correction clamp (2), a gap between the part (1) and the correction clamp (2) is filled with a belt material which is the same as the raw material of the correction clamp (2), and the part (1) is subjected to one-time thermal cycle again by using a vacuum brazing furnace.
2. The thermal correction process for vacuum brazing parts according to claim 1, wherein in step S2, the parts (1) and the correction jigs (2) are cleaned with an organic solvent before the parts (1) and the correction jigs (2) are fitted.
3. The vacuum brazing part thermal calibration process according to claim 2, wherein the organic solvent is acetone.
4. A vacuum brazing part hot-dip process according to any one of claims 1 to 3, wherein in step S4, after the hot-dip of the part (1) is completed, the part (1) is inspected for leaks.
5. The thermal calibration process for vacuum brazing parts according to claim 4, wherein the leak inspection of the brazing seam of the part (1) with kerosene is performed by: and (3) coating chalk powder on one side of the brazing seam of the part (1) and drying, coating kerosene on the other side of the brazing seam of the part (1), standing the part for 20-30 min, and performing leakage inspection on the brazing seam of the part (1).
6. A vacuum brazing part hot-dip process according to any one of claims 1 to 3, wherein in step S4, after hot-dip is completed, the appearance of the braze joint and the dimensions of the part (1) are inspected according to the acceptance criteria of the part (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111408695.3A CN114273468B (en) | 2021-11-24 | 2021-11-24 | Thermal correction process for vacuum brazing parts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111408695.3A CN114273468B (en) | 2021-11-24 | 2021-11-24 | Thermal correction process for vacuum brazing parts |
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| CN114273468A CN114273468A (en) | 2022-04-05 |
| CN114273468B true CN114273468B (en) | 2024-03-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4708749A (en) * | 1984-11-27 | 1987-11-24 | Ardal Og Sunndal Verk A.S. | Method of calibrating vehicle wheels to a finished size |
| CN105312367A (en) * | 2015-11-30 | 2016-02-10 | 上海电机学院 | Orthopedic device and orthopedic method for high-strength steel thin-wall annular forging piece |
| CN110000248A (en) * | 2019-05-16 | 2019-07-12 | 沈阳飞机工业（集团）有限公司 | A kind of the hot sizing method and tooling of titanium alloy л shape weldment |
| CN112024750A (en) * | 2020-11-05 | 2020-12-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-layer thin-wall sheet metal casing shape correction and heat treatment setting clamp and method |
| CN113477820A (en) * | 2021-07-29 | 2021-10-08 | 中国航发贵州黎阳航空动力有限公司 | Annular part thermal expansion correction tool and correction method |
-
2021
- 2021-11-24 CN CN202111408695.3A patent/CN114273468B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4708749A (en) * | 1984-11-27 | 1987-11-24 | Ardal Og Sunndal Verk A.S. | Method of calibrating vehicle wheels to a finished size |
| CN105312367A (en) * | 2015-11-30 | 2016-02-10 | 上海电机学院 | Orthopedic device and orthopedic method for high-strength steel thin-wall annular forging piece |
| CN110000248A (en) * | 2019-05-16 | 2019-07-12 | 沈阳飞机工业（集团）有限公司 | A kind of the hot sizing method and tooling of titanium alloy л shape weldment |
| CN112024750A (en) * | 2020-11-05 | 2020-12-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-layer thin-wall sheet metal casing shape correction and heat treatment setting clamp and method |
| CN113477820A (en) * | 2021-07-29 | 2021-10-08 | 中国航发贵州黎阳航空动力有限公司 | Annular part thermal expansion correction tool and correction method |
Non-Patent Citations (1)
| Title |
|---|
| 热膨胀校正法;周述经;《机械工人.热加工》;19870131(第01期);第12-13页 * |
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