CN114273468A - Thermal sizing process for vacuum brazing part - Google Patents
Thermal sizing process for vacuum brazing part Download PDFInfo
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- CN114273468A CN114273468A CN202111408695.3A CN202111408695A CN114273468A CN 114273468 A CN114273468 A CN 114273468A CN 202111408695 A CN202111408695 A CN 202111408695A CN 114273468 A CN114273468 A CN 114273468A
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- 238000005219 brazing Methods 0.000 title claims abstract description 68
- 238000004513 sizing Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 27
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000003960 organic solvent 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
- 238000007689 inspection Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000005382 thermal cycling Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 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
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 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
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the technical field of vacuum brazing of aero-engines, in particular to a thermal sizing process for vacuum brazed parts, which comprises the steps of firstly checking the inner diameter size of the parts subjected to vacuum brazing, machining a sizing clamp, cleaning the parts and the sizing clamp, then baking the parts, coaxially installing the parts on the periphery of the sizing clamp while the parts are hot, and performing thermal circulation on the parts by using a vacuum brazing furnace.
Description
Technical Field
The invention relates to the technical field of vacuum brazing of aero-engines, in particular to a thermal sizing process for vacuum brazed parts.
Background
The parts of the aero-engine have complex structures, the procedures of argon arc welding, positioning and the like of the blades are required before vacuum brazing, and the problems that the parts are scrapped and the like because the vacuum brazing temperature is high, the large end of the parts is not supported by the blades, and the large end of the parts has certain shrinkage deformation in the diameter direction after the vacuum brazing, so that the subsequent processing requirements of the parts cannot be met.
Chinese patent CN105478945A discloses a brazing method for a high-temperature alloy component of an aeroengine, which comprises the following steps: cleaning; filling brazing filler metal; primary brazing; machining; secondary brazing; and finishing the processing. This scheme is through the process of secondary brazing, guarantees high, the fan-shaped section subassembly of low pressure turbine outer loop requirement of brazing, makes the brazing warp little, but in this scheme, the vacuum brazing back, the part radial dimension still diminishes in fact, can't satisfy the follow-up processing requirement of part, causes the part to scrap the scheduling problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a thermal sizing process for vacuum brazing parts, ensures that the vacuum brazing parts meet the size requirement, and solves the problem of part scrapping caused by radial size shrinkage of the parts.
In order to solve the technical problems, the invention adopts the technical scheme that:
the thermal sizing process for the vacuum brazing part 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 the sizing fixture according to the inner diameter size of the part, baking the part, and coaxially and hot-interference-mounting the part on the periphery of the sizing fixture;
s3: controlling the temperature in the vacuum brazing furnace to be below the solidus line of brazing filler metal used by the part, and performing primary thermal circulation on the part by using the vacuum brazing furnace;
s4: after the part is cooled, taking down the part, checking the size of the part and finishing the thermal correction of the part
The invention relates to a thermal correction process of vacuum brazing parts, which comprises the steps of firstly checking the radial dimension of the parts after vacuum brazing, processing a correction clamp, then baking the parts, coaxially installing the parts outside the correction clamp while the parts are hot, and performing thermal cycle on the parts by using a vacuum brazing furnace.
Preferably, in step S2, the parts and the sizing jig are cleaned with an organic solvent before the parts and the sizing jig are mounted and engaged.
Preferably, the organic solvent is acetone.
Preferably, in step S2, the baking temperature of the part is 150min to 200min, and the baking time is 20min to 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 shape-correcting temperature T ℃ is P1The linear expansion coefficient of the calibration fixture at the calibration temperature T is P2The method comprises the following steps: x ═ P (P)2-P1)×T×D/1000000。
Preferably, in step S3, when the part is subjected to thermal cycling, the vacuum brazing furnace is heated to 500-600 ℃ at a rate of 5-10 ℃/min, and is kept warm for 20-30 min, and then heated to 1000-1050 ℃ at a rate of 5-10 ℃/min, and is kept warm for 60-90 min.
Preferably, in step S4, when the part size is checked to be not in accordance with the size requirement, the part is mounted outside the sizing jig, the gap between the part and the sizing jig is filled with a strip of the same material as the sizing jig, and the part is subjected to a heat cycle again in the vacuum brazing furnace.
Preferably, in step S4, after the thermal calibration of the part is completed, the brazing seam of the part may be subjected to a leakage check.
Preferably, the leakage inspection of the brazing seams of the parts can be carried out by using kerosene, and the specific process comprises the following steps: and (3) coating chalk powder on one side of a brazing seam of the part, drying, coating kerosene on the other side of the brazing seam of the part, standing the part for 20-30 min, and performing leakage inspection on the brazing seam of the part.
Preferably, in step S4, after the thermal correction is completed, the appearance of the brazing seam and the size of the part are checked according to part acceptance criteria.
Compared with the background technology, the thermal sizing process for the vacuum brazing part 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 of part scrapping caused by part radial size shrinkage is solved; the shape correcting temperature is below the solidus line of the brazing filler metal used for vacuum brazing of the brazed parts, the brazing seam is not melted during shape correcting, and the quality of the brazing seam is not influenced.
Drawings
FIG. 1 is a process flow diagram of the thermal sizing of vacuum brazed parts of the present invention;
FIG. 2 is a schematic view of the assembly of the parts and the sizing jig according to the present invention;
in the drawings: 1-parts; 11-a first mating portion; 12-a second mating portion; 13-a first step; 2-calibrating a fixture; 21-a first boss; 22-a second boss; 23-second step.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example one
Performing thermal calibration on the guider component after vacuum brazing, wherein the guider component 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 guider component as shown in fig. 2; the sizing jig 2 is provided with a first protruding portion 21, a second protruding portion 22 and a second step 23, the first protruding portion 21 and the second protruding portion 22 are connected through the second step 23, and the first protruding portion 21 and the second protruding portion 22 can be respectively connected with the first matching portion 11 and the second matching portion 12 in a matching mode.
The linear expansion coefficient of GH648 is about 18 and the linear expansion coefficient of 1Cr18Ni9Ti is about 20 at 1050 ℃.
When a guide assembly made of GH648 is subjected to thermal calibration, as shown in FIG. 1, first, caliper gauges are used to detect that the inner diameter of the first matching part 11 is 260mm and the inner diameter of the second matching part 12 is 250mm, a calibration jig 2 is processed by using 1Cr18Ni9Ti as a raw material so that the outer diameter of the first protruding part 21 is 260.06mm and the outer diameter of the second protruding part 22 is 250.04mm, then the guide assembly and the calibration jig 2 are cleaned by acetone, impurities on the surfaces of the guide assembly and the calibration jig 2 are removed, the acetone is volatile, the guide assembly is put into an oven and baked at 150 ℃ for 20 mm, then the guide assembly and the calibration jig 2 are connected in an interference fit manner while hot, then the guide assembly is put into a vacuum brazing furnace, the temperature is raised to 500 ℃ at a rate of 10 ℃/min and is maintained for 20min, then the temperature is raised to 1050 ℃ at a rate of 10 ℃/min, and keeping the temperature for 60min to ensure that the brazing seam is not melted in the process of sizing, cooling the guider component along with the vacuum brazing furnace, measuring the size of the guider component, and respectively increasing the inner diameter of the first matching part 11 and the inner diameter of the second matching part 12 by 0.55 mm.
When the measured size of the guider component does not meet the size requirement, the guider component is arranged on the sizing clamp 2, a circle of 1Cr18Ni9Ti strip is inserted into a gap between the guider component and the sizing clamp 2, the thickness of the strip is determined according to the size of the gap between the guider component and the sizing clamp 2, and then brazing sizing thermal circulation is carried out again to size the guider component.
After the model calibration is finished, chalk powder is coated on one side of a brazing seam of the guider component and dried, red kerosene is coated on the other side of the brazing seam of the part, the part is kept still for 20min, the red kerosene does not leak, the brazing seam connection meets the requirements, and the brazing seam quality is not affected.
The calibration jig 2 may be made of stainless steel having a coefficient of linear expansion larger than that of the component, other than 1Cr18Ni9 Ti.
Example two
The present embodiment is similar to the embodiment, except that the guide assembly after vacuum brazing is thermally calibrated, the guide assembly and the calibration jig 2 are cleaned by acetone, the guide assembly is placed into an oven and baked at 200 ℃ for 40 mm, then the guide assembly is in interference fit connection with the calibration jig 2 while hot, then the guide assembly is placed into a vacuum brazing furnace, the temperature is increased to 600 ℃ at the rate of 5 ℃/min and is kept for 30min, and then the temperature is increased to 1000 ℃ at the rate of 5 ℃/min and is kept for 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 matching part 11 and the inner diameter of the second matching part 12 are respectively increased by 0.5 mm.
In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A thermal sizing process for vacuum brazing parts is characterized by comprising the following steps:
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 sizing clamp (2) according to the inner diameter size of the part (1), baking the part (1), and coaxially and hot-interference-mounting the part (1) on the periphery of the sizing clamp (2);
s3: controlling the temperature in the vacuum brazing furnace to be below the solidus line of brazing filler metal used by the part (1), and performing primary thermal circulation on the part (1) by using the vacuum brazing furnace;
s4: and after the part (1) is cooled, taking down the part (1), checking the size of the part (1), and finishing the thermal correction of the part (1).
2. The process of claim 1, wherein in step S2, the parts (1) and the sizing jig (2) are cleaned with an organic solvent before the parts (1) and the sizing jig (2) are assembled and mated.
3. The process of claim 2, wherein the organic solvent is acetone.
4. The thermal sizing process for vacuum brazing parts as claimed in claim 1, wherein in step S2, the baking temperature of the parts (1) is 150-200 ℃; the baking time is 20-40 min.
5. The process of claim 1, wherein in step S3, the inside diameter of the part (1) is defined as Dmm, the inside diameter elongation of the part (1) is defined as Xmm, the temperature in the vacuum brazing furnace is defined as T ℃, and the coefficient of linear expansion of the part (1) at the calibration temperature T ℃ is defined as P1The linear expansion coefficient of the sizing clamp (2) at the sizing temperature T ℃ is P2The method comprises the following steps: x ═ P (P)2-P1)×T×D/1000000。
6. The thermal sizing process for vacuum brazing parts according to claim 1, wherein in step S3, when the part (1) is subjected to thermal cycling, the vacuum brazing furnace is heated to 500 ℃ to 600 ℃ at a rate of 5 ℃ to 15 ℃/min and is kept warm for 20min to 30min, and then heated to 1000 ℃ to 1050 ℃ at a rate of 5 ℃ to 10 ℃/min and is kept warm for 60min to 90 min.
7. The vacuum brazing part thermal sizing process according to claim 1, wherein in step S4, when the size of the part (1) is checked to be out of the size requirement, the part (1) is mounted outside the sizing jig (2), the gap between the part (1) and the sizing jig (2) is filled with a strip of the same material as the sizing jig (2), and the part (1) is subjected to one more thermal cycle in the vacuum brazing furnace.
8. The process of hot-sizing vacuum brazed parts according to any one of claims 1 to 7, wherein in step S4, after completion of the hot-sizing of the part (1), the braze joint of the part (1) may be leak checked.
9. The thermal sizing process for vacuum brazed parts according to claim 8, wherein the brazing seams of the parts (1) can be checked for leaks by kerosene, by the specific process: 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).
10. The process of heat-sizing vacuum brazed parts according to any one of claims 1 to 7, wherein in step S4, after the heat-sizing is completed, the appearance of the brazing seam and the dimensions of the part (1) are checked according to part (1) acceptance criteria.
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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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| CN202111408695.3A CN114273468B (en) | 2021-11-24 | 2021-11-24 | Thermal correction process for vacuum brazing parts |
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| CN114273468B 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 (2)
| Title |
|---|
| 周述经: "热膨胀校正法", 《机械工人.热加工》 * |
| 周述经: "热膨胀校正法", 《机械工人.热加工》, no. 01, 31 January 1987 (1987-01-31), pages 12 - 13 * |
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