CN110918416A - Main bearing part repairing method based on three-dimensional material increase - Google Patents
Main bearing part repairing method based on three-dimensional material increase Download PDFInfo
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- CN110918416A CN110918416A CN201911251967.6A CN201911251967A CN110918416A CN 110918416 A CN110918416 A CN 110918416A CN 201911251967 A CN201911251967 A CN 201911251967A CN 110918416 A CN110918416 A CN 110918416A
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- spraying
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- main bearing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0486—Operating the coating or treatment in a controlled atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/40—Maintaining or repairing aircraft
Abstract
The application provides a main bearing part repairing method based on three-dimensional material increase, which belongs to the technical field of metal part maintenance, and comprises the following steps: determining a spraying configuration according to the material of the main force-bearing part, wherein the spraying configuration comprises the type of the material for spraying and the type of gas for bringing the material for spraying to a preset speed; determining the sprayed thickness and the length range vertical to the crack according to the loading condition of the main bearing part; and finally, spraying the crack area of the main bearing part according to the determined spraying thickness and length range. The three-dimensional material increase-based main bearing part repairing method has the advantages that the original structure is not damaged, construction in a narrow space can be achieved, the limitation of the shape of parts is avoided, the bonding strength is high, the environmental suitability is high, and the like, and the traditional repairing technology can be replaced.
Description
Technical Field
The application belongs to the technical field of metal part maintenance, and particularly relates to a main bearing part repairing method based on three-dimensional material increase.
Background
The main bearing component of the airplane body is easy to generate fatigue cracks due to large bearing load, and the flight safety is directly endangered once the main bearing component is damaged. The member has a complex structure and a narrow construction passage, is often in a fuel environment, and has severe limitation on crack repair means. The traditional bolt connection reinforcement and glue joint reinforcement repair modes or friction stir welding are not enough.
Therefore, a method for effectively repairing the main bearing part is needed.
Disclosure of Invention
The application aims to provide a method for repairing a main bearing part based on three-dimensional additive so as to solve or alleviate at least one problem in the background art.
The technical scheme of the application is as follows: a main bearing part repairing method based on three-dimensional material increase is characterized by comprising the following steps:
determining a spraying configuration according to the material of the main force-bearing part, wherein the spraying configuration comprises the type of the material for spraying and the type of gas for bringing the material for spraying to a preset speed;
determining the sprayed thickness and the length range vertical to the crack according to the loading condition of the main bearing part, wherein the sprayed thickness is determined by the following formula:
the length range of the spray coating is determined by the following formula:
in the formula, deltaSpraying of paintFor spraying additive thickness, deltaOne-sided spray coatingFor one-sided spraying of additive thickness, deltaOriginalIs the thickness of the original component, σ original is the maximum working stress of the original component, σb spray coating bodyFor tensile strength of the sprayed body, σBonding ofIs the maximum working stress after the spraying body is combined with the original component, LSpraying of paintThe length of the vertical crack of the spraying body is shown, k is a load correction coefficient, and m is a load bearing coefficient;
and finally, spraying the crack area of the main bearing part according to the determined spraying thickness and length range.
In a preferred embodiment of the application, the material type is of the same material family as the material of the main messenger.
In a preferred embodiment of the present application, the gas type is nitrogen which is lighter than air and non-flammable.
In the preferred embodiment of the present application, the load correction coefficient k has the following values:
when the stress ratio is-1, k is 0.28, when the stress ratio is 0.1, k is 0.45, and when the stress ratio is 0.5, k is 0.59.
In the preferred embodiment of the application, the loading coefficient m is 4-6.
In the preferred embodiment of the application, the non-spraying area is protected during the spraying process of the crack area of the main bearing part.
In a preferred embodiment of the present application, the protection method comprises: and adopting a high-temperature-resistant double-sided adhesive tape to adhere to the periphery of the spraying area.
In the preferred embodiment of the application, during the spraying process of the crack area of the main bearing part, the surface roughness of the spraying area is increased so as to improve the adhesion of the spraying material.
In a preferred embodiment of the present application, the method of increasing surface roughness comprises: and carrying out sand blasting treatment on the spraying area.
The three-dimensional material increase-based main bearing part repairing method has the advantages that the original structure is not damaged, construction in a narrow space can be achieved, the limitation of the shape of parts is avoided, the bonding strength is high, the environmental suitability is high, and the like, and the traditional repairing technology can be replaced.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
Fig. 1 is a schematic view of a main load-bearing member repairing method of the application.
Fig. 2 is a structural schematic diagram of the main load-bearing member after repair method.
In the figure, 1 is a base body of a main bearing component, 2 is an upper side spray coating body, 3 is a lower side spray coating body, and 4 is a crack.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
In order to solve the problems in the background art, the application provides a main bearing component repairing method based on three-dimensional material increase, the repairing method is based on a jet flow principle, spraying particles are driven by high-pressure gas to form high-speed particle jet flow, the high-speed particle jet flow collides with a component to be repaired to generate severe plastic deformation, and a deposition layer (namely a spraying body) is formed on the surface of the component to be repaired.
As shown in fig. 1 and fig. 2, the method for repairing a main bearing part based on three-dimensional additive comprises the following steps:
s1, establishing a repair scheme for additive repair
And (3) making a repair scheme according to the material property, the structural characteristics, the loading condition and the like of the main bearing component, wherein the material of the main bearing component is the key, and determining the spraying configuration through the material of the main bearing component. Wherein the spray pattern includes a type of material for spraying and a type of gas that brings the material for spraying to a predetermined velocity.
In the application, the type of the material used for spraying is required to be the same as or similar to that of the main bearing part. In addition, the type of gas used in the spray coating is preferably a lighter gas, such as nitrogen, which is lighter than air and non-flammable.
For example, the spraying configuration of 2024 type powder and helium can be suitable for repairing 2 series aluminum alloy main bearing components, and the spraying configuration of 7075 type powder and helium is suitable for repairing 7 series aluminum alloy main bearing components. It should be noted that 2024 type and 7075 type are both high strength aluminum (duralumin) alloy powders, and the strength is close to that of the main load-bearing structure to be repaired.
In the calculation of the sprayed body in the following examples, a 7-series aluminum alloy main bearing member was taken as an example, and a sprayed configuration of 7075 type powder and nitrogen gas was used.
S2, determining the thickness of the sprayed body (deposited layer) and the length range vertical to the crack according to the loading condition of the main bearing component, wherein the sprayed thickness is determined by the following formula:
the length range of the spray coating is determined by the following formula:
in the formula, deltaSpraying of paintFor spraying additive thickness, deltaOne-sided spray coatingFor one-sided spraying of additive thickness, deltaOriginalThickness of the original component, σOriginalMaximum working stress of the original component, σb spray coating bodyFor tensile strength of the sprayed body, σBonding ofIs the maximum working stress after the spraying body is combined with the original component, LSpraying of paintThe length of the vertical crack of the sprayed body is shown as k, a load correction coefficient and m, a load coefficient.
In the present application, the load correction coefficient k takes the following values: when the stress ratio is-1, k is 0.28, when the stress ratio is 0.1, k is 0.45, and when the stress ratio is 0.5, k is 0.59.
In the application, the loading coefficient m is generally 4-6 according to the loading condition.
In the above embodiment, the maximum working stress of the main bearing component to be repaired is known to be 170MPa, the stress ratio is-1, and the thickness is 10 mm; the tensile strength of the spray coating formed by 7075 type powder is 220MPa, and the thickness of the spray coating subjected to additive repair can be obtained according to the formula:
since the main bearing component before repair can be sprayed on both sides, the determined one-side spraying thickness is 9mm (not less than half of the total spraying thickness).
In the present application, the maximum thickness of the single-layer or single-sided spray body should not exceed 12 mm.
The bonding strength of the spray body formed by 7075 type powder is known to be more than 60MPa, and the length range of the spray body for additive repair can be obtained according to the formula:
therefore, the length range of the vertical cracks of the determined sprayed body was 40mm after the whole.
And S3, finally, spraying the crack area of the main bearing part according to the spraying thickness and length range determined in the process.
Wherein, the spraying process comprises the following steps:
3.1) using a high-temperature resistant (not lower than 300 ℃) double-sided tape to protect a non-spraying area, only keeping the spraying area, wherein the non-bonding surface of the double-sided tape can adsorb the powder splashed in the spraying process.
3.2) carrying out sand blasting on the spraying area, for example, corundum sand can be adopted for carrying out sand blasting treatment, the sand blasting range is larger than the spraying area or the spraying range, the movement of a spray gun is stable, and the metallic luster of the matrix is exposed after sand blasting.
The grit blasting may remove the anodized layer from the surface of the part to be repaired and increase the surface roughness.
3.3) the spraying operation can only be carried out under conditions where the ambient humidity is not more than 60%. In the implementation process, the temperature of the base body is monitored in real time, and the allowable temperature of the base body is prevented from being exceeded. The upper limit of the substrate temperature of the 7-series aluminum alloy member in the repairing process in this embodiment is not more than 120
。
3.4) after the spraying is finished, mechanical repairing operation can be carried out only if the natural failure is not less than 24 hours. The sprayed body was ground to 9mm using a pneumatic grinding tool. And manually grinding corners, shaping and polishing by using 400-mesh sand paper. And after finishing polishing, removing the double-sided adhesive tape and cleaning the repair area. And (3) after the work is finished, carrying out oxidation treatment on the surface of the sprayed coating by using alodine and brushing primer.
The method for repairing the main bearing part based on the three-dimensional additive can meet the requirements of repairing different types of damages such as cracks, corrosion, abrasion, scratch and the like of the main bearing component of metal, and is particularly suitable for the main bearing component made of aluminum alloy; the repair is not limited by the shape of the component to be repaired, and the repair requirement of the opposite component can be met; the spray body has strong designability, and the thickness, the shape and the like of the spray body can be designed according to the requirement of a component to be repaired. The method can completely inhibit the expansion of crack damage, and has good repairing effect on damages such as corrosion, abrasion and scratch.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A main bearing part repairing method based on three-dimensional material increase is characterized by comprising the following steps:
determining a spraying configuration according to the material of the main force-bearing part, wherein the spraying configuration comprises the type of the material for spraying and the type of gas for bringing the material for spraying to a preset speed;
determining the sprayed thickness and the length range vertical to the crack according to the loading condition of the main bearing part, wherein the sprayed thickness is determined by the following formula:
the length range of the spray coating is determined by the following formula:
in the formula, deltaSpraying of paintFor spraying additive thickness, deltaOne-sided spray coatingFor one-sided spraying of additive thickness, deltaOriginalThickness of the original component, σOriginalMaximum working stress of the original component, σb spray coating bodyFor tensile strength of the sprayed body, σBonding ofIs the maximum working stress after the spraying body is combined with the original component, LSpraying of paintThe length of the vertical crack of the spraying body is shown, k is a load correction coefficient, and m is a load bearing coefficient;
and finally, spraying the crack area of the main bearing part according to the determined spraying thickness and length range.
2. The three-dimensional additive-based main messenger repair method of claim 1 wherein the material type is of the same material family as the material of the main messenger.
3. The method for repairing a main force-bearing part based on three-dimensional additive according to claim 1, wherein the gas type is nitrogen which is lighter than air and non-flammable.
4. The method for repairing the main bearing part based on the three-dimensional additive according to claim 1, wherein the load correction coefficient k has the following values:
when the stress ratio is-1, k is 0.28, when the stress ratio is 0.1, k is 0.45, and when the stress ratio is 0.5, k is 0.59.
5. The method for repairing the main force-bearing part based on the three-dimensional additive materials according to claim 1, wherein the load coefficient m is 4-6.
6. The three-dimensional additive based main load-bearing part repairing method according to claim 1, characterized in that in the process of spraying the crack area of the main load-bearing part, the non-sprayed area is protected.
7. The three-dimensional additive-based main force-bearing part repairing method according to claim 6, wherein the protection mode comprises the following steps: and adopting a high-temperature-resistant double-sided adhesive tape to adhere to the periphery of the spraying area.
8. The method for repairing the main bearing part based on the three-dimensional additive according to claim 1, wherein in the process of spraying the crack area of the main bearing part, the surface roughness of the sprayed area is increased to improve the adhesion of the sprayed material.
9. The three-dimensional additive-based main force-bearing part repairing method according to claim 8, wherein the method for increasing the surface roughness comprises the following steps: and carrying out sand blasting treatment on the spraying area.
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| CN201911251967.6A CN110918416B (en) | 2019-12-09 | 2019-12-09 | Main bearing part repairing method based on three-dimensional material increase |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112475300A (en) * | 2020-11-25 | 2021-03-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Jet flow additive repairing process method for aluminum alloy base material |
| CN112496870A (en) * | 2020-11-25 | 2021-03-16 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for pretreating surface of substrate before high-speed jet flow additive repair |
| CN112518157A (en) * | 2020-11-25 | 2021-03-19 | 中国航空工业集团公司沈阳飞机设计研究所 | Temperature control method for high-speed jet material increase repair of aluminum alloy structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112475300A (en) * | 2020-11-25 | 2021-03-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Jet flow additive repairing process method for aluminum alloy base material |
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| CN112518157A (en) * | 2020-11-25 | 2021-03-19 | 中国航空工业集团公司沈阳飞机设计研究所 | Temperature control method for high-speed jet material increase repair of aluminum alloy structure |
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