Aircraft dry metal tube drying runner and runner 3D printing process

Abstract

The application belongs to the technical field of additive manufacturing, and particularly relates to an airplane drying metal pipe drying flow channel and a 3D printing process thereof. The airplane drying metal pipe drying flow channel comprises a pipe body shell manufactured by additive manufacturing, an inner wall of the pipe body shell is provided with a pipe wall manufactured by additive manufacturing, and an inner wall of the pipe wall is formed by a plurality of molecular structures along a center line of the pipe body shell. The 3D printing process of the airplane drying metal pipe drying flow channel can split the internal structure of the airplane drying metal pipe into a plurality of bricks with uniform shapes, and then modify the material and size of the bricks according to the stress and wall thickness of the airplane drying metal pipe. The molecular structure can reduce the amount of additive material on the basis of stable stress, meet the requirements of moisture absorption prevention, impurity filtration, oil life extension, icing prevention and light weight of the airplane drying metal pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to a kind of aircraft drying metal pipe drying runner and runner 3D printing process. BACKGROUND

[0002] Desiccant breather or desiccant dryer tube on aircraft is a device used to absorb moisture, keep hydraulic system, fuel system or other critical components dry. It is usually filled with desiccant (such as silica gel, molecular sieve, etc.), which can effectively prevent moisture from entering the system and avoid corrosion, icing or microbial growth.

[0003] Additive manufacturing, also known as 3D printing, is a manufacturing technology that builds three-dimensional entities by layering materials. Unlike traditional subtractive manufacturing, additive manufacturing is based on digital models, which decompose complex three-dimensional geometries into two-dimensional sections, and then manufacture entities by layering materials. This technology can achieve highly complex structure design, reduce material waste and shorten production cycle.

[0004] In combination with the characteristics of existing aircraft desiccant tubes:

[0005] Moisture absorption: absorbs moisture in the air to prevent water vapor from entering the fuel tank, hydraulic system, etc.

[0006] Filter impurities: some desiccant tubes have filtering function to block particulate pollutants.

[0007] Extend the life of oil: reduce the degradation of lubricating oil and hydraulic oil caused by moisture.

[0008] Prevent icing: avoid system failure caused by water icing in low temperature environment.

[0009] The existing desiccant tube is directly made of metal pipe material by pressing and molding. If the pipe wall is thick, it will affect the normal use of the desiccant tube. If the pipe wall is thin, it will affect the service life of the desiccant tube. The metal material of the metal desiccant tube is generally only one kind of metal material. When applied to high-speed aircraft, it is difficult to meet the actual needs of the aircraft: the desiccant tube needs to withstand high temperature, has good impact resistance and vibration resistance, and meets the required hardness, strength, toughness, corrosion resistance, etc. This will make the existing aircraft desiccant metal pipe manufacturing process have the following defects:

[0010] 1. It is difficult to meet the above requirements by using one kind of metal material to make the desiccant metal tube, which may cause problems such as toughness and hardness. If multiple metal materials are used for stacking, i.e. wrapping or being wrapped, it may be difficult to fix the two desiccant tubes together or they may fall off easily.

[0011] 2. The need to use at least two processes to make: first to make the pipe body, and then to make the dry structure separately according to the actual application scene, and finally to install the dry structure in the pipe, which will make it difficult for the dry structure (such as a desiccant of non-metallic material) to be connected with the metal material, and it is easy to make the desiccant have insufficient force points and force areas, because the inner wall area of the drying pipe is fixed, and if the desiccant is loaded too much, it will affect the flow speed and flow of the gas or liquid, and if it is loaded too little, it will affect the drying effect.

[0012] The stress of the dry metal pipe at each point is also different when it is actually installed or used, such as the stress at the connection of the head and tail, which is stronger than the stress at the middle section of the pipe, but the pipe made of the same metal material in the prior art has a stress limit that is consistent and changes simply with the change of the shape of the pipe, and it is difficult to make targeted improvements according to the actual stress. SUMMARY

[0013] Based on the existing technical problems, the present application provides an aircraft drying metal pipe drying flow channel and a flow channel 3D printing process.

[0014] The aircraft drying metal pipe drying flow channel provided by the present application comprises a pipe body shell manufactured by additive manufacturing, and the inner wall of the pipe body shell is provided with a pipe wall manufactured by additive manufacturing.

[0015] The inner wall of the pipe wall is formed by a plurality of molecular structures arranged along the center line of the pipe body shell.

[0016] Preferably, the shape of the pipe wall comprises a polygonal shape, and the polygonal shape comprises any one or a combination of any shape of a triangle, a quadrilateral, a pentagon, and a hexagon.

[0017] Through the above technical solution, the polygonal pipe wall can make the aircraft drying metal pipe have more styles of flow channels.

[0018] Preferably, the molecular structure comprises any one or a combination of a hollow tetrahedron and a methane-like molecular structure.

[0019] Through the above technical solution, the tetrahedron and the methane-like molecular structure both have high stability and uniform stress.

[0020] Preferably, the powder material of the additive manufacturing is any one or a combination of any component of titanium alloy, aluminum alloy, stainless steel, or high-temperature alloy.

[0021] Through the above technical solution, different materials can be selected according to different stress requirements, application scenes, and connection requirements.

[0022] A 3D printing process of an aircraft drying metal pipe drying flow channel, comprising:

[0023] Step one, establish a drying metal pipe geometric model.

[0024] Step two, label the geometric model data parameters.

[0025] Step three, construct a geometric -material -mechanical mapping relationship dataset of the geometric-material model.

[0026] Step four, construct a verification model, and verify the geometric -material -mechanical mapping relationship dataset.

[0027] Step five, obtain additive manufacturing parameters.

[0028] Step six, convert the geometric model additive manufacturing parameters and input them into the additive manufacturing equipment recognizable parameters before additive manufacturing.

[0029] Preferably, in step two, the irrelevant parameters of the geometric model in step one are removed, and the geometric parameters of the pipe body shell and the pipe wall are labeled out. Among them, is the geometric shape; is the wall thickness.

[0030] Through the above technical solution, the irrelevant parameters include reasonable simplification of the secondary factors with less influence. Common simplification measures include deleting or closing the structure details such as chamfer, bolt hole, nameplate groove, and small fillet which do not participate in the main stress.

[0031] Preferably, in step three, according to the geometric parameters in step two and the force that the regular tetrahedron and the methane-like molecular structure can withstand under each additive manufacturing powder material, the geometric parameters and the geometric -material model of each additive manufacturing powder material are obtained. Additive manufacturing porous structure diagram.

[0032] The material includes , or any combination of the two.

[0033] Through the above technical solution, each of the regular tetrahedron and the methane-like molecular structure corresponds to the material The force required at all positions of the pipe wall can be known by marking the pipe wall geometry model, and the wall thickness required at all positions of the pipe wall can be known, so that the material required at the position can be easily calculated The type and size of the material can be known.

[0034] Preferably, according to the geometry - material The geometry - material - mechanics Mapping relationship data points , wherein ;

[0035] The data points are constituted into a data set.

[0036] According to the above technical solution, according to the shape, wall thickness, material type and force corresponding to each position of the geometry model , the geometry model shape and wall thickness are associated with the material and force one by one to constitute a data set.

[0037] Preferably, the geometry - material - mechanics Mapping relationship data set is input to the verification model for verification processing.

[0038] The verification processing includes: S1, the material According to the shape and wall thickness of the geometry , the , or two combinations are selected in order from small to large, and the geometry - material - mechanics Mapping relationship data points are obtained, and then the geometry is arrayed along the shape and wall thickness.

[0039] S2, according to the mapping relationship data points after each array, the geometry shape, wall thickness, material type and force value of the data points are reversely mapped.

[0040] S3, when the geometry parameters shape and wall thickness of the arrayed mapping relationship data points are all greater than the geometry When the data point meets the shape, wall thickness, material and force requirements of the initial geometric model, the parameters of the additive manufacturing are finally obtained.

[0041] S4, according to the mapping relationship data point geometric parameters The mapping relationship of the other two parameters in the mapping relationship data point is obtained correspondingly. And .

[0042] According to the above technical scheme, each data point in the data set is compared in order from small to large until the data point meets the shape, wall thickness, material and force requirements of the initial geometric model, and finally the parameters of the additive manufacturing are obtained.

[0043] Preferably, in step five, according to the parameters of the mapping relationship data point in step S4, the data points are fitted: the excess edge corners in the data points are removed and transitioned, and finally the geometric - material - mechanical parameters are changed inversely, and the target dry metal pipe geometric model is manually saved before the additive manufacturing of step six.

[0044] According to the above technical scheme, the fitting of the data points is to make the outer surface of the additive manufactured aircraft dry metal pipe smoother.

[0045] The beneficial effects in the present application are:

[0046] 1. By setting the inner wall of the pipe wall to be composed of a plurality of molecular structure arrays, the internal structure of the aircraft dry metal pipe can be divided into a plurality of "bricks" with uniform shape, and according to the force and wall thickness of the aircraft dry metal pipe, the material and size of the "bricks" can be modified according to the actual situation, and the molecular structure can reduce the amount of additive material on the basis of stable force, meet the requirements of moisture absorption, impurity filtration, oil life extension and ice prevention of the aircraft dry metal pipe, and achieve the effect of light weight.

[0047] 2. By setting the 3D printing process of the aircraft dry metal pipe drying channel, the additive manufacturing can have the effect of automation, the electronic drawing of the geometric model is input, the shape and wall thickness data of each position of the structure are automatically divided and labeled, and then the material meeting the force requirement is automatically selected according to the force requirement, and finally the electronic drawing data format of the additive manufacturing device can be automatically converted to the electronic drawing data format of the additive manufacturing device, and the additive manufacturing is carried out. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 A schematic diagram of an aircraft dry metal pipe drying channel is provided in the present application; ​

[0049] Figure 2 A polygonal side view of a pipe wall of an aircraft drying metal pipe drying flow channel is proposed in the present application;

[0050] Figure 3 A tetrahedron additive manufacturing perspective view of an aircraft drying metal pipe drying flow channel is proposed in the present application;

[0051] Figure 4 A methane-like molecular structure additive manufacturing perspective view of an aircraft drying metal pipe drying flow channel is proposed in the present application;

[0052] Figure 5 A pipe body shell front view of an aircraft drying metal pipe drying flow channel is proposed in the present application;

[0053] Figure 6 Data points of a 3D printing process of an aircraft drying metal pipe drying flow channel are proposed in the present application Schematic view.

[0054] In the figure: 1, pipe body shell; 2, pipe wall; 21, tetrahedron; 22, methane-like molecular structure; 23, transition arc. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0056] Embodiment 1

[0057] Reference Figures 1-5 An aircraft drying metal pipe drying flow channel, as shown in Figure 1 , includes a pipe body shell 1 manufactured by additive manufacturing, and the inner wall of the pipe body shell 1 is provided with a pipe wall 2 manufactured by additive manufacturing.

[0058] As shown in Figure 2 , in order to make the pipe wall 2 have stronger stress and flow channel, the inner wall of the pipe wall 2 is arranged to be arrayed by a plurality of molecular structures along the center line of the pipe body shell. The shape of the pipe wall 2 includes a polygonal shape, and the polygonal shape includes any one or more shapes of a triangle, a quadrilateral, a pentagon, and a hexagon in any combination. The polygonal pipe wall 2 can make the aircraft drying metal pipe have more diversified flow channels. The original structure with only the pipe wall 2 shell is changed to a pipe wall 2 flow channel with multiple support structures, so that the aircraft drying metal pipe has stronger stress.

[0059] As shown in Figures 3-5As shown, in order to make the flow channel in the pipe wall 2 achieve lightweight on the basis of supporting strength and the effect of pore flow channel, the quasi-molecular structure includes any one or a combination of both of the hollow tetrahedron 21 and the quasi-methane molecular structure 22. Both the tetrahedron 21 and the quasi-methane molecular structure 22 have the advantages of high stability and uniform stress.

[0060] Further, the powder material of the additive manufacturing is any one or any component combination of multiple of titanium alloy, aluminum alloy, stainless steel or high-temperature alloy. Different materials can be selected according to different stress requirements, application scenarios and connection requirements, such as Figure 5 As shown, when the pipe wall 2 needs to bear a larger stress, only the array size and density here need to be adjusted.

[0061] By setting the inner wall of the pipe wall 2 to be composed of a plurality of quasi-molecular structure arrays, the internal structure of the aircraft drying metal pipe can be divided into a plurality of uniform-shaped "bricks". According to the stress and wall thickness of the aircraft drying metal pipe, the material and size of the "bricks" can be modified according to the actual situation. The quasi-molecular structure reduces the amount of additive material on the basis of stable stress. Since it is integrally formed by additive manufacturing, there is no problem of falling off after being pressed and installed by multiple materials. At the same time, it meets the requirements of moisture absorption, impurity filtration, oil life extension, and ice prevention of the aircraft drying metal pipe, and also achieves the effect of lightweight. Dryer can also be added according to actual needs. Only the particle diameter of the dryer is greater than the pore size of the quasi-molecular structure. In this way, the flow is not hindered by the large density of the dryer, and the force point and area of the dryer are also increased. Even if the stress is large in some places, it still has the effect of flow due to the pores inside the quasi-molecular structure.

[0062] Embodiment 2

[0063] Referring to Figure 1 and Figures 5-6 , a 3D printing process of an aircraft drying metal pipe drying flow channel, as Figure 1 shown, includes;

[0064] Step 1, establishing a drying metal pipe geometric model. Constructed by a three-dimensional modeling software, and then according to the requirements, the geometric model is exported into a corresponding file format.

[0065] Step 2, labeling the geometric model data parameters.

[0066] In order to reduce the influence of too many parts on the additive manufacturing process, in the step 2, the irrelevant parameters of the geometric model in the step 1 are removed, and the geometric parameters of the pipe body shell 1 and the pipe wall 2 are labeled out. Among them, is the geometric shape; The wall thickness is irrelevant. The irrelevant parameters include reasonable simplification of secondary factors that have less impact. Common simplification measures include deleting or closing the structure details such as chamfer, bolt hole, nameplate groove, small fillet, etc. which do not participate in the main force.

[0067] In order to be able to define the printing material properties of additive manufacturing, the geometry of step three, the geometry-material model is set - material - mechanics Mapping relationship data set.

[0068] In step three, according to the geometric parameters in step two And the corresponding force that the regular tetrahedron 21 and the methane-like molecular structure 22 can withstand under each additive manufacturing powder material is known, the geometric parameters The geometry of each additive manufacturing powder material - material Model of additive manufacturing porous structure diagram.

[0069] The material includes , Or any combination of the two.

[0070] The geometric model can be set as a STEP file format, and the exported STEP file is imported into Ansys workbench for model simplification. Other parts needed for later assembly of the dry metal pipe are modeled separately as a part. Ignore the small size hole and groove structure. The elastic modulus, density and tensile strength parameters related to material mechanics of the corresponding titanium alloy, aluminum alloy, stainless steel or high-temperature alloy material are analyzed. Subsequently, according to the actual situation of the regular tetrahedron 21 and the methane-like molecular structure 22, fixed support constraints are generated.

[0071] The force of each regular tetrahedron 21 and the methane-like molecular structure 22 corresponding to the material Is fixed, and through the pipe wall 2 geometric model marking, the required force value and wall thickness at all positions of the pipe wall 2 can be known, so that the type and size of the material At this position can be easily calculated, that is, the fixed support constraint.

[0072] As Figures 5-6 shown, in order to form effective additive manufacturing data, according to the geometry - material Model of additive manufacturing porous structure diagram, generate geometric - material - mechanics Mapping relationship data points , wherein, ;

[0073] The data points Reconstruct the data set. According to the shape, wall thickness of each position in the geometric model, the corresponding material category and the force received by the material , the data set can be constructed according to the shape of the geometric model and the wall thickness corresponding to the material and the force.

[0074] Step four, build a verification model, and verify the geometric -material -mechanical mapping relationship data set.

[0075] Further, the geometric -material -mechanical mapping relationship data set is input to the verification model for verification processing.

[0076] The verification processing includes: S1, the material According to the shape and wall thickness of the geometric , select the , or two combinations in ascending order, get the geometric -material -mechanical mapping relationship data points , and then array along the shape and wall thickness of the geometric .

[0077] S2, according to the mapping relationship data points after each array, the geometric shape wall thickness, material category and force value in the data points are inversely mapped.

[0078] S3, when the geometric parameters shape and wall thickness of the arrayed mapping relationship data points are all greater than the geometric of the geometric model data in step two, the next step is performed, otherwise steps S1-S2 are repeated. That is, whether the fixed support constraint condition corresponding to each said regular tetrahedron 21 and said methane-like molecular structure 22 meets the support requirement, if it meets, the next step is executed; if it does not meet, steps S1-S2 are repeatedly executed.

[0079] S4, according to the mapping relationship of the mapping relationship data points geometric parameters , the other two parameters in the mapping relationship data points are correspondingly obtained as well as The data points in the dataset are compared one by one in ascending order until the last data point is reached. The parameters for additive manufacturing are finally derived by satisfying the shape, wall thickness, material, and stress requirements of the initial geometric model.

[0080] Step 5: Obtain additive manufacturing parameters.

[0081] Furthermore, in step five, based on the mapping relationship data points in step S4... The parameters are used to fit the data points: such as Figure 6 As shown, the data points are... Excess edges and corners are removed or transitional arcs are used (23), and finally, the geometry is transformed inversely. -Material -Mechanics The parameters are manually saved, and the geometric model of the target dry metal tube is then used for additive manufacturing in step six. The data point fitting is to make the outer surface of the additively manufactured aircraft dry metal tube smoother.

[0082] Step 6: Convert the geometric model additive manufacturing parameters and input them into the additive manufacturing equipment to form identifiable parameters before proceeding with additive manufacturing.

[0083] By setting up a 3D printing process for the drying flow channel of aircraft drying metal pipes, additive manufacturing can be automated. The electronic drawings of the geometric model are input, and the shape and wall thickness data of each part of the structure are automatically separated and labeled. Then, the material that meets the stress conditions is automatically selected according to the stress requirements. Finally, it is automatically converted into an electronic drawing data format that can be recognized by additive manufacturing equipment for additive manufacturing.

[0084] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drying flow channel for an aircraft drying metal tube, comprising a tube shell (1) manufactured by additive manufacturing, characterized in that: The inner wall of the outer shell (1) of the tube body is provided with a tube wall (2) manufactured by additive manufacturing. The inner wall of the tube wall (2) is formed by an array of multiple molecular-like structures along the midline of the outer shell of the tube.

2. The drying flow channel for an aircraft drying metal tube according to claim 1, characterized in that: The shape of the pipe wall (2) includes a polygonal shape, which includes any combination of one or more shapes such as triangle, quadrilateral, pentagon and hexagon.

3. The drying flow channel for an aircraft drying metal tube according to claim 2, characterized in that: The molecular-like structures include any one or a combination of two of the following: hollowed-out tetrahedrons (21) and methane-like molecular structures (22).

4. The drying flow channel for an aircraft drying metal tube according to claim 3, characterized in that: The additive manufacturing powder material is any one or more of titanium alloy, aluminum alloy, stainless steel or high-temperature alloy, and any combination of components.

5. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 4, characterized in that: include; Step 1: Establish the geometric model of the drying metal tube; Step 2: Label the geometric model data parameters; Step 3: Constructing the geometry of the geometry-material model -Material -Mechanics Mapping relationship dataset; Step 4: Construct a verification model for the geometry. -Material -Mechanics The mapping relationship dataset is validated. Step 5: Obtain additive manufacturing parameters; Step 6: Convert the geometric model additive manufacturing parameters and input them into the additive manufacturing equipment to form identifiable parameters before proceeding with additive manufacturing.

6. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 5, characterized in that: In step two, irrelevant parameters of the geometric model described in step one are removed, and then the geometric parameters of the outer shell (1) and the pipe wall (2) are removed. Mark it; in, It is a geometric shape; The wall thickness is [not specified].

7. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 6, characterized in that: In step three, based on the geometric parameters from step two... Given the known forces that the tetrahedron (21) and the methane-like molecular structure (22) can withstand under various additive manufacturing powder materials, the geometric parameters are obtained. Geometry of various additive manufacturing powder materials -Material Diagram of the additive manufacturing porous structure of the model; The material include , Or any combination of the two.

8. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 7, characterized in that: According to the geometry -Material Additive manufacturing porous structure diagram of the model, generating geometry -Material -Mechanics Mapping relationship data points ,in, ; The data points Reconstruct the dataset.

9. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 8, characterized in that: The geometry -Material -Mechanics The mapping relationship dataset is input into the verification model for verification processing; The verification process includes: S1, the material According to the geometry The shape and wall thickness are selected in ascending order. , Or a combination of the two, to obtain geometry -Material -Mechanics Mapping relationship data points Then along the geometry The shape and wall thickness are arrayed; S2. Based on the mapping relationship data points after each array... Reverse mapping of data points geometry in Shape, wall thickness, material Types and forces The value; S3, Geometric parameters of the mapping relationship data points after arraying The shape and wall thickness are both greater than the geometric model data in step two. If the condition is met, proceed to the next step; otherwise, repeat steps S1-S2. S4. Geometric parameters of data points based on mapping relationship The mapping relationship is used to obtain the other two parameters in the mapping relationship data points. as well as .

10. The 3D printing process for a drying flow channel of an aircraft drying metal tube according to claim 9, characterized in that: In step five, the mapping relationship data points from step S4 are used. The parameters are used to fit the data points: the data points are... Excess edges and corners are removed and transitioned, and finally, the geometry is transformed inversely. -Material -Mechanics After manually saving the geometric model of the target dry metal tube, proceed with the additive manufacturing described in step six.

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