CN113280022A - Connecting joint of heterogeneous material gradient structure and preparation method thereof - Google Patents
Connecting joint of heterogeneous material gradient structure and preparation method thereof Download PDFInfo
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- CN113280022A CN113280022A CN202110407316.2A CN202110407316A CN113280022A CN 113280022 A CN113280022 A CN 113280022A CN 202110407316 A CN202110407316 A CN 202110407316A CN 113280022 A CN113280022 A CN 113280022A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B1/00—Devices for securing together, or preventing relative movement between, constructional elements or machine parts
- F16B1/02—Means for securing elements of mechanisms after operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
Abstract
The invention provides a heterogeneous material gradient structure connecting joint and a preparation method thereof, relating to the technical field of material connection and comprising the following steps: connecting portion, first mother material portion and second mother material portion, wherein, connecting portion include the first gradual change structure and the second gradual change structure of mutual gomphosis, the one end that is close to first gradual change structure at connecting portion is connected to first mother material portion, the one end of keeping away from first mother material portion at connecting portion is connected to second mother material portion, and the material of second mother material portion is the same with the material of second gradual change structure, in the direction of keeping away from first mother material portion of connecting portion, the space density of first gradual change structure reduces gradually, the space density of second gradual change structure increases gradually. So that the structures of different materials can form a gradient transition structure at the connecting part, thereby realizing the transition of material performance, avoiding the sudden change of the materials of different materials at the connecting part, further enhancing the connecting strength of dissimilar materials, and simultaneously providing a preparation method of the connecting joint of the gradient structure of the dissimilar materials.
Description
Technical Field
The invention relates to the technical field of material connection, in particular to a heterogeneous material gradient structure connection joint and a preparation method thereof.
Background
Engineering often requires joining different materials together in order to achieve a particular functionality. However, because the two materials have mismatched properties, a large interfacial stress is generated during the bearing process, which easily causes the interface to break.
In the related art, the traditional schemes for connecting dissimilar materials are mechanical connection, welding and the like, which all have considerable defects. Mechanical connections, such as screws and nuts, can locally weaken the strength of the base material structure, and have strict space limitations and design requirements at the connection portions. And the welding of dissimilar metal materials can generate brittle phases such as intermetallic compounds and the like, and the connection strength is seriously weakened.
Disclosure of Invention
The embodiment of the invention provides a heterogeneous material gradient structure connecting joint and a preparation method thereof, aiming at improving the connecting strength of heterogeneous materials.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a heterogeneous material gradient structure connection joint, including:
the connecting part comprises a first gradual change structure and a second gradual change structure which are mutually embedded, and the first gradual change structure and the second gradual change structure are made of different materials;
the first base material part is connected to one end, close to the first gradual change structure, of the connecting part, and the material of the first base material part is the same as that of the first gradual change structure;
a second base material portion connected to an end of the connecting portion, the end being away from the first base material portion, the second base material portion being made of the same material as the second gradual change structure;
in the direction of keeping away from the first parent metal portion of connecting portion, the space density of first gradual change structure reduces gradually, the space density of second gradual change structure increases gradually.
Optionally, the melting point of the material of the first graded structure is higher than the melting point of the material of the second graded structure;
the first gradual change structure comprises a plurality of connecting rods, and the connecting rods are staggered to form a first lattice structure;
the second gradual change structure wraps the first lattice structure and fills gaps of the first lattice structure;
in a direction away from the first parent material portion, the rod diameter of the connecting rod is gradually reduced so that the spatial density of the first gradual change structure is gradually reduced and the spatial density of the second gradual change structure is gradually increased.
In a second aspect, an embodiment of the present invention provides a method for preparing a connection joint with a heterogeneous material gradient structure, where the method is used to prepare the connection joint with a heterogeneous material gradient structure according to the first aspect, and the method includes:
drawing a corresponding CAD model according to the first parent material part, the first gradual change structure and the material characteristics of the first gradual change structure;
obtaining the first parent material part and the first gradient structure by adopting a 3D printing process according to the materials of the first parent material part and the first gradient structure and the corresponding CAD model;
placing the first parent material portion and the first transition structure into a casting mold of a corresponding size, wherein the first transition structure is on an upper portion of the first parent material portion;
heating and melting the materials of the second mother material part and the second gradual change structure to obtain pouring liquid;
the pouring liquid is pretreated, and the pretreated pouring liquid is poured into a pouring mold with the first mother material part and the first gradual change structure, so that the pouring liquid is soaked into gaps of the first gradual change structure, and a gradient lattice connection structure containing heterogeneous materials is formed;
and cooling and solidifying to obtain the heterogeneous material gradient structure connecting joint comprising the connecting part, the first mother material part and the second mother material part.
Optionally, obtaining the first parent material portion and the first gradient structure by using a 3D printing process according to the materials of the first parent material portion and the first gradient structure and the corresponding CAD model, includes:
converting the CAD model corresponding to the first parent material part and the first gradual change structure into an STL file, and importing the STL file into slicing software;
determining corresponding 3D printing parameters according to the material characteristics and the geometric characteristics of the first parent material part and the first gradient structure to obtain a slice file;
adding the first parent material part and powder corresponding to the material of the first gradual change structure into 3D printing equipment, and performing printing preparation work;
importing the slice file into 3D printing equipment, and carrying out selective laser melting processing to obtain an initial first parent part and a first gradual change structure;
and taking the initial first parent material part and the first gradual change structure off the substrate, and processing to obtain the first parent material part and the first gradual change structure.
Optionally, before the step of adding the first parent material portion and the powder corresponding to the material of the first gradation structure into the 3D printing apparatus, the method further comprises:
and drying and screening the powder corresponding to the first parent material part and the material of the first gradual change structure to control the particle size of the powder and reduce the humidity of the powder.
Optionally, the step of performing print preparation includes at least:
polishing the substrate, roughly adjusting a scraper, finely adjusting the position of the platform and providing an inert gas atmosphere.
Optionally, the importing the slice file into a 3D printing device, and performing selective laser melting processing to obtain an initial first parent material portion and a first gradual change structure, including:
importing the slice file into 3D printing equipment for selective laser melting processing;
and introducing air into the 3D printing equipment, releasing inert gas, taking a piece, and carrying out heat treatment to obtain an initial first mother material part and a first gradual change structure.
Optionally, removing the initial first mother material portion and the first grading structure from the substrate, and processing the first mother material portion and the first grading structure to obtain a first mother material portion and a first grading structure, including:
and taking the initial first mother material part and the first gradient structure off the substrate through a wire cutting process, and carrying out surface treatment, cleaning and blow-drying to obtain the first mother material part and the first gradient structure.
Optionally, the pouring liquid is pretreated, including:
and preserving heat of the pouring liquid for later use, wherein the heat preservation temperature is lower than the melting point of the material with the first gradual change structure.
Optionally, the 3D printing process includes, but is not limited to, one of:
selective laser melting forming, electric arc additive manufacturing, electron beam additive manufacturing and photocuring forming.
Adopt the heterogeneous material gradient structure attach fitting that this application provided, include: connecting portion, first mother material portion and second mother material portion, wherein, connecting portion include the first gradual change structure and the second gradual change structure of mutual gomphosis, and the material of first gradual change structure and second gradual change structure is different, and first mother material portion connects the one end that is close to first gradual change structure at connecting portion, and the material of first mother material portion with the material of first gradual change structure is the same, and the one end of keeping away from first mother material portion on connecting portion is connected to second mother material portion, and the material of second mother material portion is the same with the material of second gradual change structure, and in the direction of keeping away from first mother material portion of connecting portion, the space density of first gradual change structure reduces gradually, and the space density of second gradual change structure increases gradually. So that the structures of different materials can form a gradient transition structure at the connecting part, thereby realizing the transition of material performance, avoiding the sudden change of the materials of different materials at the connecting part and enhancing the connecting strength of dissimilar materials.
By adopting the preparation method of the heterogeneous material gradient structure connecting joint, the first mother material part with the higher melting point and the first gradient structure are printed out through the 3D printing process, and the second mother material part with the lower melting point and the second gradient structure are filled in the gap of the first gradient structure through a pouring mode, so that the heterogeneous material gradient structure connecting joint with the gradient structure is obtained, and the connecting strength of the connecting joint is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a heterogeneous material gradient structure connection joint according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first graded structure of a hetero material gradient structure connection joint according to an embodiment of the present invention;
FIG. 3 is a schematic plan cross-sectional view of a first grading structure in an embodiment of the invention;
FIG. 4 is another schematic plan cross-sectional view of a first grading structure in an embodiment of the invention;
FIG. 5 is a schematic view illustrating the pouring of a heterogeneous material gradient structure connection joint according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a heterogeneous material gradient structure connection joint after casting is completed according to an embodiment of the present invention.
Description of reference numerals:
1-first mother part, 2-second mother part, 3-connecting part, 31-first gradual change structure, 32-second gradual change structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Engineering often requires joining different materials together. However, because the two materials have mismatched properties, a large interfacial stress is generated during the bearing process, which easily causes the interface to break. To solve this problem, a material gradient transition concept has been proposed to reduce the interfacial stress by the gradient transition of the material composition. However, this method is difficult to prepare and regulate the ingredients. To this end, the project proposes a new solution for implementing performance transition based on structure transition.
In the related art, the traditional schemes for connecting dissimilar materials are mechanical connection, welding and the like, which all have considerable defects. Mechanical connections, such as screws and nuts, can locally weaken the strength of the base material structure, and have strict space limitations and design requirements at the connection portions. And the welding of dissimilar metal materials can generate brittle phases such as intermetallic compounds and the like, and the connection strength is seriously weakened.
In order to overcome the problems, the application provides a heterogeneous material gradient structure connection joint and a preparation method thereof, and aims to provide a heterogeneous material gradient structure connection joint with a gradual change structure, so that the transition of material performance is realized, and the mutation of materials of different materials at the joint is avoided, thereby enhancing the connection strength of heterogeneous materials. The interlocking structure of the technology can improve the interface strength.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a heterogeneous material gradient structure connection joint according to an embodiment of the present invention, and as shown in fig. 1, the heterogeneous material gradient structure connection joint includes:
a connecting part 3, wherein the connecting part 3 comprises a first gradual change structure 31 and a second gradual change structure 32 which are mutually embedded, and the materials of the first gradual change structure 31 and the second gradual change structure 32 are different;
a first mother material part 1, wherein the first mother material part 1 is connected to one end of the connecting part 3 close to the first gradual change structure 31, and the material of the first mother material part 1 is the same as that of the first gradual change structure 31;
a second mother material part 2, the second mother material part 2 being connected to an end of the connecting part 3 away from the first mother material part 1, and a material of the second mother material part 2 being the same as a material of the second gradation structure 32;
in a direction of the connecting portion 3 away from the first parent material portion 1, the spatial density of the first gradually-varying structure 31 gradually decreases, and the spatial density of the second gradually-varying structure 32 gradually increases.
In the present embodiment, a connecting portion 3 with gradually changed material is disposed between the first parent material portion 1 and the second parent material portion 2, wherein one end of the first parent material portion 1 far away from the connecting portion 3 is used for connecting the structure same as the material of the first parent material portion 1, one end of the second parent material portion 2 far away from the connecting portion 3 is used for connecting the structure same as the material of the second parent material portion 2, so that the structures of two different materials form a gradient transition structure at the connecting portion 3, specifically, the connecting portion 3 comprises a first gradient structure 31 and a second gradient structure 32 which are embedded with each other, the materials of the first gradient structure 31 and the second gradient structure 32 are different, the first parent material portion 1 is connected at one end of the connecting portion 3 close to the first gradient structure 31, the material of the first parent material portion 1 is the same as the material of the first gradient structure 31, the second parent material portion 2 is connected at one end of the connecting portion 3 far away from the first parent material portion 1, and the material of second mother portion 2 is the same with the material of second gradual change structure 32, in the direction of keeping away from first mother portion 1 of connecting portion 3, the space density of first gradual change structure 31 reduces gradually, and the space density of second gradual change structure 32 increases gradually to the structure that can make different materials forms the excessive structure of gradient at connecting portion 3, thereby realizes the transition of material performance, has avoided the sudden change of different materials at the junction material, thereby strengthens dissimilar material's joint strength.
Based on the above connection joint with the heterogeneous material gradient structure, the present application provides the following specific examples, which can be arbitrarily combined to form a new connection joint with the heterogeneous material gradient structure without mutual conflict. It should be understood that a new type of dissimilar material gradient structure joint formed by any combination of the examples is within the scope of the present application.
The geometric design of the existing structure connection interface is mostly two-dimensional design, the structure shows obvious anisotropy when loaded, the shear strength anisotropy of the joint is large, the joint can be sheared in only one direction, and the use occasion of the structure is limited. And the two-dimensional geometric interface design can not fully expand the interface area, and the improvement on the dissimilar metal connection strength is limited.
Referring to fig. 1 to 4, fig. 2 is a schematic diagram of a first graded structure of a heterogeneous material gradient structure connection joint according to an embodiment of the present invention, fig. 3 is a schematic plan sectional view of a first graded structure according to an embodiment of the present invention, fig. 4 is a schematic plan sectional view of a first graded structure according to an embodiment of the present invention, in a possible embodiment, a melting point of a material of the first graded structure 31 is higher than a melting point of a material of the second graded structure 32;
the first gradual change structure 31 comprises a plurality of connecting rods, and the connecting rods are staggered to form a first lattice structure;
the second graded structure 32 wraps around the first lattice structure and fills the voids of the first lattice structure;
in a direction away from the first parent material portion 1, the rod diameter of the connecting rod gradually decreases so that the spatial density of the first gradually varying structure 31 gradually decreases and the spatial density of the second gradually varying structure 32 gradually increases.
In this embodiment, the melting point of the material of the first graded structure 31 is higher than the melting point of the material of the second graded structure 32, so as to facilitate the preparation of the heterogeneous material gradient structure connection joint, wherein the first graded structure 31 comprises a plurality of connecting rods, and the connecting rods are staggered in a certain arrangement order in a three-dimensional space to form a first lattice structure, and the first lattice structure has interconnected gaps therein, such as three-dimensional array arrangement, and then the second graded structure 32 wraps the first lattice structure and fills the gaps of the first lattice structure, wherein the rod diameter of the connecting rods is gradually reduced in a direction away from the first parent material portion 1, and at this time, the gaps of the first lattice structure formed by the connecting rods are gradually increased, so that the spatial density of the first graded structure 31 is gradually reduced and the spatial density of the second graded structure 32 is gradually increased in a direction away from the first parent material portion 1, so that the structures of different materials can form a gradient transition structure at the connecting part 3, thereby realizing the transition of material performance, avoiding the sudden change of the materials of different materials at the connecting part and further enhancing the connecting strength of dissimilar materials.
The material performance transition is realized through the gradient transition on the structure level to make the xenogenesis material interface stress distribution more even at deformation in-process, can let the parent metal participate in the anti-damage action of joint again through the geometric morphology of design joint interface, hinder the crack propagation, improve joint mechanical properties comprehensively. The obtained joint structure has macroscopic isotropy, can bear shearing force in all directions, and has better performance and wider application.
As shown in fig. 1, the "gradient lattice" dissimilar material connection scheme of the present application sequentially includes a first parent material portion, a connection portion, and a second parent material portion, and the gradient lattice structural features are shown in fig. 2 to 4. In the connecting part, the basic geometric configuration of the first gradual change structure is a lattice structure, and the diameter of the control rod is gradually changed to obtain a gradient structure, namely a gradient lattice configuration. The second gradient structure is wrapped and filled with the gradient lattice structure, and the two materials are embedded and jointed to form a gradient lattice connector.
Taking metal as an example, the heterogeneous metal base material is processed into a gradient lattice structure by using a 3D printing process according to the melting point and the melting point of the heterogeneous metal base material. And cladding and filling the low-melting-point metal on the formed gradient dot matrix to enable the two metals to be tightly jointed, thereby completing the complete manufacturing process of the gradient dot matrix connector. The specific operation steps are as follows:
there are many technical approaches to metal 3D printing, and Selective Laser Melting (SLM) is used as an example for illustration. The SLM technology is a new digital manufacturing technology based on Selective Laser Sintering (SLS), and metal powder is melted by laser beam and is built up layer by layer to be shaped. Processing the high-melting-point metal component into a gradient lattice rigid frame (namely a first lattice structure) by an SLM (selective laser melting) technology; and casting a low-melting-point metal component on the lattice rigid frame, wrapping the periphery of the lattice, and filling gaps of the lattice to form a complete joint structure.
The design concept of the "gradient lattice" linker has two advantages.
Firstly, through the modeling design of a lattice structure, two parent metals form a geometrical mosaic relationship, the lattice structure of a high-melting-point material is embedded into a low-melting-point material to complete the locking connection joint, and the interface area of a connecting surface is greatly increased. And the lattice structure has the characteristics of light weight and high strength, and can further strengthen the connection strength of the joint interface.
Secondly, through the transition design of a gradient structure, the parent metal completes the transition of space density in the connecting part, and the rigidity and the strength of the lattice structure synchronously complete the transition. As shown in fig. 4, the spatial density of the first gradually-varying structure gradually decreases in the growth direction of the first gradually-varying structure (i.e., in the direction away from the first base material portion), and accordingly, the joint structure is mainly supported by the first base material, and is transitionally shifted to be mainly supported by the second base material. Therefore, in the bearing process, the obvious difference of the performances of the two materials is avoided, the obvious phenomenon of high stress at the interface is avoided, the performances of the base material are fully utilized, and the strength of the connector is improved to the maximum extent.
The finally obtained heterogeneous material gradient structure connecting joint has the following advantages:
(1) the gradient lattice structure can weaken high stress of a dissimilar material interface, and simultaneously greatly improve various properties of the dissimilar metal connector, such as tensile property, shear resistance, plasticity, energy consumption property and the like, and has extremely wide application value.
(2) The gradient lattice connector has macroscopic isotropy, and the shearing resistance performance is not greatly different in different directions, so that the joint structure can be suitable for more complicated working conditions.
(3) The design concept of the gradient lattice joint can be applied to most of heterogeneous metal connection occasions, and only the configuration of geometric parameters is finely adjusted according to material parameters.
(4) The method is not limited to connecting dissimilar metals, and the idea is also applicable to connecting dissimilar non-metals, or metals and non-metals.
Based on the above heterogeneous material gradient structure connection joint, the application provides a preparation method of a heterogeneous material gradient structure connection joint, the method includes:
step S1: drawing a corresponding CAD model according to the first parent material part, the first gradual change structure and the material characteristics of the first gradual change structure;
in this embodiment, the dimensions of the first base material portion and the first gradient structure are designed according to the structures to be connected and the material characteristics thereof, and the corresponding CAD model is drawn according to the first base material portion and the first gradient structure.
Step S2: obtaining the first parent material part and the first gradient structure by adopting a 3D printing process according to the materials of the first parent material part and the first gradient structure and the corresponding CAD model;
in this embodiment, the first parent material portion and the first gradation structure can be printed out by using the materials corresponding to the first parent material portion and the first gradation structure and the required material usage amount and by using a 3D printing process.
Specifically, in one possible implementation, step S2 may include the following steps:
converting the CAD model corresponding to the first parent material part and the first gradual change structure into an STL file, and importing the STL file into slicing software;
determining corresponding 3D printing parameters according to the material characteristics and the geometric characteristics of the first parent material part and the first gradient structure to obtain a slice file;
adding the first parent material part and powder corresponding to the material of the first gradual change structure into 3D printing equipment, and performing printing preparation work;
importing the slice file into 3D printing equipment, and carrying out selective laser melting processing to obtain an initial first parent part and a first gradual change structure;
and taking the initial first parent material part and the first gradual change structure off the substrate, and processing to obtain the first parent material part and the first gradual change structure.
In this embodiment, through the 3D printing process, a part with nearly full density and good mechanical properties can be directly formed, that is, the first parent material portion with a higher melting point and the first gradual change structure can be obtained, and specifically, the 3D printing process can be means such as selective laser melting forming, electric arc additive manufacturing, electron beam additive manufacturing, or photocuring forming.
In a possible embodiment, before the step of adding the powder corresponding to the first parent material portion and the material of the first gradual change structure into the 3D printing apparatus, the material may be pretreated, specifically:
and drying and screening the powder corresponding to the first parent material part and the material with the first gradual change structure to control the particle size of the powder and reduce the humidity of the powder. In order to improve the performance of the resulting first parent material portion and first transition structure.
The performing of the print preparation job may specifically include: polishing the substrate, roughly adjusting a scraper, finely adjusting the position of the platform and providing an inert gas atmosphere. In order to improve the performance of the resulting first parent material portion and first transition structure.
In a possible embodiment, the step of guiding the slice file into a 3D printing device for selective laser melting processing to obtain an initial first parent material portion and a first gradual change structure includes:
importing the slice file into 3D printing equipment for selective laser melting processing;
and introducing air into the 3D printing equipment, releasing inert gas, taking a piece, and carrying out heat treatment to obtain an initial first mother material part and a first gradual change structure.
In the embodiment, the slice file is guided into the 3D printing device, then the 3D printing device performs selective laser melting according to the slice file, after the processing is completed, air is introduced into the 3D printing device, and inert gas is released, so that the workpiece taking operation can be performed, and the taken first mother material part and the taken first gradient structure are subjected to heat treatment, so that the first mother material part and the first gradient structure with better performance are obtained.
In a possible embodiment, the initial first mother material portion and the first grading structure are removed from the substrate and processed to obtain the first mother material portion and the first grading structure, which may specifically be:
through the line cutting technology, take off initial first mother board portion and first gradual change structure from the base plate, then, carry out surface treatment, washing, weathering to initial first mother board portion and first gradual change structure, obtain first mother board portion and first gradual change structure to improve the performance of first mother board portion and first gradual change structure.
Step S3: placing the first parent material portion and the first transition structure into a casting mold of a corresponding size, wherein the first transition structure is on an upper portion of the first parent material portion;
in this embodiment, a casting mold is prepared that is adapted to the dimensions of the first parent material portion and the first transition structure, specifically, the casting mold may be a crucible, and then the first parent material portion and the first transition structure are placed in the casting mold, with the first transition structure being on the upper portion of the first parent material portion.
Step S4: heating and melting the materials of the second mother material part and the second gradual change structure to obtain pouring liquid;
in the present embodiment, an appropriate amount of material is prepared and heated and melted according to the sizes of the second parent material portion and the second gradation structure and the corresponding material thereof to obtain a casting liquid for casting the second gradation structure and the second parent material portion, wherein the casting liquid may have an appropriate margin.
Step S5: the pouring liquid is pretreated, and the pretreated pouring liquid is poured into a pouring mold with the first mother material part and the first gradual change structure, so that the pouring liquid is soaked into gaps of the first gradual change structure, and a gradient lattice connection structure containing heterogeneous materials is formed;
in one possible embodiment, the method for pretreating casting liquid may include:
and (4) preserving heat of the pouring liquid for later use, wherein the heat preservation temperature is lower than the melting point of the material of the first gradual change structure. So as to prevent the pouring liquid from damaging the shape of the first gradual change structure during pouring.
Step S6: and cooling and solidifying to obtain the heterogeneous material gradient structure connecting joint comprising the connecting part, the first mother material part and the second mother material part.
By the method, the high-melting-point metal is processed into a gradient lattice rigid frame (namely a first gradual change structure) by using a 3D printing technology; then casting low-melting-point metal components on the gradient lattice rigid frame, enabling the low-melting-point metal components to wrap the periphery of the lattice, filling lattice gaps, and forming a complete joint structure, namely obtaining a heterogeneous material gradient structure connecting joint with a gradient structure, wherein the first gradient structure and the second gradient structure are staggered gradient structures in a three-dimensional space, so that structures of different materials can form a gradient transition structure at a connecting part, thereby realizing transition of material performance, avoiding mutation of the materials of different materials at the connecting part, and further enhancing the connecting strength of the heterogeneous materials.
It should be understood that while the present specification has described preferred embodiments of the present application, additional variations and modifications of those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
It should be understood that while the present specification has described preferred embodiments of the present application, additional variations and modifications of those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The present application provides a heterogeneous material gradient structure connection joint and a method for manufacturing the same, which are described in detail above, and the principles and embodiments of the present application are explained herein by using specific examples, and the description of the above examples is only used to help understand the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A dissimilar material gradient structure joint, comprising:
the connecting part (3) comprises a first gradual change structure (31) and a second gradual change structure (32) which are mutually embedded, and the materials of the first gradual change structure (31) and the second gradual change structure (32) are different;
a first parent material part (1), wherein the first parent material part (1) is connected to one end, close to the first gradual change structure (31), of the connecting part (3), and the material of the first parent material part (1) is the same as that of the first gradual change structure (31);
a second parent material portion (2), wherein the second parent material portion (2) is connected to one end, far away from the first parent material portion (1), of the connecting portion (3), and the material of the second parent material portion (2) is the same as that of the second gradual change structure (32);
in the direction of the connecting portion (3) away from the first parent material portion (1), the spatial density of the first gradual change structure (31) gradually decreases, and the spatial density of the second gradual change structure (32) gradually increases.
2. The metamaterial gradient structure connection junction according to claim 1, wherein the material of the first graded structure (31) has a higher melting point than the material of the second graded structure (32);
the first gradual change structure (31) comprises a plurality of connecting rods which are staggered to form a first lattice structure;
the second graded structure (32) wraps around the first lattice structure and fills voids of the first lattice structure;
the rod diameter of the connecting rod is gradually reduced in a direction away from the first parent material portion (1) so that the spatial density of the first gradual structure (31) is gradually reduced and the spatial density of the second gradual structure (32) is gradually increased.
3. A method for preparing a metamaterial gradient structure joint, the method being used for preparing the metamaterial gradient structure joint of any one of claims 1 to 2, the method comprising:
drawing a corresponding CAD model according to the first parent material part, the first gradual change structure and the material characteristics of the first gradual change structure;
obtaining the first parent material part and the first gradient structure by adopting a 3D printing process according to the materials of the first parent material part and the first gradient structure and the corresponding CAD model;
placing the first parent material portion and the first transition structure into a casting mold of a corresponding size, wherein the first transition structure is on an upper portion of the first parent material portion;
heating and melting the materials of the second mother material part and the second gradual change structure to obtain pouring liquid;
the pouring liquid is pretreated, and the pretreated pouring liquid is poured into a pouring mold with the first mother material part and the first gradual change structure, so that the pouring liquid is soaked into gaps of the first gradual change structure, and a gradient lattice connection structure containing heterogeneous materials is formed;
and cooling and solidifying to obtain the heterogeneous material gradient structure connecting joint comprising the connecting part, the first mother material part and the second mother material part.
4. The method of claim 3,
obtaining the first parent material part and the first gradual change structure by adopting a 3D printing process according to the materials of the first parent material part and the first gradual change structure and the corresponding CAD model, and the method comprises the following steps:
converting the CAD model corresponding to the first parent material part and the first gradual change structure into an STL file, and importing the STL file into slicing software;
determining corresponding 3D printing parameters according to the material characteristics and the geometric characteristics of the first parent material part and the first gradient structure to obtain a slice file;
adding the first parent material part and powder corresponding to the material of the first gradual change structure into 3D printing equipment, and performing printing preparation work;
importing the slice file into 3D printing equipment, and carrying out selective laser melting processing to obtain an initial first parent part and a first gradual change structure;
and taking the initial first parent material part and the first gradual change structure off the substrate, and processing to obtain the first parent material part and the first gradual change structure.
5. The method of claim 4,
prior to the step of adding the first parent material portion and the powder corresponding to the material of the first grading structure into the 3D printing apparatus, the method further comprises:
and drying and screening the powder corresponding to the first parent material part and the material of the first gradual change structure to control the particle size of the powder and reduce the humidity of the powder.
6. The method of claim 4,
the step of performing print preparation includes at least:
polishing the substrate, roughly adjusting a scraper, finely adjusting the position of the platform and providing an inert gas atmosphere.
7. The method of claim 4,
will the slice file imports into 3D printing apparatus, carries out the selective laser melting processing, obtains initial first parent stock portion and first gradual change structure, includes:
importing the slice file into 3D printing equipment for selective laser melting processing;
and introducing air into the 3D printing equipment, releasing inert gas, taking a piece, and carrying out heat treatment to obtain an initial first mother material part and a first gradual change structure.
8. The method of claim 4,
taking down the initial first mother material part and the first gradual change structure from the substrate, and processing to obtain the first mother material part and the first gradual change structure, wherein the method comprises the following steps:
and taking the initial first mother material part and the first gradient structure off the substrate through a wire cutting process, and carrying out surface treatment, cleaning and blow-drying to obtain the first mother material part and the first gradient structure.
9. The method of claim 4,
the pouring liquid is pretreated, and the method comprises the following steps:
and preserving heat of the pouring liquid for later use, wherein the heat preservation temperature is lower than the melting point of the material with the first gradual change structure.
10. The method of claim 3,
the 3D printing process includes, but is not limited to, one of:
selective laser melting forming, electric arc additive manufacturing, electron beam additive manufacturing and photocuring forming.
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