CN114193580A - Method for enhancing interlayer shear strength of cement 3D printing and spray head device - Google Patents
Method for enhancing interlayer shear strength of cement 3D printing and spray head device Download PDFInfo
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- CN114193580A CN114193580A CN202210035039.1A CN202210035039A CN114193580A CN 114193580 A CN114193580 A CN 114193580A CN 202210035039 A CN202210035039 A CN 202210035039A CN 114193580 A CN114193580 A CN 114193580A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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Abstract
The invention discloses a method for enhancing the interlayer shear strength of cement 3D printing and a nozzle device, which comprises the following steps: (S1) designing a three-dimensional model of the building, determining a print thickness and a print width for each layer of the member: (S2) selecting a nozzle having a suitable diameter according to the layer printing thickness and the printing width of the member; (S3) selecting a proper gutter device according to the layer printing thickness and the printing width of the member, and mounting the gutter device below the head; (S4) using a 3D printer to perform 3D printing manufacturing on the cement-based material according to the three-dimensional model, wherein the spray head drives the groove device to move and the groove device is consistent with the running track of the spray head until the component printing is completed. The method for enhancing the interlayer shear strength of the cement 3D printing and the nozzle device provided by the invention have the advantages that the groove device is simple, convenient and feasible, the shapes are various, the stability is good, and the interlayer shear strength of the 3D printing is enhanced by adopting a mechanical meshing mode.
Description
Technical Field
The invention relates to the technical field of building material 3D printing equipment, in particular to a method for enhancing the interlayer shear strength of cement 3D printing and a nozzle device.
Background
With the development of the intelligent construction technology in the building industry, the advantages of the 3D printing rapid prototyping technology are gradually outstanding, and the 3D printing rapid prototyping technology has a wide application prospect in the field of buildings, but the development of the 3D printing in the field of buildings is still limited. Layer-by-layer printing is the main characteristic of the 3D printing technology, so that the printed component naturally has a layering phenomenon, an obvious bonding interface appears between layers, and the component between two continuous layers has poorer integrity than the integral pouring construction. The construction mode of layer-by-layer accumulation makes the printing component inevitably have interlayer shearing performance weak, the adhesive property and the shearing performance at the interface are obviously lower than those of the matrix, and the printing component is easy to damage firstly when stressed, thereby influencing the integrity and the structural use performance of the printing component. Therefore, it is very important to enhance the interlayer bonding strength of the 3D printing cement-based material, thereby improving the service life of the 3D printing building.
At present, the 3D printing technology of building materials mainly adopts a mechanical method and a chemical method to enhance the bonding between layers, so that the shearing strength between the layers is improved, and if double spray heads are used, different interface agents are coated between the layers, so that the two layers are tightly bonded. The method can improve the problem of weak interlayer interface to a certain extent, but a more complex double-nozzle printing device is introduced to bring more bonding interfaces, and the cost of the interlayer adhesive is higher, so that the interlayer adhesive is not beneficial to large-scale use.
The 3D printing filling structure with the mortise and tenon joint structure and the processing technology thereof are well known from CN108673880, a mortise and tenon joint-shaped mechanical meshing structure exists between adjacent filaments by a 3D printing method, so that more filling structures in the product bear external force together, and the borne external force is dispersed to each filament structure in the product. The invention enhances the integrity of large-area filling members, but the interlayer problem of a single layer without filling members is not effectively solved.
Therefore, the interlayer interface is a significant challenge for influencing the popularization and application of the 3D printing component in the building industry. Research is carried out aiming at the interface characteristic, the interface performance of the 3D printing component is improved by using a simple device and a machine, the interlayer shear strength is enhanced, and the problem to be solved urgently is solved for the 3D printing building.
In summary, the application field of the current 3D printing building material has certain limitations due to weak interlayer interfaces.
Disclosure of Invention
In view of the above, the invention provides a method for enhancing interlayer shear strength of cement 3D printing and a nozzle device, wherein an uneven groove device is nested on a printing nozzle, so that printing component layers have an engaged uneven structure, thereby achieving the effect of improving the interlayer shear strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for enhancing interlayer shear strength of cement 3D printing comprises the following steps:
(S1) designing a three-dimensional model of the building, determining a print thickness and a print width for each layer of the member:
(S2) selecting a nozzle having a suitable diameter according to the layer printing thickness and the printing width of the member;
(S3) selecting a proper gutter device according to the layer printing thickness and the printing width of the member, and mounting the gutter device below the head;
(S4) using a 3D printer to perform 3D printing manufacturing on the cement-based material according to the three-dimensional model, wherein the spray head drives the groove device to move and the groove device is consistent with the running track of the spray head until the component printing is completed.
Preferably, the method further comprises (S5): and after the printing of the component is completed and the 3D printing material is completely hardened, performing water spraying maintenance treatment on the printed component, and using the component after the set maintenance age is reached.
Preferably, the diameter of the spray head is 30-70 mm; the cross section of the spray head is round, square or rectangular.
Preferably, the groove depth of the groove device is 5% -30% of the height of each printing layer.
Preferably, the gutter means has a gutter depth of 20% of the height of each printed layer.
Preferably, the 3D printer adopts any one of frame-type cement 3D printer, planer-type cement 3D printer or mechanical arm formula cement 3D printer.
Preferably, the cement-based material is cement mortar or cement paste material, wherein the cement material of the cement mortar or cement paste material is composed of a gelled material and an additive added into the gelled material.
Preferably, the cementing material is any one of sulphoaluminate cement, rapid hardening portland cement and ferro-aluminate cement, and the additive is any one of polycarboxylic acid water reducing agent, cellulose and latex powder.
The invention also provides a nozzle device for enhancing the shearing strength between cement 3D printing layers, wherein the nozzle device comprises a 3D printing nozzle and a groove device, the lower part of the nozzle is in threaded connection with the groove device, and the lower end surface of the groove device is uniformly and annularly provided with a plurality of grooves; the lower end face of the gutter device is aligned with a printing member, which is placed on a printing platform.
Preferably, the groove formed on the lower end face of the groove device is in any one of a sawtooth shape, a wedge shape and a circular tooth shape.
Compared with the prior art, the invention has the beneficial effects that:
(1) the groove device provided by the invention has sawteeth which are uniformly distributed in 360 degrees, and can synchronously run with a printing spray head in any direction without considering the problem of steering;
(2) the groove device is simple and easy to operate, various in shape and good in stability; on the basis of not changing the original 3D printing path and not increasing other printing equipment and a feeding system, synchronous operation with a printing nozzle can be realized, and the shearing strength between layers of the 3D printing is enhanced by adopting a mechanical meshing mode;
(3) the groove device can be replaced by groove devices with different specifications and models according to the printing size, and can have various mutually-meshed shapes.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1. 3D printing a spray head; 2. a threaded connection; 3. a trench device; 4. a printing member; 5. a printing platform.
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 only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in figure 1, the invention provides a method and a nozzle device for enhancing interlayer shear strength of cement 3D printing, wherein an uneven groove device 3 is nested on a printing nozzle, so that printing components 4 have an engaged uneven structure between layers, and the effect of improving the interlayer shear strength is achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for enhancing interlayer shear strength of cement 3D printing comprises the following steps:
(S1) designing a three-dimensional model of the building, and determining a print thickness and a print width for each layer of the member.
(S2) selecting a nozzle having a suitable diameter according to the layer printing thickness and the printing width of the member;
the diameter of the spray head is 30-70 mm, such as 30mm, 40mm, 50mm and 70 mm; the cross section of the spray head is round, square or rectangular, etc.
(S3) selecting a proper gutter device 3 according to the layer printing thickness and printing width of the member, and mounting the gutter device 3 below the head;
the groove depth of the groove device 3 is 5% -30% of the height of each printing layer. Such as 5%, 10%, 15%, 20%, 30%, etc., it is not recommended to exceed 50% of the printed layer height, and the groove depth of the groove means 3 of the present embodiment is 20% of the printed layer height per layer.
(S4) 3D printing and manufacturing the cement-based material according to the three-dimensional model by using a 3D printer, wherein the groove device 3 is driven by a spray head to move, and the running tracks of the groove device 3 and the spray head are consistent until the component printing is finished;
the 3D printer adopts a cement 3D printer, including but not limited to a frame type, gantry type or mechanical arm type 3D printer, wherein the frame type cement 3D printer is used;
the printed cement-based material adopts cement mortar or cement paste material, wherein the cement material of the cement mortar or cement paste material is composed of a gelled material and an additive added in the gelled material. The cementing material is a cement-based material with quick-hardening early-strength performance, such as sulphoaluminate cement, quick-hardening portland cement, ferro-aluminate cement and the like, and the additive comprises but is not limited to a polycarboxylic acid water reducing agent, cellulose, latex powder and the like.
(S5) when the printing of the component is finished and the 3D printing material is completely hardened, carrying out water spraying maintenance treatment on the printed component, and using the component after the set maintenance age is reached;
the water spraying maintenance treatment mainly refers to the water spraying maintenance of the cement-based material member printed by the 3D printing by using a spraying maintenance device, and the repeated spraying maintenance can promote the hydration reaction of the cement-based material, so that the cement-based material member has better mechanical properties.
The utility model provides an increase cement 3D and print shower nozzle device of interlaminar shear strength, the shower nozzle device includes that 3D prints shower nozzle 1 and slot device 3, and the below of shower nozzle has threaded connection department 2, and the below threaded connection of shower nozzle has slot device 3, and a plurality of unevenness's slot has been seted up to the even hoop of lower terminal surface of slot device 3, and 360 encircles of lower terminal surface of slot device 3 set up 6 sawtooth on average in this embodiment. And in the printing process, the cement-based material which is printed newly and has better fluidity is locally extruded and partitioned.
The lower end face of the gutter device 3 is aligned with a printing member 4, the printing member 4 being placed on a printing platform 5.
The uneven groove shape formed on the lower end face of the groove device 3 includes, but is not limited to, a sawtooth shape, a wedge shape, a circular tooth shape, and the like, and the sawtooth-shaped groove device 3 is used in the present embodiment.
The working principle of the invention is as follows:
the groove device 3 is simple, convenient and feasible, has various shapes and good stability; on the basis of not changing the original 3D printing path and not increasing other printing equipment and a feeding system, synchronous operation with a printing nozzle can be realized, and the shearing strength between layers of the 3D printing is enhanced by adopting a mechanical meshing mode;
through the groove device 3 with the nested unevenness on the printing spray head, the printing component 4 layers have the concave-convex structure which is meshed with each other, and simultaneously, the functions of compacting slurry and removing bubbles are achieved, so that the effect of improving the interlayer shearing strength is achieved. The method is mainly used in cement paste and cement mortar 3D printing, but is not limited to the application.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (10)
1. The method for enhancing the interlayer shear strength of cement 3D printing is characterized by comprising the following steps of:
(S1) designing a three-dimensional model of the building, determining a print thickness and a print width for each layer of the member:
(S2) selecting a nozzle having a suitable diameter according to the layer printing thickness and the printing width of the member;
(S3) selecting a proper gutter device according to the layer printing thickness and the printing width of the member, and mounting the gutter device below the head;
(S4) using a 3D printer to perform 3D printing manufacturing on the cement-based material according to the three-dimensional model, wherein the spray head drives the groove device to move and the groove device is consistent with the running track of the spray head until the component printing is completed.
2. The method of enhancing cement 3D printed interlaminar shear strength as claimed in claim 1, further comprising (S5): and after the printing of the component is completed and the 3D printing material is completely hardened, performing water spraying maintenance treatment on the printed component, and using the component after the set maintenance age is reached.
3. The method for enhancing interlaminar shear strength of cement 3D printing according to claim 1, wherein the diameter of the spray head is 30-70 mm; the cross section of the spray head is round, square or rectangular.
4. The method of enhancing cement 3D printed interlaminar shear strength of claim 1, wherein the groove depth of the groove means is between 5% and 30% of the height of each printed layer.
5. The method of enhancing cement 3D printed interlaminar shear strength of claim 4 wherein the groove depth of the groove means is 20% of the height of each printed layer.
6. The method for enhancing the interlaminar shear strength of a cement 3D printing according to claim 1, wherein the 3D printer is any one of a frame type cement 3D printer, a gantry type cement 3D printer or a mechanical arm type cement 3D printer.
7. The method for enhancing interlayer shear strength of cement 3D printing according to claim 1, wherein the cement-based material is cement mortar or cement paste material, wherein the cement material of the cement mortar or cement paste material is formed by a gelled material and an additive added to the gelled material.
8. The method for enhancing the interlaminar shear strength of cement 3D printing according to claim 7, characterized in that the cementing material is any one of sulphoaluminate cement, rapid hardening portland cement and ferro-aluminate cement, and the additive is any one of polycarboxylic acid water reducing agent, cellulose and latex powder.
9. The spray head device for enhancing the shear strength between cement 3D printing layers as claimed in any one of claims 1 to 8, wherein the spray head device comprises a 3D printing spray head and a groove device, the lower part of the spray head is in threaded connection with the groove device, and the lower end surface of the groove device is uniformly and annularly provided with a plurality of grooves; the lower end face of the gutter device is aligned with a printing member, which is placed on a printing platform.
10. The nozzle device for enhancing interlaminar shear strength of cement 3D printing according to claim 9, wherein the groove formed in the lower end surface of the groove device is in any one of a saw-tooth shape, a wedge shape and a circular tooth shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210035039.1A CN114193580A (en) | 2022-01-13 | 2022-01-13 | Method for enhancing interlayer shear strength of cement 3D printing and spray head device |
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| CN202210035039.1A CN114193580A (en) | 2022-01-13 | 2022-01-13 | Method for enhancing interlayer shear strength of cement 3D printing and spray head device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115286477A (en) * | 2022-06-30 | 2022-11-04 | 湖北航天化学技术研究所 | Solid propellant/coating layer integrated additive manufacturing interface structure |
| RU2792455C1 (en) * | 2022-11-01 | 2023-03-22 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Method of 3d print construction by layer-by-layer extrusion |
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| US20170182712A1 (en) * | 2015-12-28 | 2017-06-29 | Southwest Research Institute | Reinforcement System for Additive Manufacturing, Devices and Methods Using the Same |
| CN206405427U (en) * | 2016-02-19 | 2017-08-15 | 珠海天威飞马打印耗材有限公司 | FDM metal three-dimensional printers |
| CN110861292A (en) * | 2019-11-20 | 2020-03-06 | 华育昌(肇庆)智能科技研究有限公司 | Device for 3D printing and printing method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170182712A1 (en) * | 2015-12-28 | 2017-06-29 | Southwest Research Institute | Reinforcement System for Additive Manufacturing, Devices and Methods Using the Same |
| CN206405427U (en) * | 2016-02-19 | 2017-08-15 | 珠海天威飞马打印耗材有限公司 | FDM metal three-dimensional printers |
| CN110861292A (en) * | 2019-11-20 | 2020-03-06 | 华育昌(肇庆)智能科技研究有限公司 | Device for 3D printing and printing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286477A (en) * | 2022-06-30 | 2022-11-04 | 湖北航天化学技术研究所 | Solid propellant/coating layer integrated additive manufacturing interface structure |
| RU2792455C1 (en) * | 2022-11-01 | 2023-03-22 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Method of 3d print construction by layer-by-layer extrusion |
| RU2821490C1 (en) * | 2023-11-09 | 2024-06-25 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Method of construction 3d printing by layer-by-layer extrusion with controlled duration of technological break |
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