Deformation-controllable 3D printing cavity structure and cavity design method and system

Abstract

The invention discloses a 3D printing cavity structure capable of controlling deformation and a cavity design method and system. The 3D printing cavity structure capable of controlling deformation comprises a positioning block, geometric structure parameters corresponding to a single-layer cavity structure input by a user, a local limiting boundary, position calibration of the structure in the local limiting boundary and single-layer load capacity determination. A printing layer height is set for the module cavity structure, multiple layers and single layers of cavity structures are matched with different superposition modes through static analysis, and the module cavity structure is obtained after superposition; screening a target layout scheme of the module cavity structure according to a printing target of the functional cavity structure; the cavity structures with different functions are overlapped through a transition connection structure, and a main body cavity model finally meeting the printing requirement is obtained; through design of user input, static analysis, optimization superposition and a transition connection structure, modular customization is performed according to specific function requirements, and through standardized module production, the error rate in integral forming is reduced, the production efficiency is improved, and meanwhile, the unit cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing cavity structure with controllable deformation, a cavity design method and a system. Background Art

[0002] At present, with the widespread application of 3D printing technology in lightweight, functional integration and customized production, more standard plastic products can be quickly produced. For example, China's public patent number CN116330668A discloses a design and production method and system for a 3D printed cavity structure with controllable deformation. Through multi-material and local cross-linking strength control, heating and gas filling deformation mechanism, modular design and block printing, etc., it effectively solves the problems faced by traditional 3D printing technology in manufacturing deformable hollow structures, such as material waste, printing size limitation, single deformation control, and high equipment cost. However, the following problems still exist: 1. In the printing process of the same product, resin materials with different glass transition temperatures are required, which requires a more complicated formulation process, and the material properties may be unstable, which will cause subsequent quality problems of the product, increase R&D costs and technical barriers, and limit the popularization of the technology.

[0003] 2. Despite the use of block printing and modular design, the printing size of DLP technology is still small, making it difficult to manufacture large-sized daily necessities. In particular, the fixed honeycomb structure is difficult to adapt to complex or irregular geometric shapes, and may cause printing defects such as layer separation or deformation due to insufficient support, limiting the application of technology in large-size products.

[0004] 3. Current technology can usually only achieve deformation in two states: before and after expansion. If there is continuous deformation, it will cause the surface of the printed part to be uneven, increase the workload of post-processing, and limit the flexibility and functionality of the design.

[0005] In view of this, the present invention provides a 3D printing cavity structure with controllable deformation, a cavity design method and a system to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a 3D printing cavity structure with controllable deformation, a cavity design method and a system to solve the problems in the above-mentioned background technology.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a controllable deformable 3D printed cavity structure, comprising a customized main body cavity model based on a target main body, wherein the main body cavity model comprises a plurality of longitudinally staggered functional cavity structures connected to each other, and the functional cavity structures are connected by transition connection structures; The functional cavity structure is divided into a plurality of module cavity structures according to the printing target, and each module cavity structure is printed by multiple layers of single-layer cavity structures; The single-layer cavity structure includes an outer protective structure and an inner protective structure, between which a plurality of thin sheet structures, a solidified structure and a local hollow structure are arranged, and adjacent thin sheet structures are connected to each other through the solidified structure.

[0008] As a preferred technical solution of the first aspect of the present invention, a reserved installation hole is provided on the single-layer cavity structure, and a sensor is matched in the reserved installation hole according to the functional requirements of the single-layer cavity structure.

[0009] As a preferred technical solution of the first aspect of the present invention, the area enclosed by one or more structures among the thin sheet structure, the solidification structure, the outer protective structure and the inner protective structure is a local hollow structure.

[0010] As a preferred technical solution of the first aspect of the present invention, the transition connection structure includes upper and lower symmetrical connection parts, a partition is arranged between the two connection parts, and the partition is provided with a through hole.

[0011] In a second aspect, the present invention provides a method for designing a 3D printing cavity structure with controllable deformation, which is used to design the first aspect, wherein the 3D printing cavity structure includes a plurality of functional cavity structures connected in a criss-cross pattern, wherein the functional cavity structure is divided into a plurality of module cavity structures according to a printing target, and each module cavity structure is printed by multiple layers of single-layer cavity structures; the method comprises the following steps: Step S1: The user inputs geometric structure parameters corresponding to the single-layer cavity structure, specifies the geometric patterns corresponding to the outer protective structure and the inner protective structure as the local restriction boundary, and calibrates the positions of the sheet structure, the solidified structure and the local hollow structure within the local restriction boundary, thereby determining the single-layer load capacity of the single-layer cavity structure; Step S2: setting the printing layer height for the module cavity structure, matching the multi-layer single-layer cavity structure with different stacking methods through static analysis, and marking the stacked multi-layer single-layer cavity structure as a module cavity structure; Step S3: acquiring a solution layout pattern group and a corresponding solution evaluation coefficient according to the printing target of the functional cavity structure, and screening a target layout solution of the module cavity structure based on the solution evaluation coefficient; Step S4: superimposing different functional cavity structures through transition connection structures to obtain a main cavity model that ultimately meets printing requirements.

[0012] As a preferred technical solution of the second aspect of the present invention, the logic for obtaining the single-layer load capacity is: Extracting the first boundary load capacity provided by the outer protective structure and the inner protective structure; Extract the first strain load capacity provided by the thin sheet structure per unit length within the local restricted boundary, assuming that the force of the solidified structure fixed on the thin sheet structure of the preset unit length offsets the loss of the first strain load capacity, and maintains the first strain load capacity unchanged; The corresponding positions of the sheet structure, the solidified structure and the local hollow structure are determined by taking the minimum number of solidified structures and the maximum area of ​​the local hollow structure as constraints; The number of thin-layer structures is multiplied by the first strain load capacity and combined with the first boundary load capacity to form the single-layer load capacity of the single-layer cavity structure.

[0013] As a preferred technical solution of the second aspect of the present invention, the acquisition logic of the module cavity structure is: The layer height of the single-layer cavity structure is N layers, where N is a positive integer; Finite element modeling is performed on each layer of the single-layer cavity structure. In the finite element model, the lateral surface of the single-layer cavity structure is meshed. The intersection of each mesh is a node, and the midpoint of the thin sheet structure and the solidified structure is the stress point. Perform static analysis on the longitudinal layer height in the finite element model to obtain the strain load capacity of the current single-layer cavity structure, that is, the strain load capacity of all stress points, including the layer height and the node position of the current layer height; Based on prior knowledge, the proportional factors corresponding to each layer height are extracted, and the strain load capacity of the stress point corresponding to each layer height is obtained based on the proportional factors. If the strain load capacity is within the preset strain load threshold range, the single-layer cavity structure of the current layer height and the adjacent low layer height are staggered and superimposed; If the strain load capacity is greater than the maximum value of the preset strain load threshold, the single-layer cavity structure of the current layer height and the adjacent lower layer height are superimposed in space; If the strain load capacity is less than the minimum value of the preset strain load threshold, the single-layer cavity structure of the current layer height and the adjacent lower layer height are stacked in parallel; N layers of single-layer cavity structures are statically stacked into a modular cavity structure.

[0014] As a preferred technical solution of the second aspect of the present invention, the acquisition logic of the target layout solution is: In the historical database, an overlay printing process is performed according to the effect requirements after the target printing, and an overlay printing logic line of the functional cavity structure is obtained; Arrange and plan multiple scheme layout modules and scheme evaluation coefficients corresponding to each scheme layout module according to the superimposed printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table; Compare the stability of the scheme layout modules one by one according to the scheme evaluation table, so as to obtain the scheme matching degree, and mark the scheme layout module with the highest scheme matching degree as the target layout scheme of the module cavity structure; Multiple layout modules and confirmed target layout plans are stored in a history database.

[0015] As a preferred technical solution of the second aspect of the present invention, the functional cavity structure includes a supporting cavity area, a flexible deformation area and a lightweight folding area, wherein: a support cavity region for stabilizing the target body; Flexible deformation area, supporting the bending and expansion deformation of the target body; Lightweight folding area that supports target body folding and dynamic shape changes.

[0016] In a third aspect, the present invention provides a 3D printing cavity structure design system with controllable deformation, which is implemented based on the second aspect and includes: In the single-layer cavity structure analysis module, the user inputs the geometric structure parameters corresponding to the single-layer cavity structure, specifies the geometric patterns corresponding to the outer protection structure and the inner protection structure as the local restriction boundary, and calibrates the position of the thin-sheet structure, the solidified structure and the local hollow structure within the local restriction boundary, thereby determining the single-layer load capacity of the single-layer cavity structure; The module cavity structure analysis module sets the printing layer height for the module cavity structure, matches the multi-layer single-layer cavity structure with different stacking methods through static analysis, and marks the stacked multi-layer single-layer cavity structure as the module cavity structure; A functional cavity structure analysis module obtains a scheme layout pattern group and a corresponding scheme evaluation coefficient according to a printing target of the functional cavity structure, and selects a target layout scheme of the module cavity structure based on the scheme evaluation coefficient; The integrated superposition control module superimposes different functional cavity structures through transition connection structures to obtain a main cavity model that ultimately meets the printing requirements.

[0017] In the above technical solution, the technical effects and advantages provided by the present invention are: The present invention uses user input, static analysis, optimization of the design of the superposition and transition connection structure, modular customization according to specific functional requirements, and standardized module production to reduce the error rate in the integrated molding, improve production efficiency, and reduce unit cost; Static analysis is used to evaluate the mechanical properties of the single-layer cavity structure to ensure that each module can meet the design requirements after being stacked, optimize the bearing capacity and stability of the overall structure, and then match different stacking methods to reduce material waste while improving the strength and rigidity of the structure; a smooth transition between different functional areas is also achieved through a transition connection structure. This design can avoid stress concentration and improve the overall performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the 3D printing cavity structure of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the module cavity structure of the present invention.

[0021] Figure 3 It is a schematic structural diagram of the single-layer cavity structure of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the transition connection structure of the present invention.

[0023] Figure 5 It is a schematic structural diagram of parallel stacking in a stacking scenario of thin-sheet structures of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of staggered stacking of the second thin-sheet structure stacking scenario of the present invention.

[0025] Figure 7 It is a schematic diagram of the structure of three spaced-apart superpositions in the stacking scenario of the thin-film structure of the present invention.

[0026] Figure 8 This is a flow chart of the 3D printing cavity structure design method of the present invention.

[0027] Fig. 9 This is a system framework diagram for designing a 3D printed cavity structure according to the present invention.

[0028] Description of reference numerals: 100. Main body cavity model; 110. Single-layer cavity structure; 111. Thin sheet structure; 112. Solidified structure; 113. Local hollow structure; 114 External protective structure; 115. Internal protective structure; 116. Reserved installation holes; 120. Module cavity structure; 130. Functional cavity structure; 140. Transition connection structure; 141. Connection part; 142. Partition; 143. Through hole. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0030] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, well-known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0031] Example 1 The present invention provides Figure 1-2 A controllable deformable 3D printed cavity structure is shown, comprising a customized main cavity model 100 based on a target main body, wherein the main cavity model 100 comprises a plurality of crisscross connected functional cavity structures 130, and a multi-state continuous deformation is achieved based on a cascade mode of the functional cavity structures 130; thereby, the main cavity model 100 is formed by superimposed printing; It should be noted that: taking the vase as the target subject, a main body cavity model 100 is customized with the vase shape. The vase shape can be a traditional cylindrical shape or a more complex geometric shape, such as a wavy shape or a polygon; taking the outer surface of the vase as the boundary, specifying a wall thickness value, such as 2 mm, to generate a 3D printed hollow structure with a specified wall thickness value, and creating a main body cavity model 100 based on the 3D printed hollow structure; in the 3D printing process, a single-layer cavity structure 110 is printed on a plane, and then all functional cavity structures 130 are superimposed into a complete main body cavity model 100 through the staggered superposition technology.

[0032] The functional cavity structures 130 are sliced ​​according to the functional regions divided by the main cavity model 100, and the functional cavity structures 130 are connected by transition connection structures 140; In the 3D printing process, the connection between two different functional areas such as the support area, the flexible deformation area, and the lightweight folding area is a key issue. A gradual transition structure is designed between the two functional areas so that the material properties and geometric shapes change gradually rather than suddenly. Figure 4 As shown: The transition connection structure 140 includes a vertically symmetrical connection part 141; the connection part 141 is the main part of the transition connection structure, which is used to connect the module cavity structures 120 of two different functional areas. The vertically symmetrical design can ensure that the mechanical properties of the structure are consistent in two directions, which is convenient for realizing two-way transition.

[0033] A partition plate 142 is disposed between the two connecting parts 141 , and a through hole 143 is disposed on the partition plate 142 ; Among them: the partition 142 between the two connecting parts 141 plays a role of separation and support. The internal space of the two functional areas is separated to avoid mutual interference between different functional areas. For example, between the flexible deformation area and the support area, the partition can prevent the mixing between the flexible material and the rigid material. Most importantly, it can also provide additional support strength to ensure the structural stability of the transition area.

[0034] The through hole 143 can disperse stress, avoid the occurrence of stress concentration points, and achieve functional coupling between two functional areas. For example, between the flexible deformation area and the support area, the through hole can allow part of the flexible material to pass through, thereby achieving a gradual transition between flexibility and rigidity.

[0035] In practical applications, the disadvantages of coupling different materials are concentrated at the transition connection structure 140, and the existing technology can be used to centrally process the transition connection structure 140. For example, for two resin materials with different glass transition temperatures, a design and production method and system for a 3D printed cavity structure with controllable deformation disclosed in patent number CN116330668A is used, and the deformation control method is simpler and more convenient.

[0036] The functional cavity structure 130 is divided into a plurality of module cavity structures 120 according to the printing target, and each module cavity structure 120 is printed by multiple layers of single-layer cavity structures 110; It should be noted that: a honeycomb support structure is added inside each functional cavity structure 130. The commonly used honeycomb support structure can be manually designed in CAD software, or automatically generated using special 3D printing slicing software such as Cura or PrusaSlicer. However, even in the same functional area, the printing requirements corresponding to different printing targets will be different. Therefore, the same functional area also needs to be divided into a module cavity structure 120. The more detailed the division area, the clearer the printing target, and the smaller the probability of error. In the same module cavity structure 120, the same type of one-time molded resin material is used. The resin material includes standardized resin materials and composite materials, which are convenient for mass production and quality control, so that the single-layer cavity structure 110 corresponding to each functional area slice has specific functions such as high strength, flexibility, deformation control, etc. The cascaded thin film structure 111 realizes the deformation of the overall structure through mechanical synergy and supports complex deformation control, such as bending, expansion, folding, etc.

[0037] The single-layer cavity structure 110 includes an outer protective structure 114 and an inner protective structure 115, and a combination of one or more thin sheet structures 111, a solidifying structure 112 and a local hollow structure 113 is arranged between the outer protective structure 114 and the inner protective structure 115. The thin sheet structure 111, the outer protective structure 114 and the inner protective structure 115 are interconnected through the solidifying structure 112, and the area enclosed by one or more of the thin sheet structure 111, the outer protective structure 114 and the inner protective structure 115 is a local hollow structure 113.

[0038] It should be noted that the thin sheet structure 111 serves the purpose of support, and adjacent thin sheet structures 111 are connected by a solidifying structure 112 to serve the purpose of solidification; the thin sheet structure 111 and the solidifying structure 112 are connected to form a local hollow structure 113 for functions such as weight reduction, heat dissipation, and fluid channels to achieve lightweight and functional integration, and deformable cavity technology is used in the local hollow structure 113 to dynamically adjust the internal supporting structure according to the shape of the vase to optimize stress distribution and material usage.

[0039] In summary, the controllable deformation 3D printed hollow structure described in this embodiment prints a single-layer cavity structure 110 on a plane, and based on the single-layer cavity structure 110 supporting complex deformation control such as bending, expansion, and folding, the complex deformed thin film structure 111 is formed into a basic frame with a honeycomb support function. In actual applications, the local hollow structure 113 is used to achieve functions such as weight reduction, heat dissipation, and fluid channels, thereby achieving lightweight and functional integration; the single-layer cavity structure 110 is printed to a preset position to form one of the functional cavity structures 130, and through the ideas of modularization, standardization, and multi-state continuous deformation, all the functional cavity structures 130 are formed into a complete main cavity model 100 through superimposed combination logic, thereby realizing customized manufacturing of controllable deformation 3D printed hollow structures. In particular, even if there is room for improvement in the current material properties, it takes time to test its stability. Therefore, on the basis of not changing the current material properties, the deformation control accuracy, printing size, and cost are improved by changing the production method, which has actual economic benefits.

[0040] Embodiment 2: like Figure 3 As shown, the part not described in detail in this embodiment is as shown in Example 1. This embodiment provides a 3D printed cavity with controllable deformation, and a reserved mounting hole 116 is provided on the single-layer cavity structure 110. The sensor is matched in the reserved mounting hole 116 according to the functional requirements of the single-layer cavity structure 110.

[0041] During the 3D printing process of the thin film structure, the sensor is embedded in the reserved mounting hole 116 at the corresponding predetermined position of the single-layer cavity structure 110. When printing reaches a certain layer of the single-layer cavity structure 110, the printing is paused, the sensor is placed at the predetermined position, and then printing is continued. The sensor is combined with the single-layer cavity structure 110 material using multi-material printing technology to reduce subsequent assembly steps.

[0042] Specifically, the printing parameters of the target body to be printed are monitored in real time by sensors, wherein the printing parameters include material data, shape state, temperature value and pressure value of the target body, so as to realize controllable deformation and real-time monitoring intelligent control of the hollow structure; the sensors include: Strain sensor: monitors the deformation and stress distribution of thin-film structures and the deformation state; Temperature sensor: monitors the temperature change of the thin film structure, used for thermal response control, and monitors temperature changes; Pressure sensor: monitors air pressure inside a hollow structure or external pressure; Acceleration sensor: monitors the vibration or motion state of the thin film structure; Humidity sensor: monitors ambient humidity and is suitable for specific application scenarios such as biomedical equipment.

[0043] Integrated sensors are used to monitor the status of each area in real time, such as deformation, temperature, pressure, humidity, etc., and send sensor data to the control terminal. Users can remotely control the deformation mode of the vase through the terminal; for example, when the temperature rises, the flexible deformation area automatically expands to increase heat dissipation, and when overload is detected, the supporting cavity area issues an alarm.

[0044] Embodiment 3: like Figure 8 As shown, the part not described in detail in this embodiment is as shown in Example 1. This embodiment provides a method for designing a 3D printing cavity structure with controllable deformation, which is applied to the design and correction of a 3D printing cavity structure. The 3D printing cavity structure includes a plurality of functional cavity structures 130 connected in a longitudinally staggered manner. The functional cavity structure 130 is divided into a plurality of module cavity structures 120 according to a printing target. Each module cavity structure 120 is printed by a plurality of single-layer cavity structures 110. The method comprises the following steps: Step S1: The user inputs geometric structure parameters corresponding to the single-layer cavity structure 110, specifies the geometric patterns corresponding to the outer protective structure 114 and the inner protective structure 115 as local restriction boundaries, and calibrates the positions of the sheet structure 111, the solidified structure 112 and the local hollow structure 113 within the local restriction boundaries, thereby determining the single-layer load capacity of the single-layer cavity structure 110; As an example, the user inputs the geometric parameters of the single-layer cavity structure 110 through the design software, and defines the outer protective structure 114 and the inner protective structure 115 as the outer wall and inner wall of the vase, with thicknesses of 3 mm and 2 mm respectively; a thin sheet structure 111 is arranged between the inner and outer protective structures, and the thin sheet structures are connected by a solidifying structure 112 to ensure the stability of the overall structure, and a local cavity structure is arranged in the interlaced part of the thin sheet structure to reduce weight and realize the expansion function.

[0045] It should also be noted that the single-layer load capacity refers to the load-bearing capacity of the single-layer cavity structure 110 when subjected to external loads. By optimizing the structural design, selecting appropriate materials and printing parameters, the single-layer load capacity of the single-layer cavity structure can be improved, thereby improving the performance and reliability of the entire 3D printed cavity structure. The logic for obtaining the single-layer load capacity is: Extracting a first boundary load capacity provided by the outer protective structure 114 and the inner protective structure 115; Extract the first strain load capacity provided by the thin sheet structure 111 per unit length within the local restricted boundary, assuming that the force of the solidified structure 112 fixed on the thin sheet structure 111 of a preset unit length offsets the loss of the first strain load capacity, and maintains the first strain load capacity unchanged; Finite element modeling is performed on the single-layer cavity structure 110. In the finite element model, the surface of the single-layer cavity structure 110 is meshed, each intersection of the meshes is a node, and the midpoint of the thin sheet structure 111 and the solidified structure 112 is a stress point; The corresponding positions of the sheet structure 111, the solidified structure 112 and the local hollow structure 113 are determined by taking the minimum number of solidified structures 112 and the maximum area of ​​the local hollow structure 113 as constraints; The single-layer load capacity of the single-layer cavity structure 110 is formed by multiplying the number of the thin-layer structures 111 by the first strain load capacity and combining the first boundary load capacity.

[0046] Step S2: setting a printing layer height for the module cavity structure 120 , matching the multi-layer single-layer cavity structure 110 with different stacking methods through static analysis, and marking the stacked multi-layer single-layer cavity structure 110 as the module cavity structure 120 ; It should be noted that: static analysis is performed on each module, such as Figure 5-7 As shown, the stacking methods include staggered stacking, parallel stacking and spaced stacking. The influence of different stacking methods on the module load capacity is considered.

[0047] Specifically, the acquisition logic of the module cavity structure 120 is: The single-layer cavity structure 110 has a layer height of N layers, where N is a positive integer; Finite element modeling is performed on each layer of the single-layer cavity structure 110. In the finite element model, the lateral surface of the single-layer cavity structure 110 is meshed, and the intersection of each mesh is a node, and the midpoint of the thin sheet structure 111 and the solidified structure 112 is a stress point; Perform static analysis on the longitudinal layer height in the finite element model to obtain the strain load capacity of the first N layers of the single-layer cavity structure 110, that is, the strain load capacity of all stress points, where the stress points include the layer height and the node position of the current layer height; Based on prior knowledge, the proportional factors corresponding to each layer height are extracted, and the strain load capacity of the stress point corresponding to each layer height is obtained based on the proportional factors. If the strain load capacity is within the preset strain load threshold range, the single-layer cavity structure 110 of the current layer height and the adjacent lower layer height are staggered and superimposed; If the strain load capacity is greater than the maximum value of the preset strain load threshold, the single-layer cavity structure 110 of the current layer height and the adjacent lower layer height are stacked in space; If the strain load capacity is less than the minimum value of the preset strain load threshold, the current layer height and the adjacent single-layer cavity structure 110 of the lower layer height are stacked in parallel; N layers of single-layer cavity structures 110 are stacked by static force to form a module cavity structure 120 .

[0048] Step S3: acquiring a solution layout pattern group and a corresponding solution evaluation coefficient according to the printing target of the functional cavity structure 130 , and screening a target layout solution of the module cavity structure 120 based on the solution evaluation coefficient; Specifically, the logic for obtaining the target layout solution is as follows: In the historical database, an overlay printing process is performed according to the effect requirements after the target printing, and an overlay printing logic line of the functional cavity structure 130 is obtained; Arrange and plan multiple scheme layout modules and scheme evaluation coefficients corresponding to each scheme layout module according to the superimposed printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table; Comparing the stability of the scheme layout modules one by one according to the scheme evaluation table, so as to obtain the scheme matching degree, and marking the scheme layout module with the highest scheme matching degree as the target layout scheme of the module cavity structure 120; Multiple layout modules and confirmed target layout plans are stored in a history database.

[0049] Step S4: superimposing the different functional cavity structures 130 through the transition structure 140 to obtain the main cavity model 100 that finally meets the printing requirements.

[0050] Specifically, the division logic of the functional cavity structure 130 is: The functional cavity structure 130 includes a supporting cavity area, a flexible deformation area and a lightweight folding area; it achieves a perfect combination of structural stability, complex deformation ability and lightweight, and has a wide range of application prospects. With the vase as the target subject, a wavy geometric design is adopted to increase the aesthetics and deformation possibility, and the wall thickness is 2 mm to ensure structural strength while achieving lightweight; wherein: The supporting cavity area is used to stabilize the target subject. Taking the vase as an example, it is mainly reflected in the base, which provides structural stability and load-bearing capacity. It is made of high-strength resin material and filled with a high-density honeycomb support structure to enhance the compressive resistance and ensure that the base can bear the weight of the vase and its contents.

[0051] The flexible deformation area supports bending and expansion. Taking a vase as an example, it is mainly reflected in the bottle body, which can change different shapes to meet the diverse needs of users. Flexible resin materials are used to achieve the bending deformation of the vase through the flexible thin film structure 111 in the middle area, and the expansion is achieved through the deformable cavity technology in the local hollow structure 113, ensuring that the bottle body can achieve bending and expansion deformation.

[0052] The lightweight folding area supports folding and dynamic shape change. It adopts lightweight composite materials and is internally designed as an ultra-low-density honeycomb support structure to further reduce weight and ensure that the bottle mouth is light and easy to deform, thereby achieving lightweight and versatility. A foldable hinge structure is designed in the local hollow structure 113 to support the folding and unfolding of the bottle mouth.

[0053] Based on prior knowledge, the printing target of the target body is structurally divided, the functional cavity structure 130 corresponding to the body cavity model 100 is determined, and the cavity structure geometric parameters of the functional cavity structure 130 are extracted.

[0054] Embodiment 4: like Fig. 9 As shown, the part not described in detail in this embodiment is as shown in Example 1. This embodiment provides a 3D printing cavity structure design system with controllable deformation, including a single-layer cavity structure analysis module 200, a module cavity structure analysis module 300, a functional cavity structure analysis module 400 and an integrated superposition control module 500, and each module is connected by wire or wirelessly; In the single-layer cavity structure analysis module 200, the user inputs geometric structure parameters corresponding to the single-layer cavity structure 110, specifies the geometric patterns corresponding to the outer protective structure 114 and the inner protective structure 115 as local restriction boundaries, and calibrates the positions of the sheet structure 111, the solidified structure 112, and the local hollow structure 113 within the local restriction boundaries, thereby determining the single-layer load capacity of the single-layer cavity structure 110; The module cavity structure analysis module 300 sets the printing layer height for the module cavity structure 120, matches the multi-layer single-layer cavity structure 110 with different stacking modes through static analysis, and marks the stacked multi-layer single-layer cavity structure 110 as the module cavity structure 120; The functional cavity structure analysis module 400 obtains a solution layout pattern group and a corresponding solution evaluation coefficient according to the printing target of the functional cavity structure 130, and selects a target layout solution of the module cavity structure 120 based on the solution evaluation coefficient; The integrated superposition control module 500 superimposes the cavity structures 130 with different functions through the transition connection structure 140 to obtain the main cavity model 100 that ultimately meets the printing requirements.

[0055] The logic for obtaining the single-layer load capacity is: Extracting a first boundary load capacity provided by the outer protective structure 114 and the inner protective structure 115; Extract the first strain load capacity provided by the thin sheet structure 111 per unit length within the local restricted boundary, assuming that the force of the solidified structure 112 fixed on the thin sheet structure 111 of a preset unit length offsets the loss of the first strain load capacity, and maintains the first strain load capacity unchanged; The corresponding positions of the sheet structure 111, the solidified structure 112 and the local hollow structure 113 are determined by taking the minimum number of solidified structures 112 and the maximum area of ​​the local hollow structure 113 as constraints; The single-layer load capacity of the single-layer cavity structure 110 is formed by multiplying the number of the thin-layer structures 111 by the first strain load capacity and combining the first boundary load capacity.

[0056] The acquisition logic of the module cavity structure 120 is: The single-layer cavity structure 110 has a layer height of N layers, where N is a positive integer; Finite element modeling is performed on each layer of the single-layer cavity structure 110. In the finite element model, the lateral surface of the single-layer cavity structure 110 is meshed, and the intersection of each mesh is a node, and the midpoint of the thin sheet structure 111 and the solidified structure 112 is a stress point; Perform static analysis on the longitudinal layer height in the finite element model to obtain the strain load capacity of the current single-layer cavity structure 110, that is, the strain load capacity of all stress points, where the stress points include the layer height and the node position of the current layer height; Based on prior knowledge, the proportional factors corresponding to each layer height are extracted, and the strain load capacity of the stress point corresponding to each layer height is obtained based on the proportional factors. If the strain load capacity is within the preset strain load threshold range, the single-layer cavity structure 110 of the current layer height and the adjacent lower layer height are staggered and superimposed; If the strain load capacity is greater than the maximum value of the preset strain load threshold, the single-layer cavity structure 110 of the current layer height and the adjacent lower layer height are stacked in space; If the strain load capacity is less than the minimum value of the preset strain load threshold, the current layer height and the adjacent single-layer cavity structure 110 of the lower layer height are stacked in parallel; N layers of single-layer cavity structures 110 are stacked by static force to form a module cavity structure 120 .

[0057] The logic for obtaining the target layout scheme: In the historical database, an overlay printing process is performed according to the effect requirements after the target printing, and an overlay printing logic line of the functional cavity structure 130 is obtained; Arrange and plan multiple scheme layout modules and scheme evaluation coefficients corresponding to each scheme layout module according to the superimposed printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table; Comparing the stability of the scheme layout modules one by one according to the scheme evaluation table, so as to obtain the scheme matching degree, and marking the scheme layout module with the highest scheme matching degree as the target layout scheme of the module cavity structure 120; Multiple layout modules and confirmed target layout plans are stored in a history database.

[0058] The functional cavity structure 130 includes a supporting cavity area, a flexible deformation area and a lightweight folding area, wherein: a support cavity region for stabilizing the target body; Flexible deformation area, supporting the bending and expansion deformation of the target body; Lightweight folding area that supports target body folding and dynamic shape changes.

[0059] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A 3D printed cavity structure with controllable deformation, characterized in that: The method comprises setting a main body cavity model (100) based on a customized target main body, wherein the main body cavity model (100) comprises a plurality of longitudinally staggered and connected functional cavity structures (130), wherein the functional cavity structures (130) are connected via transition connection structures (140); The functional cavity structure (130) is divided into a plurality of module cavity structures (120) according to a printing target, and each module cavity structure (120) is printed from a plurality of single-layer cavity structures (110); The single-layer cavity structure (110) comprises an outer protective structure (114) and an inner protective structure (115), wherein one or more combinations of a plurality of thin sheet structures (111), a solidifying structure (112) and a local hollow structure (113) are arranged between the outer protective structure (114) and the inner protective structure (115), and adjacent thin sheet structures (111) are connected to each other via the solidifying structure (112).

2. The 3D printing cavity structure with controllable deformation according to claim 1, characterized in that: A reserved mounting hole (116) is provided on the single-layer cavity structure (110), and a sensor is matched in the reserved mounting hole (116) according to the functional requirements of the single-layer cavity structure (110).

3. The 3D printing cavity structure with controllable deformation according to claim 1, characterized in that: One or more structures among the thin sheet structure (111), the solidification structure (112), the outer protective structure (114) and the inner protective structure (115) enclose a region to form a local hollow structure (113).

4. The 3D printing cavity structure with controllable deformation according to claim 1, characterized in that: The transition connection structure (140) comprises upper and lower symmetrical connection parts (141), a partition plate (142) is provided between the two connection parts (141), and a through hole (143) is provided on the partition plate (142).

5. A method for designing a controllable deformable 3D printing cavity structure, used for designing a controllable deformable 3D printing cavity structure as claimed in any one of claims 1 to 4, wherein the 3D printing cavity structure comprises a plurality of longitudinally staggered functional cavity structures (130), wherein the functional cavity structure (130) is divided into a plurality of module cavity structures (120) according to a printing target, and each module cavity structure (120) is printed from a plurality of single-layer cavity structures (110); characterized in that: The following steps are involved: Step S1: The user inputs geometric structure parameters corresponding to the single-layer cavity structure (110), specifies geometric patterns corresponding to the outer protective structure (114) and the inner protective structure (115) as local restriction boundaries, and performs position calibration on the sheet structure (111), the solidified structure (112), and the local hollow structure (113) within the local restriction boundaries, thereby determining the single-layer load capacity of the single-layer cavity structure (110); Step S2: setting a printing layer height for the module cavity structure (120), matching different stacking methods of the multi-layer single-layer cavity structure (110) through static analysis, and marking the stacked multi-layer single-layer cavity structure (110) as a module cavity structure (120); Step S3: acquiring a solution layout pattern group and a corresponding solution evaluation coefficient according to the printing target of the functional cavity structure (130), and screening a target layout solution of the module cavity structure (120) based on the solution evaluation coefficient; Step S4: superimposing the different functional cavity structures (130) via the transition connection structure (140) to obtain a main cavity model (100) that ultimately meets the printing requirements.

6. The method for designing a 3D printing cavity structure with controllable deformation according to claim 5, characterized in that: The logic for obtaining the single-layer load capacity is: Extracting a first boundary load capacity provided by the outer protective structure (114) and the inner protective structure (115); Extracting a first strain load capacity provided by the thin sheet structure (111) per unit length within the local restricted boundary, assuming that the force of the solidified structure (112) fixed on the thin sheet structure (111) of a preset unit length offsets the loss of the first strain load capacity, thereby maintaining the first strain load capacity unchanged; The corresponding positions of the sheet structure (111), the solidified structure (112) and the local hollow structure (113) are determined by taking the minimum number of solidified structures (112) and the maximum area of ​​the local hollow structure (113) as constraints; The number of the thin-sheet structures (111) is multiplied by the first strain load capacity and combined with the first boundary load capacity to form a single-layer load capacity of the single-layer cavity structure (110).

7. The method for designing a 3D printing cavity structure with controllable deformation according to claim 6, characterized in that: The acquisition logic of the module cavity structure (120) is: The single-layer cavity structure (110) has a layer height of N layers, where N is a positive integer; Finite element modeling is performed on each layer of the single-layer cavity structure (110), and in the finite element model, a mesh is performed on the lateral surface of the single-layer cavity structure (110), and each intersection of the mesh is a node, and the midpoint of the thin sheet structure (111) and the solidified structure (112) is a stress point; Perform static analysis on the longitudinal layer height in the finite element model to obtain the strain load capacity of the current single-layer cavity structure (110), that is, the strain load capacity of all stress points, where the stress points include the layer height and the node position of the current layer height; Extracting a proportional factor corresponding to each layer height based on prior knowledge, obtaining a strain load capacity of a stress point corresponding to each layer height based on the proportional factor, and if the strain load capacity is within a preset strain load threshold range, staggering the current layer height and the single-layer cavity structure (110) of an adjacent lower layer height; If the strain load capacity is greater than the maximum value of the preset strain load threshold, the single-layer cavity structure (110) of the current layer height and the adjacent lower layer height are stacked in space; If the strain load capacity is less than the minimum value of the preset strain load threshold, the current layer height and the adjacent single-layer cavity structure (110) of the lower layer height are stacked in parallel; N layers of single-layer cavity structures (110) are stacked by static force to form a module cavity structure (120).

8. The method for designing a 3D printing cavity structure with controllable deformation according to claim 7, characterized in that: The logic for obtaining the target layout scheme: In the historical database, an overlay printing process is performed according to the target printing effect requirements to obtain an overlay printing logic line of the functional cavity structure (130); Arrange and plan multiple scheme layout modules and scheme evaluation coefficients corresponding to each scheme layout module according to the superimposed printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table; Comparing the stability of the scheme layout modules one by one according to the scheme evaluation table, thereby obtaining the scheme matching degree, and marking the scheme layout module with the highest scheme matching degree as the target layout scheme of the module cavity structure (120); Multiple layout modules and confirmed target layout plans are stored in a history database.

9. The method for designing a 3D printing cavity structure with controllable deformation according to claim 8, characterized in that: The functional cavity structure (130) comprises a supporting cavity area, a flexible deformation area and a lightweight folding area, wherein: a support cavity region for stabilizing the target body; Flexible deformation area, supporting the bending and expansion deformation of the target body; Lightweight folding area that supports target body folding and dynamic shape changes.

10. A system for designing a 3D printing cavity structure with controllable deformation, implemented based on a method for designing a 3D printing cavity structure with controllable deformation as claimed in any one of claims 5 to 9, characterized in that: include: A single-layer cavity structure analysis module (200), wherein a user inputs geometric structure parameters corresponding to the single-layer cavity structure (110), specifies geometric patterns corresponding to the outer protective structure (114) and the inner protective structure (115) as local restriction boundaries, and performs position calibration on the thin-sheet structure (111), the solidified structure (112), and the local hollow structure (113) within the local restriction boundaries, thereby determining the single-layer load capacity of the single-layer cavity structure (110); A module cavity structure analysis module (300) sets a printing layer height for the module cavity structure (120), matches different stacking methods of the multi-layer single-layer cavity structure (110) through static analysis, and marks the stacked multi-layer single-layer cavity structure (110) as a module cavity structure (120); The functional cavity structure analysis module (400) acquires a scheme layout pattern group and a corresponding scheme evaluation coefficient according to a printing target of the functional cavity structure (130), and selects a target layout scheme of the module cavity structure (120) based on the scheme evaluation coefficient; The integrated superposition control module (500) superimposes the different functional cavity structures (130) via the transition connection structure (140) to obtain a main cavity model (100) that ultimately meets the printing requirements.

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