A 3D printed cavity structure with controllable deformation, a cavity design method and system

Abstract

The present invention discloses a 3D printing cavity structure capable of controlled deformation, a cavity design method and system, including a positioning block. A user inputs geometric structure parameters corresponding to a single-layer cavity structure, clarifies local constraint boundaries, calibrates the position of the structure within the local constraint boundaries to determine the single-layer load capacity. A printing layer height is set for the modular cavity structure, and multiple single-layer cavity structures are matched with different stacking methods through static analysis. After stacking, a modular cavity structure is obtained. The target layout scheme of the modular cavity structure is screened according to the printing target of the functional cavity structure. Different functional cavity structures are stacked through a transition connection structure to obtain a final main cavity model that meets the printing requirements. Through the user input, static analysis, optimized stacking and the design of the transition connection structure, modular customization is carried out according to specific functional requirements. Through standardized module production, the error rate in one-piece forming is reduced, the production efficiency is improved, and the unit cost is reduced at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a 3D printed cavity structure capable of controlled deformation, a cavity design method and a system. Background Art

[0002] Currently, with the wide application of 3D printing technology in lightweight, functional integration and customized production, plastic products that better meet the standards can be quickly produced. For example, Chinese Patent Publication No. CN116330668A discloses a design and manufacturing method and system for a 3D printed cavity structure capable of controlled deformation. Through methods such as multi-material and local cross-linking strength control, heating and gas injection deformation mechanism, modular design and block printing, etc., the problems faced by traditional 3D printing technology in manufacturing deformable hollow structures, such as material waste, printing size limitation, single deformation control, high equipment cost, etc., are effectively solved. However, there are still the following problems:

[0003] 1. During the printing process of the same product, resin materials with different glass transition temperatures are required, which requires a more complex blending process, and the material properties may be unstable, resulting in subsequent quality problems of the product, increasing the R & D cost and technical threshold, and restricting the popularization of the technology.

[0004] 2. Although block printing and modular design are adopted, the printing size of DLP technology is still small, and it is difficult to manufacture large-sized daily necessities. Especially, it is difficult to adapt to complex or irregular geometries with a fixed honeycomb structure, which may lead to printing defects such as interlayer separation or deformation due to insufficient support, restricting the application of the technology in large-sized products.

[0005] 3. Currently, the technology can usually only achieve deformation in two states before and after expansion. In the case of continuous deformation, the surface of the printed part will be uneven, increasing the post-processing workload and restricting the flexibility and functionality of the design.

[0006] In view of this, the present invention provides a 3D printed cavity structure capable of controlled deformation, a cavity design method and a system to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a 3D printed cavity structure capable of controlled deformation, a cavity design method and a system to solve the problems in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] 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;

[0010] 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;

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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:

[0016] 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;

[0017] 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;

[0018] Step S3: Obtain the solution layout mode group and the corresponding solution evaluation coefficient according to the printing target of the functional cavity structure, and screen the target layout solution of the module cavity structure based on the solution evaluation coefficient;

[0019] Step S4: Superimpose different functional cavity structures through a transition connection structure to obtain a main cavity model that finally meets the printing requirements.

[0020] As a preferred technical solution of the second aspect of the present invention, the acquisition logic of the single-layer load capacity is as follows:

[0021] Extract the first boundary load capacity provided by the outer protection structure and the inner protection structure;

[0022] Extract the first strain load capacity provided by the thin sheet structure per unit length within the local limit boundary. Assume that the force of the cured structure fixed on the thin sheet structure of the preset unit length cancels out the loss of the first strain load capacity, and the first strain load capacity remains unchanged;

[0023] Taking the minimum number of cured structures and the largest area of the local hollow structure as constraints, thereby determining the corresponding positions of the thin sheet structure, the cured structure, and the local hollow structure;

[0024] Multiply the number of thin sheet structures by the first strain load capacity, and combine it with the first boundary load capacity to form the single-layer load capacity of the single-layer cavity structure.

[0025] As a preferred technical solution of the second aspect of the present invention, the acquisition logic of the module cavity structure:

[0026] The layer height of the single-layer cavity structure is N layers, where N is a positive integer;

[0027] Perform finite element modeling on the single-layer cavity structure of each layer. In the finite element model, mesh the transverse surface of the single-layer cavity structure. The intersection point of each mesh is a node, and the midpoint of the thin sheet structure and the cured structure is a stress point;

[0028] Perform a 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. The stress points include the layer height and the node positions of the current layer height;

[0029] Extract the proportionality factor corresponding to each layer height based on prior knowledge, and obtain the strain load capacity of the stress points corresponding to each layer height based on the proportionality factor. If the strain load capacity is within the preset strain load threshold range, then the single-layer cavity structures of the current layer height and the adjacent lower layer height are staggered and superimposed;

[0030] If the strain load capacity is greater than the maximum value of the preset strain load threshold, then the single-layer cavity structures of the current layer height and the adjacent lower layer height are spaced apart and superimposed;

[0031] If the strain load capacity is less than the minimum value of the preset strain load threshold, the single-layer cavity structures of the current floor height and the adjacent lower floor height are stacked in parallel;

[0032] Stack N single-layer cavity structures statically into a modular cavity structure.

[0033] As a preferred technical solution of the second aspect of the present invention, the acquisition logic of the target layout plan:

[0034] In the historical database, perform superposition printing processing according to the requirements of the target printing effect to obtain the superposition printing logic line of the functional cavity structure;

[0035] Arrange and plan multiple scheme layout modules and the corresponding scheme evaluation coefficients of each scheme layout module according to the superposition printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table;

[0036] Compare the stability of the scheme layout modules one by one according to the scheme evaluation table to obtain the scheme matching degree, and mark the scheme layout module with the highest scheme matching degree as the target layout plan of the modular cavity structure;

[0037] Store multiple scheme layout modules and the confirmed target layout plan in the historical database.

[0038] As a preferred technical solution of the second aspect of the present invention, the functional cavity structure includes a support cavity area, a flexible deformation area, and a lightweight folding area, where:

[0039] The support cavity area is used to stabilize the target main body;

[0040] The flexible deformation area supports the bending and expansion deformation of the target main body;

[0041] The lightweight folding area supports the folding and dynamic shape change of the target main body.

[0042] In the 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:

[0043] A single-layer cavity structure analysis module, where the user inputs the geometric structure parameters corresponding to the single-layer cavity structure, clarifies the geometric patterns corresponding to the outer protection structure and the inner protection structure as local restriction boundaries, and calibrates the positions of the thin sheet structure, the cured structure, and the local hollow structure within the local restriction boundaries, so as to determine the single-layer load capacity of the single-layer cavity structure;

[0044] The module cavity structure analysis module sets the printing layer height for the module cavity structure, matches different stacking methods for multiple single-layer cavity structures through static analysis, and marks the stacked multiple single-layer cavity structures as the module cavity structure;

[0045] The functional cavity structure analysis module obtains the scheme layout mode group and the corresponding scheme evaluation coefficient according to the printing target of the functional cavity structure, and filters the target layout scheme of the module cavity structure based on the scheme evaluation coefficient;

[0046] The integrated stacking control module stacks different functional cavity structures through a transition connection structure to obtain the main cavity model that finally meets the printing requirements.

[0047] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0048] Through user input, static analysis, optimized stacking, and the design of the transition connection structure, the present invention performs modular customization according to specific functional requirements. Through standardized module production, the error rate in one-piece molding is reduced, the production efficiency is improved, and the unit cost is reduced at the same time;

[0049] The mechanical properties of the single-layer cavity structure are evaluated through static analysis to ensure that each module can meet the design requirements after stacking, optimize the bearing capacity and stability of the overall structure, then match different stacking methods, reduce material waste, and improve the strength and stiffness of the structure at the same time; the smooth transition between different functional areas is also achieved through the transition connection structure. This design can avoid stress concentration and improve the overall performance of the structure. Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0051] Figure 1 It is the overall structure schematic diagram of the 3D printing cavity structure of the present invention.

[0052] Figure 2 It is the structure schematic diagram of the module cavity structure of the present invention.

[0053] Figure 3 It is the structure schematic diagram of the single-layer cavity structure of the present invention.

[0054] Figure 4 It is the structure schematic diagram of the transition connection structure of the present invention.

[0055] Figure 5It is a schematic structural diagram of parallel stacking in a stacking scenario of thin-sheet structures of the present invention.

[0056] 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.

[0057] 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.

[0058] Figure 8 This is a flow chart of the 3D printing cavity structure design method of the present invention.

[0059] Figure 9 This is a system framework diagram for designing a 3D printed cavity structure according to the present invention.

[0060] Description of reference numerals:

[0061] 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

[0062] 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.

[0063] 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.

[0064] Example 1

[0065] The present invention provides Figure 1-2A controllable deformable 3D printed cavity structure as shown includes a main cavity model 100 customized based on a target object. The main cavity model 100 includes a plurality of functionally cavity structures 130 connected in a crisscross manner, and realizes multi-state continuous deformation based on the cascading mode of the functionally cavity structures 130; thus, the main cavity model 100 is formed by superimposed printing.

[0066] It should be noted that: taking a vase as the target object, a main cavity model 100 is customized according to the shape of the vase. The shape of the vase can be a traditional cylindrical shape, or a more complex geometric shape, such as a wavy shape or a polygonal shape; taking the outer surface of the vase as the boundary, a wall thickness value is specified, for example, 2 mm, to generate a definite 3D printed hollow structure with a specified wall thickness value, and a main cavity model 100 is created based on the 3D printed hollow structure; during the 3D printing process, a single-layer cavity structure 110 is printed on a plane, and then all the functionally cavity structures 130 are superimposed into a complete main cavity model 100 through an interleaved superimposing technique.

[0067] The functionally cavity structures 130 are sliced according to the functional regions divided by the main cavity model 100, and the functionally cavity structures 130 are connected by a transition connection structure 140.

[0068] During the 3D printing process, the connection between two different functional regions, such as a support region, a flexible deformation region, and a lightweight folding region, is a key issue. A progressive transition structure is designed between the two functional regions to make the material properties and geometric shapes change gradually rather than suddenly. Therefore, as Figure 4 shown:

[0069] The transition connection structure 140 includes upper and lower symmetric connection parts 141; the connection parts 141, as the main part of the transition connection structure, are used to connect the modular cavity structures 120 of two different functional regions. The upper and lower symmetric design can ensure the same mechanical properties of the structure in two directions and facilitate the realization of two-way transition.

[0070] A partition 142 is arranged between the two connection parts 141, and through holes 143 are arranged on the partition 142;

[0071] Among them: the partition 142 plays a role of separation and support between the two connection parts 141. The internal spaces of the two functional regions are separated to avoid mutual interference between different functional regions. For example, between the flexible deformation region and the support region, the partition can prevent the mixing of flexible materials and rigid materials. Most importantly, it can also provide additional support strength to ensure the structural stability of the transition region.

[0072] The provision of the through-hole 143 can disperse stress, avoid the emergence of stress concentration points, and achieve functional coupling between the two functional regions. For example, between the flexible deformation region and the support region, the through-hole can allow some flexible materials to pass through, thereby achieving a gradual transition between flexibility and rigidity.

[0073] In practical applications, the disadvantages of coupling different materials are concentrated at the transition connection structure 140, enabling the prior art to perform centralized processing on the transition connection structure 140. For example, for two resin materials with different glass transition temperatures, a design and manufacturing method and system of a 3D printing cavity structure with controllable deformation disclosed in Patent No. CN116330668A can be used, and the deformation control method is simpler and more convenient.

[0074] The functional cavity structure 130 is divided into multiple 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;

[0075] It should be noted that: a honeycomb support structure is added inside each functional cavity structure 130. Currently, the commonly used honeycomb support structure can be manually designed in CAD software or automatically generated using specialized 3D printing slicing software such as Cura or PrusaSlicer. However, even in the same functional region, the printing requirements corresponding to different printing targets will vary. Therefore, it is also necessary to divide the module cavity structure 120 in the same functional region. The more detailed the divided area, the clearer the printing target, and the lower the probability of errors. In the same module cavity structure 120, it is made of the same type of resin material formed in one step. The resin material includes standardized resin materials and composite materials, which is convenient for mass production and quality control, enabling each single-layer cavity structure 110 corresponding to the slice of each functional region to have specific functions such as high strength, flexibility, and deformation control. The cascaded thin sheet structures 111 cooperate mechanically to achieve the deformation of the overall structure and support complex deformation control, such as bending, expansion, folding, etc.

[0076] The single-layer cavity structure 110 includes an outer protective structure 114 and an inner protective structure 115. Between the outer protective structure 114 and the inner protective structure 115, there are one or more combinations of multiple thin sheet structures 111, curing structures 112, and local hollow structures 113. The thin sheet structures 111, the outer protective structure 114, and the inner protective structure 115 are connected to each other through the curing structure 112, and a region formed by enclosing one or more of the thin sheet structures 111, the outer protective structure 114, and the inner protective structure 115 is the local hollow structure 113.

[0077] It should be noted that the thin sheet structure 111 serves as a support purpose, and adjacent thin sheet structures 111 are connected by a curing structure 112 for curing purposes; after the thin sheet structure 111 and the curing structure 112 are connected, they enclose a partial hollow structure 113, which is used for functions such as weight reduction, heat dissipation, and fluid channels, realizing lightweight and function integration. The deformable cavity technology is used inside the partial hollow structure 113 to dynamically adjust the internal support structure according to the shape of the vase to optimize the stress distribution and material use.

[0078] In summary, for the controllable deformation 3D printed hollow structure described in this embodiment, a single-layer cavity structure 110 is printed on a plane. Based on the single-layer cavity structure 110, complex deformation controls such as bending, expansion, and folding are supported. The deformed thin sheet structure 111 forms a basic framework with honeycomb-like support functions. In practical applications, functions such as weight reduction, heat dissipation, and fluid channels are also realized through the partial hollow structure 113, achieving lightweight and function integration; the single-layer cavity structure 110 is printed at a preset position to form one of the functional cavity structures 130. Through the ideas of modularization, standardization, and multi-state continuous deformation, all the functional cavity structures 130 are combined into a complete main cavity model 100 through a superposition combination logic, realizing the customized manufacturing of the controllable deformation 3D printed hollow structure. Especially when there is still room for improvement in the current material properties, it takes time to test its stability. Therefore, without changing the current material properties, the deformation control accuracy, printing size, and cost are improved by changing the production method, which has practical economic benefits.

[0079] Embodiment 2:

[0080] As Figure 3 shown, the parts not described in detail in this embodiment are as shown in Embodiment 1. This embodiment provides a controllable deformation 3D printed cavity. A reserved installation hole 116 is provided on the single-layer cavity structure 110, and a sensor is matched in the reserved installation hole 116 according to the functional requirements of the single-layer cavity structure 110.

[0081] During the process of 3D printing the thin sheet structure, the sensor is embedded in the reserved installation hole 116 at the corresponding predetermined position of the single-layer cavity structure 110. When printing to the single-layer cavity structure 110 corresponding to a certain layer, the printing is paused, the sensor is placed at the predetermined position, and then the printing continues. Using the multi-material printing technology, the sensor is combined with the material of the single-layer cavity structure 110 to reduce subsequent assembly steps.

[0082] Specifically, the printing parameters of the target object to be printed are monitored in real time through the sensor. The printing parameters include the material data, shape state, temperature value, and pressure value of the target object, realizing the controllable deformation and real-time monitoring intelligent control of the hollow structure; the sensor includes:

[0083] Strain sensor: Monitor the deformation and stress distribution of the thin sheet structure, and monitor the deformation state;

[0084] Temperature sensor: Monitor the temperature change of the thin sheet structure, used for thermal response control, and monitor the temperature change;

[0085] Pressure sensor: Monitor the air pressure inside the hollow structure or the external pressure;

[0086] Acceleration sensor: Monitor the vibration or motion state of the thin sheet structure;

[0087] Humidity sensor: Monitor the environmental humidity, suitable for specific application scenarios such as biomedical devices.

[0088] Real-time monitor the status of each area such as deformation, temperature, pressure, humidity, etc. through the integrated sensor, send the sensor data to the control terminal, and the user 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 overloading is detected, the support cavity area issues an alarm.

[0089] Embodiment 3:

[0090] As Figure 8 shown, the parts not detailed in this embodiment are as shown in Embodiment 1. This embodiment provides a method for designing a 3D printed cavity structure with controllable deformation, which is applied to the design modification of the 3D printed cavity structure. The 3D printed cavity structure includes a plurality of functionally cavity structures 130 longitudinally and staggeredly connected. The functionally cavity structure 130 divides into a plurality of modular cavity structures 120 according to the printing target, and each modular cavity structure 120 is printed by multiple single-layer cavity structures 110; it includes the following steps:

[0091] Step S1: The user inputs the geometric structure parameters corresponding to the single-layer cavity structure 110, clarifies the geometric patterns corresponding to the outer protective structure 114 and the inner protective structure 115 as local limiting boundaries, and calibrates the positions of the thin sheet structure 111, the cured structure 112, and the local hollow structure 113 within the local limiting boundaries, so as to determine the single-layer load capacity of the single-layer cavity structure 110.

[0092] Exemplarily, the user inputs the geometric parameters of the single-layer cavity structure 110 through the design software, 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 structure is connected by the cured structure 112 to ensure the stability of the overall structure. Local cavity structures are arranged at the staggered parts of the thin sheet structure for weight reduction and expansion functions.

[0093] In addition, it should be noted that the single-layer load capacity represents the bearing capacity of the single-layer cavity structure 110 when bearing 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 enhancing the performance and reliability of the entire 3D printed cavity structure. The acquisition logic of the single-layer load capacity is as follows:

[0094] Extract the first boundary load capacity provided by the outer protection structure 114 and the inner protection structure 115;

[0095] Extract the first strain load capacity provided by the thin sheet structure 111 per unit length within the local restriction boundary. Assume that the force of the cured structure 112 fixed on the thin sheet structure 111 of the preset unit length cancels out the loss of the first strain load capacity, maintaining the first strain load capacity unchanged;

[0096] Perform finite element modeling on the single-layer cavity structure 110. In the finite element model, mesh the surface of the single-layer cavity structure 110. The intersection point of each mesh is a node, and the midpoint of the thin sheet structure 111 and the cured structure 112 is the stress point;

[0097] Taking the minimum number of cured structures 112 and the largest area of the local hollow structure 113 as constraints, thereby determining the corresponding positions of the thin sheet structure 111, the cured structure 112, and the local hollow structure 113;

[0098] Multiply the number of thin sheet structures 111 by the first strain load capacity, and combine it with the first boundary load capacity to form the single-layer load capacity of the single-layer cavity structure 110.

[0099] Step S2: Set the printing layer height for the module cavity structure 120. Match different stacking methods for multiple single-layer cavity structures 110 through static analysis, and mark the stacked multiple single-layer cavity structures 110 as the module cavity structure 120;

[0100] It should be noted that static analysis is performed on each module. As Figures 5-7 shown, the stacking methods include three stacking methods: staggered stacking, parallel stacking, and spaced stacking. Considering different stacking methods, the impact on the module load capacity is considered.

[0101] Specifically, the acquisition logic of the module cavity structure 120:

[0102] The layer height of the single-layer cavity structure 110 is N layers, where N is a positive integer;

[0103] Perform finite element modeling on each layer of the single-layer cavity structure 110. In the finite element model, mesh the transverse surface of the single-layer cavity structure 110. The intersection point of each mesh is a node, and the midpoint of the thin sheet structure 111 and the cured structure 112 is the stress point;

[0104] Perform a static analysis of the longitudinal floor height in the finite element model to obtain the strain load capacity of the first N floors of the single-layer cavity structure 110, that is, the strain load capacity of all stress points, where the stress points include the floor height and the node positions of the current floor height;

[0105] Extract the proportionality factor corresponding to each floor height based on prior knowledge, and obtain the strain load capacity of the stress points corresponding to each floor height based on the proportionality factor. If the strain load capacity is within the preset strain load threshold range, then the single-layer cavity structures 110 of the current floor height and the adjacent lower floor height are stagger-stacked;

[0106] If the strain load capacity is greater than the maximum value of the preset strain load threshold, then the single-layer cavity structures 110 of the current floor height and the adjacent lower floor height are spaced-apart stacked;

[0107] If the strain load capacity is less than the minimum value of the preset strain load threshold, then the single-layer cavity structures 110 of the current floor height and the adjacent lower floor height are parallel stacked;

[0108] Stack the N single-layer cavity structures 110 statically into a modular cavity structure 120.

[0109] Step S3: Obtain the scheme layout mode group and the corresponding scheme evaluation coefficients according to the printing target of the functional cavity structure 130, and screen the target layout scheme of the modular cavity structure 120 based on the scheme evaluation coefficients;

[0110] Specifically, the acquisition logic of the target layout scheme:

[0111] In the historical database, perform superposition printing processing according to the requirements of the target printing effect to obtain the superposition printing logic line of the functional cavity structure 130;

[0112] Arrange and plan multiple scheme layout modules and the corresponding scheme evaluation coefficients for each scheme layout module according to the superposition printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table;

[0113] Compare the stability of the scheme layout modules one by one according to the scheme evaluation table 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 modular cavity structure 120;

[0114] Store multiple scheme layout modules and the confirmed target layout scheme in the historical database.

[0115] Step S4: Stack different functional cavity structures 130 through the transition connection structure 140 to obtain the main cavity model 100 that finally meets the printing requirements.

[0116] Specifically, the division logic of the functional cavity structure 130 is as follows:

[0117] The functional cavity structure 130 includes a support cavity area, a flexible deformation area, and a lightweight folding area; it realizes the perfect combination of structural stability, complex deformation ability, and lightweight, and has broad application prospects. Taking a vase as the target object, a wavy geometric design is adopted to increase aesthetics and deformation possibilities, and the wall thickness is 2 mm to ensure structural strength while achieving lightweight; among them:

[0118] The support cavity area is used to stabilize the target object. Taking a vase as an example, it is mainly reflected in the base, providing structural stability and load-bearing capacity. A high-strength resin material is used, and the interior is filled with a high-density honeycomb support structure to enhance the compressive performance and ensure that the base can bear the weight of the vase and its contents.

[0119] The flexible deformation area supports bending and expansion. Taking a vase as an example, it is mainly reflected in the bottle body, changing into different shapes to meet the diverse needs of users. A flexible resin material is used, and the bending deformation of the vase is realized through the flexible thin sheet structure 111 in the middle area, and the expansion is realized through the deformable cavity technology in the local hollow structure 113 to ensure that the bottle body can achieve bending and expansion deformation.

[0120] The lightweight folding area supports folding and dynamic shape changes. A lightweight composite material is used, and the interior is designed as an ultra-low density honeycomb support structure to further reduce the weight, ensuring that the mouth part of the bottle is light in weight and easy to deform, realizing 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.

[0121] Based on prior knowledge, the printing target of the target object is structurally divided to determine the functional cavity structure 130 corresponding to the main cavity model 100, and the cavity structure geometric parameters of the functional cavity structure 130 are extracted.

[0122] Embodiment 4:

[0123] As Figure 9 shown, the parts not detailed in this embodiment are as shown in Embodiment 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. Each module is connected by wire or wirelessly;

[0124] Single-layer cavity structure analysis module 200. The user inputs the geometric structure parameters corresponding to the single-layer cavity structure 110, clarifies the geometric patterns corresponding to the outer protection structure 114 and the inner protection structure 115 as local restriction boundaries, and calibrates the positions of the thin sheet structure 111, the solidified structure 112, and the local hollow structure 113 within the local restriction boundaries, so as to determine the single-layer load capacity of the single-layer cavity structure 110;

[0125] Module cavity structure analysis module 300. Set the printing layer height for the module cavity structure 120, match different stacking methods for multiple single-layer cavity structures 110 through static analysis, and mark the stacked multiple single-layer cavity structures 110 as the module cavity structure 120;

[0126] Functional cavity structure analysis module 400. Obtain the scheme layout mode group and the corresponding scheme evaluation coefficients according to the printing target of the functional cavity structure 130, and screen the target layout scheme of the module cavity structure 120 based on the scheme evaluation coefficients;

[0127] Integrated stacking control module 500. Stack different functional cavity structures 130 through the transition connection structure 140 to obtain the main cavity model 100 that finally meets the printing requirements.

[0128] The acquisition logic of the single-layer load capacity is as follows:

[0129] Extract the first boundary load capacity provided by the outer protection structure 114 and the inner protection structure 115;

[0130] Extract the first strain load capacity provided by the thin sheet structure 111 per unit length within the local restriction boundary. Assume that the force of the solidified structure 112 fixed on the thin sheet structure 111 of the preset unit length cancels out the loss of the first strain load capacity, and the first strain load capacity remains unchanged;

[0131] Taking the minimum number of solidified structures 112 and the largest area of the local hollow structure 113 as constraints, determine the corresponding positions of the thin sheet structure 111, the solidified structure 112, and the local hollow structure 113;

[0132] Multiply the number of thin sheet structures 111 by the first strain load capacity, and combine it with the first boundary load capacity to form the single-layer load capacity of the single-layer cavity structure 110.

[0133] The acquisition logic of the module cavity structure 120:

[0134] The layer height of the single-layer cavity structure 110 is N layers, where N is a positive integer;

[0135] Perform finite element modeling on the single-layer cavity structure 110 of each layer. In the finite element model, mesh the lateral surface of the single-layer cavity structure 110. The intersection point of each mesh is a node, and the midpoints of the thin sheet structure 111 and the cured structure 112 are stress points;

[0136] Perform a 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. The stress points include the layer height and the node positions of the current layer height;

[0137] Extract the proportionality factors corresponding to each layer height based on prior knowledge, and obtain the strain load capacity of the stress points corresponding to each layer height based on the proportionality factors. If the strain load capacity is within the preset strain load threshold range, then the single-layer cavity structures 110 of the current layer height and the adjacent lower layer height are staggered and superimposed;

[0138] If the strain load capacity is greater than the maximum value of the preset strain load threshold, then the single-layer cavity structures 110 of the current layer height and the adjacent lower layer height are spaced apart and superimposed;

[0139] If the strain load capacity is less than the minimum value of the preset strain load threshold, then the single-layer cavity structures 110 of the current layer height and the adjacent lower layer height are parallelly superimposed;

[0140] Stack N single-layer cavity structures 110 statically into a modular cavity structure 120.

[0141] The acquisition logic of the target layout scheme:

[0142] In the historical database, perform overlay printing processing according to the requirements of the target printed effect to obtain the overlay printing logic line of the functional cavity structure 130;

[0143] Sort out and plan multiple scheme layout modules and the corresponding scheme evaluation coefficients of each scheme layout module according to the overlay printing logic line, and list the scheme layout modules and the corresponding scheme evaluation coefficients to obtain a scheme evaluation table;

[0144] Compare the stability of the scheme layout modules one by one according to the scheme evaluation table 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 modular cavity structure 120;

[0145] Store multiple scheme layout modules and the confirmed target layout scheme in the historical database.

[0146] The functional cavity structure 130 includes a support cavity area, a flexible deformation area, and a lightweight folding area, where:

[0147] The support cavity area is used to stabilize the target body;

[0148] Flexible deformation area, supporting bending and expansion deformation of the target body;

[0149] Lightweight folding area, supporting folding and dynamic shape change of the target body.

[0150] Only some exemplary embodiments of the present invention are described above by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description 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, Including customizing and setting a main body cavity model (100) based on a target main body. The main body cavity model (100) includes a plurality of longitudinally staggered and connected functional cavity structures (130), and the functional cavity structures (130) are connected by a transition connection structure (140). The transition connection structure (140) includes symmetric connection parts (141) up and down. A partition plate (142) is arranged between the two connection parts (141), and through holes (143) are arranged on the partition plate (142). The functional cavity structure (130) is divided into a plurality of module cavity structures (120) according to the printing target. Each module cavity structure (120) is printed by multiple single-layer cavity structures (110). A printing layer height is set for the module cavity structure (120), and different superposition methods of the multiple single-layer cavity structures (110) are matched through static analysis. The superimposed multiple single-layer cavity structures (110) are marked as the module cavity structure (120). The single-layer cavity structure (110) includes an outer protection structure (114) and an inner protection structure (115). One or more combinations of a plurality of thin sheet structures (111), curing structures (112), and partial hollow structures (113) are arranged between the outer protection structure (114) and the inner protection structure (115). Adjacent thin sheet structures (111) are connected to each other through the curing structure (112). An area enclosed by one or more of the thin sheet structures (111), curing structures (112), outer protection structure (114), and inner protection structure (115) forms a partial hollow structure (113). A reserved installation hole (116) is arranged on the single-layer cavity structure (110), and a sensor is matched in the reserved installation hole (116) according to the functional requirements of the single-layer cavity structure (110).

2. A method for designing a controllable deformable 3D printing cavity structure, used for designing a controllable deformable 3D printing cavity structure as claimed in claim 1, 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: Including the following steps: Step S1: The user inputs the geometric structure parameters corresponding to the single-layer cavity structure (110), clarifies the geometric patterns corresponding to the outer protection structure (114) and the inner protection structure (115) as local limiting boundaries, and calibrates the positions of the thin sheet structures (111), curing structures (112), and partial hollow structures (113) within the local limiting boundaries, so as to determine the single-layer load capacity of the single-layer cavity structure (110). Step S2: Set the printing layer height for the module cavity structure (120), match different superposition methods of the multiple single-layer cavity structures (110) through static analysis, and mark the superimposed multiple single-layer cavity structures (110) as the module cavity structure (120). Step S3: Obtain a scheme layout mode group and corresponding scheme evaluation coefficients according to the printing target of the functional cavity structure (130), and screen the target layout scheme of the module cavity structure (120) based on the scheme evaluation coefficients. Step S4: Superimpose different functional cavity structures (130) through the transition connection structure (140) to obtain the final main body cavity model (100) that meets the printing requirements.

3. A method for designing a 3D printed cavity structure with controllable deformation according to claim 2, characterized in that, The acquisition logic of the single-layer load capacity is: Extract the first boundary load capacity provided by the outer protection structure (114) and the inner protection structure (115); Extract the first strain load capacity provided by the sheet structure (111) per unit length within the local restricted boundary. Assume that the force of the cured structure (112) fixed on the sheet structure (111) of the preset unit length cancels out the loss of the first strain load capacity, maintaining the first strain load capacity unchanged; With the minimum number of cured structures (112) and the largest area of the local hollow structure (113) as constraints, determine the corresponding positions of the sheet structure (111), the cured structure (112), and the local hollow structure (113); Multiply the number of sheet structures (111) by the first strain load capacity and combine it with the first boundary load capacity to form the single-layer load capacity of the single-layer cavity structure (110).

4. A method for designing a 3D printed cavity structure with controllable deformation according to claim 3, characterized in that, The acquisition logic of the modular cavity structure (120): The height of the single-layer cavity structure (110) is N layers, where N is a positive integer; Perform finite element modeling on each layer of the single-layer cavity structure (110). In the finite element model, mesh the transverse surface of the single-layer cavity structure (110). The intersection point of each mesh is a node, and the midpoint of the sheet structure (111) and the cured structure (112) is the stress point; Perform a static analysis on the longitudinal 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. The stress points include the height and the node positions of the current height; Extract the proportionality factor corresponding to each height based on prior knowledge, and obtain the strain load capacity of the stress points corresponding to each height based on the proportionality factor. If the strain load capacity is within the preset strain load threshold range, then stagger and stack the single-layer cavity structures (110) of the current height and the adjacent lower height; If the strain load capacity is greater than the maximum value of the preset strain load threshold, then stack the single-layer cavity structures (110) of the current height and the adjacent lower height with a gap; If the strain load capacity is less than the minimum value of the preset strain load threshold, then stack the single-layer cavity structures (110) of the current height and the adjacent lower height in parallel; Stack the N layers of single-layer cavity structures (110) statically to form the modular cavity structure (120).

5. A method for designing a 3D printed cavity structure with controllable deformation according to claim 4, characterized in that, The acquisition logic of the target layout plan: In the historical database, perform overlay printing processing according to the requirements of the target printing effect to obtain the overlay printing logic line of the functional cavity structure (130); Sort and plan multiple scheme layout modules and the corresponding scheme evaluation coefficients for each scheme layout module according to the overlay 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 to obtain the scheme matching degree, and mark the scheme layout module with the highest scheme matching degree as the target layout plan of the modular cavity structure (120); Store multiple scheme layout modules and the confirmed target layout plan in the historical database.

6. A method for designing a 3D printed cavity structure capable of controlled deformation according to claim 5, characterized in that The functional cavity structure (130) includes a support cavity area, a flexible deformation area, and a lightweight folding area, where: Support cavity area for stabilizing the target body; Flexible deformation area for supporting the bending and expansion deformation of the target body; Lightweight folding area for supporting the folding and dynamic shape change of the target body.

7. A 3D printing cavity structure design system with controllable deformation, which is implemented based on the method for designing a 3D printing cavity structure with controllable deformation according to any one of claims 2-6, characterized in that Including: Single-layer cavity structure analysis module (200), where the user inputs the geometric structure parameters corresponding to the single-layer cavity structure (110), defines the geometric patterns corresponding to the outer protection structure (114) and the inner protection structure (115) as local limiting boundaries, and calibrates the positions of the thin sheet structure (111), the solidified structure (112), and the local hollow structure (113) within the local limiting boundaries, so as to determine the single-layer load capacity of the single-layer cavity structure (110); Module cavity structure analysis module (300), setting the printing layer height for the module cavity structure (120), matching different superposition methods for multiple single-layer cavity structures (110) through static analysis, and marking the superimposed multiple single-layer cavity structures (110) as the module cavity structure (120); Functional cavity structure analysis module (400), obtaining the scheme layout mode group and the corresponding scheme evaluation coefficient according to the printing target of the functional cavity structure (130), and screening the target layout scheme of the module cavity structure (120) based on the scheme evaluation coefficient; Integrated superposition control module (500), superimposing different functional cavity structures (130) through the transition connection structure (140) to obtain the final main cavity model (100) that meets the printing requirements.

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