Method for manufacturing a sheet, 3D printing device and computer readable storage medium

Abstract

The application discloses a plate preparation method, a 3D printing device and a computer readable storage medium, and belongs to the technical field of plate processing. The method comprises the following steps: obtaining an axial bending stiffness distribution corresponding to a target shape curve of a to-be-prepared plate, and generating a one-stroke printing path with variable density according to the axial bending stiffness distribution; preparing a reinforcing layer of the to-be-prepared plate according to the one-stroke printing path; obtaining a base material layer of the to-be-prepared plate, and connecting the reinforcing layer and the base material layer into a composite plate; and applying end constraints and loads to the composite plate to obtain the to-be-prepared plate. The application connects the reinforcing layer and the base material layer, applies constraints and loads, and finally forms a plate meeting the target shape curve, so that the preparation cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plate processing, in particular to a plate preparation method, a 3D printing device and a computer readable storage medium. BACKGROUND

[0002] Active bending structure refers to a structure form that uses the internal force generated by the elastic bending deformation of a material to resist external load, which is commonly used in plates and can be used for creative furniture, wall decoration, product display, etc.

[0003] In related technologies, since the profile curves of different products are different, a mold needs to be customized in advance according to product requirements for each type of product, and then the original plate is processed by hot bending with the customized mold to form an active bending plate.

[0004] However, if the customized mold cannot be used continuously or the processed plate is too small, etc., the mold opening cost will be much higher than the product benefit, i.e., the mold opening cost is too high.

[0005] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0006] The main purpose of the present application is to provide a plate preparation method, a 3D printing device and a computer readable storage medium, which aims to solve the technical problem of high mold opening cost.

[0007] To achieve the above purpose, the present application provides a plate preparation method, which comprises the following steps:

[0008] Obtaining the axial bending stiffness distribution corresponding to the target shape curve of the plate to be prepared, and generating a one-stroke printing path with variable density according to the axial bending stiffness distribution;

[0009] According to the one-stroke printing path, a reinforcing layer of the plate to be prepared is prepared;

[0010] Obtaining a base material layer of the plate to be prepared, and connecting the reinforcing layer and the base material layer into a composite plate;

[0011] Applying end constraints and loads to the composite plate to obtain the plate to be prepared.

[0012] Optionally, the step of obtaining the axial bending stiffness distribution corresponding to the target shape curve of the plate to be prepared comprises:

[0013] Obtaining the target shape curve of the plate to be prepared, and the end constraints and loads required to achieve the target shape curve;

[0014] segmenting the target profile curve to obtain a plurality of nodes, and determining complementary angles between adjacent nodes, distances between adjacent nodes, and distances between interval nodes;

[0015] converting the end constraints and the load into shearing forces acting on the plurality of nodes by a graphical statics algorithm;

[0016] substituting the shearing forces acting on the plurality of nodes, the complementary angles between adjacent nodes, the distances between adjacent nodes, and the distances between interval nodes into a mathematical relationship of internal forces in a graphical statics bending member to obtain an axial bending stiffness distribution.

[0017] Optionally, the step of generating a variable-density one-stroke printing path according to the axial bending stiffness distribution comprises:

[0018] obtaining an elastic modulus of a reinforcing layer material of the plate to be prepared, and determining a cross-sectional moment of inertia distribution corresponding to the axial bending stiffness distribution in combination with a mathematical relationship between the axial bending stiffness distribution and the cross-sectional moment of inertia;

[0019] determining cross-sectional dimensions of the cross-sectional moment of inertia distribution based on a sampling method, and generating a variable-density one-stroke printing path according to the cross-sectional dimensions.

[0020] Optionally, the step of determining cross-sectional dimensions of the cross-sectional moment of inertia distribution based on a sampling method, and generating a variable-density one-stroke printing path according to the cross-sectional dimensions comprises:

[0021] determining a plurality of discrete points according to the cross-sectional moment of inertia distribution, and connecting adjacent discrete points into triangles, and drawing perpendicular bisectors of sides of the triangles;

[0022] determining positions of a plurality of polygons based on intersection points of the perpendicular bisectors;

[0023] determining cross-sectional dimensions of the polygons according to the cross-sectional moment of inertia distribution, the elastic modulus, and the positions of the polygons, and generating a variable-density one-stroke printing path according to the cross-sectional dimensions of the polygons.

[0024] Optionally, after the step of determining dimensions of the polygons according to the cross-sectional moment of inertia distribution and the positions of the polygons, and generating a variable-density one-stroke printing path according to the positions of the polygons and the dimensions of the polygons, the method further comprises:

[0025] judging whether a density parameter corresponding to the one-stroke printing path meets a preparation parameter of a processing technology;

[0026] if not, adjusting the target profile curve, performing the steps of obtaining the target profile curve of the plate to be prepared and the end constraints and loads required to reach the target profile curve;

[0027] if yes, performing the step of preparing the reinforcing layer of the plate to be prepared according to the one-pen printing path.

[0028] Optionally, the step of preparing the reinforcing layer of the plate to be prepared according to the one-pen printing path comprises:

[0029] determining the printing process parameters of the 3D printing device with reference to the one-pen printing path;

[0030] controlling the 3D printing device to print the reinforcing layer of the plate to be prepared according to the printing process parameters.

[0031] Optionally, the step of applying end constraints and loads to the composite plate to obtain the plate to be prepared comprises:

[0032] obtaining the end constraint conditions and load conditions required to reach the target profile curve;

[0033] constraining both ends of the composite plate based on the end constraint conditions and applying loads to the composite plate based on the load conditions to obtain the plate to be prepared.

[0034] Optionally, after the step of constraining both ends of the composite plate based on the end constraint conditions and applying loads to the composite plate based on the load conditions to obtain the plate to be prepared, comprising:

[0035] calculating the matching rate of the fitting profile curve of the plate to be prepared and the target profile curve;

[0036] if the matching rate does not reach the preset passing rate, adjusting the end constraint conditions and the load conditions, and performing the step of constraining both ends of the composite plate based on the end constraint conditions and applying loads to the composite plate based on the load conditions to obtain the plate to be prepared.

[0037] In addition, to achieve the above-mentioned purpose, the present application also provides a 3D printing device, comprising a memory, a processor and a plate preparation program stored on the memory and executable on the processor, the plate preparation program is configured to implement the steps of the plate preparation method.

[0038] In addition, to achieve the above object, the application further provides a computer readable storage medium, wherein the computer readable storage medium stores a plate preparation program, and the plate preparation program realizes the steps of the plate preparation method when executed by a processor.

[0039] In one technical solution of the application, the axial bending stiffness distribution corresponding to the target shape curve is obtained, and a one-stroke printing path with variable density is generated according to the axial bending stiffness distribution. Further, a reinforcing layer is prepared according to the one-stroke printing path, and then the reinforcing layer and the substrate layer are connected into a composite plate. The composite plate is subjected to end constraint and load to obtain the plate to be prepared. Compared with the hot bending processing technology, the present solution directly uses the reinforcing layer to achieve good bending performance of the plate, without the need for pre-customized molds, thereby eliminating high mold opening costs and significantly reducing the investment cost. Moreover, unlike the hot bending processing technology which requires a large number of processing links such as wet softening, aging, storage forming and the like, the present solution directly uses a mechanical arm, a fixed support and the like to realize bending and shape finding, thereby simplifying the links of plate preparation, shortening the overall preparation time of the plate and effectively improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Flowchart of the first embodiment of the plate preparation method of the application;

[0041] Figure 2 Flowchart of the second embodiment of the plate preparation method of the application;

[0042] Figure 3 Shear force diagram in the second embodiment of the plate preparation method of the application;

[0043] Figure 4 Flowchart of the third embodiment of the plate preparation method of the application;

[0044] Figure 5 One-stroke printing path diagram in the third embodiment of the plate preparation method of the application;

[0045] Figure 6 Flowchart of the fourth embodiment of the plate preparation method of the application;

[0046] Figure 7 Plate structure level diagram in the fourth embodiment of the plate preparation method of the application;

[0047] Figure 8 Fitting effect diagram in the fourth embodiment of the plate preparation method of the application;

[0048] Figure 9 Flowchart of the fifth embodiment of the plate preparation method of the application;

[0049] Figure 10 A flowchart of a sixth embodiment of the plate manufacturing method of the present application is shown in FIG. 6.

[0050] Figure 11 A structural diagram of a 3D printing device for a hardware operating environment involved in the embodiment of the present application is shown in FIG. 3.

[0051] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0053] In the fields of creative furniture and wall decoration, plate materials with different shapes are often used. The common method for manufacturing custom curved plate materials at present is to use a custom mold for hot bending processing, that is, the original veneer is first cut, glued, aged, and hot-pressed and kept for a certain period of time to process the original veneer into a plate blank, and then the plate blank is placed in a custom mold to form a laminated curved plate by using high-frequency heating hot pressing.

[0054] The profile curves of different products are different. If the hot bending processing technology is used, different molds need to be customized for each type of product. However, the cost of opening a mold is expensive, and if the quality of the mold is not good enough, it cannot be used continuously, or the number of plate materials processed by the mold is too small, which will result in the cost of opening a mold being much higher than the product revenue, that is, the cost of opening a mold is too high.

[0055] The present application proposes a plate manufacturing method, which prepares a reinforcing layer based on a target profile curve, and then connects, applies constraints and loads to the reinforcing layer and the substrate layer to finally form a plate material that meets the target profile curve. The entire process does not need to use a custom mold, so the manufacturing cost can be reduced.

[0056] In order to better understand the above technical solutions, the exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0057] The plate manufacturing method provided in the embodiments of the present application is described below with reference to Figure 1 , Figure 1 A flowchart of a first embodiment of the plate manufacturing method of the present application is shown in FIG. 1.

[0058] In the present embodiment, the plate manufacturing method comprises:

[0059] Step S11: Obtain the axial bending stiffness distribution corresponding to the target shape curve of the to-be-prepared plate, and generate a variable-density one-stroke printing path according to the axial bending stiffness distribution;

[0060] It can be understood that the target shape curve refers to the side profile curve of the product surface shape, such as a semicircular arc, and the axial bending stiffness distribution is used to represent the distribution of the ability of each point on the target shape curve to resist bending deformation, such as the middle part of the curve being weak in bending resistance and easy to bend, and the two ends of the curve being strong in bending resistance and not easy to bend.

[0061] Alternatively, the axial bending stiffness distribution corresponding to the target shape curve is obtained by analyzing the target shape curve through a graphical statics algorithm, or the axial bending stiffness distribution is directly read from the memory, and the embodiment is not limited specifically. Further, the axial bending stiffness distribution is analyzed, the strong density is set corresponding to the part with strong bending stiffness, the weak density is set corresponding to the part with weak bending stiffness, and the variable-density one-stroke printing path is generated by summarizing, so that the axial bending stiffness distribution corresponding to the target shape curve is embodied by the density change of the one-stroke printing path.

[0062] It should be noted that the density mentioned here can be embodied by specific parameters of the printing path, such as printing height, printing width, material type used during printing, etc., and the embodiment is not limited specifically.

[0063] Step S12: According to the one-stroke printing path, a reinforcing layer of the to-be-prepared plate is prepared;

[0064] It can be understood that in the production process of the to-be-prepared plate, if a single-piece integrated forming method is used, it is difficult to accurately realize a complex structure design due to the consistent bending characteristics of the homogeneous material, therefore, the to-be-prepared plate can be limited to a composite plate, which is divided into a reinforcing layer and a base material layer, wherein the base material layer is the main part of the to-be-prepared plate, and the reinforcing layer is used to support the base material layer to bend and ensure that the composite plate as a whole can be bent to a target shape.

[0065] It should be noted that the reinforcing layer and the base material layer can be made of different materials, such as a plastic material for the reinforcing layer and a wood material for the base material layer, and the embodiment is not limited specifically, and the skilled person can set it according to user demand, use scenario, product model, etc., including but not limited to carbon fiber plate, metal plate, acrylic plate, plywood, modified plastic plate, such as limiting the materials of the reinforcing layer and the base material layer to non-combustible materials in a certain fireproof scene, as long as the bending stiffness of the two kinds of ductile materials meets the requirements of the base material layer and the reinforcing layer (such as carbon fiber plate, ABS plate, etc.), the above method can be used for processing.

[0066] Optionally, based on the one-stroke printing path, a strengthening layer of the to-be-prepared plate is prepared by using an additive or subtractive processing method. The additive method is generally to use a robot 3D printing process to realize the preparation of the variable-density strengthening layer, and the subtractive method is generally to use a CNC milling process to realize the preparation of the variable-density strengthening layer.

[0067] Step S13: obtaining a base material layer of the to-be-prepared plate, and connecting the strengthening layer and the base material layer into a composite plate;

[0068] Step S14: applying end constraints and loads to the composite plate to obtain the to-be-prepared plate.

[0069] It can be understood that the base material layer of the to-be-prepared plate is obtained, and the size thereof is matched with the size of the strengthening layer, so as to be processed subsequently.

[0070] Optionally, the strengthening layer and the base material layer are connected by a high-strength connecting agent until an integral composite plate is formed, and then end constraints and loads are applied to the composite plate, such as fixing the two ends of the composite plate by using a support, placing a heavy object on the top of the composite plate, etc., so that the composite plate is deformed to obtain the to-be-prepared plate satisfying the target shape curve.

[0071] In one technical solution provided in the embodiment, an axial bending stiffness distribution corresponding to the target shape curve is obtained, a one-stroke printing path with variable density is generated according to the axial bending stiffness distribution, further, a strengthening layer is prepared according to the one-stroke printing path, then the strengthening layer and the base material layer are connected into a composite plate, and end constraints and loads are applied to the composite plate to obtain the to-be-prepared plate. Compared with the hot bending processing technology, the present solution directly uses the strengthening layer to realize good bending performance of the plate, without the need for pre-customizing a mold, thereby eliminating high mold opening costs and significantly reducing input costs. Moreover, unlike the hot bending processing technology which needs a large number of processing links such as wet softening, aging, storage forming and the like, the present solution directly uses the end constraints and loads to realize bending and shape finding, thereby simplifying the links of plate preparation, shortening the overall preparation time of the plate, and effectively improving the production efficiency.

[0072] Further, referring to Figure 2 , a second embodiment of the plate preparation method of the present application is proposed. Based on the above Figure 1 embodiment, the step of obtaining the axial bending stiffness distribution corresponding to the target shape curve of the to-be-prepared plate comprises:

[0073] Step S21: obtaining a target shape curve of a to-be-prepared plate, and end constraints and loads required to reach the target shape curve;

[0074] It can be understood that the workflow of the scheme adopts a reverse process, and after the target shape curve is obtained, the axial bending stiffness distribution of the variable density one-stroke printing path is inversely deduced through the graphical statics algorithm.

[0075] Optionally, a target shape curve of a to-be-prepared plate is obtained, and a force required to reach the target shape curve is obtained, including end constraints and loads. The end constraints can be understood as forces applied to both ends of the plate, and the loads can be understood as the gravity of the plate itself and the force applied to the plate.

[0076] Step S22: The target shape curve is segmented to obtain a plurality of nodes, and the complementary angles between adjacent nodes, the distances between adjacent nodes, and the distances between interval nodes are determined.

[0077] Optionally, after the segmentation, the target shape curve is converted into a plurality of multi-segment lines, and the connection points between the multi-segment lines are defined as nodes. Further, the complementary angles between adjacent nodes, the distances between adjacent nodes, and the distances between interval nodes are determined, as shown in Figure 3 , wherein α i is the complementary angle formed by the two discrete line segments of adjacent nodes i, i.e., the complementary angle between adjacent nodes, l i-1 is the length of the line segment between the i node and the i-1 node, i.e., the distance between two adjacent nodes, l i is the length of the line segment between the i node and the i+1 node, and l i-1,i+1 is the length of the line segment between the i-1 node and the i+1 node, i.e., the distance between interval nodes.

[0078] Step S23: The end constraints and the loads are converted into shearing forces acting on the plurality of nodes through the graphical statics algorithm.

[0079] Optionally, the target shape curve is subjected to force graphing through the graphical statics algorithm. In this process, it can be considered that any mechanical force directly acts on the nodes. Therefore, all the forces on the target shape curve are decomposed and converted into shearing forces on the plurality of nodes based on the plurality of nodes, as shown in Figure 3 , wherein Si,i-1 and Si,i+1 are shearing forces applied to the node i.

[0080] Step S24: The shearing forces on the plurality of nodes, the complementary angles between adjacent nodes, the distances between adjacent nodes, and the distances between interval nodes are substituted into the graphical statics bending member internal force mathematical relationship to obtain the axial bending stiffness distribution.

[0081] Optionally, the graphical statics bending member internal force mathematical relationship is

[0082]

[0083] Therefore, the shear force S i,i-1 and S i,i+1 , the complementary angle a i between adjacent nodes, the distance l i-1 between adjacent nodes, and the distance l i-1,ii+1 between interval nodes are substituted into the graphical statics bending member internal force mathematical relationship formula, so that the bending stiffness (EI) at the node i can be obtained. i Finally, the bending stiffness of all nodes is collected to obtain the axial bending stiffness distribution.

[0084] In one technical solution provided in the embodiment, the complementary angle between adjacent nodes, the distance between adjacent nodes, and the distance between interval nodes are determined based on the target shape curve, the end constraint and the load are converted into shear forces acting on a plurality of nodes through a graphical statics algorithm, and finally the above parameters are substituted into the graphical statics bending member internal force mathematical relationship formula to obtain the axial bending stiffness distribution. By adopting the reverse process, the axial bending stiffness distribution corresponding to the target shape curve can be accurately analyzed through the graphical statics bending member internal force mathematical relationship formula, and the solution process is more convenient and intuitive compared with the intercept method and the section method.

[0085] Further, referring to Figure 4 , a third embodiment of the plate preparation method is proposed. Based on the above Figure 2 , the step of generating a variable-density one-stroke printing path according to the axial bending stiffness distribution includes:

[0086] Step S31: Obtain the elastic modulus of the reinforcing layer material of the to-be-prepared plate, and determine the section moment of inertia distribution corresponding to the axial bending stiffness distribution by combining the mathematical relationship between the axial bending stiffness distribution and the section moment of inertia.

[0087] It can be understood that the mathematical relationship between the axial bending stiffness and the section moment of inertia is

[0088]

[0089] wherein EI is the axial stiffness bending distribution, E i is the elastic modulus of the sub-section unit, b i is the width of the sub-section unit, h i is the height of the sub-section unit, y0 is the position of the overall section neutral axis, and y i is the position of the neutral axis of the sub-section unit. Further, it is defined that is the section moment of inertia.

[0090] It can be seen from the above formula that the axial bending stiffness distribution is related to the size of the sub-section (including the width of the sub-section and the height of the sub-section) and the elastic modulus. The present scheme controls the elastic modulus to be constant, that is, the corresponding fixed elastic modulus is determined according to the type of the material used for the prepared plate reinforcing layer, and then the fixed elastic model is substituted into the mathematical relationship between the axial bending stiffness distribution and the sectional moment of inertia to obtain the sectional moment of inertia distribution.

[0091] Step S32: determining the cross-sectional size of the sectional moment of inertia distribution based on the sampling method, and generating a variable-density one-stroke printing path according to the cross-sectional size.

[0092] Optionally, the cross-sectional size of the sectional moment of inertia distribution, specifically the width and height of the sub-section, is determined by an equidistant equal division sampling method, a fractal sampling method, a random sampling method based on a Thiessen polygon, and the height and width of the one-stroke printing path are determined according to the width and height of the sub-section to achieve the effect of variable density. Referring to Figure 5 , which are one-stroke printing paths generated by an equidistant equal division sampling method, a fractal sampling method, and a random sampling method based on a Thiessen polygon, respectively.

[0093] In one technical scheme provided in the embodiment, the elastic modulus is controlled to be constant, the sectional moment of inertia distribution is determined according to the mathematical relationship between the axial bending stiffness distribution and the sectional moment of inertia, then the cross-sectional size of the sectional moment of inertia distribution is determined based on the sampling method, and a variable-density one-stroke printing path is generated according to the cross-sectional size. In this way, the bending stiffness distribution is converted into specific size parameters by taking the sectional moment of inertia as an intermediate quantity, which facilitates subsequent preparation according to the size parameters.

[0094] Further, referring to Figure 6 , a fourth embodiment of the plate preparation method of the present application is proposed. Based on the above Figure 4 , the step of determining the cross-sectional size of the sectional moment of inertia distribution based on the sampling method and generating a variable-density one-stroke printing path according to the cross-sectional size includes:

[0095] Step S41: determining a plurality of discrete points according to the sectional moment of inertia distribution, and connecting adjacent discrete points into a triangle, and drawing a perpendicular bisector of each side of the triangle;

[0096] Step S42: determining the positions of a plurality of polygons based on the intersection points of the perpendicular bisectors;

[0097] Step S43: determining the size of the polygons according to the sectional moment of inertia distribution and the positions of the polygons, and generating a variable-density one-stroke printing path according to the positions of the polygons and the size of the polygons.

[0098] It can be understood that the random sampling method based on the Thiessen polygon is originally a method for calculating the average rainfall according to the rainfall of the meteorological station with discrete distribution, that is, connecting all adjacent meteorological stations into a triangle, and making the vertical bisector of each side of the triangle, so that a plurality of vertical bisectors around each meteorological station enclose a polygon.

[0099] Optionally, the scheme generates a one-stroke printing path by using the random sampling method based on the Thiessen polygon, determines a plurality of discrete points according to the sectional moment of inertia distribution, connects adjacent discrete points into a triangle, makes a vertical bisector of each side of the triangle, then determines the positions of a plurality of polygons based on the intersection points of the vertical bisectors, further determines the sizes of the polygons according to the sectional moment of inertia distribution and the positions of the polygons, and generates a variable-density one-stroke printing path according to the positions of the polygons and the sizes of the polygons.

[0100] Further, the reinforcing layer is prepared according to the one-stroke printing path, and the reinforcing layer and the substrate layer are connected, constrained and loaded to obtain a to-be-prepared board. Referring to Figure 7 , the board structure level diagram prepared according to the one-stroke printing path generated by using the random sampling method based on the Thiessen polygon, wherein 1 is a reinforcing layer, 2 is a high-strength connecting agent, and 3 is a substrate layer. Referring to Figure 8 , a one-stroke printing path is generated according to the equidistant equal division sampling method, the fractal sampling method and the random sampling method based on the Thiessen polygon respectively, and the fitting effects of the three different patterns are shown in the figure.

[0101] In one technical solution provided in the embodiment, the random sampling method based on the Thiessen polygon is used to determine the positions and sizes of a plurality of polygons, and finally a variable-density one-stroke printing path is generated according to the positions and sizes of the plurality of polygons. Compared with the equidistant equal division sampling method and the fractal sampling method, the fitting effect of the scheme is the best, and the curvature characteristics of the target morphological curve are also the most consistent.

[0102] Further, referring to Figure 9 , the fifth embodiment of the board preparation method of the present application is proposed. Based on the above Figure 6 embodiment shown, after the step of determining the sizes of the polygons according to the sectional moment of inertia distribution and the positions of the polygons, and generating a variable-density one-stroke printing path according to the positions of the polygons and the sizes of the polygons, the step includes:

[0103] Step S51: determining whether the density parameter corresponding to the one-stroke printing path meets the preparation parameter of the processing technology;

[0104] Step S52: If not, adjust the target profile curve, execute the steps of obtaining the target profile curve of the plate to be prepared and the end constraints and loads required to achieve the target profile curve;

[0105] Step S53: If yes, execute the step of preparing the reinforcing layer of the plate to be prepared according to the one-stroke printing path.

[0106] It can be understood that before preparing the reinforcing layer according to the one-stroke printing path, the limitations of the manufacturing process in the preparation process need to be considered. For example, when using a robotic 3D printing process, printing cannot be performed on a plate that is too thin or too thick. Therefore, it is necessary to determine whether the density parameters corresponding to the one-stroke printing path meet the preparation parameters of the manufacturing process, such as whether the span of the reinforcing layer to be printed is within a predetermined threshold range.

[0107] Further, if not, it means that the initially set target profile curve is unreasonable, so it needs to be adjusted accordingly and then re-execute the steps of obtaining the target profile curve of the plate to be prepared and the end constraints and loads required to achieve the target profile curve; otherwise, if yes, it means that the one-stroke printing path and the target profile curve are executable, so the preparation process can be entered.

[0108] The step of preparing the reinforcing layer of the plate to be prepared according to the one-stroke printing path includes:

[0109] Step S54: Referring to the one-stroke printing path, determine the printing process parameters of the 3D printing device;

[0110] Step S55: According to the printing process parameters, control the 3D printing device to print the reinforcing layer of the plate to be prepared.

[0111] It can be understood that according to the size of the polygon and the position of the polygon in the one-stroke printing path, the printing process parameters of the 3D printing device are determined, including but not limited to printing speed, discharge speed, layer height, etc., to ensure that the axial bending stiffness of the printed reinforcing layer is consistent with the size of the calculated cross-sectional moment of inertia (at least within a reasonable floating interval). Further, according to the printing process parameters, the 3D printing device is controlled to print the reinforcing layer of the plate to be prepared.

[0112] In a technical solution provided in the embodiment, before entering the preparation process, the manufacturability is analyzed according to the preparation parameters of the processing technology, and after it is determined that the preparation parameters of the processing technology are met, the printing process parameters of the 3D printing device are further determined to accurately prepare the reinforcing layer. By such setting, the overall efficiency can be improved, and the situation that the printing cannot continue in the preparation process can be avoided, and compared with the CNC milling process, the present solution can effectively avoid waste of raw materials and further reduce the preparation cost.

[0113] Further, referring to Figure 10 , a sixth embodiment of the plate preparation method is provided. Based on the above Figure 1 indicated embodiments, the step of applying end constraints and loads to the composite plate to obtain the to-be-prepared plate comprises:

[0114] Step S61: obtaining end constraint conditions and load conditions required to reach the target shape curve;

[0115] Step S62: based on the end constraint conditions, the two ends of the composite plate are constrained, and based on the load conditions, loads are applied to the composite plate to obtain the to-be-prepared plate.

[0116] After the step of applying end constraints and loads to the composite plate to obtain the to-be-prepared plate, comprising:

[0117] Step S63: calculating the matching rate of the fitting shape curve of the to-be-prepared plate and the target shape curve;

[0118] Step S64: if the matching rate does not reach the preset passing rate, the end constraint conditions and the load conditions are adjusted, and the step of applying end constraints and loads to the composite plate to obtain the to-be-prepared plate is executed.

[0119] It can be understood that the composite plate connected by the reinforcing layer and the substrate layer is in a flat shape, and in order to reach the target shape curve, it needs to be deformed. Optionally, the constraint conditions and the load conditions are set according to the target shape curve, on the one hand, the two ends of the composite plate are fixed based on the constraint conditions, and on the other hand, the fixed composite plate is subjected to pressure based on the load conditions, so as to finally generate the to-be-prepared plate.

[0120] It can be understood that errors may occur in the deformation process, or the prepared plate shape is different from the target shape curve due to inappropriate storage conditions (such as humidity, temperature, etc.), so it is necessary to calculate the matching rate of the prepared plate fitting shape curve and the target shape curve, if the matching rate does not reach the preset passing rate, it means that the prepared plate has been deformed, so it is necessary to determine the constraint condition and the load condition again, and adjust the prepared plate under the new condition.

[0121] In one of the technical solutions provided in the embodiment, the constraint condition and the load condition are obtained, and the composite plate is fixed and pressed under the above conditions, and the matching analysis of the fitting shape curve and the target shape curve of the prepared plate is performed to timely adjust the shape. Unlike irreversible hot bending processing technology, this scheme can restore the original state of the composite plate by releasing the support constraint, and then perform multiple adjustments based on new constraint conditions and load conditions until a better fitting effect is achieved. With such a setting, subtle deformation errors can be corrected in time, and the flexibility is higher.

[0122] Reference Figure 11 , Figure 11 The 3D printing device structure schematic diagram of the hardware running environment involved in the embodiment of the application is shown in the figure.

[0123] As Figure 11 shown, the 3D printing device can include a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 can include a display screen (Display), an input unit such as a keyboard (Keyboard), and an optional user interface 1003 can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 can be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (NVM), such as a magnetic disk memory. The memory 1005 can also be an independent storage device from the aforementioned processor 1001.

[0124] Those skilled in the art can understand that Figure 11 the structure shown in the figure does not constitute a limitation on the 3D printing device, and can include more or fewer components than the figure, or combine certain components, or different component arrangements.

[0125] As Figure 11 shown, the memory 1005 as a storage medium can include an operating system, a data storage module, a network communication module, a user interface module and a plate preparation program.

[0126] In Figure 11 the 3D printing device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the 3D printing device of the present application can be arranged in the 3D printing device, and the plate preparation program stored in the memory 1005 is called by the processor 1001, and the plate preparation method provided by the embodiment of the present application is executed.

[0127] The embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium has a computer program stored thereon, and the computer program is run by a processor to realize the steps in any embodiment of the above plate preparation method.

[0128] Since the embodiments of the computer readable storage medium part correspond to the embodiments of the method part, the embodiments of the computer readable storage medium part are described in the description of the embodiments of the method part, and are not described here.

[0129] It should be noted that in this paper, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or system. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or system including the element.

[0130] The above-mentioned embodiment number of the present application is only for description, not representing the advantages and disadvantages of the embodiments.

[0131] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server or network device) execute the method described in each embodiment of the present application.

[0132] The above merely provides the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent flowchart transformation, or direct or indirect application in other related technical fields, which is made based on the contents of the present application specification and drawings, shall be included in the patent protection scope of the present application.

Claims

1. A method of preparing a board, characterized in that, The plate preparation method comprises the following steps: obtaining a target shape curve of a to-be-prepared plate and end constraints and loads required to reach the target shape curve; segmenting the target shape curve to obtain a plurality of nodes and determining complementary angles between adjacent nodes, distances between adjacent nodes and distances between interval nodes; converting the end constraints and the loads into shearing forces acting on the plurality of nodes through a graphical statics algorithm; substituting the shearing forces on the plurality of nodes, the complementary angles between adjacent nodes, the distances between adjacent nodes and the distances between interval nodes into a mathematical relationship of internal forces in a graphical statics bending member to obtain axial bending stiffness distribution and obtain an elastic modulus of a reinforcing layer material of the to-be-prepared plate, determine cross-sectional moment of inertia distribution corresponding to the axial bending stiffness distribution in combination with a mathematical relationship of the axial bending stiffness distribution and the cross-sectional moment of inertia; determining cross-sectional dimensions of the cross-sectional moment of inertia distribution based on a sampling method and generating a one-stroke printing path with variable density according to the cross-sectional dimensions; preparing the reinforcing layer of the to-be-prepared plate according to the one-stroke printing path; obtaining a base material layer of the to-be-prepared plate, and connecting the reinforcing layer and the base material layer into a composite plate; applying end constraints and loads to the composite plate to obtain the to-be-prepared plate.

2. The method of claim 1, wherein The step of determining the cross-sectional dimensions of the cross-sectional moment of inertia distribution based on the sampling method and generating the one-stroke printing path with variable density according to the cross-sectional dimensions comprises: determining a plurality of discrete points according to the cross-sectional moment of inertia distribution, and connecting adjacent discrete points into triangles, and drawing perpendicular bisectors of sides of the triangles; determining positions of a plurality of polygons based on intersection points of the perpendicular bisectors; determining cross-sectional dimensions of the polygons according to the cross-sectional moment of inertia distribution, the elastic modulus and the positions of the polygons, and generating the one-stroke printing path with variable density according to the cross-sectional dimensions.

3. The method of claim 2, wherein the step of applying the adhesive is performed after the step of applying the second layer of material. After the step of determining the dimensions of the polygons according to the cross-sectional moment of inertia distribution and the positions of the polygons, and generating the one-stroke printing path with variable density according to the positions of the polygons and the dimensions of the polygons, the method comprises the following steps: determining whether a density parameter corresponding to the one-stroke printing path meets preparation parameters of a processing technology; if not, adjusting the target shape curve, and executing the step of obtaining the target shape curve of the to-be-prepared plate and the end constraints and loads required to reach the target shape curve; if yes, executing the step of preparing the reinforcing layer of the to-be-prepared plate according to the one-stroke printing path.

4. The method of claim 3, wherein the step of applying the adhesive is performed after the step of applying the second coating. The step of preparing the reinforcing layer of the to-be-prepared plate according to the one-stroke printing path comprises the following steps: determining printing process parameters of a 3D printing device with reference to the one-stroke printing path; controlling the 3D printing device to print the reinforcing layer of the to-be-prepared plate according to the printing process parameters.

5. The method of claim 1, wherein The step of applying end constraints and loads to the composite plate to obtain the to-be-prepared plate comprises the following steps: obtaining end constraint conditions and load conditions required to reach the target shape curve; The two ends of the composite plate are constrained based on the end constraint condition, and the composite plate is loaded based on the load condition, to obtain the to-be-prepared plate.

6. The method of claim 5, wherein the step of applying the adhesive is performed after the step of applying the second coating. After the step of obtaining the to-be-prepared plate by constraining the two ends of the composite plate based on the end constraint condition and loading the composite plate based on the load condition, the method further comprises: calculating a matching rate of the fitting profile curve of the to-be-prepared plate and the target profile curve; if the matching rate does not reach a preset passing rate, adjusting the end constraint condition and the load condition, and executing the step of obtaining the to-be-prepared plate by constraining the two ends of the composite plate based on the end constraint condition and loading the composite plate based on the load condition.

7. A 3D printing device, characterized by The 3D printing device comprises a memory, a processor, and a plate preparation program stored on the memory and executable on the processor, and the plate preparation program is configured to implement the steps of the plate preparation method according to any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a plate preparation program, and the plate preparation program is executed by the processor to implement the steps of the plate preparation method according to any one of claims 1 to 6.

Images