Multi-material 3D printing apparatus and method based on a rotating structure

Abstract

The application discloses a kind of multi-material 3D printing device and method based on rotating structure, by utilizing rotating cylindrical base as printing tray, with rotating cylindrical base axis as center line, by extending multiple printing nozzle unit, provide multiple nozzle to carry out the collaborative printing function of multiple filaments, and the movement of each printing nozzle unit does not interfere with each other, to meet the multi-material 3D printing demand based on FDM process, and have the batch printing advantage of high efficiency, the equipment structure of the application makes full use of the forming space of rotating cylindrical base, mechanical design structure is compact, space utilization is high, printing efficiency is high, equipment structure is stable and reliable, can reduce the maintenance threshold of multi-material equipment, can effectively meet the desktop miniaturization development requirement of multi-material 3D printing equipment.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing technology and specifically relates to a multi-material 3D printing device and method based on a rotating structure. Background Technology

[0002] 3D printing technology, also known as additive manufacturing, is a technology that uses the gradual accumulation of material to create solid parts. Compared to traditional material removal and machining techniques, it is a "bottom-up" manufacturing method. Based on its unique advantages, 3D printing technology has transformed the product design and manufacturing process, and is considered an "accelerator" of technological innovation in many fields, a key foundational technology supporting the innovative development of the manufacturing industry, and further changes product production models, driving customized, personalized, and distributed manufacturing. There are various types of 3D printing processes, which can be broadly classified into seven types based on their principles: material extrusion, powder bed fusion, binder jetting, material jetting, stereolithography, layer stacking, and directional energy deposition.

[0003] Currently, as a typical representative of material extrusion technology, FDM (Fused Deposition Modelling) technology uses thermoplastic polymer (commonly known as plastic) filaments as printing consumables, such as PLA (Polylactic Acid) and ABS (Arcylonitrile Butadiene Styrene). By controlling the filaments as they enter the print head and controlling the internal heating temperature, the filaments melt and change inside the print head, transforming the printing material from a solid state to a molten state. The molten material is then extruded through the nozzle structure at the end of the print head. The extruded molten material is cooled by a fan at the end of the print head, completing the transformation from a molten state to a solid state. Simultaneously, the above process, combined with the motion system of the FDM equipment, guides the extruded molten material along a pre-planned printing path, processing it from point to line, from line to surface, and then from surface to volume, ultimately achieving the molding and printing of 3D digital models. Due to its relatively simple process principle, low hardware construction cost, and ease of operation and maintenance, FDM technology is well-suited for home desktop 3D printing applications. This has promoted the application and promotion of FDM technology in the consumer goods sector, particularly in the automotive manufacturing, design, medical, education, and cultural industries. A key feature of mainstream FDM equipment is its support for single-nozzle monochrome 3D printing, resulting in parts with high forming accuracy and excellent print quality.

[0004] Multi-material 3D printing based on FDM technology is a development trend in FDM technology. Currently, various technical methods have been proposed to achieve multi-material FDM printing. The first category is multi-material 3D printing equipment and methods based on nozzle selection. A typical feature of this type of equipment is that the printing nozzles can be freely replaced, similar to the automatic tool changer system of a CNC milling machine. For example, invention patent 202410477504.6 discloses a multi-nozzle switching 3D printer, a nozzle gripping, docking, and separation method, and a control method. A typical feature of this invention is that it uses a replaceable printing nozzle method to achieve color splicing printing of the FDM equipment. Each print head is only responsible for printing one type of filament, and the print head has a complete filament feeding mechanism and a hot end structure, while also being equipped with a corresponding male connector structure. A female connector structure is configured at the end of the motion structure in the Cartesian coordinates (XYZ) of the equipment. By selecting male connector printing nozzles with different printing filaments on the female connector structure at the end of the printing equipment, multi-color 3D printing is achieved. However, the 3D printing method based on nozzle selection has low printing efficiency. This is because only one nozzle is loaded onto the end of the motion unit at a time, and the internal heating function of the print head is only activated when it is in working state. When the print head switches from non-working state to working state, it takes a certain amount of time to complete the automatic replacement of the print head and also takes a certain amount of time to heat the print head to the specified heating temperature before the subsequent printing task can be completed.

[0005] The second category is multi-material 3D printing structures and methods based on fixed multi-nozzle printing configurations. A typical characteristic of this type of FDM equipment is that the printing nozzles, or improved nozzles with multi-nozzle structures, are fixed together and move with the end of the moving structure. The most common type is an FDM printer with two sets of nozzles: one set for printing the model filament material, and the other set for printing the support filament. The drawback of this structure is that the fixed nozzles limit the printing space of the moving structure, or necessitate increasing the size of the printing equipment to accommodate the fixed movement of the multiple nozzles. Furthermore, the fixed nozzles result in a heavy load on the moving end of the equipment, requiring appropriate acceleration and deceleration settings to ensure print quality. Invention patent 201911418244.0 discloses a replaceable nozzle material 3D printing structure. By designing a replaceable nozzle to support multi-material printing, it reduces the load on the printing nozzles of the mobile terminal while improving the ability to print multiple materials. This presents new requirements for the design of multi-material nozzle structures to ensure smooth material and nozzle replacement.

[0006] The third category is multi-material 3D printing structures and methods where multiple nozzles participate in the printing process. A typical characteristic of this type of FDM equipment is that the movement of each nozzle is independent, requiring careful consideration of interference issues between the various nozzle movements. For example, invention patent 202110649495.0 discloses a cylindrical coordinate multi-nozzle FDM 3D printer and its printing method. This invention uses a cylindrical coordinate (r-θ-z) motion structure to replace the conventional Cartesian coordinate (xyz) motion structure to construct a 3D printing device with multiple nozzles. The vertical motion structure is responsible for the Z-axis movement, and each radial motion unit is responsible for the R-axis movement of the corresponding printing nozzle. Multiple radial motion units are uniformly and fixedly mounted on the vertical motion structure. Finally, a ring-shaped printing platform unit at the bottom of the vertical motion structure is responsible for the rotational θ-axis movement. This printing method controls the rotation angle of the ring-shaped printing platform to rotate the printing work area to the corresponding nozzle work area, thereby achieving collaborative printing of the multi-nozzle structure. However, this type of cylindrical coordinate-based multi-nozzle printing method reduces the efficiency of multi-material FDM printing. This is because after completing the printing task of each material nozzle, the ring printing platform needs to be rotated to complete the printing task of the next material nozzle. The utilization rate of the ring printing platform is not high, and the equipment structure is relatively complex and large, which is not conducive to the desktop miniaturization development of multi-material FDM equipment.

[0007] In summary, the multi-material FDM printing technologies disclosed above either have overly complex equipment structures, which place high demands on the structural design of the equipment, or have complex implementation methods, resulting in high maintenance thresholds. These factors hinder the application and promotion of multi-material FDM printing technology in the miniaturized desktop market. Summary of the Invention

[0008] To address the aforementioned problems, this invention proposes a multi-material 3D printing device and method based on a rotating structure.

[0009] The present invention relates to a multi-material 3D printing device based on a rotating structure, comprising: a rotating cylindrical base, one end of which is connected to a base power device, the rotating cylindrical base being horizontally mounted above a base via a fixing block located at one end of the base; a printing nozzle unit, comprising multiple printing nozzle units distributed radially along the rotating cylindrical base, the printing nozzle units being located at the other end of the base; and nozzles mounted on the printing nozzle units, the multiple nozzles all facing the rotating cylindrical base, and the nozzles being capable of moving axially and radially along the rotating cylindrical base.

[0010] The print head unit includes print head unit one, print head unit two, and print head unit three. Print head unit two is vertically arranged, and print head unit one and print head unit three are respectively installed at an angle on both sides of print head unit two.

[0011] The second nozzle unit includes a second Z-axis and a second X-axis that are perpendicular to each other. The second Z-axis is vertically arranged and its bottom is fixedly connected to the base. The second X-axis is arranged along the axial direction of the rotating cylindrical base and a nozzle is installed on the second X-axis, which is located above the rotating cylindrical base.

[0012] A Z-axis power unit is installed on the second Z-axis. The second Z-axis power unit is connected to one end of the second X-axis. The second Z-axis power unit drives the second X-axis to move up and down along the second Z-axis. An X-axis power unit is installed on the second X-axis. The second X-axis power unit is connected to the nozzle on the second X-axis. The second X-axis power unit can drive the nozzle to move left and right along the second X-axis.

[0013] The nozzle unit one is equipped with a corresponding Z-axis power device and an X-axis power device, and the nozzle unit three is equipped with a Z-axis power device and an X-axis power device.

[0014] The base power unit, Z-axis power unit one, X-axis power unit one, Z-axis power unit two, X-axis power unit two, Z-axis power unit three, and X-axis power unit three are one of the following structures: motor, gear set, synchronous belt, and lead screw.

[0015] The printing method of the multi-material 3D printing device based on a rotating structure of the present invention includes the following steps:

[0016] S1. Perform slicing and path planning on the three-dimensional digital model composed of multiple colors;

[0017] S2. Printing process of a 3D printing device based on a rotating cylindrical base.

[0018] S1 includes the following steps:

[0019] S11. The color 3D digital model is converted to obtain multiple sub-mesh models representing different colors. These sub-mesh models are combined to form the overall color mesh model.

[0020] S12. Perform affine transformation on the obtained overall colored mesh model;

[0021] S13. Slice and perform layer-by-layer path planning on the overall color mesh model after affine transformation to obtain the layer-by-layer path planning data corresponding to the overall color mesh model after affine transformation. This data is used to drive the nozzle unit of the corresponding printing material.

[0022] The slicing process includes:

[0023] S131. The classic STL planar slicing algorithm is directly used to slice the overall color mesh model after affine transformation to obtain the sliced ​​contour data.

[0024] S132. Perform path planning on the sliced ​​contour data;

[0025] S133. After processing by S131 and S132, we obtain the hierarchical planning path data corresponding to each affine transformation sub-mesh model.

[0026] S2 includes the following steps:

[0027] S21. Establish a one-to-one correspondence between each sub-mesh model in the color 3D model and the nozzle unit of a specific printing material, as well as the absolute positional relationship of each nozzle unit in its workspace;

[0028] S22. Process the path information of the current layer slice layer k of each sub-mesh model according to the layered path data after slicing each sub-mesh model. k starts from 1, that is, control each printing nozzle unit to print according to the path information until the slice filling path of all sub-mesh models is printed.

[0029] S23. Following step S22, continue processing the k+1 layer slice path data of each sub-mesh model until all slice paths have been printed.

[0030] The beneficial effects of this invention are that by using a rotating cylindrical base as a printing tray and the axis of the rotating cylindrical base as the center line, and by expanding multiple printing nozzle units, it provides a multi-nozzle, multi-filament collaborative printing function, and the movement of each printing nozzle unit does not interfere with each other, thereby meeting the multi-material 3D printing requirements based on FDM technology, and has the advantage of high-efficiency batch printing. The equipment structure of this invention makes full use of the forming space of the rotating cylindrical base, with a compact mechanical design, high space utilization, high printing efficiency, and stable and reliable equipment structure. It can reduce the maintenance threshold of multi-material equipment and effectively meet the desktop miniaturization development requirements of multi-material 3D printing equipment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0032] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0033] Figure 3 This is a side view of the rotating cylindrical base and the mesh model before affine transformation according to the present invention.

[0034] Figure 4 This is a side view of the rotating cylindrical base and the mesh model after affine transformation according to the present invention.

[0035] Figure 5 This is a flowchart of the printing method of the present invention.

[0036] Figure label:

[0037] 1. Rotating cylindrical base; 2. Base; 3. Fixing block; 4. Z-axis II; 5. X-axis II; 6. Nozzle; 7. Z-axis I; 8. X-axis I; 9. Z-axis III; 10. X-axis III Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1-2 As shown, the multi-material 3D printing device based on a rotating structure of the present invention includes: a rotating cylindrical base 1, a printing nozzle unit, and a nozzle 6. One end of the rotating cylindrical base 1 is connected to a base power unit. The rotating cylindrical base 1 and the base power unit are horizontally mounted above a base 2 via a fixing block 3, which is located at one end of the base 2. The base power unit can drive the rotating cylindrical base 1 to rotate in the horizontal direction. There are multiple printing nozzle units, which are radially distributed along the rotating cylindrical base 1. The printing nozzle units are located at the other end of the base 2. The nozzles 6 are mounted on the printing nozzle units, and all the nozzles 6 face the rotating cylindrical base 1. The nozzles 6 can move axially and radially along the rotating cylindrical base 1.

[0040] Specifically, the printhead unit includes printhead unit one, printhead unit two, and printhead unit three; however, the number of printhead units is not limited to three. Printhead unit two is vertically arranged, while printhead unit one and printhead unit three are respectively installed at an angle on both sides of printhead unit two. The included angle between printhead unit one and printhead unit three and printhead unit two can be set to an appropriate angle as needed, generally an acute angle. Printhead unit two includes a Z-axis two 4 and an X-axis two 5 that are perpendicular to each other. Z-axis two 4 is vertically arranged, and its bottom is fixedly connected to the base 2. X-axis two 5 is arranged along the axial direction of the rotating cylindrical base 1 on Z-axis two 4, and a printhead 6 is mounted on X-axis two 5, located above the rotating cylindrical base 1.

[0041] A Z-axis power unit is installed on Z-axis 24. The Z-axis power unit is connected to one end of X-axis 25. The Z-axis power unit drives X-axis 25 to move up and down along Z-axis 24. An X-axis power unit is installed on X-axis 25. The X-axis power unit is connected to the nozzle 6 on X-axis 25. The X-axis power unit can drive the nozzle 6 to move left and right along X-axis 25.

[0042] Nozzle unit one includes Z-axis 7 and X-axis 8 which are perpendicular to each other, and nozzle unit three includes Z-axis 9 and X-axis 10 which are perpendicular to each other. Nozzle unit one is equipped with corresponding Z-axis power device and X-axis power device, and nozzle unit three is equipped with Z-axis power device and X-axis power device.

[0043] Z-axis 7 is tilted and set on one side of Z-axis 4. Z-axis power unit is set on Z-axis 7 and connected to one end of X-axis 7. Z-axis power unit drives X-axis 8 to move up and down along Z-axis 7. X-axis power unit is set on X-axis 8 and connected to nozzle 6 on X-axis 8. X-axis power unit can drive nozzle 6 to move left and right along X-axis 8.

[0044] Z-axis 3 9 is inclinedly set on the other side of Z-axis 2 4. Z-axis 3 power unit is set on Z-axis 3 9. Z-axis 3 power unit is connected to one end of X-axis 3 10. Z-axis 3 power unit drives X-axis 3 10 to move up and down along Z-axis 3 9. X-axis 3 power unit is set on X-axis 3 10. X-axis 3 power unit is connected to nozzle 6 on X-axis 3 10. X-axis 3 power unit can drive nozzle 6 to move left and right along X-axis 3 10.

[0045] The rotating cylindrical base 1 can be considered as the Y-axis, and the base power unit can be regarded as a Y-axis motor, which is responsible for the rotation of the rotating cylindrical base. Multiple printhead units are radially distributed perpendicular to the center line of the rotating cylindrical base 1. The printhead 6 in each printhead unit is responsible for heating and extruding the filament of a single material. Different printhead units are independent of each other in their respective X-axis and Z-axis motion dimensions, thus ensuring the coordination of multiple printheads while avoiding mutual interference between the movements of individual printheads.

[0046] The base power unit 1, Z-axis power unit 1, X-axis power unit 1, Z-axis power unit 2, X-axis power unit 2, Z-axis power unit 3, and X-axis power unit 3 are all based on a motor, gear set, synchronous belt, or lead screw structure. The base power unit and the rotating cylindrical base 1 can be driven by a motor, a gear set, or a synchronous belt. The Z-axis uses lead screw transmission, and the X-axis uses a synchronous belt.

[0047] The printing method of the multi-material 3D printing device based on a rotating structure of the present invention includes the following steps:

[0048] S1. Perform slicing and path planning on the three-dimensional digital model composed of multiple colors;

[0049] S11. The color 3D digital model is transformed to obtain multiple sub-mesh models representing different colors. Each sub-mesh model represents a closed space within the 3D space of the original color 3D digital model, and this space is assigned the color attributes of a specific material corresponding to the original color 3D digital model. In this way, the various sub-mesh models, after being divided, together form the original color 3D digital model in 3D space, and these sub-mesh models constitute the overall color mesh model.

[0050] S12. Perform affine transformation processing on the obtained overall color mesh model; adopt a data processing method based on affine transformation disclosed in invention patent 202410635234.7 to obtain the affine transformed overall color mesh model. Specifically, this includes the following steps: Figures 3-4 As shown:

[0051] S121. Establish a coordinate system. The rotating 3D printing device includes a rotating cylindrical base 1 and a nozzle 6. Based on the acquired geometric information of the rotating 3D printing device, establish a mathematical model: Project the rotating cylindrical base 1 horizontally along its central axis to obtain the XOZ plane, where the Z-axis is vertically upward and the X-axis is horizontally to the right. Take the highest point of the projected circle of the rotating cylindrical base as the origin O, and take the rotation central axis of the rotating cylindrical base as the Y-axis. Correspondingly, the Y-axis is perpendicular to the XOZ plane and points inward, thus conforming to the characteristics of the right-hand coordinate system. This completes the establishment of the three-dimensional coordinate system.

[0052] S122. Obtain and process the model file: Obtain the model file of the 3D model to be printed, perform mesh densification to obtain a 3D mesh model, and perform mapping transformation operations on the vertices of the 3D mesh model to achieve the affine transformation of the 3D model; the mapping transformation operation refers to traversing the model vertex coordinates in the model file and performing mapping transformation operations on each vertex coordinate as follows:

[0053] i. Given a model with vertex P(x, y, z), a center Q of a rotating cylindrical base, and a radius R0 of rotation of the rotating cylindrical base, the distance between point P and the center Q of the rotating cylindrical base is L. i ;

[0054] ii. On the XOZ plane, calculate the angle α between the QP ray and the QZ ray, where α is in radians;

[0055] iii. Calculate the spatial coordinates P'(x', y', z') of point P after mapping according to the following mapping formula.

[0056] P'(x',y',z')=(Li*α,y,Li-R0)

[0057] P' is used as the vertex coordinates of the affine transformation of the 3D model.

[0058] To improve the surface detail accuracy of the model, ensure accurate geometry, avoid printing defects, and accurately simulate physical properties and effectively generate support structures, the printed 3D model (such as an STL model) needs to undergo mesh densification. This mesh densification process uses classic mesh subdivision algorithms, such as multiple Hermite spatial interpolation subdivision, Loop subdivision, and Catmull-Clark subdivision.

[0059] S13. Slice and perform layer-by-layer path planning on the overall color mesh model after affine transformation to obtain the layered planning path data corresponding to the overall color mesh model after affine transformation. Since each sub-mesh model does not intersect with each other in three-dimensional space, and each represents a mesh model printed with a specific printing material.

[0060] The slicing process iterates through the sub-mesh model of each affine transformation pair, and the specific processing is as follows:

[0061] S131. The classic STL planar slicing algorithm is directly used to slice the overall colored mesh model after affine transformation, such as the face-to-face intersection slicing algorithm, the line-to-face intersection slicing algorithm, and the perpendicular line intersection slicing algorithm, to obtain the sliced ​​contour data.

[0062] S132. Perform path planning on the sliced ​​contour data. Existing classic FDM path filling algorithms, such as Zigzag path filling, Contour-Parallel path filling, and Spirals path filling algorithms, can be directly adopted.

[0063] S133. After processing by S131 and S132, the hierarchical planning path data corresponding to each affine transformation sub-mesh model is obtained. This data is used to drive the nozzle unit module of the corresponding printing material.

[0064] S2. Printing process of a 3D printing device based on a rotating cylindrical base.

[0065] S21. Establish a one-to-one correspondence between each sub-mesh model in the color 3D model and the nozzle unit of the specific printing material, as well as the absolute positional relationship of each nozzle unit in the workspace. That is, for a sub-model of a specific color, the printing nozzle i-structure unit module of the corresponding material is used to complete the printing.

[0066] S22. Based on the layered path data obtained after slicing each sub-mesh model, process the path information of the current layer slice k of each sub-mesh model according to the following steps, k starts from 1, that is, control each printing nozzle unit to print according to the path information until all the slice filling paths of the sub-mesh models are printed.

[0067] S221. Calculate the printing height h of the current layer k based on the slice thickness d, using the following formula:

[0068] h = k * d

[0069] Simultaneously, the z-axis motors in each printhead unit module are controlled to rotate, ensuring that each printhead unit is at a height h.

[0070] S222. Traverse the layered path data Path of each sub-mesh model. Assume that the fill path data of the current sub-mesh model at layer k is Pat[k]. If Path[k] is not empty, rotate the rotating cylindrical base to the workspace of the corresponding print head unit i of the current sub-mesh model, and control the Y-axis motor to rotate the rotating base to the absolute angle θ. i The position is determined; then, the affine planar path in Path[k] is used to obtain its corresponding x-axis path component and y-axis path component. The x-axis path component is directly used to drive the X-axis motor in the current print head unit module to control the print head movement corresponding to the printing component; the y-axis path component is directly used to drive the Y-axis rotary motor to control the rotating cylindrical base movement corresponding to the printing component. If Path[k] is empty, it means that there is no printing path data in the k-th layer of the current sub-mesh model. In this case, the rotating cylindrical base does not need to rotate the printing space, and the next sub-mesh model is processed directly.

[0071] S223. After step S222, the fill paths of the Path[k] layer slices of all sub-mesh models have been printed.

[0072] S23. Following step S22, continue processing the k+1 layer slice path data of each sub-mesh model until all slice paths have been printed.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A multi-material 3D printing device based on a rotating structure, characterized in that, The utility model relates to a kind of 3D printing device based on rotating cylindrical base, including: Rotary cylindrical base, one end of the rotary cylindrical base is connected with base power device, rotary cylindrical base is horizontally installed above base by fixed block, and fixed block is arranged at one end of base; Multiple printing nozzle units, multiple printing nozzle units are distributed along the radial direction of rotary cylindrical base, and printing nozzle unit is arranged at the other end of base; The printing nozzle unit includes nozzle unit one, nozzle unit two and nozzle unit three, nozzle unit two is vertically arranged, and nozzle unit one and nozzle unit three are respectively installed on the two sides of nozzle unit two at an angle;The included angle between nozzle unit one and nozzle unit three and nozzle unit two is set as acute angle; Nozzle, nozzle is installed on printing nozzle unit, multiple nozzles are all towards rotary cylindrical base, and nozzle can move along the axial direction and radial direction of rotary cylindrical base.

2. The multi-material 3D printing device based on a rotating structure according to claim 1, wherein, Nozzle unit two includes mutually perpendicular Z axis two and X axis two, Z axis two is vertically arranged, and Z axis two bottom is fixedly connected with base, X axis two is arranged along the axial direction of rotary cylindrical base, X axis two is installed with nozzle, and nozzle is located above rotary cylindrical base.

3. The multi-material 3D printing device based on a rotating structure according to claim 2, wherein, Z axis two is provided with Z axis two power device, Z axis two power device is connected with one end of X axis two, Z axis two power device drives X axis two to move up and down along Z axis two, X axis two is provided with X axis two power device, X axis two power device is connected with nozzle on X axis two, and X axis two power device can drive nozzle to move left and right along X axis two.

4. The multi-material 3D printing device based on a rotating structure according to claim 3, wherein, Z axis one power device and X axis one power device are arranged on nozzle unit one, and Z axis three power device and X axis three power device are arranged on nozzle unit three.

5. The multi-material 3D printing device based on a rotating structure according to claim 4, wherein, Base power device, Z axis one power device, X axis one power device, Z axis two power device, X axis two power device, Z axis three power device and X axis three power device are one of motor, gear set, synchronous belt and screw structure.

6. A printing method of a multi-material 3D printing apparatus based on a rotating structure according to any one of claims 1 to 5, characterized in that, The utility model includes the following steps: S1. slice processing and path planning processing are carried out to three-dimensional digital model composed of multiple colors; S2. printing processing based on 3D printing device of rotating cylindrical base.

7. The multi-material 3D printing device based on a rotating structure according to claim 6, wherein, S1. includes the following steps: S11. color three-dimensional digital model is converted, and multiple sub-grid models representing different colors are obtained, which constitute the whole color grid model; S12. model affine transformation processing is carried out to the obtained whole color grid model; S13. slice and layer-by-layer path planning processing are carried out to the whole color grid model after affine transformation, to obtain the layer-by-layer planning path data corresponding to the whole color grid model after affine transformation, which is used to drive the nozzle unit of corresponding printing material subsequently.

8. The multi-material 3D printing device based on a rotating structure according to claim 7, wherein, The slice processing step includes: S131. directly using classic STL plane slicing algorithm to slice the whole color grid model after affine transformation, to obtain the contour data after slicing; S132. path planning is carried out to the contour data after slicing; S133. after S131 and S132 processing, the layer-by-layer planning path data corresponding to each sub-grid model after affine transformation is obtained.

9. The multi-material 3D printing device based on a rotating structure of claim 6, wherein, S2. includes the following steps: S21. Establishing one-to-one correspondence between each sub-grid model in the color three-dimensional model and the nozzle unit of a specific printing material, and the absolute position relationship corresponding to the working space of each nozzle unit; S22. Processing the path information of the current slice layer k of each sub-grid model according to the obtained slice path data of each sub-grid model, k starts from 1, that is, controlling each printing nozzle unit to print according to the path information until all the slice filling paths of all the sub-grid models are printed; S23. According to step S22, continue to process the slice path data of k+1 layer of each sub-grid model until all the slice paths are printed.

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