CN111873407A - A 3D printing method and 3D printing components and 3D printing platform for the same - Google Patents

Abstract

The invention discloses a 3D printing method, a 3D printing component and a 3D printing platform used for the method, and the 3D printing method comprises: S1, layering a three-dimensional model of a printing object to form cross-sectional image information of a single-layer structure and storing; S2, uniformly coat the liquid photocurable material and then cool it to solidify; S3, spray the liquid photocurable material at high speed through a water jet nozzle to form a water jet, and cut the solid photocurable material to form a model surface; S4, according to the The cross-sectional image information transmits ultraviolet rays to solidify the photocurable material into an irreversible solid-state structure; S5, the bottom pallet in the printing platform moves down by unit height; S6, uniformly coats the liquid photocurable material and then cools it to solidify into a reversible solid structure. melted solid photocurable material; repeat steps S3 to S5 until the finished product of the printed object is completed. The invention improves the machining precision and roughness of the product surface, and reduces the influence of the step structure produced by lamination on the precision.

Description

A 3D printing method and 3D printing components and 3D printing platform for the same

technical field

The invention belongs to the technical field of 3D printing, and relates to a 3D printing method, a 3D printing component and a 3D printing platform used for the method.

Background technique

3D printing technology is a new type of processing technology that is developing rapidly. The more mature process of 3D printing is to use the stereo light curing method SLA and digital light processing method DPL to irradiate the photosensitive liquid photocurable resin material, and print through the numerical control device. The head projects point-shaped ultraviolet rays, and irradiates the photo-curable material according to the designed layered pattern scanning path, so that a layer of photo-curable material in a specific area is excited by the light to undergo a chemical reaction to produce an irreversible curing effect, and the solid state of each layer is obtained. The structure, from top to bottom or bottom to top, is superimposed, cured and fused to form a printed product.

The above-mentioned 3D printing technology is relatively mature and can form products with relatively good accuracy. However, since the printing technology is still based on layered and superimposed methods, there is a "step effect" in layered manufacturing. If the required accuracy is to be guaranteed, it is necessary to The thickness of each layer is very thin, but at a certain microscopic scale, steps with a certain thickness will still be formed, and increasing the number of printing layers will greatly increase the printing time. If the number of layers is not enough, the steps will be more obvious. The surface of the object to be manufactured is a circular arc or inclined surface structure, which will cause deviations in accuracy, and the roughness of the surface often does not meet the requirements.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a 3D printing method, so as to solve the problem that the surface of the printing target in the prior art is a circular arc or inclined surface structure. Under the premise of ensuring better accuracy, the prior art has a large number of printing layers, which consumes a lot of printing. It takes a long time, and at a certain microscopic scale, steps with a certain thickness will still be formed, so the accuracy and roughness that can be achieved are limited.

The 3D printing method includes the following steps:

S1. Divide the three-dimensional model of the printing object into N-layer single-layer structures, and collect and store the Z-direction inclination of each point on the model surface in the single-layer structure and the cross-sectional image information of the single-layer structure;

S2. Evenly coat the liquid photocurable material on the printing platform to the thickness of the single-layer structure, and then cool it to solidify it into a meltable solid photocurable material;

S3, spraying the liquid photocurable material at high speed through the water jet nozzle to form a water jet, and the water jet cuts the solid photocurable material according to the single-layer printing information to form a model surface;

S4, transmitting ultraviolet rays according to the cross-sectional image information to cure the photocurable material into an irreversible solid-state structure;

S5, the bottom support plate supporting the solid-state structure in the printing platform moves down by a unit height;

S6, uniformly coat the liquid photocurable material on the previous solid-state structure to the thickness of the single-layer structure, and then cool it to solidify into a meltable solid-state photocurable material;

Repeat steps S3 to S5 until the finished product of the printing object is completed;

S7, heating the remaining meltable solid photocurable material on the printing platform for recycling.

Preferably, in the step S5, the bottom support plate is lowered to a certain depth to heat the meltable solid-state photo-curing material in the lower part, so that it is melted into a liquid photo-curing material for recycling, and the remaining solid-state photo-curing material in the upper part after melting is cured. The material forms a cuttable solid state layer having a thickness within the precisely controllable cut thickness threshold of the water jet.

对应球面极坐标的原点O为所述点状紫外线投射在所述单层结构中的区域中心，所述打印组件在打印过程中以所述原点O为中心旋转

所述水刀喷头相对Z向的倾斜角度为θ，所述r为固定值等于所述水刀喷头的喷口到所述区域中心的距离，所述水刀喷头仅在所述步骤S3中对打印对象的表面进行固化时打开。Preferably, the 3D printing head and the water jet nozzle are installed on the same printing component, the 3D printing head transmits dot-shaped ultraviolet rays vertically downward, and the Z-direction slope is represented by spherical coordinates as r, θ,

The origin O corresponding to the spherical polar coordinates is the center of the area where the point-shaped ultraviolet rays are projected in the single-layer structure, and the printing assembly rotates around the origin O during the printing process

The inclination angle of the water jet nozzle relative to the Z direction is θ, the r is a fixed value equal to the distance from the nozzle of the water jet nozzle to the center of the area, and the water jet nozzle only prints in the step S3. Turns on when the object's surface is being cured.

Preferably, in the step S3, the 3D printing head moves intermittently along the contour of the model surface in the single-layer structure, and the water jet nozzle sprays liquid photocurable material synchronously with the movement of the 3D printing head, and the 3D printing After the head stops moving, it transmits point-shaped ultraviolet rays, and the distance of each movement of the 3D printing head is not greater than the radius of the transmission range of the point-shaped ultraviolet rays. The positions of each stop coincide.

Preferably, the solid light-curing material is a low-hardness solid that can be cut by the water jet, and the solid structure formed by the light-curing effect has a hardness greater than that of the solid that can be cut by the water jet.

The present invention also provides a 3D printing component for the above 3D printing method, including a printing head slide installed at the movable end of the printing head translation mechanism, a 3D printing head for transmitting dot-shaped ultraviolet rays, an electric rotating shaft, a printing head The installation column, the guide plate, the angle adjustment arm, the radian sensor and the water jet nozzle, the water jet nozzle is connected to the liquid storage tank storing the liquid photocurable material through the pressurizing device, the 3D printing head is provided with an ultraviolet generator, and the The print head mounting column is rotatably installed under the print head sliding table through the electric rotating shaft, the guide plates are all provided with arc guide grooves, the guide plates are vertically arranged and are fixedly connected with the print head mounting column, the The water jet nozzle is installed on the angle adjustment arm and faces the position where the point-shaped ultraviolet light cures the solid-state light-curing material, and the end of the angle adjustment arm is fixed with an arc surface pin slidingly matched with the arc guide groove , the root of the angle adjustment arm is installed on the print head installation column, and the radian sensor is installed at the arc guide groove to detect the position of the arc pin.

Preferably, the point h/2 above the projection center of the bottom of the solid photocurable material is the center of the arc guide groove, h is the thickness of the single-layer structure, and the vertical distance between the upper and lower edges of the model surface after cutting not larger than the diameter of the point-shaped ultraviolet transmission range.

The present invention also provides a 3D printing platform for the above-mentioned 3D printing method, comprising a platform body, a support plate and a support plate lifting mechanism, wherein the platform body is provided with a platform inner cavity for accommodating the finished product of the printing object, so The supporting plate is installed in the inner cavity of the platform through the supporting plate lifting mechanism, and further includes a cooling device, a heat conduction groove and a heating device, and the cooling device and the heating device are both installed in the platform main body, The heat conduction groove is arranged in the side wall of the platform cavity and surrounds the upper part of the platform cavity, and the heat conduction groove is respectively connected to the cooling device and the heating device through a three-way reversing valve. Both the heating device and the cooling device are connected to a medium storage tank that stores a thermally conductive medium.

Preferably, the support plate includes a mesh plate and a solid plate, the top surface of the solid plate is provided with a mesh groove matched with the mesh plate, and the mesh plate is installed on the lifting mechanism of the support plate lifting mechanism. The solid plate is installed below the mesh plate through a telescopic mechanism, and when the mesh plate falls into the grid slot, the top surface of the mesh plate and the top surface of the solid plate form a flat plane.

Preferably, the depth of the grid groove is greater than the thickness of the screen plate, the bottom of the grid groove is an inclined surface or an arc surface, and the bottom of the grid groove is located at the edge of the solid plate and is lower than the bottom of the grid groove. At the center of the plate, the grid groove forms a drainage slot at the edge of the solid plate, and a number of vertical grooves corresponding to each drainage slot are provided on the inner side of the side wall of the platform cavity. The straight groove is connected with the recovery port at the bottom of the platform inner cavity, and the recovery port is connected with the solidified material recovery tank.

The present invention has the following advantages: using the printing method provided by the present invention, since the surface part of the single-layer structure analyzes the similar slope angle according to the slope slope or camber radian of the corresponding position of the three-dimensional model, the The surface part is cut by water jet, thereby cutting the stepped facade of the single-layer structure into a slope close to the surface of the three-dimensional model, so the surface accuracy and roughness of the product are greatly improved. As a result, the thickness of the single-layer structure can even be increased, and the requirements for the manufacturing precision and roughness of the product can be met, so that the printing time can be effectively reduced due to the reduction of the number of processing layers.

Since cutting is only applicable to solid structures, in the present invention, the liquid photo-cured material before cutting is cooled and solidified by the 3D printing platform, so that water jet cutting can be realized, and the liquid photo-cured material is used as a water jet material to avoid photo-cured materials. Impurities are mixed in, which affects the curing effect. The printing platform melts the lower solid light-curing material through the heating tube, so as to avoid the effect of waterjet cutting due to excessive thickness, and avoid the impact of the waterjet on the cured curing structure and cause damage to the product.

Since the hardness of the solid-state photocured material after cooling and solidification is much smaller than that of the solid structure produced by light excitation, if the photocuring of the edge portion is performed simultaneously during the cutting process, it can effectively prevent the edge portion from being deformed due to insufficient hardness after cutting. The structure of the 3D printing assembly allows the jetting direction of the water jet to change according to the movement of the 3D printing head, thereby ensuring that the cutting effect of each point is the same as the design effect of step S1, and finally achieves accurate cutting and curing of the surface of the 3D model.

Description of drawings

FIG. 1 is a schematic structural diagram of the 3D printing component in use in the present invention.

FIG. 2 is a partial enlarged view of the portion of the structure shown in FIG. 1 that projects point-shaped ultraviolet rays, and the arrows in the figure indicate the direction of ultraviolet rays projection.

FIG. 3 is a schematic diagram of the water jet spraying direction in a spherical coordinate system, wherein the arrow indicates the water jet spraying direction, and the arc segment indicates the curve on the collection point on the side surface of the single-layer structure.

FIG. 4 is a schematic structural diagram of a 3D printing platform in the present invention.

FIG. 5 is a partial cross-sectional view of the support plate in the structure shown in FIG. 4 .

FIG. 6 is a schematic diagram of the piping system of the 3D printing platform in the present invention.

The symbols in the attached drawings are: 1, print head slide, 2, electric rotating shaft, 3, print head mounting column, 4, angle adjustment arm, 5, guide plate, 6, arc guide groove, 7, arc pin, 8 , water jet nozzle, 9, 3D printing head, 10, spot UV light, 11, solid light curing material, 12, stencil, 13, solid board, 14, telescopic mechanism, 15, vertical groove, 16, heat conduction groove , 17, heating tank, 18, cooling device, 19, heating device, 20, supporting plate lifting mechanism, 21, platform main body, 22, grid groove, 23, three-way reversing valve, 24, medium storage tank, 25 , Insulation board.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, through the description of the embodiments, to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present invention.

As shown in Figures 1-6, the present invention provides a 3D printing method, which includes the following steps: S1. Divide the three-dimensional model of the printing object into N-layer single-layer structures, and collect the data of each point on the surface of the model in the single-layer structure. Z-direction slope, the cross-sectional image information of the single-layer structure is combined with the corresponding Z-direction slope of each point to form N groups of single-layer printing information for storage. Among them, the Z-direction slope is a slope for the surface of the printing object, and the two slopes are equal. For the surface of the printing object, which is an arc, as shown in Figure 3, the arrow indicates the direction of the water jet, and the arc segment indicates the Curves at the acquisition points on the side surface of the monolayer structure. In this way, if higher precision is required, the surface can be further treated by grinding, etc.

S2 , uniformly coating the liquid photocurable material on the printing platform to the thickness of the single-layer structure, and then cooling to solidify it into a fusible solid photocurable material 11 . The solid light-curing material 11 is a low-hardness solid that can be cut by the water jet, and the solid structure formed by the light-curing effect has a hardness greater than that of the solid that can be cut by the water jet.

S3. The liquid photocurable material is ejected at high speed through the water jet nozzle 8 to form a water jet, and the water jet cuts the solid photocurable material 11 along the contour trajectory of the model surface of the corresponding single-layer structure according to the single-layer printing information to form a water jet. model surface.

对应球面极坐标的原点O为所述点状紫外线10投射在所述单层结构中的区域中心，所述打印组件在打印过程中以所述原点O为中心旋转

所述水刀喷头8相对Z向的倾斜角度为θ，所述r为固定值等于所述水刀喷头8的喷口到所述区域中心的距离，所述水刀喷头8仅在所述步骤S3中对打印对象的表面进行固化时打开。The 3D printing head 9 and the water jet nozzle 8 are installed on the same printing assembly, the 3D printing head 9 transmits the dot-shaped ultraviolet rays 10 vertically downward, and the Z-direction slope is represented by spherical coordinates as r, θ,

The origin O corresponding to the spherical polar coordinates is the center of the area where the point-shaped ultraviolet rays 10 are projected in the single-layer structure, and the printing assembly rotates around the origin O during the printing process

The inclination angle of the water jet nozzle 8 relative to the Z direction is θ, and the r is a fixed value equal to the distance from the nozzle of the water jet nozzle 8 to the center of the area. The water jet nozzle 8 is only in step S3. Turns on when curing the surface of the printed object.

The 3D printing head 9 moves intermittently along the contour of the model surface in the single-layer structure, and the water jet nozzle 8 jets liquid photocurable material synchronously with the movement of the 3D printing head 9. After the 3D printing head 9 stops moving The point-shaped ultraviolet rays 10 are transmitted, and the distance that the 3D printing head 9 moves each time is not greater than the radius of the transmission range of the point-shaped ultraviolet rays 10 . The positions of the second stop overlap.

S4. Transmitting ultraviolet rays according to the cross-sectional image information causes the photocurable material to undergo chemical changes to form an irreversible solid-state structure.

S5. The bottom support plate supporting the solid-state structure in the printing platform moves downward by a unit height, and the unit height is the thickness of the single-layer structure.

The bottom support plate descends to a certain depth to heat the meltable solid-state photocurable material 11 in the lower part, so that it is melted into a liquid photocurable material for recycling, and the remaining solid photocurable material 11 in the upper part after melting forms a cuttable solid layer, The thickness of the cuttable solid state layer is within a precisely controllable cut thickness threshold of the water jet.

S6 , uniformly coat the liquid photocurable material on the previous solid structure to the thickness of the single-layer structure, fill the slits produced by water jet cutting, and then cool it to solidify into a meltable solid photocurable material 11 .

Steps S3 to S5 are repeated until the finished product of the printing object is completed.

S7 , heating the remaining meltable solid photocurable material 11 on the printing platform to melt it into a liquid photocurable material and then discharge it from the printing platform for recycling.

The part of the printed object that does not belong to the surface of the model in the cross-sectional image information can be cured by either the 3D printing head 9 or the ultraviolet rays transmitted by the DMD driving module. The latter is faster for surface projection molding, but the applicable part size is limited. In addition, although the size of the circumference of the solid-state photocurable material 11 is adapted to the cross-section of the platform cavity of the 3D printing platform, so it can provide a certain support and positioning effect, but the water jet hits the solid-state structure that is easy to cause unformed parts. Therefore, this method is suitable for the case where the water jet cannot be projected to the lower molding part. If the outer structure is easily affected by the water jet, the existing light curing method is still used for 3D printing. The thickness of the single-layer structure is reduced to meet the roughness requirements of the printing target.

The 3D printing assembly used in the above method includes a print head slide 1 installed at the movable end of the print head translation mechanism and a 3D print head 9 for transmitting dot-shaped ultraviolet rays 10, and also includes an electric rotating shaft 2, a print head mounting post 3, a guide plate 5. The angle adjustment arm 4, the arc sensor and the water jet nozzle 8, the water jet nozzle 8 is connected to the liquid storage tank storing the liquid photocurable material through the pressurizing device, and the 3D printing head 9 is provided with an ultraviolet generator, so the The print head mounting column 3 is rotatably installed under the print head slide 1 through the electric rotating shaft 2. The guide plates 5 are provided with arc guide grooves 6, and the guide plates 5 are vertically arranged and connected with the print head. The installation column 3 is fixedly connected, the water jet nozzle 8 is installed on the angle adjustment arm 4 and faces the position where the point-shaped ultraviolet rays 10 cure the solid light curing material 11 , and the end of the angle adjustment arm 4 is fixed with a The arc pin 7 is slidably matched with the arc guide groove 6 , the root of the angle adjustment arm 4 is installed on the print head mounting post 3 , and the arc sensor is installed at the arc guide groove 6 to detect the Describe the position of the arc pin 7.

The point h/2 above the projection center of the bottom of the solid photocurable material 11 is the center of the arc guide groove 6, h is the thickness of the single-layer structure, and the vertical distance between the upper and lower edges of the model surface after cutting Not larger than the diameter of the point-like ultraviolet 10 transmission range.

The 3D printing platform used in the above method includes a platform main body 21 , a supporting plate and a supporting plate lifting mechanism 20 . The supporting plate lifting mechanism 20 is installed in the inner cavity of the platform, and further includes a cooling device 18, a heat conduction groove 16 and a heating device 19, and the cooling device 18 and the heating device 19 are both installed in the platform main body 21, The heat conduction groove 16 is arranged in the side wall of the platform cavity and surrounds the upper part of the platform cavity. The heat conduction groove 16 is connected to the cooling device 18 and the heating device respectively through a three-way reversing valve 23 . The device 19, the heating device 19 and the cooling device 18 are all connected to a medium storage tank 24 which stores a thermally conductive medium.

The support plate includes a mesh plate 12 and a solid plate 13. The top surface of the solid plate 13 is provided with a mesh groove 22 that matches the mesh plate 12. The mesh plate 12 is installed on the support plate to lift. The lifting end of the mechanism 20, the solid plate 13 is installed under the screen plate 12 through the telescopic mechanism 14, when the screen plate 12 falls into the grid slot 22, the top surface of the screen plate 12 and the The top surface of the solid board 13 forms a flat plane.

The lower part of the side wall of the inner cavity of the platform is also provided with a heating tank 17 around it. A heat insulating plate 25 is provided between the heating tank 17 and the heat conduction tank 16 .

The depth of the grid grooves 22 is greater than the thickness of the screen plate 12, the bottom of the grid grooves 22 is an inclined surface or an arc surface, and the bottom of the grid grooves 22 is located at the edge of the solid plate 13 and is lower than the bottom of the grid groove 22. At the center of the solid plate 13, the grid groove 22 forms a drainage slot at the edge of the solid plate 13, and the inner side of the inner cavity of the platform is provided with a number of vertical recesses corresponding to each drainage slot. groove 15, the vertical groove 15 communicates with the recovery port at the bottom of the inner cavity of the platform, and the recovery port communicates with the solidified material recovery tank.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various insubstantial improvements made by the inventive concept and technical solutions of the present invention are adopted, or no improvement is made. The direct application of the concept and technical solutions of the present invention to other occasions falls within the protection scope of the present invention.

Claims (10)

1. A3D printing method is characterized in that: comprises the following steps:

s1, dividing the three-dimensional model of the printing object into N layers of single-layer structures, and collecting and storing Z-direction inclination of each point on the surface of the model in the single-layer structure and sectional image information of the single-layer structure;

s2, uniformly coating the liquid light-cured material on the printing platform to reach the thickness of a single-layer structure, and cooling to solidify the liquid light-cured material into a meltable solid light-cured material (11);

s3, spraying a liquid light-cured material at a high speed through a water jet head (8) to form a water jet, and cutting the solid light-cured material (11) by the water jet according to the single-layer printing information to form a model surface;

s4, transmitting ultraviolet rays according to the section image information to enable the light-cured material to be cured into an irreversible solid structure;

s5, moving a bottom supporting plate supporting the solid structure downwards in the printing platform by a unit height;

s6, uniformly coating the liquid light-cured material on the previous layer of solid structure to reach the thickness of a single-layer structure, and cooling and solidifying the liquid light-cured material into a meltable solid light-cured material (11);

repeating steps S3 to S5 until finishing of the printed object;

and S7, heating the residual meltable solid photocuring material (11) on the printing platform for recycling.

2. A 3D printing method according to claim 1, characterized in that: in the step S5, the bottom plate is lowered to a certain depth to heat the meltable solid light-curing material (11) at the lower part, so that the meltable solid light-curing material is melted into a liquid light-curing material for recycling, and the remaining solid light-curing material (11) at the upper part after melting forms a cuttable solid layer, wherein the thickness of the cuttable solid layer is within the cutting thickness threshold value of the water jet knife, which can be precisely controlled.

3. A 3D printing method according to claim 1 or 2, characterized in that: the 3D printing head (9) and the water jet head (8) are arranged on the same printing component, the 3D printing head (9) vertically downwards transmits punctiform ultraviolet rays (10), and the Z-direction inclination is expressed by a spherical coordinate

The origin O corresponding to the spherical polar coordinate is the center of the region where the punctiform ultraviolet rays (10) are projected in the single-layer structure, and the printing component rotates by taking the origin O as the center in the printing process

The inclined angle of the water jet nozzle (8) relative to the Z direction is theta, and r is a fixed value equal to the spray of the water jet nozzle (8)A distance from the opening to the center of the area, the water jet head (8) being turned on only when the surface of the printing object is cured in the step S3.

4. A 3D printing method according to claim 3, characterized in that: in the step S3, the 3D print head (9) intermittently moves along the contour of the mold surface in the single-layer structure, the water jet head (8) ejects the liquid photo-curing material in synchronization with the movement of the 3D print head (9), the 3D print head (9) transmits the dot-shaped ultraviolet ray (10) after the movement is stopped, the distance of each movement of the 3D print head (9) is not greater than the radius of the transmission range of the dot-shaped ultraviolet ray (10), and the point of acquiring the Z-direction slope in the step S1 coincides with the position of each stop of the 3D print head (9).

5. The 3D printing method according to claim 4, wherein: the solid light-cured material (11) is a low-hardness solid which can be cut by the water jet, and the hardness of the solid structure formed by the light-curing effect is greater than the hardness of the solid which can be cut by the water jet.

6. The utility model provides a 3D printing assembly, is including installing at the printer head slip table (1) of beating printer head translation mechanism expansion end and being used for transmitting 3D printer head (9) of punctiform ultraviolet ray (10), its characterized in that: still include electronic pivot (2), beat printer head erection column (3), baffle (5), angle modulation arm (4), radian sensor and water sword shower nozzle (8), water sword shower nozzle (8) are connected through pressure device and are stored the reservoir of liquid light-cured material, 3D beats printer head (9) and is equipped with ultraviolet generator, beat printer head erection column (3) and pass through electronic pivot (2) rotate to be installed beat below printer head slip table (1), baffle (5) all are equipped with arc guide slot (6), baffle (5) vertical setting and with beat printer head erection column (3) fixed connection, water sword shower nozzle (8) are installed on angle modulation arm (4) and towards punctiform ultraviolet ray (10) solidification the position of solid-state light-cured material (11), the end of angle modulation arm (4) be fixed with arc guide slot (6) sliding fit's cambered surface round pin (7), the root of the angle adjusting arm (4) is installed on the printing head mounting column (3), and the radian sensor is installed at the arc-shaped guide groove (6) to detect the position of the arc-shaped pin (7).

7. A3D printing assembly according to claim 6, wherein: the point ultraviolet rays (10) are arranged at the center h/2 above the projection center of the bottom of the solid light curing material (11) and are the circle centers of the arc guide grooves (6), h is the thickness of a single-layer structure, and the vertical distance between the upper edge and the lower edge of the cut model surface is not more than the diameter of the transmission range of the point ultraviolet rays (10).

8. The utility model provides a 3D print platform, includes platform main part (21), bearing board and bearing board elevating system (20), be equipped with the off-the-shelf platform inner chamber that holds the printing object in platform main part (21), the bearing board passes through bearing board elevating system (20) are installed in the platform inner chamber, its characterized in that: the heat-conducting type heat-conducting platform is characterized by further comprising a cooling device (18), a heat-conducting groove (16) and a heating device (19), wherein the cooling device (18) and the heating device (19) are installed in the platform main body (21), the heat-conducting groove (16) is arranged in the side wall of the inner cavity of the platform and surrounds the upper portion of the inner cavity of the platform, the heat-conducting groove (16) is connected to the cooling device (18) and the heating device (19) through a three-way reversing valve (23), and the heating device (19) and the cooling device (18) are connected to a medium storage box (24) for storing heat-conducting media.

9. A 3D printing platform according to claim 8, wherein: the bearing plate comprises a mesh plate (12) and a solid plate (13), wherein the top surface of the solid plate (13) is provided with a mesh groove (22) matched with the mesh plate (12), the mesh plate (12) is installed at the lifting end of a bearing plate lifting mechanism (20), the solid plate (13) is installed below the mesh plate (12) through a telescopic mechanism (14), the mesh plate (12) falls into the mesh groove (22), the top surface of the mesh plate (12) and the top surface of the solid plate (13) form a flat plane.

10. A 3D printing platform according to claim 8, wherein: the degree of depth of grid groove (22) is greater than the thickness of otter board (12), grid groove (22) bottom is inclined plane or cambered surface, grid groove (22) bottom is located the edge of real board (13) is less than and is located real board (13) center department, grid groove (22) are in the edge of real board (13) forms the flowing back notch, the lateral wall inboard of platform inner chamber is equipped with a plurality of vertical recess (15) that correspond each flowing back notch, vertical recess (15) intercommunication the recovery mouth of platform inner chamber bottom, retrieve a mouthful intercommunication solidified material accumulator.

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