CN114043718A - Novel 3D additive forming printing device and printing method - Google Patents
Novel 3D additive forming printing device and printing method Download PDFInfo
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- CN114043718A CN114043718A CN202111306002.XA CN202111306002A CN114043718A CN 114043718 A CN114043718 A CN 114043718A CN 202111306002 A CN202111306002 A CN 202111306002A CN 114043718 A CN114043718 A CN 114043718A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/209—Heads; Nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
Abstract
The invention discloses a novel 3D additive forming printing device and a printing method, wherein the novel 3D additive forming printing device comprises: the forming box is used for providing space for forming the 3D model; the powder spreading system is used for providing powder and uniformly spreading the powder on a bottom plate of the forming box; the printing system is used for importing the model files, carrying out layered processing on the model files to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files to generate a plurality of printing data packets, and spraying different liquids onto the paved powder in a superposition or arrangement mode by adopting a plurality of sets of spraying mechanisms according to the plurality of printing data packets; and the electric control system is used for controlling the printing system and the powder spreading system. The invention sprays different liquid materials through the multiple sets of spraying mechanisms without mixing multiple materials, and controls the dropping amount of a single material through the multiple sets of spraying mechanisms, so that the utilization rate of various materials is increased, and the waste of the materials and the pollution of waste materials to the environment are avoided.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a novel 3D additive forming printing device and a printing method.
Background
The 3D printer is also called a three-dimensional printer, is a process for rapid prototyping, adopts a layer-by-layer stacking mode to manufacture a three-dimensional model in a layered mode, the operation process is similar to that of a traditional printer, except that the traditional printer prints ink on paper to form a two-dimensional plane drawing, and the three-dimensional printer realizes layer-by-layer stacking and superposition of materials such as liquid photosensitive resin materials, molten plastic wires and gypsum powder to form a three-dimensional entity in a binder spraying or extruding mode.
There have been some 3D printing apparatus of many shower nozzles in the existing market, for example the many shower nozzles 3D printer that chinese patent CN112123770A disclosed, it includes the base, top cap and rotating electrical machines, the skin weld of base has first bracing piece, the second bracing piece has been cup jointed to the inside of first bracing piece, the screw hole has been seted up on the surface of first bracing piece and second bracing piece, first bracing piece and second bracing piece pass through screw fixed connection, the second bracing piece welds in the bottom of top cap. This 3D printing apparatus of many shower nozzles is when carrying out once printing process, and only one shower nozzle is in work, and the purpose that sets up a plurality of shower nozzles only lies in conveniently accomplishing once to print the back change and bumps the head.
However, in the additive manufacturing, a plurality of materials are involved, and due to the limitation of the execution unit and materials, the development of a new process is limited, so that some conventional processes are still used, when a plurality of printing materials are used, the plurality of materials need to be mixed first, and then the mixed materials are loaded into the spraying mechanism, which is not so efficient in the utilization rate of some materials, and a series of problems such as material waste and environmental protection are caused.
Disclosure of Invention
The invention aims to provide a novel 3D additive forming printing device and a printing method, and aims to solve the problems that the efficiency is low in additive manufacturing, material waste is easily caused and the like.
In order to solve the problems, the invention adopts the following technical scheme:
the invention relates to a novel 3D additive forming printing device, which comprises:
the forming box is used for providing space for forming the 3D model;
the powder spreading system is used for providing powder and uniformly spreading the powder on a bottom plate of the forming box;
the printing system is used for importing the model files, carrying out layered processing on the model files to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files to generate a plurality of printing data packets, and spraying different liquids onto the paved powder in a superposition or arrangement mode by adopting a plurality of sets of spraying mechanisms according to the plurality of printing data packets;
and the electric control system is used for controlling the printing system and the powder spreading system.
Preferably, the printing system comprises:
the software unit is used for importing the model files, carrying out layering processing on the model files to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files, generating a plurality of printing data packets and sending the printing data packets to the printing unit;
and the printing unit comprises a plurality of sets of spraying mechanisms, and different liquids are sprayed onto the paved powder in a superposition or arrangement mode by adopting the plurality of sets of spraying mechanisms according to a plurality of printing data packets.
Preferably, the printing unit further comprises ink supply mechanisms and circuit mechanisms which correspond to the multiple sets of jetting mechanisms one by one,
the ink supply mechanism is used for providing corresponding liquid for the corresponding injection mechanism;
the circuit mechanism is used for reading the corresponding printing data packet, converting the printing data packet into binary data and sending a control signal to the corresponding jetting mechanism based on the binary data.
Preferably, the printing unit comprises a movable beam, and the plurality of sets of jetting mechanisms are all mounted on the movable beam.
Preferably, the printing unit comprises a plurality of movable beams, the number of the movable beams is the same as that of the jetting mechanisms and is in one-to-one correspondence with the jetting mechanisms, and the jetting mechanisms are mounted on the corresponding movable beams.
Preferably, the powder laying system comprises:
the powder feeding unit is used for providing powder for the powder paving unit;
and the powder paving unit is used for uniformly paving the powder on the bottom plate of the forming box.
Preferably, the forming box is of a rectangular box structure, the bottom of the forming box is a bottom plate, four side faces of the bottom plate are sealed by side plates, and the bottom plate is connected with a lifting mechanism for driving the bottom plate to lift.
The invention also relates to a printing method based on the novel 3D additive forming printing device, which comprises the following steps:
1) putting the powder into a powder laying system, and laying a plurality of layers of powder on a bottom plate of a forming box through the powder laying system;
2) loading different liquids into multiple sets of jetting mechanisms of a printing system, each set of jetting mechanisms being loaded with one liquid;
3) importing a model file into a printing system, carrying out layering processing on the model file by the printing system to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files, and generating a plurality of printing data packets;
4) the printing system sprays various liquids through a plurality of sets of spraying mechanisms based on a plurality of data packets, and the liquids are sprayed on the paved powder in a superposition or arrangement mode;
and the operation of the powder paving system and the printing system in the step 1) and the step 4) is controlled by an electric control system.
Preferably, the step 3) further inputs a driving waveform for driving each injection mechanism, a dropping amount of a single liquid, an adding amount of each liquid, a mixing manner of dropping powder of different liquids, and a mixing sequence into the printing system.
Preferably, the print data packet generated in step 3) corresponds to the number of layers of the powder in step 1), the print data packet includes contour points of the pattern to be sprayed on the powder of the corresponding layer, and the contour points are obtained by: firstly, coordinate points are arranged on a canvas according to translation and rotation attribute transformation of a model in a model file, and then the coordinate points are filled to obtain contour points.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the printing system of the novel 3D additive forming printing device adopts the multiple sets of spraying mechanisms to spray different liquids onto the paved powder in a superposition or arrangement mode, and in the additive manufacturing process, when multiple liquid materials need to be sprayed, the multiple sets of spraying mechanisms are used for spraying different liquid materials without mixing the multiple materials, and the dropping amount of a single material is controlled by the multiple sets of spraying mechanisms, so that the utilization rate of the various materials is increased, and the waste of the materials and the pollution of the waste materials to the environment are avoided.
Drawings
Fig. 1 is a structural framework diagram of a novel 3D additive forming printing device according to the present invention;
FIG. 2 is a structural frame diagram of a set of printing units;
FIG. 3 is a graph of a predetermined modulus of a showerhead versus voltage;
FIG. 4 is a schematic diagram showing the combination of liquids in the 3D printing process in example 1;
fig. 5 is a schematic view showing a combination relationship of liquids in the 3D printing process in embodiment 2;
fig. 6 is a schematic diagram showing a combination relationship of liquids in the 3D printing process in embodiment 3.
In the figure: 1-forming box, 2-powder feeding unit, 3-powder spreading unit, 4-software unit, 5-printing unit, 51-ink supply mechanism, 52-circuit mechanism, 53-spraying mechanism, 6-electric control system, 7-material A, 8-material B, 9-material C.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.
Example 1
Referring to fig. 1, the present invention according to the present embodiment relates to a novel 3D additive molding printing apparatus, which includes a molding box 1, a powder spreading system, a printing system, and an electric control system 6.
The forming box 1 is used for providing a space for forming a 3D model, is of a rectangular box body structure, is provided with a bottom plate at the bottom, is sealed by side plates on four side surfaces of the bottom plate, is provided with an open top surface, and is connected with a lifting mechanism which is used for driving the bottom plate to lift.
The powder paving system is used for providing powder and evenly paving the powder on a bottom plate of a forming box, and comprises a powder feeding unit 2 and a powder paving unit 3, wherein the powder feeding unit 2 is used for providing the powder for the powder paving unit, the powder paving unit 3 is used for evenly paving the powder on the bottom plate of the forming box, the powder feeding unit 2 and the powder paving unit 3 are controlled to be switched on and off through an electromagnetic valve or a pneumatic valve, the powder paving unit 3 adopts a vibration mode to pave the powder, the powder paving thickness is adjustable, the adjusting range is 0.1-0.5 mm, the powder outlet width is 0.1-5 mm adjustable, the vibration frequency is 10-500 HZ adjustable, and the vibration mode can be any one of an eccentric roller mode, an electromagnetic mode or an ultrasonic mode.
The printing system is used for importing a model file, conducting layering processing on the model file to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files to generate a plurality of printing data packets, and spraying different liquids onto paved powder in a superposition or arrangement mode by adopting a plurality of sets of spraying mechanisms according to the plurality of printing data packets. The printing system comprises a software unit 4 and a printing unit 5, wherein the software unit 4 adopts a computer provided with windows 3D software, MagicaVoxe software l or Sculptris software and is used for importing a model file, carrying out layered processing on the model file to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files, generating a plurality of printing data packets and sending the printing data packets to the printing unit; referring to fig. 2, the printing unit 5 includes a plurality of sets of spraying mechanisms 53, each set of spraying mechanism 53 is separately provided with an ink supply mechanism 51 and a circuit mechanism 52, the ink supply mechanism 51 and the corresponding spraying mechanism 53 are used for conveying materials through a pump, the number of the ink supply mechanism 51, the circuit mechanism 52 and the spraying mechanism 53 is the same as that of liquid materials to be sprayed, and the ink supply mechanism 51 is used for supplying corresponding liquid to the corresponding spraying mechanism 53, the circuit mechanism 52 is used for interpreting the corresponding printing data packet and converting the corresponding printing data packet into binary data, and a control signal is sent to the corresponding spraying mechanism 53 based on the binary data, so that the spraying mechanism 53 can spray different liquids onto the paved powder in a superposition or arrangement mode according to the plurality of printing data packets. The printing unit 5 further comprises a movable beam on which the sets of ejection mechanisms 53 are mounted.
The electric control system 6 is used for controlling the printing system and the powder spreading system, namely controlling the opening and closing of the pump and the electromagnetic valve, controlling the vibration of the powder feeding unit 2, controlling the movement of the movable beam and the like.
In this embodiment, a printing method based on the novel 3D additive molding printing apparatus is described by taking an example that 3 types of printing materials (material a7 is a powder material, material B8 is a liquid material, and material C9 is a liquid material, and material a: material B: material C is 100: 2: 1.83) are stacked, and includes the following steps:
1) the material A7 is loaded into a powder laying system in a screw powder feeding mode, the powder laying system lays a plurality of layers of powder on a bottom plate of a forming box, namely 10 layers (0.3 mm per layer) of powder are laid on the bottom surface of a forming cavity in advance;
2) two different liquid materials (material B8 and material C9) are filled into an ink supply mechanism 51 matched with a plurality of sets of injection mechanisms 53 in a printing system, the ink supply mechanism 51 matched with each set of injection mechanism 53 is filled with only one liquid, namely, the material B8 and the material C9 are not mixed any more;
3) inputting a driving waveform for driving each injection mechanism, a dropping amount of a single liquid, an adding amount of each liquid, a mixing mode and a mixing sequence of dropping powder of different liquids, wherein the liquid materials related to the embodiment are two (a material B8 and a material C9), so the printing unit 5 of the embodiment comprises two injection mechanisms 53, the two injection mechanisms 53 are AMSKY512 piezoelectric spray heads (physical resolution 200DPI), the two injection mechanisms are 512 injection flow channels, the size of each flow channel is 5 × 0.7 × 0.1 mm, the mechanical stress deformation amount of the piezoelectric ceramic obtained by testing is in direct proportion to voltage to obtain 285nm/V, the volume is converted into 1PL/V according to the size of the flow channels, and the testing data is shown in figure 3; setting the driving waveform of one piezoelectric nozzle to be 60-2-6-2, and presetting the ink volume of a single ink dot to be 60 picoliters; setting the driving waveform of the other piezoelectric nozzle to be 55-2-6-2, presetting the ink amount of a single ink dot to be 55 picoliters, setting the mixing interval to be 1 second, setting the mixing mode to be overlapping, and setting the stacking sequence to be B-C; importing a model file (adopting an STL file) into a software unit 4 of a printing system, carrying out layering processing on the model file by the printing system to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files (BMP files), and starting to generate a printing data packet B and a printing data packet C; the generated printing data packet corresponds to the layer number of the powder in the step 1), the printing data packet comprises contour points of liquid needing to be sprayed on the powder of the corresponding layer, and the contour points are obtained by the following steps: firstly, coordinate points are point-on-canvas according to translation and rotation attributes of a model in a model file, namely after a 3D model is imported, the 3D model is arranged in a virtual forming box of software by using editing functions of translation, rotation, mirror image and the like; and then filling the coordinate points to obtain contour points, wherein the filling mode of the single contour point is to recalculate drawing coordinates according to different DPIs (obtain inner and outer contour maps of a single-layer pattern, and fill in the middle area of the inner and outer contour maps according to the setting of the DPI), mark a complete path and fill the contour, namely, set a path starting point, traverse the contour points based on the starting point, determine a new coordinate point, determine that the path is connected to the new coordinate point, and further close the path and fill the path.
4) The printing system sprays two kinds of liquid through two sets of spraying mechanisms 53 based on a plurality of data packets, the two sets of spraying mechanisms 53 are arranged on 1 printing beam, after the printing system is started, spraying is started from a printing initial position, the spraying frequency of the two spraying mechanisms 53 is 9093HZ, so that the liquid is sprayed onto paved powder in a superposition mode, and a mixing effect as shown in fig. 4 is formed;
the operation of the powder paving system and the printing system in the step 1) and the step 4) is controlled by an electric control system.
Example 2
The structure of the novel 3D additive forming printing apparatus according to this embodiment is the same as that of embodiment 1, and the description of this embodiment is omitted.
In this embodiment, a printing method based on the novel 3D additive molding printing apparatus is described by taking 3 types of printing materials (material a7 is a powder material, material B8 is a liquid material, material C9 is a liquid material, and material a: material B: material C is 100: 2: 1.83) as an example of a mixing manner, and includes the following steps:
1) the material A7 is loaded into a powder laying system in a screw powder feeding mode, the powder laying system lays a plurality of layers of powder on a bottom plate of a forming box, namely 10 layers (0.3 mm per layer) of powder are laid on the bottom surface of a forming cavity in advance;
2) two different liquid materials (material B8 and material C9) are filled into an ink supply mechanism 51 matched with a plurality of sets of injection mechanisms 53 in a printing system, the ink supply mechanism 51 matched with each set of injection mechanism 53 is filled with only one liquid, namely, the material B8 and the material C9 are not mixed any more;
3) inputting a driving waveform for driving each injection mechanism, a dropping amount of a single liquid, an adding amount of each liquid, a mixing mode and a mixing sequence of dropping powder of different liquids, wherein the liquid materials related to the embodiment are two (a material B8 and a material C9), so the printing unit 5 of the embodiment comprises two injection mechanisms 53, the two injection mechanisms 53 are AMSKY512 piezoelectric spray heads (physical resolution 200DPI), the two injection mechanisms are 512 injection flow channels, the size of each flow channel is 5 × 0.7 × 0.1 mm, the mechanical stress deformation amount of the piezoelectric ceramic obtained by testing is in direct proportion to voltage to obtain 285nm/V, the volume is converted into 1PL/V according to the size of the flow channels, and the testing data is shown in figure 3; setting the driving waveform of one piezoelectric nozzle to be 60-2-6-2, and presetting the ink volume of a single ink dot to be 60 picoliters; setting the driving waveform of the other piezoelectric nozzle to be 55-2-6-2, presetting the ink amount of a single ink dot to be 55 picoliters, setting the mixing interval to be 0 second, setting the mixing mode to be arrangement (staggered by 1 pixel in the X direction), and setting the stacking sequence to be B-C; importing a model file (adopting an STL file) into a software unit 4 of a printing system, carrying out layering processing on the model file by the printing system to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files (BMP files), and starting to generate a printing data packet B and a printing data packet C; the generated printing data packet corresponds to the number of layers of the powder in the step 1), the printing data packet comprises contour points of liquid needing to be sprayed on the powder of the corresponding layer, and the contour points are obtained by the following steps: firstly, coordinate points are point-on-canvas according to translation and rotation attributes of a model in a model file, namely after a 3D model is imported, the 3D model is arranged in a virtual forming box of software by using editing functions of translation, rotation, mirror image and the like; and then filling the coordinate points to obtain contour points, wherein the filling mode of the single contour point is to recalculate drawing coordinates according to different DPIs (obtain inner and outer contour maps of a single-layer pattern, and fill in the middle area of the inner and outer contour maps according to the setting of the DPI), mark a complete path and fill the contour, namely, set a path starting point, traverse the contour points based on the starting point, determine a new coordinate point, determine that the path is connected to the new coordinate point, and further close the path and fill the path.
4) The printing system sprays two kinds of liquid through two sets of spraying mechanisms 53 based on two data packets, the two sets of spraying mechanisms 53 are arranged on 1 printing beam, after the printing system is started, spraying is started from a printing initial position, the spraying frequency of the two spraying mechanisms 53 is 9093HZ, so that the liquid is sprayed onto the paved powder in an arrangement mode, and a mixing effect as shown in fig. 5 is formed;
the operation of the powder paving system and the printing system in the step 1) and the step 4) is controlled by an electric control system.
Example 3
Compared with embodiment 1, the structure of the novel 3D additive forming printing device related to this embodiment is different only in that: the two sets of injection mechanisms 53 according to the present embodiment are mounted on two movement amounts, respectively.
In this embodiment, a printing method based on the novel 3D additive molding printing apparatus is described by taking 3 types of printing materials (material a7 is a powder material, material B8 is a liquid material, material C9 is a liquid material, and material a: material B: material C is 100: 2: 1) as an example of a mixing manner, and includes the following steps:
1) the material A7 is loaded into a powder laying system in a screw powder feeding mode, the powder laying system lays a plurality of layers of powder on a bottom plate of a forming box, namely 10 layers (0.3 mm per layer) of powder are laid on the bottom surface of a forming cavity in advance;
2) two different liquid materials (material B8 and material C9) are filled into an ink supply mechanism 51 matched with a plurality of sets of injection mechanisms 53 in a printing system, the ink supply mechanism 51 matched with each set of injection mechanism 53 is filled with only one liquid, namely, the material B8 and the material C9 are not mixed any more;
3) inputting a driving waveform for driving each injection mechanism, a dropping amount of a single liquid, an adding amount of each liquid, a mixing mode and a mixing sequence of dropping powder of different liquids, wherein the liquid materials related to the embodiment are two (a material B8 and a material C9), so the printing unit 5 of the embodiment comprises two injection mechanisms 53, the two injection mechanisms 53 are AMSKY512 piezoelectric spray heads (physical resolution 200DPI), the two injection mechanisms are 512 injection flow channels, the size of each flow channel is 5 × 0.7 × 0.1 mm, the mechanical stress deformation amount of the piezoelectric ceramic obtained by testing is in direct proportion to voltage to obtain 285nm/V, the volume is converted into 1PL/V according to the size of the flow channels, and the testing data is shown in figure 3; setting the driving waveform of one piezoelectric nozzle to be 60-2-6-2, and presetting the ink volume of a single ink dot to be 60 picoliters; setting the driving waveform of the other piezoelectric nozzle to be 55-2-6-2, presetting the ink amount of a single ink dot to be 55 picoliters, setting the mixing interval to be 2 seconds, setting the mixing mode to be arrangement (staggered by 1 pixel in the X direction), and setting the stacking sequence to be B-C; importing a model file (adopting an STL file) into a software unit 4 of a printing system, carrying out layering processing on the model file by the printing system to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files (BMP files), and starting to generate a printing data packet B and a printing data packet C; the generated printing data packet corresponds to the number of layers of the powder in the step 1), the printing data packet comprises contour points of liquid needing to be sprayed on the powder of the corresponding layer, and the contour points are obtained by the following steps: firstly, coordinate points are point-on-canvas according to translation and rotation attributes of a model in a model file, namely after a 3D model is imported, the 3D model is arranged in a virtual forming box of software by using editing functions of translation, rotation, mirror image and the like; and then filling the coordinate points to obtain contour points, wherein the filling mode of the single contour point is to recalculate drawing coordinates according to different DPIs (obtain inner and outer contour maps of a single-layer pattern, and fill in the middle area of the inner and outer contour maps according to the setting of the DPI), mark a complete path and fill the contour, namely, set a path starting point, traverse the contour points based on the starting point, determine a new coordinate point, determine that the path is connected to the new coordinate point, and further close the path and fill the path.
4) The printing system sprays two kinds of liquid through two sets of spraying mechanisms 53 based on two data packets, the two sets of spraying mechanisms 53 are arranged on 1 printing beam, and after the printing system is started, spraying is started from a printing initial position, wherein the spraying frequency of one spraying mechanism 53 is 9093HZ, and the spraying frequency of the other spraying mechanism 53 is 4989HZ, so that the liquid is sprayed onto paved powder in an arrangement mode, and a mixing effect as shown in fig. 6 is formed;
the operation of the powder paving system and the printing system in the step 1) and the step 4) is controlled by an electric control system.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a novel 3D vibration material disk printing device which characterized in that, it includes:
the forming box is used for providing space for forming the 3D model;
the powder spreading system is used for providing powder and uniformly spreading the powder on a bottom plate of the forming box;
the printing system is used for importing the model files, carrying out layered processing on the model files to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files to generate a plurality of printing data packets, and spraying different liquids onto the paved powder in a superposition or arrangement mode by adopting a plurality of sets of spraying mechanisms according to the plurality of printing data packets;
and the electric control system is used for controlling the printing system and the powder spreading system.
2. The novel 3D additive molding printing device of claim 1, wherein: the printing system comprises:
the software unit is used for importing the model files, carrying out layering processing on the model files to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files, generating a plurality of printing data packets and sending the printing data packets to the printing unit;
and the printing unit comprises a plurality of sets of spraying mechanisms, and different liquids are sprayed onto the paved powder in a superposition or arrangement mode by adopting the plurality of sets of spraying mechanisms according to a plurality of printing data packets.
3. The novel 3D additive molding printing device of claim 2, wherein: the printing unit also comprises ink supply mechanisms and circuit mechanisms which are in one-to-one correspondence with the multiple sets of jetting mechanisms,
the ink supply mechanism is used for providing corresponding liquid for the corresponding injection mechanism;
the circuit mechanism is used for reading the corresponding printing data packet, converting the printing data packet into binary data and sending a control signal to the corresponding jetting mechanism based on the binary data.
4. The novel 3D additive molding printing device of claim 2, wherein: the printing unit comprises a movable beam, and a plurality of sets of spraying mechanisms are all arranged on the movable beam.
5. The novel 3D additive molding printing device of claim 2, wherein: the printing unit comprises a plurality of movable beams, the number of the movable beams is the same as that of the jetting mechanisms, the movable beams correspond to the jetting mechanisms one by one, and the jetting mechanisms are installed on the corresponding movable beams.
6. The novel 3D additive molding printing device of claim 1, wherein: the powder paving system comprises:
the powder feeding unit is used for providing powder for the powder paving unit;
and the powder paving unit is used for uniformly paving the powder on the bottom plate of the forming box.
7. The novel 3D additive molding printing device of claim 1, wherein: the forming box is of a rectangular box body structure, the bottom of the forming box is a bottom plate, four sides of the bottom plate are sealed by side plates, and the bottom plate is connected with a lifting mechanism for driving the bottom plate to lift.
8. A printing method based on the novel 3D additive forming printing device of claim 1 is characterized by comprising the following steps:
1) putting the powder into a powder laying system, and laying a plurality of layers of powder on a bottom plate of a forming box through the powder laying system;
2) loading different liquids into multiple sets of jetting mechanisms of a printing system, each set of jetting mechanisms being loaded with one liquid;
3) importing a model file into a printing system, carrying out layering processing on the model file by the printing system to obtain a plurality of two-dimensional files, converting the two-dimensional files into bitmap files, and generating a plurality of printing data packets;
4) the printing system sprays various liquids through a plurality of sets of spraying mechanisms based on a plurality of data packets, and the liquids are sprayed on the paved powder in a superposition or arrangement mode;
and the operation of the powder paving system and the printing system in the step 1) and the step 4) is controlled by an electric control system.
9. The printing method based on the novel 3D additive molding printing device according to claim 8, wherein: and 3) inputting a driving waveform for driving each spraying mechanism, the dropping amount of single liquid, the adding amount of each liquid, the mixing mode and the mixing sequence of dropping powder of different liquids into the printing system.
10. The printing method based on the novel 3D additive molding printing device according to claim 8, wherein: the printing data packet generated in the step 3) corresponds to the layer number of the powder in the step 1) one by one, the printing data packet comprises contour points of the pattern needing to be sprayed on the powder of the corresponding layer, and the contour points are obtained by the following steps: firstly, coordinate points are arranged on a canvas according to translation and rotation attribute transformation of a model in a model file, and then the coordinate points are filled to obtain contour points.
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