CN108790151B - Detection system of photocuring three-dimensional printing equipment - Google Patents
Detection system of photocuring three-dimensional printing equipment Download PDFInfo
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- CN108790151B CN108790151B CN201810566481.0A CN201810566481A CN108790151B CN 108790151 B CN108790151 B CN 108790151B CN 201810566481 A CN201810566481 A CN 201810566481A CN 108790151 B CN108790151 B CN 108790151B
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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
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
- B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
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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
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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
Abstract
The invention discloses a detection system of photocuring three-dimensional printing equipment, which comprises: the main control system is used for processing, storing and transmitting data information and processing data fed back by other modules; the projection module is used for receiving an instruction of the master control system, processing an image signal and projecting a light pattern through the UV light source; the code reading module is used for identifying the light pattern projected by the projection module and feeding back information data to the main control system, the main control system slices a three-dimensional model which is pre-subjected to three-dimensional printing, adds a graphic identifier to the sliced slice, and stores the graphic identifier and the slice information, the main control system transmits the sliced image information to the projection module, the projection module processes an image signal and then projects the light pattern to polymerizable liquid in the material box through the UV light source, the code reading module identifies the graphic identifier in the light pattern and feeds back the information to the main control system, and the main control system can judge whether the projected light pattern is correct or not according to the information fed back by the code reading module.
Description
Technical Field
The invention relates to the additive manufacturing industry, in particular to a detection system of photocuring three-dimensional printing equipment, which can realize real-time monitoring in the printing process.
Background
The three-dimensional printer is a rapid forming machine, and based on a digital model file, a product is obtained by using a bondable material such as powdered metal or plastic and the like in a layer-by-layer printing mode. The three-dimensional printer is gradually popularized and applied due to the advantages of high manufacturing speed, multiple material types, good economic benefit and the like.
The photocuring forming method is the earliest practical rapid forming technology of a three-dimensional printer, and is characterized in that laser with specific wavelength and intensity is focused on the surface of a photocuring material to be sequentially solidified from point to line from line to surface to finish the drawing operation of one layer, then a lifting platform moves by a slice height in the vertical direction to pull away a three-dimensional printing intermediate, and the other layer is solidified after polymerizable liquid flows back. Thus, a three-dimensional printing intermediate is formed by layer-by-layer superposition, and finally, a product, namely the three-dimensional printing object is obtained. Specifically, before the printing (three-dimensional printing) is started, the three-dimensional model needs to be sliced to obtain a certain number of slices, and then patterns in each slice are digitalized or imaged, so that the illumination pattern corresponds to the slice pattern and is irradiated on the light-curing material for illumination, and the light-curing material is polymerized and cured. Among them, the DLP type three-dimensional printing method in the photo-curing three-dimensional printing is popular in the market because it can realize the product manufacturing with high precision and detail. The DLP technology creates a three-dimensional printed object by digitizing the pattern of each layer, converting the digitized pattern into an optical signal, and finally projecting the pattern onto the light-curable material liquid.
In the printing process, the sequence of the DLP optical machine for projecting the pictures corresponds to the three-dimensional model slicing sequence, the time of the DLP optical machine for projecting the pictures corresponds to the time of the lifting platform pulling away from the three-dimensional printing intermediate, if the problems occur, the structure of the three-dimensional printing intermediate can be correspondingly embodied, namely, the product precision is reduced, and if the DLP optical machine in the printing process is seriously wrong, the printed three-dimensional printing intermediate can not meet the precision requirement and is a waste product. When the DLP optical-mechanical wrong figure is difficult to distinguish by naked eyes in the printing process, the three-dimensional printed object can be found only when the quality of the three-dimensional printed object is inspected after the printing is finished, and if the three-dimensional printed object is an unqualified product, the consumed photocuring material is irreversible, so that waste is caused. Therefore, a detection system needs to be developed, which can detect the illumination pattern received by the light-cured material in real time and determine the printing process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system capable of realizing automatic real-time detection of photocuring three-dimensional printing equipment.
In order to solve the technical problem, the detection system of the photocuring three-dimensional printing device provided by the invention is arranged in the photocuring three-dimensional printing device, the photocuring three-dimensional printing device is composed of a UV light source, a material box and a forming table, polymerizable liquid is filled in the material box, the UV light source is connected with a projection system, and the detection system of the photocuring three-dimensional printing device comprises: the main control system is used for processing, storing and transmitting data information and processing data fed back by other modules; the projection module is used for receiving an instruction of the master control system, processing an image signal and projecting a light pattern to polymerizable liquid in the material box through the UV light source; the system comprises a code reading module, a main control system and a display module, wherein the code reading module is used for identifying a graphic identifier in an optical pattern projected by a projection module and feeding information data back to the main control system, the main control system slices a three-dimensional model which is pre-three-dimensionally printed, adds the graphic identifier to the sliced slice and stores the graphic identifier and the slice information, the main control system transmits the sliced image information to the projection module, the projection module projects the optical pattern through a UV light source after processing an image signal, the code reading module identifies the graphic identifier in the optical pattern and feeds the information back to the main control system, and the main control system can judge whether the projected optical pattern is correct according to the information fed back by the code reading module.
After adopting the structure, compared with the prior art, the invention has the following advantages: the main control system can judge whether the projected light pattern is correct or not according to the information of the graphic identifier in the identification light pattern fed back by the code reading module in real time, so that whether the three-dimensional printing process is smooth or not is judged.
And furthermore, the system also comprises an alarm system connected with the master control system, and when the master control system judges that the light projection pattern is incorrect, the master control system sends an opening instruction to the alarm system.
Further, the alarm system is provided with an alarm lamp or an alarm bell.
Further, the master control system adds a different graphical identifier to each slice.
Furthermore, the projection module comprises a DLP projection system, and the DLP projection system digitally processes the image signals output by the main control system and projects light through the UV light source.
Furthermore, the projection module comprises an LCD display screen and an LCD control module, the LCD control module transmits the image signal output by the main control system to the LCD display screen after digital processing, the LCD display screen displays corresponding patterns, and the UV light source irradiates the LCD display screen to project corresponding light patterns.
Further, the graphical identifier is a bar code or a two-dimensional code.
Further, a shield is disposed between the projection of the graphical identifier and the polymerizable liquid.
Drawings
FIG. 1 is a schematic diagram of the structure of the equipment used in the detection system of the photocuring three-dimensional printing equipment in the invention;
FIG. 2 is a schematic diagram of another apparatus for use in the inspection system of the stereolithographic apparatus of the present invention;
FIG. 3 is a block diagram of a detection system of the photocuring three-dimensional printing device of the present invention;
fig. 4 is a partial structural schematic diagram of a photocuring three-dimensional printing device using the monitoring system of the invention in the printing process.
Wherein: 1. a forming table; 2. a magazine; 3. a UV light source; 4. a polymerizable liquid; 5. three-dimensional printing an intermediate; 6. a code reader; 7. a graphical identifier; 8. pre-printing a pattern; 9. three-dimensional printing surface
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
It will be understood that when an element is referred to as being "on," "attached to," "connected to," combined with, "contacting" another element, etc., it can be directly on, attached to, connected to, combined with, and/or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly engaged with" or "directly contacting" another element, there are no intervening elements present. One skilled in the art will also appreciate that a structure or member that is referred to as being disposed "adjacent" another member may have portions that overlie or underlie the adjacent member.
Spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe an element or component's relationship to another element or component as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms "upward," "downward," "vertical," "horizontal," and the like are used herein for illustrative purposes only, unless explicitly indicated otherwise.
The three-dimensional printing equipment adopting the photocuring principle comprises two printing modes:
the photocuring three-dimensional printing equipment is structurally characterized by comprising a forming table 1, a material box 2 and a UV light source 3 from top to bottom respectively, wherein the UV light source 3 is arranged below the material box 2, as shown in figure 1, the bottom of the material box 2 is transparent, polymerizable liquid 4 is filled in the material box 2, the polymerizable liquid 4 is contained in the material box 2 to the surface which is irradiated and solidified and is called a three-dimensional printing surface 9, namely the bottom surface of the inner wall of the material box 2, the printing process is that the UV light source 3 irradiates the bottom surface of the material box 2 from bottom to top, the UV light penetrates through the bottom of the material box 2, the polymerizable liquid 4 on the three-dimensional printing surface 9 is solidified under the induction of light, the forming table 1 is connected with a mechanical driving device, the forming table 1 lifts a three-dimensional printing intermediate 5 (a three-dimensional structure formed after the polymerizable liquid 4 is photocured) upwards, the polymerizable liquid 4 continuously, thus manufacturing layer by layer to form a complete three-dimensional object;
the photocuring three-dimensional printing equipment is structurally characterized by comprising a UV light source 3, a material box 2 and a forming table 1 from top to bottom, wherein the forming table 1 is arranged below the material box 2, as shown in FIG. 2, polymerizable liquid 4 is filled in the material box 2, the polymerizable liquid 4 is contained in the material box 2 to a surface which is irradiated and solidified and is called a three-dimensional printing surface 9, namely the liquid level of the polymerizable liquid 4 in the material box 2, the printing process is that the UV light source 3 irradiates the material box 2 from top to bottom, the UV light irradiates the polymerizable liquid 4, the polymerizable liquid 4 on the three-dimensional printing surface 9 is solidified under the induction of the light, the forming table 1 is connected with a mechanical driving device, the forming table 1 pulls a three-dimensional printing intermediate 5 (a three-dimensional structure formed after the polymerizable liquid 4 is photocured) downwards, the polymerizable liquid 4 flows back to the three-dimensional printing surface 9 and then continues to be irradiated and solidified by the UV, forming a complete three-dimensional object, the forming table 1 and said three-dimensional printing intermediate 5 being immersed in the polymerizable liquid 4 during printing.
Before three-dimensional printing is implemented, three-dimensional modeling needs to be carried out on a pre-three-dimensional printed product, then a main control system slices the three-dimensional model, then the total slices and the model structure are analyzed, the main control system calculates the light patterns in each layer of slices and the thickness of each layer of slices, namely the corresponding UV illumination time required by each layer of slices, and the main control system controls the illumination time of the UV light source 3, the light patterns projected by a projection module and the displacement of a forming table by using the data system, so that three-dimensional printing is achieved.
As shown in fig. 3 and 4, the principle of the photocuring three-dimensional printing detection system is that a pattern identifier 7 is added to the control system to generate and read a code recognition system, the pattern identifier 7 is added to each layer of slice, the light pattern projected by each layer in the printing process is provided with the pattern identifier 7, and the corresponding slice can be recognized by the code reading recognition system, so as to realize detection on whether each layer of light pattern is projected, that is, detection of the time point of light pattern projection, and the specific implementation manner is as follows: the main control system is connected with the projection module and the UV light source 3 and is used for processing, storing and transmitting data information and processing data fed back by other modules; the projection module is used for receiving an instruction of the master control system, processing an image signal and projecting a light pattern through the UV light source 3; the main control system slices the three-dimensional model, adds a graphic identifier 7 to the sliced slice, stores the graphic identifier 7 and the sliced pattern information, transmits the sliced image information to a projection module, the image information of each layer of slice comprises the graphic identifier 7 and a pre-printed pattern 8, the projection module processes image signals and then sequentially projects the light pattern of each layer of slice to a three-dimensional printing surface 9 through a UV light source 3, the main control system is also connected with a code reading module, the code reading module comprises a code reader 6, the code reader 6 can identify the graphic identifier 7 in the projected light pattern, the code reading module feeds information data back to the main control system, and the main control system can judge whether the projected light pattern is correct according to the information fed back by the code reading module.
Because the material used for the photocuring three-dimensional printing is photosensitive resin generally, the higher the viscosity of the photosensitive resin, the better the elasticity of the cured material, the elastic material has wide market, when the high-viscosity photosensitive resin is printed in three dimensions, the higher the viscosity of the photosensitive resin, the lower the fluidity, so the time required for the backflow of the resin in the printing process is relatively longer, the solution adopted in the industry is to add black pictures between each slice, namely adding all black patterns for a period of time between the light patterns of each slice, namely the UV light source 3 projects no patterns through the projection module, and the three-dimensional printing surface 9 has no curing reaction, namely the resin can flow back in the period of time, the adopted three-dimensional printing mode is that the light patterns of the three-dimensional printing surface 9 are alternated, so the master control system can add the same pattern identifier 7 to all slices, when the light patterns are on the three-dimensional printing surface 9, that is, the reader 6 can recognize the pattern identifier 7, and when there is no pattern identifier 7 on the three-dimensional printing surface 9, that is, the reader 6 cannot recognize, the main control system can determine whether the time point of each layer of slice projection is accurate, but cannot recognize the sequence corresponding to each slice, and for the problems of slice projection repetition, wrong sequence or missing layer, the main control system cannot recognize.
For the three-dimensional printing mode capable of continuously projecting each layer of optical slices without adding black pictures among slices, the master control system needs to add different graphic identifiers 7 to each slice, the master control system can identify and preferentially store each layer of slices and the image information of the graphic identifiers 7 of the layer of slices when the optical patterns projected by each layer of slices are converted, after the code reading module feeds back the information data, the master control system can analyze the data and judge whether the real-time projected optical patterns are the slices of the second layer, so that whether the order of the projected optical patterns in the printing process is correct can be judged, and the problems of slice projection repetition, error order or missing layers and the like can be detected.
Wherein the graphical identifier 7 does not overlap the preprinted pattern 8 in the light pattern and preferably a shield is provided between the projected graphical identifier 7 and the polymerizable liquid 4, which shield may be an opaque part of the cartridge 2 or a light shield conforming to the shape of the graphical identifier 7 provided on the three-dimensional printing surface 9.
Specifically, the above-mentioned graphic identifier 7 is preferably a bar code or a two-dimensional code.
Preferably, this photocuring three-dimensional printing detecting system still includes alarm system, alarm system is connected with master control system, and when master control system judges that the projected light pattern of printing in-process goes wrong, master control system assigns opening instruction to alarm system, and wherein alarm system is equipped with warning light or alarm bell, considers printing when the process goes wrong as master control system, master control system assigns opening instruction to warning light or alarm bell, and the closing instruction of warning light or alarm bell needs the input to assign, need think promptly and close, has ensured that the operator discovers the problem that the printing process appears.
Example one
The projection module in the photocuring three-dimensional printing detection system is a DLP projection system, the DLP projection system comprises a lens, a DMD chip and a projection lens, the image signal output by the main control system is subjected to digital processing through the DMD chip by the DLP projection system, and the UV light of the UV light source 3 passes through the lens and then is processed by the DMD chip and then is projected out of each sliced light pattern through the projection lens.
Example two
The projection module in the photocuring three-dimensional printing detection system comprises an LCD display screen and an LCD control module, wherein the LCD control module transmits image signals output by the main control system to the LCD display screen after digital processing, the LCD display screen displays corresponding patterns, and after the LCD display screen is irradiated by the UV light source 3, the corresponding light patterns, namely the light patterns of each slice, are projected.
The above description is only a preferred embodiment of the present invention, and it should not be understood that the scope of the present invention is limited thereby, and it should be understood by those skilled in the art that various other modifications and equivalent arrangements can be made by applying the technical solutions and concepts of the present invention within the scope of the present invention as defined in the appended claims.
Claims (8)
1. The detection system of the photocuring three-dimensional printing equipment is arranged in the photocuring three-dimensional printing equipment, the photocuring three-dimensional printing equipment consists of a UV light source, a material box and a forming table, polymerizable liquid is filled in the material box, the photocuring three-dimensional printing equipment is characterized in that the UV light source is connected with a projection system, and the detection system of the photocuring three-dimensional printing equipment comprises:
the main control system is used for processing, storing and transmitting data information and processing data fed back by other modules;
the projection module is used for receiving an instruction of the master control system, processing an image signal and projecting a light pattern by the UV light source;
a code reading module for identifying the graphic identifier in the light pattern projected by the projection module and feeding back the information data to the main control system,
the main control system slices a three-dimensional model which is pre-printed in a three-dimensional mode, adds a graphic identifier to the sliced slice, stores the graphic identifier and slice information, transmits the sliced image information to the projection module, processes an image signal by the projection module, projects a light pattern to polymerizable liquid in a material box through a UV light source, identifies the graphic identifier in the light pattern by the code reading module, and feeds back information to the main control system, and the main control system can judge whether the projected light pattern is correct or not according to the information fed back by the code reading module.
2. The detecting system of claim 1, further comprising an alarm system connected to the host system, wherein the host system issues an on command to the alarm system when the host system information determines that the light projection pattern is incorrect.
3. The detection system of the photocuring three-dimensional printing device as set forth in claim 2, wherein the alarm system is provided with an alarm lamp or an alarm bell.
4. The detection system of a photocuring three-dimensional printing device of claim 1, wherein the master control system adds a different graphical identifier to each slice.
5. The detecting system of claim 1, wherein the projection module comprises a DLP projection system, and the DLP projection system digitally processes the image signal outputted from the main control system and projects light through a UV light source.
6. The detecting system of claim 1, wherein the projection module comprises an LCD display screen and an LCD control module, the LCD control module digitally processes the image signal output by the main control system and transmits the image signal to the LCD display screen, the LCD display screen displays a corresponding pattern, and the UV light source illuminates the LCD display screen to project a corresponding light pattern.
7. The detection system of claim 1, wherein the graphical identifier is a bar code or a two-dimensional code.
8. The detection system of claim 1, wherein a barrier is disposed between the projection of the graphical identifier and the polymerizable liquid.
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