CN114889138B - Printing control method and three-dimensional printer - Google Patents

Printing control method and three-dimensional printer Download PDF

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Publication number
CN114889138B
CN114889138B CN202210588130.6A CN202210588130A CN114889138B CN 114889138 B CN114889138 B CN 114889138B CN 202210588130 A CN202210588130 A CN 202210588130A CN 114889138 B CN114889138 B CN 114889138B
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image
preset
temperature image
temperature
printing
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CN114889138A (en
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邓新桥
陈建刚
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Shenzhen Anycubic Technology Co Ltd
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Shenzhen Anycubic Technology Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/90—Means for process control, e.g. cameras or sensors
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The application discloses a printing control method and a three-dimensional printer, wherein the method comprises the following steps: acquiring a first temperature image on a printing area corresponding to a current printing layer; judging whether the first temperature image reaches a preset image standard or not; if the first temperature image does not reach the preset image standard, a control instruction is generated. In the application, the three-dimensional printer can determine whether the three-dimensional printer prints normally according to the detected first temperature image of the printing area, so that when the three-dimensional printer prints abnormally, a control instruction is sent out to execute the action corresponding to the control instruction, the mode of determining the abnormal printing is simple, and the cost of the three-dimensional printer can be reduced.

Description

Printing control method and three-dimensional printer
Technical Field
The application relates to the technical field of 3D printing, in particular to a printing control method and a three-dimensional printer.
Background
The 3D printing technology belongs to a rapid prototyping technology, and is a technology for constructing objects by using powdery metal or plastic and other bondable materials in a layer-by-layer stacking and accumulating mode based on digital model files.
3D printing techniques can be categorized into light curing molding (SLA), selective Laser Sintering (SLS), fused deposition rapid prototyping (FDM), and Digital Light Processing (DLP). At present, an LCD photo-curing three-dimensional printer is an open loop process, even if printing fails, the equipment is unknown, and whether printing fails can be observed only manually, so that the experience of a customer is reduced. If a print failure occurs, the model itself has no meaning, and the resin material and the user's time are wasted.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the application provides a printing control method and a three-dimensional printer, so as to overcome or partially overcome the defects in the prior art.
In a first aspect, a print control method is provided, applied to a three-dimensional printer, the method including:
acquiring a first temperature image on a printing area corresponding to a designated printing layer;
judging whether the first temperature image reaches a preset image standard or not;
and if the first temperature image does not reach the preset image standard, generating a control instruction.
Optionally, the three-dimensional printer includes an infrared sensor, and the acquiring a first temperature image on a printing area corresponding to the designated printing layer includes:
detecting an original temperature image of a designated area of the printer by the infrared sensor through an infrared detection technology;
acquiring an image part with a temperature value in a preset temperature range from the original temperature image to obtain a first temperature image on the printing area; and/or identifying a target image from the original temperature image by adopting an image identification technology to obtain a first temperature image on the printing area.
Optionally, the three-dimensional printer comprises a material box and a display, wherein the display is positioned on one side of the material box, the material box is used for containing printing consumable materials, and the display is used for transmitting light to solidify the printing consumable materials;
The printer designated area includes: a cartridge bottom area or a display area of a display;
the print area includes: an illumination area of the bottom of the material box requiring illumination or a light-transmitting area of the display requiring light transmission.
Optionally, the determining whether the first temperature image meets a preset image standard includes:
judging whether the consistency of the first temperature image and a preset exposure image of a designated printing layer is not lower than a preset threshold value, wherein the first temperature image reaches a preset image standard when the consistency is not lower than the preset threshold value; and/or the number of the groups of groups,
and judging whether the first temperature image has position deviation from a preset exposure image of the appointed printing layer, wherein the first temperature image reaches a preset image standard when the position deviation does not exist.
Optionally, the determining whether the consistency of the first temperature image and the preset exposure image of the designated printing layer is not lower than a preset threshold value includes:
judging whether the difference of the area sizes of the first temperature image and the preset exposure image exceeds a preset difference value, wherein the consistency is not lower than a preset threshold value when the difference of the area sizes does not exceed the preset difference value; and/or
Judging whether the distance between the first temperature image and the corresponding edge of the preset exposure image exceeds a preset distance, wherein the consistency is not lower than a preset threshold value when the distance between the corresponding edges does not exceed the preset distance.
Optionally, the determining whether the first temperature image has a position deviation from a preset exposure image of the designated print layer includes:
judging whether the number of the overlapping points of the first temperature image and the preset exposure image reaches the preset overlapping rate, wherein no position deviation exists when the number of the overlapping points reaches the preset overlapping rate; and/or
Acquiring preset overlapping points preset for a designated printing layer; judging whether the number of overlapping points of the first temperature image and the preset exposure image reaches the preset number of overlapping points or not; wherein, when the number of overlapping points reaches the preset number of overlapping points, no position deviation exists; and/or
Acquiring coordinate information of a first central point preset for a preset exposure image of a designated printing layer, wherein the first central point is obtained by establishing a coordinate system for the preset exposure image and defining the coordinate system according to a preset rule; establishing a coordinate system for the first temperature image according to the establishment standard of the coordinate system where the preset exposure image is located, and defining a second center point according to the preset rule; and judging whether the coordinate difference value of the second center point and the first center point exceeds a preset coordinate difference, wherein no position deviation exists when the coordinate difference value does not exceed the preset coordinate difference.
Optionally, determining whether the consistency of the first temperature image and the preset exposure image of the designated printing layer is not lower than a preset threshold value includes: converting the detected first temperature image into a second temperature image adapted to the display size; judging whether the consistency degree of the second temperature image and the preset exposure image is not lower than a preset threshold value; and/or
Judging whether the first temperature image and the preset exposure image of the appointed printing layer have position deviation or not comprises the following steps: converting the detected first temperature image into a second temperature image adapted to the display size; and judging whether the second temperature image and the preset exposure image have position deviation or not.
Optionally, the converting the detected first temperature image into a second temperature image adapted to the display size includes:
converting the detected first temperature image into a second temperature image adapted to the display pixels; and/or
The detected first temperature image is converted into a second temperature image adapted to the display size.
Optionally, the three-dimensional printer includes an ultraviolet light source located below the display for emitting ultraviolet light and transmitting the display to cure the resin material,
The obtaining a first temperature image on a printing area corresponding to the designated printing layer includes: judging whether the exposure time of the ultraviolet light source reaches a preset time threshold; if the preset time threshold is reached, acquiring a first temperature image on a printing area corresponding to the appointed printing layer;
after the first temperature image on the printing area corresponding to the designated printing layer is acquired, the method further comprises the following steps: and filtering the acquired first temperature image.
Optionally, the three-dimensional printer further comprises a lifting motor and a printing platform, wherein the lifting motor is used for controlling the printing platform to move;
the method further comprises the steps of: if the first temperature image reaches the preset image standard, judging whether all the models are printed, and if yes, controlling the lifting motor to separate the printing platform carrying the printing models from the material box.
Optionally, the method further comprises: if the first temperature image does not reach the preset image standard, controlling the three-dimensional printer to stop printing; and/or
The method further comprises the steps of: and sending the control instruction to the terminal.
In a second aspect, there is provided a three-dimensional printer comprising: a processor and a memory having stored therein a computer readable program configured to be executed by the processor, the computer readable program when executed by the processor implementing a method as claimed in any preceding claim.
The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect:
in the application, after the first temperature image on the printing area corresponding to the appointed printing layer is obtained, whether the first temperature image reaches the preset image standard is judged, if the first temperature image does not reach the preset image standard, the printer can know the problem of current printing, and a control instruction is generated to control the operation of the printer. Therefore, the three-dimensional printer of the embodiment of the invention can determine whether the three-dimensional printer normally prints according to whether the first temperature image of the printing area meets the preset image standard or not, so as to send out a control instruction during abnormal printing and execute actions corresponding to the control instruction.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
Fig. 1 shows a flow chart of a print control method according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a three-dimensional printer according to an embodiment of the invention;
fig. 3 shows a schematic configuration diagram of a print control apparatus according to an embodiment of the present invention;
wherein the printing platform 1; a magazine 2; a display 3; a light source 4; and a lifting motor 5.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The present application provides a print control method applied to a three-dimensional printer, referring to fig. 1, the print control method includes steps S11 to S13:
s11: and acquiring a first temperature image on a printing area corresponding to the designated printing layer.
Wherein, referring to fig. 2, the three-dimensional printer may include components such as a printing platform 1, a cartridge 2, and a display 3, the display 3 may be located at one side of the cartridge 2, and the printing platform 1 may be located at the other side of the cartridge 2. The cartridge 2 is for containing a resin material, the printing platform 1 is for extending into the cartridge 2, and the display 3 is for transmitting light to cure the resin material on the printing platform 1. The above specified print layer may specifically refer to a current print layer, or a previous print layer that has been printed, or other specific print layers, such as a specific layer specified by a user, such as some layers that the user considers to be particularly prone to print failure or prone to abnormal printing, some layers that have a high possibility of print failure, or the like. In some embodiments, the implementation details of the present application are combined with some layers with a higher probability of printing failure, so that the detection efficiency of abnormal printing or printing failure can be improved, and the internal operation resources can be saved. However, for convenience in describing the specific embodiments of the present application, the following description is mainly given by way of example of the current printing layer, and in other embodiments, different printing layers may be selected according to requirements, which is not limited herein.
The three-dimensional printer provided by the embodiment of the invention can adopt a photo-curing 3D printer, wherein in the printing process of the photo-curing 3D printer, 405nm ultraviolet light irradiates the resin material, the resin material is normally cured to generate heat of 40-60 ℃, and the highest temperature can reach 80 ℃. It can be seen that the resin material releases more heat when cured. The temperature of the bottom of the cartridge 2 (e.g. release film) and the temperature of the corresponding position of the display 3 close to the bottom of the cartridge 2 also become high accordingly, so the printing area corresponding to the current printing layer may be an illumination area where illumination is required at the bottom of the cartridge, or may be a light-transmitting area where light transmission is required for the display, or may generally detect an area with higher heat by detecting the corresponding printing area. It should be noted that the designated print layer may be a plurality of different print layers, and the areas or areas to be printed by the different print layers are different, that is, the corresponding print areas will be changed when each specific layer in the designated print layers is printed. For example, when printing a cylindrical solid model, each printing layer is basically a circular area with the same area, and when printing a solid pyramid solid model, each printing layer is basically a triangular area with gradually changing area. The display 3 may be an LCD (Liquid Crystal Display ) or the like, such as a black-and-white screen that can selectively transmit light in regions.
S12: and judging whether the first temperature image reaches a preset image standard or not.
The preset image standard may be an image standard of the shape, occupied area, position, and other attributes of the first temperature image, and the determination process will be described in detail later.
S13: if the first temperature image does not reach the preset image standard, a control instruction is generated.
The embodiment of the invention does not limit the specific function of the control instruction. If the control instruction can be to control the three-dimensional printer to stop printing, or the control instruction is used to control the three-dimensional printer to print out an alarm, such as a prompt message for emitting sound or light, or can be used to send to a terminal in communication connection with the three-dimensional printer, so that a user can know that the printing of the three-dimensional printer corresponding to the control instruction is abnormal and the printing cannot be performed normally.
In the application, by acquiring the first temperature image on the printing area corresponding to the current printing layer, judging whether the first temperature image reaches the preset image standard, if the first temperature image does not reach the preset image standard, the printer can know the problem of current printing, and at the moment, a control instruction is generated for controlling the operation of the printer. Therefore, the three-dimensional printer provided by the embodiment of the invention can determine whether the three-dimensional printer normally prints according to whether the first temperature image of the printing area meets the preset image standard or not, so that a control instruction is sent out during abnormal printing, the action corresponding to the control instruction is executed, the abnormal printing is determined by detecting the temperature of the printing position, the printing problem can be reliably and rapidly detected, the printer is controlled to stop printing operation in time through the control instruction after the printing failure is detected, and the printing cost of the three-dimensional printer is effectively reduced.
According to the three-dimensional printer, printing image data of models of corresponding layers in a model file are read according to the printing sequence of each layer of models, the printing image data are sent to the display 3, after the display 3 obtains the printing image data of the current printing layer of the models, a light transmission image (the light transmission image can transmit light rays, namely a light transmission area) corresponding to the printing image data is formed on an interface of the display 3, ultraviolet light emitted by the light source 4 below the display 3 passes through the light transmission image on the display 3 and then reaches the material box 2, the area, irradiated by the ultraviolet light, of the bottom end of the material box 2 is an illumination area, and resin materials of the illumination area are cured on the printing platform 1 after being illuminated. The light source 4 of this embodiment may be a UV (Ultra-Violet Ray) lamp. The ultraviolet rays emitted from the light source 4 may reach the display 3 after being reflected by the reflecting means. It will be appreciated that when a three-dimensional printer prints models of different layers, the print areas of the different layers may be different, the print times may be different, and the print areas may be different. Thus, the print area according to the model may be a light-transmitting area where the display 3 needs to transmit light, or may be an illumination area where the bottom of the cartridge 2 needs to be illuminated. That is, the printer-designated area of this embodiment may be the cartridge bottom area or the display area of the display. The printing area can be an illumination area of the bottom of the material box requiring illumination or a light transmission area of the display requiring light transmission. Of course, the printer-designated area may also be a specific position preset so as to continue to take the position as the printer-designated area. If the intermediate area a on the display 3 is often used for printing, the intermediate area a can be regarded as a printer-designated area.
In an embodiment of the present invention, when the step S11 is executed to obtain the first temperature image on the printing area corresponding to the current printing layer, the infrared sensor may detect the original temperature image of the designated area of the printer by using the infrared detection technology. Then, a printing area corresponding to the current printing layer is found out from the original temperature image, and a first temperature image on the printing area is obtained.
In the embodiment of the invention, when the infrared sensor detects infrared rays, the infrared sensor actually detects the images within the detectable range, and can not directly and selectively detect the images with corresponding shapes aiming at the images with different shapes, namely, the original temperature image detected by the infrared sensor actually comprises the temperature image except the printing area of the printing layer on the appointed area of the printer.
In an alternative embodiment, after the infrared sensor detects the original temperature image of the designated area of the printer by using the infrared detection technology, an image portion with a temperature value within a preset temperature range may be obtained from the original temperature image, so as to obtain the first temperature image on the printing area.
Assuming that the bottom area of the material box is rectangular, the current printing layer of the printing model is circular, and the printing area corresponding to the current printing layer is circular. The rectangular original temperature image of the bottom of the whole material box can be detected through the infrared sensor, and in practice, what is needed is an illumination area of the bottom of the material box, which is required to be illuminated, the illumination area is contacted with purple light emitted by a light source, resin on the illumination area is cured and heated, the temperature reaches tens of degrees or even hundreds of degrees, and a round image corresponding to the resin curing part is a first temperature image. Therefore, if the resin curing temperature ranges from 80 to 100 degrees, a temperature value in the region of 80 to 100 degrees can be obtained from the rectangular image, thereby obtaining a circular first temperature image.
In another alternative embodiment, after the infrared sensor detects the original temperature image of the designated area of the printer by using the infrared detection technology, the image recognition technology may also be used to recognize the target image from the original temperature image, so as to obtain the first temperature image on the printing area.
Let the cartridge bottom area be area a and the print area corresponding to the current print layer be area b. The original temperature image of the area a can be detected by the infrared sensor, and since the area b (i.e., the print area) is actually the area where the ultraviolet light is contacted, it is necessary to acquire the image of the area b. The embodiment of the invention can identify the target image (namely the area b) from the original temperature image corresponding to the area a by adopting the image identification technology, thereby obtaining the first temperature image on the printing area.
In one embodiment of the present invention, the resin in the cartridge 2 is cured after the ultraviolet light emitted by the light source 4 reaches the display 3, so that after the ultraviolet light reaches the display 3, the infrared sensor is triggered to be started to detect the original temperature image of the specified area of the printer by adopting the infrared detection technology, and the specified time is usually the time required for curing a printing layer of resin. In addition, after ultraviolet light emitted by the light source 4 is extinguished, resin curing is completed, namely one-layer printing of the model is realized, so that the infrared sensor can be triggered and started at the moment of the extinction of the ultraviolet light to detect an original temperature image of a designated area of the printer by adopting an infrared detection technology. For any time point for starting the detection of the infrared sensor, the embodiment of the invention can save the working time of the infrared sensor and can more accurately detect the original temperature image of the appointed area of the printer.
Of course, in order to ensure that more and more comprehensive data are collected, the infrared sensor can be kept in a continuously started state, an original temperature image is analyzed from a plurality of images collected by the infrared sensor, and when the first temperature image is analyzed, the temperature is very high and is greatly higher than the usual temperature of a designated area of the printer, so that an image containing the temperature value of the cured resin can be obtained from the plurality of images to serve as the original temperature image.
In another embodiment of the present invention, after triggering and starting an original temperature image detected by the infrared sensor, or acquiring an original temperature image from a plurality of detected images, the original temperature image may be acquired from the infrared sensor, an image portion with a temperature value within a preset temperature range may be acquired from the original temperature image, or the original temperature image may be input into an image recognition device, and the first temperature image may be recognized from the original temperature image by using an image recognition technology, so that the first temperature image may be acquired more accurately.
Since the resin is solidified to generate a large amount of heat energy, the heat energy is outwards diffused at the edge of the illumination area or the light-transmitting area to a certain extent, for example, when the instantaneous temperature generated by the resin is higher and is close to hundred degrees, the periphery of the edge of the illumination area or the light-transmitting area can reach a high temperature of tens of degrees at the same time, in addition, the temperature is not uniformly diffused in a regular shape, the temperature is diffused according to the outline of the model, for example, at the position of inward concave outline and curved edge shape, the diffusion temperature is higher, and the diffusion temperature at other gentle edges is lower, so that the temperature area is larger than the printing area or the temperature area of the current printing layer. The heat energy generated by the curing of the resin tends to be higher in the temperature of the curing center and gradually lower near the edge, and when the temperature generated by the curing of the resin is lower, the temperature near the edge in the illumination area or the light transmission area is lower, and the temperature area is smaller than the printing area of the current printing layer because the temperature area is possibly not included in the temperature area due to the selection of the threshold value. Therefore, in order to reduce erroneous determination of printing failure, whether the first temperature image reaches a preset image standard is determined by the following two ways, and the preset image standard may be an image standard of the shape, occupied area, position, and other attributes of the first temperature image.
Mode one: when the step S12 is executed to determine whether the first temperature image meets the preset image standard, it is determined whether the degree of coincidence of the first temperature image and the preset exposure image is not lower than a preset threshold. And if the consistency is not lower than the preset threshold, the first temperature image reaches the preset image standard. The embodiment can acquire preset exposure image data of the current printing layer of the model from the model file.
In an alternative embodiment, in the process of judging whether the consistency of the first temperature image and the preset exposure image is not lower than the preset threshold, the judgment can be performed according to the difference between the sizes of the areas of the first temperature image and the preset exposure image. Specifically, whether the difference between the size of the first temperature image and the preset exposure image exceeds a preset difference value is judged. If the difference of the sizes of the areas of the first temperature image and the preset exposure image does not exceed the preset difference value, the consistency of the first temperature image and the preset exposure image is not lower than a preset threshold value, namely the first temperature image reaches a preset image standard; if the difference of the sizes of the areas of the first temperature image and the preset exposure image exceeds the preset difference, the consistency of the first temperature image and the preset exposure image is lower than a preset threshold, namely the first temperature image does not reach the preset image standard.
For example, the preset difference in the size of the region is 25cm 2 In the process of printing a layer of model, calculating the area of a first temperature image of the current printing layer of the model detected by the infrared sensor to obtain the area of 150cm occupied by the first temperature image 2 And the preset exposure image occupies 130cm 2 The difference between the size of the preset exposure image and the size of the area of the first temperature image is 20cm 2 The preset difference is not more than 25cm 2 Therefore, the consistency of the first temperature image and the preset exposure image is not lower than the preset threshold, that is, the first temperature image reaches the preset image standard, and the current printing layer is successfully printed.
The preset difference value of the embodiment may be set according to the sizes of the contours of different models, for example, a larger preset difference value may be set for a model with a larger contour, and a smaller preset difference value may be set for a model with a smaller contour.
In another optional embodiment, in the process of determining whether the consistency of the first temperature image and the preset exposure image is not lower than the preset threshold, the determination may be further performed according to a distance between corresponding edges of the first temperature image and the preset exposure image. Specifically, whether the distance between the first temperature image and the corresponding edge of the preset exposure image exceeds the preset distance is judged. If the distance between the corresponding edges of the first temperature image and the preset exposure image does not exceed the preset distance, the consistency of the first temperature image and the preset exposure image is not lower than a preset threshold, namely the first temperature image reaches a preset image standard; if the distance between the first temperature image and the preset exposure image with the specified number of edges exceeds the preset distance, the consistency of the first temperature image and the preset exposure image is lower than a preset threshold, that is, the first temperature image does not reach the preset image standard, and the specified number of edges can be at least one edge.
In this embodiment, the edge of the first temperature image corresponding to the preset exposure image refers to the edge corresponding to the same position, such as the edge on the left side of the first temperature image corresponding to the edge on the left side of the preset exposure image, the edge on the right side of the first temperature image corresponding to the edge on the right side of the preset exposure image, and so on. For example, if the first temperature image has 3 edges, the designated number may be set to 2, and if the distances between the 2 corresponding edges of the first temperature image and the preset exposure image are all beyond the preset distance, the first temperature image does not reach the preset image standard. For the first temperature image having different numbers of sides, different specified numbers may be set, which is not limited by the embodiment of the present invention.
For example, the preset distance is 3cm, and in the process of printing a layer of model, the distance between the corresponding edges of the first temperature image and the preset exposure image of the current printed layer is within the range of 2-3cm, so that the edge distance between the first temperature image and the preset exposure image does not exceed the preset distance by 3cm, and the first temperature image is considered to be within the allowable error range, namely, the first temperature image meets the preset condition.
By judging the size difference between the first temperature image and the preset exposure image in the first mode, whether the occupied area of the first temperature image reaches the corresponding standard or not can be effectively judged, and whether the shape of the first temperature image and the occupied area reach the corresponding standard or not can be effectively judged by judging the distance between the first temperature image and the edge of the preset exposure image.
Mode two: when the step S12 is executed to determine whether the first temperature image reaches the preset image standard, it is determined whether there is a positional deviation between the first temperature image and the preset exposure image, and if there is no positional deviation, the first temperature image reaches the preset image standard. This embodiment acquires preset exposure image data of the current print layer of the model from the model file.
In an alternative embodiment, in the process of determining whether the first temperature image and the preset exposure image have a position deviation, the determination may be performed according to the overlapping rate of the first temperature image and the preset exposure image. Specifically, whether the number of overlapping points of the first temperature image and the preset exposure image reaches a preset overlapping rate is judged. If the number of the overlapping points of the first temperature image and the preset exposure image reaches the preset overlapping rate, the first temperature image and the preset exposure image have no position deviation; otherwise, there is a positional deviation.
For example, the preset overlapping rate is 85%, and if the overlapping rate of the number of overlapping points of the first temperature image of the illumination area and the preset exposure image is calculated to be 90%, there is no positional deviation between the first temperature image and the preset exposure image. In this embodiment, for selecting points on respective images of the first temperature image and the preset exposure image, in order to accurately perform statistics of overlapping points, a unified standard coordinate system may be set for the first temperature image and the preset exposure image, so that points on the first temperature image and points on the preset exposure image are respectively arranged according to the coordinate information of the first temperature image and the coordinate information of the preset exposure image at a unified interval, and further the overlapping rate of points of the two is calculated.
The overlapping rate of the embodiment may be calculated by dividing the number of overlapping points of the first temperature image and the preset exposure image by the number of arrangement points on the preset exposure image, which is not specifically described in the embodiment of the present invention.
In another alternative embodiment, in the process of judging whether the first temperature image and the preset exposure image have position deviation, the judgment can be further performed according to the number of overlapping points of the first temperature image and the preset exposure image. Specifically, first, a preset overlap point number set in advance for the current print layer is acquired. Then, whether the number of overlapping points of the first temperature image and the preset exposure image reaches the preset number of overlapping points is judged. If the number of overlapping points reaches the preset number of overlapping points, the first temperature image and the preset exposure image have no position deviation; otherwise, there is a positional deviation.
For example, if the number of preset overlapping points of a certain layer model is 60 and the number of overlapping points of the first temperature image of the illumination area of the current printing layer and the preset exposure image is 80 in the process of printing the layer model, the preset number of overlapping points 60 is reached, it can be known that no position deviation exists between the first temperature image and the preset exposure image, the first temperature image reaches the preset image standard, and the current printing layer is successfully printed.
In this embodiment, a unified coordinate system may be set for the first temperature image and the preset exposure image, so that the number of points on the first temperature image and the number of points on the preset exposure image are respectively arranged at a unified interval according to the coordinate information of the first temperature image and the coordinate information of the preset exposure image, and further the overlapping number of the two is analyzed.
With this embodiment, if the area difference between the layers of the model is large, a different preset number of overlapping points may be set for each layer of the model in advance, and if the area difference between the layers of the model is not large, for example, a cylindrical model may be set as a preset number of overlapping points for the model, and the preset number of overlapping points may be set as a preset number of overlapping points for each layer of the model.
In another optional embodiment, in the process of judging whether the first temperature image and the preset exposure image have position deviation, coordinate information of a first central point preset for the preset exposure image of the current printing layer can be obtained, wherein the first central point is obtained by establishing a coordinate system for the preset exposure image and defining the coordinate system according to a preset rule; establishing a coordinate system for the first temperature image according to the establishment standard of the coordinate system where the preset exposure image is located, and defining a second center point according to the preset rule; and judging whether the coordinate difference value of the second center point and the first center point exceeds a preset coordinate difference, wherein no position deviation exists when the preset coordinate difference is not exceeded.
For example, the coordinate system established for the preset exposure image is 1mm long as one coordinate unit (including a horizontal axis coordinate unit and a vertical axis coordinate unit), and the point at the lower left corner of the preset exposure image is taken as the origin of coordinates. When a first center point is defined according to a preset rule, a maximum ordinate value and a maximum abscissa value of a preset exposure image are selected, and a point corresponding to 1/2 of the maximum ordinate value and 1/2 of the maximum abscissa value is defined as the first center point. Similarly, a second center point is defined in the coordinate system of the first temperature image in the same way, and if the deviation value of the two center points is too large, the first temperature image has a position deviation from the preset exposure image.
By adopting the second mode of the embodiment of the invention, whether the position of the first temperature image reaches the corresponding position standard can be effectively judged. Through the embodiment, the problems in the printing process can be timely and effectively detected, so that damage can be timely stopped for a user, and the printing cost of the three-dimensional printer is effectively reduced.
In the embodiment of the invention, the preset exposure image used as the comparison standard is preset exposure image data of the current printing layer of the model, which is obtained from the model file. Of course, the above two ways may be combined to determine whether the first temperature image reaches the preset image standard, which is not limited in the embodiment of the present invention.
The embodiment of the invention can rapidly and effectively judge whether the printed model is qualified or not by comparing the first temperature image with the preset exposure image, if the model is not qualified, the current printing possibly has errors, and the printed model is actually detected to be not standard, the printing position is deviated and the like, and the resin material can not be effectively cured, so that the problem that the model is not printed successfully can possibly occur.
In general, in the 3D printing process, a smaller error may exist in the actually printed model and model data in the model file within an allowable range, so in the above embodiment, mainly the comparison of the similarity between the first temperature image and the preset exposure image is described, in order to provide a more various comparison standard for the user, a similarity comparison switch may also be set for the 3D printer, if the comparison switch is set to be in an on state, the comparison may be performed according to the above embodiment, and if the comparison switch is not opened, it is required that the first temperature image is completely consistent with the position and the shape of the preset exposure image.
In an alternative embodiment, after the infrared sensor detects the temperature image data of the printing position by using the infrared detection technology, it may be further determined whether the exposure time of the light source 4 reaches the preset time threshold, and generally, the resin material may be better cured after the exposure time of the light source 4 reaches a certain time. Therefore, if the exposure time of the light source 4 does not reach the preset time threshold, the infrared sensor continues to detect the temperature image data of the exposed image surface, so as to ensure effective curing of the resin material.
If the exposure time of the light source 4 reaches the preset time threshold, the first temperature image detected by the infrared sensor is collected, and the collected first temperature image is filtered (i.e. clutter is filtered, so that effective temperature image data is remained). Here, if the light source 4 employs a UV lamp, the exposure time reaches a preset time threshold, which indicates that the exposure of the UV lamp is finished. The preset time threshold is preset by the user, and is not specifically limited herein.
In this embodiment, in the process of determining whether the consistency of the first temperature image and the preset exposure image is not lower than the preset threshold, the detected first temperature image may be converted into a second temperature image adapted to the size of the display 3, and then, whether the consistency of the second temperature image and the preset exposure image is not lower than the preset threshold may be determined. Similarly, in the process of judging whether the first temperature image and the preset exposure image have position deviation, the detected first temperature image may be converted into a second temperature image with a size adapted to that of the display 3, and then, whether the second temperature image and the preset exposure image have position deviation is judged.
In this embodiment, the manner of converting the detected first temperature image into the second temperature image adapted to the size of the display 3 may be converting the detected first temperature image into the second temperature image adapted to the pixels of the display 3, i.e. converting the first temperature image into a temperature image of the same kind of pixel size as the display 3. It is also possible to convert the detected first temperature image into a second temperature image that is adapted to the size of the display 3.
According to the embodiment of the invention, the detected temperature image data is converted into the second temperature image data which is matched with the display 3 in size, so that the data can be conveniently compared on the same reference, the accuracy of temperature image data comparison is improved, and the reliability of temperature detection is further improved.
In an embodiment of the present invention, with continued reference to fig. 2, the three-dimensional printer may further comprise a lifting motor 5, the lifting motor 5 being configured to control the printing platform 1 to lift in a non-printing state and to drop in a printing state, the printing platform 1 being configured to extend into the magazine 2 and to carry a printing model.
Before step S11 is executed to obtain the first temperature image on the printing area corresponding to the current printing layer, the method further includes: if a print instruction input by a user or a print instruction issued by a cloud is received, the print image data read from the model file is sent to the display 3 (the display 3 is used for forming a light transmission area corresponding to the print image data), and then the lifting motor 5 is controlled to drop so as to extend the print platform 1 into the magazine 2, and a printing operation is performed according to the print image data. If the first temperature image reaches the preset image standard, judging whether all the models are printed, if yes, controlling the lifting motor 5 to lift so as to separate the printing platform 1 carrying the printing models from the material box 2. If not, continuing to perform the printing operation also controls the lifting motor 5 to lift up to disengage the printing platform 1 carrying the printing model from the magazine 2.
In this embodiment, after the three-dimensional printer is started, the printer is started to be initialized, a printing instruction input by a user or issued by a cloud is waited, after the instruction is received, if the instruction is judged to be the printing instruction, the model file information is read, the printing image data read from the model file is sent to the display 3, the lifting motor 5 is controlled to fall so as to extend the printing platform 1 into the material box 2, and then the light source 4 emits ultraviolet rays to start to solidify the resin material at the corresponding position in the material box 2 through the printing image of the display 3.
In an embodiment of the present invention, if the first temperature image does not reach the preset image standard, after generating the control instruction, the print control method may further include: and controlling the three-dimensional printer to stop printing according to the control instruction. If the first temperature image does not reach the preset image standard, the three-dimensional printer is controlled to stop printing, so that waste of consumable materials in the material box is avoided, electric energy is saved, and the environment-friendly requirement is met.
Alternatively, the three-dimensional printer may also be communicatively coupled to the terminal, which may be wired or wireless. The terminal may be a mobile terminal or a fixed terminal, or various terminals such as other wearable devices, for example, the terminal may be a mobile phone, a computer, a tablet, a smart watch, a smart earphone, a smart helmet, and the like.
In this embodiment, if the first temperature image does not reach the preset image standard, after the control instruction is generated, the control instruction may also be sent to the terminal, so that the user corresponding to the terminal views the three-dimensional printer corresponding to the control instruction. After the terminal receives the control instruction, a user of the terminal can determine which three-dimensional printer has a problem according to the control instruction so as to check the corresponding three-dimensional printer, and the user can reprint the model or repair the printer.
The present application also provides a print control apparatus applied to a three-dimensional printer, see fig. 3, the print control apparatus including:
an acquiring module 310, configured to acquire a first temperature image on a printing area corresponding to a current printing layer;
a judging module 320, configured to judge whether the first temperature image meets a preset image standard;
the generating module 330 is configured to generate a control instruction if the first temperature image does not reach the preset image standard.
The acquiring module 310 may also detect an original temperature image of the designated area of the printer by using an infrared detection technology through an infrared sensor;
acquiring an image part with a temperature value in a preset temperature range from an original temperature image to obtain a first temperature image on a printing area; and/or identifying the target image from the original temperature image by adopting an image identification technology to obtain a first temperature image on the printing area.
The three-dimensional printer comprises a material box and a display, wherein the display is positioned on one side of the material box, the material box is internally used for containing printing consumables, and the display is used for transmitting light to solidify the printing consumables; the printer designated area includes: a cartridge bottom area or a display area of a display; the printing area includes: an illumination area of the bottom of the material box requiring illumination or a light-transmitting area of the display requiring light transmission.
The judging module 320 is further configured to judge whether a consistency degree of the first temperature image and a preset exposure image of the current printing layer is not lower than a preset threshold, where the first temperature image reaches a preset image standard when the consistency degree is not lower than the preset threshold; and/or judging whether the first temperature image has position deviation from a preset exposure image of the current printing layer, wherein the first temperature image reaches a preset image standard when the position deviation does not exist.
The judging module 320 is further configured to judge whether a difference between the first temperature image and a region size of the preset exposure image exceeds a preset difference value, where the consistency is not lower than a preset threshold when the difference between the region sizes does not exceed the preset difference value; and/or judging whether the distance between the first temperature image and the corresponding edge of the preset exposure image exceeds a preset distance, wherein the consistency degree is not lower than a preset threshold value when the distance between the corresponding edges does not exceed the preset distance.
The judging module 320 is further configured to judge whether the number of overlapping points of the first temperature image and the preset exposure image reaches a preset overlapping rate, where no position deviation exists when the number of overlapping points reaches the preset overlapping rate; and/or obtaining preset overlapping points preset for the current printing layer; judging whether the number of overlapping points of the first temperature image and the preset exposure image reaches the preset number of overlapping points or not; wherein, when the number of overlapping points reaches the preset number of overlapping points, no position deviation exists; and/or acquiring coordinate information of a first central point preset for a preset exposure image of the current printing layer, wherein the first central point is obtained by establishing a coordinate system for the preset exposure image and defining the coordinate system according to a preset rule; establishing a coordinate system for the first temperature image according to the establishment standard of the coordinate system where the preset exposure image is located, and defining a second center point according to the preset rule; and judging whether the coordinate difference value of the second center point and the first center point exceeds a preset coordinate difference, wherein no position deviation exists when the preset coordinate difference is not exceeded.
The judging module 320 is further configured to convert the detected first temperature image into a second temperature image with a size adapted to the display; judging whether the consistency degree of the second temperature image and the preset exposure image is not lower than a preset threshold value; and/or converting the detected first temperature image into a second temperature image adapted to the display size; and judging whether the second temperature image and the preset exposure image have position deviation or not.
Wherein, the judging module 320 is further configured to convert the detected first temperature image into a second temperature image adapted to the display pixels; and/or converting the detected first temperature image into a second temperature image adapted to the display size.
The three-dimensional printer comprises an ultraviolet light source, a first temperature image, a second temperature image and a third temperature image, wherein the ultraviolet light source is positioned below the display and used for emitting ultraviolet light and transmitting the display to solidify resin materials, the first temperature image is acquired on a printing area corresponding to a current printing layer, and the first temperature image comprises: judging whether the exposure time of the ultraviolet light source reaches a preset time threshold value or not; if the preset time threshold is reached, a first temperature image on a printing area corresponding to the current printing layer is obtained; after the first temperature image on the printing area corresponding to the current printing layer is acquired, the method further comprises the following steps: the acquired first temperature image is filtered.
The three-dimensional printer also comprises a lifting motor and a printing platform, wherein the lifting motor is used for controlling the printing platform to move; if the first temperature image reaches the preset image standard, judging whether all the models are printed, and if yes, controlling the lifting motor to separate the printing platform carrying the printing models from the material box.
Wherein the print control apparatus may further include: the execution module is used for controlling the three-dimensional printer to stop printing if the first temperature image does not reach the preset image standard; and/or the method further comprises: transmitting control instruction to terminal
The application also provides a three-dimensional printer. At the hardware level, the three-dimensional printer comprises a processor, and optionally an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the three-dimensional printer may also include hardware required for other services, such as a printhead; the printing platform is used for bearing the printing model; wherein, the print head and the print platform are both movable on a first axis and a second axis.
The processor, network interface, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be classified as address buses, data buses, control buses, etc.
And the memory is used for storing programs. In particular, the program may include program code including computer-operating instructions. The memory may include memory and non-volatile storage and provide instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the computer program to form a control device for 3D printing on a logic level. And a processor executing the program stored in the memory, and specifically for executing the operations of the print control method of the above embodiment.
The present embodiments also provide a computer-readable storage medium storing one or more programs, the one or more programs including instructions, which when executed by a three-dimensional printer including a plurality of application programs, enable the three-dimensional printer to perform the print control method of any of the embodiments described above, and in particular to perform the operations of the print control method of any of the embodiments described above.
It will be clear to those skilled in the art that the specific working processes of the above-described systems, devices, modules and units may refer to the corresponding processes in the foregoing method embodiments, and for brevity, the description is omitted here.
In addition, each functional unit in the embodiments of the present invention may be physically independent, two or more functional units may be integrated together, or all functional units may be integrated in one processing unit. The integrated functional units may be implemented in hardware or in software or firmware.
Those of ordinary skill in the art will appreciate that: the integrated functional units, if implemented in software and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or in whole or in part in the form of a software product stored in a storage medium, comprising instructions for causing a computing device (e.g., a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present invention when the instructions are executed. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM), a magnetic disk, or an optical disk, etc.
Alternatively, all or part of the steps of implementing the foregoing method embodiments may be implemented by hardware (such as a personal computer, a server, or a computing device such as a network device) associated with program instructions, where the program instructions may be stored on a computer-readable storage medium, and where the program instructions, when executed by a processor of the computing device, perform all or part of the steps of the method according to the embodiments of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all technical features thereof can be replaced by others within the spirit and principle of the present invention; such modifications and substitutions do not depart from the scope of the invention.

Claims (10)

1. A print control method applied to a photo-curing three-dimensional printer, the method comprising:
acquiring a first temperature image on a printing area corresponding to a designated printing layer;
judging whether the first temperature image reaches a preset image standard or not;
if the first temperature image does not reach the preset image standard, a control instruction is generated;
the photo-curing three-dimensional printer comprises a light source, and the acquiring of the first temperature image on the printing area corresponding to the appointed printing layer comprises the following steps:
detecting an original temperature image of a designated area of the printer after the light source is turned off;
acquiring an image part with a temperature value in a preset temperature range from the original temperature image to obtain a first temperature image on the printing area; and/or identifying a target image from the original temperature image by adopting an image identification technology to obtain a first temperature image on the printing area;
The light-cured three-dimensional printer further comprises a material box and a display, wherein the display is positioned on one side of the material box, the material box is internally used for containing printing consumables, and the display is used for transmitting light emitted by the light source to cure the printing consumables;
the printer designated area includes: a cartridge bottom area or a display area of a display;
the print area includes: when the appointed printing layer is printed, an illumination area of the bottom of the material box needs illumination or a light transmission area of the display needs light transmission.
2. The method of claim 1, wherein determining whether the first temperature image meets a preset image criterion comprises:
judging whether the consistency of the first temperature image and a preset exposure image of the appointed printing layer is not lower than a preset threshold value, wherein the first temperature image reaches the preset image standard when the consistency is not lower than the preset threshold value; and/or the number of the groups of groups,
and judging whether the first temperature image has position deviation with a preset exposure image of the appointed printing layer, wherein the first temperature image reaches the preset image standard when the position deviation does not exist.
3. The method according to claim 2, wherein the determining whether the degree of coincidence of the first temperature image and the preset exposure image of the specified print layer is not lower than a preset threshold value includes:
judging whether the difference of the area sizes of the first temperature image and the preset exposure image exceeds a preset difference value, wherein the consistency is not lower than the preset threshold value when the difference of the area sizes does not exceed the preset difference value; and/or
Judging whether the distance between the first temperature image and the corresponding edge of the preset exposure image exceeds a preset distance, wherein the consistency is not lower than a preset threshold value when the distance between the corresponding edges does not exceed the preset distance.
4. The method of claim 2, wherein the determining whether there is a positional deviation of the first temperature image from a preset exposure image of the designated print layer comprises:
judging whether the number of overlapping points of the first temperature image and the preset exposure image reaches a preset overlapping rate, wherein no position deviation exists when the number of overlapping points reaches the preset overlapping rate; and/or
Acquiring preset overlapping points preset for the appointed printing layer; judging whether the number of overlapping points of the first temperature image and the preset exposure image reaches the preset number of overlapping points or not; wherein, when the number of overlapping points reaches the preset number of overlapping points, no position deviation exists; and/or
Acquiring coordinate information of a first center point preset for a preset exposure image of the appointed printing layer, wherein the first center point is obtained by establishing a coordinate system in the preset exposure image and defining the coordinate system according to a preset rule; establishing a coordinate system for the first temperature image according to the establishment standard of the coordinate system where the preset exposure image is located, and defining a second center point according to the preset rule; and judging whether the coordinate difference value of the second center point and the first center point exceeds a preset coordinate difference, wherein no position deviation exists when the coordinate difference value does not exceed the preset coordinate difference.
5. The method of claim 2, wherein the step of determining the position of the substrate comprises,
the judging whether the consistency degree of the first temperature image and the preset exposure image of the appointed printing layer is not lower than a preset threshold value or not comprises the following steps: converting the detected first temperature image into a second temperature image adapted to the display size; judging whether the consistency degree of the second temperature image and the preset exposure image is not lower than a preset threshold value; and/or
Judging whether the first temperature image and the preset exposure image of the appointed printing layer have position deviation or not comprises the following steps: converting the detected first temperature image into a second temperature image adapted to the display size; and judging whether the second temperature image and the preset exposure image have position deviation or not.
6. The method of claim 5, wherein converting the detected first temperature image to a second temperature image that is adapted to the display size comprises:
converting the detected first temperature image into a second temperature image adapted to the display pixels; and/or
The detected first temperature image is converted into a second temperature image adapted to the display size.
7. The method of claim 1, wherein the three-dimensional printer includes an ultraviolet light source positioned below the display for emitting ultraviolet light and transmitting the display to cure the resin material,
the obtaining a first temperature image on a printing area corresponding to the designated printing layer includes: judging whether the exposure time of the ultraviolet light source reaches a preset time threshold; if the preset time threshold is reached, acquiring a first temperature image on a printing area corresponding to the designated printing layer;
after the first temperature image on the printing area corresponding to the designated printing layer is acquired, the method further comprises the following steps: and filtering the acquired first temperature image.
8. The method of claim 1, wherein the three-dimensional printer further comprises a lift motor and a print platform, the lift motor for controlling movement of the print platform;
The method further comprises the steps of: if the first temperature image reaches the preset image standard, judging whether all the models are printed, and if yes, controlling the lifting motor to separate the printing platform carrying the printing models from the material box.
9. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the method further comprises the steps of: if the first temperature image does not reach the preset image standard, controlling the three-dimensional printer to stop printing; and/or
The method further comprises the steps of: and sending the control instruction to the terminal.
10. A three-dimensional printer, comprising:
a processor and a memory, the memory having stored therein a computer readable program configured to be executed by the processor, the computer readable program when executed by the processor implementing the method of any of claims 1-9.
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