Exposure control method and equipment for photocuring three-dimensional printing equipment and storage medium

Abstract

The invention provides an exposure control method and equipment of photocuring three-dimensional printing equipment and a storage medium, and relates to the field of three-dimensional printing. The photocuring three-dimensional printing equipment comprises a printing platform, a trough and a light source module, the light source module is used for emitting curing light to cure a to-be-cured material in the trough and is connected to the printing platform, and the method comprises the steps that the printing platform is controlled to move to a preset printing position, and the light source module is kept in a light-off state; acquiring a first detection value for representing the flow degree of the to-be-cured material in the trough; and when the first detection value is within the preset detection value range, controlling the light source module to start exposure. According to the embodiment of the invention, a user does not need to set the turn-off time of the light source module, the turn-off time is automatically and accurately determined based on the detection value representing the flowing degree of the to-be-cured material in the trough, accurate exposure of the light source module is realized, and the printing efficiency and the printing effect are improved.

Description

Technical Field

[0001] The present application relates to the field of three-dimensional printing, and in particular to an exposure control method of a photocuring three-dimensional printing device, a photocuring three-dimensional printing device, and a readable storage medium. Background Art

[0002] 3D printing, also known as additive manufacturing, is a manufacturing technology that uses digital models as the basis to stack materials layer by layer to create a physical model. At present, 3D light-curing printing technology is a printing technology that is widely used. When the printing platform is below the resin liquid level in the material tank, the curing light emitted by the light source cures the resin in the material tank, and the resin in the exposure area will cure quickly, thus completing the processing of a printing layer.

[0003] In the above printing process, after the printing platform or the formed printing model carried on the printing platform is pressed down to the release film close to the material tank, the waiting time of this process is the light-off time because the air in the material to be cured under the platform needs to be exhausted, or the material to be cured in the material tank needs to be restored from a shaking flow state to a static state. In the related art, the user needs to reserve enough or even too long fixed light-off time in advance according to the printing situation to ensure that the light-off time is sufficient, which will lead to the problem of low printing efficiency. When the user has insufficient printing experience and sets an insufficient light-off time, it may cause poor printing effect or even printing failure. Summary of the invention

[0004] In view of this, the present application provides an exposure control method for a photocuring 3D printing device, a photocuring 3D printing device and a readable storage medium, which can automatically and accurately determine the light off time and ensure accurate exposure of the light source module.

[0005] In a first aspect, an embodiment of the present application provides an exposure control method for a photocuring 3D printing device, wherein the photocuring 3D printing device comprises a printing platform, a material tank, and a light source module, wherein the light source module is used to emit curing light to cure the material to be cured in the material tank and connect it to the printing platform, and the method comprises:

[0006] Controlling the printing platform to move to a preset printing position and keeping the light source module in an off state;

[0007] Acquire a first detection value for characterizing the fluidity of the material to be solidified in the material tank;

[0008] When the first detection value is within a preset detection value range, the light source module is controlled to start exposure.

[0009] According to the above method of the embodiment of the present application, the following additional technical features may also be provided:

[0010] In the above technical solution, optionally, the light-curing three-dimensional printing device further includes a detection device, which is used to detect a detection value that can reflect the fluidity of the material to be cured in the material tank to obtain a second detection value; the first detection value used to characterize the fluidity of the material to be cured in the material tank is obtained, including:

[0011] When the light source module maintains the light-off state, obtaining one or more second detection values;

[0012] The first detection value is determined based on one or more of the second detection values.

[0013] In any of the above technical solutions, optionally, the preset printing position is a position that is a preset distance away from the bottom of the material trough, and the preset distance corresponds to the thickness of the current printing layer of the current printing model. The detection device is a force detection device, and the force detection device is used to detect the second detection value used to characterize the force on the printing platform and / or the material trough.

[0014] In any of the above technical solutions, optionally, determining the first detection value according to one or more of the second detection values ​​includes:

[0015] determining the first detection value according to changes of a plurality of the second detection values ​​along a time axis; or

[0016] The first detection value is determined according to a variance of a plurality of the second detection values ​​acquired within a continuous time period of a fourth preset time length.

[0017] In any of the above technical solutions, optionally, determining the first detection value according to one or more of the second detection values ​​includes: determining the first detection value according to changes of the plurality of the second detection values ​​along the time axis; determining the first detection value according to changes of the plurality of the second detection values ​​along the time axis includes:

[0018] Obtaining a first difference between a second detection value collected at a first time point and a second detection value collected at a second time point, wherein the first time point and the second time point are separated by a first preset time length;

[0019] The first detection value is determined according to the first difference.

[0020] In any of the above technical solutions, optionally, when the first detection value is within a preset detection value range, controlling the light source module to start exposure includes:

[0021] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure; or

[0022] When the first detection value is less than a first threshold value and greater than a third threshold value, the light source module is controlled to start exposure; the third threshold value is a negative number or 0, and the first threshold value is a positive number;

[0023] The method further comprises:

[0024] When the absolute value of the first detection value is greater than a second threshold, a first prompt message is issued, the first prompt message is used to prompt that the material to be solidified is abnormal, and the second threshold is greater than the first threshold.

[0025] In any of the above technical solutions, optionally, after determining the first detection value according to the first difference, the method further includes:

[0026] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a third time point; the third time point is later than the second time point and the first time point on the time axis;

[0027] Obtaining a second difference between a second detection value collected at a second time point and a second detection value collected at a third time point, wherein the second time point and the third time point are separated by a second preset time length;

[0028] determining the first detection value according to the second difference;

[0029] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure;

[0030] And / or, after determining the first detection value according to the first difference, the method further includes:

[0031] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a fourth time point and a second detection value collected at a fifth time point; at least one of the fourth time point and the fifth time point is later than the second time point and the first time point on the time axis;

[0032] Obtaining a third difference between the second detection value collected at the fourth time point and the second detection value collected at the fifth time point, wherein the fourth time point and the fifth time point are separated by a third preset time length;

[0033] Determining the first detection value according to the third difference;

[0034] When the absolute value of the first detection value is less than a first threshold, the light source module is controlled to start exposure.

[0035] In any of the above technical solutions, optionally, the method further includes:

[0036] Record the total time the printing platform remains in the light-off state after it moves to the preset printing position;

[0037] When the total time is longer than a preset light-off time threshold, a second prompt message is issued, where the second prompt message is used to prompt that the detection device is abnormal or the working environment of the light-curing three-dimensional printing device is abnormal.

[0038] In any of the above technical solutions, optionally, the method further includes:

[0039] Obtaining the viscosity of the material to be solidified;

[0040] The first threshold is determined according to the viscosity of the material to be solidified, and there is a positive correlation between the first threshold and the viscosity.

[0041] In any of the above technical solutions, optionally, the method further includes:

[0042] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the first threshold value according to the platform connection surface area, wherein the first threshold value is positively correlated with the platform connection surface area;

[0043] When the printing platform is printing other layers besides the first layer of the model, the layer area of ​​the previous layer of the current layer of the currently printed model is obtained, and the size of the first threshold is determined according to the layer area, and the size of the first threshold is positively correlated with the size of the layer area.

[0044] In any of the above technical solutions, optionally, the method further includes:

[0045] Obtaining the viscosity of the material to be solidified;

[0046] Determining a first coefficient according to the viscosity of the material to be solidified;

[0047] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the second coefficient according to the platform connection surface area;

[0048] When the printing platform is printing a layer other than the first layer of the model, obtaining a layer area of ​​a layer above the current layer of the currently printed model, and determining a third coefficient according to the layer area;

[0049] The first threshold is determined according to the first coefficient and the second coefficient; or the first threshold is determined according to the first coefficient and the third coefficient.

[0050] In any of the above technical solutions, optionally, before controlling the printing platform to move to a preset printing position, the method further includes:

[0051] reading the detection value of the detection device;

[0052] When the number of failures in reading the detection value of the detection device is greater than or equal to a preset number threshold, a third prompt message is issued, wherein the third prompt message is used to prompt that the detection device is abnormal;

[0053] After the third prompt information is sent, the method further includes:

[0054] Obtaining feedback information from the user based on the third prompt information;

[0055] When the feedback information is the first feedback information, re-reading the detection value of the detection device and resetting the number of failures in reading the detection value of the detection device;

[0056] When the feedback information is the second feedback information, a fourth prompt information is issued, and the fourth prompt information is used to prompt that the light-curing three-dimensional printing device is working abnormally.

[0057] In a second aspect, an embodiment of the present application provides a light-curing 3D printing device, comprising:

[0058] Printing platform, used to connect the printing model;

[0059] A material trough, used to contain the material to be cured;

[0060] A light source module, used for projecting curing light to cure the material to be cured in the material tank and connect it to the printing platform;

[0061] A memory storing programs or instructions;

[0062] A processor, wherein when executing the program or instruction, the processor implements the steps of the exposure control method for a photo-curing three-dimensional printing device as described in any one of the first aspects.

[0063] In the above technical solution, optionally, the device further includes:

[0064] Driving mechanism;

[0065] A vertical motion mechanism connected to the driving mechanism;

[0066] A cantilever, wherein a first end of the cantilever is connected to the printing platform, and a second end of the cantilever is connected to the vertical motion mechanism;

[0067] A detection device is arranged on the surface of the cantilever corresponding to the opening position of the cantilever, and the detection device is used to detect the deformation amount of the cantilever.

[0068] In a third aspect, an embodiment of the present application provides a readable storage medium having a program or instruction stored thereon, which, when executed by a processor, implements the steps of the exposure control method for a photocuring 3D printing device as described in any one of the first aspects.

[0069] In the embodiment of the present application, the printing platform is controlled to descend so as to move it to the preset printing position. When the printing platform is in the preset printing position, the light source module is controlled to keep the light off. The descent of the printing platform will cause the flow of the material to be cured in the material tank. The flow degree of the material to be cured is detected to obtain a first detection value for characterizing the flow degree of the material to be cured in the material tank. It is judged whether the first detection value is in the preset detection value range. When the first detection value is in the preset detection value range, it indicates that the leveling of the material to be cured is basically completed. At this time, the light off time of the light source module is controlled to end, that is, the light source module is controlled to display the image and start exposure. In this way, exposure after the material to be cured is leveled can ensure a good printing effect and printing success rate, and can avoid the existence of too long light off time after the material to be cured is leveled, which can improve the printing efficiency. In the embodiment of the present application, the specific light off time of the light source module can be set in advance according to the printing experience. Based on the detection value characterizing the flow degree of the material to be cured in the material tank, the light off time can be automatically and accurately determined, and the timely and accurate exposure control of the light source module can be realized, thereby improving the printing efficiency and printing effect.

[0070] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0072] Figure 1 A schematic flow chart showing an exposure control method of a light-curing 3D printing device according to an embodiment of the present application is shown;

[0073] Figure 2 A schematic structural diagram of a light-curing three-dimensional printing device according to an embodiment of the present application is shown.

[0074] Among them, the corresponding relationship between the reference numerals and the component names in the figure is:

[0075] 201 printing platform, 202 material trough, 203 light source module, 204 vertical motion mechanism, 205 cantilever, 206 detection device, 2031 display screen, 2032 light source. DETAILED DESCRIPTION

[0076] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0077] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0078] In conjunction with the accompanying drawings, the exposure control method of the photocuring 3D printing device, the photocuring 3D printing device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0079] The embodiment of the present application provides an exposure control method for a light-curing 3D printing device, wherein the light-curing 3D printing device comprises a printing platform, a material tank and a light source module, wherein the light source module is used to emit curing light to cure the material to be cured in the material tank and connect it to the printing platform. Figure 1 As shown, the method includes:

[0080] Step 101, controlling the printing platform to move to a preset printing position, and keeping the light source module in an off state;

[0081] Step 102, obtaining a first detection value for characterizing the fluidity of the material to be solidified in the material tank;

[0082] Step 103: When the first detection value is within a preset detection value range, control the light source module to start exposure.

[0083] It should be noted that the material to be cured in the material tank is cured and connected to the printing platform. The material to be cured in the material tank can be cured to be directly connected to the printing platform, or the material to be cured in the material tank can be cured to be connected to the printed part of the model, thereby indirectly connecting to the printing platform.

[0084] In this embodiment, when printing each printing layer of the printing model, the printing platform is controlled to descend and move to a preset printing position. When the printing platform is at the preset printing position, the light source module is controlled to remain in an off state.

[0085] The descent of the printing platform will cause the material to be cured (for example, resin) in the material tank to flow, and the degree of flow of the material to be cured is detected to obtain a first detection value for characterizing the degree of flow of the material to be cured in the material tank. Among them, a large degree of flow of the material to be cured indicates that the downward pressure of the printing platform causes air to enter the material to be cured, and the discharge of air causes a large degree of flow of the material to be cured, or the action of lifting and pressing down the platform stirs the material to be cured in the material tank, causing the material to be cured in the material tank to be in a state of large-scale shaking flow; a small degree of flow of the material to be cured indicates that the air is about to be exhausted, and the shaking flow of the material to be cured gradually stops, so that the contact between the material to be cured and the printing platform or the printing model carried on the printing platform tends to be consistent, and the degree of flow of the material to be cured is small.

[0086] Determine whether the first detection value is within the preset detection value range. When the first detection value is within the preset detection value range, it indicates that the leveling of the material to be cured is basically completed, indicating that the contact trend between the material to be cured and the printing platform or the printing model carried on the printing platform is consistent, the light-off time of the light source module ends, and the image displayed by the light source module begins to be exposed to realize light curing of the current layer, and then release is performed to realize printing of the current layer.

[0087] In one embodiment, when the current layer is the last layer of the printed model, the printing of the printed model is completed after the current layer is printed; when the current layer is not the last layer of the printed model, the printing of the next layer of the current layer is continued.

[0088] In the embodiment of the present application, the user does not need to set the light-off time of the light source module, but the light-off time is automatically and accurately determined based on the detection value that characterizes the flow degree of the material to be cured in the material tank, so as to realize the timely and accurate exposure of the light source module, and improve the printing efficiency and printing effect. The embodiment of the present application can realize exposure after confirming that the leveling of the material to be cured is basically completed, and can avoid the shaking of the material to be cured causing the device to expose the flowing material to be cured in the exposure area, and part of the material to be cured that has been exposed for a period of time flows outside the exposure area, causing contamination of the material to be cured in the material tank, affecting subsequent printing; and can avoid the shaking of the material to be cured causing the material to be cured in the material tank to flow between the non-exposed area and the exposed area, and causing the material to be cured that was not in the exposure area in the early stage of exposure to flow into the exposure area in the later stage of exposure, and causing the exposure time of the material to be cured in the exposure area to be insufficient, thereby causing the curing to fail, and the model to be incomplete, the model to be broken or the model to fall off. In a specific embodiment, the material to be cured can be a resin, or other liquid material to be cured, or a powdered material to be cured with good fluidity.

[0089] In addition, the embodiments of the present application can also avoid printing failures caused by external environmental shaking during the light-off time. For example, during the light-off time, the external environment, such as the shaking of the desktop, causes the resin to flow again. Some embodiments of the present application can identify that the first detection value caused by the shaking exceeds the preset detection value range, and can continue to detect the first detection value until the shaking calms down and the resin returns to calmness so that the first detection value is within the preset detection value range, thereby ensuring that the exposure is in the state of resin leveling and ensuring the printing effect.

[0090] In one embodiment of the present application, the photocuring 3D printing device further includes a detection device, the detection device is used to detect a detection value that can reflect the fluidity of the material to be cured in the material tank to obtain a second detection value; the acquisition of the first detection value used to characterize the fluidity of the material to be cured in the material tank includes:

[0091] When the light source module maintains the light-off state, obtaining one or more second detection values;

[0092] The first detection value is determined based on one or more of the second detection values.

[0093] In this embodiment, the photocuring 3D printing device also includes a detection device, which is used to obtain a detection value reflecting the fluidity of the material to be cured in the material tank to obtain a second detection value, that is, the second detection value is used to characterize the fluidity of the material to be cured in the material tank.

[0094] When the light source module remains in the off state, one or more second detection values ​​detected by the detection device for characterizing the fluidity of the material to be cured in the material tank are obtained, and the first detection value is determined based on the one or more second detection values. When the second detection value is 1, the second detection value can be directly used as the first detection value. When the second detection value is multiple, the first detection value can be obtained by calculating the difference, variance or average of the second detection values.

[0095] It should be noted that when the second detection value is 1, the second detection value is directly used as the first detection value, and the preset detection value range needs to change continuously as the model printing continues, which is affected by the current layer area of ​​the model, the viscosity of the resin, the continuous accumulation of the model's own weight, etc. When the second detection value is multiple, the preset detection value range may also change continuously as the model printing continues, which may also be affected by the current layer area of ​​the model, the viscosity of the resin, etc.

[0096] In an embodiment of the present application, a detection device is provided on the light-curing three-dimensional printing equipment to obtain the flow degree of the material to be cured in the material tank, thereby automatically determining the light-off time of the light source module according to the flow degree of the material to be cured in the material tank, thereby ensuring accurate exposure of the light source module.

[0097] In one embodiment of the present application, the preset printing position is a position that is a preset distance away from the bottom of the material trough, and the preset distance corresponds to the thickness of the current printing layer of the current printing model. The detection device is a force detection device, and the force detection device is used to detect the second detection value used to characterize the force on the printing platform and / or the material trough.

[0098] In this embodiment, the preset printing position is a position at a preset distance from the bottom of the material trough, and a screen of the light source module is provided at the bottom of the material trough, so the preset printing position is also equivalent to the position where the printing platform descends to a preset distance from the screen. In addition, it should be noted that the above-mentioned preset distance depends on the thickness of the current printing layer of the current printing model, because when printing the current printing layer, it is necessary to control the distance between the lower surface of the printing platform or the lower surface of the formed printing model carried by the printing platform and the screen according to the thickness of the current printing layer. For example, if the thickness of the current printing layer is a, then the distance between the lower surface of the printing platform or the lower surface of the formed printing model carried by the printing platform and the screen is controlled to be a, that is, the preset distance is a at this time.

[0099] In one embodiment, the detection device may be a force detection device, a deformation detection device, etc., which can detect the deformation amount at a specific position of a specific component and other physical quantities that can show the change of its force, such as tension, gravity, pressure, torque, etc., and may specifically be some devices for detecting force changes, such as elastic resistance strain gauges and tension sensors. In some embodiments, the detection device is disposed on the cantilever, and specifically may be attached to the upper surface of the cantilever, and can detect the deformation of the cantilever, and the deformation of the cantilever reflects the force on the printing platform.

[0100] In some embodiments, the detection device is disposed on the bottom wall or other position of the material trough of the light-curing 3D printing device to detect the stress condition of the material trough.

[0101] Alternatively, the detection device may also be a device that can detect deformation, such as a photoelectric detection device or an image detection device. For example, the image detection device includes a camera and an image analysis device. The camera is used to capture the image of the cantilever, and the image analysis device analyzes the deformation and force of the cantilever through the image. The location of the image analysis device on the light-curing three-dimensional printing device is not limited, as long as a clear image of the cantilever can be captured.

[0102] Alternatively, the detection device can also be other types of sensors for detecting the flow of the material to be cured, for example, a flow sensor, which can be set on the side wall of the material trough. When the material to be cured flows through the flow sensor, it will convert the flow of the material to be cured into voltage or current, thereby realizing real-time monitoring of the flow.

[0103] The present application can accurately judge the flow condition of the material to be cured based on the detection value of the detection device, and then determine the light-off time, thereby improving the printing efficiency and printing effect.

[0104] In one embodiment of the present application, determining the first detection value according to one or more second detection values ​​includes:

[0105] The first detection value is determined according to changes of the plurality of second detection values ​​along the time axis.

[0106] In this embodiment, the first detection value is determined according to the change of the plurality of second detection values ​​along the time axis, that is, the first detection value reflects the change of the flow of the material to be solidified within a period of time, that is, the degree of flow.

[0107] In the embodiment of the present application, the fluidity of the material to be cured is determined by multiple second detection values ​​that change with time. Compared with using one detection value to determine the fluidity of the material to be cured, this can improve the accuracy of the fluidity of the material to be cured, thereby improving the accuracy of exposure control of the light source module.

[0108] In one embodiment of the present application, determining the first detection value according to one or more second detection values ​​includes:

[0109] The first detection value is determined according to a variance of a plurality of second detection values ​​acquired within a continuous time period of a fourth preset time length.

[0110] For example, 30 second detection values ​​are obtained in a continuous time period of 0.5s or 1s, and then the variance of the 30 second detection values ​​is calculated, and the variance is used as the first detection value or the variance is normalized and transformed into the first detection value. In this way, the change of the second detection value in the continuous time period of 1s can be accurately reflected, that is, the change of the fluidity of the material to be cured in the material tank can be accurately reflected. Therefore, when the first detection value is less than the first threshold value, that is, when it is confirmed that the change of the fluidity of the material to be cured in the material tank in a continuous time period is small, it is determined that the leveling of the resin is completed, and the contact trend of the resin with the printing platform or the printing model carried on the printing platform is consistent, so as to determine that the light-off time is over, and control the light source module to start exposure, and can automatically and accurately determine the light-off time, realize accurate exposure of the light source module, and improve printing efficiency and printing effect.

[0111] In one embodiment of the present application, determining the first detection value according to one or more second detection values ​​includes: determining the first detection value according to changes of the plurality of second detection values ​​along the time axis; determining the first detection value according to changes of the plurality of second detection values ​​along the time axis includes:

[0112] Obtaining a first difference between a second detection value collected at a first time point and a second detection value collected at a second time point, wherein the first time point and the second time point are separated by a first preset time length;

[0113] The first detection value is determined according to the first difference.

[0114] In this embodiment, the printing platform is controlled to descend to the preset printing position, and the light source module is kept off, and the second detection value b1 collected by the detection device at the first time point is read, and after the first preset time is delayed, the second detection value b2 collected by the detection device at the second time point is read, wherein the value range of the first preset time length can be 0.1s to 1s. The difference between the second detection value b2 and the second detection value b1 is calculated to obtain the first difference m1, which reflects the flow of the material to be cured within the first preset time length, and then the first detection value is determined according to the first difference m1.

[0115] In some embodiments, the first difference may be directly used as the first detection value, or the first difference may be transformed by a function to obtain the first detection value.

[0116] In the embodiment of the present application, the difference between two detection values ​​separated by a first preset time length is used to characterize the fluidity of the material to be cured, which is then used to determine the light-off time, thereby improving the exposure accuracy of the light source module.

[0117] In one embodiment of the present application, when the first detection value is within a preset detection value range, controlling the light source module to start exposure includes:

[0118] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure;

[0119] The method further comprises:

[0120] When the absolute value of the first detection value is greater than a second threshold, a first prompt message is issued, the first prompt message is used to prompt that the material to be solidified is abnormal, and the second threshold is greater than the first threshold.

[0121] In this embodiment, the absolute value of the first detection value is compared with the first threshold value to determine whether the absolute value of the first detection value is less than the first threshold value, and the first threshold value is a threshold value used to determine whether the material to be cured tends to be stationary. If the absolute value of the first detection value is less than the first threshold value, it indicates that the flow degree of the material to be cured in the material tank is small and has tended to be stationary, that is, the material to be cured has completed the backflow, and the preset detection value range is the range less than the first threshold value. At this time, the light off time ends, and the light source module is controlled to start exposure to achieve the curing of the material to be cured.

[0122] In one embodiment, the absolute value of the first detection value is compared with the second threshold value. When the absolute value of the first detection value is greater than the second threshold value, it indicates that the difference between the two detection values ​​separated by the first preset time length is large. For example, the second detection value b1 collected at the first time point is large, while the second detection value b2 collected at the second time point is small. This situation may be due to the presence of printed model residues in the material to be cured in the material tank at the second time point, resulting in a significant reduction in the fluidity of the material to be cured from the detection perspective. In fact, the significant reduction in the fluidity of the material to be cured in this case does not mean that the resin is leveled, but should be regarded as an abnormal situation. Therefore, in this case, the first prompt message is issued to remind the user that the material to be cured is abnormal, ensuring that the user can take effective measures in a timely manner, such as cleaning the model residue, to ensure the smooth progress of subsequent printing.

[0123] In one embodiment of the present application, when the first detection value is within a preset detection value range, controlling the light source module to start exposure includes:

[0124] When the first detection value is less than a first threshold value and greater than a third threshold value, the light source module is controlled to start exposure; the third threshold value is a negative number or 0, and the first threshold value is a positive number;

[0125] In this embodiment, when the third threshold value is 0, it is possible to avoid the second detection value being stable due to the abnormality of the detection device, so that the first detection value is always calculated as 0, which makes it impossible for the abnormality of the detection device to accurately determine whether the resin flow is completed, thereby preventing the misjudgment of resin leveling due to the abnormality of the detection device, and improving the control accuracy of the time point when the light-off time ends.

[0126] In this embodiment, when the third threshold is a negative number, it can be understood that the first detection value is the difference between the second detection value collected at the first time point and the second detection value collected at the second time point. The difference may be positive or negative due to the fluctuation of resin flow. This embodiment does not take the absolute value of the first detection value, but makes a corresponding judgment on the first detection value through the value range between the negative third threshold and the positive first threshold, which can facilitate more personalized algorithm optimization design, make the judgment of the time point when resin leveling is completed more accurate, and can facilitate improving printing effects.

[0127] In one embodiment of the present application, after determining the first detection value according to the first difference, the method further includes:

[0128] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a third time point; the third time point is later than the second time point and the first time point on the time axis;

[0129] Obtaining a second difference between a second detection value collected at a second time point and a second detection value collected at a third time point, wherein the second time point and the third time point are separated by a second preset time length;

[0130] determining the first detection value according to the second difference;

[0131] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure;

[0132] And / or, after determining the first detection value according to the first difference, the method further includes:

[0133] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a fourth time point and a second detection value collected at a fifth time point; at least one of the fourth time point and the fifth time point is later than the second time point and the first time point on the time axis;

[0134] Obtaining a third difference between the second detection value collected at the fourth time point and the second detection value collected at the fifth time point, wherein the fourth time point and the fifth time point are separated by a third preset time length;

[0135] Determining the first detection value according to the third difference;

[0136] When the absolute value of the first detection value is less than a first threshold, the light source module is controlled to start exposure.

[0137] In one embodiment, when the absolute value of the first detection value is greater than or equal to the first threshold value and less than the second threshold value, it indicates that the material to be cured in the trough has a large degree of flow and has not tended to be stationary, that is, the reflow has not been completed. At this time, starting from the second time point, after the second preset time length is delayed, the second detection value b3 collected by the detection device at the third time point is continued to be read, wherein the numerical range of the second preset time length can be 0.1s to 1s. The difference between the second detection value b3 and the second detection value b2 is calculated to obtain the second difference m2, and then the first detection value is re-determined according to the second difference m2. Then, the re-determined first detection value is compared with the first threshold value, and when the absolute value of the first detection value is less than the first threshold value, the light source module is controlled to start exposure. In other words, when the absolute value of the first detection value is greater than or equal to the first threshold value, a second detection value b3 is re-read, and the re-read second detection value b3 and the read second detection value b2 are used to determine the first detection value, thereby reducing the number of times the detection device is read as much as possible and reducing power consumption.

[0138] In another embodiment, when the absolute value of the first detection value is greater than or equal to the first threshold value and less than the second threshold value, the second detection value b4 collected by the detection device at the fourth time point is read, and after the delay of the third preset time length, the second detection value b5 collected by the detection device at the fifth time point is continued to be read, wherein the numerical range of the third preset time length can be 0.1s to 1s. The difference between the second detection value b5 and the second detection value b4 is calculated to obtain the third difference m3, and then the first detection value is re-determined according to the third difference m3. Then, the re-determined first detection value is compared with the first threshold value, and when the absolute value of the first detection value is less than the first threshold value, the light source module is controlled to start exposure. That is to say, when the absolute value of the first detection value is greater than or equal to the first threshold value, the two second detection values ​​b4 and the second detection value b5 are re-read, and the first detection value is determined by using the re-read second detection values ​​b4 and the second detection value b5, and the first detection value is determined by the two re-read second detection values, which can improve the accuracy of the determined first detection value.

[0139] Furthermore, in both of the above two embodiments, it is necessary to delay for a preset time before continuing to read the second detection value. By delaying the reading of the detection value, it can be ensured that the material to be solidified has a sufficiently long time to become stationary.

[0140] In one embodiment of the present application, the method further includes:

[0141] Record the total time the printing platform remains in the light-off state after it moves to the preset printing position;

[0142] When the total time is longer than a preset light-off time threshold, a second prompt message is issued, where the second prompt message is used to prompt that the detection device is abnormal or the working environment of the light-curing three-dimensional printing device is abnormal.

[0143] In some embodiments, the second prompt information is used to prompt that the detection device is abnormal, and records the total time after the printing platform moves to the preset printing position and remains in the light-off state. The total time indicates the time that the material to be cured is in a relatively large degree of fluidity. When the total time is greater than the preset light-off time threshold, it indicates that the material to be cured in the trough has not tended to be still for a long time. At this time, it may be that the detection device is abnormal, and a prompt of the detection device abnormality is issued to the user to remind the user to repair or replace the detection device in time to ensure smooth printing.

[0144] In some embodiments, the second prompt information is used to prompt that the working environment of the light-curing three-dimensional printing device is abnormal. When the total time that the printing platform moves to the preset printing position and remains in the light-off state is greater than the preset light-off time threshold, in addition to the possibility that the detection device is abnormal, there may also be problems with the flow of the material to be cured, such as the desktop where the light-curing three-dimensional printing device is placed continues to shake violently, etc. Therefore, the second prompt information can also be used to prompt that the flow of the material to be cured is abnormal, so as to remind the user to take corresponding measures in time to ensure smooth printing.

[0145] Of course, in some embodiments, the second prompt information may list prompts at the same time: it may be that the detection device is abnormal or it may be that the working environment of the light-curing three-dimensional printing device is abnormal, and the user is advised to perform corresponding operations to further determine the source of the abnormality.

[0146] In one embodiment of the present application, the method further includes:

[0147] Obtaining the viscosity of the material to be solidified;

[0148] The first threshold is determined according to the viscosity of the material to be solidified, and there is a positive correlation between the first threshold and the viscosity.

[0149] In this embodiment, the first threshold can be determined according to the viscosity of the material to be cured. Specifically, the greater the viscosity of the material to be cured, the smaller its flow rate of change, the greater the resin resistance, the greater the force detection value of the detection device, and thus the corresponding first threshold is set larger.

[0150] By using the above method, the first threshold is determined according to the viscosity of the material to be cured used during printing, so that the judgment of the fluidity of the material to be cured is more consistent with the actual printing scene, and the accuracy of the light-off time is further improved.

[0151] In one embodiment of the present application, the method further includes:

[0152] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the first threshold value according to the platform connection surface area, wherein the first threshold value is positively correlated with the platform connection surface area;

[0153] When the printing platform is printing other layers besides the first layer of the model, the layer area of ​​the previous layer of the current layer of the currently printed model is obtained, and the size of the first threshold is determined according to the layer area, and the size of the first threshold is positively correlated with the size of the layer area.

[0154] In this embodiment, the first threshold can be determined according to the platform connection surface area of ​​the printing platform or the layer area of ​​the printing model. Specifically, when the printing platform is in the first layer of the printing model, the first threshold is determined according to the platform connection surface area of ​​the printing platform used to connect the surface of the printing model; when the printing platform is in a layer other than the first layer of the printing model, the first threshold is determined according to the layer area of ​​the previous layer of the current printing model.

[0155] Since the larger the platform connection surface area of ​​the printing platform or the layer area of ​​the printed model, the greater the flow of the material to be solidified after the printing platform or the printed model it carries presses down the feed slot. Therefore, in order to accurately detect that the material to be solidified tends to be stationary, the first threshold needs to be set larger. Correspondingly, the smaller the platform connection surface area of ​​the printing platform or the layer area of ​​the printed model, the smaller the first threshold is set. In other words, the size of the first threshold is positively correlated with the size of the platform connection surface area of ​​the printing platform or the layer area of ​​the printed model.

[0156] In the above manner, the first threshold is determined according to the actual platform connection surface area of ​​the printing platform or the layer area of ​​the printed model, so that the judgment of the fluidity of the material to be cured is more in line with the actual printing scene, and the accuracy of the light-off time is further improved.

[0157] In one embodiment of the present application, the method further includes:

[0158] Obtaining the viscosity of the material to be solidified;

[0159] Determining a first coefficient according to the viscosity of the material to be solidified;

[0160] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the second coefficient according to the platform connection surface area;

[0161] When the printing platform is printing a layer other than the first layer of the model, obtaining a layer area of ​​a layer above the current layer of the currently printed model, and determining a third coefficient according to the layer area;

[0162] The first threshold is determined according to the first coefficient and the second coefficient; or the first threshold is determined according to the first coefficient and the third coefficient.

[0163] In this embodiment, the viscosity of the material to be solidified is acquired, and the first coefficient is determined based on the viscosity of the material to be solidified.

[0164] When the printing platform is printing the first layer of the model, the platform connection surface area of ​​the printing platform for connecting the surface of the printing model is obtained, and the second coefficient is determined based on the platform connection surface area, and the size of the first threshold is determined according to the first coefficient and the second coefficient, wherein the size of the first threshold is positively correlated with the size of the viscosity, and the size of the first threshold is positively correlated with the size of the platform connection surface area. The first coefficient represents the weight coefficient of the viscosity of the material to be solidified when the first threshold is determined by the viscosity of the material to be solidified and the platform connection surface area, and the second coefficient represents the weight coefficient of the platform connection surface area.

[0165] Alternatively, when the printing platform is printing other layers other than the first layer of the model, the layer area of ​​the previous layer of the current layer of the currently printed model is obtained, and the third coefficient is determined based on the layer area of ​​the previous layer, and the size of the first threshold is determined according to the first coefficient and the third coefficient, wherein the size of the first threshold is positively correlated with the size of the viscosity, and the size of the first threshold is positively correlated with the size of the layer area of ​​the previous layer. The first coefficient represents the weight coefficient of the viscosity of the material to be solidified when the first threshold is determined by the viscosity of the material to be solidified and the layer area of ​​the previous layer, and the third coefficient represents the weight coefficient of the layer area of ​​the previous layer.

[0166] In an embodiment of the present application, the first threshold is determined by the viscosity of the material to be cured, and the area of ​​the platform connection surface or the area of ​​the previous layer, so that the judgment of the fluidity of the material to be cured is more in line with the actual printing scenario, further improving the accuracy of the light-off time.

[0167] In one embodiment of the present application, before controlling the printing platform to move to a preset printing position, the method further includes:

[0168] reading the detection value of the detection device;

[0169] When the number of failures in reading the detection value of the detection device is greater than or equal to a preset number threshold, a third prompt message is issued, wherein the third prompt message is used to prompt that the detection device is abnormal;

[0170] After the third prompt information is sent, the method further includes:

[0171] Obtaining feedback information from the user based on the third prompt information;

[0172] When the feedback information is the first feedback information, re-reading the detection value of the detection device and resetting the number of failures in reading the detection value of the detection device;

[0173] When the feedback information is the second feedback information, a fourth prompt information is issued, and the fourth prompt information is used to prompt that the light-curing three-dimensional printing device is working abnormally.

[0174] In this embodiment, the detection device is first detected for abnormality before the light-off time is controlled. Specifically, an attempt is made to read the detection value of the detection device. If the detection value of the detection device is not read, the reading continues until the number of readings is greater than or equal to a preset number of times (for example, 10 times). The detection device is determined to be abnormal, and a third prompt message is issued to provide an abnormal prompt. The present application can detect abnormalities in the detection device and issue prompts in a timely manner to inform the user of abnormalities in the detection device.

[0175] In addition, the detection device is determined to be abnormal only when the detection value cannot be read for multiple times, thereby avoiding the problem of misjudgment in one judgment and improving the reliability of the judgment of abnormal conditions of the detection device.

[0176] In some embodiments, the third prompt information can be used to generally indicate that the photocuring 3D printing device is working abnormally, or to indicate that the detection device is damaged and it is recommended to replace the detection device, or to suggest contacting customer service for processing, or to suggest restarting the photocuring 3D printing device, without specific limitation here.

[0177] In one embodiment, after receiving the third prompt information, the user will learn that the detection device has an abnormality, and will take measures to replace the detection device, and provide information feedback on the replacement of the detection device through the interactive device of the light-curing three-dimensional printing device. After obtaining the user's feedback information, it is decided whether to continue to perform abnormality detection on the newly replaced detection device based on the user's feedback, thereby realizing interaction with the user and improving printing efficiency.

[0178] The present application also provides a light-curing three-dimensional printing device, such as Figure 2 As shown, the device includes:

[0179] Printing platform 201, used for connecting the printing model;

[0180] A material tank 202, used to contain the material to be cured;

[0181] The light source module 203 is used to project curing light to cure the material to be cured in the material tank 202 and connect it to the printing platform 201;

[0182] A memory (not shown in the figure), wherein the memory stores programs or instructions;

[0183] A processor (not shown in the figure) implements the various steps of the embodiment of the exposure control method of the light-curing three-dimensional printing device as described above when the processor executes the program or instruction, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0184] In one implementation of the present application, the device further includes:

[0185] A driving mechanism (not shown);

[0186] A vertical motion mechanism 204 connected to the driving mechanism;

[0187] A cantilever 205, wherein a first end of the cantilever 205 is connected to the printing platform 201, and a second end of the cantilever 205 is connected to the vertical motion mechanism 204;

[0188] The detection device 206 is arranged on the surface of the cantilever 205 corresponding to the opening position of the cantilever 205 , and the detection device 206 is used to detect the deformation amount of the cantilever 205 .

[0189] The first end of the cantilever 205 is used to install the printing platform 201, and the second end of the cantilever 205 is connected to the vertical movement mechanism 204. The vertical movement mechanism 204 can drive the cantilever 205 and the printing platform 201 to move relative to one side of the material trough 202 to print the model. The display screen 2031 of the light source module 203 is located on the other side of the material trough 202.

[0190] In one embodiment, the light source module 203 includes a display screen 2031 and a light source 2032. The light source 2032 is disposed on one side of the display screen 2031. The display screen 2031 is used to display a pattern of a specific contour. The light from the light source 2032 passes through the pattern and is projected onto the release film at the bottom of the material tank 202, so that the material to be cured between the printing platform 201 and the release film is cured and connected to the surface of the printing platform 201.

[0191] The detection device 206 can be a force detection device, a deformation detection device, etc., which can detect the deformation amount at a specific position of a specific component and other physical quantities that can express its force change, such as tension, gravity, pressure, torque, etc., and can specifically be some devices for detecting force change, such as elastic resistance strain gauges and tension sensors. In some embodiments, the detection device 206 is arranged on the cantilever 205, and can specifically be attached to the upper surface of the cantilever 205, and can detect the deformation amount of the cantilever 205, and the deformation of the cantilever 205 reflects the force of the printing platform 201. After the printing platform 201 is mounted on the cantilever 205, the printing platform 201 will pull the cantilever 205, causing the cantilever 205 to deform slightly, and when the printing platform receives a pulling force or a thrust, it will also affect the force of the cantilever 205. Therefore, the detection value of the detection device 206 also indirectly represents the force of the printing platform 201.

[0192] In some embodiments, the detection device 206 can be connected to a measuring circuit and a voltmeter. The detection device 206 and the measuring circuit form a Wheatstone bridge to obtain the output voltage of the voltmeter. The corresponding detection value, that is, the force value, can be calculated through the relationship between the output voltage and the force condition.

[0193] In the embodiment of the present application, the user does not need to set the light-off time of the light source module. Instead, the flow degree of the material to be cured in the material tank is judged based on the first detection value of the detection device, thereby automatically and accurately determining the light-off time, achieving accurate exposure of the light source module, and improving printing efficiency and printing effect.

[0194] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by a processor, the various steps of the embodiment of the exposure control method of the light-curing three-dimensional printing device as described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0195] The present application also provides the following embodiments:

[0196] Reference numeral 1, an embodiment of the present application provides an exposure control method for a light-curing 3D printing device, wherein the light-curing 3D printing device comprises a printing platform, a material tank, and a light source module, wherein the light source module is used to emit curing light to cure the material to be cured in the material tank and connect it to the printing platform, and the method comprises:

[0197] Controlling the printing platform to move to a preset printing position and keeping the light source module in an off state;

[0198] Acquire a first detection value for characterizing the fluidity of the material to be solidified in the material tank;

[0199] When the first detection value is within a preset detection value range, the light source module is controlled to start exposure.

[0200] Reference numeral 2, based on reference numeral 1, the light-curing three-dimensional printing device further includes a detection device, the detection device is used to detect a detection value that can reflect the fluidity of the material to be cured in the material tank to obtain a second detection value; the acquisition of the first detection value used to characterize the fluidity of the material to be cured in the material tank includes:

[0201] When the light source module maintains the light-off state, obtaining one or more second detection values;

[0202] The first detection value is determined based on one or more of the second detection values.

[0203] Label 3, based on label 2 or any of the above embodiments, the preset printing position is a position that is a preset distance away from the bottom of the material trough, and the preset distance corresponds to the layer thickness of the current printing layer of the current printing model, and the detection device is a force detection device, and the force detection device is used to detect the second detection value used to characterize the force of the printing platform and / or the material trough.

[0204] Reference numeral 4, based on reference numeral 2 or any of the above embodiments, determining the first detection value according to one or more second detection values ​​includes:

[0205] determining the first detection value according to changes of a plurality of the second detection values ​​along a time axis; or

[0206] The first detection value is determined according to a variance of a plurality of the second detection values ​​acquired within a continuous time period of a fourth preset time length.

[0207] Reference number 5, based on reference number 4 or any of the above embodiments, determining the first detection value according to one or more second detection values ​​includes: determining the first detection value according to changes of the plurality of second detection values ​​along the time axis; determining the first detection value according to changes of the plurality of second detection values ​​along the time axis includes:

[0208] Obtaining a first difference between a second detection value collected at a first time point and a second detection value collected at a second time point, wherein the first time point and the second time point are separated by a first preset time length;

[0209] The first detection value is determined according to the first difference.

[0210] Reference numeral 6, based on reference numeral 5 or any of the above embodiments, when the first detection value is within a preset detection value range, controlling the light source module to start exposure includes:

[0211] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure; or

[0212] When the first detection value is less than a first threshold value and greater than a third threshold value, the light source module is controlled to start exposure; the third threshold value is a negative number or 0, and the first threshold value is a positive number;

[0213] The method further comprises:

[0214] When the absolute value of the first detection value is greater than a second threshold, a first prompt message is issued, the first prompt message is used to prompt that the material to be solidified is abnormal, and the second threshold is greater than the first threshold.

[0215] Reference numeral 7, based on reference numeral 6 or any of the above embodiments, after determining the first detection value according to the first difference, the method further includes:

[0216] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a third time point; the third time point is later than the second time point and the first time point on the time axis;

[0217] Obtaining a second difference between a second detection value collected at a second time point and a second detection value collected at a third time point, wherein the second time point and the third time point are separated by a second preset time length;

[0218] determining the first detection value according to the second difference;

[0219] When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure;

[0220] And / or, after determining the first detection value according to the first difference, the method further includes:

[0221] When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a fourth time point and a second detection value collected at a fifth time point; at least one of the fourth time point and the fifth time point is later than the second time point and the first time point on the time axis;

[0222] Obtaining a third difference between the second detection value collected at the fourth time point and the second detection value collected at the fifth time point, wherein the fourth time point and the fifth time point are separated by a third preset time length;

[0223] Determining the first detection value according to the third difference;

[0224] When the absolute value of the first detection value is less than a first threshold, the light source module is controlled to start exposure.

[0225] Reference numeral 8, based on reference numeral 7 or any of the above embodiments, the method further comprises:

[0226] Record the total time the printing platform remains in the light-off state after it moves to the preset printing position;

[0227] When the total time is longer than a preset light-off time threshold, a second prompt message is issued, where the second prompt message is used to prompt that the detection device is abnormal or the working environment of the light-curing three-dimensional printing device is abnormal.

[0228] Reference number 9, based on reference number 6 or any of the above implementation modes, the method further includes:

[0229] Obtaining the viscosity of the material to be solidified;

[0230] The first threshold is determined according to the viscosity of the material to be solidified, and there is a positive correlation between the first threshold and the viscosity.

[0231] Reference number 10, based on reference number 6 or any of the above implementation modes, the method further includes:

[0232] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the first threshold value according to the platform connection surface area, wherein the first threshold value is positively correlated with the platform connection surface area;

[0233] When the printing platform is printing other layers besides the first layer of the model, the layer area of ​​the previous layer of the current layer of the currently printed model is obtained, and the size of the first threshold is determined according to the layer area, and the size of the first threshold is positively correlated with the size of the layer area.

[0234] Reference number 11, based on reference number 6 or any of the above implementation modes, the method further includes:

[0235] Obtaining the viscosity of the material to be solidified;

[0236] Determining a first coefficient according to the viscosity of the material to be solidified;

[0237] When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the second coefficient according to the platform connection surface area;

[0238] When the printing platform is printing a layer other than the first layer of the model, obtaining a layer area of ​​a layer above the current layer of the currently printed model, and determining a third coefficient according to the layer area;

[0239] The first threshold is determined according to the first coefficient and the second coefficient; or the first threshold is determined according to the first coefficient and the third coefficient.

[0240] Reference numeral 12, based on reference numeral 2 or any of the above embodiments, before controlling the printing platform to move to a preset printing position, the method further includes:

[0241] reading the detection value of the detection device;

[0242] When the number of failures in reading the detection value of the detection device is greater than or equal to a preset number threshold, a third prompt message is issued, wherein the third prompt message is used to prompt that the detection device is abnormal;

[0243] After the third prompt information is sent, the method further includes:

[0244] Obtaining feedback information from the user based on the third prompt information;

[0245] When the feedback information is the first feedback information, re-reading the detection value of the detection device and resetting the number of failures in reading the detection value of the detection device;

[0246] When the feedback information is the second feedback information, a fourth prompt information is issued, and the fourth prompt information is used to prompt that the light-curing three-dimensional printing device is working abnormally.

[0247] The present application also provides the following embodiments:

[0248] Reference numeral 13, an embodiment of the present application provides a light-curing three-dimensional printing device, comprising:

[0249] Printing platform, used to connect the printing model;

[0250] A material trough, used to contain the material to be cured;

[0251] A light source module, used for projecting curing light to cure the material to be cured in the material tank and connect it to the printing platform;

[0252] A memory storing programs or instructions;

[0253] A processor, wherein when executing the program or instruction, the processor implements the steps of the exposure control method of the photocuring three-dimensional printing device as described in any one of numbers 1 to 12.

[0254] Reference number 14, in addition to reference number 13, further includes:

[0255] Driving mechanism;

[0256] A vertical motion mechanism connected to the driving mechanism;

[0257] A cantilever, wherein a first end of the cantilever is connected to the printing platform, and a second end of the cantilever is connected to the vertical motion mechanism;

[0258] A detection device is arranged on the surface of the cantilever corresponding to the opening position of the cantilever, and the detection device is used to detect the deformation amount of the cantilever.

[0259] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An exposure control method for a light-curing 3D printing device, characterized in that: The light-curing 3D printing device comprises a printing platform, a material tank and a light source module, wherein the light source module is used to emit curing light to cure the material to be cured in the material tank and connect it to the printing platform, and the method comprises: Controlling the printing platform to move to a preset printing position and keeping the light source module in an off state; Acquire a first detection value for characterizing the fluidity of the material to be solidified in the material tank; When the first detection value is within a preset detection value range, the light source module is controlled to start exposure.

2. The method according to claim 1, characterized in that The light-curing three-dimensional printing device further includes a detection device, which is used to detect a detection value that can reflect the flow degree of the to-be-cured material in the material tank to obtain a second detection value; The obtaining of a first detection value for characterizing the fluidity of the material to be solidified in the material tank comprises: When the light source module maintains the light-off state, obtaining one or more second detection values; determining the first detection value according to one or more of the second detection values; The preset printing position is a position at a preset distance from the bottom of the material trough, the preset distance corresponds to the thickness of a current printing layer of the current printing model, and the detection device is a force detection device, and the force detection device is used to detect the second detection value used to characterize the force of the printing platform and / or the material trough; The determining the first detection value according to one or more of the second detection values ​​comprises: determining the first detection value according to changes of a plurality of the second detection values ​​along a time axis; or The first detection value is determined according to a variance of a plurality of the second detection values ​​acquired within a continuous time period of a fourth preset time length.

3. The method according to claim 2, characterized in that The determining the first detection value according to one or more of the second detection values ​​comprises: determining the first detection value according to changes of the plurality of the second detection values ​​along the time axis; the determining the first detection value according to changes of the plurality of the second detection values ​​along the time axis comprises: Obtaining a first difference between a second detection value collected at a first time point and a second detection value collected at a second time point, wherein the first time point and the second time point are separated by a first preset time length; determining the first detection value according to the first difference; When the first detection value is within a preset detection value range, controlling the light source module to start exposure includes: When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure; or When the first detection value is less than a first threshold value and greater than a third threshold value, the light source module is controlled to start exposure; the third threshold value is a negative number or 0, and the first threshold value is a positive number; The method further comprises: When the absolute value of the first detection value is greater than a second threshold, a first prompt message is issued, the first prompt message is used to prompt that the material to be solidified is abnormal, and the second threshold is greater than the first threshold.

4. The method according to claim 3, characterized in that After determining the first detection value according to the first difference, the method further includes: When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a third time point; the third time point is later than the second time point and the first time point on the time axis; Obtaining a second difference between a second detection value collected at a second time point and a second detection value collected at a third time point, wherein the second time point and the third time point are separated by a second preset time length; determining the first detection value according to the second difference; When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure; And / or, after determining the first detection value according to the first difference, the method further includes: When the absolute value of the first detection value is greater than or equal to the first threshold, waiting for and acquiring a second detection value collected at a fourth time point and a second detection value collected at a fifth time point; at least one of the fourth time point and the fifth time point is later than the second time point and the first time point on the time axis; Obtaining a third difference between the second detection value collected at the fourth time point and the second detection value collected at the fifth time point, wherein the fourth time point and the fifth time point are separated by a third preset time length; Determining the first detection value according to the third difference; When the absolute value of the first detection value is less than a first threshold, controlling the light source module to start exposure; The method further comprises: Record the total time the printing platform remains in the light-off state after it moves to the preset printing position; When the total time is longer than a preset light-off time threshold, a second prompt message is issued, where the second prompt message is used to prompt that the detection device is abnormal or the working environment of the light-curing three-dimensional printing device is abnormal.

5. The method according to claim 4, characterized in that The method further comprises: Obtaining the viscosity of the material to be solidified; Determining the first threshold value according to the viscosity of the material to be solidified, wherein the first threshold value is positively correlated with the viscosity; The method further comprises: When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the first threshold value according to the platform connection surface area, wherein the first threshold value is positively correlated with the platform connection surface area; When the printing platform is printing other layers besides the first layer of the model, the layer area of ​​the previous layer of the current layer of the currently printed model is obtained, and the size of the first threshold is determined according to the layer area, and the size of the first threshold is positively correlated with the size of the layer area.

6. The method according to claim 4, characterized in that The method further comprises: Obtaining the viscosity of the material to be solidified; Determining a first coefficient according to the viscosity of the material to be solidified; When the printing platform is printing the first layer of the model, obtaining the platform connection surface area of ​​the printing platform for connecting the surface of the printing model, and determining the second coefficient according to the platform connection surface area; When the printing platform is printing a layer other than the first layer of the model, obtaining a layer area of ​​a layer above the current layer of the currently printed model, and determining a third coefficient according to the layer area; The first threshold is determined according to the first coefficient and the second coefficient; or the first threshold is determined according to the first coefficient and the third coefficient.

7. The method according to any one of claims 2 to 6, characterized in that Before controlling the printing platform to move to the preset printing position, the method further includes: reading the detection value of the detection device; When the number of failures in reading the detection value of the detection device is greater than or equal to a preset number threshold, a third prompt message is issued, wherein the third prompt message is used to prompt that the detection device is abnormal; After the third prompt information is sent, the method further includes: Obtaining feedback information from the user based on the third prompt information; When the feedback information is the first feedback information, re-reading the detection value of the detection device and resetting the number of failures in reading the detection value of the detection device; When the feedback information is the second feedback information, a fourth prompt information is issued, and the fourth prompt information is used to prompt that the light-curing three-dimensional printing device is working abnormally.

8. A light-curing three-dimensional printing device, characterized in that: include: Printing platform, used to connect the printing model; A material trough, used to contain the material to be cured; A light source module, used for projecting curing light to cure the material to be cured in the material tank and connect it to the printing platform; A memory storing programs or instructions; A processor, wherein when executing the program or instruction, the processor implements the steps of the exposure control method of the light-curing three-dimensional printing device according to any one of claims 1 to 7.

9. The device according to claim 8, characterized in that Also includes: Driving mechanism; A vertical motion mechanism connected to the driving mechanism; A cantilever, wherein a first end of the cantilever is connected to the printing platform, and a second end of the cantilever is connected to the vertical motion mechanism; A detection device is arranged on the surface of the cantilever corresponding to the opening position of the cantilever, and the detection device is used to detect the deformation amount of the cantilever.

10. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by a processor, the steps of the exposure control method of a photo-curing 3D printing device according to any one of claims 1 to 7 are implemented.

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