Control method and equipment of photocuring 3D printing equipment and readable storage medium

Abstract

The invention provides a control method and equipment of photocuring 3D printing equipment and a readable storage medium, and relates to the field of 3D printing. The method comprises the steps that after a printing platform is controlled to move in the direction close to a light source, the light source is controlled to expose to cure a model; according to the exposure area of the model layer of the cured part of the model, a first speed is determined, the printing platform is controlled to move in the direction away from the light source at a second speed for release, and the second speed is smaller than or equal to the first speed; and / or, according to the exposure area of the model layer of the cured part of the model, a third speed is determined, and after release is completed, the printing platform is controlled to move towards the direction close to the light source at a fourth speed so that the next layer can be printed, and the fourth speed is smaller than or equal to the third speed. According to the embodiment of the invention, speed-limiting printing is realized, motor step loss, model fault or exposure screen damage caused by overlarge release force or downward pressure is avoided, and the printing success rate is improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and in particular to a control method for a photocuring 3D printing device, a photocuring 3D printing device, and a readable storage medium. Background Art

[0002] LCD (Laser cladding deposition) printing technology is a 3D printing technology that uses a liquid crystal display as a light source to solidify liquid photosensitive resin layer by layer. When using LCD printing technology for printing, 3D printers usually generate a greater release force and downward pressure when printing large-size models. Excessive release force or downward pressure may cause the motor to lose steps, model faults, or exposure screen damage. Summary of the invention

[0003] In view of this, the present application provides a control method for a photocuring 3D printing device, a photocuring 3D printing device and a readable storage medium, which realize speed-limited printing, avoid the generation of excessive release force or excessive downward pressure that may cause the motor to lose steps, model faults or exposure screen damage, and improve the printing success rate.

[0004] In a first aspect, an embodiment of the present application provides a control method for a light-curing 3D printing device, wherein the light-curing 3D printing device includes a printing platform and a light source; the method includes:

[0005] After controlling the printing platform to move toward the direction close to the light source, controlling the light source to expose to solidify the model;

[0006] A first speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and the printing platform is controlled to move at a second speed in a direction away from the light source for mold release, wherein the second speed is less than or equal to the first speed; and / or a third speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and after mold release is completed, the printing platform is controlled to move at a fourth speed in a direction close to the light source for printing a next layer, wherein the fourth speed is less than or equal to the third speed.

[0007] In a second aspect, an embodiment of the present application provides a photocuring 3D printing device, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the method of the first aspect are implemented.

[0008] In a third aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method of the first aspect are implemented.

[0009] In an embodiment of the present application, the speed of movement of the printing platform during release and / or pressing down is determined based on the exposure area of ​​the model layer of the solidified part of the model, so that release lifting and / or pressing down reset are performed, thereby achieving speed-limited printing, avoiding the generation of excessive release force and downward force that may cause the motor to lose steps, the model to break, or the exposure screen to be damaged, thereby improving the printing success rate.

[0010] 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

[0011] 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:

[0012] Figure 1 One of the flow charts of a control method of a light-curing 3D printing device according to a certain embodiment of the present application is shown;

[0013] Figure 2 A second flow chart of a control method of a light-curing 3D printing device according to an embodiment of the present application is shown;

[0014] Figure 3 A structural block diagram of a light-curing 3D printing device according to an embodiment of the present application is shown.

[0015] Figure 4 A schematic diagram of the structure of a material tank of a light-curing 3D printing device according to a certain embodiment of the present application is shown. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] In conjunction with the accompanying drawings, the control method of the light-curing 3D printing device, the light-curing 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.

[0019] The present application embodiment provides a control method for a light-curing 3D printing device, wherein the light-curing 3D printing device includes a printing platform and a light source. Figure 1 As shown, the method includes:

[0020] S101, after controlling the printing platform to move toward a direction close to the light source, controlling the light source to expose to solidify the model.

[0021] In this step, the printing platform is controlled to move toward the direction close to the light source, and after reaching the curing position, the light source is controlled to expose, thereby forming a cured model on the printing platform.

[0022] S102, determining a first speed according to an exposure area of ​​a model layer of a solidified portion of the model, and controlling the printing platform to move at a second speed in a direction away from the light source for mold release, wherein the second speed is less than or equal to the first speed; and / or determining a third speed according to an exposure area of ​​a model layer of a solidified portion of the model, and after mold release is completed, controlling the printing platform to move at a fourth speed in a direction close to the light source for printing a next layer, wherein the fourth speed is less than or equal to the third speed.

[0023] In this step, the photocuring printing of a model layer includes two moving stages: the release and lifting stage and the downward pressure reset stage. The release and lifting stage refers to the movement process of the printing platform moving in the direction away from the light source, and the downward pressure reset stage refers to the movement process of the printing platform moving in the direction close to the light source. The release and lifting stage generates a release force, and the downward pressure is generated in the downward pressure reset stage. Excessive release force and downward pressure may cause the motor to lose steps, model faults, or exposure screen damage. In order to avoid this problem, the moving speed of the printing platform is limited in the release and lifting stage and / or the downward pressure reset stage to avoid excessive release force and / or downward pressure.

[0024] According to the exposure area of ​​the model layer of the solidified part of the model, the first speed is determined, the first speed is the upper limit of the speed of the printing platform in the release and lifting stage, and the printing platform is controlled to move in the direction away from the light source at a second speed less than or equal to the first speed to release the model layer, thereby realizing the speed limit control in the release and lifting stage. And / or, according to the exposure area of ​​the model layer of the solidified part of the model, the third speed is determined, the third speed is the upper limit of the speed of the printing platform in the pressing and resetting stage, and the printing platform is controlled to move in the direction close to the light source at a fourth speed less than or equal to the third speed to print the next model layer, thereby realizing the speed limit control in the pressing and resetting stage.

[0025] It should be noted that when printing the first model layer, the printing platform can move in the direction close to the light source at a set moving speed, where the set moving speed is the printing platform moving speed of the device model, or the printing platform moving speed set by default in the slice file. The fifth speed can also be determined according to a preset ratio of the maximum exposure area of ​​the light-curing 3D printing device, and then the printing platform is controlled to move in the direction close to the light source at a sixth speed, and the sixth speed is less than or equal to the fifth speed. The preset ratio can be determined according to the type of light-curing 3D printing device and the weight of the printing platform. For example, the fifth speed can be determined based on 30% of the maximum exposure area.

[0026] In the embodiment of the present application, the speed of movement of the printing platform during release and / or pressing down is determined based on the exposure area of ​​the model layer of the solidified part of the model, so as to perform release lifting and / or pressing down reset, thereby realizing speed-limited printing, avoiding the generation of excessive release force or excessive downward pressure that may cause the motor to lose steps, the model to break, or the exposure screen to be damaged, thereby improving the printing success rate.

[0027] In one embodiment of the present application, the printing platform moves in a direction away from the light source as a release lifting stage, and the printing platform is controlled to move in a direction away from the light source at a second speed to release the mold, including:

[0028] During the entire release and lifting stage, or in the initial stage of the release and lifting stage, the printing platform is controlled based on the second speed;

[0029] The printing platform moves toward the direction close to the light source to print the next layer as the downward pressure reset stage, and the printing platform is controlled to move toward the direction close to the light source at a fourth speed to print the next layer, including:

[0030] During the entire pressing-down resetting stage, or at the end of the pressing-down resetting stage, the printing platform is controlled to perform the pressing-down resetting action based on the upper limit value of the pressing-down speed.

[0031] In this embodiment, during the release and lifting stage and / or the downward pressure reset stage, the moving speed of the printing platform is determined according to the exposure area of ​​the model layer of the solidified part of the model, so as to avoid excessive speed during the release and lifting and / or downward pressure reset, thereby avoiding the generation of excessive release force and downward pressure, and ensuring successful printing.

[0032] In one embodiment, the printing platform can be moved at a limited speed based on the exposure area of ​​the model layer of the solidified part of the model in the initial stage of the release and lifting stage, wherein the initial stage can be a preset distance or a preset duration for starting release; and the printing platform can be moved at a limited speed based on the exposure area of ​​the model layer of the solidified part of the model in the final stage of the pressing and resetting stage, wherein the final stage can be a preset distance or a preset duration for the end of pressing. In this way, the motor is prevented from losing steps due to excessive movement speed in the release and lifting stage and the pressing and resetting stage, and the problem of model faults caused by excessive release force in the initial stage of release and lifting can be avoided, and the problem of exposure screen damage caused by excessive downward pressure in the final stage of pressing and resetting can be avoided.

[0033] In another embodiment, the speed of the printing platform can be limited based on the exposure area of ​​the model layer of the solidified part of the model during the entire release and lifting stage or the entire downward pressing and resetting stage. This can not only avoid the problems of motor step loss, model fault or exposure screen damage, but also avoid the segmented speed control affecting the stability and accuracy of the data measured by the force sensor of the light-curing 3D printing equipment.

[0034] In one embodiment of the present application, the second speed and / or the fourth speed is a constant speed or a variable speed;

[0035] When the second speed and / or the fourth speed is a variable speed, the second speed and / or the fourth speed is a uniform acceleration, a uniform deceleration or a segmented speed.

[0036] In this embodiment, the movement speed of the printing platform for release lifting and / or downward pressing can be a constant speed. By moving at a uniform speed limit, excessive release force and / or downward pressure can be avoided. At the same time, the stable speed can avoid affecting the data measured by the force sensor of the light-curing 3D printing device.

[0037] The moving speed of the printing platform for release lifting and / or downward pressure reset can also be a variable speed, for example, it can be uniform acceleration, uniform deceleration or segmented speed. For example, in the initial section of release lifting, it moves at a lower speed to avoid excessive release force, and in the final section of release lifting, it moves at a slightly higher speed, thereby improving the release efficiency; for another example, in the initial section of downward pressure reset, it moves at a uniform acceleration, and in the final section of downward pressure reset, it moves at a uniform deceleration, thereby avoiding excessive downward force and improving the efficiency of downward pressure reset. The movement of the printing platform can also be controlled by setting different speed segments. For example, the movement process of release lifting or downward pressure reset is divided into three speed stages, the speed of the first speed stage is v1, the speed of the second speed stage is v2, and the speed of the third speed stage is v3, and v1 and v3 are both less than v2. Therefore, by setting multiple speed gradients, it is convenient to simplify speed control, save computing resources, ensure stable operation and ensure control accuracy.

[0038] In one embodiment of the present application, determining the first speed according to the exposure area of ​​the model layer of the solidified part of the model includes: determining the first speed according to the exposure area of ​​the most recently solidified model layer in the solidified part of the model;

[0039] The third speed is determined according to the exposure area of ​​the model layer of the solidified part of the model, including:

[0040] The third speed is determined according to an exposure area of ​​one or more model layers printed before a newly solidified model layer in a solidified portion of the model; wherein the one or more model layers include: one or more model layers adjacent to the newly solidified model layer, or one or more model layers spaced from the newly solidified model layer by one or more layers, or one or more model layers having an exposure area greater than that of the newly solidified model layer.

[0041] In this embodiment, during the release and lifting stage, only the adhesion force of the release film generates lifting resistance, so the effect of the exposure area of ​​the most recently solidified model layer in the solidified part on the release force only needs to be considered, that is, the first speed is determined according to the exposure area of ​​the most recently solidified model layer, and during the release and lifting, the printing platform is controlled to be released and lifted at a speed less than the first speed, to ensure that the release force is reduced.

[0042] In the downward pressure reset stage, the third speed can be determined according to the exposure area of ​​a model layer printed before the latest solidified model layer, and the printing platform is controlled to be pressed down and reset at a speed less than the third speed during the downward pressure reset to ensure that the downward pressure is reduced. In addition, the generation of downward pressure is affected by the layer thickness and the viscosity of the resin. Therefore, when the downward pressure is reset, the third speed can be determined according to the exposure area of ​​multiple model layers printed before the latest solidified model layer, and the printing platform is controlled to be pressed down and reset at a speed less than the third speed during the downward pressure reset to ensure that the downward pressure is reduced.

[0043] When the third speed is determined according to the exposure area of ​​a model layer printed before the most recently solidified model layer, the model layer may be the previous layer adjacent to the most recently solidified model layer, or may be a model layer separated from the most recently solidified model layer by one layer, or may be a model layer separated from the most recently solidified model layer by more than one layer, or may be any model layer with an exposure area larger than the most recently solidified model layer during the printing process before the most recently solidified model layer.

[0044] When the third speed is determined based on the exposure areas of multiple model layers printed before the most recently solidified model layer, the multiple model layers may be multiple model layers adjacent to the most recently solidified model layer, or may be multiple model layers separated by one or more layers, or may be multiple model layers having an exposure area larger than the most recently solidified model layer during the printing process before the most recently solidified model layer.

[0045] Through the above-mentioned method, the exposure area of ​​one or more adjacent or spaced model layers printed before the latest solidified model layer can be combined to achieve speed limit control of the downward pressure reset process of the printing platform to avoid excessive downward pressure. It can be understood that among the model layers printed before the latest solidified model layer, the model layer with an exposure area larger than the exposure area of ​​the latest solidified model layer has a greater impact on the downward pressure. Therefore, controlling the moving speed based on the exposure area of ​​the model layer larger than the exposure area of ​​the latest solidified model layer has a better effect on reducing the downward pressure.

[0046] In one embodiment of the present application, determining the third speed according to the exposure areas of multiple model layers printed before the most recently cured model layer in the cured part of the model includes:

[0047] According to the layer thickness of the model layer, a preset number of model layers to be printed before the latest solidified model layer is determined, the preset number is greater than 1, and the layer thickness of the model layer is negatively correlated with the preset number;

[0048] The third speed is determined according to the exposure areas of a preset number of model layers.

[0049] In this embodiment, the thinner the model layer thickness is, the more model layers will have an impact on the release force or the downward pressure. Therefore, different numbers of model layer exposure areas can be introduced according to different model layer thicknesses, so as to control the moving speed to improve the effect of reducing the release force and the downward pressure. The model layer thickness is negatively correlated with the number of model layers introduced. For example, when printing with a layer thickness of 0.01 mm, the exposure areas of the first 10 model layers are introduced into the judgment, and when printing with a layer thickness of 0.02 mm, the exposure areas of the first 5 model layers are introduced into the judgment.

[0050] In one embodiment of the present application, determining the third speed according to the exposure areas of multiple model layers printed before the most recently cured model layer in the cured part of the model includes:

[0051] determining the third speed according to the maximum value of the exposure areas of the plurality of model layers printed before the most recently solidified model layer; or,

[0052] The third speed is determined according to the mode, average or weighted average of exposure areas of multiple model layers printed before the most recently solidified model layer; wherein, when the third speed is determined according to the weighted average of exposure areas of multiple model layers, the closer the model layer is to the most recently solidified model layer, the greater the corresponding weight coefficient.

[0053] In this embodiment, when the moving speed is controlled based on the exposure areas of the multiple model layers printed before the latest solidified model layer, since the model layer with the largest exposure area among the multiple model layers has the greatest influence on the downward force, the maximum value of the exposure areas among the multiple model layers can be used as the basis for speed determination to ensure the accuracy of downward force control. For example, when the exposure areas of the first 10 model layers are introduced into the judgment, the third speed is determined according to the maximum value of the exposure areas among the 10 model layers.

[0054] The mode, average or weighted average of the exposure areas of multiple model layers can also be used as the basis for determining the speed. The mode, average or weighted average of the exposure areas of multiple model layers can reflect the influence of the solidified model on the release force and down force of the current print. Therefore, the speed can be determined according to the mode, average or weighted average, thereby controlling the release force or down force. It can be understood that when calculating the weighted average, the closer the model layer is to the most recently solidified model layer, the larger its corresponding weight coefficient, thereby making the mobile speed limit control more in line with the actual printing conditions.

[0055] In an embodiment of the present application, the upper speed limit value may be determined by the largest exposure area among multiple model layers or the mode, average value, or weighted average value of the exposure areas of multiple model layers to ensure the accuracy of the determined upper speed limit value and avoid excessive release force or downward pressure.

[0056] In one embodiment of the present application, the first speed and / or the third speed is negatively correlated with the exposure area of ​​the model layer of the cured portion of the model.

[0057] In this embodiment, the first speed and / or the third speed, i.e., the upper speed limit of the release lifting and / or downward pressing resetting process, is negatively correlated with the exposure area of ​​the model layer of the solidified part of the model. It can be understood that the larger the exposure area of ​​the model layer of the solidified part of the model, the smaller the upper speed limit, thereby controlling the moving speed of the printing platform to be smaller, avoiding the generation of excessive release force or downward pressure, and ensuring the printing success rate.

[0058] In one embodiment of the present application, the exposure area of ​​the model layer of the cured part of the model determines the first speed and / or the third speed, including:

[0059] Determine the ratio of the exposure area of ​​the model layer of the solidified part of the model to the maximum exposure area of ​​the 3D printing device, and determine the allowable speed threshold corresponding to the target ratio range in which the ratio falls;

[0060] The first speed and / or the third speed is determined according to the set moving speed and the allowed speed threshold.

[0061] In this embodiment, different allowable speed thresholds are set according to different exposure area proportions, wherein different exposure area proportion ranges correspond to different allowable speed thresholds. For example, when the proportion range is greater than or equal to 30%, the corresponding allowable speed threshold is 1mm / s; when the proportion range is greater than or equal to 20 and less than 30%, the corresponding allowable speed threshold is 3mm / s; when the proportion range is greater than or equal to 10 and less than 20%, the corresponding allowable speed threshold is 10mm / s; when the proportion range is less than 10%, the corresponding allowable speed threshold is 15mm / s. It should be noted that for the two different moving stages of release lifting and downward pressing and resetting, the upper and lower limits of the corresponding proportion ranges may be the same or different, and the allowable speed thresholds corresponding to different proportion ranges may be the same or different.

[0062] Calculate the exposure area ratio of the model layer of the solidified part of the model relative to the maximum exposure area of ​​the 3D printing device, determine the target ratio range in which the ratio is located, and thus determine the allowable speed threshold corresponding to the target ratio range. For example, if the exposure area ratio of the model layer of the solidified part of the model is 40% relative to the maximum exposure area of ​​the 3D printing device, then the allowable speed threshold corresponding to the target ratio range of the ratio is 1mm / s. Then, according to the set movement speed and the allowable speed threshold, determine the first speed and / or the third speed, wherein the set movement speed is the printing platform movement speed of the device model, or the printing platform movement speed set by default in the slicing file.

[0063] In the embodiment of the present application, different allowable speed thresholds are set according to the exposure area of ​​the model layer of the solidified part of the model, and then different moving speeds are set, so as to reduce the pulling force on the model layer during the release process and reduce the impact force on the exposure screen during the pressing process, thereby reducing the risk of model deformation and breakage or exposure screen damage.

[0064] In one embodiment of the present application, determining the first speed and / or the third speed according to the set moving speed and the allowed speed threshold includes:

[0065] If the set moving speed of the printing platform is less than the allowed speed threshold, the set moving speed is used as the first speed and / or the third speed; or,

[0066] If the set moving speed of the printing platform is greater than or equal to the allowed speed threshold, the allowed speed threshold is used as the first speed and / or the third speed.

[0067] In this embodiment, after determining the corresponding allowable speed threshold according to the exposure area of ​​the model layer of the solidified part of the model, the set moving speed of the printing platform is compared with the allowable speed threshold, and the speed upper limit is determined according to the comparison result.

[0068] If the set moving speed of the printing platform is less than the allowed speed threshold, the set moving speed is set as the speed upper limit value, and if the set moving speed of the printing platform is greater than or equal to the allowed speed threshold, the allowed speed threshold is set as the speed upper limit value. Thus, when the printing platform is subsequently controlled to move, the moving speed of the printing platform is limited to be less than or equal to the speed upper limit value.

[0069] For example, Figure 2 As shown, start the release, obtain the set moving speed of the printing platform and the exposure area of ​​the model layer of the solidified part of the model, and calculate the exposure area of ​​the model layer of the solidified part of the model relative to the maximum exposure area of ​​the 3D printing device. Determine whether the proportion is less than 30%. If the proportion is greater than or equal to 30%, the corresponding allowable speed threshold is 1mm / s, and determine whether the set moving speed is less than 1mm / s. If it is less than, the upper limit of the release speed is set to the set moving speed. If it is not less than, the upper limit of the release speed is set to 1mm / s. Then control the release lift according to the upper limit of the release speed.

[0070] If the proportion is less than 30%, it is determined whether the proportion is less than 20%. If the proportion is greater than or equal to 20%, the corresponding allowable speed threshold is 3mm / s, and it is determined whether the set moving speed is less than 3mm / s. If it is less than, the upper limit of the speed of separation is set to the set moving speed. If it is not less than, the upper limit of the speed of separation is set to 3mm / s. Then the separation lifting is controlled according to the upper limit of the speed of separation.

[0071] If the proportion is less than 20%, it is determined whether the proportion is less than 10%. If the proportion is greater than or equal to 10%, the corresponding allowable speed threshold is 10mm / s, and it is determined whether the set moving speed is less than 10mm / s. If it is less than, the upper limit of the speed of separation is set to the set moving speed. If it is not less than, the upper limit of the speed of separation is set to 10mm / s. Then the separation lifting is controlled according to the upper limit of the speed of separation.

[0072] If the proportion is less than 10%, the corresponding allowable speed threshold is 15mm / s, and it is determined whether the set moving speed is less than 15mm / s. If it is less than, the upper limit of the speed of separation is set to the set moving speed. If it is not less than, the upper limit of the speed of separation is set to 15mm / s. Then, the separation lifting is controlled according to the upper limit of the speed of separation.

[0073] The embodiments of the present application can flexibly control the moving speed based on the exposure area of ​​the model layer, avoid generating excessive release force or downward pressure, and reduce the risk of model deformation and breakage or exposure screen damage.

[0074] In one embodiment of the present application, the method further includes: obtaining a set acceleration of the printing platform, and determining an allowable speed threshold corresponding to different proportion ranges according to the set acceleration, wherein the allowable speed threshold corresponding to any proportion range is negatively correlated with the set acceleration.

[0075] In this embodiment, the allowable speed thresholds corresponding to different proportion ranges are determined according to the set acceleration of the printing platform, and the allowable speed thresholds corresponding to different proportion ranges are negatively correlated with the set acceleration. For example, when the acceleration is 20mm / s2, the allowable speed threshold corresponding to a proportion range of less than 30% is 1mm / s; when the acceleration is 30mm / s2, the allowable speed threshold corresponding to a proportion range of less than 30% is 0.6mm / s.

[0076] Because the greater the acceleration, the more drastic the speed change, the greater the impact, the greater the risk of damage to the exposure screen and the risk of deformation and fracture of the model. At this time, the speed limit needs to be more stringent to ensure safe and high success rate printing.

[0077] In one embodiment of the present application, the method further includes:

[0078] In response to the model printing instruction, if the speed control mode is determined to be the speed limit control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the exposure area of ​​the model layer of the solidified part of the model; or,

[0079] In response to the model printing instruction, if the speed control mode is determined to be the non-speed-limited control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the set moving speed.

[0080] In this embodiment, the user can set whether to implement a scheme for speed control of the printing platform during the process of lifting and pressing down to reset the printing platform. When the user issues a model printing instruction, the model printing instruction carries information about the speed control mode. If the user chooses to turn on the speed control mode, the scheme for speed control of the printing platform during the process of lifting and pressing down to reset the printing platform is implemented, that is, the moving speed of the printing platform is controlled according to the exposure area of ​​the model layer of the solidified part of the model; if the user chooses to turn off the speed control mode or selects the non-speed control mode or does not select the speed control mode, the non-speed control mode is used, that is, the scheme for speed control of the printing platform during the process of lifting and pressing down to reset the printing platform is not implemented, but the moving speed of the printing platform toward or away from the light source is controlled according to the set moving speed.

[0081] The embodiments of the present application can support users to flexibly select speed limit control to meet actual printing needs.

[0082] The light curing device of the present application may include a material tank. The material tank may be a common material tank or a material tank such as Figure 4 The heating trough 400 is shown. The heating trough 400 includes a trough body 401 and a temperature sensing probe 402 installed on the inner wall of the trough body 401. The temperature sensing probe 402 is embedded in the middle and lower part of the inner wall of the trough body 401. The trough body 401 is also equipped with an annular heating belt, which heats the resin in the trough. When the temperature sensing probe 402 detects that the resin temperature reaches the first set temperature, the heating stops. When the temperature sensing probe 402 detects that the resin temperature is lower than the second set temperature, the heating starts. The first set temperature is greater than or equal to the second set temperature.

[0083] In some specific embodiments, the photocuring device of the present application may include an automatic feeding component, the automatic feeding component may include a first residual detection probe for detecting the resin residual in the material tank, and the automatic feeding component may also include a second residual detection probe and a third residual detection probe for detecting the resin residual in the storage container, the storage container is used to store the resin and provide the resin to the material tank through the automatic feeding component. When the first residual detection probe is in a working state, the signals of the second residual detection probe and the third residual detection probe are shielded by means of potential pull-down, etc., so as to avoid signal crosstalk; when the second residual detection probe is in a working state, the signals of the first residual detection probe and the third residual detection probe are shielded by means of potential pull-down, etc., so as to avoid signal crosstalk; when the third residual detection probe is in a working state, the signals of the first residual detection probe and the second residual detection probe are shielded by means of potential pull-down, etc., so as to avoid signal crosstalk. The first residual detection probe, the second residual detection probe, and the third residual detection probe can respectively measure the signal of the measured part of the probe by means of resistance voltage division to determine the resin residual.

[0084] The present application also provides a light-curing 3D printing device, such as Figure 3 As shown, the photocuring 3D printing device 300 includes a processor 301 and a memory 302. The memory 302 stores a program or instruction that can be run on the processor 301. When the program or instruction is executed by the processor 301, each step of the control method embodiment of the above-mentioned photocuring 3D printing device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0085] The memory 302 can be used to store software programs and various data. The memory 302 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 302 may include a volatile memory or a non-volatile memory, or the memory 302 may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 302 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0086] The processor 301 may include one or more processing units; optionally, the processor 301 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 301.

[0087] The embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the control method embodiment of the above-mentioned light-curing 3D printing device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0088] The present application also provides the following embodiments:

[0089] Embodiment 1, a control method of a light-curing 3D printing device, the light-curing 3D printing device comprising a printing platform and a light source; the method comprising:

[0090] After controlling the printing platform to move toward the direction close to the light source, controlling the light source to expose to solidify the model;

[0091] A first speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and the printing platform is controlled to move at a second speed in a direction away from the light source for mold release, wherein the second speed is less than or equal to the first speed; and / or a third speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and after mold release is completed, the printing platform is controlled to move at a fourth speed in a direction close to the light source for printing a next layer, wherein the fourth speed is less than or equal to the third speed.

[0092] Embodiment 2, based on Embodiment 1, the movement of the printing platform in a direction away from the light source is a release lifting stage, and the control of the printing platform to move in a direction away from the light source at a second speed for release comprises:

[0093] During the entire release and lifting stage, or in an initial stage of the release and lifting stage, controlling the printing platform based on the second speed;

[0094] The printing platform moves toward the direction close to the light source to print the next layer as a downward pressure reset stage, and the printing platform is controlled to move toward the direction close to the light source at a fourth speed so as to print the next layer, including:

[0095] During the entire pressing-down resetting stage, or at the end of the pressing-down resetting stage, the printing platform is controlled to perform a pressing-down resetting action based on the pressing-down speed upper limit.

[0096] Embodiment 3, based on embodiment 1, the second speed and / or the fourth speed is a constant speed or a variable speed;

[0097] When the second speed and / or the fourth speed is a variable speed, the second speed and / or the fourth speed is a uniform acceleration, a uniform deceleration or a segmented speed.

[0098] Embodiment 4, based on embodiment 1, determining the first speed according to the exposure area of ​​the model layer of the solidified part of the model comprises:

[0099] Determining the first speed according to an exposure area of ​​a newly solidified model layer in a solidified portion of the model;

[0100] The step of determining the third speed according to the exposure area of ​​the model layer of the solidified part of the model comprises:

[0101] The third speed is determined according to an exposure area of ​​one or more model layers printed before a newly solidified model layer in a solidified portion of the model; wherein the one or more model layers include: one or more model layers adjacent to the newly solidified model layer, or one or more model layers spaced from the newly solidified model layer by one or more layers, or one or more model layers having an exposure area greater than that of the newly solidified model layer.

[0102] Embodiment 5, based on embodiment 4, the third speed is determined according to the exposure area of ​​multiple model layers printed before the latest cured model layer in the cured part of the model, including:

[0103] Determining a preset number of model layers to be printed before a newly solidified model layer according to the layer thickness of the model layer, wherein the preset number is greater than 1, and the layer thickness of the model layer is negatively correlated with the preset number;

[0104] The third speed is determined according to the exposure areas of the preset number of model layers.

[0105] Embodiment 6, based on embodiment 4, the third speed is determined according to the exposure area of ​​multiple model layers printed before the latest cured model layer in the cured part of the model, including:

[0106] determining the third speed according to a maximum value of exposure areas of a plurality of model layers printed before the most recently solidified model layer; or,

[0107] The third speed is determined according to the mode, average or weighted average of exposure areas of multiple model layers printed before the most recently solidified model layer; wherein, when the third speed is determined according to the weighted average of exposure areas of multiple model layers, the closer the model layer is to the most recently solidified model layer, the greater the corresponding weight coefficient.

[0108] Embodiment 7, based on embodiment 1, the first speed and / or the third speed is negatively correlated with the exposure area of ​​the model layer of the solidified part of the model.

[0109] Embodiment 8, based on embodiment 1, the exposure area of ​​the model layer of the solidified part of the model determines the first speed and / or the third speed, comprising:

[0110] Determine the ratio of the exposure area of ​​the model layer of the solidified part of the model to the maximum exposure area of ​​the 3D printing device, and determine the allowable speed threshold corresponding to the target ratio range in which the ratio is located;

[0111] The first speed and / or the third speed is determined according to the set moving speed and the allowable speed threshold.

[0112] Embodiment 9, based on embodiment 8, determining the first speed and / or the third speed according to the set moving speed and the allowed speed threshold includes:

[0113] If the set moving speed of the printing platform is less than the allowable speed threshold, the set moving speed is used as the first speed and / or the third speed; or,

[0114] If the set moving speed of the printing platform is greater than or equal to the allowable speed threshold, the allowable speed threshold is used as the first speed and / or the third speed.

[0115] Embodiment 10, based on embodiment 8, the method further comprises:

[0116] The set acceleration of the printing platform is obtained, and the allowable speed thresholds corresponding to different proportion ranges are determined according to the set acceleration, and the allowable speed threshold corresponding to any proportion range is negatively correlated with the set acceleration.

[0117] Embodiment 11, based on any one of Embodiments 1 to 10, the method further comprises:

[0118] In response to a model printing instruction, if the speed control mode is determined to be a speed limit control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the exposure area of ​​the model layer of the solidified part of the model; or,

[0119] In response to the model printing instruction, if the speed control mode is determined to be the non-speed-limited control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the set moving speed.

[0120] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0121] 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. A control method for a light-curing 3D printing device, characterized in that: The light-curing 3D printing device comprises a printing platform and a light source; the method comprises: After controlling the printing platform to move toward the direction close to the light source, controlling the light source to expose to solidify the model; A first speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and the printing platform is controlled to move at a second speed in a direction away from the light source for mold release, wherein the second speed is less than or equal to the first speed; and / or a third speed is determined according to an exposure area of ​​a model layer of a solidified portion of the model, and after mold release is completed, the printing platform is controlled to move at a fourth speed in a direction close to the light source for printing a next layer, wherein the fourth speed is less than or equal to the third speed.

2. The method according to claim 1, characterized in that The printing platform moves in a direction away from the light source as a release lifting stage, and the step of controlling the printing platform to move in a direction away from the light source at a second speed for release comprises: During the entire release and lifting stage, or in an initial stage of the release and lifting stage, controlling the printing platform based on the second speed; The printing platform moves toward the direction close to the light source to print the next layer as a downward pressure reset stage, and the printing platform is controlled to move toward the direction close to the light source at a fourth speed so as to print the next layer, including: During the entire pressing-down resetting stage, or at the end of the pressing-down resetting stage, the printing platform is controlled to perform a pressing-down resetting action based on the pressing-down speed upper limit.

3. The method according to claim 1, characterized in that The second speed and / or the fourth speed is a constant speed or a variable speed; When the second speed and / or the fourth speed is a variable speed, the second speed and / or the fourth speed is a uniform acceleration, a uniform deceleration or a segmented speed.

4. The method according to claim 1, characterized in that: The step of determining the first speed according to the exposure area of ​​the model layer of the solidified part of the model comprises: Determining the first speed according to an exposure area of ​​a newly solidified model layer in a solidified portion of the model; The step of determining the third speed according to the exposure area of ​​the model layer of the solidified part of the model comprises: The third speed is determined according to an exposure area of ​​one or more model layers printed before a newly solidified model layer in a solidified portion of the model; wherein the one or more model layers include: one or more model layers adjacent to the newly solidified model layer, or one or more model layers spaced from the newly solidified model layer by one or more layers, or one or more model layers having an exposure area greater than that of the newly solidified model layer.

5. The method according to claim 4, characterized in that The determining the third speed according to the exposure areas of the plurality of model layers printed before the most recently cured model layer in the cured part of the model comprises: Determining a preset number of model layers to be printed before a newly solidified model layer according to the layer thickness of the model layer, wherein the preset number is greater than 1, and the layer thickness of the model layer is negatively correlated with the preset number; The third speed is determined according to the exposure areas of the preset number of model layers.

6. The method according to claim 4, characterized in that The determining the third speed according to the exposure areas of the plurality of model layers printed before the most recently cured model layer in the cured part of the model comprises: determining the third speed according to a maximum value of exposure areas of a plurality of model layers printed before the most recently solidified model layer; or, The third speed is determined according to the mode, average or weighted average of exposure areas of multiple model layers printed before the most recently solidified model layer; wherein, when the third speed is determined according to the weighted average of exposure areas of multiple model layers, the closer the model layer is to the most recently solidified model layer, the greater the corresponding weight coefficient.

7. The method according to claim 1, characterized in that The first speed and / or the third speed are negatively correlated with the exposure area of ​​the model layer of the solidified part of the model; Determining the first speed and / or the third speed according to an exposure area of ​​the model layer of the solidified part of the model comprises: Determine the ratio of the exposure area of ​​the model layer of the solidified part of the model to the maximum exposure area of ​​the 3D printing device, and determine the allowable speed threshold corresponding to the target ratio range in which the ratio is located; Determining the first speed and / or the third speed according to a set moving speed and the allowable speed threshold; The determining the first speed and / or the third speed according to the set moving speed and the allowed speed threshold comprises: If the set moving speed of the printing platform is less than the allowable speed threshold, the set moving speed is used as the first speed and / or the third speed; or, If the set moving speed of the printing platform is greater than or equal to the allowable speed threshold, the allowable speed threshold is used as the first speed and / or the third speed; The method further comprises: The set acceleration of the printing platform is obtained, and the allowable speed thresholds corresponding to different proportion ranges are determined according to the set acceleration, and the allowable speed threshold corresponding to any proportion range is negatively correlated with the set acceleration.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: In response to a model printing instruction, if the speed control mode is determined to be a speed limit control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the exposure area of ​​the model layer of the solidified part of the model; or, In response to the model printing instruction, if the speed control mode is determined to be the non-speed-limited control mode according to the model printing instruction, the moving speed of the printing platform toward or away from the light source is controlled according to the set moving speed.

9. A light-curing 3D printing device, characterized in that: include: A memory storing programs or instructions; A processor, wherein when executing the program or instruction, the processor implements the steps of the control method of the light-curing 3D printing device according to any one of claims 1 to 8.

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 control method of the light-curing 3D printing device according to any one of claims 1 to 8 are implemented.

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