WO2023185930A1

WO2023185930A1 - Printing control method, photocuring three-dimensional printer and readable storage medium

Info

Publication number: WO2023185930A1
Application number: PCT/CN2023/084724
Authority: WO
Inventors: 邓新桥; 韦华忠
Original assignee: 深圳市纵维立方科技有限公司
Priority date: 2022-03-31
Filing date: 2023-03-29
Publication date: 2023-10-05

Abstract

The present application discloses a printing control method, a photocuring three-dimensional printer and a readable storage medium, and relates to the field of three-dimensional printing; the printing control method comprises: detecting a detection value used for representing the force received by a printing platform of a photocuring three-dimensional printer, obtaining a present detection value; according to a relationship between the present detection value and a preset value range, determining whether the printing state of the photocuring three-dimensional printer is a normal state or an abnormal state; when the printing state of the photocuring three-dimensional printer is an abnormal state, outputting an abnormality prompt signal. The present application makes possible during the printing process of a photocuring three-dimensional printer the detection of a detection value representing the force received by a printing platform of the photocuring three-dimensional printer, determining the printing state of the photocuring three-dimensional printer according to the present detection value, and when the printing state is an abnormal state, outputting an abnormality prompt signal, thereby increasing a printing success rate and achieving finer 3D printing control.

Description

Printing control method, light-curing three-dimensional printer and readable storage medium

Technical field

This application relates to the field of three-dimensional printing, and in particular to a printing control method, a light-curing three-dimensional printer and a readable storage medium.

Background technique

Light-curing 3D (Three Dimensions, three-dimensional) printing technology is widely used in the field of 3D printing due to its advantages such as high printing accuracy and good surface finish. The working principle of the existing light-curing 3D printer is as follows: the model to be printed is first sliced into layers of planes, and then the LCD (Liquid Crystal Display, liquid crystal display) imaging principle is used, driven by the computer and display circuit, The computer program provides an image signal, and a selective transparent area appears on the LCD screen. The ultraviolet light passes through the transparent area and irradiates the photosensitive resin consumables in the resin tank for exposure and curing. After the curing time of each layer is completed, the platform pallet will partially solidify. Lift it up to allow the resin liquid to replenish and flow back. The platform is pressed down again. The thin layer between the model and the release film is exposed to ultraviolet light again and solidified. At this time, the model and the release film are cured and bonded together. The platform pulls the model up. The model and release film are separated under the action of force. However, during the model printing process, printing may fail due to hard impurities in the resin tank, insufficient or too long exposure time, etc. If there is no relevant prompt after a printing failure occurs, the machine will continue to print, which may easily cause problems such as motor stalling and resin waste.

Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art currently need to solve.

Contents of the invention

The purpose of this application is to provide a printing control method, a light-curing three-dimensional printer and a readable storage medium that can detect a detection value used to characterize the stress of the printing platform of the light-curing three-dimensional printer during the printing process of the light-curing three-dimensional printer. , and determine the printing status of the light-curing 3D printer based on the current detection value. When the printing status is abnormal, an abnormal prompt signal is output to improve the printing success rate and achieve more delicate 3D printing control.

In order to solve the above technical problems, the present application provides a printing control method. The printing control method includes: detecting the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer to obtain the current detection value; according to the current detection value The relationship between the detection value and the preset value range determines whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state; when the printing state of the light-curing three-dimensional printer is the abnormal state, an abnormal prompt signal is output.

In order to solve the above technical problems, this application also provides a light-curing three-dimensional printer, including: a memory, used to store a computer program; a processor, used to implement the printing control as described in any one of the above when executing the computer program. Steps of the method; at least one collector is installed on the light-curing three-dimensional printer, the collector is used to sense the current collection value at the setting position of the collector, and send the current collection value to the The processor is configured to obtain the current detection value; the current collection value can reflect the force of the printing platform.

This application provides a printing control method. During the printing process of a light-curing three-dimensional printer, a detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is detected, the current detection value is obtained, and based on the current detection value and the predetermined Set the relationship between the value ranges to determine the printing status of the light-curing 3D printer. When the printing status is an abnormal status, an abnormal prompt signal is output so that the abnormal status can be processed in a timely manner, thereby monitoring the printer status and providing High printing success rate. This application also provides a light-curing three-dimensional printer and a readable storage medium, which have the same beneficial effects as the above-mentioned printing control method.

Description of drawings

In order to explain the embodiments of the present application more clearly, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, As far as workers are concerned, other drawings can also be obtained based on these drawings without exerting creative work.

Figure 1 is a step flow chart of a printing control method provided by this application;

Figure 2 is a schematic structural diagram of a light-curing three-dimensional printer provided by this application;

Figure 3 is a schematic structural diagram of a printing control system provided by this application;

Figure 4 is a schematic structural diagram of another light-curing three-dimensional printer provided by this application;

Figure 5 is a schematic structural diagram of another light-curing three-dimensional printer provided by this application;

Figure 6 is a schematic structural diagram of another light-curing three-dimensional printer provided by this application;

Figure 7 is a schematic structural diagram of another light-curing three-dimensional printer provided by this application.

Detailed ways

The core of this application is to provide a printing control method, a light-curing three-dimensional printer and a readable storage medium, which can detect a detection value used to characterize the stress of the printing platform of the light-curing three-dimensional printer during the printing process of the light-curing three-dimensional printer. , and determine the printing status of the light-curing 3D printer based on the current detection value. When the printing status is abnormal, an abnormal prompt signal is output to improve the printing success rate and achieve more delicate 3D printing control.

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

Please refer to Figure 1, which is a step flow chart of a printing control method provided by this application. The printing control method includes:

S101: Detect the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer to obtain the current detection value; it can be understood that the printing platform of the light-curing three-dimensional printer will move upward or downward corresponding to the printing operation performed by the light-curing three-dimensional printer. When the printing platform moves upward (including the release process of the 3D printing model) or moves downward, there will be an interaction force between the 3D printing model on the printing platform and the release film, and the printing platform and the printing material ( There will also be interaction forces between one or more of the release film, the material trough, or the exposure screen. The force value of the above-mentioned interaction force is positively related to the photo-cured area. Therefore, the current detection value obtained by detecting the force of the printing platform used to characterize the light-curing 3D printer can be used to feed back the light-curing effect, so as to achieve more delicate 3D printing control in the future. Among them, the current detection value is used to represent the force of the printing platform.

In this step, the force sensor of the printing platform of the light-curing 3D printer can be detected through the force sensor installed on the light-curing 3D printer; the corresponding electrical signal can also be collected through other collectors installed on the light-curing 3D printer. The preset corresponding relationship between the electrical signal and the force value is used to determine the force on the printing platform of the light-curing three-dimensional printer; of course, other methods can also be used to detect the force on the printing platform of the light-curing three-dimensional printer. This embodiment will not be detailed here. limited.

In this step, the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer can be detected according to the preset detection period, or the force used to characterize the printing platform of the light-curing three-dimensional printer can be detected after receiving the detection signal. As for the force detection value, this embodiment does not specifically limit the triggering conditions for detecting the force detection value used to characterize the force on the printing platform of the light-curing three-dimensional printer.

In some methods, the deformation value used to characterize the force on the printing platform of the light-curing three-dimensional printer can be detected to obtain the current detection value; or the detection current used to characterize the force on the printing platform of the light-curing three-dimensional printer can be detected. value to obtain the current detection value; or, detect the detection torque value used to characterize the force on the printing platform of the light-curing three-dimensional printer to obtain the current detection value; or detect the force used to characterize the printing platform of the light-curing three-dimensional printer. Detection force value to get the current detection value. In other words, the specific type of detection value can be force value, current value, deformation value, etc. On the basis of force value, it can also be torque value, etc. In some implementations, the force on the printing platform can be detected to obtain the current detection value.

Specifically, the detection signal can be generated in response to a user-selected monitoring printing mode, which is a working mode in which the light-curing three-dimensional printer prints in a monitoring state. Alternatively, the detection signal may be generated in response to user-selected detection instructions.

S102: According to the relationship between the current detection value and the preset value range, determine whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state; as an optional embodiment, the preset value range can be different for different printing states. Make settings and the printing status can include normal status and abnormal status. Correspondingly, the preset value range may include a first preset value range corresponding to the normal state and a second preset value range corresponding to the abnormal state. In some embodiments, the printing state may also include a state to be determined. The state to be determined is a printing state that may be converted to a normal state after automatic processing. The preset value range may also include a third predetermined state corresponding to the state to be determined. Set the value range. In some specific embodiments, the intersection of the first preset value range, the second preset value range and the third preset value range is an empty set. Specifically, if the current detection value is in the first preset value range, it is determined that the printing state of the light-curing three-dimensional printer is a normal state; if the current detection value is in the second preset value range, it is determined that the printing state of the light-curing three-dimensional printer is Abnormal state; if the current detection value is within the third preset value range, it is determined that the printing state of the light-curing 3D printer is in a pending state.

As another optional embodiment, the preset value range can be set for a single printing state. For example, the preset value range can be set for the normal printing state of a light-curing three-dimensional printer. If the current detection value is at the preset value Within the range, the printing status of the light-curing 3D printer is determined to be a normal state. If the current detection value is not within the preset value range, the printing status of the light-curing 3D printer is determined to be an abnormal state; for another example, the abnormality of the light-curing 3D printer can be targeted The printing status sets the preset value range. If the current detection value is within the preset value range, it is determined that the printing status of the light-curing 3D printer is an abnormal state. If the current detection value is outside the preset value range, the printing state of the light-curing 3D printer is determined to be abnormal. The printing status is normal.

Of course, in addition to setting the preset value range based on the above-mentioned normal state, abnormal state and other printing states, the printing states of the light-curing 3D printer can also be further divided, such as further dividing the abnormal state, and targeting multiple divided Set preset value ranges for abnormal status respectively, so as to achieve more delicate 3D printing control and improve printing success rate.

It is understandable that, considering that different models of light-curing 3D printers, light-curing 3D printers use different types of light-curing printing materials, or the printing platform is in different printing stages, the stress on the printing platform may change. , therefore, corresponding preset value ranges can be set for the above different working conditions. In the actual application process, based on the model of the light-curing 3D printer, the light-curing printing material used by the light-curing 3D printer, the current printing stage of the printing platform and other working conditions information, the preset value for comparison with the current detection value is determined. value range, thereby further improving the reliability and accuracy of the judgment results of the printing status of the light-curing 3D printer.

Correspondingly, before performing this step, an operation of determining the working condition information of the light-curing three-dimensional printer may also be included. As a preferred embodiment, a relationship table can be pre-stored in the light-curing three-dimensional printer. The relationship table includes correspondences between the light-curing three-dimensional printer model, light-curing printing materials, printing stages, and preset value ranges. At the beginning of printing, based on the current working condition information, such as the model of the light-curing 3D printer, the current printing stage, and the type of light-curing printing material, the corresponding relationship table is obtained. During the printing process, the corresponding presets are matched in the relationship table according to the current printing stage. Set the value range, and determine the printing status of the light-curing 3D printer based on the relationship between the matched preset value range and the current detection value.

Of course, in addition to the above-mentioned light-curing three-dimensional printer model, light-curing printing material, and printing stage, the working condition information may also include other information that may affect the stress of the printing platform, which is not specifically limited in this embodiment.

S103: When the printing status of the light-curing 3D printer is abnormal, an abnormal prompt signal is output.

Specifically, when the printing state of the light-curing three-dimensional printer is determined to be an abnormal state, an abnormal prompt signal is output. In specific embodiments, the abnormal prompt signal can be used to prompt the user to handle the abnormal printing status of the stereolithographic three-dimensional printer in a timely manner, or the abnormal prompt signal can be used as a trigger condition for automatic processing of the stereolithographic three-dimensional printer, or can be used to prompt The user handles the abnormal printing status of the light-curing three-dimensional printer in a timely manner and serves as a trigger condition for the automatic processing of the light-curing three-dimensional printer. When it is determined that the printing state of the light-curing three-dimensional printer is a normal state, no processing is required and the steps of S101 are repeated.

It can be seen that in this embodiment, during the printing process of the light-curing three-dimensional printer, the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is detected, the current detection value is obtained, and the current detection value is obtained according to the current detection value and the preset value range. Relationship to determine the printing status of the light-curing 3D printer. When the printing status is abnormal, an abnormal prompt signal is output so that the abnormal status can be processed in a timely manner, thereby monitoring the printer status and improving the success rate of printing.

Based on the above embodiments:

As an optional embodiment, before determining whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state according to the relationship between the current detection value and the preset value range, the printing control method further includes: according to the current printing state of the printing platform stage, determine the preset value range corresponding to the current printing stage; the current printing stage is the printing stage that the printing platform is currently in, and the printing stage includes the pressing stage and the release stage.

As an optional embodiment, before determining whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state according to the relationship between the current detection value and the preset value range, the printing control method further includes: according to the printing state of the light-curing three-dimensional printer. The current layer area determines the preset value range corresponding to the current layer area; where the current layer area is determined by the exposure area of the most recent preset exposure of the model being printed.

As an optional embodiment, before determining whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state according to the relationship between the current detection value and the preset value range, the printing control method further includes: according to the current printing state of the printing platform stage and the current layer area of the light-curing 3D printer to determine the corresponding preset value range; the current printing stage is the printing stage that the printing platform is currently in, and the printing stage includes the pressing stage and the release stage; among them, the current layer area Determined by the exposure area of the most recent preset exposure of the model being printed.

Specifically, the exposure area of the latest exposure of the model being printed can be used as the current layer area, that is, the physical area of the layer of the current model closest to the release film. This layer is the contact layer with the release film. In this way, it can This allows the size of the preset value range to change as the area of the current layer being printed changes, thereby more accurately determining whether the printer is in an abnormal state. The exposure area of the most recent preset exposure of the model being printed can also be used as the current layer area. The average area of the exposure area of the most recent preset exposures of the model being printed can also be used as the current layer area.

It is understandable that at different printing stages, the size of the collected values will change. In some embodiments, the printing stage of the printing platform includes a pressing stage and a release stage. Correspondingly, the preset value range includes a preset value range corresponding to the pressing stage and a preset value range corresponding to the release stage. Value range. During the printing process, if it is determined that the current printing stage of the printing platform is the pressing stage, the printing status of the light-curing 3D printer is determined based on the relationship between the preset value range corresponding to the pressing stage and the current detection value; if it is determined that the printing stage of the printing platform is If the current printing stage is the release stage, the printing status of the light-curing 3D printer is determined based on the relationship between the preset value range corresponding to the release stage and the current detection value.

In some embodiments, the printing stage may also include a lifting stage. Correspondingly, the preset value range also includes a preset value range corresponding to the lifting stage, which may be determined according to whether the current printing stage is the lifting stage. The preset value range corresponding to the stage; and when the current detection value is within the preset value range corresponding to the lifting stage, it is determined that the printing state of the light-curing 3D printer is a normal state; and the current detection value is within the preset value range corresponding to the lifting stage. When the value is outside the preset value range, it is determined that the printing state of the light-curing 3D printer is an abnormal state of abnormal upward movement, and the printing platform is controlled to execute the reaction action corresponding to the abnormal state of abnormal upward movement, and the reaction corresponding to the abnormal state of abnormal upward movement. Actions include but are not limited to one or more of the following actions: controlling the printing platform to decelerate and lift, stop moving, press down a preset distance, and stop movement and then press down a preset distance. The lifting stage is the stage in which the printing platform lifts up after the release stage.

In some embodiments, the printing stage may also include an exposure stage. Correspondingly, the preset value range also includes a preset value range corresponding to the exposure stage. The preset value range corresponding to the exposure stage may be determined based on whether the current printing stage is the exposure stage. Set the value range; and when the current detection value is within the preset value range corresponding to the exposure stage, it is determined that the printing status of the light-curing 3D printer is normal; and the current detection value is within the preset value range corresponding to the exposure stage. When outside, it is determined that the printing state of the light-curing three-dimensional printer is an abnormal state of abnormal exposure, and the printing platform is controlled to perform a reaction action corresponding to the abnormal state of abnormal exposure. The response actions corresponding to the abnormal state of abnormal exposure include but are not limited to one or more of the following actions: stopping exposure, retrying exposure, controlling the printing platform to lift up, stopping movement, pressing down for a preset distance, etc. The exposure stage is a stage in which the light source at the bottom of the resin tank exposes and solidifies the resin located at the bottom of the resin tank.

The reaction action may not only be an action for remedial purposes, but may also be an action for prevention, intervention, or other purposes. This embodiment is not specifically limited here. As an optional embodiment, the abnormal state includes an abnormal state of abnormal release and an abnormal state of abnormal pressing. According to the relationship between the current detection value and the preset value range, it is determined that the printing state of the light-curing 3D printer is a normal state. Or the process of abnormal status includes: when the current printing stage is the release stage and the current detection value is within the preset value range corresponding to the release stage, determine that the printing state of the light-curing 3D printer is a normal state; when the current printing When the stage is the release stage, and the current detection value is outside the preset value range corresponding to the release stage, determine that the printing state of the light-curing 3D printer is an abnormal state of release abnormality, and control the printing platform execution and release abnormality. The reaction action corresponding to the abnormal state; when the current printing stage is the pressing stage, and the current detection value is within the preset value range corresponding to the pressing stage, the printing state of the light-curing 3D printer is determined to be the normal state; when When the current printing stage is the pressing stage, and the current detection value is outside the preset value range corresponding to the pressing stage, it is determined that the printing state of the light-curing 3D printer is an abnormal state of pressing abnormality, and the printing platform execution and pressing are controlled. Reaction actions corresponding to abnormal abnormal conditions.

As an optional embodiment, the abnormal state of abnormal release includes the abnormal state of model fault, the abnormal state of model fracture, and the abnormal state of excessive release force of the current printing layer.

Among them, the abnormal state of model fault is the abnormal state of the phenomenon that when the current printing layer is separated from the release film, the entire layer of the model that is adhered to the current printing layer and the printing platform is disconnected. Specifically, the current printing layer is disconnected from the whole layer of the model adhered to the printing platform. It can be between the current printing layer and the layer above the current printing layer; it can also be the disconnection between the current printing layer and the layer before the current printing layer. Or the multiple layers are not disconnected, but the multiple layers including the current printing layer are disconnected from the entire model layer adhered to the printing platform; this embodiment is not specifically limited here. It can be understood that in the abnormal state of model fault, since the printing platform and the current printing layer no longer have a rigid connection relationship, the current printing layer cannot be separated by lifting the printing platform, and the printed model fault will fail to print the model. .

The abnormal state of model breakage is when the current printing layer is separated from the release film and the connection of some layers of the model adhered to the printing platform is found to be broken or cracked. Specifically, the connection between some layers of the model adhered to the printing platform is broken or cracked, which can be the connection between the current printing layer and the layer above the current printing layer; it can also be the connection between the current printing layer and the current printing layer. The connection between the previous layer or layers is not broken or cracked, but the connection between the multiple layers, including the current printing layer, and the model adhered to the printing platform is broken or cracked; this embodiment is not specifically limited here. It can be understood that in the abnormal state of model breakage, due to the weak rigid connection between the printing platform and the current printing layer, it is difficult to lift the printing platform to release the current printing layer, and the printed model will break/crack. Phenomenon, affecting the appearance and reliability of the model.

The abnormal state of excessive release force of the current printing layer is the abnormal state of excessive release force when the current printing layer is separated from the release film. It can be understood that when the front printing layer is separated from the release film, excessive release force may cause damage to the model and may also cause damage to the release film.

It can be understood that the abnormal state of release abnormality includes the first abnormal state of release of model fault, the second abnormal state of release of model fracture, and the third abnormal state of release of excessive release force of the current printing layer. When the curing 3D printer is in different abnormal release states, the reaction actions performed can be the same or different. When the light-curing 3D printer is in different abnormal release states and performs different reaction actions, the printing platform is controlled to execute the reaction actions corresponding to the abnormal release state, including: determining the current abnormal release state, the current abnormal release state, The abnormal state of release is the first abnormal state of release, the second abnormal state of release, or the third abnormal state of release; the printing platform is controlled to execute a reaction action corresponding to the current abnormal state of release.

Set abnormal value ranges respectively for the above-mentioned first detachment abnormal state, second detachment abnormal state and third detachment abnormal state. The first detachment abnormal state corresponds to the first abnormal value range, and the second detachment abnormal state corresponds to The second abnormal value range and the third out-of-type abnormal state correspond to the third abnormal value range. It can be understood that the maximum value of the first abnormal value range is smaller than the minimum value of the second abnormal value range. The second abnormal value range The maximum value of the value range is smaller than the minimum value of the third abnormal value range. In a specific embodiment, the first abnormal value range is a value range smaller than the first preset value, the second abnormal value range is a value range greater than the first preset value and smaller than the second preset value, and the third abnormal value range is a value range greater than the first preset value and less than the second preset value. The abnormal value range is the value range greater than the third preset value, and the preset value range is the value range greater than the second preset value and less than the third preset value, that is Say, the maximum value of the first abnormal value range < the first preset value < the minimum value of the second abnormal value range < the maximum value of the second abnormal value range < the second preset value < the preset value range Minimum value <maximum value of the preset value range<third preset value<minimum value of the third abnormal value range. Of course, as another optional embodiment, the minimum value of the second abnormal value range may also be equal to the first preset value, the maximum value of the second abnormal value range may also be equal to the second preset value, and the third The minimum value of the abnormal value range can also be equal to the third preset value; or the minimum value of the preset value range can also be equal to the second preset value, and the maximum value of the second preset value range can also be equal to the third preset value. The setting value can be set according to the actual project needs, and there is no specific limit here.

Specifically, if the current detection value is in the first abnormal value range, it is determined that the printing state of the light-curing three-dimensional printer is an abnormal state of the model fault. At this time, the reaction actions performed by controlling the printing platform include but are not limited to: controlling the printing platform to re-download. Press to the preset exposure position, and control the light source of the light-curing three-dimensional printer to re-expose and cure the current printing layer with the first exposure parameter to perform supplementary printing on the current printing layer. Specifically, the current printing layer may be exposed and cured again with the first exposure parameter. As a result, the printing platform is controlled to execute reaction actions corresponding to the current abnormal release state, and automatic supplementary printing can be realized when printing abnormalities or printing failures occur, thereby improving the intelligence of the printing equipment, improving the printing success rate, and improving user experience. Convenience.

If the current detection value is in the second abnormal value range, it is determined that the printing state of the light-curing 3D printer is an abnormal state of model fracture. At this time, the reaction actions performed by controlling the printing platform include but are not limited to: controlling the printing platform to be pressed down again to the predetermined level. Set the exposure position, and control the light source of the light-curing three-dimensional printer to re-expose and cure the current printing layer with the second exposure parameter to perform supplementary printing on the current printing layer. Specifically, the current printing layer may be exposed and cured again with the second exposure parameter. In specific embodiments, the first exposure parameter may be the same as or different from the second exposure parameter. For example, the exposure duration of the first exposure parameter is longer than the exposure duration of the second exposure parameter; or the exposure intensity of the first exposure parameter is stronger than the exposure intensity of the second exposure parameter; or the exposure duration of the first exposure parameter is longer than the second exposure parameter. The exposure time is longer and the exposure intensity of the first exposure parameter is stronger than the exposure intensity of the second exposure parameter. In this way, it can be adjusted according to actual engineering needs, so that the intensity of the complementary printing process for printing faults is higher than the intensity of the complementary printing processing for printing fractures.

If the current detection value is in the third abnormal value range, it is determined that the printing state of the light-curing 3D printer is an abnormal state in which the release force of the current printing layer is too large. At this time, the reaction action performed by the control printing platform includes one of the following actions. Or more: control the printing platform to decelerate and lift, stop moving, press down a preset distance, or stop movement and then press down a preset distance. After executing the above reaction action, if the detected current detection value is within the preset value range corresponding to the normal state, you can try to perform the release action again, which will help the printer's printing status to automatically normalize. Thereby, the printing platform is controlled to perform reaction actions corresponding to the current abnormal state of separation. It can be understood that excessive release force may cause problems such as faults, fractures or damage to the release film. Therefore, before the above problems occur, when the release force is too large, corresponding reaction actions can be performed to identify it in advance. Risk and rescue can improve the success rate of printing, thereby improving the intelligence and user convenience of printing equipment.

In some embodiments, before the device executes the reaction action corresponding to the abnormal state, it can be confirmed by the user through the interactive screen, so as to meet the user's personalized operation needs.

As an optional embodiment, the process of controlling the printing platform to perform reaction actions corresponding to the abnormal state of abnormal pressing includes: determining whether the current detection value is greater than or equal to the safety threshold; if the current detection value is less than the safety threshold, control printing The platform decelerates and presses down; if the current detection value is greater than or equal to the safety threshold, the printing platform is controlled to stop moving, or Control the printing platform to lift up, or control the printing platform to stop moving and then lift up.

Specifically, if the current printing stage is the pressing stage and the current detection value is outside the preset value range corresponding to the pressing stage, it is determined that the printing state of the light-curing 3D printer is an abnormal state of abnormal pressing. At this time, Determine whether the current detection value is greater than or equal to the safety threshold. If the current detection value is less than the safety threshold, control the printing platform to decelerate and press down. If the current detection value returns to the preset value range corresponding to the normal state of the pressing stage, the execution is normal. Press down action; if the current detection value is greater than or equal to the safety threshold, the printing platform is controlled to stop moving, or the printing platform is controlled to lift up, or the printing platform is controlled to stop moving and then lift up. In order to avoid screen breakage, it is not necessary to Perform the pressing action again. In some embodiments, after controlling the printing platform to stop moving, the motor can be controlled to automatically restart. In this way, when the printer encounters an abnormal state of abnormal pressure, the device can be automatically adjusted, which is helpful for the device to automatically eliminate abnormalities, thereby improving the intelligence of the printing device, improving the printing success rate, and improving user convenience.

As an optional embodiment, before determining whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state according to the relationship between the current detection value and the preset value range, the printing control method also includes: obtaining and collecting the settings of the collector. The preset value range corresponding to the position; detect the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer to obtain the current detection value, including: detecting the force of the printing platform used to characterize the light-curing three-dimensional printer through the collector. The collected value of the force is obtained to obtain the current collected value, and the current collected value is used as the current detection value.

The light-curing three-dimensional printer in the embodiment of the present application is provided with a collector. Specifically, the collector can be set at one or more of the following locations: on the cantilever of the printing platform, on the connection between the printing platform and the cantilever of the printing platform, on the printing platform, between the driving motor of the printing platform and the lead screw, and on the printing platform. In the drive motor, the drive circuit corresponding to the drive motor of the printing platform. Or other parts that are connected or linked to the printing platform to reflect the stress on the printing platform. For example, the collector is used to detect the force at its installation position to obtain the current collection value. In this embodiment, the current collection value of the collector is used as the current detection value.

It can be understood that the categories of collected values of collectors at different setting positions may be different. For example, the collector installed above the printing platform is a pressure collector or a pull collector, and the collector installed between the drive motor and the screw rod is a torque collector. For another example, the collector installed in the driving motor of the printing platform is a non-traditional collector. The collector in the driving motor is a current detection device, which reflects the stress of the printing platform by detecting the current of the driving motor of the printing platform. . For another example, the collector of the drive circuit corresponding to the drive motor of the printing platform may be the drive circuit itself, or may be the force detection circuit in the drive circuit. The force detection circuit is a circuit that detects the voltage signal or circuit signal in the drive circuit and converts the voltage signal or circuit signal into the value of the motor output. The drive circuit itself can also output a voltage signal or circuit signal in the drive circuit to convert the voltage signal or circuit signal into a value output by the motor. The collection values of different categories will also have different value sizes. Even if the collection values at different setting locations are of the same category, their value sizes may be different. Since the collection values of collectors at different setting positions or different categories are different, the preset value ranges corresponding to different setting positions or collectors of different categories are also different. Therefore, the setting position and collector of each collector need to be constructed in advance. The correspondence between the category and the preset value range. After determining the setting position of the collector on the stereolithography 3D printer, the preset value corresponding to the setting position is determined based on the variation range of the collection value and the pre-built correspondence. Value range, so that the printing status of the light-curing 3D printer can be judged as normal or abnormal based on the relationship between the preset value range and the current detection value, thereby improving the accuracy and reliability of the judgment results. As an optional embodiment, detection is used to characterize photocured three-dimensional The detection value of the force on the printing platform of the printer. The process of obtaining the current detection value includes:

The collector is used to collect collection values used to characterize the force of the printing platform of the light-curing three-dimensional printer to obtain the current collection value; where the collector is a strain gauge, and the strain gauge is set at one or more of the following locations: On the cantilever, on the connection part of the printing platform and the cantilever of the printing platform, on the printing platform; or, the collector is a torque sensor, and the torque sensor is set between the drive motor and the screw rod of the printing platform; or, the collector is a current collector , the current collector is set in the drive motor of the printing platform or in the drive circuit corresponding to the drive motor of the printing platform. Alternatively, the collector can be a force sensor, and the force sensor can be a strain gauge type, tension type, pressure type or other form of force sensor; the force sensor is set at one or more of the following locations: on the cantilever of the printing platform, on the printing platform On the connection part with the cantilever of the printing platform and on the printing platform. Then, the current detection value corresponding to the current acquisition value is determined based on the current acquisition value.

That is to say, detecting the detection value used to characterize the force on the printing platform of the light-curing three-dimensional printer includes: detecting the deformation value used to characterize the force on the printing platform of the light-curing three-dimensional printer through the strain gauge as mentioned above; or through As mentioned above, the current collector detects the detection current value used to characterize the force on the printing platform of the light-curing three-dimensional printer; or the above-mentioned torque sensor detects the detection torque value used to characterize the force on the printing platform of the light-curing three-dimensional printer. ; Or detect the force value used to characterize the force of the printing platform of the light-curing three-dimensional printer through the force sensor as described above.

It should be noted that when the current detection value is a deformation value, the preset value range corresponds to the preset deformation value range; when the current detection value is a current value, the preset value range corresponds to the preset current value range. ; When the current detection value is a torque value, the preset value range corresponds to the preset torque value range; when the current detection value is a force value, the preset value range corresponds to the preset force value range.

As an optional embodiment, the process of determining the current detection value corresponding to the current collection value according to the current collection value includes: using the current collection value as the current detection value; or: obtaining the preset value corresponding to the type and setting position of the collector. Set the mapping relationship; the preset mapping relationship is the mapping relationship between the preset current detection value and the current collection value of the collector; the current detection value is obtained based on the current collection value and the preset mapping relationship.

In some implementations, the mapping relationships between collected values and detection values of different categories may be different. Therefore, the mapping relationship between the detection values and the collected values of the collectors at each installation position can be constructed in advance based on the installation positions of the collectors. In the process of detecting the force on the printing platform of the light-curing 3D printer, the preset mapping relationship corresponding to the setting position of the collector is obtained, and the current collection value of the collector is mapped according to the preset mapping relationship to represent the force on the printing platform. The current detection value of the value.

It can be seen that due to the different setting positions of the collectors, the categories of the collected values may be different. Different categories of collected values will also have different sizes of collected values. Even if the categories of collected values are the same, due to the different setting positions of the collectors, the size of the collected values will be different. There may also be differences in size, such as the size of the collected values of the collector set above the printing platform and the collected values of the collector set between the drive motor and the screw rod at the same time. In order to avoid setting a preset value range for the detection value of the collector at each setting position, this embodiment can convert the collection values at the setting position of each collector into a representation of the printing platform through the corresponding preset mapping relationship. The detected force value, for example, when the collector is set on the cantilever of the printing platform, the first preset mapping relationship corresponding to it is used to convert the current collection value of the collector into the current value through the first preset mapping relationship. The current detection value reflects the stress of the printing platform. In other words, the current detection value can be regarded as the stress value of the printing platform. When the collector is set between the drive motor of the printing platform and the screw rod, the corresponding second preset mapping relationship is used to convert the current collection value of the collector through the second preset mapping relationship. is the current detection value, which reflects the stress of the printing platform. In other words, the current detection value can be regarded as the stress value of the printing platform. By analogy, each setting position has a corresponding preset mapping relationship. In this way, when setting the preset value range, there is no need to consider the setting position of each collector. It is enough to only store a set of preset value ranges corresponding to the force values of the printing platform. Since the amount of pre-stored data is small, Saves storage space of light-curing 3D printing equipment.

As an optional embodiment, when the collector is a current detection device installed in the driving motor of the printing platform, the collector is used to detect the force of the collector at the set position to obtain the current collection value, including: passing current The detection device detects the motor current value of the driving motor; the collection value is obtained based on the relationship between the motor current value and the preset conversion function; the collection value is used to represent the driving value of the printing platform.

It can be understood that in this embodiment, the current detection device integrated in the driving motor is selected as the collector. During the operation of the driving motor, the motor current value of the driving motor is detected through the current detection device. Based on the relationship between the motor current value and the preset conversion function Obtain the collected value and determine the current detection value based on the collected value. In this way, there is no need to install an additional physical collector on the device. Instead, the motor current of the existing drive motor can be used to detect the force, which can save the hardware cost and device size of the device.

As an optional embodiment, the collector at least includes a main collector and an auxiliary collector, and the main collector and the auxiliary collector are located at different setting positions; the collector is used to collect the data of the printing platform of the light-curing three-dimensional printer. The process of obtaining the current collection value from the force collection value includes: using the main collector, collecting the force collection value used to characterize the printing platform of the light-curing 3D printer at the setting position of the main collector to obtain the main collection value; through the auxiliary collection value The collector collects the collection value used to characterize the force of the printing platform of the light-curing 3D printer at the setting position of the auxiliary collector to obtain the auxiliary collection value; determine whether the main collection value is valid based on the auxiliary collection value; if so, use the main collection value as The current collection value; if not, use the auxiliary collection value as the current collection value.

In order to improve the accuracy and reliability of the current detection value, the light-curing three-dimensional printer provided in this embodiment is equipped with multiple collectors. The multiple collectors are located at one or more of the following locations: printing platform On the cantilever, on the connection between the printing platform and the cantilever of the printing platform, on the printing platform, between the driving motor of the printing platform and the screw rod, in the driving motor of the printing platform, or other places that are connected or linked to the printing platform to enable The part that reflects the stress on the printing platform. It can be understood that, among the plurality of collectors, one collector is disposed above the cantilever and the other sensor is disposed below the cantilever, which also belong to different setting positions. The plurality of collectors include at least one main collector and at least one auxiliary collector. The main collector detects the force of the main collector at the setting position of the main collector to obtain the main collection value. The auxiliary collector detects the auxiliary collector. The force at the setting position of the auxiliary collector is used to obtain the auxiliary collection value. The auxiliary collection value of the auxiliary collector is used as a basis to determine whether the main collection value of the main collector is valid. If it is valid, the main collection value is determined as the current collection. value and perform subsequent processing. If it is invalid, determine the auxiliary collection value as the current collection value and perform subsequent processing.

As an optional embodiment, determining whether the main collection value is valid based on the auxiliary collection value includes:

Determine the first collection value range where the main collection value is located and the second collection value range where the auxiliary collection value is located; determine whether the first collection value range and the second collection value range match the same printing status; if so, determine whether the main collection value is valid ; As an optional embodiment, judging whether the main collection value is valid based on the auxiliary collection value includes: determining the first fluctuation value corresponding to the main collection value based on the main collection value and the historical main collection value of the main collector; based on the auxiliary collection value; Collection values and historical auxiliary collection of auxiliary collectors value, determine the second fluctuation value corresponding to the auxiliary acquisition value; when the difference between the first fluctuation value and the second fluctuation value is less than the preset difference, it is determined that the main acquisition value is valid; when the difference between the first fluctuation value and the second fluctuation value The value is greater than the preset difference. The effective priority of the main collector and the auxiliary collector is determined based on the setting position of the main collector and the setting position of the auxiliary collector. If the effective priority of the main collector is higher than the effective priority of the auxiliary collector, level, it is judged that the main collection value is valid, otherwise, it is judged that the main collection value is invalid.

It is understandable that the reliability of collectors installed at different positions of a light-curing 3D printer is different. For example, a collector integrated inside the drive motor is more likely to be damaged. Therefore, a collector integrated inside the drive motor is more susceptible to damage than a collector installed inside the drive motor. The reliability of collectors at other locations is lower. Therefore, the effective priority can be set according to the setting positions of the main collector and auxiliary collector. The higher the effective priority, the more reliable the collection value of the collector is.

The main collection value in this embodiment is the collection value of the main collector at the current collection time, and the historical main collection value is the collection value of the main collector at the historical collection time before the current collection time, such as the historical collection value closest to the current collection time. time, determine the first fluctuation value based on the main collection value at the current collection time and the historical main collection value. The first fluctuation value can be the difference between the main collection value and the historical main collection value. In this embodiment, the auxiliary collection value is the collection value of the auxiliary collector at the current collection time, and the historical auxiliary collection value is the collection value of the auxiliary collector at the historical collection time before the current collection time, such as the historical collection value closest to the current collection time. time, determine the second fluctuation value based on the auxiliary collection value at the current collection time and the historical auxiliary collection value. The second fluctuation value may be the difference between the auxiliary collection value and the historical auxiliary collection value.

If the difference between the first fluctuation value and the second fluctuation value is less than the preset difference value, it means that the changes in the main acquisition value and the auxiliary acquisition value at the current moment are not much different, and the main acquisition value is determined to be valid at this time.

If the difference between the first fluctuation value and the second fluctuation value is greater than or equal to the preset difference value, it means that the main acquisition value at the current moment has a large change or the auxiliary acquisition value has a large change. The mutation of the acquisition value may be due to the collector. Caused by an abnormality, or caused by a sudden change in the printing status of the light-curing three-dimensional printer. At this time, in order to ensure the subsequent accurate judgment of the printing status of the light-curing three-dimensional printer, this embodiment determines the current collection value based on the effective priority of the collector. Specifically, the collection value of the collector with a higher effective priority is selected as the current collection value.

As an optional embodiment, judging whether the main collection value is valid based on the auxiliary collection value includes: the collector includes at least one main collector and at least two auxiliary collectors; when the first change amount corresponding to the main collection value exceeds the preset Change amount, determine whether there are at least two auxiliary acquisition values corresponding to the second change amount exceeding the preset change amount; if so, determine the main acquisition value is valid.

For the convenience of explaining this embodiment, it is assumed that the collector includes a main collector and two auxiliary collectors. After obtaining the collection values of each collector, the value change amount of each collector is determined respectively. The value change amount is for the collector. The difference between the current collection value and the historical collection value. The historical collection value can specifically be the collection value of the collector at the historical collection time closest to the current collection time. If the value change corresponding to the main collector is the first change , exceeding the preset change amount. At this time, determine the corresponding value changes of the two auxiliary collectors, that is, whether the second change amount also exceeds the preset change amount. If so, determine that the main collection value is valid. If not, it is necessary Further processing is performed to determine whether the main acquisition value is valid. It can be understood that if the change amount of the value corresponding to the main collector, that is, the first change amount exceeds the preset change amount, and the second change amount of at least two auxiliary collection values also exceeds the preset change amount, it means that each collector detects If the force on the printing platform suddenly changes, it can be judged whether the main acquisition value is valid, which can improve the detection accuracy of the main acquisition device.

In some embodiments, the collector includes a main collector. After obtaining the collection value of the main collector, if the current detection value obtained by the main collector is not within the preset value range, the main collector detects is not within the default value range Based on the time point of the current detection value in the surrounding area, push forward the preset time length to calculate the value change amount of this time period. If the value change amount exceeds the preset change amount, it means that there is a jump characteristic, and the main acquisition is determined. The current collection value of the collector is valid, which can improve the accuracy of the force detection of the main collector. It can be understood that during the printing process, when an abnormality occurs, the force is likely to exhibit jumping characteristics. Therefore, when it is detected that it is not within the preset value range and exhibits jumping characteristics, the detection of the force is more likely to be accurate. . As an optional embodiment, a detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is detected. After obtaining the current detection value, the printing control method further includes: printing the printing data at the current moment according to a preset time interval. Upload to the remote device; among them, the printing data at the current moment includes the current detection value at the current moment, the printing stage at the current moment, and the exposure parameters at the current moment; the exposure parameters include the exposure image area, exposure duration, and exposure intensity; the remote device can It is a cloud server, so that the cloud server can analyze and optimize the received printing data to obtain the optimized motor driving speed and/or optimized model slicing information, so that subsequent printing of slicing is more reasonable and the success rate is higher. Alternatively, the remote device can also be a mobile terminal such as a mobile phone or tablet. Specifically, the cloud server is used to analyze and optimize the received printing data. The cloud server may be used to perform big data analysis on the received printing data, and through the big data analysis, different types of resins, different models of equipment, The optimal slicing plan and printing speed setting plan are obtained for the layers with different exposure areas and the corresponding release force during the release process, so as to optimize the model slicing information and even the motor driving speed. Among them, the slicing plan includes but is not limited to slicing layer height, exposure time, exposure intensity, etc. Alternatively, the unreasonable preset value range set on the device can also be optimized through background big data.

As an optional embodiment, the printing control method also includes: when printing the first layer of the model to be printed, controlling the printing platform to press down until the current detection value reaches a preset threshold, and determining the position of the printing platform at this time as Target position; control the printing platform to continue pressing down the preset distance from the target position, and use the stroke position of the motor at this time as the zero point position of the motor, and control the light source exposure of the light-curing 3D printer to cure the first layer of the model to be printed. .

Specifically, this embodiment realizes the automatic acquisition of the device zero point through the above method, and with the floating screen component, it can realize automatic leveling or leveling-free, and the model can be printed without the need for user leveling.

As an optional embodiment, the process of controlling the printing platform to press down until the current detection value reaches a preset threshold includes: before the printing platform is pressed down to the first preset position, controlling the printing platform to press down at a first pressing speed. ; After the printing platform is pressed down to the first preset position, the printing platform is controlled to be pressed down at the second pressing speed; the first pressing speed is greater than the second pressing speed, and the first preset position is higher than or level with the light. The liquid level when the printing material in the curing trough of a 3D printer is full.

Specifically, a limit detector can be set on the light-curing 3D printer to determine the limit position of the limit sensor as the first preset position. During the process of pressing down the printing platform, before reaching the first preset position, the control The printing platform is pressed down at a first pressing speed, and the printing platform is controlled to be pressed down at a first pressing speed, and the first pressing speed is greater than the second pressing speed. It can be understood that pressing down at a faster speed before the printing platform reaches the first preset position, and pressing down at a slower speed after reaching the first preset position, can speed up the operation of the equipment while preventing During the pressing process after reaching the first preset position, the motor stalls due to the excessive resistance brought by the resin tension to the pressing of the printing platform, which improves the safety of equipment operation.

As an optional embodiment, a detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is detected. After obtaining the current detection value, the printing control method further includes: based on the detection value detected during the model printing process , generate a report on the stress changes of the printing platform during the model printing process; after the model printing is completed, the report is output to the preset storage space. time, and output a report completion prompt.

It can be understood that by monitoring the detection values of the printing process, a report of the force changes of the printing platform during the model printing process is generated. The report can include a risk report and an error report, where the risk report is when the final model is successfully printed. The output report, the error report is the report output when the final model fails to print. In this way, after the model is printed, the user can analyze the changes in the detected values during the printing process to reflect the changing process of the force on the printing platform, so that the user can adjust the printing parameters for the next printing, or perform targeted post-processing on the printed model. . In some embodiments, the report can be output to an interactive screen presentation; in some embodiments, the report can be output to an external storage device connected to the 3D printer, for example, the external storage device can be a USB flash drive; thus it can be convenient for the user Print the report through an external paper printer; in some implementations, the report can be output to the cloud server so that the report can be presented on the cloud platform website or APP on the PC or mobile phone for user convenience.

In a second aspect, the application also provides a readable storage medium. A computer program is stored on the readable storage medium. When the computer program is executed by a processor, the steps of any of the above printing control methods are implemented.

For an introduction to a readable storage medium provided by this application, please refer to the above embodiment, and this application will not describe it in detail here.

The readable storage medium provided by this application has the same beneficial effects as the above print control method.

In the third aspect, reference may be made to FIG. 2 , which is a schematic structural diagram of a light-curing three-dimensional printer provided by the present application, including: a memory 21 for storing a computer program; a processor 22 for executing the computer program to implement the above. The steps of the printing control method described in any embodiment of this article; at least one collector 23 is set on the light-curing three-dimensional printer. The collector is used to sense the current collection value at the setting position of the collector and send the current collection value. to the processor to obtain the current detection value; the current acquisition value can reflect the force on the printing platform. For example, the collector 23 is used to sense the force of the collector 23 at the set position, obtain the current collection value, and send the current collection value to the processor 22 to obtain the current detection value. The force of the collector 23 at the set position is The size can reflect the force on the printing platform.

In this way, the printing monitoring of the light-curing three-dimensional printer can be realized through the collector 23. The light-curing three-dimensional printer provided by the present application has the same beneficial effects as the above-mentioned printing control method.

As an embodiment, the light-curing three-dimensional printer further includes: a base; a connecting portion connected to a driving module; a driving module disposed on the base; a printing platform connected to the connecting portion to drive The module is used to drive the movement of the printing platform; the force sensor is arranged at one or more places on the printing platform, the driving module, and the connection between the printing platform and the driving module.

It can be understood that the printing platform is connected to the driving module through the connecting part. When the driving module drives the printing platform to move, there will be an interaction force between the 3D printing model on the printing platform and the release film, and the printing platform and the printing material (such as the resin material placed in the trough below the printing platform ), release film, material trough or exposure screen, there will also be an interaction force between one or more of them. The force value of the above-mentioned interaction force is positively related to the photo-curing area. Therefore, it can be detected and characterized by the collector 23 The force detection value of the printing platform of the light-curing 3D printer can be used to achieve more detailed printing control based on the stress of the printing platform. The number of collectors 23 may be one or more. In a specific implementation, the collector 23 can be disposed at one or more places on the printing platform, the driving module, and the connection between the printing platform and the driving module by means of screwing, welding, snapping, or gluing. For example, the collector 23 is a strain gauge, which is adhered to the cantilever connected to the printing platform through glue.

As an optional embodiment, the connection part between the printing platform and the driving module includes: a cantilever, the cantilever is connected to the driving module; a connecting piece, the first end of the connecting piece is connected to the cantilever; the connecting piece, the second end of the connecting piece is connected to the cantilever. The printing platform is connected; the collector 23 is arranged at one or more places among the printing platform, the cantilever and the connector; the collector 23 includes one or more, wherein at least one collector 23 is a strain gauge collector 23, and the strain gauge collector 23 The collector 23 is disposed on the printing platform, a cantilever or a connector, and the collector 23 is located on the vertical central axis of the printing platform. In this way, the installation position of the collector 23 is located on the central axis of the vertical direction of the printing platform, so that the installation position of the collector 23 has a stronger correlation with the entire printing platform, thereby enabling the collector 23 to have a greater impact on the printing platform. Force transmission and detection are more accurate.

Specifically, as shown in Figure 4, the collection device 3 (that is, the collector 23 described in some embodiments) can be disposed on the carrying platform 2 (that is, the printing platform described in some embodiments); refer to Figure 5 , the collection device 3 can be disposed on the support arm 41 (that is, the cantilever described in some embodiments); as shown in Figure 6 , the collection device 3 can be disposed on the connecting portion 42 (that is, the connector described in some embodiments) on, used to detect the tension value or pressure value of the bearing platform 2. Specifically, the collection device 3 can be arranged on the central axis of the vertical direction of the bearing platform 2 to improve the accuracy of the collection value of the collection device 3 . Wherein, the collection device 3 can be disposed on the carrying platform 2, the support arm 41 or the connecting part 42 in an adhesive manner.

As an optional embodiment, the strain gauge collector 23 includes: a strain gauge, which is arranged at one or more places among the printing platform, the driving module, and the connection between the printing platform and the driving module; force signal processing unit, the first end of the force signal processing unit is electrically connected to the strain gauge, and the force signal processing unit is used to process the force signal collected by the strain gauge; the light-curing three-dimensional printer also includes a main control module, the main control module and the force signal processing unit The second end is electrically connected, and the main control module is used to receive and obtain the current detection force value according to the processed force signal. The current detection force value is used to characterize the force of the printing platform of the light-curing three-dimensional printer.

Specifically, the strain gauge is used to sense the force signal at its setting position and send the force signal to a force signal processing unit connected thereto. The force signal processing unit is used to process the force signal collected by the strain gauge. The force signal processing unit can be It has filtering and other related components, circuits or chips.

Specifically, the collector 23 can be disposed on the printing platform; the collector 23 can be disposed on the cantilever; the collector 23 can be disposed on the connector for detecting the tension value or pressure value of the printing platform. Specifically, the collector 23 can be arranged on the central axis of the vertical direction of the printing platform to improve the accuracy of the values collected by the collector 23 . Wherein, the collector 23 can be disposed on the printing platform, cantilever or connector in an adhesive manner. In this way, the deformation of the installation position of the strain gauge can reflect the stress situation at the installation position, thereby reflecting the stress situation of the printing platform that is connected to the installation position.

As an optional embodiment, the driving module includes: a guide rail, which is arranged on the base; a slide block that cooperates with the guide rail and can slide relative to the guide rail; the slide block is directly or indirectly connected to the printing platform to drive The printing platform moves; the screw rod is passed through the slider; the motor is connected to one end of the screw rod to drive the slider to move along the guide rail; the collector 23 is arranged on the motor or between the motor and the screw rod; collection The collector 23 includes one or more, wherein: at least one collector 23 is a torque sensor, and the torque sensor is arranged between the motor and the screw rod; or at least one collector 23 is a current detection module, and the current detection module is used to detect the drive of the motor. current and determine the stress of the printing platform according to the driving current; at least one collector 23 is a collector 23 provided in the drive circuit, and the collector 23 can be the drive circuit itself, or the collector 23 can be the drive circuit force detection circuit in the. The force detection circuit detects the A circuit that converts a voltage signal or a circuit signal into a force value output by the motor. The drive circuit itself can also output a voltage signal or circuit signal in the drive circuit to convert the voltage signal or circuit signal into a force value output by the motor.

Specifically, in one embodiment, the collector 23 is a torque sensor. The torque sensor can be arranged between the motor and the screw rod, and the torque value between the motor and the screw rod can be detected by the torque sensor, thereby determining the stress on the printing platform. . It can be understood that the torque sensor can measure the output force of the motor, and the output force of the motor is generally consistent with the stress of the printing platform. Therefore, the force of the printing platform can be measured more accurately.

In one embodiment, the collector 23 can be a current detection module. The current detection module is used to detect the driving current of the motor and determine the stress of the printing platform based on the driving current. The collector 23 can be integrated inside the motor. In this way, by detecting the current of the driving motor of the printing platform, the force of the printing platform is reflected. It can be understood that the current can reflect the output force of the motor, and the output force of the motor is related to the force of the printing platform. Generally, they are corresponding, so the stress on the printing platform can be measured more accurately. Alternatively, the collector 23 can be a strain gauge, which is disposed on the motor or between the motor and the screw rod in an adhesive manner.

As an optional embodiment, the light-curing three-dimensional printer also includes: a material trough, which is provided on the base and located below the printing platform, for holding printing materials; and a light source, which is provided in the base and located below the material trough. Emit light to solidify the printing material in the trough; position detector. The position sensor includes a photoelectric sensor and a shielding piece. The shielding piece is directly or indirectly fixedly connected to the printing platform; the photoelectric sensor is set higher than or level with the printing material in the trough. The liquid level when the material is full; the position detector is used to send the first trigger signal when the shielding plate is not pressed down to the setting position of the photoelectric sensor, and to send the second trigger signal when the printing platform is pressed down to the setting position of the photoelectric sensor; processing The processor 22 can generate a corresponding motor speed regulation signal according to the received first trigger signal or the second trigger signal, and send the motor speed regulation signal to the drive module.

The luminous body may be an LCD light source, a DLP light source, an SLA light source, etc., which is not specifically limited in this application. For example, when the illuminant 62 (i.e., the light source described in some embodiments) is an LCD light source, the light-curing three-dimensional printer further includes an exposure screen, and the exposure screen is disposed in the material storage part 61 (i.e., the material trough described in some embodiments). ) and the luminous body 62. In a specific embodiment, as shown in FIG. 4 , the photoelectric sensor 63 is positioned higher than the liquid level when the printing material in the storage portion 61 is full. In this way, before the bearing platform is pressed down to the setting position of the photoelectric sensor 63, the bearing platform can be controlled to be pressed down at the first pressing speed; after the bearing platform is pressed down to the setting position of the photoelectric sensor 63, the bearing platform can be controlled to press the second pressing speed. The first pressing speed is greater than the second pressing speed. It can be understood that pressing down at a faster speed before the carrying platform reaches the setting position of the photoelectric sensor 63 and pressing down at a slower speed after reaching the setting position of the photoelectric sensor 63 can speed up the operation of the equipment. , to prevent the power parts from stalling due to the excessive resistance brought by the resin tension to the downward pressure of the bearing platform during the pressing process after reaching the set position of the photoelectric sensor 63, and to improve the safety of equipment operation. It should be noted that in some embodiments, the photoelectric sensor 63 may be disposed at a preset height higher than the liquid level when the printing material in the storage part 61 is full, and the preset height may be greater than or equal to what the device can print. Maximum model height, further increasing safety when printing models.

In the fourth aspect, please refer to Figure 3. Figure 3 is a schematic structural diagram of a printing control system provided by the present application. The printing control system includes: a detection module 31 for detecting the printing platform used to characterize the light-curing three-dimensional printer. The detected force value is used to obtain the current detected value; the first determination module 32 is used to determine the relationship between the current detected value and the preset value range. The system determines whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state; the processing module 33 is configured to output an abnormal prompt signal when the printing state of the light-curing three-dimensional printer is an abnormal state. The printing control system provided by this application has the same beneficial effects as the above printing control method.

In one embodiment, the printing platform assembly includes a printing platform (such as the load-bearing platform 2 described in some of the above embodiments) and a cantilever (such as the support arm 41 described in some of the above embodiments). Both sides of the cantilever are connected to lifts respectively. Components (such as guide rails, sliders, screws, and motors described in some of the above embodiments) and printing platforms, the 3D printer also includes strain gauges (such as the collection device 3 or collector 23 described in some of the above embodiments), Specifically, it can be an elastic resistance strain gauge. In some embodiments, the strain gauge may be disposed on the cantilever, specifically, it may be attached to the upper surface of the cantilever. In some other embodiments, the strain gauge can also be disposed on the printing platform, as long as the position where the force changes during the printing process of the lifting component can be detected.

Since the lifting assembly lifts and lowers the printing platform assembly with the partially formed model during the printing process, its stress conditions are different at different stages. For example: when the model is not separated from the release film, as it rises and falls, As the process proceeds, the pulling force of the release film becomes larger and larger. The stress situation is as follows: the gravity of the printing platform component, the pulling force of the release film, the gravity of the model and the liquid resin; when the model is separated from the release film, Since there is no tension on the release film, its stress situation is: it is jointly affected by the gravity of the printing platform component, the gravity of the model, and the liquid resin. By comparing the changes in the above stress situation, you can feel whether the printing is proceeding normally. .

Take the strain gauge installed on the cantilever as an example. The force on the printing platform will cause a slight change in the position of the printing platform, which will then pull the cantilever, causing the cantilever to deform slightly. By measuring the deformation of the cantilever, the stress on the printing platform can be obtained. In one embodiment, the strain gauge is a resistance strain gauge, and the resistance strain gauge is connected to a measurement circuit and a voltmeter. For example, the resistance strain gauge and the measurement circuit form a Wheatstone bridge. Detect the output voltage of the voltmeter, and through the relationship between the stress on the printing platform and the output voltage of the voltmeter, the stress on the printing platform can be obtained, such as calculating the corresponding force value, etc. Among them, the relationship between the stress on the printing platform and the output voltage of the voltmeter can be obtained in the following way: when the printer is not printing, when the printing platform is suspended statically, read the first output voltage of the voltmeter; fix it under the printing platform The experimental piece with known gravity. When the experimental piece is stationary, the experimental piece exerts the same pulling force as gravity on the printing platform, and reads the second output voltage of the voltmeter; calculates the voltage difference between the second output voltage and the first output voltage. Fix experimental pieces with different gravity below the printing platform, repeat the above process to obtain at least two sets of voltage differences and the gravity of the experimental piece, determine the relationship between the voltage difference and the gravity of the experimental piece, usually the voltage difference is proportional to the gravity of the experimental piece, and then get The relationship between the stress on the printing platform and the output voltage of the voltmeter. It can be understood that in the above-mentioned implementation of using a Wheatstone bridge to detect the stress on the printing platform, when the resistance strain gauge does not deform, the output voltage of the voltmeter is theoretically 0V. However, since the resistance strain gauge is arranged on the cantilever On the printing platform, the gravity of the printing platform will cause the resistance strain gauge to undergo initial deformation, causing the voltmeter to have the first output voltage.

It can be understood that various other methods can be used to obtain the force conditions of the printing platform components, such as arranging a detection device on the bottom surface of the printing platform for adhering to the model. In addition, strain gauges can also be installed on the release film to detect the stress on the release film, and then the success of the model detachment can be judged based on the stress on the release film.

It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or sequence between operations. Furthermore, the terms “includes,” “includes,” or any other variations thereof mean To cover non-exclusive inclusion, such that a process, method, article or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or that is intended to include such process, method, article or apparatus Elements inherent to the device. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or device that includes the stated element.

The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A printing control method, characterized in that the printing control method includes:

Detect the detection value used to characterize the force of the printing platform of the light-curing three-dimensional printer to obtain the current detection value;

According to the relationship between the current detection value and the preset value range, determine whether the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state;

When the printing state of the light-curing three-dimensional printer is the abnormal state, an abnormal prompt signal is output.
The printing control method according to claim 1, characterized in that, before determining that the printing state of the light-curing three-dimensional printer is a normal state or an abnormal state according to the relationship between the current detection value and the preset value range, the Print control methods also include:

According to the current printing stage of the printing platform, a preset value range corresponding to the current printing stage is determined; the current printing stage is the printing stage that the printing platform is currently in, and the printing stage includes a pressing stage and a pressing stage. Detachment stage; or

According to the current printing stage of the printing platform and the current layer area of the light-curing three-dimensional printer, the corresponding preset value range is determined; the current printing stage is the printing stage that the printing platform is currently in, and the printing stage It includes a pressing stage and a release stage; wherein the current layer area is determined by the exposure area of the most recent preset exposure of the model being printed.
The printing control method according to claim 2, wherein the abnormal state includes an abnormal state of abnormal release and an abnormal state of abnormal pressing, and is determined according to the relationship between the current detection value and the preset value range. The process of changing the printing state of the light-curing three-dimensional printer into a normal state or an abnormal state includes:

When the current printing stage is the release stage, and the current detection value is within the preset value range corresponding to the release stage, it is determined that the printing state of the light-curing three-dimensional printer is a normal state;

When the current printing stage is the release stage and the current detection value is outside the preset value range corresponding to the release stage, it is determined that the printing state of the light-curing three-dimensional printer is abnormal release. The abnormal state of the printing platform is controlled to perform reaction actions corresponding to the abnormal state of the abnormal release;

When the current printing stage is the pressing stage, and the current detection value is within the preset value range corresponding to the pressing stage, it is determined that the printing state of the light-curing three-dimensional printer is a normal state;

When the current printing stage is the pressing stage and the current detection value is outside the preset value range corresponding to the pressing stage, it is determined that the printing state of the light-curing three-dimensional printer is pressing abnormality. The abnormal state of the printing platform is controlled to perform a reaction action corresponding to the abnormal state of the abnormal pressing.
The printing control method according to claim 3, characterized in that the abnormal state of abnormal release includes the abnormal state of model fault, the abnormal state of model fracture and the abnormal state of excessive release force of the current printing layer; control all The process of the printing platform executing reaction actions corresponding to the abnormal state of the abnormal release includes:

When the current detection value is in the first abnormal value range, it is determined that the printing state of the light-curing three-dimensional printer is an abnormal state of the model fault, the printing platform is controlled to be pressed back to the preset exposure position, and the The light source of the light-curing three-dimensional printer re-exposes and solidifies the current printing layer with the first exposure parameter to perform supplementary printing on the current printing layer; the first abnormal value range is less than the first preset value. value range;

When the current detection value is in the second abnormal value range, determine the printing status of the light-curing three-dimensional printer In the abnormal state of model breakage, the printing platform is controlled to be pressed back to the preset exposure position, and the light source of the light-curing three-dimensional printer is controlled to expose and cure the current printing layer again with the second exposure parameter, so as to The current printing layer performs supplementary printing; the second abnormal value range is a value range greater than the first preset value and less than the second preset value, and the second preset value is greater than the first preset value. Set the value; wherein the exposure duration of the first exposure parameter is longer than the exposure duration of the second exposure parameter, and/or the exposure intensity of the first exposure parameter is stronger than the exposure intensity of the second exposure parameter;

When the current detection value is in the third abnormal value range, it is determined that the printing state of the light-curing three-dimensional printer is an abnormal state in which the release force of the current printing layer is too large, and the printing platform is controlled to decelerate and lift, stop moving, Press down a preset distance or press down a preset distance after stopping movement; the third abnormal value range is a value range greater than the third preset value, and the third preset value is greater than the second preset value .
The printing control method according to claim 3, characterized in that the process of controlling the printing platform to perform reaction actions corresponding to the abnormal state of the abnormal pressing includes:

Determine whether the current detection value is greater than or equal to the safety threshold;

If the current detection value is less than the safety threshold, control the printing platform to decelerate and press down;

If the current detection value is greater than or equal to the safety threshold, the printing platform is controlled to stop moving, or the printing platform is controlled to move up, or the printing platform is controlled to stop moving and then move up.
The printing control method according to claim 1, wherein the detection value is used to characterize the force of the printing platform of the light-curing three-dimensional printer, and the process of obtaining the current detection value includes:

The collection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is collected by the collector to obtain the current collection value; wherein, the collector is a strain gauge, and the strain gauge is set at one or more of the following locations : On the cantilever of the printing platform, on the connection between the printing platform and the cantilever of the printing platform, on the printing platform; or, the collector is a torque sensor, and the torque sensor is arranged on the printing platform. Between the drive motor of the platform and the screw rod; or, the collector is a current collector, and the current collector is arranged in the drive motor of the printing platform or in the drive circuit corresponding to the drive motor of the printing platform;

The current detection value corresponding to the current collection value is determined according to the current collection value.
The printing control method according to claim 6, wherein the process of determining the current detection value corresponding to the current collection value according to the current collection value includes:

Use the current collection value as the current detection value; or:

Obtain a preset mapping relationship corresponding to the type and setting position of the collector; the preset mapping relationship is a preset mapping relationship between the current detection value and the current collection value of the collector;

The current detection value is obtained based on the current collection value and the preset mapping relationship.
The printing control method according to claim 6, wherein the collector at least includes a main collector and an auxiliary collector, and the main collector and the auxiliary collector are located at different installation positions; The collection value used to characterize the force of the printing platform of the light-curing 3D printer is collected through a collector. The process of obtaining the current collection value includes:

Through the main collector, the collection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is collected at the setting position of the main collector to obtain the main collection value;

Through the auxiliary collector, the collection value used to characterize the force of the printing platform of the light-curing three-dimensional printer is collected at the setting position of the auxiliary collector to obtain the auxiliary collection value;

Determine whether the main collection value is valid based on the auxiliary collection value;

If so, use the main collection value as the current collection value;

If not, use the auxiliary collection value as the current collection value.
The printing control method according to claim 8, wherein the determining whether the main collection value is valid based on the auxiliary collection value includes:

Determine the first collection value range where the main collection value is located and the second collection value range where the auxiliary collection value is located;

Determine whether the first collection value range and the second collection value range match the same printing state;

If so, determine that the main collection value is valid;

or,

Based on the main collection value and the historical main collection value of the main collector, determine the first fluctuation value corresponding to the main collection value;

Based on the auxiliary collection value and the historical auxiliary collection value of the auxiliary collector, determine the second fluctuation value corresponding to the auxiliary collection value;

When the difference between the first fluctuation value and the second fluctuation value is less than the preset difference, it is determined that the main acquisition value is valid;

When the difference between the first fluctuation value and the second fluctuation value is greater than the preset difference, the main collector and the auxiliary collector are determined based on the setting position of the main collector and the setting position of the auxiliary collector. The effective priority of the auxiliary collector. If the effective priority of the main collector is higher than the effective priority of the auxiliary collector, it is determined that the main collection value is valid; otherwise, it is determined that the main collection value is invalid;

or,

The collector includes at least one main collector and at least two auxiliary collectors;

When the first change amount corresponding to the main acquisition value exceeds the preset change amount, determine whether there are at least two second change amounts corresponding to the auxiliary acquisition values, both of which exceed the preset change amount;

If so, it is determined that the main collection value is valid.
The printing control method according to claim 1, wherein the detection value is used to characterize the force of the printing platform of the light-curing three-dimensional printer. After obtaining the current detection value, the printing control method further includes:

Upload the current printing data to the remote device according to the preset time interval;

Wherein, the printing data at the current moment includes the current detection value at the current moment, the printing stage at the current moment, and the exposure parameters at the current moment; the exposure parameters include the exposure image area, exposure duration and exposure intensity; so that the The cloud server analyzes and optimizes the received printing data to obtain optimized motor driving speed and/or optimized model slicing information.
The printing control method according to any one of claims 1-10, characterized in that the printing control method further includes:

When printing the first layer of the model to be printed, control the downward pressure of the printing platform until the current detection value reaches a preset threshold, and determine the position of the printing platform at this time as the target position;

Control the printing platform to continue pressing down a preset distance from the target position, and use the stroke position of the motor at this time as the zero point position of the motor, and control the light source exposure of the light-curing three-dimensional printer to cure the to-be-printed The first printed layer of the model.
The printing control method according to claim 11, wherein the process of controlling the printing platform to press down until the current detection value reaches a preset threshold includes:

Before the printing platform is pressed down to the first preset position, control the printing platform to be pressed down at a first pressing speed;

After the printing platform is pressed down to the first preset position, the printing platform is controlled to be pressed down at a second pressing speed; the first pressing speed is greater than the second pressing speed, and the third pressing speed is A preset position is higher than or equal to the liquid level when the printing material in the material tank of the light-curing three-dimensional printer is full.
The printing control method according to any one of claims 1 to 10, characterized in that the detection value is used to characterize the force of the printing platform of the light-curing three-dimensional printer. After obtaining the current detection value, the printing control Methods also include:

Generate a report on the force changes of the printing platform during the model printing process according to the detection value detected during the model printing process;

After the model printing is completed, the report is output to a preset storage space, and a prompt that the report is completed is output.
A readable storage medium, characterized in that a computer program is stored on the readable storage medium, and when the computer program is executed by a processor, the steps of the printing control method according to any one of claims 1-13 are implemented. .
A light-curing three-dimensional printer is characterized by including:

Memory, used to store computer programs;

A processor, configured to implement the steps of the printing control method according to any one of claims 1-13 when executing the computer program;

At least one collector is provided on the light-curing three-dimensional printer. The collector is used to sense the current collection value at the setting position of the collector and send the current collection value to the processor to obtain The current detection value; the current collection value can reflect the force of the printing platform.