Printing method and 3D printer

Abstract

The invention provides a printing method and a 3D printer, the method is applied to a forming module, the forming module forms a containing cavity and comprises a light-transmitting assembly arranged on one side of the containing cavity and a forming platform arranged opposite to the light-transmitting assembly, the containing cavity is used for containing a printing material, and the containing cavity comprises a forming cavity located between the forming platform and the light-transmitting assembly; the forming platform can move towards or away from the light-transmitting assembly. The method comprises the steps that the forming platform is controlled to move away from the light-transmitting assembly, and release is conducted when the air pressure of the containing cavity is higher than environment air pressure. The forming platform is controlled to move, and the containing cavity is used for boosting to assist release, so that the release force is effectively reduced, damage to a printing layer is reduced, the printing success rate and precision are improved, and the printing efficiency and the process stability are improved.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more particularly to a printing method and a 3D printer. Background Technology

[0002] In traditional photopolymer 3D printing, the release process mainly relies on mechanical means to overcome the adhesion between the cured layer and the printing material. This direct mechanical separation method is not only difficult to release, but also easily causes the printed layer to deform or be damaged during peeling, thus affecting the molding accuracy and success rate. Summary of the Invention

[0003] The printing method and 3D printer provided in this application solve the technical problems of existing 3D printing release processes that rely on mechanical separation, which not only makes release difficult but also causes deformation or damage to the printed layer during peeling, affecting molding accuracy and success rate.

[0004] In a first aspect, this application provides a printing method applied to a molding module, the molding module forming a receiving cavity, the molding module including a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component, the receiving cavity being used to receive printing material, the receiving cavity including a molding cavity located between the molding platform and the light-transmitting component, the molding platform being movable toward or away from the light-transmitting component; the method includes:

[0005] The molding platform is controlled to move away from the light-transmitting component and the air pressure in the receiving cavity is made higher than the ambient air pressure.

[0006] One possible design also includes:

[0007] Release: Control the molding platform to move away from the light-transmitting component and make the air pressure in the receiving cavity higher than the ambient air pressure;

[0008] After the release process is completed, the molding platform is controlled to move to the next printing position for photocuring to form a printed layer attached to the molding platform.

[0009] In one possible design, the method includes:

[0010] After the release process is completed, the air pressure in the receiving cavity is made equal to the ambient air pressure.

[0011] In one possible design, the method further includes:

[0012] The molding platform is controlled to move away from the light-transmitting component by pneumatic and / or mechanical drive.

[0013] In one possible design, the pneumatically driven control of the molding platform to move away from the light-transmitting component includes:

[0014] The air pressure in the receiving cavity is controlled to increase, so that the air pressure in the receiving cavity is higher than the ambient air pressure, thereby generating a driving force on the molding platform away from the light-transmitting component.

[0015] In one possible design, controlling the increase of the gas pressure in the containment cavity includes:

[0016] The gas pump is controlled by a gas pressure control algorithm to inject gas into the receiving cavity, thereby increasing the gas pressure in the receiving cavity.

[0017] In one possible design, the method further includes:

[0018] The pressure in the cavity is reduced by releasing gas through a pressure relief valve.

[0019] In one possible design, the method further includes:

[0020] The real-time air pressure of the receiving cavity is detected by an air pressure sensor;

[0021] Based on the aforementioned air pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time air pressure and the first target air pressure.

[0022] In one possible design, controlling the air pump to inject gas into the receiving cavity based on the air pressure control algorithm and the difference between the real-time air pressure and the first target air pressure includes:

[0023] Based on the difference between the real-time air pressure and the first target air pressure, the drive signal of the air pump is dynamically adjusted according to the proportional-integral-derivative algorithm.

[0024] The drive signal controls the air pump to inject gas into the receiving cavity, and the drive signal is used to control the speed and / or output power of the air pump.

[0025] In one possible design, controlling the air pump to inject gas into the receiving cavity based on the air pressure control algorithm and the difference between the real-time air pressure and the first target air pressure includes:

[0026] Based on the difference between the real-time air pressure and the first target air pressure, the start and stop of the air pump are controlled by a pulse control algorithm to generate multiple inflation pulses.

[0027] The gas pump is controlled to inject gas into the receiving cavity according to the plurality of inflation pulses.

[0028] In one possible design, before the gas pump is controlled to inject gas into the receiving cavity based on the gas pressure control algorithm, the method further includes:

[0029] The first target air pressure is obtained by scanning the identification unit located on the molding module. The identification unit is used to uniquely identify the printing material.

[0030] In one possible design, scanning the identification unit located on the molding module to obtain the first target air pressure includes:

[0031] The preset fixed air pressure value obtained from the information obtained by scanning the identification unit is determined as the first target air pressure; or

[0032] The printing parameters are obtained by scanning the identification unit, and the first target air pressure is determined based on the printing parameters. The printing parameters include at least one of the material property parameters of the printing material, printing process parameters, and printing environment parameters.

[0033] In one possible design, the method further includes:

[0034] The control parameters for the pulse control algorithm in the air pressure control algorithm are generated based on the printing parameters. The control parameters include at least one of the following: pulse air pressure value, inflation duration of a single inflation pulse, and inflation sequence.

[0035] In one possible design, the first target air pressure is higher than the ambient air pressure and less than or equal to the maximum inflation pressure of the air pump.

[0036] In one possible design, the method further includes:

[0037] If the real-time air pressure exceeds the preset air pressure threshold, the pressure relief valve controls the release of gas from the containment chamber, causing the air pressure in the containment chamber to decrease.

[0038] Secondly, this application provides a printing apparatus for use in a 3D printing system. The 3D printing system includes a molding module, which forms a receiving cavity. The molding module includes a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component. The receiving cavity is used to receive printing material. The receiving cavity includes a molding cavity located between the molding platform and the light-transmitting component. The molding platform is movable toward or away from the light-transmitting component. The apparatus includes:

[0039] The control module is used to control the movement of the molding platform away from the light-transmitting component and to make the air pressure in the receiving cavity higher than the ambient air pressure.

[0040] In one possible design, the control module is further configured to:

[0041] Release: Control the molding platform to move away from the light-transmitting component and make the air pressure in the receiving cavity higher than the ambient air pressure;

[0042] After the release process is completed, the molding platform is controlled to move to the next printing position for photocuring to form a printed layer attached to the molding platform.

[0043] In one possible design, the control module is further configured to:

[0044] After the release process is completed, the air pressure in the receiving cavity is made equal to the ambient air pressure.

[0045] In one possible design, the control module is further configured to:

[0046] The molding platform is controlled to move away from the light-transmitting component by pneumatic and / or mechanical drive.

[0047] In one possible design, the control module is further configured to:

[0048] The air pressure in the receiving cavity is controlled to increase, so that the air pressure in the receiving cavity is higher than the ambient air pressure, thereby generating a driving force on the molding platform away from the light-transmitting component.

[0049] In one possible design, the control module is further configured to:

[0050] The gas pump is controlled by a gas pressure control algorithm to inject gas into the receiving cavity, thereby increasing the gas pressure in the receiving cavity.

[0051] In one possible design, the control module is further configured to:

[0052] The pressure in the cavity is reduced by releasing gas through a pressure relief valve.

[0053] In one possible design, the control module is further specifically used for:

[0054] The real-time air pressure of the receiving cavity is detected by an air pressure sensor;

[0055] Based on the aforementioned air pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time air pressure and the first target air pressure.

[0056] In one possible design, the control module is further configured to:

[0057] Based on the difference between the real-time air pressure and the first target air pressure, the drive signal of the air pump is dynamically adjusted according to the proportional-integral-derivative algorithm.

[0058] The drive signal controls the air pump to inject gas into the receiving cavity, and the drive signal is used to control the speed and / or output power of the air pump.

[0059] In one possible design, the control module is further configured to:

[0060] Based on the difference between the real-time air pressure and the first target air pressure, multiple inflation pulses are generated by controlling the start and stop of the air pump using a pulse control algorithm.

[0061] The gas pump is controlled to inject gas into the receiving cavity according to the plurality of inflation pulses.

[0062] In one possible design, the device further includes: a scanning module; the scanning module is used for:

[0063] The first target air pressure is obtained by scanning the identification unit located on the molding module. The identification unit is used to uniquely identify the printing material.

[0064] In one possible design, the scanning module is further used for:

[0065] The preset fixed air pressure value obtained from the information obtained by scanning the identification unit is determined as the first target air pressure; or

[0066] The printing parameters are obtained by scanning the identification unit, and the first target air pressure is determined based on the printing parameters. The printing parameters include at least one of the material property parameters of the printing material, printing process parameters, and printing environment parameters.

[0067] In one possible design, the control module is further configured to:

[0068] The control parameters for the pulse control algorithm in the air pressure control algorithm are generated based on the printing parameters. The control parameters include at least one of the following: pulse air pressure value, inflation duration of a single inflation pulse, and inflation sequence.

[0069] In one possible design, the first target air pressure is higher than the ambient air pressure and less than or equal to the maximum inflation pressure of the air pump.

[0070] In one possible design, the control module is further configured to:

[0071] If the real-time air pressure exceeds the preset air pressure threshold, the pressure relief valve controls the release of gas from the containment chamber, causing the air pressure in the containment chamber to decrease.

[0072] Thirdly, this application provides a 3D printer, including: a memory and a processor;

[0073] The memory stores computer-executed instructions;

[0074] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0075] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0076] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0077] This application provides a printing method and a 3D printer. The method is applied to a molding module, which has a receiving cavity. The molding module includes a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component. The receiving cavity is used to receive printing material and includes a molding chamber located between the molding platform and the light-transmitting component. The molding platform can move towards or away from the light-transmitting component. The method includes: controlling the molding platform to move away from the light-transmitting component and making the air pressure in the receiving cavity higher than the ambient air pressure for release. By controlling the movement of the molding platform and increasing the pressure in the receiving cavity to assist release, the release force is effectively reduced, thereby reducing damage to the printed layer, improving printing success rate and accuracy, and helping to improve printing efficiency and process stability. Attached Figure Description

[0078] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0079] Figure 1 A schematic diagram of the pre-printing molding module provided in this application;

[0080] Figure 2 for Figure 1 Cross-sectional view of the shaped module after printing;

[0081] Figure 3 Flowchart of the printing method provided in this application Figure 1 ;

[0082] Figure 4 Flowchart of the printing method provided in this application Figure 2 ;

[0083] Figure 5 for Figure 1 Top view of the Z-axis cantilever;

[0084] Figure 6 A schematic diagram of the gas passage for the 3D printer provided in this application;

[0085] Figure 7 Flowchart of the printing method provided in this application Figure 3 ;

[0086] Figure 8 Flowchart of the printing method provided in this application Figure 4 ;

[0087] Figure 9 Schematic diagram of the printing apparatus provided in this application Figure 1 ;

[0088] Figure 10 Schematic diagram of the printing apparatus provided in this application Figure 2 ;

[0089] Figure 11 A schematic diagram of the structure of the 3D printer provided in this application.

[0090] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0091] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0092] In traditional photopolymer 3D printing, the release process mainly relies on mechanical means to overcome the adhesion between the cured layer and the printing material. This direct mechanical separation method is not only difficult to release and has low release efficiency, but it also easily causes the printed layer to deform or be damaged during peeling, thus affecting the molding accuracy and success rate.

[0093] To address the aforementioned problems in the existing technology, this application provides a printing method and a 3D printer. The inventive concept of the printing method provided in this application lies in controlling the movement of the forming platform away from the light-transmitting component and making the air pressure in the receiving cavity higher than the ambient air pressure. This concept can be used for printing and also for stirring.

[0094] Printing process: The increased air pressure inside the cavity creates a pressure difference between the inside and outside, which in turn creates a driving force on the forming platform to move away from the light-transmitting component, thus driving the forming platform to move away from the light-transmitting component for demolding. The increased air pressure inside the cavity acts on the printing material, the current printing layer, and the light-transmitting component, improving the demolding ability between the current printing layer and the light-transmitting component, and achieving a smoother, faster, and less damaging demolding.

[0095] Stirring process: The increased air pressure inside the containment cavity creates a pressure difference between the inside and outside, which in turn creates a driving force on the forming platform that moves away from the light-transmitting component. This drives the forming platform to move away from the light-transmitting component to stir the material, making the printing material uniform. The increased air pressure inside the containment cavity makes the printing material flow faster and the stirring efficiency higher.

[0096] This application provides a printing method, which is applied to a molding module, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the pre-printing molding module provided in this application. Figure 2 for Figure 1 Cross-sectional view of the shaped module after printing, as shown Figure 1 and Figure 2 As shown, the molding module 200 has a receiving cavity 201 for receiving printing material. The molding module 200 includes a light-transmitting component 2011 disposed on one side of the receiving cavity 201 and a molding platform 202 disposed opposite to the light-transmitting component 2011. The receiving cavity 201 includes a molding cavity 2012 located between the molding platform 202 and the light-transmitting component 2011. The molding platform 202 can move toward or away from the light-transmitting component 2011. The molding platform 202 includes a pressure-bearing surface, which is the cavity wall of the receiving cavity 201. The pressure-bearing surface intersects with the movement direction of the molding platform 202, and is preferably arranged perpendicularly.

[0097] During printing, after the photocuring of the current printed layer is completed, the forming platform 202 moves away from the light-transmitting component 2011 (i.e., piston movement) to release the material. The printing material in the receiving cavity 201 flows into the space between the bottom of the forming platform 202 and the light-transmitting component 2011. After release, the forming platform 202 is controlled to move towards the light-transmitting component 2011 to the next printing position. Then, the optomechanical module is controlled to project light onto the light-transmitting component 2011. The light passes through the light-transmitting component 2011, exposing the printing material. The printing material in the forming cavity 2012 photocures to form a printed layer, which adheres to the forming platform 202. This process is repeated to achieve layer-by-layer printing, forming the printed part 300.

[0098] After the current printed layer is exposed to light and the printing material is photocured to form the current printed layer, the forming platform 202 moves away from the light-transmitting component 2011, that is, it moves upward along the Z-axis. The forming platform 202 will then cause the formed printed layer to separate from the light-transmitting component 2011. This is the release process in 3D printing.

[0099] In some embodiments, the molding platform 202 can be integrated into the molding module 200, and the molding module 200 can also be assembled and used via the molding platform 202, including ready-to-use assembly. The receiving cavity 201 can be integrally disposed in the molding module 200, or it can be a cavity formed after the molding platform 202 is assembled into the molding module 200; this application does not limit this.

[0100] Figure 3 Flowchart of the printing method provided in this application Figure 1 ,like Figure 3 As shown, the method includes:

[0101] S101, Demolding: Control the molding platform to move away from the optical engine module and make the air pressure in the receiving cavity higher than the ambient air pressure to perform demolding.

[0102] S102. After the release is completed, control the molding platform to move to the next printing position for photocuring to form a printing layer attached to the molding platform.

[0103] The molding platform 202 is controlled to move away from the light-transmitting component 2011, causing the air pressure in the receiving cavity 201 to increase for demolding. For example... Figure 2 The forming platform 202 shown moves away from the light-transmitting component 2011 and increases the air pressure in the receiving cavity 201, for example, by increasing the air pressure in the receiving cavity 201 to be higher than the ambient air pressure.

[0104] When the air pressure in the receiving cavity 201 increases, the air pressure inside the receiving cavity 201 is higher than the ambient air pressure. The internal air pressure on the forming platform 202 and the light-transmitting component 2011 is greater than the ambient air pressure. Furthermore, as the forming platform 202 moves away from the light-transmitting component 2011, the higher air pressure allows the printing material to flow more quickly between the forming platform 202 and the light-transmitting component 2011. This transforms the release process from the traditional mechanical rigid pulling to a separation method that combines mechanical and pneumatic methods. During the release process, the forming platform 202 can smoothly peel off the solidified printing layer from the light-transmitting component 2011.

[0105] After the release is completed, the molding platform 202 moves toward the light-transmitting component 2011 to the next printing position. The optomechanical module of the 3D printer projects light onto the light-transmitting component 2011, and the printing material in the molding cavity 2012 is exposed and cured to form the next printing layer attached to the molding platform 202 (usually the first printing layer is directly attached to the molding platform 202, and the non-first printing layer is indirectly attached to the molding platform 202 through the previous printing layer).

[0106] In some embodiments, after release, the pressure in the receiving cavity 201 is released so that the air pressure in the receiving cavity 201 is equal to or higher than the ambient air pressure. For example, after release, the air pressure in the receiving cavity 201 during the movement of the molding platform 202 toward the light-transmitting component 2011 and during photocuring can be equal to or higher than the ambient air pressure. In actual working conditions, after release, the printing effect of the molding platform 201 moving toward the light-transmitting component 2011 and photocuring when the air pressure in the receiving cavity 201 is equal to the ambient air pressure is better than the printing effect of the molding platform 201 moving to the next printing position and photocuring when the air pressure in the receiving cavity 201 is higher than the ambient air pressure.

[0107] It is worth understanding that the ambient air pressure described in the embodiments of this application refers to the air pressure outside the containment cavity 201, which is usually atmospheric pressure.

[0108] Additionally, it should be noted that the attachment of the printed layer to the molding platform 202 includes both direct and indirect attachment. The first printed layer is directly attached to the molding platform 202, while non-first layers are attached to the previous printed layer, which is indirect attachment to the molding platform 202.

[0109] The printing method provided in this application is applied to a molding module, which has a receiving cavity for accommodating printing material. The molding module includes a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component. The receiving cavity includes a molding cavity located between the molding platform and the light-transmitting component. The molding platform is capable of moving toward or away from the light-transmitting component.

[0110] The method includes: Release: Controlling the forming platform to move away from the light-transmitting component and increasing the air pressure in the receiving cavity to be higher than the ambient air pressure for release. After release, controlling the forming platform to move towards the light-transmitting component to the next printing position, controlling the optomechanical module to project light, causing the printing material to photocur and form a printing layer attached to the forming platform. By controlling the movement of the forming platform and using the pressure increase in the receiving cavity to assist release, the release force is effectively reduced, thereby reducing damage to the printing layer, improving printing success rate and accuracy, and helping to improve printing efficiency and process stability.

[0111] Specifically: Release: Control the molding platform to move away from the light-transmitting component by a preset distance and increase the air pressure in the receiving cavity to the first preset air pressure for release; After release, control the molding platform to move toward the light-transmitting component to the next printing position and depressurize the receiving cavity to the ambient air pressure for photocuring.

[0112] The method includes: stirring; controlling the forming platform to move away from the light-transmitting component and making the air pressure in the receiving cavity higher than the ambient air pressure; controlling the forming platform to move towards the light-transmitting component to the next printing position. By controlling the movement of the forming platform, the air pressure in the receiving cavity increases, creating an internal and external pressure difference, which generates a driving force on the forming platform to move away from the light-transmitting component, driving the forming platform to move away from the light-transmitting component for stirring, making the printing material uniform, and the increased air pressure in the receiving cavity makes the printing material flow faster and the stirring efficiency higher.

[0113] Specifically: stirring: controlling the molding platform to move away from the light-transmitting component to the first target position and increasing the air pressure in the receiving cavity to the second preset air pressure; controlling the molding platform to move towards the light-transmitting component to the second target position and depressurizing the receiving cavity to the ambient air pressure.

[0114] In some embodiments, the molding platform 202 is controlled to move away from the light-transmitting component 2011 by pneumatic and / or mechanical drive.

[0115] The movement of the molding platform 201 away from the light-transmitting component 2011 controlled by air pressure may include:

[0116] The receiving cavity 201 is a sealed cavity. The air pressure in the receiving cavity 201 can be controlled by increasing the pressure, for example, by inflating the receiving cavity 2011. This increases the air pressure and creates a driving force that propels the forming platform 202 away from the light-transmitting component 2011. Under this driving force, the forming platform 202 can move away from the light-transmitting component 2011. The target position of the forming platform 202 is determined by the cantilever of the 3D printer. The forming module 200 is installed on the 3D printer, and the forming platform 202 is located between the cantilever and the light-transmitting component 2011. The cantilever is connected to a motor drive, which drives its movement and achieves precise position control. The cantilever moves a preset distance or stops at a preset position, and the forming platform 202 stops after being limited by the cantilever at a preset distance or position, thus achieving precise movement. Inflating the receiving cavity 201 allows the air pressure in the receiving cavity 201 to be higher than the ambient air pressure.

[0117] Controlling the movement of the molding platform 201 toward the light-transmitting component 2011 includes: controlling the movement of the cantilever toward the light-transmitting component 2011, pushing the molding platform 202 toward the light-transmitting component 2011, and depressurizing the receiving cavity 201. Preferably, the air pressure in the receiving cavity 201 is equal to the ambient air pressure, thereby reducing the resistance of the molding platform 202 moving toward the light-transmitting component 2011 and also preventing the receiving cavity 201 from being under continuous high pressure.

[0118] It should be noted that the movement of the molding platform 202 is controlled by air pressure. That is, by inflating the receiving cavity 202, the molding platform 202 can be controlled to move away from the light-transmitting component 2011 and the air pressure in the receiving cavity 201 can be higher than the ambient air pressure. Of course, the air pressure driving force formed on the molding platform 202 must not be less than the minimum force that makes the molding platform 202 move.

[0119] In some embodiments, it can be achieved through, as shown in Figure 2 The air pump 100 shown in the diagram inflates the receiving cavity 201, thereby increasing the air pressure in the receiving cavity 201.

[0120] In some embodiments, controlling the movement of the molding platform away from the light-transmitting component 1 by mechanical drive may include:

[0121] The cantilever of the 3D printer is fixedly connected to the forming platform. The movement of the cantilever drives the movement of the forming platform. For example, the movement of the cantilever away from the light-transmitting component causes the forming platform to move away from the light-transmitting component, and the movement of the cantilever toward the light-transmitting component causes the forming platform to move toward the light-transmitting component.

[0122] Specifically, the drive motor rotates, driving the cantilever to move away from the light-transmitting component via a transmission assembly, which in turn drives the molding platform to move away from the light-transmitting component. When the cantilever stops moving at the target position or after a target distance, the molding platform also stops, completing a precise movement at a preset distance or position. The drive motor reverses, driving the cantilever towards the light-transmitting component via the transmission assembly. The cantilever then drives the molding platform towards the light-transmitting component, stopping at the target position or after a target distance, and the molding platform also stops, completing a precise movement at a preset distance or position. In this way, the molding platform can precisely move away from the light-transmitting component a preset distance for release, or precisely move towards the light-transmitting component to the next printing position for curing; the molding platform can precisely move away from the light-transmitting component to the first target position, or precisely move towards the light-transmitting component to the second target position, and can also reciprocate for stirring.

[0123] Optionally, the molding platform can also be controlled to move away from the light-transmitting component using a combination of pneumatic and mechanical drives. For example, the molding platform can be controlled to move away from the light-transmitting component 2011 under the combined action of pneumatic and mechanical drives. In this embodiment, the sum of the pneumatic driving force and the mechanical driving force acting on the molding platform is not less than the minimum force required to move the molding platform. The molding platform is driven towards the light-transmitting component by a cantilever.

[0124] Figure 4 Flowchart of the printing method provided in this application Figure 2 ,like Figure 4 As shown, the method includes:

[0125] S201. Based on the air pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity, so that the air pressure in the receiving cavity is higher than the ambient air pressure and forms a driving force on the molding platform away from the light-transmitting component.

[0126] Reference Figure 2 As shown, the 3D printer includes an air pump 100. After the photopolymerization of the current printing layer is completed, before or simultaneously with the movement of the forming platform 202 away from the light-transmitting component 2011, the air pump 100 is controlled by an air pressure control algorithm to inject gas into the receiving cavity 201, causing the air pressure in the receiving cavity 201 to rise above the ambient air pressure. This creates a driving force on the forming platform 202 to move away from the light-transmitting component 2011. Under the action of this driving force, the forming platform 202 is driven to move away from the light-transmitting component 2011. The moving target distance of the forming platform 202 stops at the limit of the cantilever of the 3D printer, completing the demolding.

[0127] The molding platform 202 is also provided with a vent 2022 that communicates with the receiving cavity 201, through which gas can be injected into the receiving cavity 201.

[0128] In some embodiments, the gas pressure control algorithm can precisely control the gas injection process, solving the problems of large pressure fluctuations and low control accuracy in the prior art, and ensuring gas pressure stability. Furthermore, when the forming platform 202 moves away from the light-transmitting component 2011, the gap between the current printed layer of the formed print and the light-transmitting component 2011 increases, and the printing material flows to fill this gap. The bottom of the forming platform 202 is the current printed layer of the formed print. Since conventional printing materials are relatively viscous and have poor fluidity, relying on natural flow would require a certain amount of time to prepare for the next exposure. However, when gas is injected into the receiving cavity 201, the printing material flows faster under the action of gas pressure, which can quickly fill the corresponding gaps, shorten the inter-layer printing time, and improve printing efficiency.

[0129] Furthermore, under air pressure, the printing material quickly fills the gap between the bottom of the molding platform 202 and the light-transmitting film 2011 to provide printing material for the next printing layer. It can also replace the traditional communicating vessel structure and achieve miniaturization of the printer device through a receiving cavity 201.

[0130] S202. After the release is completed, control the molding platform to move to the next printing position, control the photomechanical module to project light, so that the printing material is photocured to form a printing layer attached to the molding platform.

[0131] After the release is completed, the molding platform 202 moves toward the light-transmitting component 2011 to the next printing position. The optomechanical module projects light onto the light-transmitting component 2011. The light passes through the light-transmitting component 2011 to the molding cavity 2012. Under the action of the light, the printing material flowing into the molding cavity 2012 between the already formed printing layer and the light-transmitting component 2011 is photocured during the release process, forming the next printing layer attached to the molding platform 202.

[0132] In some embodiments, the movement of the molding platform 202 away from the light-transmitting component 2011 can be synchronized with the inflation of the receiving cavity 201, or it can be performed after the air pressure in the receiving cavity 201 is higher than the ambient air pressure; this application does not limit this. The movement of the molding platform 202 toward the light-transmitting component 2011 can be synchronized with the depressurization of the receiving cavity 201, or one can occur before the other; this application does not limit this, as long as it is ensured that depressurization has been completed during photocuring.

[0133] The printing method provided in this application uses a pneumatic control algorithm to control an air pump to inject gas into a cavity, increasing the pressure within the cavity to exceed the ambient pressure and creating a driving force that propels the molding platform away from the light-transmitting component. Specifically, controlling the air pump to inflate the cavity using the pneumatic control algorithm achieves precise pressure control, ensuring pressure stability and overcoming pressure control deficiencies. Furthermore, during the release process, the printing material within the cavity can be rapidly filled under pneumatic pressure, shortening the interlayer printing time and improving printing efficiency.

[0134] In some embodiments, gas is injected into the receiving cavity, making the gas pressure in the cavity higher than the ambient gas pressure. The light-transmitting component, such as the light-transmitting film, can undergo elastic deformation under a downward force, for example, it may bulge slightly downwards. The already formed printed layer will be driven upwards as the forming platform moves away from the optomechanical module. Under the action of the upward driving force, combined with the elastic deformation of the light-transmitting film, a gap appears between the light-transmitting film and the current printed layer of the already formed printed part due to the bulging of the light-transmitting film. This reduces the force required for the current printed layer to separate from the light-transmitting film during the release process, i.e., the release force, making it easier for the current printed layer to detach from the light-transmitting film and effectively reducing the release force.

[0135] In some embodiments, gas is injected into the receiving cavity, and the injected gas exerts a positive pressure on the surface of the liquid printing material within the receiving cavity. This pressure forces the printing material to actively and rapidly penetrate the interface between the separating current printed layer and the light-transmitting component. In other words, under the action of positive pressure, printing material actively and rapidly penetrates between the current printed layer and the light-transmitting component, forming a fluid lubrication layer.

[0136] The presence of the fluid lubrication layer effectively counteracts some of the vacuum adsorption force and reduces the direct adhesion force between the solid and the film, lowering the force required for the current printed layer to separate from the transparent film. This makes the peeling process easy and smooth, achieving flexible separation and greatly improving the stability and success rate of the printing process, effectively preventing the film from falling off. Furthermore, the smooth release process reduces the impact and stress on the Z-axis motor, lead screw, and transparent film of the platform components, helping to extend the service life of the 3D printer's core components.

[0137] Furthermore, the elastic deformation of light-transmitting components such as the light-transmitting film and the presence of a fluid lubrication layer can effectively reduce release force. Lower release force allows for finer supports for the printed parts, eliminating the need for robust support structures to prevent detachment. This makes it possible to print extremely fine and lightweight support structures, simplifying post-processing and resulting in a smoother surface finish on the printed product, which is beneficial for applications requiring high precision, such as dental models.

[0138] In addition, the reduced release force allows the Z-axis cantilever lifting speed of the forming module to be increased within a certain range, which may shorten the cycle time for printing each layer and improve the overall printing efficiency.

[0139] Furthermore, Figure 5 for Figure 1 Top view of the Z-axis cantilever. Figure 6 This is a schematic diagram of the gas passage for the 3D printer provided in this application. Figure 5 and Figure 6 As shown, the 3D printer also includes a pressure relief valve 400, which is located on the gas pipeline 203 between the air pump 100 and the receiving cavity 201. Furthermore, a pressure sensor 2031 is also provided on the gas pipeline 203 to detect the real-time air pressure within the receiving cavity 201. As described above, based on the air pressure control algorithm, the air pump 100 is controlled to inject gas into the receiving cavity 201, increasing the air pressure in the receiving cavity and generating a driving force on the forming platform 202 to move away from the light-transmitting component 2011 for demolding. After demolding, the air pump 100 can be turned off, and the pressure relief valve 400 controls the release of gas from the receiving cavity 201, causing the air pressure in the receiving cavity 201 to decrease.

[0140] In some embodiments, the air pressure in the receiving cavity 201 is increased, for example, to a first target air pressure. After release, the forming platform 202 is moved toward the light-transmitting component 2011 to the next printing position, and the air pressure in the receiving cavity 201 is decreased, for example, to a second target air pressure, such as a curing air pressure. Then, the optomechanical module projects light, and the printing material photocures to form the next printing layer attached to the forming platform 202. This process is repeated until the printed part is completed.

[0141] It should be noted that the curing chamber 2011 is typically maintained at a constant pressure during the photocuring process. The curing pressure is preferably equal to the ambient pressure, although other pressure values ​​are also possible, but generally not less than the ambient pressure. It should be noted that "equal to ambient pressure" means the difference between the pressure and the ambient pressure is within the allowable error range.

[0142] In some embodiments, the molding platform 202 is controlled to move away from the light-transmitting component 2011 to a preset release height, and the molding platform 202 completes the release. Of course, the release can also be determined by monitoring the separation of the film from the current printed layer.

[0143] Taking the printing of a 0.1mm thick layer as an example, the forming platform 202 is controlled to move away from the light-transmitting component 2011 and the receiving cavity 202 is inflated to increase its air pressure for demolding. The forming platform 202 rises by 1mm to complete the demolding. The forming platform 202 is controlled to descend by 0.9mm to reach the next printing position. The receiving cavity 201 is depressurized to reduce its air pressure, for example, to equal the ambient air pressure. The optomechanical module is controlled to project light, and the printing material is photocured to form the next printing layer attached to the forming platform 202. This process is repeated until the printing of the part is completed.

[0144] The optomechanical module projects a photocuring time corresponding to the layer thickness onto the light-transmitting component. After photocuring, due to the limitation of the Z-axis cantilever on the upward displacement of the forming platform 202 (for example, when the forming platform 202 moves upward by 1mm, it reaches the preset position), the air pump stops working and opens the pressure relief valve 400, causing the air pressure in the receiving cavity 201 to drop, for example, to the second target air pressure. The forming platform 202 moves downward by 0.9mm, reaching the predetermined position of the next printing layer, and the printing cycle of the next layer begins. When the pressure relief valve 400 is opened, the receiving cavity 201 releases gas, and the elastic deformation of the light-transmitting component, such as the light-transmitting film, returns to its initial state. The gap between the light-transmitting film and the current printing layer becomes larger, and the printing material fills the gap. Optionally, the thickness of the gap is usually determined by the printing material, for example, it can be 0.05mm, 0.075mm, 0.1mm, etc.

[0145] It should be noted that the height the molding platform 202 needs to rise to separate from the light-transmitting component 2011 for release is greater than the height required to reach the next printing position. Therefore, the molding platform 202 can first move away from the light-transmitting component 2011 to complete the release before moving towards the light-transmitting component 2011 to the next printing position. However, if the height the molding platform 202 needs to rise to separate from the light-transmitting component 2011 for release is not greater than the height required to reach the next printing position, then during the printing process, the molding platform 202 only needs to move away from the light-transmitting component 2011.

[0146] Optionally, the second target pressure can be the ambient pressure or the solidification pressure.

[0147] In some embodiments, when the entire printed part is completed, the pressure relief valve 400 controls the release of air pressure in the receiving cavity 201, so that the real-time air pressure in the receiving cavity 201 is consistent with the atmospheric pressure. Optionally, the process of releasing air pressure in the receiving cavity 201 by controlling the pressure relief valve 400 can be synchronized or asynchronous with the movement of the forming platform 202 toward the light-transmitting component 2011, and this application does not limit this.

[0148] It should be noted that the pressure sensor 2031 is used to detect the real-time pressure in the receiving cavity 201. For example, it is used to detect the first target pressure when gas is injected into the receiving cavity 201 to increase the pressure, and to detect the second target pressure when the pressure relief valve 400 is opened to decrease the pressure in the receiving cavity 201.

[0149] In some embodiments, the first target air pressure may be higher than the ambient air pressure, but less than or equal to the maximum inflation pressure of the air pump. The first target air pressure may be a fixed value or dynamically determined based on the printing parameters. Its specific air pressure value can be determined according to the actual working conditions, and this application does not limit it.

[0150] In some embodiments, the second target air pressure can be equal to the ambient air pressure. That is, when the air pressure sensor detects that the air pressure is zero, the molding platform moves downward by a corresponding displacement to reach the predetermined position of the next printing layer.

[0151] It should be noted that after the air pressure in the receiving cavity 201 is increased by mechanical drive or a combination of mechanical drive and pneumatic drive for demolding, the air pressure in the receiving cavity 201 is released and decreased by the pressure relief valve 400, for example, to the ambient air pressure or the curing air pressure. This application does not limit this.

[0152] The printing method provided in this application is based on the principle of gas dynamics. Through the coordinated control of an air pump, an air pressure sensor and a pressure relief valve, a dynamic air pressure regulation system for a 3D printer is constructed to achieve real-time monitoring and precise control of the air pressure in the accommodating cavity during the printing process.

[0153] In some embodiments, the pressure sensor and pressure relief valve, while fulfilling the above-mentioned functions, can also serve as a safety precaution. For example, if the pressure sensor detects that the real-time pressure in the receiving cavity exceeds a preset pressure threshold, indicating that the printer may be experiencing excessive internal pressure due to an abnormal situation, the pressure relief valve can be opened to control the release of gas from the receiving cavity, thereby reducing the pressure in the receiving cavity, preventing the accumulation of abnormal pressure, and ensuring safety.

[0154] As described above, the printing method provided in this application uses a pressure control algorithm to control an air pump to inject gas into a receiving cavity, thereby achieving precise control of the pressure inside the cavity during the injection process. For example, the real-time pressure of the receiving cavity is obtained through a pressure sensor, and then, based on the pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time pressure and a first target pressure.

[0155] In some embodiments, based on a pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time air pressure and the first target air pressure. Possible implementation methods include... Figure 7 As shown. Figure 7 Flowchart of the printing method provided in this application Figure 3 ,like Figure 7 As shown, the method includes:

[0156] S301. Based on the difference between the real-time air pressure and the first target air pressure, dynamically adjust the drive signal of the air pump according to the proportional-integral-derivative PID algorithm.

[0157] S302. Control the air pump to inject gas into the receiving cavity according to the drive signal.

[0158] For example, the air pressure control algorithm includes the proportional-integral-derivative (PID) algorithm, as shown in equation (1):

[0159]

[0160] Where u(t) represents the driving signal, such as the speed or output power of the air pump; e(t) represents the difference between the real-time air pressure and the first target air pressure, i.e., the air pressure deviation; Kp, Ki, and Kd are the proportional coefficient, integral coefficient, and derivative coefficient, respectively.

[0161] The real-time air pressure of the containment cavity is obtained by a pressure sensor, and the difference between the real-time air pressure and the first target air pressure is determined. Based on this difference, the drive signal for controlling the air pump is determined using a PID algorithm. The speed and / or output power of the air pump are controlled according to the drive signal to realize the control of the air pump injecting gas into the containment cavity until the air pressure in the containment cavity reaches the first target air pressure. The air pressure closed-loop control is realized through the PID algorithm.

[0162] It is understandable that when the air pressure in the containment chamber reaches the first target air pressure, the pressure relief valve is closed, and the containment chamber is in a closed environment.

[0163] The printing method provided in this application dynamically adjusts the drive signal of the air pump based on a PID algorithm according to the difference between the real-time air pressure in the receiving cavity and the first target air pressure, thereby controlling the air pump to inject gas into the receiving cavity and ensuring that the air pressure in the receiving cavity reaches the first target air pressure. By using a PID algorithm for closed-loop air pressure control, precise air pressure control is achieved during the gas injection process into the receiving cavity, overcoming the pressure control deficiencies in existing technologies and improving printing quality.

[0164] In some embodiments, based on the difference between the real-time air pressure and the first target air pressure, an air pump is controlled to inject gas into the receiving cavity according to an air pressure control algorithm. Possible implementation methods include... Figure 8 As shown. Figure 8 Flowchart of the printing method provided in this application Figure 4 ,like Figure 8 As shown, the method includes:

[0165] S401. Based on the difference between the real-time air pressure and the first target air pressure, the start and stop of the air pump are controlled by a pulse control algorithm to generate multiple inflation pulses.

[0166] S402. The air pump is controlled to inject gas into the receiving cavity according to multiple inflation pulses.

[0167] The actual air pressure inside the containment cavity is detected by a pressure sensor, i.e., the real-time air pressure. The difference between the real-time air pressure and the first target air pressure to be achieved is calculated. Based on the air pressure difference, a pulse control algorithm controls the start and stop of the air pump to generate a series of inflation pulse signals, i.e., multiple inflation pulses. This drives the air pump to inject gas into the containment cavity according to the multiple inflation pulses. Each inflation pulse signal corresponds to one start and stop cycle of the air pump.

[0168] The air pressure control algorithm includes a pulse control algorithm. The control parameters of the pulse control algorithm can be obtained from the printing parameters. The control parameters may include, but are not limited to, at least one of the following: pulse air pressure value, inflation duration of a single inflation pulse, and inflation sequence.

[0169] In some embodiments, printing parameters may include, but are not limited to, at least one of the following: material property parameters of the printing material, printing process parameters, and printing environment parameters. Material property parameters may include the type and viscosity of the printing material, printing process parameters may include layer thickness, exposure time, speed and distance at which the platform components perform separation, and printing environment parameters may include temperature and humidity.

[0170] The printing method provided in this application uses a pulse control algorithm to control the air pump to pulse-charge the receiving cavity, avoiding overpressure and achieving precise coordination between the platform component separation process and the start pulse. This enables efficient and dynamic assistance in platform component separation, applying the correct amount of air pressure and achieving precise and stable air pressure control during platform component separation. Furthermore, the control parameters of the pulse control algorithm can be determined by the printing parameters, and these parameters can be adaptively adjusted according to the printing parameters. This allows the control gas injection process to dynamically match the release requirements, ensuring stable control of the release force under different scenarios, improving the compatibility of the 3D printer, and making it suitable for various printing materials and complex printing tasks.

[0171] In some embodiments, before controlling the air pump to inject gas into the receiving cavity based on the air pressure control algorithm, a first target air pressure can be determined by scanning an identification unit on the molding module. The identification unit is located on the molding module and is used to uniquely identify the printing material.

[0172] For example, the molding module can be encapsulated in a capsule shape for single-use. When printing is needed, the molding module is assembled onto the 3D printer for printing. After printing, it is discarded, and a new molding module is used for the next print. Identification units, such as QR codes, can be set on the molding module to identify the printing material it contains. Alternatively, printing material, such as printing resin, can be injected into the molding module before printing.

[0173] In some embodiments, the identification unit may also be an NFC, RFID, or other tag, which can be a readable tag or a read-write tag, so as to update and manage the usage of the molding module in real time. The information stored in the identification unit may include basic parameters of the printing material, such as material name and number, and may also include one or more of the mixing parameters and printing parameters. Of course, the mixing parameters and printing parameters can also be determined by matching the basic parameters of the printing material with a database.

[0174] Information associated with the printing material can be obtained by scanning the identification unit, such as the first target air pressure value and printing parameters.

[0175] For example, the preset fixed air pressure value obtained from the information obtained by the scanning identification unit can be directly determined as the first target air pressure to be achieved when injecting gas into the containment cavity when printing with the current printing material.

[0176] Alternatively, the scanning identification unit obtains the printing parameters of the printing material, and dynamically determines the first target air pressure based on these parameters. The printing parameters include at least one of the material properties of the printing material, printing process parameters, and printing environment parameters. For example, the optimal air pressure value dynamically calculated by analyzing the viscosity, layer thickness, and environmental conditions of the printing material can be used as the first target air pressure.

[0177] The printing method provided in this application allows the first target air pressure to be either a fixed value or dynamically determined based on printing parameters. Setting the first target air pressure to a fixed value ensures ease of operation and reliability, while dynamically determining the first target air pressure allows for precise adaptation to the optimal air pressure based on the material properties of the printing material, the printing process, and environmental conditions, effectively addressing complex printing scenarios and improving printing results.

[0178] Figure 9 Schematic diagram of the printing apparatus provided in this application Figure 1 This printing device is used in a 3D printing system. The 3D printing system includes a molding module, which forms a receiving cavity. The molding module includes a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component. The receiving cavity is used to receive printing material. The receiving cavity includes a molding cavity located between the molding platform and the light-transmitting component. The molding platform can move toward or away from the light-transmitting component. Figure 9 As shown, the printing apparatus 40 provided in this application includes:

[0179] The control module 401 is used to control the movement of the molding platform away from the light-transmitting component and to make the air pressure in the receiving cavity higher than the ambient air pressure.

[0180] In one possible design, the control module 401 is also used for:

[0181] Release molding: Control the molding platform to move away from the light-transmitting component and make the air pressure in the receiving cavity higher than the ambient air pressure;

[0182] After the release process is completed, the molding platform is controlled to move to the next printing position for photocuring to form a printed layer attached to the molding platform.

[0183] In one possible design, the control module 401 is also used for:

[0184] After the release process is completed, the air pressure in the cavity is made equal to the ambient air pressure.

[0185] In one possible design, the control module 401 is also used for:

[0186] The molding platform moves away from the light-transmitting component by means of pneumatic and / or mechanical drive.

[0187] In one possible design, the control module 401 is also used for:

[0188] The air pressure in the containment cavity is increased to a level higher than the ambient air pressure, thus creating a driving force that pushes the molding platform away from the light-transmitting component.

[0189] In one possible design, the control module 401 is also used for:

[0190] The air pump is controlled based on a pressure control algorithm to inject gas into the receiving cavity, thereby increasing the air pressure in the cavity. In one possible design, the control module 401 is also used for:

[0191] The pressure in the containment chamber is reduced by releasing gas through a pressure relief valve.

[0192] In one possible design, the control module 401 is specifically used for:

[0193] The real-time air pressure in the containment cavity is detected by an air pressure sensor;

[0194] Based on the air pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time air pressure and the first target air pressure.

[0195] In one possible design, the control module 401 is also used for:

[0196] Based on the difference between the real-time air pressure and the first target air pressure, the drive signal of the air pump is dynamically adjusted according to the proportional-integral-derivative algorithm.

[0197] The air pump is controlled to inject gas into the receiving cavity according to the drive signal, which is used to control the speed and / or output power of the air pump.

[0198] In one possible design, the control module 401 is also used for:

[0199] Based on the difference between the real-time air pressure and the first target air pressure, multiple inflation pulses are generated by controlling the start and stop of the air pump using a pulse control algorithm.

[0200] The gas pump is controlled by multiple inflation pulses to inject gas into the receiving cavity.

[0201] exist Figure 9 On this basis, Figure 10 Schematic diagram of the printing apparatus provided in this application Figure 2 ,like Figure 10 As shown, the printing device 400 further includes a scanning module 402, which is used for:

[0202] Scan the identification unit on the molding module to obtain the first target air pressure. The identification unit is used to uniquely identify the printing material.

[0203] In one possible design, the scanning module 402 is also used for:

[0204] The preset fixed air pressure value obtained from the information obtained by the scanning identification unit is determined as the first target air pressure; or

[0205] The scanning identification unit obtains the printing parameters and determines the first target air pressure based on the printing parameters. The printing parameters include at least one of the material property parameters of the printing material, printing process parameters, and printing environment parameters.

[0206] In one possible design, the control module 401 is also used for:

[0207] The control parameters for the pulse control algorithm in the air pressure control algorithm are generated based on the printing parameters. The control parameters include at least one of the following: pulse air pressure value, inflation duration of a single inflation pulse, and inflation sequence.

[0208] In one possible design, the first target air pressure is higher than the ambient air pressure and less than or equal to the maximum inflation pressure of the air pump, and the second target air pressure is equal to atmospheric pressure.

[0209] In one possible design, the control module 401 is also used for:

[0210] If the real-time air pressure exceeds the preset air pressure threshold, the gas in the containment chamber will be released through the pressure relief valve, causing the air pressure in the containment chamber to drop.

[0211] The printing device provided in this application can execute the method provided in the above method embodiments. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0212] Figure 11 The structural diagram of the 3D printer provided in this application is as follows: Figure 11 As shown in the figure, the 3D printer provided in this application, as an electronic device 50, includes at least one processor 501 and a memory 502. Optionally, the device 50 also includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus.

[0213] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.

[0214] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0215] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0216] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0217] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0218] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0219] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0220] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0221] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0222] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0223] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0224] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0225] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0226] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0227] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A printing method, characterized in that, The method is applied to a molding module, the molding module forming a receiving cavity, the molding module including a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component, the receiving cavity being used to receive printing material, the receiving cavity including a molding cavity located between the molding platform and the light-transmitting component, the molding platform being movable toward or away from the light-transmitting component; the method includes: The molding platform is controlled to move away from the light-transmitting component and the air pressure in the receiving cavity is made higher than the ambient air pressure.

2. The method according to claim 1, characterized in that, Also includes: Release: Control the molding platform to move away from the light-transmitting component and make the air pressure in the receiving cavity higher than the ambient air pressure; After the release process is completed, the molding platform is controlled to move to the next printing position for photocuring to form a printed layer attached to the molding platform.

3. The method according to claim 2, characterized in that, The method includes: After the release process is completed, the air pressure in the receiving cavity is made equal to the ambient air pressure.

4. The method according to claim 1, characterized in that, The method further includes: The molding platform is controlled to move away from the light-transmitting component by pneumatic and / or mechanical drive.

5. The method according to claim 4, characterized in that, The step of controlling the molding platform to move away from the light-transmitting component via air pressure includes: The air pressure in the receiving cavity is controlled to increase, so that the air pressure in the receiving cavity is higher than the ambient air pressure, thereby generating a driving force on the molding platform away from the light-transmitting component.

6. The method according to claim 5, characterized in that, The control of the increase in air pressure in the containment cavity includes: The gas pump is controlled by a gas pressure control algorithm to inject gas into the receiving cavity, thereby increasing the gas pressure in the receiving cavity.

7. The method according to claim 1, characterized in that, The method further includes: The pressure in the cavity is reduced by releasing gas through a pressure relief valve.

8. The method according to claim 6, characterized in that, The method further includes: The real-time air pressure of the receiving cavity is detected by an air pressure sensor; Based on the aforementioned air pressure control algorithm, the air pump is controlled to inject gas into the receiving cavity according to the difference between the real-time air pressure and the first target air pressure.

9. The method according to claim 8, characterized in that, The step of controlling the air pump to inject gas into the receiving cavity based on the air pressure control algorithm and the difference between the real-time air pressure and the first target air pressure includes: Based on the difference between the real-time air pressure and the first target air pressure, the drive signal of the air pump is dynamically adjusted according to the proportional-integral-derivative algorithm. The drive signal controls the air pump to inject gas into the receiving cavity, and the drive signal is used to control the speed and / or output power of the air pump.

10. The method according to claim 8, characterized in that, The step of controlling the air pump to inject gas into the receiving cavity based on the air pressure control algorithm and the difference between the real-time air pressure and the first target air pressure includes: Based on the difference between the real-time air pressure and the first target air pressure, the start and stop of the air pump are controlled by a pulse control algorithm to generate multiple inflation pulses. The gas pump is controlled to inject gas into the receiving cavity according to the plurality of inflation pulses.

11. The method according to claim 8, characterized in that, Before the gas pump is controlled to inject gas into the receiving cavity based on the gas pressure control algorithm, the method further includes: The first target air pressure is obtained by scanning the identification unit located on the molding module. The identification unit is used to uniquely identify the printing material.

12. The method according to claim 11, characterized in that, The step of scanning the identification unit located on the molding module to obtain the first target air pressure includes: The preset fixed air pressure value obtained from the information obtained by scanning the identification unit is determined as the first target air pressure; or The printing parameters are obtained by scanning the identification unit, and the first target air pressure is determined based on the printing parameters. The printing parameters include at least one of the material property parameters of the printing material, printing process parameters, and printing environment parameters.

13. The method according to claim 12, characterized in that, Also includes: The control parameters for the pulse control algorithm in the air pressure control algorithm are generated based on the printing parameters. The control parameters include at least one of the following: pulse air pressure value, inflation duration of a single inflation pulse, and inflation sequence.

14. The method according to claim 13, characterized in that, The first target air pressure is higher than the ambient air pressure and less than or equal to the maximum inflation pressure of the air pump.

15. The method according to claim 8, characterized in that, The method further includes: If the real-time air pressure exceeds a preset air pressure threshold, the gas in the receiving cavity is released through the pressure relief valve, causing the air pressure in the receiving cavity to decrease.

16. A printing apparatus, characterized in that, An apparatus for use in a 3D printing system, the 3D printing system including a molding module having a receiving cavity, the molding module including a light-transmitting component disposed on one side of the receiving cavity and a molding platform disposed opposite to the light-transmitting component, the receiving cavity for receiving printing material, the receiving cavity including a molding cavity located between the molding platform and the light-transmitting component, the molding platform being movable toward or away from the light-transmitting component; the apparatus includes: The control module is used to control the movement of the molding platform away from the light-transmitting component and to make the air pressure in the receiving cavity higher than the ambient air pressure.

17. A 3D printer, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-15.

18. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-15.

19. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-15.

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