CN116277980A - Zero-finding control method of 3D printer and 3D printer - Google Patents
Zero-finding control method of 3D printer and 3D printer Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a zero-finding control method of a 3D printer and the 3D printer. The method comprises the following steps: controlling an exposure device of the 3D printer to expose under the condition that a forming platform of the 3D printer and a screen of the 3D printer are in a bonding state so as to form an initial printing layer; controlling the forming platform to move to a preset position, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round; the preset position is determined according to the current number of printing layers; and executing the printing action of the next round until a preset event occurs. The invention solves the technical problem of printing failure caused by unparallel forming platform and trough and screen of the 3D printer.
Description
The present application claims priority from patent application No. 2022113505935 entitled "zero-seek control method for 3D printer and 3D printer" filed on 10/31 of 2022, the entire contents of which are incorporated herein by reference.
Technical Field
The invention relates to the field of 3D printing, in particular to a zero-finding control method of a 3D printer and the 3D printer.
Background
The photo-curing 3D printer irradiates the liquid photosensitive resin by utilizing ultraviolet light or other light sources with specific wavelength ranges and initiates photochemical reaction, so that the photo-curing resin in the exposed area is cured and molded, and the three-dimensional object to be molded can be obtained after layer-by-layer curing. In the process of layer-by-layer molding of a three-dimensional object, a first molded solidified layer needs to be firmly adhered to a molding surface of a molding platform to serve as a molding foundation of a subsequent layer, which requires that positions of the molding platform and a trough (in the field of LCD 3D printing, the platform, the trough and an LCD exposure screen are required) be accurately adjusted before printing is started, and installation errors are eliminated, so that the molding surface of the molding platform and the bottom surface of the trough (the molding platform, the trough and the exposure screen) are kept parallel and have proper intervals.
However, the forming platform, the trough or the exposure screen of the 3D printer may not be parallel, which not only affects the printing quality of the printed matter, but also may cause uneven adhesion due to inconsistent adhesion force of the first layer printing, solidification and adhesion, so that the subsequent printing has the risk of falling off the printed matter, and the printing fails.
Disclosure of Invention
The embodiment of the invention provides a zero-finding control method of a 3D printer and the 3D printer, so as to improve printing quality and reduce printing failure risk.
According to an aspect of the embodiment of the present invention, there is provided a zero-finding control method of a 3D printer, including: controlling the exposure device of the 3D printer to expose to form an initial printing layer under the condition that the forming platform of the 3D printer and the exposure device of the 3D printer are in a bonding state; controlling the forming platform to move to a preset position, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round; the preset position is determined according to the current number of printing layers; and executing the printing action of the next round until a preset event occurs. Wherein the current number of printing layers is an integer greater than or equal to 0.
According to another aspect of an embodiment of the present invention, there is provided a 3D printer including: the forming platform, the material tray and the exposure device are sequentially arranged along a first direction; the exposure device comprises a mounting seat and a screen assembly; the screen assembly is movably arranged on the mounting seat along the first direction and comprises a mounting bracket and a screen fixed on the mounting bracket, an elastic piece is further arranged on the mounting seat, and the elastic piece is propped between the mounting bracket and the mounting seat along the first direction; the memory stores a computer program which, when executed by the processor, performs the control method of the 3D printer.
As an alternative example, the 3D printer further includes a sensor for acquiring a first displacement amount of the exposure device or a second displacement amount of the molding stage or a first pressure amount of the exposure device or a second pressure amount of the molding stage. The second displacement amount of the molding table is a displacement amount generated by the force of the exposure device when the molding table is used as the floating unit.
According to still another aspect of the embodiments of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program when executed by a processor performs the control method of the 3D printer described above.
According to still another aspect of the embodiments of the present invention, there is also provided an electronic device including a memory in which a computer program is stored, and a processor configured to execute the control method of the 3D printer described above by the computer program.
In the embodiment of the invention, under the condition that a forming platform of a 3D printer and an exposure device of the 3D printer are in a bonding state, the exposure device of the 3D printer is controlled to expose so as to form an initial printing layer; controlling the forming platform to move to a preset position, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round; the preset position is determined according to the current number of printing layers; and executing the printing action of the next round until a preset event occurs. In the method, if the forming platform and the exposure device are uneven, the forming platform and the exposure device can be firstly in a bonding state and are subjected to first printing, then the forming platform is controlled to move and print for one or more rounds, so that the forming surface of the forming platform and the exposure device can be finally kept parallel through multiple times of printing under the condition that the forming platform and the exposure device are uneven, and the technical problem of printing failure caused by the non-parallelism between the forming platform of the 3D printer and the material groove and the exposure device is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of an alternative method of controlling a 3D printer according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a molding platform and screen of an alternative control method of a 3D printer according to an embodiment of the present invention;
FIG. 3 is a schematic view showing a screen and a horizontal plane angle of a control method of an alternative 3D printer according to an embodiment of the present invention;
FIG. 4 is a schematic view of a forming table with respect to a horizontal plane of an alternative control method of a 3D printer according to an embodiment of the present invention;
FIG. 5 is a flow chart of another alternative method of controlling a 3D printer according to an embodiment of the invention;
FIG. 6 is a bottom view of a 3D printer of an alternative method of controlling a 3D printer according to embodiments of the present invention;
FIG. 7 is a schematic illustration of a multi-layer print of an alternative method of controlling a 3D printer according to embodiments of the present invention;
fig. 8 is a schematic structural view of an alternative 3D printer according to an embodiment of the present invention.
Fig. 9 is a bottom view of a 3D printer according to another alternative control method of the 3D printer according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to a first aspect of an embodiment of the present invention, there is provided a control method of a 3D printer, optionally, as shown in fig. 1, the method includes:
s102, under the condition that a forming platform of a 3D printer and an exposure device of the 3D printer are in a bonding state, controlling the exposure device of the 3D printer to expose so as to form an initial printing layer; wherein at least one of the molding table and the exposure apparatus is a floating assembly;
the exposure device may be an exposure screen, for example, an LCD (Liquid Crystal Display ), an OLED (Organic Light-Emitting Diode) screen, an LCOS (Liquid Crystal On Silicon ) screen, a Micro-Led (Micro Light Emitting Diode, micro Light Emitting Diode) screen, a Mini-Led (Mini Light Emitting Diode, sub-millimeter Light Emitting Diode) screen, a SXRD (Silicon X-Tal Re-active Display) screen, or the like. Further, the exposure device may refer to an exposure surface of the light source for projection, for example, the exposure surface is a bottom surface of the tray on the basis of the projection light source, and in the case of using a screen as the display light source, the exposure surface is a display surface of the screen. The floating assembly is a device that can be displaced according to an external force, and in this embodiment, at least one of the molding stage and the exposure apparatus is the floating assembly. For example, in the case where only the exposure apparatus is a floating assembly, the molding stage descends and contacts the floating assembly, and the floating assembly is displaced by the pushing force of the molding stage and gradually contacts the molding stage. Further, in the case that the exposure device is a floating assembly, the exposure device is movably arranged on the mounting seat of the 3D printer along the first direction; the exposure device comprises a mounting bracket and a screen fixed on the mounting bracket, and an elastic piece is further arranged on the mounting seat and is propped between the mounting bracket and the mounting seat along the first direction. Based on this, the screen can float and change the degree of tilt. Similarly, where the forming table is a floating assembly, there is a similar structure so that the forming table can vary its degree of inclination over a range. The laminating state is that the laminating degree between the two is in the state that accords with the settlement requirement, still includes the bottom structure of silo between the shaping face of shaping platform and exposure device in this application.
Optionally, in this embodiment, the 3D printer may be a photo-curing 3D printer, where the photo-curing 3D printer irradiates the liquid photosensitive resin with ultraviolet light or other light sources with specific wavelength ranges and initiates photochemical reaction, so that the photo-curing resin in the exposed area is cured and formed, and the three-dimensional object to be formed is obtained after layer-by-layer curing. In the process of layer-by-layer molding of a three-dimensional object, a cured layer molded first needs to be firmly adhered to a molding surface of a molding platform to serve as a molding base of a subsequent layer.
In this embodiment, the forming platform of the 3D printer and the screen of the 3D printer may be in a bonding state, where the forming platform of the 3D printer and the screen are parallel or nearly parallel (i.e., an included angle between the forming platform and the screen is smaller than a preset value). As shown in fig. 2, fig. 2 shows a case where the molding table 10 is not parallel to the exposure apparatus 20, and the exposure apparatus 20 is limited by the limiting portion 30. If the molding platform 10 is pressed down in the prior art, the exposure device 20 is crushed or the printing, curing and pasting forces are inconsistent, which may lead to uneven pasting. In this application, if the angle between the molding stage 10 and the horizontal plane cannot be changed and the angle between the exposure device 20 and the horizontal plane can be changed, when the molding stage 10 and the exposure device 20 are attached, the exposure device 20 is biased away from the original position by the force applied by the molding stage 10, as shown in fig. 3, the exposure device 20 is pressed down from the original position by the molding stage 10, and the print (or the initial print layer) 40 of the first layer is formed. As shown in fig. 4, the modeling stage 10 is parallel to the exposure apparatus, and forms a first layer of print 40.
In this embodiment, if the modeling stage and the exposure device are in a bonded state, the exposure device of the 3D printer is controlled to perform exposure to form an initial print layer, such as the initial print layer 40 in fig. 3.
In a specific example, before controlling the exposure device of the 3D printer to perform exposure to form the initial print layer, the method further includes:
the control platform moves for the first time until the forming platform and the exposure device are in a bonding state; wherein, in the primary moving process, no printing material is arranged in a tray arranged between the molding platform and the exposure device.
Specifically, if a printing material (such as resin) is stored in a tray between the molding stage and the exposure device, the force of the printing material on the screen is large, and the screen is easily damaged. If the printing material is not stored in the tray between the forming platform and the exposure device, the screen is less stressed by the forming platform, and the screen can be effectively prevented from being damaged.
S104, controlling the forming platform to move to a preset position, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round; the preset position is determined according to the current number of printing layers;
after printing of the initial print layer is completed, printing of the subsequent print layer or layers may continue. The print action of each layer may be regarded as one-pass print action, and a print action of a plurality of passes indicates that multiple layers are printed. When the printing action of each round is executed, the position of the forming platform is adjusted to a preset position, and then the printing action of the current round is executed. The preset position adjusted is determined according to the current printing layer number. For example, when printing the initial print layer for the second round, the forming platform is adjusted upward by a distance of one layer thickness to reach a preset position, and printing for the second round is performed. If a third pass of printing is performed, the former is adjusted upward by the distance of the two layer thicknesses compared to the position of the first pass of printing. That is, during the printing of each print run, the modeling platform adjusts the distance of N-1 layer thicknesses upward as compared to the print run of the initial print layer, N being the current print run. For another example, after the initial printing layer is printed, when the second round of printing is performed (i.e. when the second layer is printed), the forming platform is controlled to move upwards to the position according to the position of the forming platform of the second layer preset in the 3D printer; when the printing of the nth round is performed (namely when the nth layer is printed), the forming platform is controlled to move upwards to the position according to the position of the forming platform of the preset printing nth layer in the 3D printer, wherein N is the current printing round.
It should be noted that, the control forming platform can be moved to a preset position, any running track in the art can be adopted, as long as the final stop position is the preset position, further, the motor rotation amount of the lifting device can be recorded, under the condition of being in a fitting state, the motor can memorize the corresponding position, the subsequent motor can directly seek zero through the memorized position or move to the preset position, and also can quickly move through subtracting the upward or downward position from the memorized position.
In one specific example, controlling the molding platform to move to a preset position includes:
and acquiring the primary moving distance of the forming platform, and controlling the lifting mechanism of the 3D printer to move according to the primary moving distance and the current printing layer number so as to enable the forming platform to move to a preset position.
Specifically, the primary movement distance may be obtained by any means in the art, for example, by a displacement sensor or the number of rotations of a motor, or the like. Each printing layer corresponds to a specific layer thickness, and the moving target position (namely the preset position) of the forming platform can be determined according to the initial moving distance and the printing layer number. According to the embodiment, the motor in the lifting mechanism is used for controlling and moving the platform to the target position, so that the displacement can be accurately controlled.
S106, executing the printing action of the next round until a preset event occurs.
If the preset event is not triggered, the printing action is repeated according to the round, so that the preset event needs to be set to stop the continuously repeated printing action. The preset event can be preset, and after the setting, the setting can be adjusted according to actual conditions.
According to the method, the forming surface of the forming platform and the exposure device are kept parallel in a printing mode by matching with the floating assembly, zero searching can be realized quickly and conveniently, the printing quality of subsequent printing is improved, and the probability of printing failure is reduced.
In one embodiment, the zero-finding control method further includes:
controlling the forming platform to move towards the exposure device until a plurality of preset target positions of the platform are acted;
and adjusting the levelness of the forming platform so that the difference value of acting forces received by all preset target positions is smaller than a preset threshold value.
The plurality of preset target positions can be distributed at different positions of the molding surface of the molding platform. For example, may be distributed over the corners of the forming table. Any preset target position and another preset target position which is positioned at the opposite angle are in symmetrical relation based on the center point of the molding surface.
Specifically, the forming platform may be a cuboid, may be divided into four equal areas, and the number of preset target positions may be 4, and it may be understood that the number of preset target positions may also be 6, 8, etc., and are respectively distributed in the four areas of the forming platform. Under the condition that the 3D printer is arranged on the horizontal plane, the forming platform is controlled to move towards the exposure device, namely, the forming platform is controlled to move downwards, and acting force of a lower structure can be applied in the downwards moving process. And stopping moving under the condition that each preset target position is acted by the acting force. It should be noted that, if the applied force is greater than or equal to the alarm value, the forming platform stops moving and sends out the early warning information.
It should be noted that, the levelness of the forming platform is adjusted by using the acting force applied to two preset positions of the forming platform in opposite angles, so that the difference value of the acting force is small enough, and the difference value can be a value below 1N, such as 0.1N, 0.2N, 0.3N, etc. And under the condition that the difference value of the two groups of opposite angles is smaller than a preset threshold value, the forming platform is considered to be leveled. The detection of the applied force may be performed by a steel sensor or may be performed by a displacement sensor, and the applied force may be considered to be the same when the displacement is the same, and the applied force may be considered to be applied when the displacement amount is present.
Further, the above-mentioned "control the movement of the forming platform to the exposure device" may be performed periodically until the plurality of preset target positions of the forming platform are all subjected to the acting force ", and if the acting force does not meet the set requirement, a prompt signal may be sent or a prompt signal may be uploaded to the cloud server. In general, the dropping of the board is a common problem of 3D printing, and by acquiring the value of the applied force, the reason for dropping the board can be further checked. In a specific embodiment, after the levelness of the forming platform is adjusted, repeated detection is performed once, that is, the forming platform is controlled to move downwards, and whether the acting forces of a plurality of preset target positions meet the set requirements is detected. It should be understood that the setting requirement can be set according to the actual scene, and the setting requirement is not specifically limited herein.
In one embodiment, the difference value of the acting forces received by each preset target position is smaller than a preset threshold, which may mean that the difference value between the acting forces received by the preset target positions is smaller than the preset threshold, where the distances between the preset target positions and the center point need to be equal; the method can also be used for adjusting the levelness to meet the condition that the difference value of the acting force received at the diagonal preset target position is smaller than the preset threshold value, and the acting force at the preset target position is not adjusted.
In this embodiment, whether the molding platform of the 3D printer and the exposure device of the 3D printer are in a bonding state is determined. The basis for the determination may be one or more of the following: the first displacement amount of the exposure device, the first pressure amount received by the exposure device, the second displacement amount of the molding stage, and the second pressure amount received by the molding stage.
If the angle between the molding table and the horizontal plane cannot be changed and the angle between the exposure device and the horizontal plane can be changed, the exposure device generates a displacement amount with respect to the initial position, and the displacement amount is used as a first displacement amount. If the angle of the molding table to the horizontal plane can be changed and the angle of the exposure device to the horizontal plane cannot be changed, the molding table generates a displacement amount with respect to a preset position where the molding table should be located, and the displacement amount is taken as a second displacement amount. It should be noted that the preset position of the printer is available according to the built-in controller of the printer. The second displacement may also be obtained from a pressure sensor or a displacement sensor. Whether the angle between the forming platform and the horizontal plane can be changed or the angle between the exposure device and the horizontal plane can be changed, acting force can be applied between the forming platform and the exposure device, the pressure of the forming platform received by the exposure device is the first pressure amount, and the pressure of the exposure device received by the forming platform is the second pressure amount.
In this embodiment, the first displacement and the second displacement both include a maximum displacement and a minimum displacement. In the process of downward movement of the forming platform, acquiring the maximum displacement and the minimum displacement in the first displacement of the screen, and determining that the forming platform is attached to the screen under the condition that the maximum displacement meets a first condition and the minimum displacement meets a second condition; or in the process of downward movement of the forming platform, acquiring the maximum displacement and the minimum displacement in the second displacement of the forming platform, and determining that the forming platform is attached to the screen under the condition that the maximum displacement meets a third condition and the minimum displacement meets a fourth condition.
The first displacement amount or the second displacement amount may be acquired by a displacement sensor. The first displacement amount of the screen or the second displacement amount of the forming platform is obtained by arranging a displacement sensor on the screen or the forming platform. The first displacement amount or the second displacement amount may also be acquired by a pressure sensor. And determining the received pressure quantity through the pressure sensor, and then determining the first displacement quantity of the screen or the second displacement quantity of the forming platform through the corresponding relation between the pressure quantity and the displacement quantity.
Regarding the maximum displacement amount and the minimum displacement amount of the obtained first displacement amount, if the maximum displacement amount meets a first condition and the minimum displacement amount meets a second condition, the forming platform and the screen are considered to be attached. Or regarding the maximum displacement amount and the minimum displacement amount of the second displacement amount, if the maximum displacement amount satisfies the third condition and the minimum displacement amount satisfies the fourth condition, the molding platform is considered to be attached to the screen.
In this embodiment, the first condition, the second condition, the third condition, and the fourth condition may include a range or include a threshold value. In other words, the first condition includes falling within a first interval or less than a first threshold, the second condition includes falling within a second interval or greater than a second threshold, the third condition includes falling within a third interval or less than a third threshold, and the fourth condition includes falling within a fourth interval or greater than a fourth threshold. For example, if the displacement is a range, the maximum displacement is within one range, the minimum displacement is within another range, and the condition is considered to be satisfied, if the threshold is included, the maximum displacement is smaller than a threshold, and the minimum displacement is larger than a threshold, and the condition is considered to be satisfied. If the first condition and the second condition are not satisfied at the same time, the zero-finding control needs to be performed again. If the third condition and the fourth condition are not satisfied at the same time, the zero searching control needs to be performed again. The average value of the first interval is larger than that of the second interval, and the first threshold is larger than the second threshold. The average value of the third interval is larger than that of the fourth interval, and the third threshold value is larger than the fourth threshold value. Further, the second condition may further include that the minimum displacement amount is maintained for a duration falling within the second interval for a preset duration. The fourth condition may further include that the minimum displacement amount is maintained for a duration falling within the fourth interval to reach a preset duration. In one specific embodiment, in order to satisfy the first condition and the second condition, the following operations may be performed: and controlling the forming platform to move downwards and judging whether the minimum displacement amount falls into a second interval, if so, controlling the forming platform to stop moving, and then judging whether the minimum displacement amount can keep the duration falling into the second interval to reach the preset duration, if not, controlling the forming platform to rise or fall to enable the minimum displacement amount to fall into the second interval, and if so, judging whether the maximum displacement amount falls into a first interval or is larger than a first threshold. In the case where the maximum displacement amount does not fall within the first region or is greater than the first threshold value, zero-finding fails. And if the maximum displacement falls into the first interval or is smaller than or equal to a first threshold value, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round.
In this embodiment, whether the molding platform is attached to the screen may also be determined according to the first pressure amount or the second pressure amount.
After the forming platform and the screen are contacted with each other, acting force is applied between the forming platform and the screen, the pressure of the forming platform received by the screen is the first pressure amount, and the pressure of the screen received by the forming platform is the second pressure amount.
In this embodiment, the first pressure amount and the second pressure amount both include a maximum pressure amount and a minimum pressure amount. In the process of downward movement of the forming platform, acquiring the maximum pressure and the minimum pressure in the first pressure of the screen, and determining that the forming platform is attached to the screen under the condition that the maximum pressure meets a fifth condition and the minimum pressure meets a sixth condition; or in the process of downward movement of the forming platform, acquiring the maximum pressure and the minimum pressure in the second pressure of the forming platform, and determining that the forming platform is attached to the screen under the condition that the maximum pressure meets the seventh condition and the minimum pressure meets the eighth condition.
The first pressure amount or the second pressure amount may be acquired by a pressure sensor. By providing a pressure sensor on the screen or on the forming table, a first amount of pressure of the screen or a second amount of pressure of the forming table is obtained. The first amount of pressure or the second amount of pressure may also be obtained by a displacement sensor. And determining the moving displacement through the displacement sensor, and determining the first pressure amount of the screen or the second pressure amount of the forming platform through the corresponding relation between the displacement and the pressure amount.
Regarding the maximum pressure amount and the minimum pressure amount of the obtained first pressure amount, if the maximum pressure amount satisfies the fifth condition and the minimum pressure amount satisfies the sixth condition, the molding platform is considered to be attached to the screen. Or regarding the maximum pressure amount and the minimum pressure amount of the second pressure amount, if the maximum pressure amount satisfies the seventh condition and the minimum pressure amount satisfies the eighth condition, the molding stage is considered to be attached to the screen.
In this embodiment, the fifth condition, the sixth condition, the seventh condition, and the eighth condition described above may include a range or include a threshold value. In other words, the fifth condition includes falling within the fifth interval or being smaller than the fifth threshold, the sixth condition includes falling within the sixth interval or being larger than the sixth threshold, the seventh condition includes falling within the seventh interval or being smaller than the seventh threshold, and the eighth condition includes falling within the eighth interval or being larger than the eighth threshold. If the maximum pressure is within one range and the minimum pressure is within another range, the condition is considered satisfied, if the threshold is included, the maximum pressure is less than a threshold, and the minimum pressure is greater than a threshold, the condition is considered satisfied.
In a specific embodiment, the preset event may include completing a printing action of a preset number of layers and/or a current molding surface of the molding platform is parallel to the floating substrate of the screen.
If the preset event is the printing action of completing the preset layer number, the first printing action and the subsequent multiple printing actions including the printing of the initial printing layer are performed, and the total printing times reach the preset layer number, namely the preset event is considered to occur, and the printing is stopped. If the preset event is that the current molding surface of the molding platform is parallel to the floating substrate of the screen, the number of printing layers is not considered during printing, and the printing action is repeated until the current molding surface of the molding platform is parallel to the floating substrate of the screen, and the preset event is considered to occur. It should be noted that, the value corresponding to the preset layer number is determined, for example, the value m may be 10/20/30 layer, and if the printed piece has a low-precision area, zero finding may be achieved by printing the low-precision area. The number of preset layers can be determined according to the machining error and the assembly error.
In one embodiment, as shown in fig. 5, before controlling the exposure device of the 3D printer to perform exposure to form the initial print layer, the method further includes:
s100, controlling the forming platform to move down by a target distance according to a preset speed;
s101, after the forming platform moves down by the target distance, controlling the forming platform to move down continuously until the forming platform and the exposure device are in a bonding state.
Specifically, in the initial state, a certain distance is reserved between the forming platform and the screen, and the forming platform moves downwards at a preset speed until the forming platform is attached to the screen. In the downward moving process, the object distance is moved downward in the first stage, then the downward moving in the second stage is performed, and whether the forming platform is attached to the screen or not is detected in the second downward moving process.
In this embodiment, in the process of the first stage of downward movement of the forming platform, a plurality of distance segments may be moved downward, and the total distance of the moved distance segments is the target distance. The plurality of distance segments may have different downshifting speeds.
After the first stage downward movement is finished, the forming platform and the trough can be subjected to residue detection before the second stage downward movement is started, if no residue exists, the second stage downward movement can be performed, and if the residue exists, the second stage downward movement is stopped, and the forming platform is moved up to the initial position.
When the angle between the screen and the horizontal plane is in a change state after the forming platform is attached to the screen, applying reducing force to the screen under the condition that the angle between the screen and the horizontal plane is fixed, wherein the reducing force is force for promoting the angle of the screen to be reduced after the angle of the screen is changed; or under the condition that the angle between the forming platform and the horizontal plane is in a change state and the angle between the screen and the horizontal plane is fixed, applying a reducing force to the forming platform, wherein the reducing force is force for promoting the angle of the forming platform to be reduced after the angle of the forming platform is changed.
The reducing force in this embodiment may be provided by at least one of an elastic member such as a spring, a magnet, and an energized circuit, so that the angle between the screen or the molding platform and the horizontal plane is reduced to the angle before the lamination. The magnitude of the reducing force can be adjusted.
In one embodiment, under the condition of completing zero searching, that is, under the condition of occurrence of the preset event, the forming platform or the exposure device is locked, so that the forming platform and the screen cannot move when the printed piece is formed by exposure, and the forming precision of the printed product and auxiliary liquid discharge are improved. Further, after the preset event occurs, the forming platform or the exposure device is locked, compared with the case that the Z-axis moving unit carries the component platform to move towards the bottom surface of the container in the traditional zero searching operation until the component platform is attached to the bottom surface of the container and has a certain pressure position to stop, wherein the position where the component platform stops is used as the starting position for printing the 3D object, the container is supported and fixed by the bearing unit, the situation that an inclined printing layer still exists in printing in the traditional zero searching operation is avoided, and the method has the advantage of being not easy to fall off.
After the first layer of printing piece is formed by exposure, the forming platform is controlled to move upwards, and a plurality of layers of printing pieces are formed by exposure until the printing pieces with preset layers or the current forming surface of the forming platform is parallel to the floating substrate of the screen. There are two methods for controlling the upward movement of the molding platform: after a first layer of printing piece is formed by exposure, the forming platform is controlled to gradually rise, and exposure printing is carried out once every one layer of layer thickness rising distance until the printing piece with the preset layer number is completed or the current forming surface of the forming platform is parallel to the floating substrate of the screen; or after the first layer printing piece is formed by exposure, controlling the forming platform to execute a first action, and performing exposure printing once every time the first action is executed until the current forming surface of the printing piece or the platform with the preset layer number is parallel to the floating substrate of the screen, wherein the first action comprises rising to a height larger than one layer thickness and then descending to a position which is one layer thickness away from the previous layer printing piece.
Fig. 6 is a bottom view of the 3D printer of the present embodiment, the printer including: a trough 10 for carrying photosensitive resin; a forming table (not shown in fig. 6) having a forming surface for carrying a 3D printed product; a lifting mechanism (not shown in fig. 6) for driving the modeling platform to move in the printing direction (i.e., up-down direction); an exposure device 20 for forming an exposure image; the sensor 30, shown as a displacement sensor, is secured to the mounting plate 50 by a clamp 40. The exposure device 20 may include a light source and a liquid crystal display screen, and the light source projects light to the liquid crystal display screen; and a liquid crystal display screen for projecting an exposure image of the piece to be printed.
In this embodiment, the 3D printer further includes a magnetic element 60 for locking the exposure device, so as to facilitate printing. After the zero searching is completed, the screen is fixed by the magnetic element, and the subsequent printing is performed.
In one embodiment, when zero searching starts, the forming platform can quickly descend, then slowly descends, residue detection is carried out after the descending, if no residue exists, the forming platform descends at an ultra-slow speed to perform zero searching, and whether the forming platform is attached to the screen or not is judged according to the reading of the displacement sensor. When the one-key zero searching of the forming platform is installed, initial reading of the displacement sensor is recorded, and the forming platform is controlled to return to the zero position. Before the first exposure, the spring compensates by setting the highest limit point and the lowest limit point around the screen, and the zero-finding adjustment is carried out by the 4 displacement sensors. When the forming table descends, the forming table descends at a speed V1 for S1, and then descends at a speed V2 for S2, wherein V1 is larger than the sum of V2, S1 and S2 to be the target distance. Then, residue detection is performed, N is a preset value. And starting floating zero searching under the condition of no residues, and moving downwards at the speed of V3, wherein V3 is smaller than V2. The forming plane of the forming platform has certain flatness error, and the conditions of low left side, high right side, low left side, low front and back or high front and back are provided. When the printing plane is tightly attached to the bottom of the material tray, the material tray is pushed downwards, so that a screen below the material tray is pushed downwards, and then the displacement sensor and the elastic component are triggered to incline downwards to displace; at this time, the displacement sensor records the maximum displacement amount and the minimum displacement amount. If the maximum displacement exceeds the preset interval, the zero searching fails, the alarm is given, and the specific problem is checked. If the maximum displacement accords with the preset interval, reading whether the minimum displacement reaches the preset interval, if so, determining that all parts of the platform touch the bottom of the material tray, and keeping the forming surface of the forming platform parallel to the bottom of the material tray and the screen, performing exposure treatment, and printing a first layer of printing piece.
After the first layer is printed, the forming platform gradually rises, the displacement sensor and the elastic element are restored to be kept at the first printing position, and the printing plane is separated from the tray; and continuing to print the second layer, and moving the forming platform to a preset position for printing the second layer when the second layer is printed. Repeating the printing, and completing zero searching when the mth layer is reached. As shown in fig. 7, the current molding surface is parallel to the screen through the multi-layer printing. The N, S, S2, S3, V1, V2, V3 and m can be flexibly arranged.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
According to another aspect of the embodiments of the present application, as shown in fig. 8, there is also provided a 3D printer, including: the device comprises a memory, a processor, a forming platform, a material tray, an exposure device, a mounting seat and an elastic piece for providing reducing force; the forming platform, the material tray and the exposure device are sequentially arranged along a first direction; the exposure device comprises a mounting seat and a screen assembly; the screen assembly is movably arranged on the mounting seat along the first direction and comprises a mounting bracket and a screen fixed on the mounting bracket, an elastic piece is further arranged on the mounting seat, and the elastic piece is propped between the mounting bracket and the mounting seat along the first direction; the memory stores a computer program which, when executed by the processor, performs the 3D printer control method.
In one embodiment, as shown in fig. 9, in the case of a sensor using a pressure sensor, a guide post is provided on the mounting bracket, the guide post being spaced from the pressure sensor 80, and the elastic member 90 includes a spring, which is sleeved on the guide post. The mount pad includes box and upper cover plate, and upper cover plate and box limit up jointly and hold the chamber, are equipped with the guide way that runs through along first direction on the upper cover plate, and screen assembly 20 movably card is located in the guide way, leads screen assembly 20 through the guide way, prevents that screen assembly 20 from taking place the skew and jamming at the zero-finding in-process, can't reset. One side of the upper cover plate, which is away from the mounting bracket, is provided with a fixing frame 105, the fixing frame 105 is arranged opposite to the mounting bracket, and the pressure sensor 80 is arranged on the fixing frame 105.
The mounting bracket is provided with a third magnetic attraction piece 110, the upper cover plate is provided with a fourth magnetic attraction piece 113, and the third magnetic attraction piece 110 and the fourth magnetic attraction piece 113 are opposite and can be attracted. The magnetic attraction piece can be an electromagnet, and the locking of the exposure device can be realized by switching on and off.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, such as the division of the units, is merely a logical function division, and may be implemented in another manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (18)
1. The zero-finding control method for the 3D printer is characterized by comprising the following steps of:
controlling the exposure device of the 3D printer to expose under the condition that the forming platform of the 3D printer and the exposure device of the 3D printer are in a bonding state so as to form an initial printing layer; wherein at least one of the molding table and the exposure apparatus is a floating assembly;
controlling the forming platform to move to a preset position, controlling the exposure device to expose to form a current printing layer, and completing the printing action of the current round; the preset position is determined according to the current number of printing layers;
and executing the printing action of the next round until a preset event occurs.
2. The zero-finding control method as claimed in claim 1, further comprising:
controlling the forming platform to move towards the exposure device until a plurality of preset target positions of the forming platform are acted;
And adjusting the levelness of the forming platform so that the difference value between acting forces received by all the preset target positions is smaller than a preset threshold value.
3. The zero-finding control method according to claim 1, characterized by further comprising:
controlling the forming platform to move for the first time until the forming platform and the exposure device are in a bonding state; wherein, in the primary moving process, no printing material is arranged in a tray arranged between the forming platform and the exposure device.
4. The zero-finding control method according to claim 1, wherein controlling the molding stage to move to a preset position comprises:
acquiring the primary moving distance of the forming platform, and controlling the lifting mechanism of the 3D printer to move according to the primary moving distance and the current printing layer number so as to enable the forming platform to move to the preset position; wherein the current number of printing layers is an integer greater than or equal to 0.
5. The zero-finding control method according to claim 1, wherein the fit state is confirmed according to one or more of the following values: the first displacement amount of the exposure device, the first pressure amount received by the exposure device, the second displacement amount of the molding platform, and the second pressure amount received by the molding platform.
6. The zero-finding control method according to claim 1, wherein the preset event includes completion of printing action of a preset number of layers and/or current molding surface of the molding stage is parallel to a floating substrate of the exposure apparatus.
7. The zero-finding control method according to claim 1, characterized in that before controlling the exposure device of the 3D printer to expose to light to form an initial print layer, the method further comprises:
in the process of downward movement of the forming platform, acquiring the maximum displacement and the minimum displacement in the first displacement of the exposure device, and determining that the forming platform is attached to the exposure device under the condition that the maximum displacement meets a first condition and the minimum displacement meets a second condition; or alternatively
And in the process of downward movement of the forming platform, acquiring the maximum displacement and the minimum displacement in the second displacement of the forming platform, and determining that the forming platform is attached to the exposure device under the condition that the maximum displacement meets a third condition and the minimum displacement meets a fourth condition.
8. The zero-finding control method according to claim 7, wherein the first condition includes falling into a first interval or being smaller than a first threshold value, and the second condition includes falling into a second interval or being larger than a second threshold value or maintaining a duration falling into the second interval for a preset duration; the third condition includes falling into a third interval or being smaller than a third threshold value, and the fourth condition includes falling into a fourth interval or being larger than a fourth threshold value or maintaining a duration falling into the fourth interval for a preset duration.
9. The zero-finding control method according to claim 1, characterized in that before controlling the exposure device of the 3D printer to expose to light to form an initial print layer, the method further comprises:
acquiring the maximum pressure and the minimum pressure in the first pressure received by the exposure device in the process of downward movement of the forming platform, and determining that the forming platform is attached to the exposure device under the condition that the maximum pressure meets a fifth condition and the minimum pressure meets a sixth condition; or,
and acquiring the maximum pressure and the minimum pressure in the second pressure received by the forming platform in the process of downward movement of the forming platform, and determining that the forming platform is attached to the exposure device under the condition that the maximum pressure meets a seventh condition and the minimum pressure meets an eighth condition.
10. The zero-finding control method according to claim 9, wherein the fifth condition includes falling within a fifth region or being smaller than a fifth threshold value, the sixth condition includes falling within a sixth region or being larger than a sixth threshold value, the seventh condition includes falling within a seventh region or being smaller than a seventh threshold value, and the eighth condition includes falling within an eighth region or being larger than an eighth threshold value.
11. The zero-finding control method according to claim 1, characterized in that before controlling the exposure device of the 3D printer to expose to light to form an initial print layer, the method further comprises:
controlling the forming platform to move downwards by a target distance according to a preset speed;
and after the forming platform moves down by the target distance, controlling the forming platform to continue to move down until the forming platform and the exposure device are in a bonding state.
12. The zero-finding control method as claimed in claim 11, wherein controlling the forming stage to move down by a target distance at a preset speed comprises:
and controlling the forming platform to move down by different distance segments according to different speeds, wherein the sum of the different distance segments moving down is the target distance.
13. The zero-finding control method as claimed in claim 11, wherein after the molding stage moves down by a target distance, before the molding stage is controlled to continue to move down, the method further comprising:
and detecting residues in the trough of the 3D printer, and executing the step of controlling the forming platform to continue moving downwards under the condition that the residue detection result is qualified.
14. The zero-finding control method according to claim 1, characterized in that before or simultaneously or after controlling the exposure device of the 3D printer to expose to light to form an initial print layer, the method further comprises:
Applying a reducing force to the exposure device under the condition that the angle between the exposure device and the horizontal plane is in a change state and the angle between the forming platform and the horizontal plane is fixed, wherein the reducing force is force for promoting the reducing of the inclination angle of the exposure device after the inclination angle of the exposure device is changed; or,
and under the condition that the angle between the forming platform and the horizontal plane is in a change state, applying a reducing force to the forming platform under the condition that the angle between the exposure device and the horizontal plane is fixed, wherein the reducing force is force for promoting the reducing of the inclination angle of the forming platform after the inclination angle of the forming platform is changed.
15. The zero-finding control method as claimed in claim 1, further comprising:
and locking the forming platform or the exposure device under the condition that the preset event occurs.
16. The 3D printer is characterized by comprising a memory, a processor, a forming platform, a material tray, an exposure device, a mounting seat and an elastic piece for providing reducing force; the forming platform, the material tray and the exposure device are sequentially arranged along a first direction; the exposure device comprises a mounting seat and a screen assembly; the screen assembly is movably arranged on the mounting seat along the first direction and comprises a mounting bracket and a screen fixed on the mounting bracket, an elastic piece is further arranged on the mounting seat, and the elastic piece is propped between the mounting bracket and the mounting seat along the first direction; the memory stores a computer program which, when executed by a processor, performs the method of any one of claims 1 to 15.
17. The 3D printer of claim 16, further comprising a sensor for acquiring a first amount of displacement of the exposure device or a second amount of displacement of the build platform or a first amount of pressure of the exposure device or a second amount of pressure of the build platform.
18. A storage medium having a computer program stored therein, wherein the computer program when executed by a processor performs the method of any of claims 1 to 15.
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| CN116353048A (en) * | 2023-03-30 | 2023-06-30 | 深圳市纵维立方科技有限公司 | Printing control method, storage medium, and photo-curing printer |
| CN118322575A (en) * | 2024-04-01 | 2024-07-12 | 深圳市纵维立方科技有限公司 | Release control method, three-dimensional model slicing method, equipment and medium |
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| CN115674689A (en) | 2023-02-03 |
| CN116277980B (en) | 2024-09-27 |
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