CN111070692A - FFF (fringe field switching) technology 3D (three-dimensional) printing system and method - Google Patents
FFF (fringe field switching) technology 3D (three-dimensional) printing system and method Download PDFInfo
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- CN111070692A CN111070692A CN202010016165.3A CN202010016165A CN111070692A CN 111070692 A CN111070692 A CN 111070692A CN 202010016165 A CN202010016165 A CN 202010016165A CN 111070692 A CN111070692 A CN 111070692A
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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
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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
- 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
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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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Abstract
The application discloses FFF technique 3D printing system. The system comprises: the interaction device is used for sending out a first control signal or a second control signal based on the installed application processing software; the processor is electrically connected with the interaction device and used for receiving the first control signal or the second control signal; the first combination device is connected with the processor and used for printing according to the first control signal to obtain a first printing model; and the second combination device is connected with the processor and is used for printing according to the second control signal to obtain the first strengthening part of the first printing model. The technical problem that double nozzles interfere with each other or cannot normally print is solved.
Description
Technical Field
The application relates to the field of 3D printing, in particular to a 3D printing system and method based on FFF technology.
Background
The FFF technology 3D printer is applied to industries such as art creativity, education, jewelry, molds, aerospace, medical treatment and the like.
The inventor finds that the conventional FFF technology 3D printer can only print engineering plastic models generally, the connection strength is relatively low, and when the printing models are required to be connected with other products and bear a certain load, the conventional FFF technology 3D printer cannot meet the use requirement.
In addition, if the FFF technology 3D printer uses high-strength materials to meet the requirements of printing model strength and the like, the printing cost is very large, for example, the PEEK material of BASF can reach $ 2000/kg, while the cost is greatly different due to the fact that the ABS material which is commonly known in China is 200 RMB/kg.
The FFF technology 3D printer can be provided with the same feeding system and the double-nozzle device, so that two consumables can be printed, but the technology exists in the same system, if materials with the temperature difference of more than 60 degrees or different solid and liquid materials are printed, the printing can be interfered or cannot be printed at all, and in addition, when the nozzles are used for printing, the influence of scraping or overflowing and the like can be possibly generated by the other nozzle.
Aiming at the problem that the double nozzles in the related technology are easy to interfere with each other or cannot print normally, an effective overall solution is not provided at present.
Disclosure of Invention
The application mainly aims to provide a FFF (fringe field switching) technology 3D printing system and method so as to solve the problem that double nozzles are easy to interfere with each other or cannot print normally.
To achieve the above object, according to one aspect of the present application, there is provided an FFF technique 3D printing system.
The FFF technology 3D printing system according to the application comprises: the interaction device is used for sending out a first control signal or a second control signal based on the installed application processing software; the processor is electrically connected with the interaction device and used for receiving the first control signal or the second control signal; the first combination device is connected with the processor and used for printing according to the first control signal to obtain a first printing model; and the second combination device is connected with the processor and is used for printing according to the second control signal to obtain the first strengthening part of the first printing model.
Further, the method also comprises the following steps: the leveling device is used for detecting a trigger signal; the interaction device is further used for sending out a third control signal based on the application processing software when the trigger signal is detected; the processor is further configured to receive the third control signal, and perform offset calibration and leveling according to the third control signal in cooperation with the driving device, the first combining device and the second combining device.
Further, the interaction device is a touch display device.
Further, the first combining means includes: the device comprises a driving device, a printing platform, an XY-axis moving device, a Z-axis moving device and a first extruding device, wherein the printing platform is connected with the Z-axis moving device, and the first extruding device is connected with the XY-axis moving device; the XY-axis movement device and the Z-axis movement device are connected with the driving device.
Further, the second combining means includes: the device comprises a driving device, a printing platform, an XY-axis moving device, a Z-axis moving device and a second extruding device, wherein the printing platform is connected with the Z-axis moving device, and the second extruding device is connected with the XY-axis moving device; the XY-axis movement device and the Z-axis movement device are connected with the driving device.
Further, the driving device is a driving motor set.
Further, the leveling device is a leveling sensor.
In order to achieve the above object, according to another aspect of the present application, there is provided an FFF technique 3D printing method.
The FFF technology 3D printing method comprises the following steps: receiving a first control signal sent by the interactive device based on the installed application processing software; controlling the first combination device to print according to the first control signal to obtain a first printing model; receiving a second control signal sent by the interaction device based on the installed application processing software; and controlling a second combination device to print according to the second control signal to obtain a first reinforcing part of the first printing model.
Further, the method also comprises the following steps: receiving a third control signal sent by the leveling device based on the application processing software when the leveling device detects the trigger signal; and matching the driving device, the first combination device and the second combination device according to the third control signal to perform offset calibration leveling.
In the embodiment of the application, a first printing model is obtained by printing according to the first control signal through a first combination device connected with the processor in a mode of adopting two mutually independent extrusion devices; the second combination device is connected with the processor and used for obtaining a first strengthening part of the first printing model by printing according to the second control signal; the purpose of mutually independent control of matching the first combination device and the second combination device to complete model printing and strengthening is achieved, the technical effect that double-nozzle mutual interference is easy or normal printing cannot be achieved is achieved, and the technical problem that double-nozzle mutual interference is easy or normal printing cannot be achieved is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a block diagram of a configuration of an FFF technology 3D printing system according to a first embodiment of the present application;
fig. 2 is a block diagram of a configuration of an FFF technology 3D printing system according to a second embodiment of the present application;
fig. 3 is a schematic flow chart of a FFF technique 3D printing method according to a first embodiment of the present application;
fig. 4 is a schematic flow chart of a FFF technique 3D printing method according to a second embodiment of the present application;
fig. 5 is a schematic structural diagram of the FFF technology 3D printing system and method according to the preferred embodiment of the present application.
Reference numerals
1. An interaction device; 2. a processor; 3. a first combining means; 4. a second combining means; 5. a leveling device; 6. a drive device; 7. a printing platform; 8. an XY-axis motion device; 9. a Z-axis motion device; 10. a first extrusion device; 11. a second extrusion device.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. 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.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 5, the present application relates to an FFF technology 3D printing system, which includes:
the interactive device 1 is used for sending out a first control signal or a second control signal based on the installed application processing software;
preferably, in this embodiment, the interaction device 1 is a touch display device. The application processing software is installed in the processor 2, and an operating system is installed in the processor 2; when the application processing software is opened, the user may send the first control signal or the second control signal to the processor 2 by touching, clicking, or the like in the interface of the touch display device.
Specifically, when the "normal mode" is clicked in the interface, the processor 2 calls a corresponding control program from the memory as a first control signal; clicking the "special mode" in the interface, the processor 2 will call the corresponding control program in the memory as the second control signal.
Therefore, human-computer interaction can be realized, the control signal is sent out through the human-computer interaction, and the control of the specific printing process is guaranteed.
The processor 2 is electrically connected with the interaction device 1 and is used for receiving the first control signal or the second control signal;
the processor 2 receives a first control signal or a second control signal obtained by the user through the operation of the interaction device 1, and further provides guarantee for controlling other equipment to finish printing.
The first combination device 3 is connected with the processor 2 and is used for printing according to the first control signal to obtain a first printing model;
the first combining means 3, which is preferable in the present embodiment, includes: the device comprises a driving device 6, a printing platform 7, an XY axis movement device 8, a Z axis movement device 9 and a first extrusion device 10, wherein the printing platform 7 is connected with the Z axis movement device 9, and the first extrusion device 10 is connected with the XY axis movement device 8; the XY-axis movement device 8 and the Z-axis movement device 9 are connected with the driving device 6.
Preferably, in this embodiment, the driving device 6 is a driving motor set.
The first control signal is a signal for controlling the operation of the first combination device 3; the specific control flow is as follows: firstly, controlling a driving motor to rotate, driving an XY-axis movement device 8 and a Z-axis movement device 9 to move in X, Y or Z-axis direction according to a preset program, and driving a printing platform 7 and a first extrusion device 10 to move; during the moving process, the first extruding device 10 extrudes a first material (common material, such as engineering plastic) according to a preset program to print the printing model, until the printing of the printing model is completed, or after a part of the printing model is obtained, a preset period condition is reached, and the printing action of the first combining device 3 is stopped.
And the second combination device 4 is connected with the processor 2 and is used for printing a first reinforced part of the first printing model according to the second control signal.
The second combining means 4 preferred in the present embodiment includes: the device comprises a driving device 6, a printing platform 7, an XY axis movement device 8, a Z axis movement device 9 and a second extrusion device 11, wherein the printing platform 7 is connected with the Z axis movement device 9, and the second extrusion device 11 is connected with the XY axis movement device 8; the XY-axis movement device 8 and the Z-axis movement device 9 are connected with the driving device 6.
Preferably, in this embodiment, the driving device 6 is a driving motor set.
The second control signal is a signal for controlling the action of the second combination device 4; the specific control flow is as follows: firstly, controlling the driving device 6 to rotate, driving the XY-axis moving device 8 and the Z-axis moving device 9 to move in X, Y or Z-axis direction according to a preset program, and driving the printing platform 7 and the first extruding device 10 to move; during the movement, the second extruding device 11 extrudes a second material (special material, such as carbon fiber, PEEK, glass fiber, liquid glue, ABS) according to a preset program to print the reinforced portion until the reinforced portion is printed, or the printing operation of the second combining device 4 is stopped when a preset period condition is reached after a part of the reinforced portion is printed.
It should be noted that the driving device 6, the printing platform 7, the XY-axis moving device 8, and the Z-axis moving device 9 are provided in the same equipment as the first combination device 3, that is, the first combination device 3 and the second combination device 4 share the above equipment.
In this embodiment, after printing a print model according to the first control signal, the reinforcement part may be printed on the print model according to the second control signal; thus, the local reinforcement is realized through the reinforcement part, so that the connection strength of the printing model can be greatly improved, and the relatively low cost can be effectively ensured only by using a small amount of high-strength materials; meanwhile, the first extrusion device 10 and the second extrusion device 11 are controlled and act independently, so that the situation that mutual interference is easy to occur in double nozzles, and even printing cannot be performed is avoided; even if materials with printing temperature difference of more than 60 degrees or different solid and liquid materials are arranged in one set of extrusion device, the mutual interference or the printing failure can not occur, and when one independent spray head is used for printing, the other spray head can not generate the influences of scraping or overflowing and the like.
In some embodiments, a partial model may be obtained by printing according to the first control signal, a partial reinforcement portion of the partial model may be printed according to the second control signal after the printing reaches a preset period, and the partial model may be continuously printed according to the first control signal after the printing reaches the preset period; thus, the operation is stopped until the printing model and the strengthening part are printed.
Preferably, the reinforcing part is a spiral strip-shaped reinforcing rib, so that the connection strength of the printing model can be effectively enhanced, and materials are saved.
From the above description, it can be seen that the following technical effects are achieved by the present application:
in the embodiment of the present application, two mutually independent extrusion devices are adopted, and the first combination device 3 connected to the processor 2 is used for printing according to the first control signal to obtain a first printing model; the second combination device 4 is connected with the processor 2 and is used for printing according to the second control signal to obtain a first strengthening part of the first printing model; the purpose of mutually independent control of matching the first combination device 3 and the second combination device 4 to complete model printing and strengthening is achieved, so that the technical effect of avoiding easy mutual interference or incapability of normal printing of the double-nozzle is achieved, and the technical problem of easy mutual interference or incapability of normal printing of the double-nozzle is solved.
As shown in fig. 2 and 5, the present embodiment preferably further includes:
the leveling device 5 is used for detecting a trigger signal;
the interaction device 1 is further configured to issue a third control signal based on the application processing software when the trigger signal is detected;
the processor 2 is further configured to receive the third control signal, and perform offset calibration leveling according to the third control signal in cooperation with the driving device 6, the first combining device 3, and the second combining device 4.
Preferably, in the present embodiment, the leveling device 5 is a leveling sensor.
As can be seen from the above, no matter what mode is adopted for printing, the first extrusion device 10 and the second extrusion device 11 will work alternately and independently, but each time of independent operation or when the extrusion devices are replaced (which can be detected by the leveling sensor), the relative flatness calibration cannot be performed quickly, and the printing efficiency and the printing success rate are affected; in order to solve the problem, the leveling device 5 is adopted to cooperate with application processing software of the processor 2 to obtain a third control signal, and the offset calibration leveling is carried out by cooperating with the driving device 6, the first combination device 3 and the second combination device 4 according to the third control signal; the leveling is realized quickly and automatically, and the printing efficiency and the printing success rate are greatly improved.
The specific leveling process is as follows:
left Z Offset calibration
Left Z Offset refers to the height difference of the Left nozzle from the bottom of the probe when the probe is triggered.
The calibration process accurately measures Left Z Offset with an error range of + -0.025mm
Operation of
step1 lifting the X-axis to the top for X-axis horizontal alignment
step2: moving the left nozzle to the center of the hot bed, lowering the probe, and lowering the x-axis until the probe is triggered
step3: the approximate distance of the left nozzle from the platform at this time was confirmed by a feeler gauge of 0.3mm and the x-axis of elevation
step 4: 16 lines with the same thickness but from low to high are printed in the central area of the platform, the line width is 0.8mm, the nozzle caliber is 0.4mm, and the material is selected from Raise3D PLA
step 5: final determination of the exact value of Left Z offset by selecting the first fully twisted line
step 6: lifting 0.5mm back to step4 if there is no fully twisted wire is performed again
If the line is all twisted, then go down 0.5mm and go back to step4 to perform again
The principle is as follows:
1. the purpose of carrying out X-axis horizontal direction calibration is to ensure that an X-axis beam is horizontal and prevent errors in subsequent steps caused by inclination
2. Transplanting the Left nozzle to the center of the hot bed, considering the central area of the hot bed as the flattest area because the magnet distribution central area of the hot bed has the strongest adsorption force, and selecting the middle point of the hot bed as the reference point for measuring Left Z offset
3. By determining the coarse value of Left Z Offset from 0.3mm feeler 0, the accurate value of Left Z Offset can be measured more quickly, and the nozzle height at this time is set to Z equal to 0
4. Starting with 16 lines printed from low to high, the z-axis step is Zstep, meaning that each line is printed higher than the previous line by Zstep mm. The first line height is printed from Zstart, which is an empirical value that has undergone a number of tests and from which printing can be more quickly measured to an accurate value.
5. The purpose of selecting a fully twisted wire is two:
a. shielding lines that are half-twisted due to uneven platforms
b. The method prevents the user from being unable to quantitatively judge the best printed line, so that the user abandons the selection of the best printed line and selects the first completely distorted line, thereby shielding the subjective factors of the user
We then select the first fully distorted line and based on our extensive testing we found that the first fully distorted line was Z1 higher than the best printed line, from which empirical value we can deduce the height of the best printed line. The accurate value of Left Z offset can be calculated by the following formula
Offset＝Offset0-Zstart-(Zstep*Index)+Z0+Z1；
Offset is accurate value of Left Z Offset
Offset0 raw value of Left Z Offset measured at step3
Zstart height of first line
Zstep height difference between two adjacent lines
Index-the sequence of the first fully twisted wire minus 1
Z0 printing optimal line height from the platform (empirical values over extensive testing)
Z1 height Difference of first fully twisted line from optimally printed line
Right Z Offset calibration
Right Z Offset refers to the height difference of the Right nozzle from the bottom of the probe when the probe is triggered.
The calibration process accurately measures Right Z Offset with an error range of + -0.025mm
Operation of
step1 lifting the X-axis to the top for X-axis horizontal alignment
step2: moving the left nozzle to the center of the hot bed, putting down the probe, descending the x axis until the probe is triggered, returning the left nozzle to move the right nozzle to the center of the hot bed
step3: the approximate distance of the right nozzle from the platform at this time was confirmed by a feeler gauge of 0.3mm and the x-axis of elevation
step 4: 16 lines with the same thickness but from low to high are printed in the central area of the platform, the line width is 0.8mm, the nozzle caliber is 0.4mm, and the material is selected from Raise3D PLA
step 5: final determination of the exact value of Right Z offset by selecting the first fully warped line
step 6: lifting 0.5mm back to step4 if there is no fully twisted wire is performed again
If the line is all twisted, then go down 0.5mm and go back to step4 to perform again
The principle is as follows:
1. the purpose of carrying out X-axis horizontal direction calibration is to ensure that an X-axis beam is horizontal and prevent errors in subsequent steps caused by inclination
2. The Right nozzle is transplanted to the center of the hot bed, the central area of the hot bed is considered to be the flattest area because the magnet distribution central area of the hot bed has the strongest adsorption force, and the middle point of the hot bed is selected as the reference point for measuring the Right Z offset
3. By determining the coarse value of Right Z Offset, Offset0, using a 0.3mm feeler gauge, the exact value of Right Z Offset can be measured more quickly, setting the nozzle height at this time to Z equal to 0
4. Starting with 16 lines printed from low to high, the z-axis step is Zstep, meaning that each line is printed higher than the previous line by Zstep mm. The first line height is printed from Zstart, which is an empirical value that has undergone a number of tests and from which printing can be more quickly measured to an accurate value.
5. The purpose of selecting a fully twisted wire is two:
a. shielding lines that are half-twisted due to uneven platforms
b. The method prevents the user from being unable to quantitatively judge the best printed line, so that the user abandons the selection of the best printed line and selects the first completely distorted line, thereby shielding the subjective factors of the user
We then select the first fully distorted line and based on our extensive testing we found that the first fully distorted line was Z1 higher than the best printed line, from which empirical value we can deduce the height of the best printed line. The exact value of Right Z offset can be calculated using the following formula
Offset＝Offset0-Zstart-(Zstep*Index)+Z0+Z1；
Right Z Offset accurate value
Offset0 raw value of Left Z Offset measured at step3
Zstart height of first line
Zstep height difference between two adjacent lines
Index-the sequence of the first fully twisted wire minus 1
Z0 printing optimal line height from the platform (empirical values over extensive testing)
Z1 height Difference of first fully twisted line from optimally printed line
Right nozzle XY Offset calibration
The right nozzle XY Offset is an Offset value of the right nozzle with respect to the left nozzle in X and Y directions when the right nozzle and the left nozzle reach the same coordinates
Operation of
step1 printing XY offset calibration model
step2 selection of X-direction aligned lines
step3 selection of Y-direction aligned lines
The principle is as follows:
x Offset-the X coordinates of the left and right nozzles are the same at 0. From 0 to the positive X direction, the X coordinate of the right nozzle is 0.1,0.2 and 0.3 … 0.8.8 less than the X coordinate of the left nozzle in sequence, and the step is 0.1 mm. From 0 to the negative X direction, the X coordinate of the right nozzle is 0.1mm, 0.2 mm and 0.3 … 0.8mm larger than the X coordinate of the left nozzle in sequence, and the step is 0.1 mm.
Assuming the lines of the left and right nozzles at +3 are aligned, X Offset is +0.3 mm. Assuming the lines of the left and right nozzles at-3 are aligned, X Offset is-0.3 mm.
Y Offset-the Y coordinates of the left and right nozzles are the same at 0. From 0 to the positive Y direction, the Y coordinate of the right nozzle is 0.1,0.2 and 0.3 … 0.8.8 less than the Y coordinate of the left nozzle in sequence, and the step is 0.1 mm. From 0 to Y negative direction, the Y coordinate of the right nozzle is 0.1mm, 0.2 mm and 0.3 … 0.8mm larger than that of the left nozzle in sequence, and the step is 0.1 mm.
Assuming that the lines of the left and right nozzles at +3 are aligned, Y Offset is +0.3 mm. Assuming the lines of the left and right nozzles at-3 are aligned, Y Offset is-0.3 mm.
As shown in fig. 3 and 5, the present application also relates to a 3D printing method by FFF technology, which includes the following steps:
step S100, receiving a first control signal sent by application processing software installed on the interactive device 1;
step S102, controlling the first combination device 3 to print according to the first control signal to obtain a first printing model;
step S104, receiving a second control signal sent by the interactive device 1 based on the installed application processing software;
and step S106, controlling the second combination device 4 to print according to the second control signal to obtain a first reinforced part of the first printing model.
Preferably, in this embodiment, the interaction device 1 is a touch display device. The application processing software is installed in the processor 2, and an operating system is installed in the processor 2; when the application processing software is opened, the user may send the first control signal or the second control signal to the processor 2 by touching, clicking, or the like in the interface of the touch display device.
Specifically, when the "normal mode" is clicked in the interface, the processor 2 calls a corresponding control program from the memory as a first control signal; clicking the "special mode" in the interface, the processor 2 will call the corresponding control program in the memory as the second control signal.
Therefore, human-computer interaction can be realized, the control signal is sent out through the human-computer interaction, and the control of the specific printing process is guaranteed.
The processor 2 receives a first control signal or a second control signal obtained by the user through the operation of the interaction device 1, and further provides guarantee for controlling other equipment to finish printing.
The first combining means 3, which is preferable in the present embodiment, includes: the device comprises a driving device 6, a printing platform 7, an XY axis movement device 8, a Z axis movement device 9 and a first extrusion device 10, wherein the printing platform 7 is connected with the Z axis movement device 9, and the first extrusion device 10 is connected with the XY axis movement device 8; the XY-axis movement device 8 and the Z-axis movement device 9 are connected with the driving device 6.
Preferably, in this embodiment, the driving device 6 is a driving motor set.
The first control signal is a signal for controlling the operation of the first combination device 3; the specific control flow is as follows: firstly, controlling a driving motor to rotate, driving an XY-axis movement device 8 and a Z-axis movement device 9 to move in X, Y or Z-axis direction according to a preset program, and driving a printing platform 7 and a first extrusion device 10 to move; during the moving process, the first extruding device 10 extrudes a first material (common material, such as engineering plastic) according to a preset program to print the printing model, until the printing of the printing model is completed, or after a part of the printing model is obtained, a preset period condition is reached, and the printing action of the first combining device 3 is stopped.
The second combining means 4 preferred in the present embodiment includes: the device comprises a driving device 6, a printing platform 7, an XY axis movement device 8, a Z axis movement device 9 and a second extrusion device 11, wherein the printing platform 7 is connected with the Z axis movement device 9, and the second extrusion device 11 is connected with the XY axis movement device 8; the XY-axis movement device 8 and the Z-axis movement device 9 are connected with the driving device 6.
Preferably, in this embodiment, the driving device 6 is a driving motor set.
The second control signal is a signal for controlling the action of the second combination device 4; the specific control flow is as follows: firstly, controlling the driving device 6 to rotate, driving the XY-axis moving device 8 and the Z-axis moving device 9 to move in X, Y or Z-axis direction according to a preset program, and driving the printing platform 7 and the first extruding device 10 to move; during the movement, the second extruding device 11 extrudes a second material (special material, such as carbon fiber, PEEK, glass fiber, liquid glue, ABS) according to a preset program to print the reinforced portion until the reinforced portion is printed, or the printing operation of the second combining device 4 is stopped when a preset period condition is reached after a part of the reinforced portion is printed.
It should be noted that the driving device 6, the printing platform 7, the XY-axis moving device 8, and the Z-axis moving device 9 are provided in the same equipment as the first combination device 3, that is, the first combination device 3 and the second combination device 4 share the above equipment.
In this embodiment, after printing a print model according to the first control signal, the reinforcement part may be printed on the print model according to the second control signal; thus, the local reinforcement is realized through the reinforcement part, so that the connection strength of the printing model can be greatly improved, and the relatively low cost can be effectively ensured only by using a small amount of high-strength materials; meanwhile, the first extrusion device 10 and the second extrusion device 11 are controlled and act independently, so that the situation that mutual interference is easy to occur in double nozzles, and even printing cannot be performed is avoided; even if materials with printing temperature difference of more than 60 degrees or different solid and liquid materials are arranged in one set of extrusion device, the mutual interference or the printing failure can not occur, and when one independent spray head is used for printing, the other spray head can not generate the influences of scraping or overflowing and the like.
In some embodiments, a partial model may be obtained by printing according to the first control signal, a partial reinforcement portion of the partial model may be printed according to the second control signal after the printing reaches a preset period, and the partial model may be continuously printed according to the first control signal after the printing reaches the preset period; thus, the operation is stopped until the printing model and the strengthening part are printed.
Preferably, the reinforcing part is a spiral strip-shaped reinforcing rib, so that the connection strength of the printing model can be effectively enhanced, and materials are saved.
From the above description, it can be seen that the following technical effects are achieved by the present application:
in the embodiment of the present application, two mutually independent extrusion devices are adopted, and the first combination device 3 connected to the processor 2 is used for printing according to the first control signal to obtain a first printing model; the second combination device 4 is connected with the processor 2 and is used for printing according to the second control signal to obtain a first strengthening part of the first printing model; the purpose of mutually independent control of matching the first combination device 3 and the second combination device 4 to complete model printing and strengthening is achieved, so that the technical effect of avoiding easy mutual interference or incapability of normal printing of the double-nozzle is achieved, and the technical problem of easy mutual interference or incapability of normal printing of the double-nozzle is solved.
As shown in fig. 4 and 5, the present embodiment preferably further includes the following steps:
step S108, receiving a third control signal sent out based on the application processing software when the leveling device 5 detects a trigger signal;
and step S110, performing offset calibration leveling by matching the driving device 6, the first combination device 3 and the second combination device 4 according to the third control signal.
Preferably, in the present embodiment, the leveling device 5 is a leveling sensor.
As can be seen from the above, no matter what mode is adopted for printing, the first extrusion device 10 and the second extrusion device 11 will work alternately and independently, but each time of independent operation or when the extrusion devices are replaced (which can be detected by the leveling sensor), the relative flatness calibration cannot be performed quickly, and the printing efficiency and the printing success rate are affected; in order to solve the problem, the leveling device 5 is adopted to cooperate with application processing software of the processor 2 to obtain a third control signal, and the offset calibration leveling is carried out by cooperating with the driving device 6, the first combination device 3 and the second combination device 4 according to the third control signal; the leveling is realized quickly and automatically, and the printing efficiency and the printing success rate are greatly improved.
The specific leveling process is as follows:
left Z Offset calibration
Left Z Offset refers to the height difference of the Left nozzle from the bottom of the probe when the probe is triggered.
The calibration process accurately measures Left Z Offset with an error range of + -0.025mm
Operation of
step1 lifting the X-axis to the top for X-axis horizontal alignment
step2: moving the left nozzle to the center of the hot bed, lowering the probe, and lowering the x-axis until the probe is triggered
step3: the approximate distance of the left nozzle from the platform at this time was confirmed by a feeler gauge of 0.3mm and the x-axis of elevation
step 4: 16 lines with the same thickness but from low to high are printed in the central area of the platform, the line width is 0.8mm, the nozzle caliber is 0.4mm, and the material is selected from Raise3D PLA
step 5: final determination of the exact value of Left Z offset by selecting the first fully twisted line
step 6: lifting 0.5mm back to step4 if there is no fully twisted wire is performed again
If the line is all twisted, then go down 0.5mm and go back to step4 to perform again
The principle is as follows:
1. the purpose of carrying out X-axis horizontal direction calibration is to ensure that an X-axis beam is horizontal and prevent errors in subsequent steps caused by inclination
2. Transplanting the Left nozzle to the center of the hot bed, considering the central area of the hot bed as the flattest area because the magnet distribution central area of the hot bed has the strongest adsorption force, and selecting the middle point of the hot bed as the reference point for measuring Left Z offset
3. By determining the coarse value of Left Z Offset from 0.3mm feeler 0, the accurate value of Left Z Offset can be measured more quickly, and the nozzle height at this time is set to Z equal to 0
4. Starting with 16 lines printed from low to high, the z-axis step is Zstep, meaning that each line is printed higher than the previous line by Zstep mm. The first line height is printed from Zstart, which is an empirical value that has undergone a number of tests and from which printing can be more quickly measured to an accurate value.
5. The purpose of selecting a fully twisted wire is two:
a. shielding lines that are half-twisted due to uneven platforms
b. The method prevents the user from being unable to quantitatively judge the best printed line, so that the user abandons the selection of the best printed line and selects the first completely distorted line, thereby shielding the subjective factors of the user
We then select the first fully distorted line and based on our extensive testing we found that the first fully distorted line was Z1 higher than the best printed line, from which empirical value we can deduce the height of the best printed line. The accurate value of Left Z offset can be calculated by the following formula
Offset＝Offset0-Zstart-(Zstep*Index)+Z0+Z1；
Offset is accurate value of Left Z Offset
Offset0 raw value of Left Z Offset measured at step3
Zstart height of first line
Zstep height difference between two adjacent lines
Index-the sequence of the first fully twisted wire minus 1
Z0 printing optimal line height from the platform (empirical values over extensive testing)
Z1 height Difference of first fully twisted line from optimally printed line
Right Z Offset calibration
Right Z Offset refers to the height difference of the Right nozzle from the bottom of the probe when the probe is triggered.
The calibration process accurately measures Right Z Offset with an error range of + -0.025mm
Operation of
step1 lifting the X-axis to the top for X-axis horizontal alignment
step2: moving the left nozzle to the center of the hot bed, putting down the probe, descending the x axis until the probe is triggered, returning the left nozzle to move the right nozzle to the center of the hot bed
step3: the approximate distance of the right nozzle from the platform at this time was confirmed by a feeler gauge of 0.3mm and the x-axis of elevation
step 4: 16 lines with the same thickness but from low to high are printed in the central area of the platform, the line width is 0.8mm, the nozzle caliber is 0.4mm, and the material is selected from Raise3D PLA
step 5: final determination of the exact value of Right Z offset by selecting the first fully warped line
step 6: lifting 0.5mm back to step4 if there is no fully twisted wire is performed again
If the line is all twisted, then go down 0.5mm and go back to step4 to perform again
The principle is as follows:
1. the purpose of carrying out X-axis horizontal direction calibration is to ensure that an X-axis beam is horizontal and prevent errors in subsequent steps caused by inclination
2. The Right nozzle is transplanted to the center of the hot bed, the central area of the hot bed is considered to be the flattest area because the magnet distribution central area of the hot bed has the strongest adsorption force, and the middle point of the hot bed is selected as the reference point for measuring the Right Z offset
3. By determining the coarse value of Right Z Offset, Offset0, using a 0.3mm feeler gauge, the exact value of Right Z Offset can be measured more quickly, setting the nozzle height at this time to Z equal to 0
4. Starting with 16 lines printed from low to high, the z-axis step is Zstep, meaning that each line is printed higher than the previous line by Zstep mm. The first line height is printed from Zstart, which is an empirical value that has undergone a number of tests and from which printing can be more quickly measured to an accurate value.
5. The purpose of selecting a fully twisted wire is two:
a. shielding lines that are half-twisted due to uneven platforms
b. The method prevents the user from being unable to quantitatively judge the best printed line, so that the user abandons the selection of the best printed line and selects the first completely distorted line, thereby shielding the subjective factors of the user
We then select the first fully distorted line and based on our extensive testing we found that the first fully distorted line was Z1 higher than the best printed line, from which empirical value we can deduce the height of the best printed line. The exact value of Right Z offset can be calculated using the following formula
Offset＝Offset0-Zstart-(Zstep*Index)+Z0+Z1；
Right Z Offset accurate value
Offset0 raw value of Left Z Offset measured at step3
Zstart height of first line
Zstep height difference between two adjacent lines
Index-the sequence of the first fully twisted wire minus 1
Z0 printing optimal line height from the platform (empirical values over extensive testing)
Z1 height Difference of first fully twisted line from optimally printed line
Right nozzle XY Offset calibration
The right nozzle XY Offset is an Offset value of the right nozzle with respect to the left nozzle in X and Y directions when the right nozzle and the left nozzle reach the same coordinates
Operation of
step1 printing XY offset calibration model
step2 selection of X-direction aligned lines
step3 selection of Y-direction aligned lines
The principle is as follows:
x Offset-the X coordinates of the left and right nozzles are the same at 0. From 0 to the positive X direction, the X coordinate of the right nozzle is 0.1,0.2 and 0.3 … 0.8.8 less than the X coordinate of the left nozzle in sequence, and the step is 0.1 mm. From 0 to the negative X direction, the X coordinate of the right nozzle is 0.1mm, 0.2 mm and 0.3 … 0.8mm larger than the X coordinate of the left nozzle in sequence, and the step is 0.1 mm.
Assuming the lines of the left and right nozzles at +3 are aligned, X Offset is +0.3 mm. Assuming the lines of the left and right nozzles at-3 are aligned, X Offset is-0.3 mm.
Y Offset-the Y coordinates of the left and right nozzles are the same at 0. From 0 to the positive Y direction, the Y coordinate of the right nozzle is 0.1,0.2 and 0.3 … 0.8.8 less than the Y coordinate of the left nozzle in sequence, and the step is 0.1 mm. From 0 to Y negative direction, the Y coordinate of the right nozzle is 0.1mm, 0.2 mm and 0.3 … 0.8mm larger than that of the left nozzle in sequence, and the step is 0.1 mm.
Assuming that the lines of the left and right nozzles at +3 are aligned, Y Offset is +0.3 mm. Assuming the lines of the left and right nozzles at-3 are aligned, Y Offset is-0.3 mm.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A FFF technology 3D printing system, comprising:
the interaction device is used for sending out a first control signal or a second control signal based on the installed application processing software;
the processor is electrically connected with the interaction device and used for receiving the first control signal or the second control signal;
the first combination device is connected with the processor and used for printing according to the first control signal to obtain a first printing model;
and the second combination device is connected with the processor and is used for printing according to the second control signal to obtain the first strengthening part of the first printing model.
2. The FFF technology 3D printing system of claim 1, further comprising:
the leveling device is used for detecting a trigger signal;
the interaction device is further used for sending out a third control signal based on the application processing software when the trigger signal is detected;
the processor is further configured to receive the third control signal, and perform offset calibration and leveling according to the third control signal in cooperation with the driving device, the first combining device and the second combining device.
3. The FFF technology 3D printing system of claim 1, the interaction device being a touch display device.
4. The FFF technology 3D printing system of claim 1, the first combining means comprising: the device comprises a driving device, a printing platform, an XY-axis moving device, a Z-axis moving device and a first extruding device, wherein the printing platform is connected with the Z-axis moving device, and the first extruding device is connected with the XY-axis moving device; the XY-axis movement device and the Z-axis movement device are connected with the driving device.
5. The FFF technology 3D printing system of claim 1, the second combining means comprising: the device comprises a driving device, a printing platform, an XY-axis moving device, a Z-axis moving device and a second extruding device, wherein the printing platform is connected with the Z-axis moving device, and the second extruding device is connected with the XY-axis moving device; the XY-axis movement device and the Z-axis movement device are connected with the driving device.
6. The FFF technique 3D printing system of claim 4 or 5, the drive means being a drive motor set.
7. The FFF technology 3D printing system of claim 1, the leveling device being a leveling sensor.
8. A FFF technology 3D printing method is characterized by comprising the following steps:
receiving a first control signal sent by the interactive device based on the installed application processing software;
controlling the first combination device to print according to the first control signal to obtain a first printing model;
receiving a second control signal sent by the interaction device based on the installed application processing software;
and controlling a second combination device to print according to the second control signal to obtain a first reinforcing part of the first printing model.
9. The FFF technique 3D printing method according to claim 8, further comprising the steps of:
receiving a third control signal sent by the leveling device based on the application processing software when the leveling device detects the trigger signal;
and matching the driving device, the first combination device and the second combination device according to the third control signal to perform offset calibration leveling.
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Application publication date: 20200428 |