CN113715328A - Printing method for automatic random disturbance of ink gun of 3D printer - Google Patents
Printing method for automatic random disturbance of ink gun of 3D printer Download PDFInfo
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- CN113715328A CN113715328A CN202110897079.2A CN202110897079A CN113715328A CN 113715328 A CN113715328 A CN 113715328A CN 202110897079 A CN202110897079 A CN 202110897079A CN 113715328 A CN113715328 A CN 113715328A
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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
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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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
- B33Y10/00—Processes of additive manufacturing
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Abstract
The invention discloses a printing method of automatic random disturbance of an ink gun of a 3D printer, which comprises the following steps: s1, automatically taking a random integer N; s2, the ink jet head of the 3D printer deviates by N jet hole positions relative to the printing reference point; s3, unbinding the binding between the printing position corresponding to the printing data and the jet hole position, reversely offsetting the printing position corresponding to the printing data by the positions of N jet holes along the offset direction of the ink gun, and after offsetting, rebinding the printing position corresponding to the current layer of printing data and the jet hole position; s4, printing the current layer; s5, repeating the steps S1-S4, and continuing to print the next layer until the printing is finished; the ink-jet head is randomly shifted during printing on each layer, but the position of the actually printed pattern is still consistent with the position printed by the ink-jet head before shifting, and the product defects caused by the jet orifice defects are dispersed through the random shifting of the ink-jet head, so that the product can be normally formed.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a printing method for automatic random disturbance of an ink gun of a 3D printer.
Background
The 3D printing is a high and new manufacturing technology based on a material accumulation method, and according to three-dimensional model data designed by a computer, parts with complex shapes which are difficult to finish by the traditional process can be manufactured in a material accumulation mode through a forming device.
Three-dimensional jet Printing (3 DP), also known as Binder Jetting (BJ), is one of the most viable additive manufacturing technologies for 3D Printing. The technology is based on a droplet jetting principle, utilizes an ink jet head to selectively jet a liquid adhesive, and prints (piles) discrete powder materials layer by layer according to paths to form, so as to obtain a required workpiece.
The ink jet head is one of the core components of the 3DP printer, one ink jet head has thousands of jet holes, and some printers are provided with a plurality of ink jet heads, so that the number of the jet holes is more. In this plurality of orifices, it is almost impossible for all the orifices to operate perfectly at all times, and defects in individual orifices can occur from time to time, as exemplified below.
Example 1: when two ink jet heads are combined, the two ink jet heads should be perfectly seamless without overlapping, but because of various reasons, two jet holes are overlapped, and the saturation of the adhesive sprayed to the powder layer at the position where the two jet holes are overlapped is too high, which is not favorable for forming; in other cases, when two inkjet heads are spliced together, a blank of a nozzle hole is left, and the missing position of the nozzle hole is not sprayed with the adhesive to the powder surface, so that the forming failure is caused.
Example 2: the jet orifice always works normally, but impurities in the ink block part of the jet orifice outlet temporarily, the jet direction of the jet orifice is not vertical any more but inclined, the jet orifice is normally jetted to the row A but actually jetted to the row B, two problems are caused, the saturation of the row B is too high, and the row A is free of adhesive. After a period of operation, under the constant pressure of the ink jet system, the impurity is flushed out and the orifice returns to normal, all of which may not be known at all but the defect it produces in the formed part is true.
Example 3: it is known that some drawbacks are known, for example, if one determines that a certain nozzle hole C is blocked, then in the conventional method for normal printing, the row corresponding to each layer of nozzle holes C is free from adhesive, the empty rows are stacked in the height direction to form a face without adhesive, the forming member is split into two halves on both sides of the face, and thus the printer cannot be successfully formed at all, and only stops. The difficulty of replacing a new ink jet head is obvious, and the replaceable ink jet head is not immediately available, and then the replacement of the ink jet head is a tedious and delicate work which takes a long time, and finally the new ink jet head is expensive, and the frequent replacement can greatly increase the use cost.
When 3D printing is performed, problems can often occur by hitting these defects, either light or dark, or persistent or temporary, or known or unknown, affecting the printed product formation.
The Chinese patent with publication number CN107283818A discloses a secondary positioning method and structure for 3D printing material supplement, which comprises the following operation steps: 1) identifying the blockage condition of the nozzle at the nozzle head part, and determining the actual position of the blocked nozzle to obtain a primary positioning pattern layer; 2) each point in the primary positioning pattern layer is deviated 1-5 units leftwards/rightwards to obtain a secondary positioning material supplementing pattern layer; 3) keeping the position of the spray head part unchanged, adjusting the position of the printing bottom plate body according to the secondary positioning material supplementing pattern layer obtained in the step 2), and performing material supplementing printing according to the secondary positioning material supplementing pattern layer; 4) repeating the step 2) and the step 3) until feeding is completed. According to the supplementing printing method, the secondary positioning supplementing pattern layer is formed by recognizing the blocking condition of the nozzle at the nozzle head part, supplementing printing is realized by utilizing the offset of the printing bottom plate body, the supplementing printing precision is high, paraffin raw materials are not wasted, and the supplementing printing efficiency is greatly improved. The invention also discloses a material supplementing structure for implementing the method and a 3D printer with the structure.
The method comprises the steps of positioning the blocking point positions, printing for the first time, moving the printing bottom plate to supplement materials when the position of a nozzle is unchanged during the second printing; although the method can solve the problem of nozzle blockage, the defects of the nozzle are various, and the method cannot solve other defects of the nozzle, such as overlapped spray hole positions, missing spray holes, inclined spray direction of the spray holes and the like.
Disclosure of Invention
The invention aims to provide a printing method of automatic random disturbance of an ink gun of a 3D printer, which solves the problem that a printed product is difficult to form due to the fact that defects of individual jet orifices of the ink gun are easy to occur in the printing process of the existing 3D printer, and the defects of the jet orifices comprise jet orifice position overlapping, jet orifice missing, jet orifice blocking, jet orifice spraying direction deflection and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a printing method of automatic random disturbance of an ink gun of a 3D printer comprises the following steps:
s1, automatically taking a random integer N;
s2, the ink jet head of the 3D printer deviates by N jet hole positions relative to the printing reference point;
s3, unbinding the binding between the printing position corresponding to the printing data and the jet hole position, reversely offsetting the printing position corresponding to the printing data by the positions of N jet holes along the offset direction of the ink gun, and after offsetting, rebinding the printing position corresponding to the current layer of printing data and the jet hole position;
s4, printing the current layer;
s5, repeating the steps S1-S4, and continuing to print the next layer until the printing is finished;
the ink-jet head is an array type ink-jet head and comprises a plurality of jet holes;
in step S2, the printable ranges before and after the inkjet head shift all cover the printing range of the 3D printer design.
The ink gun is randomly deviated when each layer is printed, but the position of the actually printed pattern is still consistent with the position of the ink gun printed before deviation, the overall position of the printed product is also consistent with the overall position of the product printed when the ink gun is not deviated, and the product defects caused by the jet orifice defects are dispersed through the random deviation of the ink gun, so that the product can be normally formed; the ink jet head is randomly deviated, so that the jet holes can be randomly deviated, and the printing position corresponding to each jet hole when each layer is printed is also random; the method is suitable for the 3D printer with the array type ink jet head; the ink gun can always print and form the product in the original position by limiting the position of the ink gun which is randomly deviated, and the original position of the product is the position of the printed product when the ink gun is not deviated.
When the defective jet holes are printed, the defective jet holes always correspond to one printing position from beginning to end, and the corresponding defects are also accumulated at the same printing position; if the defect of the jet orifice is that the jet orifice is blocked and ink can not be discharged, printing blanks can be generated at the position corresponding to the printing position of the jet orifice because the jet orifice can not discharge the ink, when the printing blanks are one point or a plurality of points, the product can still be normally formed, but when the printing blanks are one surface, the product can crack and is difficult to form; if the defects of the jet holes are that the printing positions of the two jet holes are overlapped, ink is too much at the printing position, although the forming can be carried out, the formed product has obvious defects, after the jet holes are randomly deviated, the positions of the ink which is too much are dispersed and are distributed in the vertical direction corresponding to each printing position, the ink which is too much sprayed can be ignored, and the influence on the product after the forming can be ignored; if the defect of orifice has impurity in the orifice, make the injection direction of orifice appear squinting, then have two positions and appear the defect, the printing position that the orifice that has impurity corresponds can appear printing the blank, the position that the orifice that has impurity actually prints can appear out the too much defect of china ink, under the conventional printing method, the product is difficult to take shape, with the ink gun skew back, these two printing defects all can disperse, can not pile up in its vertical direction that corresponds, the defect disperses behind the different positions, the product can normally take shape.
Furthermore, when each layer is printed, the offset direction of the ink gun is along one of the X-axis direction or the Y-axis direction, the X-axis direction and the Y-axis direction are both horizontal directions, the X-axis direction and the Y-axis direction are mutually vertical, and the direction offset is randomly selected when each layer is printed by the ink gun, so that the dispersion of printing defects is facilitated, and the forming effect is better.
Further, the position information of the defective ejection orifices on the array type inkjet head is known; in step S4, when the current layer is printed, if the defective orifice position is the same as the defective orifice position when any of the previous two layers is printed, the current layer is cancelled, and step S1 is returned to avoid the phenomenon that the defects are accumulated in the same vertical direction in any of the three layers that are continuously printed, so that the printing defects are more dispersed, and the formation of the printed product is facilitated.
Further, the 3D printer includes a random rounding module, and in step S1, the random integer N is automatically selected by the random rounding module.
Further, the 3D printer includes a three-axis moving mechanism for driving the inkjet head to move in an X-axis direction, a Y-axis direction, and a Z-axis direction.
Further, the Z-axis direction is a vertical direction.
Further, in step S4, after the current layer is printed, the forming table of the 3D printer is lowered by a height of one printing layer thickness so that the height difference between the inkjet head and the forming table corresponds to the next layer to be printed.
Compared with the prior art, the invention has the beneficial effects that: the invention randomly shifts the ink gun when each layer is printed, but the position of the actually printed pattern is still consistent with the position printed by the ink gun before shifting, the whole position of the printed product is also consistent with the whole position of the product printed when the ink gun is not shifted, and the product defects caused by the jet orifice defects are dispersed by the random shifting of the ink gun, so that the product can be normally formed, thereby solving the problem that the printed product is difficult to form because the individual jet orifices of the ink gun are defective in the printing process of the existing 3D printer, the defects of the jet orifices comprise jet orifice position overlapping, jet orifice missing, jet orifice blocking, jet orifice jetting direction skew and the like, the method can be used when the jet orifices are normal, does not need to carry out hardware reconstruction, has low popularization cost and strong applicability, and can normally form the product without replacing the ink gun when the jet orifices are defective, the new ink gun is expensive, so that the cost can be effectively saved; the ink gun is complicated and time-consuming to replace, and the method can also save the time for replacing the ink gun.
Drawings
FIG. 1 is a flow chart of a printing method of automatic random disturbance of an inkjet head of a 3D printer according to the present invention;
FIG. 2 is a schematic diagram of YZ plane printing effect when the nozzle is not defective;
FIG. 3 is a schematic diagram of YZ plane printing effect printed by a conventional printing method when a nozzle hole is defective;
FIG. 4 is a schematic diagram of YZ plane printing effect printed by a printing method of automatic random disturbance of an ink jet head of a 3D printer when a nozzle has a defect;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, 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 invention.
Example 1
As shown in fig. 1, the present embodiment provides a printing method for automatic random disturbance of an inkjet head of a 3D printer, including the following steps:
s1, automatically taking a random integer N;
s2, the ink jet head of the 3D printer deviates by N jet hole positions relative to the printing reference point;
s3, unbinding the binding between the printing position corresponding to the printing data and the jet hole position, reversely offsetting the printing position corresponding to the printing data by the positions of N jet holes along the offset direction of the ink gun, and after offsetting, rebinding the printing position corresponding to the current layer of printing data and the jet hole position;
s4, printing the current layer;
s5, repeating the steps S1-S4, and continuing to print the next layer until the printing is finished;
the ink-jet head is an array type ink-jet head and comprises a plurality of jet holes;
in step S2, the printable ranges before and after the inkjet head shift all cover the printing range of the 3D printer design.
The invention randomly shifts the ink gun when each layer is printed, but the position of the actually printed pattern is still consistent with the position printed by the ink gun before shifting, the whole position of the printed product is also consistent with the whole position of the product printed when the ink gun is not shifted, and the product defects caused by the jet orifice defects are dispersed by the random shifting of the ink gun, so that the product can be normally formed, thereby solving the problem that the printed product is difficult to form because the individual jet orifices of the ink gun are defective in the printing process of the existing 3D printer, the defects of the jet orifices comprise jet orifice position overlapping, jet orifice missing, jet orifice blocking, jet orifice jetting direction skew and the like, the method can be used when the jet orifices are normal, does not need to carry out hardware reconstruction, has low popularization cost and strong applicability, and can normally form the product without replacing the ink gun when the jet orifices are defective, the new ink gun is expensive, so that the cost can be effectively saved; the ink gun is complicated and time-consuming to replace, and the method can also save the time for replacing the ink gun.
The ink jet head is randomly deviated, so that the jet holes can be randomly deviated, and the printing position corresponding to each jet hole when each layer is printed is also random; the method is suitable for the 3D printer with the array type ink jet head; the ink gun can always print and form the product in the original position by limiting the position of the ink gun which is randomly deviated, and the original position of the product is the position of the printed product when the ink gun is not deviated.
When the defective jet holes are printed, the defective jet holes always correspond to one printing position from beginning to end, and the corresponding defects are also accumulated at the same printing position; if the defect of the jet orifice is that the jet orifice is blocked and ink can not be discharged, printing blanks can be generated at the position corresponding to the printing position of the jet orifice because the jet orifice can not discharge the ink, when the printing blanks are one point or a plurality of points, the product can still be normally formed, but when the printing blanks are one surface, the product can crack and is difficult to form; if the defects of the jet holes are that the printing positions of the two jet holes are overlapped, ink is too much at the printing position, although the forming can be carried out, the formed product has obvious defects, after the jet holes are randomly deviated, the positions of the ink which is too much are dispersed and are distributed in the vertical direction corresponding to each printing position, the ink which is too much sprayed can be ignored, and the influence on the product after the forming can be ignored; if the defect of orifice has impurity in the orifice, make the injection direction of orifice appear squinting, then have two positions and appear the defect, the printing position that the orifice that has impurity corresponds can appear printing the blank, the position that the orifice that has impurity actually prints can appear out the too much defect of china ink, under the conventional printing method, the product is difficult to take shape, with the ink gun skew back, these two printing defects all can disperse, can not pile up in its vertical direction that corresponds, the defect disperses behind the different positions, the product can normally take shape.
Furthermore, when each layer is printed, the offset direction of the ink gun is along one of the X-axis direction or the Y-axis direction, the X-axis direction and the Y-axis direction are both horizontal directions, the X-axis direction and the Y-axis direction are mutually vertical, and the direction offset is randomly selected when each layer is printed by the ink gun, so that the dispersion of printing defects is facilitated, and the forming effect is better.
Further, the position information of the defective ejection orifices on the array type inkjet head is known; in step S4, when the current layer is printed, if the defective orifice position is the same as the defective orifice position when any of the previous two layers is printed, the current layer is cancelled, and step S1 is returned to avoid the phenomenon that the defects are accumulated in the same vertical direction in any of the three layers that are continuously printed, so that the printing defects are more dispersed, and the formation of the printed product is facilitated.
Further, the 3D printer includes a random rounding module, and in step S1, the random integer N is automatically selected by the random rounding module.
Further, the 3D printer includes a three-axis moving mechanism for driving the inkjet head to move in an X-axis direction, a Y-axis direction, and a Z-axis direction.
Further, the Z-axis direction is a vertical direction.
Further, in step S4, after the current layer is printed, the forming table of the 3D printer is lowered by a height of one printing layer thickness so that the height difference between the inkjet head and the forming table corresponds to the next layer to be printed.
Example 2
The difference between the automatic random disturbance printing method of the inkjet head of the 3D printer provided by the present invention and the conventional printing method (i.e. the inkjet head does not randomly disturb) is illustrated by taking a cube with a side length of 10 nozzles as an example.
When the jet holes are free from defects, the effect is the same by adopting a conventional printing method (namely the ink-jet head is not disturbed randomly) and by adopting the automatic random disturbance printing method of the ink-jet head of the 3D printer provided by the embodiment 1, as shown in FIG. 2, each point in all printing areas is printed normally and the forming is successful when viewed from a YZ plane, however, the ink-jet head often has various defects after being used for a long time.
When the 3 rd jet orifice has a defect, the conventional printing method (that is, the ink jet head does not randomly disturb) is adopted for printing, and when viewed from a YZ plane, the printing effect is as shown in fig. 3, and when a product is at a position corresponding to the 3 rd jet orifice, the forming defect is gathered in the height direction, and when the product is serious, the forming part can be cracked on the plane where the defect is gathered.
When the 3 rd nozzle has a defect, printing is performed by adopting the automatic random disturbance printing method of the ink jet head of the 3D printer provided in embodiment 1, and the printing effect is as shown in fig. 4 when viewed from the YZ plane, and because the nozzle has defects, forming defects are inevitably generated, but the defects are distributed discretely, and forming can be performed normally.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A printing method of automatic random disturbance of an ink gun of a 3D printer is characterized by comprising the following steps:
s1, automatically taking a random integer N;
s2, the ink jet head of the 3D printer deviates by N jet hole positions relative to the printing reference point;
s3, unbinding the binding between the printing position corresponding to the printing data and the jet hole position, reversely offsetting the printing position corresponding to the printing data by the positions of N jet holes along the offset direction of the ink gun, and after offsetting, rebinding the printing position corresponding to the current layer of printing data and the jet hole position;
s4, printing the current layer;
s5, repeating the steps S1-S4, and continuing to print the next layer until the printing is finished;
the ink-jet head is an array type ink-jet head and comprises a plurality of jet holes;
in step S2, the printable ranges before and after the inkjet head shift all cover the printing range of the 3D printer design.
2. The method as claimed in claim 1, wherein the inkjet head is shifted in one of an X-axis direction and a Y-axis direction during printing of each layer, the X-axis direction and the Y-axis direction are both horizontal, and the X-axis direction and the Y-axis direction are perpendicular to each other.
3. The method of claim 1, wherein the position of the defective nozzle on the array inkjet head is known; in step S4, if the defective nozzle hole position is the same as the defective nozzle hole position in printing any of the previous two layers when printing the current layer, the current layer is cancelled, and the process returns to step S1.
4. The method as claimed in claim 1, wherein the 3D printer includes a random rounding module, and the random integer N is automatically selected by the random rounding module in step S1.
5. The method according to claim 2, wherein the 3D printer comprises a three-axis moving mechanism for driving the inkjet head to move along an X-axis direction, a Y-axis direction and a Z-axis direction.
6. The method according to claim 5, wherein the Z-axis direction is vertical.
7. The printing method of the automatic random disturbance of the inkjet head of the 3D printer according to claim 1, wherein in step S4, after the current layer is printed, the forming table of the 3D printer is lowered by a height of one printing layer thickness.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283818A (en) * | 2017-07-11 | 2017-10-24 | 佛山市晗宇科技有限公司 | A kind of secondary localization method and structure for 3D printing feed supplement |
| CN112743836A (en) * | 2019-10-29 | 2021-05-04 | 共享智能铸造产业创新中心有限公司 | Pattern dislocation printing method, printer and storage medium |
| CN115157652A (en) * | 2022-06-27 | 2022-10-11 | 共享智能装备有限公司 | 3D printing method, printer and storage medium |
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2021
- 2021-08-05 CN CN202110897079.2A patent/CN113715328A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283818A (en) * | 2017-07-11 | 2017-10-24 | 佛山市晗宇科技有限公司 | A kind of secondary localization method and structure for 3D printing feed supplement |
| CN112743836A (en) * | 2019-10-29 | 2021-05-04 | 共享智能铸造产业创新中心有限公司 | Pattern dislocation printing method, printer and storage medium |
| CN115157652A (en) * | 2022-06-27 | 2022-10-11 | 共享智能装备有限公司 | 3D printing method, printer and storage medium |
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