CN107718530A - Method of printing, printing equipment and printer - Google Patents
Method of printing, printing equipment and printer Download PDFInfo
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- CN107718530A CN107718530A CN201610652901.8A CN201610652901A CN107718530A CN 107718530 A CN107718530 A CN 107718530A CN 201610652901 A CN201610652901 A CN 201610652901A CN 107718530 A CN107718530 A CN 107718530A
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- 238000000034 method Methods 0.000 title claims abstract description 147
- 230000008569 process Effects 0.000 claims description 92
- 238000012545 processing Methods 0.000 claims description 31
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- 238000007493 shaping process Methods 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 238000010146 3D printing Methods 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011960 computer-aided design Methods 0.000 description 2
- 238000007641 inkjet printing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000000110 selective laser sintering Methods 0.000 description 2
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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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- 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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Abstract
The application is related to rapid shaping technique field, more particularly to a kind of Method of printing, printing equipment and printer, and the Method of printing includes at least one printing interval, and each printing interval includes print procedure at least twice；The method includes：Obtain offset corresponding to each print procedure；In each printing interval, according to offset corresponding to current print procedure and the first displacement of printhead, the second displacement of the printhead is obtained, and, according to the second displacement of the printhead, the printhead is controlled to move, to complete print procedure.Method of printing provided herein is during control printhead movement, and control printhead enters line displacement so that the number of ink droplets in per inch be increased, and the flatness of the object finally given is improved with this.
Description
Technical Field
The present application relates to the field of rapid prototyping technologies, and in particular, to a printing method, a printing apparatus, and a printer.
Background
The basic principle of the rapid prototyping technology, also called rapid prototyping technology or additive manufacturing technology, is to fabricate a 3D object by slicing and then processing and stacking layer by layer based on a 3D (Three-dimensional) model. Currently, the rapid prototyping technology can be used to fabricate a 3D Object, and specifically, Fused Deposition (FDM) technology, Stereo Lithography (SLA) technology, Selective Laser Sintering (SLS) technology, Laminated Object Manufacturing (LOM) technology, or 3D inkjet Printing (3 DP) technology, etc. can be used. Among them, the 3D object manufactured by using the 3DP technique is one of the hot spots in recent research.
At present, the resolution of an object printed by a 3D ink-jet printer is influenced by a printing head, the resolution of the printed object is consistent with that of the printing head, when the object is printed in a layered mode, the arrangement of ink drops is consistent with that of nozzles of the printing head, namely the number of the ink drops per inch in a layer is equivalent to that of the nozzles per inch of the printing head, and the dropping positions of the corresponding ink drops among different layers are the same. The method can cause the limitation of the resolution of the printed object by the printing head, the printing heads with different resolutions are required to be used for printing the objects with different resolutions, and the problem of poor flatness due to low resolution of the objects printed by the printing head with lower resolution exists.
Disclosure of Invention
The application provides a printing method, a printing device and a printer, which are used for solving the problem that an object printed in the prior art is poor in flatness.
A first aspect of the present application provides a printing method comprising at least one printing cycle, each printing cycle comprising at least two printing passes; the method comprises the following steps:
obtaining offset corresponding to each printing process;
and in each printing period, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head, and controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
Preferably, the offset corresponding to each printing process is obtained using the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, n is the serial number of the printing positions formed by the printing head in sequence along the printing direction, and the percent represents the remainder operation.
Preferably, the first moving distance of the print head is:
wherein,d is the resolution of the target object, D is the resolution of the printing head, K is a natural number, and L is the length of the printing head.
Preferably, the first moving distance of the print head is:
S＝k*L
wherein k is a natural number and L is a length of the print head.
Preferably, the obtaining a second moving distance of the print head according to the offset corresponding to the current printing process and the first moving distance of the print head includes: and obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
Preferably, the offset corresponding to each printing process is obtained using the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
Preferably, the moving direction of the print head is consistent in each printing process.
Preferably, before obtaining the offset corresponding to each printing process, the method further includes:
layering a target object to obtain layer printing data;
at least one print cycle is determined based on the layer print data.
A second aspect of the present application provides a printing apparatus applied to at least one printing cycle, each printing cycle including at least two printing passes;
the device comprises:
the processing module is used for obtaining the offset corresponding to each printing process;
the processing module is further configured to obtain a second moving distance of the print head according to the offset corresponding to the current printing process and the first moving distance of the print head in each printing cycle;
and the driving control module is used for controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
Preferably, the processing module is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, n is the serial number of the printing positions formed by the printing head in sequence along the printing direction, and the percent represents the remainder operation.
Preferably, the processing module is specifically configured to: obtaining a first movement distance of the print head using the following equation:
wherein,d is the resolution of the target object, D is the resolution of the printing head, K is a natural number, and L is the length of the printing head.
Preferably, the processing module is specifically configured to: obtaining a first movement distance of the print head using the following equation:
S＝k*L
wherein k is a natural number and L is a length of the print head.
Preferably, the processing module is specifically configured to: and obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
Preferably, the processing module is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
Preferably, the moving direction of the print head is consistent in each printing process.
Preferably, the processing module is further configured to: the target object is layered to obtain layer print data, and at least one print cycle is determined based on the layer print data.
A third aspect of the present application provides a printer comprising a printing device and a printhead, the printing device being arranged to drive the printhead, the printing device comprising any of the printing devices described above.
The technical scheme provided by the application can achieve the following beneficial effects:
in the printing method provided by the application, in the process of controlling the printing head to move, the printing head is controlled to shift in the same printing period, so that the number of ink drops in each inch is increased, and the flatness of the finally obtained target object is improved; and meanwhile, the resolution of the target object is not influenced by the printing head, and even the printing head with low resolution can provide high-resolution printing work.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a flowchart of a printing method according to an embodiment of the present application;
fig. 2 is a flowchart of a printing method provided in the second embodiment of the present application;
fig. 3 is a flowchart of a printing method provided in the third embodiment of the present application;
fig. 4 is a flowchart of a printing method provided in the fourth embodiment of the present application;
fig. 5 is a flowchart of a printing method provided in the fifth embodiment of the present application;
FIG. 6A is a schematic diagram of the landing position of an ink drop formed by the printhead at a first time;
FIG. 6B is a schematic view of the landing position of an ink drop formed by the printhead at a second time;
FIG. 6C is a schematic view of the landing position of an ink drop formed by the printhead at a third time;
FIG. 6D is a schematic diagram of the landing position of an ink drop formed by the printhead at a fourth time;
FIG. 7A is a schematic diagram of the landing position of an ink drop formed by a print head at a first time in another embodiment;
FIG. 7B is a schematic diagram of the landing position of an ink drop formed by the printhead at a second time in another embodiment;
FIG. 7C is a schematic diagram of the landing position of an ink drop formed by the print head at a third moment in another embodiment;
FIG. 7D is a schematic diagram illustrating the landing positions of ink drops formed by the printhead at a fourth time in another embodiment;
FIG. 8A is a view after the ink droplet at the position shown in FIG. 6A has landed;
FIG. 8B is a view after the ink droplet at the position shown in FIG. 6B has landed;
FIG. 8C is a view after the ink droplet at the position shown in FIG. 6C has landed;
FIG. 8D is a view after the ink droplet at the position shown in FIG. 6D has landed;
FIG. 9A is a view after the ink droplet at the position shown in FIG. 7A has landed;
FIG. 9B is a view after the ink droplet at the position shown in FIG. 7B has landed;
FIG. 9C is a view after the ink droplet at the position shown in FIG. 7C has landed;
FIG. 9D is a view after the ink droplet at the position shown in FIG. 7D has landed;
fig. 10 is a flowchart of a printing method provided in the fifth embodiment of the present application;
fig. 11A is a schematic view of a surface structure of a target object obtained by a printing method according to an embodiment of the present application;
FIG. 11B is a schematic view of a surface structure of a target object obtained by a conventional printing method;
fig. 12 is a block diagram of a printing apparatus according to an embodiment of the present application;
FIG. 13 is a schematic structural diagram of a printer according to an embodiment of the present disclosure;
FIG. 14 is a schematic view of another embodiment of a printer;
fig. 15 is a schematic structural diagram of a printhead according to an embodiment of the present application.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example one
As shown in fig. 1, an embodiment of the present application provides a printing method, which is applicable to a 3D printing technology and includes at least one printing cycle, where each printing cycle includes at least two printing processes. The method may comprise the steps of:
and S11, obtaining the offset corresponding to each printing process.
And S12, in each printing cycle, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head.
And S13, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
The printing cycle is a cycle formed by the printing heads moving periodically in the same moving direction, and the printing process is a process formed by the printing heads completing one-time printing in the same printing cycle. Each printing process has an offset, so that the current printing process moves a certain distance relative to the previous printing process, and the offsets corresponding to the printing processes may be equal or may not be equal.
The first moving distance of the printing head refers to the distance of the printing head relative to the starting position, the first moving distance of each time the printing head sequentially moves should not be larger than the length L of the printing head, and the random moving of the printing head can be set according to specific situations.
According to the printing method provided by the embodiment of the application, in the process of controlling the printing head to move, the printing head is controlled to shift in the same printing period, so that the number of ink drops in each inch is increased, and the flatness of the finally obtained object is improved.
Example two
As shown in fig. 2, an embodiment of the present application provides a printing method, which is applicable to a 3D printing technology and includes at least one printing cycle, where each printing cycle includes at least two printing processes. The method may comprise the steps of:
s21, obtaining the offset corresponding to each printing process by using the following formula:
wherein,d is the resolution of the target object, D is the resolution of the print head, n is the serial number of the print positions sequentially formed by the print head in the printing direction,% represents the remainder operation.
And S22, in each printing cycle, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head.
And S23, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
In the process of finishing the printing content of each layer, the moving times of the printing heads form a set of N, N is more than or equal to 1 and less than or equal to N, in the process of finishing single-layer printing, the value of N is not repeatedly taken from 1 to N, the first moving distance of each time of the printing heads sequentially moving should not be more than the length L of the printing heads, and the printing heads are set according to specific conditions when moving randomly. The printing position corresponding to n is constant in the printing direction of the print head. In this embodiment, the print cycle of the print head is formed between two adjacent (n-1)% P ═ 0 (i.e., (n-1)% P derivative is 0 at two adjacent positions), and the number of times the print head moves is equal to P in one print cycle.
This embodiment determines the offset amount according to the aforementioned formula (1), which can make the number of ink droplets per inch more and more uniform, thereby improving the flatness of the printed object to a greater extent.
In another embodiment, the offset corresponding to each printing process can also be obtained by using the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
In each printing cycle, m does not repeat any value from 1 to P. The printing position corresponding to m is constant in the printing direction of the print head.
EXAMPLE III
As shown in fig. 3, an embodiment of the present invention provides a printing method, which is applicable to a 3D printing technology, and includes at least one printing cycle, each of which includes at least two printing processes. The method may comprise the steps of:
and S31, obtaining the offset corresponding to each printing process.
S32, in each printing period, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head; the first moving distance is:
wherein,d is the resolution of the target object, D is the resolution of the print head, K is a natural number, and L is the printThe length of the head.
And S33, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
The first movement distance is a distance relative to the starting position, and the number of times the print head is moved in one print cycle is equal to P.
It should be noted that K is a suitable value range, and the offset should also be suitable, the offset is not larger than the distance between adjacent orifices, and in order to prevent overlapping or partial overlapping of ink droplets in different printing processes, a certain limitation may also be imposed on the offset.
This embodiment confirms first displacement according to above-mentioned formula, and the first displacement that obtains from this is more accurate, and then guarantees in the same cycle, and each printing position of beating printer head all has higher precision to in making same cycle, the distribution of ink droplet is more even, thereby reaches the purpose that improves the roughness of printed object.
Example four
As shown in fig. 4, an embodiment of the present invention provides a printing method, which is applicable to a 3D printing technology, and includes at least one printing cycle, each of which includes at least two printing processes. The method may comprise the steps of:
and S41, obtaining the offset corresponding to each printing process.
S42, in each printing period, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head; the first moving distance is:
S＝k*L (4)
where k is a natural number and L is the length of the print head.
And S43, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
In the process of completing the printing content of each layer, the set of the number of printing cycles of the printing head is M, k is greater than or equal to 1 and less than or equal to M, and k does not take any value repeatedly from 1 to M in the process of completing the single-layer printing. I.e. k is no longer taken over during each printing process within a printing cycle.
And, within one printing cycle, the number of times the print head is moved is equal to P,d is the resolution of the target object and D is the resolution of the print head. When the next cycle starts, k starts to be re-valued.
And when k is sequentially valued in the M set, the moving directions of the printing heads are always consistent, the distance of each moving of the printing heads is L between periods, and the distance of each moving of the printing heads in each printing process in the period is the offset.
When k is randomly valued in the M set, the moving direction of the printing head is changed, the moving sequence of the printing head is changed from cycle to cycle, and the distance of each moving of the printing head is at least L; the sequence of movements of the print head is varied for each printing pass within the cycle, each movement of the print head being at least the offset.
According to the formula (3), assuming that the length L of the print head is 2inch, the resolution D of the print head is 150dpi, and the resolution D of the target object is 600dpi, thenThe first moving distance between the position of the printing head and the initial position is S ═ k × L, and since the moving distance of the printing head in the period is at least the offset, the second moving distance between the position of the printing head and the initial position is (S + (X-1) × the offset), and X is the current moving times of the printing head in the period. E.g. sequential movements in a cycle, after 1 movement, the print headThe distance from the initial position is 2inch, and k is 1 at the moment; after moving for 2 times, the distance between the printing head and the initial position is (2+ the offset) inch, and k is 1 at the moment; after 3 times of movement, the distance between the printing head and the initial position is (2+2 times the offset) inch, and k is 1; after 4 times of movement, the distance between the printing head and the initial position is (2+3 times the offset) inch, and k is 1; when the movement is performed for 5 th time, the next period starts, k starts to be re-valued, for example, k is randomly valued, k is 4 at this time, and the distance between the print head and the initial position is 8 inches.
It should be noted that the offset should be appropriate, the offset is not larger than the distance between adjacent orifices, and in order not to overlap or partially overlap ink drops of different printing processes, a certain limit may be imposed on the offset.
This embodiment can also be regarded as a special implementation manner of the third embodiment, and is applicable to this embodiment when the value of K in the third embodiment is an integer multiple of the number of times P of print head movement in the print cycle.
EXAMPLE five
As a preferred embodiment of the present invention, as shown in fig. 5, the present embodiment provides a printing method, which is applicable to a 3D printing technology, and includes at least one printing cycle, each of which includes at least two printing processes. The method may comprise the steps of:
and S51, obtaining the offset corresponding to each printing process.
And S52, in each printing cycle, obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
And S53, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
In the embodiment, the value obtained by adding the first moving distance and the offset is used as the second moving distance, and the calculation method is relatively simple and is beneficial to simplifying the control of the printing head.
Specifically, when the offset amount is the formula (1) in the second embodiment and the first moving distance is the formula (3) in the third embodiment, K is equal to n, and the second moving distance is:
wherein,d is the resolution of the target object, D is the resolution of the print head, n is the serial number of the print positions sequentially formed by the print head in the printing direction,% represents the remainder operation.
In the process of finishing the printing content of each layer, the moving times of the printing head form a set of N, N is more than or equal to 1 and less than or equal to N, and N is not repeatedly valued from 1 to N in the process of finishing the single-layer printing. The printing position corresponding to n is constant in the printing direction of the print head. In this embodiment, the print cycle of the print head is formed between two adjacent (n-1)% P ═ 0 (i.e., (n-1)% P derivative is 0 at two adjacent positions), and the number of times the print head moves is equal to P in one print cycle.
According to the formula (4), assuming that the length L of the print head is 2inch, the resolution D of the print head is 150dpi, and the resolution D of the target object is 600dpi, thenThe second moving distance between the position of the print head and the start position isE.g. 1 movement, the distance of the print head from the starting positionMove 2 timesAfter that, the distance between the printing head and the starting position isAfter 3 movements, the distance between the print head and the starting position isAfter 4 movements, the print head is at a distance from the starting positionAfter 5 movements, the print head is at a distance from the starting positionThe incremental value being the difference between the distances traveled by two adjacent print headsThe 5 th reduced moving distance isThus, (n-1)% P>At 0, the moving distance of the print head is increased by an increment ofWhen (n-1)% P is 0, the moving distance of the print head increases, and the increased moving distance is
Further, the moving direction of the print head is uniform in each printing process.
As shown in fig. 6A, 6B, 6C, and 6D, the print head provided in the present embodiment has the positions of the ink drops falling at different times, assuming t1、t2、t3、t4The moments are adjacent time of the sequence of the ink drops of the printing head and are all in the same printing period, and the printing action of the printing head is decomposed as follows:
at t1At the moment, the print head drop d1The drop position is shown in FIG. 6A, which is spaced from the starting position by a distance of
At t2At the moment, the print head drop d2The drop position is shown in FIG. 6B, which is spaced from the starting position by a distance ofCompared with St1, the print head advancesThe distance of (d);
at t3At the moment, the print head drop d3The drop position is shown in FIG. 6C and is spaced from the starting position by a distance ofCompared with St2, the print head advancesThe distance of (d);
at t4At the moment, the print head drop d4The drop position is shown in FIG. 6D, which is spaced from the starting position by a distance ofCompared with St3, the print head advancesThe distance of (c).
That is, the distance between the print head and the previous print cycle is maintained by one in P times of the same print cycleThe distance of the print head is quantitatively increased, and the print head moves at the (P +1) th timeFrom decreasing, the printing head movesThe print head completes one cycle of movement. Between (n-1)% P ═ 0, the moving distance of the print head is increased by L.
Of course, the direction of movement of the print head during each printing pass may also be random. That is, the moving direction of the print head is changed in one cycle, that is, the total number P times of the movement of the print head in one cycle may be that the print head is moved to the corresponding position P-1 times, then moved to the corresponding position P-2 times, and then moved to the corresponding position P times. To more visually illustrate the direction of movement between the plurality of print cycles. For example, in the first printing cycle, n is 5 when the print head moves for the first time, n is 7 when the print head moves for the second time, n is 1 when the print head moves for the first time in the second printing cycle, and n is 3 when the print head moves for the second time, so that the moving direction of the print head corresponding to the number of times of movement between cycles may be changed among a plurality of printing cycles.
Specifically, (n-1)% P>At 0, the moving distance of the print head isSince the moving direction of the printing head can be random, the corresponding moving direction cannot be determined, but the moving distance corresponding to the value of n is determined; when (n-1)% P is 0, the difference in the moving distance of the print head as compared with (n-2)% P is
Likewise, the direction of movement of the print head may be random from cycle to cycle. In fact, when the print head moves randomly, the distribution of the final ink drops is substantially the same as in the embodiment in which the direction of movement coincides, except for the dropping order of the ink drops during printing.
For example, as shown in fig. 7A, 7B, 7C, and 7D, the moving direction of the print head does not coincide every time, but at t5At the moment, the print head drop d5And the drop position of (a) and the ink droplet d of fig. 6A1The dropping positions of the water drops are equivalent; at t6At the moment, the print head drop d6The dropping position of (A) corresponds to t of FIG. 6C3At a time, the ink droplet d3The dropping position of (a); at t7At the moment, the print head drop d7The dropping position of (D) corresponds to t in FIG. 6D4At a time, the ink droplet d4The dropping position of (a); at t8At the moment, the print head drop d8The dropping position of (A) corresponds to t of FIG. 6B2At a time, the ink droplet d2The drop position of (a).
FIGS. 8A, 8B, 8C, 8D are views showing a state after a part of the ink droplets of FIGS. 6A, 6B, 6C, 6D have been dropped in sequence, and ink droplet D of FIG. 8A1Ink droplet d of fig. 8B corresponding to n being 12Ink droplet d of fig. 8C corresponding to n being 23Ink droplet D of fig. 8D corresponding to n being 34The corresponding n is 4.
FIGS. 9A, 9B, 9C, and 9D are ink droplet state diagrams showing a state in which a part of the ink droplets in FIGS. 7A, 7B, 7C, and 7D are randomly landed, and an ink droplet D in FIG. 9A5Ink droplet d of fig. 9B corresponding to n being 16Ink droplet d of fig. 9C corresponding to n being 37Ink droplet D of fig. 9D corresponding to n being 48The corresponding n is 2.
The number of ink drops ejected by the print head each time within a distance L of the length of the print head is the number of nozzles on the print head, and the print head moves P times after the print head has traveled a distance L, and the distribution of the positions of the ink drops within the distance L is staggered, as shown in fig. 7A, 7B, 7C, and 7D, it can be seen that the distance L is formed by a plurality of print cycles, and the distribution of the positions of the ink drops within each print cycle can be ordered or random, as shown in fig. 6A, 6B, 6C, 6D, 7A, 7B, 7C, and 7D, so that the landing position sequence of the ink drops is discontinuous.
Specifically, when the offset amount adopts formula (2) in the second embodiment and the first movement distance adopts formula (3) in the third embodiment, the second movement distance is:
wherein,d is the resolution of the target object, D is the resolution of the printing head, K is the serial number of the printing positions formed by the printing head along the printing direction in sequence, m is a natural number, m is more than or equal to 1 and less than or equal to P, and the offset is
In the process of finishing the printing content of each layer, the moving times of the printing head form a set of N, K is more than or equal to 1 and less than or equal to N, and K does not repeatedly take values from 1 to N in the process of finishing single-layer printing; in each printing cycle, m does not repeat any value from 1 to P. The printing position corresponding to m is constant in the printing direction of the print head. In this embodiment, the print cycle of the print head is formed between two adjacent (K-1)% P ═ 0 (i.e., (K-1)% P derivative is 0 at two adjacent positions), and the number of times the print head moves is equal to P in one print cycle.
According to the formula (5), assuming that the length L of the print head is 2inch, the resolution D of the print head is 150dpi, and the resolution D of the target object is 600dpi, thenThe second moving distance between the position of the print head and the start position isE.g. 1 movement, the distance of the print head from the starting positionWhen m is 1(ii) a After 2 movements, the distance between the print head and the starting position isThen m is 4; after 3 movements, the distance between the print head and the starting position isThen m is 2; after 4 movements, the print head is at a distance from the starting positionThen m is 3; at the 5 th movement, (K-1)% P is 0, m starts to be reset, and the distance between the printing head and the initial position ism is a random and non-repeating value in one printing cycle.
In this embodiment, K is sequentially valued in the set of N, and the moving directions of the print heads are always the same between periods or during each printing process within a period, and the size of the moving distance changes according to the difference in the value of m.
Similarly, K may also be a random value in the set of N, so that the moving direction of the print head may also be random; in each printing process in the printing period, the value of m is random, so in each printing period, the drop point sequence of the ink drops is different according to the value of m in each printing process. However, no matter K is a sequential value or a random value, and m is a sequential value or a random value, the distribution condition of the final ink drops is basically the same.
EXAMPLE six
As shown in fig. 10, an embodiment of the present application provides a printing method including at least one printing cycle, each printing cycle including at least two printing processes. The method may comprise the steps of:
and S61, layering the target object to obtain layer printing data.
S62, determining at least one print cycle based on the layer print data.
And S63, obtaining the offset corresponding to each printing process.
And S64, in each printing cycle, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head.
And S65, controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
Step S61 converts the target object into a data format, and may acquire information of the target object by scanning, and then convert the information contained in the target object into a data format that can be recognized by the hierarchical slicing software of the processing terminal, such as STL format, PLY format, WRL format, and so on. Specifically, the target object may contain information in units of layers. The method comprises the steps of scanning a target object, converting the scanned target object into a data format which can be identified by layering slicing software of a processing terminal through data conversion, slicing and layering through the layering software, analyzing each slicing layer to obtain layer information of each layer, and converting the layer information of each layer into layer printing data. The layer of print data may include, but is not limited to: layer structure data and layer non-structure data; layer unstructured data may include, but is not limited to: material, color, etc. of the object to be printed.
Specifically, the layer structure information and the layer non-structure information of the object to be printed can be obtained simultaneously.
As a variation, the material information of the layer non-structural information may be set according to specific needs; the color information of the layer non-structural information can be obtained by directly drawing the target object through drawing software, the common drawing software includes CAD (Computer Aided Design), pro, Solidworks, UG (unified), 3DMax and the like, the drawing software draws a basic structural model of the target object, and different changes can be made on the basis of the basic structural model. In addition, the target object may be printed by a single material or a plurality of materials, and may be a single color or a plurality of colors, and in this application, the properties of the target object, such as the material, the color information, and the like, are not limited.
And when the target object is divided into a plurality of layers, printing the layers layer by layer to form printing results, and forming the target object after the printing results of the layers are overlapped. More specifically, the one-layer printing is performed by periodic printing, that is, one layer is superimposed, and this superimposing process is an accumulation type process in which the direction of superimposition includes both superimposition in the extending direction of each layer and superimposition in the layering direction of the target object, and the target object is finally formed after all the superimposition is performed.
Specifically, a plurality of layers of printing results can be formed in a repeated layering and printing mode. The method is based on that the target object is layered and the printing work is carried out simultaneously, the specific operation mode is that layering software separates a layer from the target object to obtain layer printing data of the layer, then a printing head is controlled to print according to the layer printing data of the layer, meanwhile, the layering software carries out next layering action, and the operation is repeated repeatedly until the target object is layered and printed.
The other mode is that all layering operations are executed firstly, and then only the printing operation is repeated to form a plurality of layer printing results.
When the printing head finishes printing data of one layer, the printing head is considered to finish printing of one layer, at the moment, the printing head is moved to the initial position, and n is reset at the same time, so that the printing operation of the next layer is finished.
After the printing method provided by the embodiment of the application is adopted, a layer supporting result can be formed, the layer supporting result is formed based on the printing of the layer printing data, and the layer supporting result provides support for the printing results of two adjacent layers.
If the layer supporting result and the target object entity printing part are in the same moving direction, an offset can be applied to the moving distance of the printing head each time when printing is carried out, the layer supporting result responds to the printing work when (n-1)% P is 0, and the layer supporting result can respond to the printing work or does not respond to the printing work when (n-1)% P is greater than 0; if the layer supporting result and the target object entity printing part are not in the same moving direction, the moving distance of the printing head can be not limited every time when the layer supporting result is printed, namely, an offset can be applied to the moving distance of the printing head every time when the layer supporting result is printed, and the movement of the printing head can also not be limited, similarly, after the offset is applied, the layer supporting result responds to the printing work when (n-1)% P is 0, and can respond to the printing work when (n-1)% P >0, or can not respond to the printing work. The responsive print job here is to eject ink for the print head. Whether the layer support result responds to the printing work or not will affect the flatness of the target object, and the skilled person can adjust the layer support result according to specific requirements.
After the embodiment is adopted, the printing flatness of the target object is improved. Specifically, fig. 11A shows a surface structure of a target object obtained by the printing method provided in the embodiment of the present application, and fig. 11B shows a surface structure of a target object printed when no offset is applied to the moving distance of the print head. The surface areas of the target objects selected by the two are the same, and the number of layers is the same, and as can be seen from the comparison between the two, the structure shown in fig. 11A is more compact and dense than the structure shown in fig. 11B. Therefore, the printing method provided by the embodiment of the application can effectively improve the precision and the surface flatness of the target object.
The position of the offset can be related to the main scanning direction of the printing head, after printing in one main scanning direction of the printing head is completed, the printing head moves to perform printing in the next main scanning direction, and the offset can be applied to the movement of the printing head at this time, and if the main scanning direction is the X direction, the position of the offset is in the Y direction; if the main scanning direction is the Y direction, the position of the offset is in the X direction.
Of course, the above embodiments of the present application are all described with respect to the case of using the X axis as the main scanning direction and the movement of the print head on the Y axis as an example, for the case of using the Y axis as the main scanning direction and the movement of the print head on the X axis, adjustment may be applied according to the movement speed of the print head to adapt to the technical solution provided by the embodiments of the present application, and for the movement of the print head in the main scanning direction conversion, the principle is the same as that described in the embodiments of the present application, and details are not repeated here.
EXAMPLE seven
As shown in fig. 12, an embodiment of the present application further provides a printing apparatus, which is applied to at least one printing cycle, each printing cycle including at least two printing processes;
the device comprises:
a processing module 100, configured to obtain offsets corresponding to each printing process;
the processing module 100 is further configured to obtain, in each printing cycle, a second moving distance of the print head according to the offset corresponding to the current printing process and the first moving distance of the print head;
and the driving control module 200 is configured to control the print head to move according to the second moving distance of the print head, so as to complete the printing process.
Further, in an embodiment, the processing module 100 is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
wherein,d is the resolution of the target object, D is the resolution of the print head, n is the serial number of the print positions sequentially formed by the print head in the printing direction,% represents the remainder operation.
In another embodiment, the processing module 100 is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
Further, in an embodiment, the processing module 100 is specifically configured to: the first movement distance of the print head is obtained using the following equation:
wherein,d is the resolution of the target object, D is the resolution of the print head, K is a natural number, and L is the length of the print head.
In another embodiment, the processing module 100 is specifically configured to: the first movement distance of the print head is obtained using the following equation:
S＝k*L
where k is a natural number and L is the length of the print head.
In order to improve the printing precision, the processing module 100 is specifically configured to: and obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
In one embodiment, m is equal to n is equal to K, and the second moving distance is equal to K
In another embodiment, K ≠ m, and the second travel distance is
In order to facilitate control of the print head, the direction of movement of the print head is consistent during each printing process.
Optionally, the processing module 100 is configured to layer the target object to obtain layer printing data, and determine at least one printing cycle according to the layer printing data. The layering module may contain layering software.
Example eight
An embodiment of the present application further provides a printer, where the structure of the printer is as shown in fig. 13 and 14, and the printer includes: printing device, material container 4, printer head 5, guide rail 6, supporting platform 7, elevating platform 8, first LED lamp 9a and second LED lamp 9 b. The printing apparatus includes a processing module 2 and a drive control module 3. The structure of the print head 5 can be referred to fig. 15.
In a preferred embodiment, the processing module 2 performs layering processing on the target object 1 to obtain layer print data, and transmits the layer print data to the drive control module 3. The drive control module 3 controls the print head 5 according to the layer print data, and applies an offset to the movement of the print head. The print head 5 performs a printing operation in accordance with an instruction sent from the drive control module 3.
The material container 4 comprises a solid material container 4a and a support material container 4b, the print head 5 comprises a solid material channel 5a and a support material channel 5b, the solid material container 4a provides the target object with printing material through the solid material channel 5a, and the support material container 4b provides the layer support result with printing material through the support material channel 5 b.
Further, the functions of the processing module 2 and the driving control module 3 may be implemented by hardware, software executed by a processor, or a combination of the two. Specifically, if the software implementation is realized, a pre-program can be burned into the processor, or the software can be installed into a preset system; if the hardware implementation is realized, the corresponding function can be realized by fixing through a Field-Programmable Gate Array (FPGA).
The software may be stored in a RAM (random access Memory), a flash Memory, a ROM (Read-Only Memory), an EPROM (Erasable Programmable Read-Only Memory), a hard disk, or any other form of storage medium known in the art. By coupling the storage medium to the processor, the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor, or the processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC).
The hardware may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or a combination thereof, capable of performing the specified functions. As a variation, the implementation may also be through a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP communications network, or the like.
Further, as shown in fig. 14, a first LED lamp 9a and a second LED lamp 9b are installed on two sides of the print head 5, and the print head 5, the first LED lamp 9a and the second LED lamp 9b are all installed on the guide rail 6, during the process of ink-jet printing layer by the print head, the first LED lamp 9a and the second LED lamp 9b can work simultaneously or alternatively, and finally, the purpose is to cure the material of each layer to form a layer of the target object, and in practical application, multiple layers can be printed for one-time curing.
The lifting platform 8 descends by a certain height after finishing one layer of printing result or finishing a plurality of layers of printing results, and then continuously finishes printing of the rest layers of printing results, and finally the target object 1 is formed on the supporting platform 7.
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 (17)
1. A printing method comprising at least one printing cycle, each printing cycle comprising at least two printing passes; the method comprises the following steps:
obtaining offset corresponding to each printing process;
and in each printing period, obtaining a second moving distance of the printing head according to the offset corresponding to the current printing process and the first moving distance of the printing head, and controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
2. The printing method according to claim 1, wherein the offset amount corresponding to each printing process is obtained using the following formula:
<mfrac> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> <mi>%</mi> <mi>P</mi> </mrow> <mrow> <mi>P</mi> <mo>*</mo> <mi>d</mi> </mrow> </mfrac>
wherein,d is the resolution of the target object, D is the resolution of the printing head, n is the serial number of the printing positions formed by the printing head in sequence along the printing direction, and the percent represents the remainder operation.
3. The printing method of claim 1, wherein the first distance of movement of the printhead is:
<mrow> <mi>S</mi> <mo>=</mo> <mi>K</mi> <mo>*</mo> <mfrac> <mi>L</mi> <mi>P</mi> </mfrac> </mrow>
wherein,d is the resolution of the target object, D is the resolution of the printing head, K is a natural number, and L is the length of the printing head.
4. The printing method of claim 1, wherein the first distance of movement of the printhead is:
S＝k*L
wherein k is a natural number and L is a length of the print head.
5. The printing method according to claim 1, wherein the obtaining the second moving distance of the print head according to the offset corresponding to the current printing process and the first moving distance of the print head comprises: and obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
6. The printing method according to claim 1, wherein the offset amount corresponding to each printing process is obtained using the following formula:
<mfrac> <mrow> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> <mrow> <mi>P</mi> <mo>*</mo> <mi>d</mi> </mrow> </mfrac>
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
7. The printing method of claim 1, wherein the direction of movement of the print head is uniform during each of the printing processes.
8. The printing method according to any one of claims 1-7, wherein before obtaining the offset corresponding to each printing process, the method further comprises:
layering a target object to obtain layer printing data;
at least one print cycle is determined based on the layer print data.
9. A printing apparatus, characterised by being applied to at least one print cycle, each print cycle comprising at least two printing passes;
the device comprises:
the processing module is used for obtaining the offset corresponding to each printing process;
the processing module is further configured to obtain a second moving distance of the print head according to the offset corresponding to the current printing process and the first moving distance of the print head in each printing cycle;
and the driving control module is used for controlling the printing head to move according to the second moving distance of the printing head so as to finish the printing process.
10. The printing apparatus of claim 9, wherein the processing module is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
<mfrac> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> <mi>%</mi> <mi>P</mi> </mrow> <mrow> <mi>P</mi> <mo>*</mo> <mi>d</mi> </mrow> </mfrac>
wherein,d is the resolution of the target object, D is the resolution of the printing head, n is the serial number of the printing positions formed by the printing head in sequence along the printing direction, and the percent represents the remainder operation.
11. The printing apparatus of claim 9, wherein the processing module is specifically configured to: obtaining a first movement distance of the print head using the following equation:
<mrow> <mi>S</mi> <mo>=</mo> <mi>K</mi> <mo>*</mo> <mfrac> <mi>L</mi> <mi>P</mi> </mfrac> </mrow>
wherein,d is the resolution of the target object, D is the resolution of the printing head, K is a natural number, and L is the length of the printing head.
12. The printing apparatus of claim 9, wherein the processing module is specifically configured to: obtaining a first movement distance of the print head using the following equation:
S＝k*L
wherein k is a natural number and L is a length of the print head.
13. The printing apparatus of claim 9, wherein the processing module is specifically configured to: and obtaining the sum of the offset corresponding to the current printing process and the first moving distance of the printing head as the second moving distance of the printing head.
14. The printing apparatus of claim 9, wherein the processing module is specifically configured to: the offset corresponding to each printing process is obtained by the following formula:
<mfrac> <mrow> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> <mrow> <mi>P</mi> <mo>*</mo> <mi>d</mi> </mrow> </mfrac>
wherein,d is the resolution of the target object, D is the resolution of the printing head, m is a natural number, and m is more than or equal to 1 and less than or equal to P.
15. The printing apparatus of claim 9, wherein the direction of movement of said print head is uniform during each of said printing processes.
16. The printing apparatus of any of claims 9-15, wherein the processing module is further configured to: the target object is layered to obtain layer print data, and at least one print cycle is determined based on the layer print data.
17. A printer comprising a printing device and a print head, the printing device being adapted to drive the print head, characterized in that the printing device comprises a printing device according to any of claims 9-16.
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