CN111319255A - Processing method for 3D printing sharp track - Google Patents
Processing method for 3D printing sharp track Download PDFInfo
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- CN111319255A CN111319255A CN202010152021.0A CN202010152021A CN111319255A CN 111319255 A CN111319255 A CN 111319255A CN 202010152021 A CN202010152021 A CN 202010152021A CN 111319255 A CN111319255 A CN 111319255A
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- printing
- motion track
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- track line
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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
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
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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
- 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
-
- 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
Abstract
The invention discloses a processing method for 3D printing of sharp tracks, wherein motion track lines of each layer of 3D printing are arrays of multiple straight lines, the motion track lines are analyzed, and judgment of sharp points of the motion tracks is carried out; breaking the motion track line at a sharp point to obtain two multiple straight lines of the front and back motion track lines; the two multiple straight lines are respectively extended by a section of straight line at a sharp point; continuously generating new curves from the extended front and rear motion track lines; converting the curve into multiple straight lines as a middle transition motion track line; the 3D printing motion trajectory is replanned as follows: front motion track line → middle transition motion track line → rear motion track line, and the printing head does not discharge on the middle transition motion track line. According to the invention, by optimizing the printing motion path, the conditions of deceleration, vibration and the like of the motion device in the actual motion process are reduced, the corner material accumulation phenomenon is avoided, and the printing quality of the 3D printing component is effectively improved.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a processing method for 3D printing of a sharp track.
Background
3D printing is one of the rapid prototyping technologies, which is a technology for constructing an object by using a bondable material such as powdered metal or plastic based on a digital model file and by printing layer by layer.
The design process of 3D printing is as follows: for a component to be printed, modeling is performed through computer modeling software, and then the built three-dimensional model is divided into sections layer by layer, namely slices, so as to obtain a printing program, and the printer is guided to print layer by layer.
Specifically, before printing by a large FDM (fused deposition rapid prototyping) machine, a member to be printed needs to be sliced to obtain a printing program. When printing, the motion device moves according to the running track in the printing program, and in the motion process, the spray head discharges materials, so that the 3D printing fused deposition process is realized, and finally, the 3D printing component is obtained.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
aiming at the running track program that a large machine tool has sharp points, the conditions of speed reduction, vibration and the like can occur at the sharp points of the running track of a moving device, so that the 3D printing fusion deposition process can be influenced, the corner material accumulation phenomenon is caused, and the printing quality of a 3D printing component is finally influenced.
In the prior art, a chamfering strategy is sometimes adopted, namely, a sharp point is chamfered into an arc angle, which can relieve the above problem of the 3D printing fused deposition process to some extent, but the original motion track is damaged, and the printed components are not accurate.
Disclosure of Invention
The embodiment of the application provides a 3D prints processing method of sharp-pointed orbit, the problem of operation orbit procedure to large-scale lathe has the sharp-pointed point among the prior art is solved, the situation such as deceleration can appear at the sharp-pointed point department of movement path to the telecontrol equipment, vibrations, and then influence 3D and print the fused deposition process, lead to the long-pending material phenomenon of corner, finally influence the technical problem of the product quality that 3D printed the component, through optimizing the printing motion route, the situation such as the deceleration of telecontrol equipment in the actual motion process, vibrations have been reduced, the long-pending material phenomenon of corner has been avoided, the printing quality that 3D printed the component has effectively been improved.
The embodiment of the application provides a processing method for 3D printing of a sharp track, which comprises the following steps:
step S1: 3D printing an array of multiple straight lines on the motion track line of each layer, analyzing the motion track line, and judging the sharp point of the motion track;
step S2: breaking the motion track line at the sharp point to obtain a front motion track line and a rear motion track line which are two multiple straight lines;
step S3: the two multiple straight lines of the front movement track line and the rear movement track line respectively extend for a section of straight line at the sharp point;
step S4: continuously generating a new nurbs curve for the lengthened front motion track line and the lengthened rear motion track line by using a nurbs curvature;
step S5: converting the new nurbs curve into multiple straight lines as a middle transition motion track line;
step S6: the 3D printing motion trajectory is replanned as follows: front motion track line → middle transition motion track line → rear motion track line, and the printing head does not discharge on the middle transition motion track line.
Preferably, in step S1, the specific step of determining the motion trajectory sharp point is:
and (3) picking up each point on the multiple straight lines, sequentially judging the angle formed by connecting lines of the three adjacent points along the sequence from the starting point to the end point of the motion track, and if the angle formed by connecting the three points is smaller than a set angle threshold, considering the middle point of the three points as a sharp point of the motion track.
More preferably, the set angle threshold is 130 ° to 140 °.
Preferably, in step S3: the length of the extended straight line is not less than 2 times of the line width of the printer nozzle.
Preferably, in step S5, the new nurbs curve is converted into multiple straight lines according to a set maximum deviation angle.
More preferably, the set maximum deviation angle is 0.05 to 0.15.
Preferably, in step S6, the specific operation method during printing is as follows:
A. the moving device moves along the front movement track line, and the printer nozzle continuously discharges materials;
B. after the movement device reaches the end point of the front movement track line, the printer nozzle is pumped back, and discharging is stopped;
C. the moving device moves along the middle transition motion track line, and the printer nozzle does not discharge materials;
D. after the motion device reaches the end point of the middle transition motion track line, namely the starting point of the rear motion track line, the printer spray head finishes pumping back and starts discharging;
E. the moving device moves along the rear movement track line, and the printer nozzle continuously discharges materials.
Preferably, the method further comprises the step S7: the operations of steps S2 to S6 are performed for each sharp point on the motion trajectory of each layer.
Preferably, the method further comprises the step S8: and outputting the optimized motion trail, and forming a Gcode file which can be executed by a three-dimensional printer and is used for 3D printing.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) an intermediate transition curve is formed at a sharp point of a movement track line, and a printer nozzle does not discharge on the intermediate transition curve, so that an optimized smooth movement track is obtained, and the technical problems that in the prior art, aiming at a movement track program with a sharp point of a large machine tool, a movement device has the conditions of speed reduction, vibration and the like at the sharp point of the movement track, the 3D printing melting deposition process is influenced, the corner material accumulation phenomenon is caused, and the product quality of a 3D printing component is influenced finally are solved; the conditions of speed reduction, vibration and the like of the movement device in the actual movement process are reduced, the phenomenon of corner material accumulation is avoided, and the printing quality of the 3D printing component is effectively improved.
(2) By using the optimized smooth motion track and matching with the pumping-back strategy of the high-performance printing nozzle, the original printing path can not be damaged, and the technical problem that the original motion track is damaged by a chamfering strategy in the prior art is solved; because the printer nozzle does not discharge on the middle transition curve, the optimized smooth motion track is still accurate, and the printing quality of the 3D printing component can be obviously improved.
Drawings
Fig. 1 is a flowchart of a processing method for 3D printing a sharp track provided in an embodiment of the present application;
fig. 2 is a schematic diagram of determining a sharp point for each motion trajectory line;
FIG. 3 is a schematic view of a motion trajectory line broken at a sharp point;
FIG. 4 is a schematic diagram of two broken multiple straight lines respectively extended by a straight line at a sharp point;
FIG. 5 is a schematic diagram of a consecutive generation of new nurbs curves using a nurbs curvature for two multiple straight lines after breaking;
fig. 6 is a diagram illustrating the conversion into multiple straight lines according to the set maximum deviation angle for the new nurbs curve.
Detailed Description
The embodiment of the application provides a 3D prints processing method of sharp-pointed orbit, the problem of operation orbit procedure to large-scale lathe has the sharp-pointed point among the prior art is solved, the situation such as deceleration can appear at the sharp-pointed point department of movement path to the telecontrol equipment, vibrations, and then influence 3D and print the fused deposition process, lead to the long-pending material phenomenon of corner, finally influence the technical problem of the product quality that 3D printed the component, through optimizing the printing motion route, the situation such as the deceleration of telecontrol equipment in the actual motion process, vibrations have been reduced, the long-pending material phenomenon of corner has been avoided, the printing quality that 3D printed the component has effectively been improved.
In order to solve the problem of crosstalk, the technical scheme in the embodiment of the present application has the following general idea:
before the large FDM machine tool is used for printing, a component to be printed needs to be sliced, and a printing program is obtained. During the slicing process, the obtained printing program is essentially a motion track line formed by connecting a great number of points. During the slicing process, the motion track line of each layer is an array of multiple straight lines.
And judging a sharp point for each multiple straight line. The multiple straight lines are broken at sharp points to obtain two multiple straight lines. And respectively extending a section of straight line at a sharp point by two multiple straight lines, continuously generating a new nurbs curve by using a nurbs curvature, and converting the nurbs curve into the multiple straight lines according to a set maximum deviation angle to be used as a middle transition track. And the printing head does not discharge materials in the middle transition track.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Fig. 1 is a flowchart of a processing method for 3D printing a sharp track provided in this embodiment, where the processing method for 3D printing a sharp track includes the following steps:
step S1: and 3D printing an array of multiple straight lines on the motion track line of each layer, analyzing the motion track line, and judging the sharp point of the motion track.
The method specifically comprises the following steps:
as shown in FIG. 2, during the slicing process, the motion trajectory of each layer is an array of multiple straight lines, denoted as PL [ ].
And judging a sharp point of each motion track line, and specifically comprising the following steps:
picking up each point on the multiple straight lines PL, sequentially judging the angle formed by the connecting lines of the three adjacent points along the sequence from the starting point to the end point of the motion track line, and if the angle formed by the connecting lines of the three points is smaller than a set angle threshold, considering the middle point of the three points as a sharp point of the motion track, and forming an array P [ ] for all the sharp points.
As a preferred embodiment, the set angle threshold is 130 ° to 140 °.
For example, in fig. 2, assuming that the set angle threshold is 135 ° and the angle ∠ OPQ formed by connecting O, P, Q three points is smaller than 135 °, the middle point P of the O, P, Q three points is considered to be a sharp point of the motion trajectory.
Step S2: and breaking the motion track line at the sharp point to obtain two multiple straight lines of the front motion track line and the rear motion track line.
The method specifically comprises the following steps:
as shown in fig. 3, the multiple straight lines PL are broken using sharp points P, resulting in two multiple straight lines PL ① and PL ②.
Step S3: two multiple straight lines of the front movement track line and the rear movement track line are respectively extended by a section of straight line at a sharp point.
The method specifically comprises the following steps:
as shown in FIG. 4, the multiple straight lines PL ① extend over a straight line PP at the sharp point P1Multiple straight lines PL ② extending over a straight line PP at a sharp point P2。
Extended distance PP1、PP2D, which is set to be at least 2 times larger than the line width.
Step S4: and continuously generating a new nurbs curve by using the nurbs curvature for two multiple straight lines of the extended front motion track line and the extended rear motion track line.
The method specifically comprises the following steps:
as shown in fig. 5, new nurbs curves NC are continuously generated by reusing the nurbs curvature for the multiple straight lines PL ① and PL ②.
Step S5: and converting the new nurbs curve into multiple straight lines according to a set maximum deviation angle, and taking the multiple straight lines as a middle transition motion track line.
In a preferred embodiment, the set maximum deviation angle is 0.05 to 0.15.
The method specifically comprises the following steps:
as shown in fig. 6, assuming that the set maximum deviation angle is 0.1, the new nurbs curve NC is converted into multiple straight-line PLCs according to the maximum deviation angle of 0.1, and the multiple straight-line PLCs are taken as intermediate transition motion trajectory lines.
Step S6: the 3D printing motion trajectory is replanned as follows: front motion track line → middle transition motion track line → rear motion track line, and the printing head does not discharge on the middle transition motion track line.
The method specifically comprises the following steps:
as shown in FIG. 6, the 3D printing motion trajectory is re-planned to be multiple straight line PL ① → multiple straight line PLC → multiple straight line PL ②, and the print head is not discharged on the multiple straight line PLC.
The specific operation method during printing is as follows:
A. the moving device moves along multiple straight lines PL ①, and the printer nozzle continuously discharges materials;
B. after the moving device reaches the end point P of the multiple straight lines PL ① (passes through the point P for the first time), the printer nozzle is drawn back, and discharging is stopped;
C. the moving device moves along the multiple linear PLC, and the printer nozzle does not discharge materials;
D. after the moving device reaches the end point of the multiple straight line PLC, namely the starting point of the multiple straight line PL ② (passes through the point P for the second time), the printer nozzle finishes the drawing back and starts to discharge;
E. the moving device moves along multiple straight lines PL ②, and the printer head continues to discharge.
Step S7: the operations of steps S2 to S6 are performed for each sharp point on the motion trajectory of each layer.
The method specifically comprises the following steps:
for each point P in the array P [ ], the operations of steps S2-S6 are performed.
This is done for each PL in the multiple linear PL array [ ] of the layer motion trajectory.
The above-described operation is performed for the motion trajectory of each layer of the 3D printing.
Step S8: and outputting the optimized motion trail, and forming a Gcode file which can be executed by a three-dimensional printer and is used for 3D printing.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
(1) an intermediate transition curve is formed at a sharp point of a movement track line, and a printer nozzle does not discharge on the intermediate transition curve, so that an optimized smooth movement track is obtained, and the technical problems that in the prior art, aiming at a movement track program with a sharp point of a large machine tool, a movement device has the conditions of speed reduction, vibration and the like at the sharp point of the movement track, the 3D printing melting deposition process is influenced, the corner material accumulation phenomenon is caused, and the product quality of a 3D printing component is influenced finally are solved; the conditions of speed reduction, vibration and the like of the movement device in the actual movement process are reduced, the phenomenon of corner material accumulation is avoided, and the printing quality of the 3D printing component is effectively improved.
(2) By using the optimized smooth motion track and matching with the pumping-back strategy of the high-performance printing nozzle, the original printing path can not be damaged, and the technical problem that the original motion track is damaged by a chamfering strategy in the prior art is solved; because the printer nozzle does not discharge on the middle transition curve, the optimized smooth motion track is still accurate, and the printing quality of the 3D printing component can be obviously improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A processing method for 3D printing of sharp tracks is characterized by comprising the following steps:
step S1: 3D printing an array of multiple straight lines on the motion track line of each layer, analyzing the motion track line, and judging the sharp point of the motion track;
step S2: breaking the motion track line at the sharp point to obtain a front motion track line and a rear motion track line which are two multiple straight lines;
step S3: the two multiple straight lines of the front movement track line and the rear movement track line respectively extend for a section of straight line at the sharp point;
step S4: continuously generating a new nurbs curve for the lengthened front motion track line and the lengthened rear motion track line by using a nurbs curvature;
step S5: converting the new nurbs curve into multiple straight lines as a middle transition motion track line;
step S6: the 3D printing motion trajectory is replanned as follows: front motion track line → middle transition motion track line → rear motion track line, and the printing head does not discharge on the middle transition motion track line.
2. The processing method for 3D printing of the sharp track according to claim 1, wherein in the step S1, the specific steps for determining the sharp point of the motion track are as follows:
and (3) picking up each point on the multiple straight lines, sequentially judging the angle formed by connecting lines of the three adjacent points along the sequence from the starting point to the end point of the motion track, and if the angle formed by connecting the three points is smaller than a set angle threshold, considering the middle point of the three points as a sharp point of the motion track.
3. The process for 3D printing sharp tracks according to claim 2, characterized in that said set angular threshold is comprised between 130 ° and 140 °.
4. The processing method for 3D printing of sharp tracks according to claim 1, wherein in step S3: the length of the extended straight line is not less than 2 times of the line width of the printer nozzle.
5. The processing method for 3D printing of the sharp track according to claim 1, wherein in the step S5, the new nurbs curve is converted into multiple straight lines according to the set maximum deviation angle.
6. The processing method for 3D printing of the sharp track according to claim 5, wherein the set maximum deviation angle is 0.05-0.15.
7. The processing method for 3D printing of the sharp track according to claim 1, wherein in the step S6, the specific operation method during printing is as follows:
A. the moving device moves along the front movement track line, and the printer nozzle continuously discharges materials;
B. after the movement device reaches the end point of the front movement track line, the printer nozzle is pumped back, and discharging is stopped;
C. the moving device moves along the middle transition motion track line, and the printer nozzle does not discharge materials;
D. after the motion device reaches the end point of the middle transition motion track line, namely the starting point of the rear motion track line, the printer spray head finishes pumping back and starts discharging;
E. the moving device moves along the rear movement track line, and the printer nozzle continuously discharges materials.
8. The processing method for 3D printing of sharp tracks according to claim 1, further comprising step S7: and performing the operations of the steps S2-S6 for each sharp point on the motion trail of each layer.
9. The processing method for 3D printing of sharp tracks according to claim 1, further comprising step S8: and outputting the optimized motion trail, and forming a Gcode file which can be executed by a three-dimensional printer and is used for 3D printing.
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| CN202010152021.0A CN111319255A (en) | 2020-03-06 | 2020-03-06 | Processing method for 3D printing sharp track |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112270023A (en) * | 2020-09-18 | 2021-01-26 | 同济大学 | Slicing method for building 3D printing with extrusion head steering taken into consideration |
| CN112548116A (en) * | 2020-11-30 | 2021-03-26 | 中国商用飞机有限责任公司 | Printing path optimization method using fuse 3D printing technology and 3D printing method |
| CN113085188A (en) * | 2021-04-01 | 2021-07-09 | 上海酷鹰机器人科技有限公司 | Method and device for acquiring printing track line |
| CN117507367A (en) * | 2024-01-08 | 2024-02-06 | 北京阿迈特医疗器械有限公司 | Support printing method and device with mark points |
-
2020
- 2020-03-06 CN CN202010152021.0A patent/CN111319255A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112270023A (en) * | 2020-09-18 | 2021-01-26 | 同济大学 | Slicing method for building 3D printing with extrusion head steering taken into consideration |
| CN112270023B (en) * | 2020-09-18 | 2022-08-30 | 同济大学 | Slicing method for building 3D printing with extrusion head steering taken into consideration |
| CN112548116A (en) * | 2020-11-30 | 2021-03-26 | 中国商用飞机有限责任公司 | Printing path optimization method using fuse 3D printing technology and 3D printing method |
| CN113085188A (en) * | 2021-04-01 | 2021-07-09 | 上海酷鹰机器人科技有限公司 | Method and device for acquiring printing track line |
| CN117507367A (en) * | 2024-01-08 | 2024-02-06 | 北京阿迈特医疗器械有限公司 | Support printing method and device with mark points |
| CN117507367B (en) * | 2024-01-08 | 2024-04-05 | 北京阿迈特医疗器械有限公司 | Support printing method and device with mark points |
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