CN108422672B - 3D printing scanning method and system and 3D printer - Google Patents
3D printing scanning method and system and 3D printer Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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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
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
- B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
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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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
The invention relates to the technical field of 3D printing. An embodiment of the invention provides a 3D printing and scanning method, a system and a 3D printer, wherein the method comprises the following steps: parsing a model file to be 3D printed to determine connected solid sections about a printed object; analyzing a plurality of boundary elements contained in the solid section; performing a boundary element scan path generation step comprising: determining a Thiessen polygon corresponding to the boundary element; generating a scanning path segment for the boundary element according to the maximum offset distance of the boundary element to the Thiessen polygon and a predetermined offset threshold value. Therefore, based on the characteristic that the distance from all points in the closed polygonal area to the corresponding boundary element is smaller than the distance from all points in the closed polygonal area to other boundary elements, the scanning path section corresponding to the Thiessen polygon is drawn up, so that even if the contour offset distance exceeds half of the wall thickness of the thin wall, the printing precision can still be effectively ensured.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a 3D printing scanning method and system and a 3D printer.
Background
The current laser 3D printing and scanning method is generally divided into linear filling, circular filling and spiral filling, as shown in fig. 1A to 1C, which are schematic diagrams of effects of workpieces generated by 3D printing and scanning paths of linear filling, circular filling and spiral filling, respectively. As can be seen visually from the diagrams of fig. 1A and 1B, when the 3D printing is performed by using the two path generation methods of linear filling and annular filling, a more obvious step effect exists, and when an included angle formed by a part boundary profile and a scanning direction is smaller, the step effect is more obvious, which seriously affects the forming accuracy of the 3D printing; fig. 1C adopts a method of shifting the boundary profile to generate, so that the step effect is avoided in principle, but when generating a path for a workpiece (e.g. a thin-walled workpiece) with a high requirement on the accuracy of the edge portion, especially when 3D printing single-pass cladding width is equivalent to the minimum wall thickness, the profile shifting distance already exceeds 1/2 of the wall thickness at the thin wall, so that a corresponding scanning path cannot be generated at a long and narrow thin-walled structure (as shown in fig. 1D). For such a variable curvature thin-wall structure, a scanning path can be generated by the first two filling modes, but the precision is reduced due to a step effect, the obtained scanning path is relatively trivial and short, the surface appearance is deteriorated during laser 3D printing due to the sudden change of the acceleration in the starting and stopping stages of the path, and even if the layer profile is cut by manual partitioning, the situation cannot be avoided.
Therefore, for such workpieces with thin-wall structures, the existing 3D scanning path generation method is difficult to effectively ensure the printing precision, and it is a technical problem to be urgently solved to develop a 3D printing and scanning technology that can still effectively ensure the printing precision when being used for workpieces with thin-wall structures.
Disclosure of Invention
The embodiment of the invention aims to provide a 3D printing and scanning method, a system, a 3D printer and a machine readable storage medium, so as to improve the printing precision of a 3D printed workpiece with a thin-wall structure.
In order to achieve the above object, an embodiment of the present invention provides a 3D printing and scanning method, including: parsing a model file to be 3D printed to determine connected solid sections about a printed object; analyzing a plurality of boundary elements contained in the solid section; performing a boundary element scan path generation step comprising: determining a Thiessen polygon corresponding to the boundary element; generating a scanning path segment for the boundary element according to the maximum offset distance of the boundary element to the Thiessen polygon and a predetermined offset threshold value.
Another aspect of an embodiment of the present invention provides a 3D printing and scanning system, including: the solid section analyzing unit is used for analyzing the model file to be 3D printed so as to determine the communicated solid sections of the printing objects; a boundary element analyzing unit, configured to analyze a plurality of boundary elements included in the entity cross section; a boundary element scanning path segment generating unit comprising: the Thiessen polygon generation module is used for determining a Thiessen polygon corresponding to the boundary element; a boundary element scanning path segment generating module, configured to generate a scanning path segment for the boundary element according to a maximum offset distance from the boundary element to the Thiessen polygon and a predetermined offset threshold.
The embodiment of the invention further provides a 3D printer, which comprises the 3D printing and scanning system.
The invention further provides a machine-readable storage medium, which stores instructions for controlling a machine to execute the 3D printing and scanning method described above.
Through the technical scheme, the Thiessen polygons corresponding to the boundary elements of the solid cross section are determined, and the scanning path section aiming at the boundary elements is generated according to the maximum offset distance and the preset offset distance from the boundary elements to the Thiessen polygons corresponding to the boundary elements. Therefore, based on the characteristic that the Thiessen polygon has the characteristic that the distances from all points in the closed polygon region to the corresponding boundary elements are smaller than the distances from all points to other boundary elements, the scanning path section corresponding to the Thiessen polygon is drawn up, so that even if the contour offset distance exceeds half of the wall thickness of the thin wall, the printing precision can still be effectively ensured.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1A is a schematic illustration of the effect of a workpiece produced by a straight-line filled 3D printing scan path;
FIG. 1B is a schematic illustration of the effect of a workpiece produced by a 3D printing scan path of a ring fill;
FIG. 1C is a schematic diagram of the effect of a workpiece produced by a spiral filled 3D printing scan path;
FIG. 1D is a schematic diagram illustrating the effect of applying the scan path generation method shown in FIG. 1C to a thin-walled part;
FIG. 2 is a flow chart of a 3D printing and scanning method according to an embodiment of the invention;
FIG. 3 is an example of a closed contour obtained for a slice of an STL model;
FIG. 4A is an effect diagram of a solid cross-section after outline grouping and element initialization;
FIG. 4B is an example of a bisector of a single boundary element;
FIG. 4C is an example of a Thiessen polygon of a single boundary element;
FIG. 4D is an example of an element Thiessen polygon for all boundary elements;
FIG. 4E is a scan path segment generated for a solid cross-section at a single offset distance;
FIG. 4F is a scan path segment generated for a solid cross section at all offsets;
FIG. 5 is a flowchart of a thin-walled workpiece 3D printing path generation method according to an embodiment of the invention;
FIG. 6 is a schematic diagram illustrating the effect of a workpiece generated by applying the 3D printing scan path method according to the embodiment of the present invention;
fig. 7 is a block diagram of a 3D printing and scanning system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 2, a 3D printing and scanning method according to an embodiment of the present invention includes:
and S21, acquiring a model file to be 3D printed.
Specifically, the model file to be 3D printed may be, for example, an STL type file, but may also be other types of 3D printed model files, and the document is not limited herein. In addition, the acquisition mode may be to import a corresponding model file into the 3D printer.
And S22, analyzing the 3D printed model file to determine connected entity sections of the printing object.
Specifically, the determination process of the solid cross section may determine all contours included for even number of times as the outer contours of the solid cross section and all contours included for odd number of times as the inner contours of the solid cross section by counting the included times among the contours in the model file to be 3D printed.
As shown in fig. 3, the closed contours obtained by slicing the STL model are grouped to obtain connected solid cross sections (because the closed contours formed by straight lines are obtained by slicing the STL file), specifically, the included times among the contours may be counted, all contours included by even number (N) are outer contours of the solid cross sections, and all contours included by the outer contours and included by N-1 times are inner contours of the corresponding solid cross sections, so that all solid cross sections after layering can be determined. As shown in fig. 3, the outline 3 and the outline 4 correspond to each other and are respectively the outer outline and the inner outline of the outermost ring structure of the solid cross section of the model; the profile 5 and the profile 6 are an outer profile and an inner profile of the inner ring structure, in which the number of times the profile 3 is contained is 0, the profile 4 is contained 1 time by the profile 3, the profile 5 is contained 1 time by the profile 3 and the profile 4, respectively (which are contained 2 times in total), and the profile 6 is contained 1 time by the profile 3, the profile 4, and the profile 5, respectively (which are contained 3 times in total), whereby the number of times each profile is contained and parity with respect to the number of times can be counted.
And S23, analyzing a plurality of boundary elements contained in the solid section.
As shown in fig. 4A, it shows an effect diagram of a solid cross section after outline grouping and element initialization.
S24, executing the boundary element scan path generating step to generate a scan path segment for the boundary element.
The specific details regarding the boundary element scan path generation step may be determined by:
and S141, determining the Thiessen polygon corresponding to the boundary element.
Specifically, the bisector can be cut into bisector segments by using rays which pass through the end points of the boundary elements and are perpendicular to the boundary elements based on the bisector between the boundary element and other boundary elements. As shown in fig. 4B, which shows an example of a bisector of a single boundary element. Further, the corresponding thieson polygon is generated based on all bisector segments belonging to the boundary elements, wherein the bisector segments belong to both boundary elements defining it, which may be, for example, a directly determining bisector segment satisfying the condition as the corresponding thieson polygon, as shown in fig. 4C for the single element thieson polygon.
And S142, generating a scanning path segment aiming at the boundary element according to the maximum offset distance from the boundary element to the Thiessen polygon and a preset offset distance.
Specifically, when the maximum offset value from the boundary element to the corresponding thiessen polygon is greater than the offset threshold, the offset boundary element may be directly used as the scan path line segment; and when the maximum offset value of the boundary element to the corresponding Thiessen polygon is less than or equal to the offset distance threshold value, generating a scanning path segment according to a non-initial bisector in the Thiessen polygon corresponding to the boundary element, wherein the non-initial bisector is used for indicating that two defined boundary elements of the bisector are not adjacent, and thus generating the scanning path segment aiming at the boundary element.
It is to be understood that the method according to the embodiment of the present invention is not limited to the number of edge elements, and may be single, multiple or all, and all of them should be covered in the protection scope of the embodiment of the present invention.
In a preferred embodiment of the present invention, it may be that the respective print scan path generation methods are implemented for all boundary elements of the solid cross section, as shown in fig. 4D, which shows an example of an element thieson polygon for all boundary elements. In addition, when the print scan path generation method is applied to a plurality of boundary elements, different offset thresholds may be set for the plurality of boundary elements, respectively; performing a boundary element scan path generation step for a plurality of boundary elements of the solid cross section, respectively, based on the set different offset thresholds, to determine a plurality of scan path segments corresponding to the plurality of boundary elements, respectively; and generating a scanning path aiming at the model file to be printed in the 3D mode according to the plurality of determined scanning path sections. Fig. 4E shows scan path segments generated for a solid cross-section at a single offset, and fig. 4F shows scan path segments generated for a solid cross-section at all offsets.
As shown in fig. 5, a flowchart of a thin-wall part 3D printing path generating method according to an embodiment of the present invention includes:
1) the closed contours obtained by slicing the STL model are grouped to obtain connected solid cross-sections (because slicing the STL file will result in closed contours consisting of straight lines).
2) For each boundary element of the solid section, the corresponding Thiessen polygon is solved (here, the distance from all points inside the closed polygon region to the corresponding boundary element is smaller than the distance to other boundary elements). The specific process can be as follows:
2.1) taking one boundary element EleX in the solid section, solving a bisector of the boundary element EleX and other boundary elements (EleN | = EleX), and cutting the bisector into a bisector segment by using a ray which passes through the endpoint of the boundary element and is perpendicular to the boundary element; wherein the bisector segment belongs to all of the two boundary elements defining it.
2.2) in all bisector segments belonging to the current boundary element, taking an initial bisector segment passing through the end point of the boundary element as a current bisector segment CurBi, taking the end point of the boundary element as a starting point CurBiStart of the current bisector, and taking the initial bisector segment passing through the starting point of the boundary element as an ending bisector BiEnd; wherein a bisector is said to be an initial bisector if the two defining boundary elements of the bisector are adjacent.
2.3) adding the current bisector CurBi into a linked list forming the Thiessen polygon, checking whether the current bisector is BiEnd, if so, completing the Thiessen polygon of the current boundary element, and turning to the step 2.5) to execute; otherwise, continuing to carry out the step 2.4);
2.4) solving the intersection point of all other boundary element bisector segments BiCutter and the current bisector segment CurBi, selecting the intersection point closest to the starting point of the current bisector as the end point CurBiEnd of the current bisector, updating the corresponding bisector into the current bisector CurBi, taking the intersection point as the starting point CurBiStart of the updated current bisector, and skipping to the step 2.3) for execution;
2.5) checking whether each boundary element in the solid section is subjected to the calculation of the Thiessen polygon, if so, finishing the generation of the Thiessen polygon of the current solid section; otherwise, the step 2.1) is carried out, and the solving of the next boundary element Thiessen polygon is continued.
3) Generating scanning line segments for each boundary element of the solid section in turn according to an offset distance d (the initial value is d 0) from small to large, wherein the specific flow is as follows:
3.1) initialization offset: d = d 0; initializing boundary element EleN = Ele 1;
3.2) solving the maximum offset distance dMax of the Thiessen polygon of the boundary element EleN; judging whether the condition d < dMax is true or not, and jumping to the step 3.4) to execute if the condition d < dMax is true;
3.3) if d = = d0 and the non-initial bisector in the Thiessen polygon is not marked (flag = = FALSE), sequentially taking the non-initial bisector in the Thiessen polygon as a scanning line segment, marking the corresponding bisector segment (flag = TRUE), and jumping to the step 3.5) for execution; otherwise, directly jumping to the step 3.5) for execution;
3.4) taking the boundary elements after the deviation as scanning line segments;
3.5) judging whether the EleN is the last boundary element, if so, jumping to step 3.6) to execute, otherwise, taking the next boundary element EleN = EleN- > NextEle, and jumping to step 3.2) to execute;
3.6) updating the offset value to be d = d + delta, judging whether the offset value d exceeds a specified maximum offset value dSpecified, and if so, finishing the generation of the scanning path of the solid section; otherwise, initializing the boundary element EleN = Ele1, and jumping to step 3.2).
The method provided by the embodiment of the invention has the advantages of high reliability and small accumulated error, and can obviously improve the 3D printing precision and surface quality of the thin-wall workpiece. As shown in fig. 6, it is a schematic diagram illustrating the effect of the workpiece generated by applying the 3D printing scan path method according to the embodiment of the present invention.
As shown in fig. 7, a 3D printing and scanning system 70 according to an embodiment of the present invention is shown, including: an entity section parsing unit 701 for parsing a model file to be 3D printed to determine connected entity sections with respect to a print object; a boundary element analyzing unit 702, configured to analyze a plurality of boundary elements included in the entity section; the boundary element scanning path segment generating unit 703 includes: a thieson polygon generation module 7031, configured to determine a thieson polygon corresponding to the boundary element; a boundary element scanning path segment generating module 7032, configured to generate a scanning path segment for the boundary element according to a maximum offset distance from the boundary element to the thiessen polygon and a predetermined offset distance threshold.
In some preferred embodiments, the thiessen polygon generation module 7031 is configured to intercept a bisector between the boundary element and other boundary elements as a bisector segment by using a ray that passes through the boundary element end point and is perpendicular to the boundary element; and generating the corresponding Thiessen polygon based on all bisector segments belonging to the boundary elements, wherein a bisector segment belongs to both boundary elements defining it.
The embodiment of the invention also provides a 3D printer, which comprises the 3D printing and scanning system. In yet another aspect, embodiments of the present invention provide a machine-readable storage medium, where instructions (e.g., software program instructions, etc.) are stored on the machine-readable storage medium, and the instructions are used to enable a machine to execute the 3D printing and scanning method described above.
It should be noted that the 3D printer and the 3D printing and scanning system disclosed in the embodiments of the present invention may further include a functional unit or a module corresponding to the above 3D printing and scanning method of the present application, and further, the more specific details and effects thereof may refer to the description of the above method embodiments, and are not repeated herein.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (8)
1. A3D printing and scanning method comprises the following steps:
parsing a model file to be 3D printed to determine connected solid sections about a printed object;
analyzing a plurality of boundary elements contained in the solid section;
performing a boundary element scan path generation step comprising:
determining a Thiessen polygon corresponding to the boundary element; the Thiessen polygon comprises:
based on the bisector between the boundary element and other boundary elements, utilizing the ray which passes through the endpoint of the boundary element and is vertical to the boundary element to cut the bisector into a bisector segment; and
generating the corresponding Thiessen polygon based on all bisector segments belonging to the boundary elements, wherein a bisector segment belongs to both boundary elements defining it;
generating a scanning path segment for the boundary element according to the maximum offset distance of the boundary element to the Thiessen polygon and a predetermined offset threshold value.
2. The method of claim 1, further comprising:
respectively and correspondingly setting different offset threshold values for the plurality of boundary elements;
performing the boundary element scan path generation step for a plurality of boundary elements of the solid cross section, respectively, based on the set different offset thresholds, to determine a plurality of scan path segments corresponding to the plurality of boundary elements, respectively; and
generating a scanning path for the model file to be 3D printed according to the plurality of determined scanning path segments.
3. The method of claim 2, wherein generating the scan path segment for the boundary element as a function of a maximum offset distance of the boundary element to the Thiessen polygon and a predetermined offset threshold comprises:
and when the maximum deviation value from the boundary element to the corresponding Thiessen polygon is greater than the deviation threshold value, taking the deviated boundary element as the scanning path line segment.
4. The method of claim 2, wherein generating the scan path segment for the boundary element as a function of a maximum offset distance of the boundary element to the Thiessen polygon and a predetermined offset threshold comprises:
and when the maximum deviation value of the boundary element to the corresponding Thiessen polygon is less than or equal to the deviation distance threshold value, generating a scanning path segment according to a non-initial bisector in the Thiessen polygon, wherein the non-initial bisector is used for indicating that two defined boundary elements of the bisector are not adjacent.
5. The method of claim 1, wherein parsing the model file to be 3D printed to determine connected solid sections about the printed object comprises:
counting the included times among all outlines in a model file to be 3D printed;
determining all the contours contained for even times as the outer contours of the solid sections; and
all contours contained an odd number of times are determined as the inner contour of the solid section.
6. A 3D print scanning system, comprising:
the solid section analyzing unit is used for analyzing the model file to be 3D printed so as to determine the communicated solid sections of the printing objects;
a boundary element analyzing unit, configured to analyze a plurality of boundary elements included in the entity cross section;
a boundary element scanning path segment generating unit comprising:
the Thiessen polygon generation module is used for determining a Thiessen polygon corresponding to the boundary element; the Thiessen polygon generation module is used for cutting a bisector into a bisector segment by utilizing rays which pass through the end points of the boundary elements and are perpendicular to the boundary elements on the basis of the bisector between the boundary elements and other boundary elements; and generating said corresponding Thiessen polygon based on all bisector segments belonging to said boundary elements, wherein a bisector segment belongs to both boundary elements defining it;
a boundary element scanning path segment generating module, configured to generate a scanning path segment for the boundary element according to a maximum offset distance from the boundary element to the Thiessen polygon and a predetermined offset threshold.
7. A3D printer comprising the 3D print scanning system of claim 6.
8. A machine-readable storage medium having instructions stored therein for controlling a machine to perform the 3D print scan method of any one of claims 1 to 5.
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| US11518092B2 (en) * | 2019-06-19 | 2022-12-06 | Xerox Corporation | Patterned pre-stop for finishing additive manufactured 3D objects |
| CN110509548A (en) * | 2019-08-07 | 2019-11-29 | 安徽卓锐三维科技有限公司 | It is a kind of based on SLS technology can binding face cold compress convalescence device preparation method |
| CN110744055A (en) * | 2019-09-30 | 2020-02-04 | 鑫精合激光科技发展（北京）有限公司 | Laser scanning path planning method and 3D printing method for thin-wall part |
| CN114670450A (en) * | 2022-04-07 | 2022-06-28 | 深圳拓竹科技有限公司 | Method, apparatus, device, storage medium and program product for 3D printing |
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Effective date of registration: 20210204 Address after: 241200 Chungu 3D Printing Industrial Park, Fanchang Economic Development Zone, Wuhu City, Anhui Province Patentee after: Anhui Zhongke Spring Valley Laser Industry Technology Research Institute Co.,Ltd. Address before: 210038 A building, Longgang science and Technology Park, Heng Yuan Road, Nanjing economic and Technological Development Zone, Nanjing, Jiangsu Patentee before: NANJING INSTITUTE OF ADVANCED LASER TECHNOLOGY |