CN113020622B - Controllable porous structure integrated design and manufacturing method for additive manufacturing - Google Patents

Controllable porous structure integrated design and manufacturing method for additive manufacturing Download PDF

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CN113020622B
CN113020622B CN202110231108.1A CN202110231108A CN113020622B CN 113020622 B CN113020622 B CN 113020622B CN 202110231108 A CN202110231108 A CN 202110231108A CN 113020622 B CN113020622 B CN 113020622B
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porous structure
manufacturing
additive manufacturing
model
filling
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CN113020622A (en
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丁力平
谭树杰
张益茬
张曦
曾浩然
张云光
吴沛豪
吴高军
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
    • 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
    • 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
    • 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
    • B33Y80/00—Products made by additive manufacturing

Abstract

The invention discloses an integrated design and manufacturing method of a controllable porous structure for additive manufacturing, which comprises the steps of constructing a shell part model, selecting and constructing a filling parameter structure body P, slicing the model and obtaining a profile polygon; performing contour polygon post-processing; the method adopts an implicit method to express the porous structure, and generates the porous structure additive manufacturing track through a predefined filling pattern, so that the porous structure additive manufacturing track can keep the same precision as the filling pattern, the conversion and transmission time of files with different formats in a traditional processing data chain is avoided, meanwhile, the track generation process is tightly combined with the manufacturing process, the manufacturability of the obtained porous structure is ensured, and the matching degree of the designed porous structure and the manufactured porous structure is improved.

Description

Controllable porous structure integrated design and manufacturing method for additive manufacturing
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a controllable porous structure integrated design and manufacturing method for additive manufacturing.
Background
Additive Manufacturing (AM) technology has a unique ability to handle complex shapes, which makes it an important role in the fabrication of functional periodic porous structures, lattice structures. Some medical and industrial scenarios require the use of porous structures below 200 microns, however, as the feature size decreases, the number of cells and the data of the model (several GB or even tens of GB) become larger, which greatly increases the design and print preparation time of the model;
at present, for such a porous structure and a lattice structure, the existing additive manufacturing design method and the existing pretreatment method have the following problems: firstly, a certain error exists between a design model and a printed physical entity; secondly, limited by file formats and preprocessing modes, for a given porous structure CAD model, it is difficult to consider the generation time and precision of a processing path; finally, due to the fact that manufacturing process constraints such as power input into a heat source, moving speed, placing angle, supporting area and the like are not considered in the design process, it is difficult to ensure that the model can be successfully processed at one time, which brings great risk to an additive manufacturing service enterprise, and therefore, an additive manufacturing-oriented integrated design and manufacturing method of a controllable porous structure is urgently needed to solve the problems.
Disclosure of Invention
The invention provides a controllable porous structure integrated design and manufacturing method for additive manufacturing, and solves the problems that in the prior art, additive manufacturing precision is low, machining success rate is low, model conversion is needed, and time is wasted.
In order to achieve the purpose, the invention provides the following technical scheme: a controllable porous structure integrated design and manufacturing method for additive manufacturing comprises the following specific steps:
s1, constructing a shell part model, creating a solid model, and adjusting the posture of the model according to the orientation of the multiple holes;
s2, selecting and constructing a filling parameter structure body P, selecting a proper manufacturing process parameter P _ P and a proper porous structure parameter P _ S from a manufacturing process parameter database and a porous structure parameter database, and constructing the filling parameter structure body P by using the two parameters;
s3, slicing the model and obtaining a contour polygon;
s4, performing post-processing on the outline polygon, specifically: shifting and dividing the outline polygon, distributing different parameter structural bodies P to different areas, and then carrying out optimization adjustment on process parameters according to the characteristics of the areas;
s5, generating and optimizing the track of the outline polygon in S4, specifically:
a. acquiring corresponding porous structure parameters and manufacturing process parameters according to the filling parameters;
b. filling the polygon obtained in the step 4 according to the porous structure parameters and the manufacturing process parameters to generate a processing track;
c. connecting and optimizing a processing track;
and S6, sending the optimized model to additive manufacturing equipment for manufacturing the porous structure.
Preferably, in step S1, the CAD entity model can be created in Solid entity form or mesh patch form.
Preferably, in step S1, for the multi-oriented composite porous structure, the model is segmented and the porous pattern is marked.
Preferably, in step S2, SLM technique is used, wherein the manufacturing process parameters include laser power (L _ P), scanning speed (v), slice layer thickness (S _ T) and spot compensation (S _ C).
Preferably, in step S2, the porous structure parameter P _ S includes a filling pattern (F _ P), a filling angle (F _ a), and a filling cell (U _ S) size.
Preferably, in step S3, the slice layer thickness is a preset fixed value or an adaptive thickness.
Preferably, in step S3, the slicing the model specifically includes:
a. generating a group of planes in the z direction according to the position of the part and the thickness of the sliced layer, wherein the expression is as follows:
Figure BDA0002958143450000031
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing a closed contour according to the intersection result;
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
Preferably, in step S6, the additive manufacturing apparatus is a metal additive manufacturing apparatus or a non-metal additive manufacturing apparatus, and includes a selective laser melting apparatus, a laser melting deposition apparatus, an electron beam additive manufacturing apparatus, a photocuring molding apparatus, an FDM apparatus, and a selective laser sintering apparatus.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts an implicit method to express the porous structure, and generates the porous structure additive manufacturing track through the predefined filling pattern, so that the porous structure additive manufacturing track can keep the same precision as the filling pattern, and avoids the conversion and transmission time of files with different formats in a traditional processing data chain.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a flow chart of a method of manufacture of the present invention;
FIG. 2 is a diagram of a cube model of the present invention;
FIG. 3 is a diagram of the cubic slicing process of the present invention;
FIG. 4 is a first level trace of the quadrilateral curvilinear channel structure of the present invention;
FIG. 5 is a trace diagram of the first and tenth layers of the hexagonal lattice structure of the present invention;
FIG. 6 is a trace diagram of the first layer of the porous structure of TPMS-Schwarz-P of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, a method for integrally designing and manufacturing a controllable porous structure for additive manufacturing, wherein the porous structure is a periodic cellular structure and includes a pore channel structure, a lattice structure and a TPMS structure, and the method specifically includes the steps of:
s1, constructing a shell part model, creating a Solid model, creating a CAD model in a Solid entity or mesh patch form, wherein the CAD model format comprises ' x _ t ', ' iges ', ' step ', ' STL ', obj ', and the like, adjusting the posture of the model according to the orientation of the multiple holes, and segmenting the model and marking the multiple holes for the multi-oriented composite porous structure.
S2, selecting and constructing a filling parameter structure body P, selecting a proper manufacturing process parameter P _ P and a proper porous structure parameter P _ S from a manufacturing process parameter database and a porous structure parameter database, and constructing the filling parameter structure body P by using the two parameters;
the manufacturing process parameters are determined by a manufacturing process route, taking the SLM technology as an example, wherein the manufacturing process parameters comprise laser power (L _ P), scanning speed (v), slice layer thickness (S _ T) and light spot compensation (S _ C), and the porous structure parameter P _ S comprises a filling pattern (F _ P), a filling angle (F _ A) and a filling unit (U _ S) size;
s3, slicing the model to obtain a profile polygon, wherein the thickness of the sliced layer can be a preset fixed value during slicing, and the thickness can be self-adapted according to actual conditions; wherein, slicing the model specifically comprises:
a. generating a group of planes in the z direction according to the position of the part and the thickness of the sliced layer, wherein the expression is as follows:
Figure BDA0002958143450000051
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing a closed contour according to the intersection result;
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
S4, performing post-processing on the outline polygon, specifically: shifting and dividing the outline polygon, distributing different parameter structural bodies P to different areas, and then carrying out optimization adjustment on process parameters according to the characteristics of the areas;
s5, generating and optimizing the track of the outline polygon in S4, specifically:
a. acquiring corresponding porous structure parameters and manufacturing process parameters according to the filling parameters;
b. filling the polygon obtained in the step 4 according to the porous structure parameters and the manufacturing process parameters to generate a processing track;
c. connecting and optimizing a processing track;
and S6, sending the optimized model into additive manufacturing equipment to manufacture a porous structure, wherein the additive manufacturing equipment can adopt metal additive manufacturing equipment or nonmetal additive manufacturing equipment, and specifically comprises Selective Laser Melting (SLM) equipment, Laser Melting Deposition (LMD) equipment, electron beam additive manufacturing (EBM) equipment, photocuring molding (SLA) equipment, FDM equipment and selective laser Sintering (SLA) equipment.
Embodiment 1, the method in fig. 1 is adopted to integrally design and manufacture the quadrilateral curved channel structure, specifically:
s1, constructing a shell part model, wherein the present embodiment adopts a simple cubic model, the size of the model is 10mm × 10mm, the format of the model is STL, the posture is adjusted, and the model is placed in the position shown in fig. 2;
s2, selecting and constructing a filling parameter structure body, wherein the structure is a hexagonal curve channel structure, the filling pattern is a hexagon, and the curve equation is
Figure BDA0002958143450000061
Wherein, the wall thickness is 0.1mm, and proper manufacturing process parameters PP are selected from a manufacturing process parameter library according to the wall thickness: the laser power L _ P is 90W, the scanning speed v is 1200mm/S, the spot compensation S _ C is 0.05mm, and the slice thickness S _ T is 0.03 mm; selecting a porous structure parameter P _ S from a porous structure parameter database: a complete parameter structure P is constructed by using the above parameters, where the filling pattern F _ P ═ rectangle', the filling cell size U _ S ═ 2mm, and the filling angle F _ a ═ 45 °;
s3, slicing the shell model, including:
a. constructing a group of planes according to the slice layer thickness and the model position, wherein the plane cluster equation is as follows:
Ωp＝{p|p(x,y,z):z＝(i-1)*0.03,i＝1,2,，3，...334}；
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing the closed contour according to the intersection result (point, line);
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
S4, shifting the contour obtained in the step S3, wherein the shifting distance is facula compensation S _ C, the shifting direction is inward, and the parameter structure body P is divided into shifted areas;
s5, generating and optimizing the track by using the polygon obtained in the step S4, specifically comprising the following steps:
a. acquiring a porous structure parameter P _ S and a manufacturing process parameter P _ P of a corresponding area according to the filling parameters;
b. filling the polygon obtained in the step S4 according to the porous structure parameter P _ S and the manufacturing process parameter P _ P to generate a processing trajectory, wherein the filling pattern in this embodiment is a quadrilateral, each filling parameter is obtained from the parameter structure, and the specific filling method is as follows: first, the square is rotated clockwise by 45 °; then, a set of straight lines parallel to the y-axis is generated, the equation of which is: omegal-8+ (i-1) × 2, i-1, 2, 3.. 9 }; then, intersecting the polygon with parallel lines, and taking line segments inside the square; finally, the obtained line segment is rotated by 45 degrees in a counterclockwise direction to obtain a filling line in one direction, wherein the rotation angle of the filling line in the other direction is changed to 135 degrees, and then the operations are repeated to obtain the filling line;
c. connecting and optimizing processing tracks according to an algorithm, wherein in the embodiment, the processing tracks of each layer of the hexagonal curved channel are similar, only one offset is arranged at the central position, and the processing track of the first layer is shown in FIG. 3;
and S6, sending the generated processing track to SLM equipment for printing.
Embodiment 2, the method in fig. 1 is adopted to integrally design and manufacture the hexagonal lattice structure, specifically:
s1, constructing a shell part model, in this embodiment, a simple cubic model is adopted, the model size is 10mm × 10mm, the model format is STL, the posture is adjusted, and the shell part model is placed in the position shown in fig. 2;
s2, selecting and constructing a filling parameter structure body, wherein the structure is a hexagonal lattice structure, and filling patterns of the structure comprise a hexagonal lattice structure and a circular lattice structure; wherein, the wall thickness is 0.1mm, firstly, the proper manufacturing process parameter PP is selected from a manufacturing process parameter library according to the wall thickness: the laser power L _ P is 90W, the scanning speed v is 1200mm/S, the spot compensation S _ C is 0.05mm, and the slice thickness S _ T is 0.03 mm; then selecting a porous structure parameter P _ S from the porous structure parameter database: the filling pattern F _ P ═ hexagon-scaffold', the filling cell size U _ S ═ 2mm, the filling angle F _ a ═ 0 °, the hexagonal layer thickness H _ LT ═ 0.48mm, the strut layer thickness P _ LT ═ 0.48mm, and the strut radius 0.2 mm. Constructing a complete parameter structure P by using the parameters;
s3, slicing the shell model, including:
a. constructing a group of planes according to the slice layer thickness and the model position, wherein the plane cluster equation is as follows:
Ωp＝{p|p(x,y,z):z＝(i-1)*0.03,i＝1,2,，3，...334}；
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing the closed contour according to the intersection result (point, line);
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
S4, shifting the contour obtained in the step S3, wherein the shifting distance is facula compensation S _ C, the shifting direction is inward, and the parameter structure body P is divided into shifted areas;
s5, generating and optimizing the track by using the polygon obtained in the step S4, specifically comprising the following steps:
a. acquiring a porous structure parameter P _ S and a manufacturing process parameter P _ P of a corresponding area according to the filling parameters;
b. according to the porous structure parameter P _ S and the manufacturing process parameter P _ P, the polygon obtained in step S4 is filled to generate a processing track, wherein the filling pattern in this embodiment is a hexagon, the pillar layer filling pattern is a circular array, each filling parameter is obtained from the parameter structure, and the specific filling method is as follows:
1) generating a hexagonal central lattice, wherein the coordinates are as follows:
Figure BDA0002958143450000091
Figure BDA0002958143450000092
2) intersecting the square with the central dot matrix, and taking points inside the square and points where the hexagon and the square are intersected;
3) and generating a half of a hexagon around the central point, wherein a 'C' molded line is formed, and the coordinates of each point on the line are as follows:
point A:
Figure BDA0002958143450000093
point B:
Figure BDA0002958143450000094
point C:
Figure BDA0002958143450000095
point D:
Figure BDA0002958143450000096
4) intersecting the 'C' molded line and the square, and taking a line in the square;
repeating the steps 3) and 4) until all lines are filled;
wherein, the pillar layer filling mode is:
1) reading all hexagonal end points in the hexagonal layer;
2) removing repeated end points;
3) generating a circle with the end point as the center of the circle and the radius of 0.2 mm;
c. connecting and optimizing processing tracks according to an algorithm, wherein the hexagonal lattice structure in the embodiment has two different filling layer tracks, namely a hexagonal layer and a strut layer, and the processing tracks of the two types of filling layers are shown in fig. 4 and 5;
and S6, sending the generated processing track to SLM equipment for printing.
Embodiment 3, the method in fig. 1 is adopted to integrally design and manufacture the porous structure of the TPMS, specifically:
s1, constructing a shell part model, in this embodiment, a simple cubic model is adopted, the model size is 10mm × 10mm, the model format is STL, the posture is adjusted, and the shell part model is placed in the position shown in fig. 2;
s2, selecting and constructing a filling parameter structure body, wherein the structure is TPMS-Diamond, and the filling style is TPMS-Diamond;
the structure is a TPMS-Diamond structure, wherein the wall thickness is 0.1mm, and proper manufacturing process parameters PP are selected from a manufacturing process parameter library according to the wall thickness: the laser power L _ P is 90W, the scanning speed v is 1800mm/S, the spot compensation S _ C is 0.05mm, and the slice thickness S _ T is 0.03 mm; then selecting a porous structure parameter P _ P from a porous structure parameter database, wherein the filling pattern F _ P is 'TPMS-Diamond', the filling unit size U _ S is 1mm, the filling angle F _ A is 0 DEG, and the shape control factor c is 0, and constructing a complete parameter structure body P by using the parameters;
s3, slicing the shell model, including:
a. constructing a group of planes according to the slice layer thickness and the model position, wherein the plane cluster equation is as follows:
Ωp＝{p|p(x,y,z):z＝(i-1)*0.03,i＝1,2,，3，...334}；
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing the closed contour according to the intersection result (point, line);
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
S4, shifting the contour obtained in the step S3, wherein the shifting distance is facula compensation S _ C, the shifting direction is inward, and the parameter structure body P is divided into shifted areas;
s5, generating and optimizing the track by using the polygon obtained in the step S4, specifically comprising the following steps:
a. acquiring a porous structure parameter P _ S and a manufacturing process parameter P _ P of a corresponding area according to the filling parameters;
b. filling the polygon obtained in the step S4 according to the porous structure parameter P _ S and the manufacturing process parameter P _ P to generate a processing trajectory, wherein the filling pattern in this embodiment is TPMS-Diamond, each filling parameter is obtained from the parameter structure, and the specific filling method is as follows:
1) generating a track of a cell according to a TPMS-Diamond surface equation, wherein the equation is as follows:
cos2πx*cos2πy*cos2πz-sin2πx*sin2πy*sin2πz＝0；
2) generating a lattice, wherein the lattice coordinate is as follows:
Ωpoint1＝{point|point(x,y):x＝(i)*1,y＝(i)*1,i＝-7,-6,-5,...7}；
3) intersecting the square with the dot matrix, distinguishing edge points, inner points and outer points, and discarding the outer points;
4) translating the track generated in the step 1) to each point in the dot matrix;
5) intersecting the translated tracks on the edge points with the square;
c. connecting and optimizing processing tracks according to an algorithm, wherein the processing track of the first layer of the TPMS-Diamond porous structure in the embodiment is shown in FIG. 6;
and S6, sending the generated processing track to SLM equipment for printing.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A controllable porous structure integrated design and manufacturing method for additive manufacturing is characterized by comprising the following specific steps:
s1, constructing a shell part model, creating a solid model, and adjusting the posture of the model according to the orientation of the multiple holes;
s2, selecting and constructing a filling parameter structure body P, selecting a proper manufacturing process parameter P _ P and a proper porous structure parameter P _ S from a manufacturing process parameter database and a porous structure parameter database, and constructing the filling parameter structure body P by using the two parameters;
s3, slicing the model and obtaining a contour polygon;
s4, performing post-processing on the outline polygon, specifically: shifting and dividing the outline polygon, distributing different parameter structural bodies P to different areas, and then carrying out optimization adjustment on process parameters according to the characteristics of the areas;
s5, generating and optimizing the track of the outline polygon in S4, specifically:
a. acquiring corresponding porous structure parameters and manufacturing process parameters according to the filling parameters;
b. filling the polygon obtained in the step 4 according to the porous structure parameters and the manufacturing process parameters to generate a processing track;
c. connecting and optimizing a processing track;
and S6, sending the optimized model to additive manufacturing equipment for manufacturing the porous structure.
2. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S1, a CAD Solid model is created in Solid form or mesh patch form.
3. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S1, for the multi-oriented composite porous structure, the model is segmented and the porous pattern is marked.
4. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S2, wherein the SLM technique is employed, the manufacturing process parameters include laser power (L _ P), scanning speed (v), slice layer thickness (S _ T), and spot compensation (S _ C).
5. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 4, wherein: in step S2, the porous structure parameter P _ S includes a filling pattern (F _ P), a filling angle (F _ a), and a filling cell (U _ S) size.
6. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S3, the slice layer thickness is a preset fixed value or an adaptive thickness.
7. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S3, the slicing the model specifically includes:
a. generating a group of planes in the z direction according to the position of the part and the thickness of the sliced layer, wherein the expression is as follows:
Figure FDA0003420641240000021
b. selecting a corresponding triangular patch from the STL model according to the height of the plane;
c. intersecting the triangular patch with the plane;
d. reconstructing a closed contour according to the intersection result;
e. constructing a polygon according to the outline;
f. and selecting the next plane, and repeating the b-e operation until the intersection of all planes and the STL model is completed.
8. The method for manufacturing the controllable porous structure integrated design facing the additive manufacturing according to claim 1, wherein: in step S6, the additive manufacturing apparatus is a metal additive manufacturing apparatus or a non-metal additive manufacturing apparatus, including a selective laser melting apparatus, a laser melting deposition apparatus, an electron beam additive manufacturing apparatus, a photocuring molding apparatus, an FDM apparatus, and a selective laser sintering apparatus.
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