CN104890237A - 3D printing method and system thereof - Google Patents
3D printing method and system thereof Download PDFInfo
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- CN104890237A CN104890237A CN201510217429.0A CN201510217429A CN104890237A CN 104890237 A CN104890237 A CN 104890237A CN 201510217429 A CN201510217429 A CN 201510217429A CN 104890237 A CN104890237 A CN 104890237A
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- planar polygons
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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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention relates to the technical field of printing, and discloses a 3D printing method and a system thereof. The method comprises the following steps: transiting a material information recorded 3D model to be printed to a plurality of layers of 2D polygons in order to make each of the 2D polygons include the material information; dividing the 2D polygons including various types of material information in each layer into a plurality of 2D sub-polygons in order to make each of the 2D sub-polygons only include one type of the material information; and controlling a plurality of nozzles to print the 2D sub-polygons by layer one by one according to the material information included in each of the 2D sub-polygons. The invention also discloses the 3D printing system. Multi-nozzle and multi-material 3D printing is realized in the invention.
Description
Technical field
The present invention relates to printing technique field, particularly a kind of 3D Method of printing and system.
Background technology
For fused glass pellet (Fused Deposition Modeling, FDM) three-dimensional printing technology, existing main flow three-dimensional printing technology is the slicer technology of single head monochrome, and it designs for printing monochrome object (i.e. mono-material object).In general, Print All process is completed by a shower nozzle, first install before each printing print raw material required for material, user selects a kind of color (the PLA plastics of two kinds of colors can think the PLA plastics of two kinds of different materials) liked.First the three-dimensional geometric information of model is converted to planar polygons by slicing (section) process by Slicer technology.This slicing process only processes geological information, does not process material information.Simultaneously, the model format of model also normally not with material information, such as: STL.Therefore, the three-dimensional printer that current individual consumer uses can only realize the printing of single spraying head and mono-material.The 3D printing technique how realizing many shower nozzles and many materials is problem demanding prompt solution.
Summary of the invention
The object of this invention is to provide a kind of 3D Method of printing, to realize the 3D printing technique of many shower nozzles, many colors and many materials.
According to an aspect of the present invention, provide a kind of 3D Method of printing, comprising:
The threedimensional model to be printed recording material information is converted to multilayer two-dimension polygon, and makes each planar polygons comprise described material information;
Being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, making each described sub-planar polygons only comprise a kind of material information;
Control multiple shower nozzle and print described sub-planar polygons with the material information that often a sub-planar polygons comprises one by one by layer.
Wherein, material information described in the triangular facet record adopting described threedimensional model surface, and adopt the material information that the line segment on the limit of described planar polygons comprises to record this planar polygons.
Wherein, the step described planar polygons being divided into some sub-planar polygons comprises:
Generate the axis of described planar polygons;
Be connected with axis by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
The new polygon comprising identical material information is carried out boolean's union, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.
Wherein, the step generating the axis of described planar polygons comprises:
Adopt Delaunay method to carry out triangulation to described planar polygons, make the limit of some subdivision lines and described planar polygons generate triangular mesh;
The axis of planar polygons described in the middle dot generation connecting subdivision line described in each.
Wherein, the step generating the axis of described planar polygons comprises: the axis adopting planar polygons described in Voronoi map generalization.
Wherein, the step generating the axis of described planar polygons comprises:
Employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, for convex planar polygons, after two angular bisectors intersect generation intersection point, described two angular bisectors are merged, form a new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis; Or for recessed planar polygons, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis.
Wherein, the step described planar polygons being divided into some sub-planar polygons comprises:
Indentation is carried out to described planar polygons, to generate indentation line;
Be connected with indentation line by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
The new polygon comprising identical material information is carried out boolean's union, merges the multiple new polygon with the line segment of adjacent identical material information, to generate described sub-planar polygons.
Wherein, indentation is carried out to described planar polygons, comprise with the step generating indentation line: employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, generates described indentation line after indentation preset distance.
Wherein, after the described sub-planar polygons of formation, before printing described sub-planar polygons, also comprise: the sub-planar polygons comprising identical material information is divided into one group, forming some groups of sub-planar polygons, printing the described sub-planar polygons of same layer when printing by group.
Wherein, after having printed the sub-planar polygons of one deck, when printing lower one deck, first print the sub-planar polygons with material identical with the material that current shower nozzle sprays.
Wherein, when printing described sub-planar polygons, the starting point and ending point of selection shower nozzle is the point in described sub-planar polygons.
Wherein, described starting point and ending point is first point in described sub-planar polygons.
According to another aspect of the present invention, provide a kind of 3D print system, comprising:
Model conversion unit, for the threedimensional model to be printed recording material information is converted to multilayer two-dimension polygon, and makes each planar polygons comprise described material information;
Polygon dividing unit, for being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, makes each described sub-planar polygons only comprise a kind of material information;
Print control unit, the material information comprised with every sub-planar polygons for controlling multiple shower nozzle prints described sub-planar polygons one by one by layer.
Wherein, material information described in the triangular facet record adopting described threedimensional model surface, and adopt the material information that the line segment on the limit of described planar polygons comprises to record this planar polygons.
Wherein, described polygon dividing unit comprises:
Axis generation unit, for generating the axis of described planar polygons;
New polygon generation unit, for being connected with axis by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
Sub-polygon generation unit, for the new polygon comprising identical material information is carried out boolean's union, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.
Wherein, described axis generation unit comprises:
Triangulation unit, for adopting Delaunay method to carry out triangulation to described planar polygons, makes the limit of some subdivision lines and described planar polygons generate triangular mesh;
Subdivision line linkage unit, for connecting the axis of planar polygons described in dot generation in subdivision line described in each.
Wherein, described axis generation unit specifically adopts the axis of planar polygons described in Voronoi map generalization.
Wherein, described axis generation unit specifically adopts Straight Skeleton method to carry out indentation along the angular bisector of described planar polygons to described planar polygons, for convex planar polygons, after two angular bisectors intersect generation intersection point, described two angular bisectors are merged, form a new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis; Or for recessed planar polygons, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis.
Wherein, polygon dividing unit comprises:
Indentation line generation unit, for carrying out indentation to described planar polygons, to generate indentation line;
New polygon generation unit, for being connected with indentation line by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
Sub-polygon generation unit, for the new polygon comprising identical material information is carried out boolean's union, merges the multiple new polygon with the line segment of adjacent identical material information, to generate described sub-planar polygons.
Wherein, described indentation line generation unit specifically adopts Straight Skeleton method to carry out indentation along the angular bisector of described planar polygons to described planar polygons, generates described indentation line after indentation preset distance.
Wherein, described 3D print system also comprises: grouped element, for the sub-planar polygons comprising identical material information is divided into one group, forms some groups of sub-planar polygons, prints the described sub-planar polygons of same layer when printing by group.
Wherein, described print control unit, specifically for after having printed the sub-planar polygons of one deck, first prints the sub-planar polygons with material identical with the material that current shower nozzle sprays when printing lower one deck.
Wherein, described 3D print system also comprises: selection unit, and for when printing described sub-planar polygons, the starting point and ending point of selection shower nozzle is the point in described sub-planar polygons.
Wherein, described starting point and ending point is specifically elected as first point in described sub-planar polygons by described selection unit.
3D Method of printing of the present invention is by being divided into several sub-planar polygons comprising material information of the same race by the planar polygons comprising various material information by material, adopt the Slicer of many shower nozzles (often kind of corresponding shower nozzle of material) to print to every sub-planar polygons, thus the 3D achieving many shower nozzles and many materials print.
Accompanying drawing explanation
Fig. 1 is the 3D Method of printing flow chart of first embodiment of the invention;
Fig. 2 is a kind of double-colored 3D model schematic;
3D model slice in Fig. 2 is become the polygonal schematic diagram of multilayer two-dimension by Fig. 3;
Fig. 4 is the schematic diagram of later layer with the planar polygons of material information of cutting into slices in Fig. 3;
Fig. 5 is a kind of particular flow sheet of step S200 in Fig. 1;
Fig. 6 is that a kind of threedimensional model is sliced into the polygonal schematic diagram of multilayer two-dimension;
Fig. 7 is the schematic diagram of planar polygons based on Delaunay method generation axis of Fig. 6;
Fig. 8 is the schematic diagram of planar polygons based on Straight Skeleton method generation axis of Fig. 6;
Fig. 9 is the schematic diagram based on Straight Skeleton method, convex polygon being generated to axis;
Figure 10 is the schematic diagram based on Straight Skeleton method, concave polygon being generated to axis;
Figure 11 is that the planar polygons of Fig. 6 generates new polygonal schematic diagram based on Delaunay method
Figure 12 is that the planar polygons of Fig. 6 generates new polygonal schematic diagram based on Straight Skeleton method;
Figure 13 is that the planar polygons of Fig. 6 generates the schematic diagram comprising the sub-planar polygons of material A based on Delaunay method
Figure 14 is that the planar polygons of Fig. 6 generates the schematic diagram comprising the sub-planar polygons of material A based on Straight Skeleton method;
Figure 15 is that the planar polygons of Fig. 6 generates the schematic diagram comprising the sub-planar polygons of material B based on Delaunay method
Figure 16 is that the planar polygons of Fig. 6 generates the schematic diagram comprising the sub-planar polygons of material B based on Straight Skeleton method;
Figure 17 is the another kind of particular flow sheet of step S200 in Fig. 1;
Figure 18 is that another kind of threedimensional model is sliced into multilayer two-dimension polygon and the schematic diagram of indentation line is shown;
Figure 19 is the new polygonal schematic diagram that the planar polygons of Figure 18 utilizes indentation line to generate;
Figure 20 is the schematic diagram comprising the sub-planar polygons of material A that the planar polygons of Figure 18 utilizes indentation line to generate;
Figure 21 is the schematic diagram comprising the sub-planar polygons of material B that the planar polygons of Figure 18 utilizes indentation line to generate;
Figure 22 is the situation of the indentation line that the planar polygons of Figure 18 utilizes distance to be jet diameters;
Figure 23 is a kind of 3D print system structural representation of the embodiment of the present invention;
Figure 24 is a kind of concrete structure schematic diagram of polygon dividing unit in Figure 23;
Figure 25 is the another kind of concrete structure schematic diagram of polygon dividing unit in Figure 23;
Figure 26 is the another kind of 3D print system structural representation of the embodiment of the present invention;
Figure 27 is another 3D print system structural representation of the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with detailed description of the invention also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
An embodiment provides a kind of 3D Method of printing, its flow process as shown in Figure 1, comprising:
Step S100, is converted to multilayer two-dimension polygon by the threedimensional model to be printed recording material information, and makes each planar polygons comprise described material information.
Step S200, is divided into some sub-planar polygons by comprising various material information planar polygons in every layer, makes each described sub-planar polygons only comprise a kind of material information.
Step S300, controls multiple shower nozzle and prints described sub-planar polygons with the material information that often a sub-planar polygons comprises one by one by layer.
3D Method of printing of the present invention is by being divided into several sub-planar polygons comprising material information of the same race by the planar polygons comprising various material information by material, adopt the Slicer of many shower nozzles (often kind of corresponding shower nozzle of material) to print to every sub-planar polygons, thus the 3D achieving many shower nozzles and many materials print.
Step S100 is actual is the process of being cut into slices by threedimensional model, is cut into multilayer two-dimension polygon, successively to print.The present embodiment adopts the file format supporting material, as: 3MF, PLY, OBJ or AMF, material information is recorded in (usual threedimensional model is the surface adopting triangular facet to carry out approximate simulation object) on the triangular facet on threedimensional model surface, namely material properties is increased to triangular facet.To print the threedimensional model of two kinds of materials, as shown in Figure 2, a cube is made up of 12 triangles, and wherein a triangle in front is black, and other triangles are white.
Be planar polygons by threedimensional model by slicing method migration, due on the face of threedimensional model with material information, the matter that therefore needs a person with the qualifications of a general information slicing, makes each planar polygons comprise material information.The material information adopting the line segment on the limit of described planar polygons to comprise to record this planar polygons in the slicing process of the present embodiment, opposite side increases material properties.After section, triangular facet is cut into some layers, and the attribute corresponding planar polygons limit being recorded material information is identical with the material properties of triangular facet record.Such as material information is also carried out slicing by above-mentioned cube simultaneously, obtains the planar polygons being with material information.As shown in Figure 3, this cube has been divided 20 layers, every layer is a planar polygons, each planar polygons as shown in Figure 4, (thicker solid line represents black to have one section of black at least, thinner solid line represent white) line segment, Fig. 4 comprises the line segment of ab and bc two sections of adjacent black materials.Because threedimensional model has various material, therefore, each planar polygons may comprise various material information.
In step S200, being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, making each described sub-planar polygons only comprise a kind of material information.Planar polygons is divided into some sub-planar polygons and can comprises two kinds of modes.
The concrete steps of mode one as shown in Figure 5, comprising:
Step S211, generates the axis of described planar polygons.Adopt Delaunay, Voronoi or Straight Skeleton (straight skeleton) method to generate the axis of planar polygons in the present embodiment, skeleton method based on Delaunay triangulation is very similar with the method for the structure polygon element line based on Voronoi figure (also claiming Thiessen polygon figure), generates polygon element line be respectively below described for Delaunay and Straight Skeleton.As shown in Figure 6, for comprise two kinds of materials threedimensional model section after a planar polygons, wherein A (heavy black line) represents a kind of material, and B (black thin) represents another kind of material.
As shown in Figure 7, for Delaunay method, triangulation is carried out to planar polygons, make some subdivision lines (in Fig. 7 shown in dotted line) generate triangular mesh with the limit of described planar polygons; Connect the axis of the middle dot generation planar polygons of each subdivision line (in other distortion of Delaunay method, axis can also be generated by the line of the geometric center such as barycenter oftriangle and unfaithful intention and all be suitable for the present invention), as shown in the black solid line in the middle of planar polygons in Fig. 7.
As shown in Fig. 8,9 and 10, for Straight Skeleton method, the angular bisector along planar polygons carries out indentation to described planar polygons.As shown in Figure 9, for convex planar polygons, after two angular bisectors intersect generation intersection point, two angular bisectors are carried out merge (after two angular bisector intersects, point of intersection just as new angle, continues same operation to indentation direction), form a new polygon (as shown in shadow region in Fig. 9), to described new polygon by its angular bisector indentation, until generate the axis of planar polygons; Or for recessed planar polygons, as shown in Figure 10, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon (as shown in shadow region in Figure 10), to described new polygon by its angular bisector indentation, until generate polygonal axis.The axis of final formation is as shown in the black line in the middle of polygon in Fig. 8.
Step S212, is connected the line segment comprising material information of the same race with axis, is the minimum new polygon closed of the area on a limit to generate some with the line segment comprising described material information of the same race.As shown in heavy black line in Figure 11 and 12, be respectively the new polygon comprising material A obtained based on Delaunay and Straight Skeleton method.
Step S213, carries out boolean's union by the new polygon comprising identical material information, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.As shown in Figs. 13 and 14, be respectively merge new polygon based on Delaunay and Straight Skeleton method after the sub-planar polygons comprising material A that obtains.In the present embodiment, owing to only including two kinds of materials, therefore former polygon and material a-quadrant polygon can be carried out Boolean subtraction calculation, obtain the region of B, as shown in figs, be respectively merge new polygon based on Delaunay and Straight Skeleton method after the sub-planar polygons comprising material B that obtains.
The concrete steps of mode two as shown in figure 17, comprising:
Step S221, carries out indentation to described planar polygons, to generate indentation line.The step generating indentation line comprises: adopt Straight Skeleton method (being not limited to Straight Skeleton method) to carry out indentation along the angular bisector of described planar polygons to described planar polygons, generate indentation line after indentation preset distance.As shown in figure 18, for comprise two kinds of materials threedimensional model section after another planar polygons, wherein A (heavy black line) represents a kind of material, and B (black thin) represents another kind of material.The inside indentation of angular bisector along planar polygons, each certain distance just can form an indentation line, as shown in phantom in Figure 18.
Step S222, is connected the line segment comprising material information of the same race with indentation line, is the minimum new polygon closed of the area on a limit to generate some with the line segment comprising described material information of the same race.As shown in heavy black line in Figure 19, three the new polygons comprising material A obtained.
Step S223, carries out boolean's union by the new polygon comprising identical material information, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.As shown in figure 20, the sub-planar polygons comprising material A for obtaining after merging new polygon.In the present embodiment, owing to only including two kinds of materials, therefore former polygon and material a-quadrant polygon can be carried out Boolean subtraction calculation, obtain the region of B, as shown in figure 21, be the sub-planar polygons comprising material B obtained after merging new polygon.
In step S221, when indentation distance is enough large, then generate polygonal axis (namely adopting the axis that Straight Skeleton generates in mode one).In addition, in extreme circumstances, when indentation distance is the diameter of printing head, as shown in figure 22, monochromatic polygonal region is solid area, without inner filling part.I.e. indentation distance determines the size of the planar polygons area of the threedimensional model of printing, therefore can set indentation distance according to actual conditions.
Division methods in the present embodiment step S200 is also applicable to comprise the non-conterminous situation of line segment of material of the same race and porose planar polygons.
Further, changing number of times when printing to reduce shower nozzle, also comprising between step S200 and S300 and the sub-planar polygons comprising identical material is divided into one group, forming the some groups of sub-planar polygons with material, when printing, print the sub-planar polygons with layer by group.Further, under printing after having printed one deck during one deck, first print the sub-planar polygons with material identical with the material that current shower nozzle sprays, namely print the sub-planar polygons with last layer with identical material, make interlayer to change shower nozzle.
Due to shower nozzle from extrude material to stable, need certain distance (this distance is general very little).Therefore, further, during printing, the starting point and ending point of selection shower nozzle is the point in sub-planar polygons.Make the instability distance of shower nozzle as far as possible at interior of articles, when shower nozzle moves to outer surface, enter stable state, by printing objects outer surface, be there is good smooth degree like this.Further, starting point and ending point is first point in sub-planar polygons, and first point is the point from most portionafrom theasurface, and the distance making the acquisition of shower nozzle stable is longer, and external surface of objects is more smooth.
Present invention also offers a kind of 3D print system, as shown in figure 23, comprising:
Model conversion unit 100, for the threedimensional model to be printed recording material information is converted to multilayer two-dimension polygon, and makes each planar polygons comprise described material information.
Polygon dividing unit 200, for being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, makes each described sub-planar polygons only comprise a kind of material information.
Print control unit 300, the material information comprised with every sub-planar polygons for controlling multiple shower nozzle prints described sub-planar polygons one by one by layer.
Particularly, material information described in the triangular facet record adopting described threedimensional model surface in model conversion unit 100, and adopt the material information that the line segment on the limit of described planar polygons comprises to record this planar polygons.
Particularly, as shown in figure 24, be a kind of detailed description of the invention of polygon dividing unit 200, comprise:
Axis generation unit 211, for generating the axis of described planar polygons.
New polygon generation unit 212, for being connected with axis by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race.
Sub-polygon generation unit 213, for the new polygon comprising identical material information is carried out boolean's union, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.
Wherein, described axis generation unit 211 comprises:
Triangulation unit, for adopting Delaunay method to carry out triangulation to described planar polygons, makes the limit of some subdivision lines and described planar polygons generate triangular mesh.
Subdivision line linkage unit, for connecting the axis of planar polygons described in dot generation in subdivision line described in each.
Axis generation unit 211 can also the concrete axis adopting planar polygons described in Voronoi map generalization.
Axis generation unit 211 can also specifically adopt Straight Skeleton method to carry out indentation along the angular bisector of described planar polygons to described planar polygons, for convex planar polygons, after two angular bisectors intersect generation intersection point, described two angular bisectors are merged, form a new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis; Or for recessed planar polygons, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis.
As shown in figure 25, be the another kind of detailed description of the invention of polygon dividing unit 200, comprise:
Indentation line generation unit 221, for carrying out indentation to described planar polygons, to generate indentation line.
New polygon generation unit 222, for being connected with indentation line by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race.
Sub-polygon generation unit 223, for the new polygon comprising identical material information is carried out boolean's union, merges the multiple new polygon with the line segment of adjacent identical material information, to generate described sub-planar polygons.
Particularly, indentation line generation unit 221 concrete employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, generates described indentation line after indentation preset distance.
Number of times is changed in order to reduce shower nozzle, as shown in figure 26,3D print system also comprises: grouped element 400, for the sub-planar polygons comprising identical material information is divided into one group, forming some groups of sub-planar polygons, printing the sub-planar polygons of same layer when printing by group.
Print control unit, specifically for after having printed the sub-planar polygons of one deck, first prints the sub-planar polygons with material identical with the material that current shower nozzle sprays when printing lower one deck.So further minimizing shower nozzle changes number of times.
In order to make by the 3D model smooth outer surface printed, as shown in figure 27,3D print system also comprises: selection unit 500, and for when printing described sub-planar polygons, the starting point and ending point of selection shower nozzle is the point in described sub-planar polygons.Preferably, described starting point and ending point is specifically elected as first point in described sub-planar polygons by selection unit.
Should be understood that, above-mentioned detailed description of the invention of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (24)
1. a 3D Method of printing, is characterized in that, comprising:
The threedimensional model to be printed recording material information is converted to multilayer two-dimension polygon, and makes each planar polygons comprise described material information;
Being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, making each described sub-planar polygons only comprise a kind of material information;
Control multiple shower nozzle and print described sub-planar polygons with the material information that often a sub-planar polygons comprises one by one by layer.
2. 3D Method of printing according to claim 1, is characterized in that, material information described in the triangular facet record adopting described threedimensional model surface, and adopts the material information that the line segment on the limit of described planar polygons comprises to record this planar polygons.
3. 3D Method of printing according to claim 2, is characterized in that, the step described planar polygons being divided into some sub-planar polygons comprises:
Generate the axis of described planar polygons;
Be connected with axis by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
The new polygon comprising identical material information is carried out boolean's union, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.
4. 3D Method of printing according to claim 3, is characterized in that, the step generating the axis of described planar polygons comprises:
Adopt Delaunay method to carry out triangulation to described planar polygons, make the limit of some subdivision lines and described planar polygons generate triangular mesh;
The axis of planar polygons described in the middle dot generation connecting subdivision line described in each.
5. 3D Method of printing according to claim 3, is characterized in that, the step generating the axis of described planar polygons comprises: adopt Voronoi figure to generate the axis of described planar polygons.
6. 3D Method of printing according to claim 3, is characterized in that, the step generating the axis of described planar polygons comprises:
Employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, for convex planar polygons, after two angular bisectors intersect generation intersection point, described two angular bisectors are merged, form a new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis; Or for recessed planar polygons, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis.
7. 3D Method of printing according to claim 2, is characterized in that, the step described planar polygons being divided into some sub-planar polygons comprises:
Indentation is carried out to described planar polygons, to generate indentation line;
Be connected with indentation line by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
The new polygon comprising identical material information is carried out boolean's union, merges the multiple new polygon with the line segment of adjacent identical material information, to generate described sub-planar polygons.
8. 3D Method of printing according to claim 7, it is characterized in that, indentation is carried out to described planar polygons, comprise with the step generating indentation line: employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, generates described indentation line after indentation preset distance.
9. 3D Method of printing according to claim 1, it is characterized in that, after the described sub-planar polygons of formation, before printing described sub-planar polygons, also comprise: the sub-planar polygons comprising identical material information is divided into one group, forming some groups of sub-planar polygons, printing the described sub-planar polygons of same layer when printing by group.
10. 3D Method of printing according to claim 1, is characterized in that, after having printed the sub-planar polygons of one deck, first prints the sub-planar polygons with material identical with the material that current shower nozzle sprays when printing lower one deck.
11. 3D Method of printings according to any one of claim 1 ~ 10, is characterized in that, when printing described sub-planar polygons, select the starting point and ending point of shower nozzle to be point in described sub-planar polygons.
12. 3D Method of printings according to claim 11, is characterized in that, described starting point and ending point is first point in described sub-planar polygons.
13. 1 kinds of 3D print systems, is characterized in that, comprising:
Model conversion unit, for the threedimensional model to be printed recording material information is converted to multilayer two-dimension polygon, and makes each planar polygons comprise described material information;
Polygon dividing unit, for being divided into some sub-planar polygons by comprising various material information planar polygons in every layer, makes each described sub-planar polygons only comprise a kind of material information; With
Print control unit, the material information comprised with every sub-planar polygons for controlling multiple shower nozzle prints described sub-planar polygons one by one by layer.
14. 3D print systems according to claim 13, is characterized in that, material information described in the triangular facet record adopting described threedimensional model surface, and adopt the material information that the line segment on the limit of described planar polygons comprises to record this planar polygons.
15. 3D print systems according to claim 14, it is characterized in that, described polygon dividing unit comprises:
Axis generation unit, for generating the axis of described planar polygons;
New polygon generation unit, for being connected with axis by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
Sub-polygon generation unit, for the new polygon comprising identical material information is carried out boolean's union, merges the line segment and the multiple new polygon on shared at least one limit with adjacent identical material information, to generate described sub-planar polygons.
16. 3D print systems according to claim 15, is characterized in that, described axis generation unit comprises:
Triangulation unit, for adopting Delaunay method to carry out triangulation to described planar polygons, makes the limit of some subdivision lines and described planar polygons generate triangular mesh;
Subdivision line linkage unit, for connecting the axis of planar polygons described in dot generation in subdivision line described in each.
17. 3D print systems according to claim 15, is characterized in that, described axis generation unit adopts Voronoi figure to generate the axis of described planar polygons.
18. 3D print systems according to claim 15, is characterized in that, described axis generation unit employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, comprising:
For convex planar polygons, after two angular bisectors intersect generation intersection point, described two angular bisectors are merged, forms a new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis; Or
For recessed planar polygons, after two angle separated times separation are no longer intersected, planar polygons is divided into multiple new polygon, to described new polygon by its angular bisector indentation, until generate polygonal axis.
19. 3D print systems according to claim 14, it is characterized in that, polygon dividing unit comprises:
Indentation line generation unit, for carrying out indentation to described planar polygons, to generate indentation line;
New polygon generation unit, for being connected with indentation line by the line segment comprising material information of the same race, generating some is the minimum new polygon closed of the area on a limit with the line segment comprising described material information of the same race;
Sub-polygon generation unit, for the new polygon comprising identical material information is carried out boolean's union, merges the multiple new polygon with the line segment of adjacent identical material information, to generate described sub-planar polygons.
20. 3D print systems according to claim 19, it is characterized in that, described indentation line generation unit employing Straight Skeleton method carries out indentation along the angular bisector of described planar polygons to described planar polygons, generates described indentation line after indentation preset distance.
21. 3D print systems according to claim 13, it is characterized in that, also comprise: grouped element, for the sub-planar polygons comprising identical material information is divided into one group, forming some groups of sub-planar polygons, printing the described sub-planar polygons of same layer when printing by group.
22. 3D print systems according to claim 13, it is characterized in that, described print control unit, specifically for after having printed the sub-planar polygons of one deck, first prints the sub-planar polygons with material identical with the material that current shower nozzle sprays when printing lower one deck.
23. 3D print systems according to any one of claim 13 ~ 22, is characterized in that, also comprise: selection unit, for when printing described sub-planar polygons, select the starting point and ending point of shower nozzle to be point in described sub-planar polygons.
24. 3D print systems according to claim 23, is characterized in that, described starting point and ending point is specifically elected as first point in described sub-planar polygons by described selection unit.
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| CN201510217429.0A CN104890237B (en) | 2015-04-30 | 2015-04-30 | 3D printing method and system |
| PCT/CN2015/080187 WO2016173063A1 (en) | 2015-04-30 | 2015-05-29 | 3d printing method and system |
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| CN201510217429.0A CN104890237B (en) | 2015-04-30 | 2015-04-30 | 3D printing method and system |
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| WO2016173063A1 (en) | 2016-11-03 |
| CN104890237B (en) | 2017-08-01 |
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