CN113733566B - Contour support structure generation method and device, electronic equipment and storage medium - Google Patents
Contour support structure generation method and device, electronic equipment and storage medium 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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Abstract
The invention belongs to the technical field of 3D printing model preprocessing, and particularly relates to a contour supporting structure generating method, a contour supporting structure generating device, electronic equipment and a storage medium; the method comprises the following steps: loading a 3D model; selecting a target 3D model; selecting a contour distribution instruction module in a support type function menu bar through a human-computer interaction interface; selecting an A point and a height for a contact point of a 3D model equal-height supporting unit through a human-computer interaction interface, and determining to generate a model to support once; the human-computer interaction interface is displayed on the same height of the surface of the 3D model, a group of a plurality of equal-height supporting units are uniformly distributed and generated, and the equal-height supporting units are connected between the 3D model and the zero-plane platform; and storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in a storage unit. The method can generate a group of a plurality of equal-height supporting units which are uniformly distributed at equal heights through one-time operation; adding the support structure is more efficient.
Description
Technical Field
The invention belongs to the technical field of 3D printing model preprocessing, and particularly relates to a contour supporting structure generating method, a contour supporting structure generating device, electronic equipment and a storage medium.
Background
The Three-dimensional (3D) printing technology is a novel rapid prototyping technology based on a digital model, and the model is manufactured by a layer-by-layer printing mode, which is a totally different prototyping technology from the traditional mould production and manufacturing. At present, in the existing photocuring 3D printing technology, 3D preprocessing software is generally adopted to perform model preprocessing on a 3D model formed by splicing triangular grids generated by industrial design software such as SOLIWORKS and the like, and then photocuring 3D printing is performed according to generated slice data. The 3D printing processing process is that the digital model is divided into a plurality of layer slices according to the designated layer height, printing is carried out from the lower layer to the higher layer and the upper layer, each layer is overlapped on the basis of the previous layer, if the previous layer of the current layer is empty, the current layer cannot be supported, and the printing at the position fails. Therefore, a contour supporting unit needs to be added to the suspended position of the model so that the model body is supported.
In the prior art, a single support can be manually added at a time, and a plurality of supports can be automatically added for the whole model at a time. However, the mode of manually adding a single support for a single time is too slow, the workload is large, and the efficiency is too low; when a plurality of supports are automatically added for the whole model at a time, as the thickness and the size parameters of the batch support units are consistent, if thicker support columns are adopted, the support columns are not easy to shear, and the difficulty of removing the supports after printing can be increased; if all the thinner support columns are adopted, the printed support columns are easy to shear, but when the support columns at the gravity center position of the model are too thin in the printing process, the model is easy to break after demoulding when LCD photo-curing printing is carried out, so that printing failure is caused; therefore, the special requirements of the special model cannot be met; all modes of manually adding the model support and all automatically adding the model support have disadvantages; there is also a need to provide other methods of locally mass adding contour support units to combine with manually adding model supports to account for the need to set a specific model support for a particular location and to increase efficiency.
Disclosure of Invention
Aiming at the situation in the background technology, a group of a plurality of equal-height supporting units which are uniformly distributed at the same height position of the 3D model are generated through one-time operation, so that the batch addition of the local equal-height supporting units at the equal-height position is realized, and the parameters of each group of equal-height supporting units can be set as the same parameters or can be set as different parameters. And the side parts or the bottom parts of the model are uniformly selected to be at different heights, equal-height support is repeatedly carried out, and the fully distributed support units can be rapidly generated in batches on all the support buried points, so that the effect of automatically adding and fully distributing a plurality of supports at one time is achieved. The technical scheme adopted by the invention is as follows:
according to a first aspect of the present invention, there are provided two methods of generating a contour support structure, wherein,
method 1, a contour support structure generation method, based on the operation execution process of a computer, comprising the following steps:
the computer runs 3D printing model preprocessing software and loads a 3D model;
selecting a target 3D model through a 3D printing model preprocessing software man-machine interaction interface operated by a computer;
selecting a contour distribution instruction module in a support type function menu bar through a man-machine interaction interface;
selecting an A point and a height for a contact point of a 3D model equal-height supporting unit through a human-computer interaction interface, and determining to generate a model to support once;
The human-computer interaction interface is displayed on the same height of the surface of the 3D model, a group of a plurality of equal-height supporting units are uniformly distributed and generated, and the equal-height supporting units are connected between the 3D model and the zero-plane platform;
and storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in a storage unit.
In the method, preferably, the multi-point height is selected through repeated operation and the generation of the equal-height supporting units is confirmed to be multiple times, and a plurality of groups of equal-height supporting units which are uniformly distributed are respectively generated on the surface of the 3D model; the parameters of the equal-height supporting units among different groups of the equal-height supporting units comprise one group of same parameters or multiple groups of different parameters.
Method 2, a contour support structure generation method, for illustrating a contour support unit generation process, comprising the steps of:
acquiring a triangular mesh model of the 3D model;
selecting a 3D model;
traversing and splicing all triangular grids forming a 3D model;
selecting an A point on a triangular mesh plane of the 3D model;
taking a cross-section plane perpendicular to the Z axis through the point A;
intersecting the cross section plane with all triangular grids to obtain a section line segment intersecting with the triangular grids and line segment endpoints;
the slicing line segments of the intersecting triangular meshes are sequentially connected end to form a closed polygon;
Segmenting each side of the closed polygon by taking Y millimeters as a unit to obtain points, and obtaining all segmentation points and endpoints and points A as a first set of sampling points;
designating a clock direction, taking the point A as an initial anchoring extraction point, sequentially extracting sampling points with the linear distance of L+DeltaX mm from all sampling points in the first set, and taking all sampling points as an extraction point second set;
taking all the extraction points in the second set as contact points of the contour supporting units, and leading out a plurality of contour supporting units downwards to be connected between the 3D model and the zero-plane platform;
and storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in a storage unit.
In the method, preferably, the L is a positive integer or a decimal; y is also a positive integer or decimal; the ΔX is an error value less than Y.
In the method, preferably, the clock direction includes a counterclockwise direction or a clockwise direction; the number of closed polygons is one or more.
In the method 1 or 2, preferably, the contour supporting unit includes: support center pillar, support folding pillar, folding pillar contact point; the folding column contact point is arranged at the tail end of the supporting folding column and is in contact connection with the surface of the 3D model; the root of the supporting folding column is connected to the top end of the supporting middle column; the bottom end of the supporting center column is connected with the zero plane platform; the shape of the supporting middle column and the supporting folding column is conical, or conical column, or cylindrical, or square column, or prismatic.
In the method 1 or 2, preferably, the contour supporting unit includes: support center pillar, support folding pillar, folding pillar contact point, bottom support platform and/or truss; the folding column contact point is arranged at the tail end of the supporting folding column and is in contact connection with the surface of the 3D model; the root of the supporting folding column is connected to the top end of the supporting middle column; the bottom end of the supporting center column is connected with a bottom supporting platform or a zero plane platform; the bottom supporting platform is connected with the zero plane platform; the trusses are connected between adjacent support center posts; the shape of the supporting center column, the supporting folding column and the truss is conical, or cylindrical, or square, or prismatic; the shape of the bottom supporting platform is flat square, or flat diamond, or flat round, or flat polygon.
According to a second aspect of the present invention, there are provided two kinds of contour support structure generating apparatus, wherein,
apparatus 1, a contour support structure generation apparatus, comprising:
the first model acquisition unit is used for loading the 3D model;
a first model determination unit for selecting a 3D model;
the function selection unit is used for selecting the contour distribution instruction module;
The contact point selection unit is used for selecting an A point and a height and determining that the generated model is supported once;
the support unit generates a display unit which is used for uniformly distributing and generating a group of a plurality of equal-height support units on the same height of the surface of the 3D model, and the equal-height support units are connected between the 3D model and the zero-plane platform;
and the storage unit is used for storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in the storage unit.
Apparatus 2, a contour support structure generation apparatus, comprising:
a second model acquisition unit for acquiring a triangular mesh model of the 3D model;
a second model determination unit for selecting a 3D model;
the triangular grid acquisition unit is used for traversing and splicing all triangular grids forming the 3D model;
the grid plane point selection unit is used for selecting an A point on a triangular grid plane of the 3D model;
a cross-section plane determining unit for taking a cross-section plane perpendicular to the Z axis beyond the A point;
the slice line segment determining unit is used for intersecting the cross section plane with all triangular grids to obtain a slice line segment and a line segment endpoint which intersect with the triangular grids;
the closed polygon determining unit is used for sequentially connecting the slicing line segments of the intersected triangular meshes end to form a closed polygon;
The sampling point set acquisition unit is used for sectionally taking points on each side of the closed polygon by taking Y millimeters as a unit and acquiring all sectional points and end points and the point A as a first set of sampling points;
the extraction point set acquisition unit is used for designating sampling points with the linear distance of L+DeltaX millimeters for all sampling points in the first set in a clock direction by taking the point A as an initial anchoring extraction point pair and taking all the sampling points as an extraction point second set;
the support unit generation unit is used for taking all the extraction points in the second set as equal-height support unit contact points and leading out a plurality of equal-height support units downwards to be connected between the 3D model and the zero-plane platform;
and the storage unit is used for storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in the storage unit.
According to a third aspect of the present invention, there is provided an electronic device comprising:
at least one processor; and
a memory unit in communication with the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the storage unit stores instructions executable by the at least one processor to enable the at least one processor to perform the contour support structure generation method as described in method 2.
According to a fourth aspect of the present invention there is provided a non-transitory computer readable storage medium storing a computer program which when executed by a processor implements the steps of the contour support structure generation method as described in method 2.
According to a fifth aspect of the present invention there is provided a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the contour support structure generation method as described in method 2.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for generating the equal-height supporting structure provided by the method 1 can facilitate a user to generate a group of equal-height uniformly distributed equal-height supporting units at the same height position of the 3D model through one-time operation, and realize batch addition of local equal-height supporting units at the equal-height position, so that the operation of adding the equal-height supporting units is faster when the 3D model is preprocessed, thereby reducing the workload and improving the efficiency.
2. According to the method for generating the equal-height supporting structure, provided by the method 1, the multiple groups of equal-height supporting units which are uniformly distributed can be respectively generated on the surface of the 3D model by repeatedly operating the selected multiple points and determining to generate the equal-height supporting units, and the rapid effect similar to that of automatically adding the multiple equal-height supporting units to the whole model at one time can be achieved by relatively uniformly selecting the different points.
3. According to the method 1 provided by the invention, when the parameters of the equal-height supporting units among different groups of the equal-height supporting units adopt different groups of parameters, the parameters such as different diameters, shapes and the like can be set for different special positions of the 3D model so as to adapt to the requirement of reinforcing support of the special positions of the 3D model.
4. The method 2 provided by the invention provides a practical program execution method; taking points from each side of the closed polygon in a segmentation way by taking Y millimeters as a unit, and acquiring all segmentation points and endpoints and points A as a first set of sampling points; the sampling density can be controlled by regulating the size of Y millimeters, and when X is smaller and the sampling points are denser, the sampling points with the linear distance of L+DeltaX millimeters are extracted in pairs in the next step
A higher degree of uniformity can be achieved.
5. The method 2 provided by the invention provides a practical program execution method; taking points from each side of the closed polygon in a segmentation way by taking Y millimeters as a unit, and acquiring all segmentation points and endpoints and points A as a first set of sampling points; then designating a clock direction to anchor the sampling points in the first set by taking the point A as the initial anchoring extraction point, extracting sampling points with the linear distance of L+DeltaX mm from each other in sequence, and taking all the sampling points as the second set of extraction points; the degree of density of contact points of the contour supporting units and the number of the contour supporting units can be controlled by regulating the value of L, when Y is larger and the value of L is also larger, the operation amount of a CPU of a computer can be reduced due to the reduction of the number of sampling points, and the speed and the response speed of adding and generating the contour supporting units when the computer runs 3D printing model preprocessing software are improved.
Drawings
FIG. 1 is a flow chart of a method 1 for generating a contour support structure according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method 2 for generating a contour support structure according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a triangular mesh of a 3D model according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing an intersecting perspective view of a triangular mesh of a 3D model and a cross-sectional plane according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cross-sectional plane and a triangular mesh of a 3D model according to an embodiment of the present invention;
FIG. 6 is a schematic view of a closed polygon of slice segments according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a closed polygon edge segment fetch point according to an embodiment of the present invention;
FIG. 8 is a schematic diagram 1 of a sampling point uniform distance extraction according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a sampling point uniform distance extraction 2 according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an embodiment of the present invention in which extracted points are mapped from a two-dimensional coordinate system to a three-dimensional coordinate system;
FIG. 11 is a schematic diagram 1 illustrating the generation of a contour supporting unit according to an embodiment of the present invention;
FIG. 12 is a schematic diagram 2 illustrating the generation of a contour supporting unit according to an embodiment of the present invention;
FIG. 13 is a contour support unit generation example 1 of the present invention;
FIG. 14 is a contour support unit generation example 2 of the present invention;
FIG. 15 is a contour support unit generation example 3 of the present invention;
FIG. 16 is a contour support unit generation example 4 of the present invention;
fig. 17 is a structural view of a contour support structure generating apparatus 1 according to an embodiment of the present invention;
fig. 18 is a block diagram of the contour support structure generation apparatus 2 according to the embodiment of the present invention;
FIG. 19 is a block diagram 1 of an electronic device for implementing a method for generating a contour support structure according to an embodiment of the present invention;
FIG. 20 is a block diagram 2 of an electronic device for implementing a method for generating a contour support structure in accordance with an embodiment of the present invention;
FIG. 21 is a subsequent manufacturing flow chart 1 of the method 1 for generating a contour support structure according to the embodiment of the present invention;
fig. 22 is a subsequent manufacturing flow chart of the method 1 for generating the equal-height support structure according to the embodiment of the invention.
Description of the reference numerals:
a triangular mesh model 1; closing the polygon 10; a triangular mesh 11; point a 12; an end point 13; a slice segment 14; a segmentation point 15; extracting points 16; a cross-sectional plane 20; a contour supporting unit 30; a 3D model 100; support the center pillar 301; support folding column 302; a folding column contact point 303; a bottom support platform 304; concealing contour 305; truss 306; a zero plane platform 40; a first model acquisition unit 501; a first model determination unit 502; a function selecting unit 503; a contact point selection unit 504; the support unit generates a display unit 505; a storage unit 506; a second model acquisition unit 601; a second model determination unit 602; a triangular mesh acquisition unit 603; grid plane setpoint unit 604; a cross-section plane determination unit 605; a slice segment determination unit 606; a closed polygon determination unit 607; a sampling point set acquisition unit 608; an extraction point set acquisition unit 609; a support unit generation unit 610; an electronic device 70; a processor 701; a computer program 702; a bus 703; an input unit 704; an output unit 705; a removable storage device 71; a 3D printing device 72; printing a model 73; a mouse 7041; a keyboard 7042.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Fig. 1 is a flowchart of a method 1 for generating a contour support structure according to an embodiment of the present invention. As shown, a computer-based operation performs a process comprising the steps of:
s01, running 3D printing model preprocessing software by a computer and loading a 3D model;
s02, selecting a target 3D model through a 3D printing model preprocessing software man-machine interaction interface operated by a computer;
s03, selecting a contour distribution instruction module in a support type function menu bar through a man-machine interaction interface of the control system;
s04, selecting an A point and a height for a contact point of a 3D model equal-height supporting unit through a man-machine interaction interface, and determining to generate a model to support once;
s05, displaying a human-computer interaction interface, wherein a group of a plurality of equal-height supporting units are uniformly distributed on the same height of the surface of the 3D model and are connected between the 3D model and the zero-plane platform;
S06, storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in a storage unit.
In addition, the manufacturing based on the subsequent slicing and 3D printing further comprises the following steps:
s07, slicing the whole three-dimensional data and storing the whole three-dimensional slice data in a computer storage unit;
and S08, importing the whole three-dimensional slice data into a 3D printing device through a movable storage device to perform additive printing manufacturing.
In the step S04 of the method, a plurality of groups of uniformly distributed equal-height supporting units are respectively generated on the surface of the 3D model through repeatedly operating selected multi-point heights and determining to generate the equal-height supporting units for a plurality of times; the parameters of the equal-height supporting units among different groups of the equal-height supporting units comprise one group of same parameters or multiple groups of different parameters.
Fig. 2 is a flowchart of a method 2 for generating a contour support structure according to an embodiment of the present invention. As shown, the generation process of the contour supporting unit is described, which includes the following steps:
SS01, acquiring a triangular mesh model of the 3D model;
SS02, selecting a 3D model;
SS03, traversing and splicing all triangular grids forming a 3D model;
SS04, selecting an A point on a triangular mesh plane of the 3D model;
SS05, taking a cross-sectional plane perpendicular to the Z axis through the point a;
SS06, intersecting the cross-section plane with all triangular grids, and calculating to obtain a section line segment intersecting with the triangular grids and line segment endpoints;
SS07, sequentially connecting the slicing line segments of the intersecting triangle mesh end to form a closed polygon;
SS08, taking points from each side of the closed polygon in segments with Y millimeters as a unit and obtaining all the segment points and endpoints and points a as a first set of sampling points;
SS09, designating a clock direction, using point a as initial anchoring extraction point, extracting sampling points with linear distance l+Δx mm from all sampling points in the first set in pairs sequentially, and using all sampling points as extraction point second set;
SS10, taking all the extraction points in the second set as contact points of the contour supporting units, and leading out a plurality of contour supporting units downwards to connect between the 3D model and the zero-plane platform;
SS11, storing the 3D model and the whole three-dimensional data of the plurality of contour support units in a storage unit.
In the method steps S08 and S09, L is a positive integer or decimal, and Y is also a positive integer or decimal; the ΔX is an error value less than Y.
Fig. 3 is a schematic perspective view of a triangular mesh of a 3D model according to an embodiment of the present invention. As shown in the figure, after the computer runs the 3D printing model preprocessing software and loads the 3D model; a triangular mesh model 1 of the 3D model can be obtained; the surface of the whole 3D model is approximately formed by a triangular mesh 11; in method 1, a user randomly selects an A point 12 on the surface of a 3D model by using a mouse; then one a point 12 is selected at the plane of the triangular mesh 11 of the 3D model, corresponding to step SS04 in method 2. Specifically, in actual operation, a projection point of the coordinate position of the mouse on the screen projected on the plane of the triangular mesh 11 on the man-machine interaction interface is the point a 12.
Fig. 4 is a schematic diagram illustrating an intersecting perspective view of a triangular mesh and a cross-sectional plane of a 3D model according to an embodiment of the present invention. As shown, corresponding to step SS05 of method 2, cross-section plane 20 perpendicular to the Z-axis is taken through point a 12; the cross-sectional plane 20 in the figure intersects all triangular meshes 11 to obtain a series of slice line segments 14 and end points 13 of the slice line segments on the cross-sectional plane 20.
FIG. 5 is a schematic diagram of a cross-sectional top view of a triangular mesh of a 3D model according to an embodiment of the present invention. As shown, the cross-section plane 20 perpendicular to the Z-axis is taken through point a 12, corresponding to step SS05 of method 2, as in fig. 4; the cross-sectional plane 20 in the figure intersects all triangular meshes 11 to obtain a series of slice line segments 14 and end points 13 of the slice line segments on the cross-sectional plane 20.
Fig. 6 is a schematic diagram of a closed polygon of slice segments according to an embodiment of the present invention. As shown, the cross-sectional plane 20 in fig. 4 and 5 intersects all triangular meshes 11, each triangular mesh having a slicing line segment 14 and an end point 13 of the slicing line segment; corresponding to step SS07 of method 2, the slicing line segments 14 of each triangular mesh 11 are sequentially connected end to form a closed polygon 10; the position of the point a 12 in the figure falls in the middle of a slice segment 14 because the point of the point a 12 in fig. 3 falls in the middle of the plane of the triangular mesh 11.
FIG. 7 is a schematic diagram of a closed polygon with segmented fetching of each side of the polygon according to an embodiment of the present invention. As shown, the method 2 is characterized in that the sides of the closed polygon 10 are segmented and sampled in units of Y millimeters to obtain points 15 and 13 containing all segments, adding the points 12 to the points a, and taking the sampled points as a first set; the reason for adding the point a 12 is that the subsequent contour supporting units 30 will be uniformly arranged clockwise or counterclockwise with the point a as the initial contact point.
Fig. 8 is a schematic diagram 1 of sampling point uniform distance extraction according to an embodiment of the present invention. As shown in the figure, corresponding to step SS09 in method 2, a clock direction is designated to anchor the sampling points in the first set with the point a as the start point, and the sampling points with the straight line distance l+Δx mm are sequentially extracted from each other and the sampling points are used as the second set of the sampling points; in the figure, starting from the anticlockwise direction, sequentially measuring the distance between the point A and each subsequent sampling point from the point A, and when the distance between a certain sampling point and the point A is measured to be smaller than L millimeters, the point is not an extraction point; when the distance between a certain sampling point and the point A is measured in sequence to be more than or equal to L millimeters, the point is an extraction point; then starting with the extraction point, sequentially measuring the distance between the change point and each subsequent sampling point, and when the distance between a certain sampling point and the point is measured to be smaller than L millimeters, determining that the point is not the extraction point; when the distance between a certain sampling point and the point is measured in sequence to be more than or equal to L millimeters, the point is an extraction point; and analogizing is performed sequentially until all the extraction points are obtained; in step SS09, the case of l+Δx mm is that when the end of the L length is just between two sampling points, the sampling point needs to be obtained as the sampling point, so Δx is an error value smaller than Y for the sampling point correction. This ensures that the subsequent equal-height support units 30 are relatively more evenly spaced from each other.
Fig. 9 is a schematic diagram of sampling point uniform distance extraction according to an embodiment of the invention. As shown, the present figure omits the fine segmentation points 15 relative to FIG. 8, so the overall schematic is more compact. The circled points in the figure are the locations of the extraction points 16, all as a second set, which will be the points of contact of the contour support unit 30 with the model surface.
Fig. 10 is a schematic diagram of a two-dimensional coordinate system to a three-dimensional coordinate system of an extracted point according to an embodiment of the present invention. As shown, the extraction points circled by each circle in the closed polygon 10 in the XY two-dimensional coordinate system correspond to the XYZ three-dimensional coordinate system, and the extraction points 16 are uniformly distributed on the same hidden contour 305.
Fig. 11 is a schematic diagram 1 illustrating the generation of a contour supporting unit according to an embodiment of the present invention. As shown in the figure, applying method 1 or method 2 to the 3D model 100, after taking a point a 12 on the surface of the 3D model 100, combining the processes of fig. 3 to 10, 9 extraction points 16 that are uniformly distributed on the surface of the 3D model 100 can be finally obtained, and the 9 extraction points 16 are located on the same hidden contour 305; these 9 extraction points 16 are also at the same time the contour support unit contact points described in step SS10 of method 2; in the figure, the extraction point 16 and the folding column contact point 303 are positioned at the same position;
On this basis, corresponding to step SS10 in method 2, the 9 extraction points 16 are connected between the 3D model 100 and the zero-plane platform 40 as contour support unit contact points and a plurality of contour support units 30 are led out downwards; in the present drawing, the contour support unit 30 includes: support center post 301, support fold post 302, fold post contact point 303; the folding column contact point 303 is arranged at the tail end of the supporting folding column 302 and is in contact connection with the surface of the 3D model 100; the root of the supporting folding column 302 is connected to the top end of the supporting middle column 301; the bottom end of the supporting center pillar 301 is connected to the zero-plane platform 40; the shape of the supporting middle column 301 and the supporting folding column 302 can be conical, or cylindrical, or square, or prismatic, in the figure, the supporting middle column 301 is cylindrical, and the supporting folding column 302 is conical;
corresponding to step S05 of method 1, the human-computer interaction interface is shown as a group of 9 contour supporting units 30 are uniformly distributed and generated on the same height of the surface of the 3D model 100, i.e. on the same hidden contour 305, and are connected between the 3D model 100 and the zero-plane platform 40.
Fig. 12 is a schematic diagram 2 illustrating the generation of the equal-height supporting unit according to the embodiment of the present invention. As shown, on the basis of fig. 11. Each of the contour support units 30 of the present figure has a bottom support platform 304 added thereto; the bottom end of the supporting center pillar 301 is connected to the bottom supporting platform 304; the bottom support platform 304 is connected to the zero plane platform 40; in the figure, the supporting center column 301 is cylindrical, and the supporting folding column 302 is conical; the shape of the bottom supporting platform can be a flat square, a flat diamond, a flat round or a flat polygon; the bottom support platform 40 is shown in this figure as a flat square.
Fig. 13 is a contour support unit generation example 1 of the present invention. As shown in the figure, taking a 3D model 100 in the shape of a bat as an example, a plurality of folding column contact points 303 are uniformly distributed on a hidden contour 305 in the example; correspondingly, a plurality of equal-height supporting units 30 are led downwards from the folding column contact points 303 and are connected between the upper sphere of the 3D model 100 and the zero-plane platform 40; wherein each of the contour supporting units 30 includes: support center post 301, support fold post 302, fold post contact point 303, bottom support platform 304; the folding column contact point 303 is arranged at the tail end of the supporting folding column 302 and is in contact connection with the surface of the 3D model 100; the root of the supporting folding column 302 is connected to the top end of the supporting middle column 301; the bottom end of the supporting center pillar 301 is connected to the bottom supporting platform 304; the bottom support platform 304 is connected to the zero plane platform 40; the overlapping positions of the bottom support platforms 304 are combined into a whole in the figure, which is beneficial to enhancing the adhesiveness between the whole model support structure and the 3D printer forming platform and preventing the model from falling off in the 3D printing link. Specifically, the included angle between the supporting folding column 302 and the supporting middle column 301 may be any angle, but in general practical use, when the included angle is smaller than 90 degrees, the printing failure condition easily occurs in the 3D printing link, and if necessary, the included angle between the supporting folding column 302 and the supporting middle column 301 may be 180 degrees, where the equal-height supporting unit 30 is generally supported at the lowest point of the 3D model.
Fig. 14 is a contour support unit generation example 2 of the present invention. As shown in the figure, on the basis of fig. 13, a truss 306 is added between a plurality of equal-height support units 30, and the truss 306 is connected between adjacent support center posts 301; the shape is conical, or conical column, or cylindrical, or square column, or prismatic; the truss 306 is used for enhancing the lateral stability of the support center column 301, so that a plurality of equal-height support units 30 are transversely connected into a whole, the stability of the whole model support structure is enhanced, and the failure of printing of the whole model caused by the breakage of a single support column in a 3D printing link is prevented. The truss 306 in this figure uses two cylinders crisscrossed to enhance the strength of the connection between the post-printing model support struts 301.
Fig. 15 is a contour support unit generation example 3 of the present invention. As shown in the figure, taking a 3D model 100 with a square recess shape as an example, a plurality of folding column contact points 303 are uniformly distributed on a hidden contour 305 in the example; correspondingly, a plurality of equal-height supporting units 30 are led downwards from the folding column contact points 303 and are connected between the upper sphere of the 3D model 100 and the zero-plane platform 40; wherein each of the contour supporting units 30 includes: support center post 301, support fold post 302, fold post contact point 303, bottom support platform 304; the folding column contact point 303 is arranged at the tail end of the supporting folding column 302 and is in contact connection with the surface of the 3D model 100; the root of the supporting folding column 302 is connected to the top end of the supporting middle column 301; the bottom end of the supporting center pillar 301 is connected to the bottom supporting platform 304; the bottom support platform 304 is connected to the zero plane platform 40; the overlapping positions of the bottom support platforms 304 are combined into a whole in the figure, which is beneficial to enhancing the adhesiveness between the whole model support structure and the 3D printer forming platform and preventing the model from falling off in the 3D printing link.
The feature of this figure compared to fig. 13 is that this figure has two sets of hidden contours 305 at the same height at the lower position of the 3D model 100; this is because the cross-section plane 20 cross-sections the model yields two closed polygons; thus, in connection with the method 2 of the present invention, it is known that when the 3D model 100 has a plurality of branching features, the number of closed polygons is a plurality when a plurality of independent closed plane figures are obtained after the cross-sectional plane 20 intersects the 3D model 100.
In particular, in this embodiment, since two closed polygons are generated when the cross-section plane cross-conceals the position of the contour 305 according to method 2, and the point a falls on only one of the closed polygons, the initial anchor extraction point is not specified on the other closed polygon, so that a random segmentation point or endpoint on the closed polygon can be specified as the initial anchor extraction point, or the segmentation point or endpoint farthest or nearest from the point a on the closed polygon can be specified as the initial anchor extraction point, and the contour support unit contact point is obtained by combining the method of step SS09 in method 2.
Fig. 16 is a contour support unit generation example 4 of the present invention. As shown in the figure, on the basis of fig. 15, a truss 306 is added between a plurality of equal-height support units 30, and the truss 306 is connected between adjacent support center posts 301; the shape is conical, or conical column, or cylindrical, or square column, or prismatic; the truss 306 is used for enhancing the lateral stability of the support center column 301, so that a plurality of equal-height support units 30 are transversely connected into a whole, the stability of the whole model support structure is enhanced, and the failure of printing of the whole model caused by the breakage of a single support column in a 3D printing link is prevented.
Fig. 17 is a structural diagram of the equal-height support structure generating apparatus 1 according to the embodiment of the present invention. As shown in the figure, an embodiment of the present invention provides a device for generating a contour support structure, including:
a first model obtaining unit 501, configured to load a 3D model;
a first model determining unit 502 for selecting a 3D model;
a function selecting unit 503, configured to select a contour distribution instruction module;
a contact point selection unit 504 for selecting a point a and a height and determining a generated model support once;
the support unit generating display unit 505 is configured to uniformly distribute and generate a group of multiple equal-height support units on the same height on the surface of the 3D model, where the multiple equal-height support units are connected between the 3D model and the zero-plane platform;
and a storage unit 506, configured to store the 3D model and the overall three-dimensional data of the plurality of contour support units in the storage unit.
Fig. 18 is a block diagram of the contour support structure generating apparatus 2 according to the embodiment of the present invention. As shown in the figure, an embodiment of the present invention provides a device for generating a contour support structure, including:
a second model obtaining unit 601, configured to obtain a triangular mesh model of the 3D model;
a second model determining unit 602, configured to select a 3D model;
a triangular mesh obtaining unit 603, configured to traverse and splice all triangular meshes that form the 3D model;
A grid plane point selection unit 604, configured to select an a point on a triangle grid plane of the 3D model;
a cross-section plane determining unit 605 for taking a cross-section plane perpendicular to the Z-axis beyond the point a;
a slice line segment determining unit 606, configured to calculate intersection of the cross-section plane and all triangular meshes to obtain a slice line segment and a line segment endpoint intersecting the triangular meshes;
a closed polygon determining unit 607, configured to sequentially end-to-end connect the slice line segments of the intersection triangular mesh to form a closed polygon;
a sampling point set obtaining unit 608, configured to segment each side of the closed polygon by Y millimeters to obtain points and obtain all segment points and end points and a points as a first set of sampling points;
an extraction point set obtaining unit 609, configured to designate a clock direction, anchor the extraction points with point a as a start, sequentially extract sampling points with linear distance l+Δx mm from all sampling points in the first set, and use all sampling points as the second set of extraction points;
the supporting unit generating unit 610 is configured to connect all the extraction points in the second set between the 3D model and the zero-plane platform by using all the extraction points as contact points of the equal-height supporting units and leading out a plurality of equal-height supporting units downwards;
And a storage unit 506, configured to store the 3D model and the overall three-dimensional data of the plurality of contour support units in the storage unit.
Fig. 19 is a block diagram 1 of an electronic device for implementing a method for generating a contour support structure according to an embodiment of the present invention. As shown, an electronic device 70 includes a processor 701 and a memory unit 506; the storage unit 506 stores instructions executable by the processor 701, where the instructions are executed by the processor 701, so that the processor 701 can perform the method for generating a contour support structure according to the method 2 of the present invention.
Fig. 20 is a block diagram 2 of an electronic device for implementing the method for generating a contour support structure according to an embodiment of the present invention. The electronic device 70 is illustrated as a processor 701. As shown, an electronic device 70 includes: a storage unit 506, a processor 701, a bus 703, an input unit 704, an output unit 705, and interfaces for connecting the respective components, including a high-speed interface and a low-speed interface. The various components are interconnected by a bus 703 and may be mounted on a common motherboard or in other manners as desired. The processor 703 may process instructions executing within the electronic device, including instructions stored in the storage unit 506 or displaying graphical information of a GUI on an external output unit 705 (such as a display device coupled to an interface); including instruction input devices such as a mouse, keyboard, touch screen, etc., coupled to an interface, stored in the storage unit 506 or with an external input unit 704. In other embodiments, multiple processors 701 and/or multiple buses 703 may be used, if desired, along with multiple memory units 506. Also, a plurality of electronic devices 70 may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system).
The storage unit 506 is a fourth aspect of the present invention, and provides a non-transitory computer readable storage medium. Wherein the storage unit 506 stores instructions executable by at least one processor to cause the at least one processor to perform the method for generating a contour support structure provided by the method 2 of the present invention. The non-transitory, non-transitory computer readable storage medium of the present invention stores computer instructions for causing a computer to execute the contour support structure generation method provided by the method 2 of the present invention.
The storage unit 506 is a non-transitory computer readable storage medium, and may be used to store a non-transitory software program, a non-transitory computer executable program, and a module, such as program instructions/modules corresponding to the contour support structure generation method in the embodiment of the present invention (for example, the first model acquisition unit 501, the first model determination unit 502, the function selection unit 503, and the contact point selection unit 504 shown in fig. 17; the second model acquisition unit 601, the second model determination unit 602, and the grid plane selection unit 604 shown in fig. 18). The processor 701 executes various functional applications of the server and data processing by executing non-transitory software programs, instructions, and modules stored in the storage unit 506, that is, implements the contour support structure generation method in the embodiment corresponding to fig. 2 described above.
The storage unit 506 may include a storage program area that may store an operating system, at least one application program required for a function, and a storage data area; the storage data area may store data created from the use of the electronic device generated by the support structure, and the like. In addition, the storage unit 506 may include a high-speed random access storage unit, and may further include a non-transitory storage unit, such as at least one magnetic disk storage unit, a flash memory device, or other non-transitory solid-state storage unit. In some embodiments, storage unit 506 optionally includes storage units located remotely from processor 701, which may be connected to the support structure-generated electronic device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input unit 704 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic device generated by the support structure, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, a pointer stick, one or more mouse buttons, a track ball, a joystick, and the like.
The output device 705 may include a display device, auxiliary lighting devices (e.g., LEDs), haptic feedback devices (e.g., vibration motors), and the like. The display device may include, but is not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, and a plasma display. In some implementations, the display device may be a touch screen.
In particular, step S02, step S03, step S04 in method 1 of the invention are combined; it is necessary to select a 3D model, or select a contour instruction module, or select an a point through the input unit 704.
Various implementations of the systems and techniques described here can be realized in digital electronic circuitry, integrated circuitry, application specific ASIC (application specific integrated circuit), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input unit, and at least one output device.
These computing programs (also referred to as programs, software applications, or code) include machine instructions for a programmable processor, and may be implemented in a high-level procedural and/or object-oriented programming language, and/or in assembly/machine language. As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus, and/or device (e.g., magnetic discs, optical disks, memory units, programmable Logic Devices (PLDs)) used to provide machine instructions and/or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal used to provide machine instructions and/or data to a programmable processor.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), and the internet.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, provided that the desired results of the disclosed embodiments are achieved, and are not limited herein.
Fig. 21 is a subsequent manufacturing flow chart 1 of the method 1 for generating a contour support structure according to an embodiment of the present invention. As shown in the figure, the electronic device 70 is a computer, and the output device 705 of the electronic device adopts a computer display as a man-machine interaction display interface of the method 1 or 2 of the present invention; the input device 704 uses the mouse 7041 and the keyboard 7042 as the input device for human-computer interaction instructions.
As can be seen from step S07 in fig. 1, the whole three-dimensional data is sliced and stored in the computer storage unit; it is also necessary to import the whole three-dimensional slice data to the 3D printing device 72 for additive printing manufacturing through the removable storage device 71, through step S08. In the figure, the removable storage device 71 mainly stores the whole three-dimensional slice data, and the 3D printing device 72 performs additive printing manufacturing to generate the printing model 73 after importing the whole three-dimensional slice data in the removable storage device 71.
Fig. 22 is a subsequent manufacturing flow chart of the method 1 for generating the equal-height support structure according to the embodiment of the invention. As shown in the figure, the electronic device 70 is a computer, and the output device 705 of the electronic device adopts a computer display as a man-machine interaction display interface of the method 1 or 2 of the present invention; the input device 704 uses the mouse 7041 and the keyboard 7042 as the input device for human-computer interaction instructions.
As can be seen from step S07 in fig. 1, the whole three-dimensional data is sliced and stored in the computer storage unit; it is also necessary to import the whole three-dimensional slice data to the 3D printing device 72 for additive printing manufacturing through the removable storage device 71, through step S08. In the figure, the movable storage device 71 mainly stores the whole three-dimensional slice data, and the 3D printing device 72 performs additive printing manufacturing to generate a printing model 73 after importing the whole three-dimensional slice data in the movable storage device 71; 13-16, the printing model 73 is made up of the contour support unit 30 and the 3D model 100.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. The contour supporting structure generating method is characterized by comprising the following steps of:
acquiring a triangular mesh model of the 3D model;
Selecting a 3D model;
traversing and splicing all triangular grids forming a 3D model;
selecting an A point on a triangular mesh plane of the 3D model;
taking a cross-section plane perpendicular to the Z axis through the point A;
intersecting the cross section plane with all triangular grids to obtain a section line segment intersecting with the triangular grids and line segment endpoints;
the slicing line segments of the intersecting triangular meshes are sequentially connected end to form a closed polygon;
segmenting each side of the closed polygon by taking Y millimeters as a unit to obtain points, and obtaining all segmentation points and endpoints and points A as a first set of sampling points;
designating a clock direction, taking the point A as an initial anchoring extraction point, sequentially extracting sampling points with the linear distance of L+DeltaX mm from all sampling points in the first set, and taking all sampling points as an extraction point second set;
taking all the extraction points in the second set as contact points of the contour supporting units, and leading out a plurality of contour supporting units downwards to be connected between the 3D model and the zero-plane platform;
and storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in a storage unit.
2. The method of claim 1, wherein L is a positive integer or decimal; y is also a positive integer or decimal; the ΔX is an error value less than Y.
3. The method of claim 1, wherein the clock direction comprises a counter-clockwise direction or a clockwise direction; the number of closed polygons is one or more.
4. The contour support structure generation method as defined in claim 1, wherein said contour support unit comprises: support center pillar, support folding pillar, folding pillar contact point; the folding column contact point is arranged at the tail end of the supporting folding column and is in contact connection with the surface of the 3D model; the root of the supporting folding column is connected to the top end of the supporting middle column; the bottom end of the supporting center column is connected with the zero plane platform; the shape of the supporting middle column and the supporting folding column is conical, or conical column, or cylindrical, or square column, or prismatic.
5. The contour support structure generation method as defined in claim 1, wherein said contour support unit comprises: support center pillar, support folding pillar, folding pillar contact point, bottom support platform and/or truss; the folding column contact point is arranged at the tail end of the supporting folding column and is in contact connection with the surface of the 3D model; the root of the supporting folding column is connected to the top end of the supporting middle column; the bottom end of the supporting center column is connected with a bottom supporting platform or a zero plane platform; the bottom supporting platform is connected with the zero plane platform; the trusses are connected between adjacent support center posts; the shape of the supporting center column, the supporting folding column and the truss is conical, or cylindrical, or square, or prismatic; the shape of the bottom supporting platform is flat square, or flat diamond, or flat round, or flat polygon.
6. A contour support structure generation apparatus, comprising:
a second model acquisition unit for acquiring a triangular mesh model of the 3D model;
a second model determination unit for selecting a 3D model;
the triangular grid acquisition unit is used for traversing and splicing all triangular grids forming the 3D model;
the grid plane point selection unit is used for selecting an A point on a triangular grid plane of the 3D model;
a cross-section plane determining unit for taking a cross-section plane perpendicular to the Z axis beyond the A point;
the slice line segment determining unit is used for intersecting the cross section plane with all triangular grids to obtain a slice line segment and a line segment endpoint which intersect with the triangular grids;
the closed polygon determining unit is used for sequentially connecting the slicing line segments of the intersected triangular meshes end to form a closed polygon;
the sampling point set acquisition unit is used for sectionally taking points on each side of the closed polygon by taking Y millimeters as a unit and acquiring all sectional points and end points and the point A as a first set of sampling points;
the extraction point set acquisition unit is used for designating sampling points with the linear distance of L+DeltaX millimeters for all sampling points in the first set in a clock direction by taking the point A as an initial anchoring extraction point pair and taking all the sampling points as an extraction point second set;
The support unit generation unit is used for taking all the extraction points in the second set as equal-height support unit contact points and leading out a plurality of equal-height support units downwards to be connected between the 3D model and the zero-plane platform;
and the storage unit is used for storing the whole three-dimensional data of the 3D model and the plurality of contour supporting units in the storage unit.
7. An electronic device, comprising: at least one processor; and a memory unit communicatively coupled to the at least one processor; wherein the storage unit stores instructions executable by the at least one processor to enable the at least one processor to perform the contour support structure generation method of claim 1.
8. A non-transitory computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the contour support structure generation method of claim 1.
9. A computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the contour support structure generation method of claim 1.
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| PCT/CN2022/114589 WO2023025209A1 (en) | 2021-08-27 | 2022-08-24 | Equal-height support structure generation method and apparatus, electronic device, and storage medium |
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