CN105058795B - The error compensating method of increasing material manufacturing - Google Patents
The error compensating method of increasing material manufacturing Download PDFInfo
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Abstract
The present invention proposes a kind of error compensating method of increasing material manufacturing, including：Read the model data of part, set up the three-dimensional digital model of part according to tri patch therein；One independent correction side-play amount is arranged to each tri patch, revises side-play amount and determined by the normal vector of tri patch and the sedimentation unit semi-ellipsoidal shape of tri patch present position；All tri patchs to the three-dimensional digital model of constituent part, are biased to the inside of part by set each self-corresponding independent side-play amount of revising, obtain the 3-dimensional digital correction model of part, and keep the manifold property of the 3-dimensional digital correction model of part；Using the 3-dimensional digital correction model of part, directly carry out being layered the path clustering with every layer of increasing material manufacturing deposition path, drive follow-up increasing material manufacturing technical process.The present invention can reduce the anisotropic form error causing because of the anisotropy of sedimentation unit size in increasing material manufacturing, improves precision and the forming quality of increasing material manufacturing.
Description
Technical field
The present invention relates to increases material manufacturing technology field, particularly to a kind of error compensating method of increasing material manufacturing.
Background technology
Increases material manufacturing technology, core is the thought of discrete dynamics models, and its principle is that the 3D model of part is cut into slices, and obtains
Series of parallel two dimensional surface profile, then carries out every layer of superposition deposition, thus obtaining final zero by manufacturing equipment
Part.Increasing material manufacturing is a kind of new forming mode, distinguishes traditional removal processing, manufactures three by the way of material gradually adds up
Dimension entity, is the manufacture method of a kind of " from bottom to top ", is directly driven by part three-dimensional data, Layered manufacturing.Rapid prototyping system
Make (RAPID PROTOTYPING, RP), entity freely manufactures, 3D printing etc. is this kind of technology different names.At present,
The increases material manufacturing technology developing has many types, such as 3DP (Three-Dimensional Printing, 3 D-printing),
PCM (Patternless Casting Manufacturing, non die-casting type is weaved), SLA (Stereo Lithography
Appearance, Stereolithography), LOM (Laminated Object Manufacturing, layer separated growth), FDM
(Selective Laser Sintering, laser selects for (Fused Deposition Modeling, Fused Deposition Modeling), SLS
Area sinters) etc., in fields such as part manufacture, product design, medical treatment, building and art, it is widely used.
Increases material manufacturing technology is roughly divided into two big class at present：The first kind needs high-energy-density thermal source to interact work with material
With, the commonly used laser of this class and electron beam as thermal source, it is used for molding metallic material, such as LENS (Laser
Engineered Net Shaping, laser near-net-shape), SLS, EBSM (Electron Beam Selective
Melting, electron beam selective melting) etc. technique.Equations of The Second Kind does not need high energy thermal source, typically will by the way of jet binder
Dusty material is bonded together, formable pottery, plastics and metal, and forming solid generally requires to can be only achieved through post processing and makes
With performance, the such as technique such as 3DP, PCM.With respect to first kind increases material manufacturing technology, Equations of The Second Kind binding agent sprays class increasing material manufacturing skill
Art does not need high energy thermal source, and equipment is simple, and operating cost is relatively low, and reliability is higher, therefore, Equations of The Second Kind increasing material manufacturing skill
Art development is relatively early, and application is than wide.There is the research of more this aspect at present both at home and abroad, research has masschusetts, U.S.A to manage than earlier
The 3 D-printing 3DP technology of engineering college, Tsing-Hua University's non die-casting type weaving PCM technology of China, and the PCM skill of Tsing-Hua University
Art has been carried out industrialization.
As shown in figure 1, the concrete forming step of current increasing material manufacturing includes：
1., in 3D sculpting software, design and produce three-dimensional entity model, defeated with stl file form or 3MF file format
Go out.Such file format based on tri patch, is nowadays widely used in material increasing field and field of computer aided design,
This class file format describes the surface of three-dimension geometry solid using the form of tri patch.
2. pass through data hierarchy program, tringle coal is layered along shaping direction (Z-direction), by 3D solid
Model is separated into a series of two-dimensional silhouettes.The efficiency of hierarchical algorithm impact layering and precision.
3. pass through data to-fill procedure, error compensation is carried out to discrete two-dimensional silhouette, and is converted to discernible bitmap
Form.
4. forming platform declines a thickness, subsequently carries out powdering, powder is paved and is compacted.
5. shower nozzle under the control of the computer, moves in XY direction, according to the bitmap selective deposition powder of current construction section
End, builds current layer cross section.The powder being deposited will not bond, and plays a supporting role in forming process, is shaping knot
Shu Hou, can readily remove.
6. repeat above-mentioned (4), (5) process, powdering, deposited powder, print all cross section information, until 3D solid builds
Complete.
7. take out drip molding, remove non-deposited powder.
8. pair drip molding carries out certain post processing, reaches certain use intensity.
To sum up, the error compensation mode of current increasing material manufacturing is two dimensional surface XY directional compensation.In two dimensional surface XY direction
In error compensation mode, first original tringle coal direct layering is obtained synusia data, the two dimension in synusia data is put down
Facial contour line is biased, and generally equidistant profile shrinks mode, and each layer of profile is required for processing.
Above-mentioned error compensation mode, because minimal deposition cell cube has three-dimensional XYZ three-dimensional Unequal distance size characteristics, and
Existing compensation cannot process Z-direction infiltration error, leads to the Z-direction scale error of part larger, causes to deform；Simultaneously as it is minimum heavy
The size on XYZ direction of product unit has diversity, and existing error compensation is generally X/Y plane iso-metric offset, and three-dimensional surface is actual
For Unequal distance biasing it is impossible to accurately process the anisotropic error of XYZ.
With present on problem, have impact on precision and the forming quality of increasing material manufacturing, the application of the market of increasing material manufacturing made
Become certain to hinder, so that there being better way to make up these defects.
Content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned correlation technique to a certain extent.
For this reason, it is an object of the invention to propose a kind of error compensating method of increasing material manufacturing, the method can reduce because
The anisotropic scale error causing for anisotropic sedimentation unit size, improves precision and the morphoplasm of increasing material manufacturing
Amount.
To achieve these goals, embodiments of the invention propose a kind of error compensating method of increasing material manufacturing, including
Following steps：Read the model data of part, set up the 3-dimensional digital mould of part according to the tri patch in described model data
Type, described three-dimensional digital model is made up of the surface that at least four tri patchs are constituted；One is arranged to each tri patch described
Individual independent error correction side-play amount, described error correction side-play amount is by the normal vector of described tri patch and described triangular facet
The sedimentation unit semi-ellipsoidal shape of piece present position determines；All triangular facets to the three-dimensional digital model constituting described part
Piece, is biased to the inside of part by set each self-corresponding independent error correction side-play amount, obtains the three-dimensional of part
Digital correction model, and keep the manifold property of the 3-dimensional digital correction model of described part；Three dimensions using described part
Word correction model, directly carries out being layered the control with every layer of increasing material manufacturing deposition path, drives follow-up increasing material manufacturing technique mistake
Journey.
The error compensating method of increasing material manufacturing according to embodiments of the present invention, using tringle coal data as source number
According to being processed, by independent error correction biasing is carried out to the position of each tri patch, according to the mistake of zones of different
The size of the error of difference and the same area different directions, alignment error entangles positively biased amount, processes all tri patchs with this,
Achieve the anisotropic error compensation based on tringle coal data.Therefore, the method can reduce because deposition is single
The anisotropic size of unit and the anisotropic scale error that causes, improve precision and the forming quality of increasing material manufacturing.
In addition, the error compensating method of increasing material manufacturing according to the above embodiment of the present invention, can also have and add as follows
Technical characteristic：
In some instances, the size of described error correction side-play amount is determined by anisotropic sedimentation unit semi-ellipsoidal shape
Fixed, the error correction side-play amount of diverse location, the unilateral error correction side-play amount of the different triangle of face normal vector,
Wherein sedimentation unit semielliptical is the minimum material stacking cell cube in increasing material manufacturing, and it is shaped as along X/Y/Z tri- axle radius not
Deng semiellipsoid.
In some instances, the three-dimensional digital model of described part has the topological relation of dotted line, point face and line face.
In some instances, described error correction side-play amount is defined as the sedimentation unit semielliptical of current tri patch position
The distance in the face that the enveloping surface of stacking is formed to sedimentation unit semielliptical centre of sphere line.
In some instances, all tri patchs to the three-dimensional digital model constituting described part, by set each
Self-corresponding independent error correction side-play amount, to the internal bias of part, further includes：By each tri patch and with its phase
The adjacent and equal tri patch of direction vector is merged to form polygonal patch, by described polygonal patch to described part
Inside be biased.
In some instances, also include：Polygon to generation intersecting between adjacent triangular faces according to tri patch rule
Shape dough sheet carries out triangle division, specifically includes：Ask for the intersection with adjacent triangular faces after each tri patch described biases, and
Triangle division is carried out to the intersecting polygonal patch not meeting tri patch rule causing, is allowed to meet tri patch rule.
In some instances, ask for the intersection with adjacent triangular faces after each tri patch described biases, wrap further
Include：Described adjacent triangular faces include connect tri patch and summit of adjacent side and adjoin tri patch, and each tri patch described is inclined
Postpone and intersect including the following two kinds situation with adjacent triangular faces：Connected after described each tri patch biasing triangular facet with adjacent side
Piece intersects, and intersects and produces normal tri patch, asks for intersection；And adjoin triangle with summit after the biasing of described each tri patch
Dough sheet intersects, and now may produce the quad patch not being inconsistent normally, the quad patch of generation be carried out tri patch and draws
Point, it is allowed to meet tri patch rule.
In some instances, also include：Error deviation correction according to tri patch to described tri patch each
Line displacement is entered on summit, specifically includes：The new summit being formed after asking for each summit described biasing or multiple summit, to described new top
Point or the polygon that is connected to form of multiple summit carry out tri patch division, are allowed to meet tri patch rule.
In some instances, the new summit being formed after asking for each summit described biasing or multiple summit, further include：
The new summit obtaining after the biasing of each summit described includes the following two kinds situation：An available top after the biasing of each summit described
Point, be now connected the normal tri patch of generation with other adjacent triangle；And obtain multiple tops after the biasing of each summit described
Point, is now connected with other adjacent triangle and may produce the space polygon dough sheet not meeting tri patch rule, will produce
Space polygon dough sheet carry out triangle division, be allowed to meet tri patch rule.
In some instances, described error includes error that minimal deposition unit volume causes and/or production technology causes
Error.
The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
The above-mentioned and/or additional aspect of the present invention and advantage will become from reference to the description to embodiment for the accompanying drawings below
Substantially and easy to understand, wherein：
Fig. 1 is the flow chart of existing infiltration error compensating method；
Fig. 2 is the flow chart of the error compensating method of increasing material manufacturing according to an embodiment of the invention；
Fig. 3 is the flow chart of increasing material manufacturing process according to an embodiment of the invention；
Fig. 4 is sedimentation unit error schematic diagram according to an embodiment of the invention；
Fig. 5 is sedimentation unit form schematic diagram according to an embodiment of the invention；
Fig. 6 is the intersecting 2D perspective diagram of tri patch biasing according to an embodiment of the invention；
Fig. 7 is that the deposited distance of X-Z plane according to one specific embodiment of the present invention or Y-Z plane defines schematic diagram；
Fig. 8 is that the deposited distance of the X-Y plane according to one specific embodiment of the present invention defines schematic diagram；
Fig. 9 is that the non-triangle dough sheet according to one specific embodiment of the present invention produces and processing method schematic diagram；
Figure 10 is the sample tringle coal schematic diagram in the embodiment of the present invention 2；
Figure 11 is the schematic diagram that three-dimensional grid model in the embodiment of the present invention 2 carries out error compensation；
Figure 12 is that the error anisotropy of one specific embodiment of the present invention compensates schematic diagram.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
Spray the infiltration error compensation side of increasing material manufacturing below in conjunction with Description of Drawings binding agent according to embodiments of the present invention
Method.
Fig. 2 is the flow chart of the error compensating method of the increasing material manufacturing according to one embodiment of the invention.As shown in Fig. 2
The method comprises the following steps：
Step S101, reads the model data of part, sets up three dimensions of part according to the tri patch in model data
Word model, three-dimensional digital model is made up of the surface that at least four tri patchs are constituted.Wherein, in one embodiment of the present of invention
In, the three-dimensional digital model of part has the topological relation of dotted line, point face and line face.In other words, this step is i.e. according to original
Tri patch data genaration has the triangular surface patch grid of topology information.It should be noted that this process data is not done any
Conversion process, only extracts the topological relation of dotted line, point face and line face, for, in the coordinate transformation process of subsequent step, keeping
The correctness of model data.
Step S102, arranges an independent error correction side-play amount, this error correction side-play amount to each tri patch
Determined by the semi-ellipsoidal shape of the normal vector of tri patch and the sedimentation unit of this tri patch present position.Wherein, at this
In one embodiment of invention, for example, the size of error correction side-play amount is determined by anisotropic sedimentation unit semi-ellipsoidal shape
Fixed, the error correction side-play amount of diverse location, the error correction side-play amount of the different tri patch of face normal vector,
Wherein sedimentation unit semielliptical is the minimum material stacking cell cube in increasing material manufacturing, and it is shaped as along X/Y/Z tri- axle radius not
Deng semiellipsoid.Further, in some instances, the definition of error correction side-play amount is, for example, current tri patch position
Sedimentation unit semielliptical stacking the distance in face that formed to sedimentation unit semielliptical centre of sphere line of enveloping surface.As specific
Example, Fig. 4 (a) and Fig. 4 (b) illustrate sedimentation unit error and illustrate.Fig. 7 (a) and Fig. 7 (b) and Fig. 7 (c) illustrates X-Z plane
Or the definition of deposited distance is illustrated on Y-Z plane.Fig. 8 (a) and Fig. 8 (b) illustrates deposited distance definition on X-Y plane and illustrates.
Wherein, D is error correction side-play amount, and that is, the enveloping surface of the sedimentation unit semielliptical stacking of current tri patch position is single to deposition
The distance in the face that first semielliptical centre of sphere line is formed.
Specifically, for example, shown in Fig. 7, if error correction side-play amount is d, O is the centre of sphere of sedimentation unit semielliptical, when first three
The face normal vector of edged surface piece is(unit vector, mould be 1), the deposition of the centre of sphere O of sedimentation unit semielliptical to enveloping surface point of contact
Vector isThen deposited distance is projector distance on the normal vector direction of face for the deposition vector, that is,：
If size on tri- directions of X/Y/Z for the deposition errors is respectively ex, ey, ez, then the parsing of sedimentation unit semielliptical
Equation is：
Then on sedimentation unit half ellipsoidal surface, the normal vector of any point is：
Order
Can obtain：
I.e. point of contact coordinate (x0,y0,z0), then deposit vectorFor：
Therefore, it can try to achieve error correction side-play amount d and be：
It follows that the independent error correction side-play amount of each tri patch only deposition errors with tri- directions of X/Y/Z
Amount (i.e. three axle radiuses of ellipsoid) related with the face normal vector of tri patch, the tri patch that face normal vector differs its
Error correction side-play amount is different.
Step S103, all tri patchs to the three-dimensional digital model of constituent part, by set each self-corresponding
Independent error correction side-play amount is biased to the inside of part, obtains the 3-dimensional digital correction model of part, and keeps part
3-dimensional digital correction model manifold property.Specifically, this step further includes：By each tri patch and with its phase
Even and direction vector equal (equidirectional) tri patch (may not exist) merge after form polygonal patch (namely plane be many
Side shape), and this polygonal patch is biased to the internal direction of part, specific amount of bias is repaiied for each self-corresponding error
Positive offset amount.It should be noted that keeping the topological relation between tri patch during biasing.As specific example, Fig. 5 exhibition
Show that sedimentation unit form is illustrated.
Further, in one embodiment of the invention, in step s 103, for example also include：According to tri patch
Rule carries out triangle division to the polygonal patch generating intersecting between adjacent triangular faces.Specifically, that is, to the institute obtaining
The form having the corresponding model data of tri patch carries out correctness verification, including the correctness of topological relation and face normal vector
Verification, finally gives correctly complete three-dimensional grid model after error compensation is processed, namely the 3-dimensional digital of final part is repaiied
Positive model.
Wherein, in one embodiment of the invention, above-mentioned according to tri patch rule to adjacent triangular faces between
The intersecting polygonal patch generating carries out triangle division, specifically includes：Firstly the need of ask for each tri patch biasing after with phase
The intersection of adjacent tri patch, and triangle division is carried out to the intersecting polygonal patch not meeting tri patch rule causing, make
Meet tri patch rule.Wherein, after asking for the biasing of each tri patch during intersection with adjacent triangular faces, due to phase
Adjacent tri patch includes connect tri patch and summit of adjacent side and adjoins tri patch, therefore after the biasing of each tri patch with adjacent
Tri patch intersects and includes the following two kinds situation：
The first：The tri patch that connected with adjacent side after the biasing of each tri patch is intersected, and intersects and produces normal tri patch,
Ask for intersection.As specific example, Fig. 6 illustrates tri patch biasing intersecting 2D perspective and illustrates.Wherein, facet1 is
One tri patch, facet2 is the tri patch connecting with facet1, and edge1 is the intersection of facet2 and facet1, edge2
New intersection after moving along normal direction respectively for facet1 and facet2,Face normal vector for facet1,For facet2's
Face normal vector, θ is the angle of facet2 and facet1.
Second：Adjoin tri patch with summit after the biasing of each tri patch to intersect, now may produce and not meet three
The quad patch of edged surface piece rule, the quad patch of generation is carried out tri patch division, is allowed to meet triangular facet sheet gauge
Then.As specific example, Fig. 9 illustrates the generation of non-triangle dough sheet (as shape changeable dough sheet) and processing method is illustrated.Wherein,
A, B, C, D, E, F constitute summit for tri patch, and G, H, I are new triangular plate along face normal vector after mobile for the tri patch facet1
The summit of face facet1 ', J, K, L are the intersection point of tri patch facet1 ' and other tri patch sides.
In another example, in above-mentioned steps S103, for example, also include：Error deviation correction according to tri patch
Amount enters line displacement to each summit of tri patch, specifically includes：The new summit or multiple being formed after asking for the biasing of each summit
Summit, the polygon that new summit or multiple summit are connected to form carries out tri patch division, is allowed to meet tri patch rule.
More specifically, the above-mentioned new summit asking for being formed after each summit biases or multiple summit, specifically include：Each summit biases
The new summit obtaining afterwards includes the following two kinds situation：An available summit after the biasing of each summit, now with other adjacent three
The normal tri patch of angular connected generation；And obtain multiple summits, now with other adjacent triangle after the biasing of each summit
It is connected and may produce the space polygon dough sheet not meeting tri patch rule, the space polygon dough sheet of generation is carried out triangle
Divide, be allowed to meet tri patch rule.
Specifically, for the ease of understanding the offset manner of tri patch, for example, can come through but not limited to following example
Describe in detail, specifically include following steps：
1. read one of three-dimensional digital model summit P0=(x0,y0,z0), obtain all triangular facets adjacent thereto
Piece T={ T1,T2,…,Tm, the independent error correction side-play amount D={ d of each tri patch can be obtained further1,
d2,…,dm}.
2. set the new summit after skew as P=(x, y, z), it should meet each tri patch { T1,T2,…,Tm}
Distance be { d1,d2,…,dm, if function Dis (P, Ti)=diRepresent that point P=(x, y, z) arrives tri patch TiDistance be
di, then：
First, if tri patch TiAnalytic equation be Aix+Biy+Ciz+Di=0, then all of tri patch T={ T1,
T2,…,TmBe represented by：
I.e.
MX=b,
Because point P0=(x0,y0,z0) obviously meet MX=b, so MX=b has unique untrivialo solution P0=(x0,y0,z0), can
Know that the order of its coefficient matrix is equal to the order of its augmented matrix, i.e. r (M)=r (Mb)=3.
Tri patch { T is arrived for point P=(x, y, z)1,T2,…,TmDistance be respectively：
Can obtain
I.e.
MX=b',
Now, if order r of augmented matrix (Mb')=3, r (M)=r (Mb')=3, that is, there is point P=(x, y, z) and meet
Distance to each tri patch is { d1,d2,…,dm, this time point P=(x, y, z) can be by solving Linear Equations
MX=b' can obtain；If r (Mb')>3, then do not exist an independent point meet each tri patch distance be { d1,d2,…,
dm, now m tri patch is divided some groups so that the order r (M of each group of augmented matrixibi')=3, and obtain each respectively
Solution P of group Linear Equationsi=(x, y, z), and each is solved PiThe maximum convex closure polygon that=(x, y, z) is formed enters
Row tri patch is so as to meet tri patch rule.
3. execute above-mentioned steps 1 and step 2 successively to process each summit of three-dimensional digital model.Now gained is new
Each of three-dimensional digital model tri patch all meet each independent error correction side-play amount.
4. tri patch skew finishes.
Step S104, using the 3-dimensional digital correction model of part, directly carries out layering and every layer of increasing material manufacturing deposited roads
The control in footpath, drives follow-up increasing material manufacturing technical process.In other words, as shown in figure 3, the i.e. 3-dimensional digital to the part obtaining
Correction model (i.e. finally complete three-dimensional grid model) is layered, and generates follow-up increasing material manufacturing driving according to layering result
Data, to drive follow-up increasing material manufacturing technical process.It should be noted that this process need not perform any compensation, eliminate
The concept of profile live width, can directly generate follow-up increasing material manufacturing driving data.
Specifically, in the examples described above, determine the size of error correction side-play amount, first pass through experiment or theoretical modeling
Obtain minimal deposition element form, a minimal deposition element form theoretically semi-ellipsoidal shape, equatorial radius a, b of ellipsoid and
Polar radius c parameter is X-direction deposition, Y-direction deposition and Z-direction deposition, and three is determined by actual deposition situation.Typically
In the case of, increase sedimentation unit in wealth manufacture process unhindered settling be each to different forms, equatorial radius a and b are generally very
Close, polar radius c is generally less than equatorial radius a, b, such as shown in Fig. 5.
In one embodiment of the invention, during error correction side-play amount is oozed in determination, error is for example included
The coating thickness of particular surface in error that little sedimentation unit volume causes and/or the error that production technology causes, such as PCM technique
Degree error.More specifically, in some instances, each tri patch is arranged with the mistake of an independent error correction side-play amount
Journey for example includes following step：
Step a：Set up the mathematics physics model of deposition process, provide the theoretical error side-play amount of sedimentation unit.
Step b：It is used theoretical error side-play amount as error compensation foundation, directly carry out error compensation, and manufacture
Actual parts model.
Step c：The scale error of measurement actual parts model, is corrected to theoretical error side-play amount, obtains final
Error correction side-play amount.
Further, in actual production technical process, also include after step c：
Step d：It is used final error correction side-play amount as error compensation foundation, carries out error compensation, obtain final
Through the model data of the tri patch of error compensation, and then obtain the three-dimensional grid model of final part.
To sum up, the error compensating method of increasing material manufacturing according to embodiments of the present invention, is made using tringle coal data
Processed for source data, by the position of each tri patch is carried out with independent error correction biasing, according to not same district
The size of the error of the error in domain and the same area different directions, alignment error entangles positively biased amount, processes all three with this
Edged surface piece is it is achieved that anisotropic error compensation based on tringle coal data.Therefore, the method can reduce because
The anisotropic size of sedimentation unit and the anisotropic scale error that causes, improve precision and the morphoplasm of increasing material manufacturing
Amount.
Error compensating method below in conjunction with the increasing material manufacturing to the above embodiment of the present invention for the specific embodiment is said
Bright.
Embodiment 1
The mode of increasing material manufacturing has a lot, and typically a kind of mode sprays increasing material manufacturing for binding agent.
In order to make it easy to understand, in the present embodiment, in binding agent injection increasing material manufacturing mode as a example, the above-mentioned reality to the present invention
The error compensating method applying the increasing material manufacturing of example is described further.
In the present embodiment, binding agent sprays the infiltration error compensating method of increasing material manufacturing, specifically includes following steps：
Step a：Read the model data of part, set up the 3-dimensional digital mould of part according to the tri patch in model data
Type, three-dimensional digital model is made up of the surface that at least four tri patchs are constituted.Wherein, the three-dimensional digital model of part has a little
The topological relation of line, point face and line face.
Step b：One independent infiltration error correction side-play amount is arranged to each tri patch, this infiltration error correction is inclined
Shifting amount is determined by the normal vector of tri patch and the infiltration semielliptical of this tri patch present position.Wherein, infiltration error is repaiied
The size of positive offset amount is determined by anisotropic infiltration semielliptical, the infiltration error correction side-play amount of diverse location, face
The unilateral infiltration error correction side-play amount of the different triangle of normal vector, wherein infiltration semielliptical drops in powder for binder liquid
The semielliptical that the X/Y/Z tri- axle radius of formation does not wait is permeated in end.Further, the definition of infiltration error correction side-play amount is to work as
The enveloping surface that the binding agent of front triangle dough sheet position permeates semielliptical stacking permeates what semielliptical centre of sphere line was formed to binding agent
The distance in face.
Step c：All tri patchs to the three-dimensional digital model of constituent part, by set each self-corresponding independence
Infiltration error correction side-play amount is biased to the inside of part, obtains the 3-dimensional digital correction model of part, and keeps part
3-dimensional digital correction model manifold property.
Step d：Using the 3-dimensional digital correction model of part, directly carry out being layered and the path of every layer binder injection is controlled
System, drives follow-up increasing material manufacturing technical process.
Specifically, during binding agent injection increasing material manufacturing, the process of data generally comprises tringle coal
Modeling process, delaminating process and error compensation generate the process of bitmap.And in the present embodiment, it is layered it in tringle coal
Before carry out permeate error compensation, error compensation problem need not be considered further that after layering.In data processing, three are obtained first
Edged surface piece model data, then carries out to tringle coal permeating error compensation, and last direct layering generates and increases for follow-up
The driving data that material manufactures.
Embodiment 2
In the present embodiment, specific operating process is such as taking the error compensating method that binding agent sprays increasing material manufacturing as a example
Under：
1 equipment：Binding agent injection increasing material manufacturing equipment and other necessary part, have selected Tsing-Hua University's machinery in this example
The PCM technology of system's research and development.
2 data：Sample tringle coal, for square body Model, such as shown in Figure 10 (a) and Figure 10 (b).
3 experiment purposes：With the infiltration error compensating method based on tringle coal, sample model is carried out permeating error
Compensate.
4 implementation steps：
A：Reconstruction of Topological Relation is carried out to sample tringle coal data, and repairs Topology Error, generate three-dimensional grid
Model.
B：According to theoretical saturated model, three-dimensional grid model is carried out with theoretical infiltration error compensation.
C：Three-dimensional grid model is layered, and carries out entity manufacture.
D：The material object parts scale error that measurement manufactures, is modified to theoretical infiltration error, obtains actual infiltration error
Compensation dosage.
E：Carry out permeating error compensation, the tringle coal number after being compensated according to actual infiltration error compensation amount
According to.As specific example, as shown in figure 11, X/Y plane plan view, such as dough sheet F1, the error compensation amount of F2, F3 is d1,
d2,d3, different, all dough sheets are biased according to respective error deviation amount, are compensated rear three-dimensional grid model, such as XY
In top view, the lines of inner side are model boundary after compensation.As another specific example, such as shown in Figure 12, with spheroid it is
Example, illustrates infiltration error anisotropy and compensates (three-dimensional Unequal distance compensation) and illustrate it can be seen that the error compensation of different dough sheet
Amount (namely infiltration error correction side-play amount) is different.
F：Tringle coal data after compensating is layered, generates data bitmap, for actual normal increasing material system
Make.
Therefore, as can be seen that the method for the present invention improves binding agent injection increasing material manufacturing skill from the above embodiments
The data processing method of art, and improve the precision of shaping and the quality of formation of parts, reduce because infiltration cause each to different
The scale error of property.The development spraying increases material manufacturing technology to binding agent has very big facilitation, has very high economy
It is worth.
To sum up, the cardinal principle of the infiltration error compensating method of binding agent injection increasing material manufacturing of above-described embodiment description can
It is summarized as：Obtain primary model data, determine that according to region and position the corresponding infiltration error correction of each tri patch is inclined
Shifting amount, i.e. the displacement bias amount of three apex coordinates, the biased direction of each tri patch is the internal direction of part.Subsequently right
Each tri patch asks for corresponding infiltration error correction side-play amount, implements translation to tri patch, to three after translation
Edged surface piece carries out intersecting process so as to meet tri patch data rule with adjacent triangular faces, finally gives all triangular facets
Three-dimensional grid model data after piece biasing, the 3-dimensional digital correction model after as compensating.It is then carried out as shown in Figure 2 gluing
Step S104 that increasing material manufacturing process is sprayed in knot agent, this process need not carry out error compensation to data again, that is, be no longer necessary to take turns
Profile width compensates, and Z-direction compensating operation, can directly generate for driving the follow-up increasing wealth manufacture of increasing material manufacturing technical process to drive
Dynamic data.
To sum up, the binding agent of above-described embodiment description sprays the infiltration error compensating method of increasing material manufacturing, using original three
Edged surface piece model data is processed as source data, by carrying out independent infiltration error to the position of each tri patch
Correct biasing, the infiltration error according to zones of different and the size of the infiltration error of the same area different directions, alignment error
Entangle positively biased amount, all tri patchs are processed with this it is achieved that anisotropic infiltration based on tringle coal data
Error compensation.Therefore, the method can reduce the anisotropic size causing because of the anisotropic infiltration of binding agent
Error, improves precision and the forming quality that binding agent sprays increasing material manufacturing.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation of instruction such as pin ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must
Must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
Connect or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limit unless otherwise clear and definite.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combine.
Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example
Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of error compensating method of increasing material manufacturing is it is characterised in that comprise the following steps：
Read the model data of part, set up the three-dimensional digital model of part, institute according to the tri patch in described model data
State three-dimensional digital model to be made up of the surface that at least four tri patchs are constituted；
One independent error correction side-play amount is arranged to each tri patch described, described error correction side-play amount is by described three
The semi-ellipsoidal shape of the sedimentation unit of the normal vector of edged surface piece and described tri patch present position determines；
All tri patchs to the three-dimensional digital model constituting described part, are repaiied by set each self-corresponding independent error
Positive offset amount is biased to the inside of part, obtains the 3-dimensional digital correction model of part, and keeps the three-dimensional of described part
The manifold property of digital correction model；
Using the 3-dimensional digital correction model of described part, directly carry out being layered the control with every layer of increasing material manufacturing deposition path,
Drive follow-up increasing material manufacturing technical process.
2. the error compensating method of increasing material manufacturing according to claim 1 is it is characterised in that described error correction side-play amount
Size determined by anisotropic sedimentation unit semi-ellipsoidal shape, the error correction side-play amount of diverse location, face normal direction
The error correction side-play amount of the different tri patch of vector, wherein sedimentation unit semielliptical are the minimum material in increasing material manufacturing
Stockpile product unit body, it is shaped as the semiellipsoid not waited along X/Y/Z tri- axle radius.
3. the error compensating method of increasing material manufacturing according to claim 1 is it is characterised in that the 3-dimensional digital of described part
Model has the topological relation of dotted line, point face and line face.
4. the error compensating method of increasing material manufacturing according to claim 1 is it is characterised in that described error correction side-play amount
The enveloping surface of sedimentation unit semielliptical stacking being defined as current tri patch position is to sedimentation unit semielliptical centre of sphere line shape
The distance in the face becoming.
5. increasing material manufacturing according to claim 1 error compensating method it is characterised in that described to constitute described part
Three-dimensional digital model all tri patchs, by set each self-corresponding independent error correction side-play amount into part
Portion biases, and further includes：
By each tri patch and be adjacent and tri patch that direction vector is equal is merged with to form polygonal patch,
Described polygonal patch is biased to the inside of described part.
6. the error compensating method of increasing material manufacturing according to claim 5 is it is characterised in that also include：According to triangular facet
Piece rule carries out triangle division to the polygonal patch generating intersecting between adjacent triangular faces, specifically includes：
Ask for the intersection with adjacent triangular faces after described each tri patch biasing, and to intersecting cause do not meet triangular facet
The polygonal patch of piece rule carries out triangle division, is allowed to meet tri patch rule.
7. the error compensating method of increasing material manufacturing according to claim 6 is it is characterised in that ask for each triangular facet described
After piece biasing, the intersection with adjacent triangular faces, further includes：
Described adjacent triangular faces include connect tri patch and summit of adjacent side and adjoin tri patch, and each tri patch described is inclined
Postpone and intersect including the following two kinds situation with adjacent triangular faces：
The tri patch that connected with adjacent side after described each tri patch biasing is intersected, and intersects and produces normal tri patch, asks for handing over
Line；And
Adjoin tri patch with summit after described each tri patch biasing to intersect, now may produce four sides not being inconsistent normally
Shape dough sheet, the quad patch of generation is carried out tri patch division, is allowed to meet tri patch rule.
8. the error compensating method of increasing material manufacturing according to claim 5 is it is characterised in that also include：According to triangular facet
The error deviation correction of piece enters line displacement to each summit of described tri patch, specifically includes：
The new summit being formed after asking for each summit described biasing or multiple summit, be connected shape to described new summit or multiple summit
The polygon becoming carries out tri patch division, is allowed to meet tri patch rule.
9. the error compensating method of increasing material manufacturing according to claim 8 is it is characterised in that each summit described in asking for is inclined
Postpone the new summit of formation or multiple summit, further include：
The new summit obtaining after the biasing of each summit described includes the following two kinds situation：
An available summit after the biasing of each summit described, be now connected the normal triangular facet of generation with other adjacent triangle
Piece；And
Multiple summits are obtained, being now connected with other adjacent triangle to produce does not meet triangle after the biasing of each summit described
The space polygon dough sheet of dough sheet rule, the space polygon dough sheet of generation is carried out triangle division, is allowed to meet tri patch
Rule.
10. the error compensating method of increasing material manufacturing according to claim 1 is it is characterised in that described error includes minimum
Error that sedimentation unit volume causes and/or the error that production technology causes.
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| WO2019022770A1 (en) * | 2017-07-28 | 2019-01-31 | Hewlett-Packard Development Company, L.P. | Transforming property data to compensate for property value shifts |
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| CN109808183B (en) * | 2019-01-03 | 2020-06-16 | 中国科学院自动化研究所 | 3D printing error compensation method, system and device based on neural network |
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| US11794415B2 (en) * | 2020-09-23 | 2023-10-24 | Ut-Battelle, Llc | System and method for simulation-assisted additive manufacturing involving estimating anisotropic deformation |
| CN112265265B (en) * | 2020-09-23 | 2024-07-09 | 上海漫格科技有限公司 | Three-dimensional printing data z-axis compensation method based on slicing |
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| CN113158271B (en) * | 2021-03-29 | 2024-06-07 | 北京机科国创轻量化科学研究院有限公司 | Adaptive layering method for continuous fiber additive manufacturing based on dimensional error compensation |
| CN113317872B (en) * | 2021-05-11 | 2024-05-17 | 南通罗伯特医疗科技有限公司 | Mandible operation space modeling method for intraoral incision |
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| CN115091759A (en) * | 2022-06-21 | 2022-09-23 | 重庆大学 | Thin rod type porous structure deformation numerical value compensation method based on life and death unit method |
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