CN105058795A - Error compensating method for material-increase manufacturing - Google Patents

Error compensating method for material-increase manufacturing Download PDF

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CN105058795A
CN105058795A CN201510478131.5A CN201510478131A CN105058795A CN 105058795 A CN105058795 A CN 105058795A CN 201510478131 A CN201510478131 A CN 201510478131A CN 105058795 A CN105058795 A CN 105058795A
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tri patch
error
summit
patch
biased
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CN105058795B (en
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林峰
马旭龙
张磊
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Tsinghua University
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Tsinghua University
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Abstract

The invention provides an error compensating method for material-increase manufacturing. The method includes the steps that model data of a part are read, and a three-dimensional digital model of the part is established according to triangular face sheets; an independent correction offset is set for each triangular face sheet and determined by a normal vector of the triangular face sheet and the semi-ellipsoidal shape of a sedimentation unit at the position where the triangular face sheet is located; all the triangular face sheets forming the three-dimensional digital model of the part are deflected to the interior of the part according to the set independent correction offsets corresponding to the triangular face sheets, a three-dimensional digital correction model of the part is obtained, and the manifold property of the three-dimensional digital correction model of the part is maintained; and layering and material-increase manufacturing of each layer are directly performed to achieve path control of a sedimentation path according to the three-dimensional digital correction model of the part, and a subsequent material-increase manufacturing craft process is driven. The error compensating method can reduce anisotropy forming errors caused by anisotropy of the size of the sedimentation unit during material-increase manufacturing and increase material-increase manufacturing precision and forming quality.

Description

Increase the error compensating method that material manufactures
Technical field
The present invention relates to and increase material manufacturing technology field, particularly a kind of error compensating method increasing material and manufacture.
Background technology
Increase material manufacturing technology, core is the thought of discrete dynamics models, and its principle is cut into slices by the 3D model of part, obtains series of parallel two dimensional surface profile, is then carried out the superposition deposition of every layer by manufacturing equipment, thus obtains final part.Increasing material manufacture is a kind of novel forming mode, and distinguish traditional removal processing, the mode adopting material to add up gradually manufactures 3D solid, is the manufacture method of a kind of " from bottom to top ", by part three-dimensional data Direct driver, and Layered manufacturing.Rapid prototype manufacturing (RAPIDPROTOTYPING, RP), entity freely manufacture, 3D printing etc. is the different names of this kind of technology.At present, the increasing material manufacturing technology developed has many types, as 3DP (Three-DimensionalPrinting, 3 D-printing), PCM (PatternlessCastingManufacturing, non die-casting type is weaved), SLA (StereoLithographyAppearance, Stereolithography), LOM (LaminatedObjectManufacturing, layer separated growth), FDM (FusedDepositionModeling, Fused Deposition Modeling), SLS (SelectiveLaserSintering, selective laser sintering) etc., in part manufacture, product design, medical treatment, the fields such as building and art, be widely used.
Current increasing material manufacturing technology is roughly divided into two large classes: the first kind needs high-energy-density thermal source to come and material interaction, this class generally adopts laser and electron beam as thermal source, be used for molding metallic material, as LENS (LaserEngineeredNetShaping, laser near-net-shape), the technique such as SLS, EBSM (ElectronBeamSelectiveMelting, electron beam selective melting).Equations of The Second Kind does not need high energy thermal source, and dusty material is bonded together by the general mode of jet binder that adopts, can shaped ceramic, plastics and metal, and forming solid generally needs just can reach serviceability, as techniques such as 3DP, PCM through post processing.Increase material manufacturing technology relative to the first kind, Equations of The Second Kind binding agent sprays class increasing material manufacturing technology does not need high energy thermal source, and equipment is simple, and operating cost is lower, and reliability is higher, and therefore, Equations of The Second Kind increases material Manufacturing Technology Development comparatively early, and Application comparison is extensive.Have the research of this aspect more at present both at home and abroad, the research 3 D-printing 3DP technology having Massachusetts Institute Technology relatively early, Tsing-Hua University's non die-casting type of China weaves PCM technology, and the PCM technology of Tsing-Hua University realizes industrialization.
As shown in Figure 1, the concrete forming step of current increasing material manufacture comprises:
1. in 3D sculpting software, design and produce three-dimensional entity model, export with stl file form or 3MF file format.This type of is based on the file format of tri patch, has nowadays been widely used in and has increased material manufacture field and field of computer aided design, and this class file format uses the form of tri patch to describe the surface of three-dimension geometry solid.
2., by data hierarchy program, along shaping direction (Z-direction), layering is carried out to tringle coal, three-dimensional entity model is separated into a series of two-dimensional silhouette.Hierarchical algorithm affects efficiency and the precision of layering.
3., by data stuffing program, error compensation is carried out to discrete two-dimensional silhouette, and is converted to discernible bitmap format.
4. forming platform declines a thickness, and carry out paving powder subsequently, powder is paved and is compacted.
5. shower nozzle under the control of the computer, in the motion of XY direction, according to the selective deposited powder of the bitmap of current construction section, builds current layer cross section.The powder not carrying out depositing can not bond, and plays a supporting role in forming process, after shaping terminates, can be easy to remove.
6. repeat above-mentioned (4), (5) process, paving powder, deposited powder, print all cross section information, until 3D solid has built.
7. take out drip molding, remove non-deposited powder.
8. pair drip molding carries out certain post processing, reaches certain working strength.
To sum up, the error compensation mode increasing material manufacture is at present two dimensional surface XY directional compensation.In two dimensional surface XY deflection error compensation way, first original tringle coal direct layering is obtained synusia data, be biased the two dimensional surface outline line in synusia data, be generally equidistant profile and shrink mode, every one deck profile all needs process.
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, causes the Z-direction scale error of part comparatively large, causes distortion; Simultaneously because the size on XYZ direction of minimal deposition unit has otherness, existing error compensation is generally XY plane systematic and is biased, three-dimensional surface actual for Unequal distance biased, the anisotropic error of XYZ cannot be processed accurately.
Above Problems existing, have impact on the precision and forming quality that increase material manufacture, causes certain obstruction, thus need better mode to make up these defects to the market application increasing material manufacture.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned correlation technique at least to a certain extent.
For this reason, the object of the invention is to propose a kind of error compensating method increasing material and manufacture, the method can reduce the anisotropic scale error caused because of anisotropic sedimentation unit size, improves the precision and forming quality that increase material manufacture.
To achieve these goals, embodiments of the invention propose a kind of error compensating method increasing material and manufacture, comprise the following steps: the model data reading part, set up the three-dimensional digital model of part according to the tri patch in described model data, the surface that described three-dimensional digital model is made up of at least four tri patch is formed; Arrange an independently error correction side-play amount to described each tri patch, described error correction side-play amount is determined by the normal vector of described tri patch and the sedimentation unit semielliptical shape of described tri patch present position; To all tri patch of the three-dimensional digital model of the described part of formation, be biased by the inside of set each self-corresponding independent error correction side-play amount to part, obtain the 3-dimensional digital correction model of part, and keep the stream shape character of the 3-dimensional digital correction model of described part; Utilize the 3-dimensional digital correction model of described part, directly carry out the control of layering and every layer of increasing material manufacture deposition path, drive follow-up increasing manufacture process process.
According to the error compensating method that the increasing material of the embodiment of the present invention manufactures, tringle coal data are adopted to process as source data, be biased by carrying out independently error correction to the position of each tri patch, according to the error of zones of different and the mistake extent of the same area different directions, alignment error entangles positively biased amount, process all tri patch with this, achieve the anisotropic error compensation based on tringle coal data.Therefore, the method can reduce the anisotropic scale error caused because of the anisotropic size of sedimentation unit, improves the precision and forming quality that increase material manufacture.
In addition, the error compensating method that increasing material according to the above embodiment of the present invention manufactures, can also have following additional technical characteristic:
In some instances, the size of described error correction side-play amount is determined by anisotropic sedimentation unit semielliptical shape, the error correction side-play amount of diverse location is not etc., the unilateral error correction side-play amount of the different triangle of face normal vector is not etc., wherein sedimentation unit semielliptical is increase the minimum material stacking cell cube in material manufacture, and its shape is the semiellipsoid do not waited along X/Y/Z tri-axle radius.
In some instances, the three-dimensional digital model of described part has the topological relation in dotted line, some face and line face.
In some instances, described error correction side-play amount is defined as the distance in the face that the stacking enveloping surface of the sedimentation unit semielliptical of current tri patch position is formed to sedimentation unit semielliptical centre of sphere line.
In some instances, to all tri patch of the three-dimensional digital model of the described part of formation, by the internal bias of set each self-corresponding independent error correction side-play amount to part, comprise further: by each tri patch and to be adjacent and the equal tri patch of direction vector carries out merging to form polygonal patch, the inside of described polygonal patch to described part is biased.
In some instances, also comprise: carry out triangle division according to tri patch rule to intersecting the polygonal patch generated between adjacent triangular faces, specifically comprise: ask for described each tri patch and be biased intersection that is rear and adjacent triangular faces, and carry out triangle division to intersecting the polygonal patch not meeting tri patch rule caused, make it to meet tri patch rule.
In some instances, ask for described each tri patch and be biased intersection that is rear and adjacent triangular faces, comprise further: described adjacent triangular faces comprises connect tri patch and summit of adjacent side and adjoins tri patch, described each tri patch is crossing with adjacent triangular faces after being biased comprises the following two kinds situation: the tri patch that connects with adjacent side after described each tri patch is biased intersects, intersect and produce normal tri patch, ask for intersection; And described each tri patch biased after to adjoin tri patch crossing with summit, now may produce and not meet regular quad patch, the quad patch of generation be carried out tri patch division, makes it to meet tri patch rule.
In some instances, also comprise: each summit of error deviation correction to described tri patch according to tri patch offsets, specifically comprise: ask for described each summit and be biased the new summit of rear formation or multiple summit, tri patch division is carried out to the polygon that described new summit or multiple summit are connected to form, makes it to meet tri patch rule.
In some instances, ask for described each summit and be biased the new summit of rear formation or multiple summit, comprise further: the new summit obtained after described each summit is biased comprises the following two kinds situation: can obtain a summit after described each summit is biased, being now connected with other adjacent triangle produces normal tri patch; And described each summit biased after obtain multiple summit, be now connected with other adjacent triangle the space polygon dough sheet that may produce and not meet tri patch rule, the space polygon dough sheet of generation carried out triangle division, makes it to meet tri patch rule.
In some instances, described error comprises error that minimal deposition unit volume causes and/or the error that production technology causes.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the flow chart of existing infiltration error compensating method;
Fig. 2 is the flow chart increasing the error compensating method that material manufactures according to an embodiment of the invention;
Fig. 3 is the flow chart increasing material manufacture 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 that tri patch is biased crossing 2D perspective diagram according to an embodiment of the invention;
Fig. 7 defines schematic diagram according to the X-Z plane of the present invention's specific embodiment or the deposited distance of Y-Z plane;
Fig. 8 is the deposited distance definition schematic diagram according to the X-Y plane of the present invention's specific embodiment;
Fig. 9 produces and processing method schematic diagram according to the non-triangle dough sheet of the present invention's specific embodiment;
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 the present invention's specific embodiment compensates schematic diagram.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Describe below in conjunction with accompanying drawing and spray according to the binding agent of the embodiment of the present invention infiltration error compensating method increasing material and manufacture.
Fig. 2 is the flow chart increasing the error compensating method that material manufactures according to an embodiment of the invention.As shown in Figure 2, the method comprises the following steps:
Step S101, read the model data of part, set up the three-dimensional digital model of part according to the tri patch in model data, the surface that three-dimensional digital model is made up of at least four tri patch is formed.Wherein, in one embodiment of the invention, the three-dimensional digital model of part has the topological relation in dotted line, some face and line face.In other words, namely this step has the triangular surface patch grid of topology information according to original tri patch data genaration.It should be noted that, this process does not do any conversion process to data, only extracts the topological relation in dotted line, some face and line face, in the coordinate transformation process of subsequent step, keeps the correctness of model data.
Step S102, arranges an independently error correction side-play amount to each tri patch, and this error correction side-play amount is determined by the semielliptical shape of the normal vector of tri patch and the sedimentation unit of this tri patch present position.Wherein, in one embodiment of the invention, such as, the size of error correction side-play amount is determined by anisotropic sedimentation unit semielliptical shape, the error correction side-play amount of diverse location is not etc., the error correction side-play amount of the tri patch that face normal vector is different not etc., wherein sedimentation unit semielliptical be increase material manufacture in minimum material stacking cell cube, its shape is the semiellipsoid do not waited along X/Y/Z tri-axle radius.Further, in some instances, the definition of error correction side-play amount is such as the distance in the face that the stacking enveloping surface of the sedimentation unit semielliptical of current tri patch position is formed to sedimentation unit semielliptical centre of sphere line.As concrete example, Fig. 4 (a) and Fig. 4 (b) illustrates the signal of sedimentation unit error.Fig. 7 (a) and Fig. 7 (b) and Fig. 7 (c) illustrates the definition signal of deposited distance in X-Z plane or Y-Z plane.8 (a) and Fig. 8 (b) illustrate deposited distance definition signal on X-Y plane.
Particularly, such as, shown in Fig. 7, if error correction side-play amount is d, the face normal vector of current tri patch is (unit vector, mould is 1), the centre of sphere of sedimentation unit ellipsoid to the deposition vector at enveloping surface point of contact is then deposited distance is the projector distance of deposition vector on normal vector direction, face, that is:
If the size of deposition errors on X/Y/Z tri-directions is respectively e x, e y, e z, then the analytic equation of sedimentation unit ellipsoid is:
x 2 e x 2 + y 2 e y 2 + z 2 e z 2 = 1 ,
Then on sedimentation unit ellipsoid, the normal vector of any point is:
Order
n x 2 x e x 2 = n y 2 y e y 2 = n z 2 z e z 2 = k ,
Can obtain:
x 0 = 1 2 k e x 2 n x y 0 = 1 2 k e y 2 n y z 0 = 1 2 k e z 2 n z , k = 1 2 e x 2 n x 2 + e y 2 n y 2 + e z 2 n z 2 ,
I.e. point of contact coordinate (x 0, y 0, z 0), then deposit vector for:
Therefore, can be in the hope of error correction side-play amount d:
It can thus be appreciated that, the independent error correction side-play amount of each tri patch is only relevant with the face normal vector of tri patch to the deposition errors amount (i.e. three axle radiuses of ellipsoid) in X/Y/Z tri-directions, and its error correction side-play amount of tri patch that face normal vector is not identical is different.
Step S103, to all tri patch of the three-dimensional digital model of constituent part, be biased by the inside of set each self-corresponding independent error correction side-play amount to part, obtain the 3-dimensional digital correction model of part, and keep the stream shape character of the 3-dimensional digital correction model of part.Specifically, this step comprises further: form polygonal patch (also i.e. plane polygon) after each tri patch and the coupled and tri patch (may not exist) that direction vector is equal (equidirectional) being merged, and the internal direction of this polygonal patch to part is biased, concrete amount of bias is each self-corresponding error correction side-play amount.It should be noted that, in biased process, keep the topological relation between tri patch.As concrete example, Fig. 5 illustrates the signal of sedimentation unit form.
Further, in one embodiment of the invention, in step s 103, such as also comprise: carry out triangle division according to tri patch rule to intersecting the polygonal patch generated between adjacent triangular faces.Specifically, namely correctness verification is carried out to the form of model data corresponding to all tri patch obtained, comprise the correctness verification of topological relation and face normal vector, three-dimensional grid model correctly complete after finally obtaining error compensation process, the 3-dimensional digital correction model of also namely final part.
Wherein, in one embodiment of the invention, above-mentioned carries out triangle division according to tri patch rule to intersecting the polygonal patch generated between adjacent triangular faces, specifically comprise: first need to ask for each tri patch and be biased intersection that is rear and adjacent triangular faces, and carry out triangle division to intersecting the polygonal patch not meeting tri patch rule caused, make it to meet tri patch rule.Wherein, during intersection with adjacent triangular faces after asking for each tri patch and being biased, adjoin tri patch because adjacent triangular faces comprises connect tri patch and summit of adjacent side, therefore each tri patch biased after crossingly with adjacent triangular faces comprises the following two kinds situation:
The first: the tri patch that connects with adjacent side after each tri patch is biased is crossing, intersects and produces normal tri patch, ask for intersection.As concrete example, Fig. 6 illustrates the biased 2D of the intersecting perspective of tri patch and illustrates.
The second: adjoin tri patch with summit after each tri patch is biased crossing, now may produce the quad patch not meeting tri patch rule, the quad patch of generation is carried out tri patch division, make it to meet tri patch rule.As concrete example, Fig. 9 illustrates generation and the processing method signal of non-triangle dough sheet (as shape changeable dough sheet).
In another example, in above-mentioned steps S103, such as also comprise: each summit of error deviation correction to tri patch according to tri patch offsets, specifically comprise: ask for each summit and be biased the new summit of rear formation or multiple summit, tri patch division is carried out to the polygon that new summit or multiple summit are connected to form, makes it to meet tri patch rule.More specifically, above-mentionedly ask for each summit and be biased the new summit of rear formation or multiple summit, specifically comprise: the new summit obtained after each summit is biased comprises the following two kinds situation: can obtain a summit after each summit is biased, being now connected with other adjacent triangle produces normal tri patch; And each summit biased after obtain multiple summit, be now connected with other adjacent triangle the space polygon dough sheet that may produce and not meet tri patch rule, the space polygon dough sheet of generation carried out triangle division, makes it to meet tri patch rule.
Particularly, for the ease of understanding the offset manner of tri patch, such as by but be not limited to following example describe in detail, specifically comprise the following steps:
1. read a summit P in three-dimensional digital model 0=(x 0, y 0, z 0), obtain all tri patch T={T adjacent with it 1, T 2..., T m, the independently error correction side-play amount D={d of each tri patch can be obtained further 1, d 2..., d m.
2. set the new summit after skew as P=(x, y, z), it should meet each tri patch { T 1, T 2..., T mdistance be { d 1, d 2..., d m, if function Dis is (P, T i)=d irepresent that some P=(x, y, z) is to tri patch T idistance be d i, then:
D i s ( P , T 1 ) = d 1 D i s ( P , T 2 ) = d 2 ... D i s ( P , T m ) = d m .
First, if tri patch T ianalytic equation be A ix+B iy+C iz+D i=0, then all tri patch T={T 1, T 2..., T mcan be expressed as:
A 1 x + B 1 y + C 1 z + D 1 = 0 A 2 x + B 2 y + C 2 z + D 2 = 0 ... A m x + B m y + C m z + D m = 0 ,
Namely
MX＝b，
M = A 1 B 1 C 1 A 2 B 2 C 2 ... A m B m C m , b = - D 1 - D 2 ... - D m ,
Because some P 0=(x 0, y 0, z 0) obviously meet MX=b, so MX=b has unique untrivialo solution P 0=(x 0, y 0, z 0), the order of its coefficient matrix known equals the order of its augmented matrix, i.e. r (M)=r (Mb)=3.
For a P=(x, y, z) to tri patch { T 1, T 2..., T mdistance be respectively:
A 1 x + B 1 y + C 1 z + D 1 A 1 2 + B 1 2 + C 1 2 = d 1 A 2 x + B 2 y + C 2 z + D 2 A 2 2 + B 2 2 + C 2 2 = d 2 ... A m x + B m y + C m z + D m A m 2 + B m 2 + C m 2 = d m ,
Can obtain
A 1 x + B 1 y + C 1 z + D 1 - d 1 A 1 2 + B 1 2 + C 1 2 = 0 A 2 x + B 2 y + C 2 z + D 2 - d 2 A 2 2 + B 2 2 + C 2 2 = 0 ... A m x + B m y + C m z + D m - d m A m 2 + B m 2 + C m 2 = 0 ,
Namely
MX＝b'，
M = A 1 B 1 C 1 A 2 B 2 C 2 ... A m B m C m , b ′ = d 1 A 1 2 + B 1 2 + C 1 2 - D 1 d 2 A 2 2 + B 2 2 + C 2 2 - D 2 ... d m A m 2 + B m 2 + C m 2 - D m .
Now, if the order r of augmented matrix (Mb')=3, then, namely there is some P=(x, y, z) and meet the distance of each tri patch for { d in r (M)=r (Mb')=3 1, d 2..., d m, this time point P=(x, y, z) can be able to obtain by separating Linear Equations MX=b'; If r (Mb') >3, then there is not an independent point and meet the distance of each tri patch for { d 1, d 2..., d m, now divide some groups by m tri patch, the order r (M of the augmented matrix that each is organized ib i')=3, and obtain the solution P of each group of Linear Equations respectively i=(x, y, z), and each is separated P ithe maximum convex closure polygon that=(x, y, z) is formed carries out tri patch, makes it meet tri patch rule.
3. execution above-mentioned steps 1 and step 2 process each summit of three-dimensional digital model successively.Each tri patch in the new three-dimensional digital model of now gained meets separately independently error correction side-play amount.
4. tri patch skew is complete.
Step S104, utilizes the 3-dimensional digital correction model of part, directly carries out the control of layering and every layer of increasing material manufacture deposition path, drives follow-up increasing manufacture process process.In other words, as shown in Figure 3, namely layering is carried out to the 3-dimensional digital correction model (namely finally complete three-dimensional grid model) of the part obtained, and generate follow-up increasing material manufacture driving data, to drive follow-up increasing manufacture process process according to layering result.It should be noted that, this process, without the need to carrying out any compensation, eliminates the concept of profile live width, directly can generate follow-up increasing material and manufacture driving data.
Specifically; in the examples described above; determine the size of error correction side-play amount; first by experiment or theoretical modeling obtain minimal deposition element form; minimal deposition element form is a semielliptical shape in theory; equatorial radius a, the b of ellipsoid and polar radius c parameter are X-direction deposition, Y-direction deposition and Z-direction deposition, and three is determined by actual deposition situation.Generally, the unhindered settling increasing sedimentation unit in wealth manufacture process is individual each to different forms, and equatorial radius a and b is usually very close, and polar radius c is generally less than equatorial radius a, b, such as, shown in Fig. 5.
In one embodiment of the invention, determining to ooze in the process of error correction side-play amount, error such as comprises error that minimal deposition unit volume causes and/or the error that production technology causes, as the thickness of coating layer error of particular surface in PCM technique.More specifically, in some instances, following step is such as comprised to the process that each tri patch arranges an independently error correction side-play amount:
Step a: the mathematics physics model setting up deposition process, provides the theoretical error side-play amount of sedimentation unit.
Step b: use theoretical error side-play amount as error compensation foundation, directly carry out error compensation, and manufacture actual parts model.
Step c: the scale error measuring actual parts model, corrects theoretical error side-play amount, obtain final error correction side-play amount.
Further, in actual production technical process, also comprise after step c:
Steps d: use final error correction side-play amount as error compensation foundation, carry out error compensation, obtain the model data of the tri patch eventually passing through error compensation, and then obtain the three-dimensional grid model of final part.
To sum up, according to the error compensating method that the increasing material of the embodiment of the present invention manufactures, tringle coal data are adopted to process as source data, be biased by carrying out independently error correction to the position of each tri patch, according to the error of zones of different and the mistake extent of the same area different directions, alignment error entangles positively biased amount, processes all tri patch with this, achieves the anisotropic error compensation based on tringle coal data.Therefore, the method can reduce the anisotropic scale error caused because of the anisotropic size of sedimentation unit, improves the precision and forming quality that increase material manufacture.
Be described below in conjunction with the error compensating method of specific embodiment to the increasing material manufacture of the above embodiment of the present invention.
Embodiment 1
The mode increasing material manufacture has a lot, and typical a kind of mode is that binding agent sprays the manufacture of increasing material.
For the ease of understanding, in the present embodiment, spray for binding agent and increase material manufacture, the error compensating method of the increasing material manufacture of the above embodiment of the present invention is described further.
In the present embodiment, binding agent sprays the infiltration error compensating method increasing material and manufacture, and specifically comprises the following steps:
Step a: the model data reading part, set up the three-dimensional digital model of part according to the tri patch in model data, the surface that three-dimensional digital model is made up of at least four tri patch is formed.Wherein, the three-dimensional digital model of part has the topological relation in dotted line, some face and line face.
Step b: arrange one to each tri patch and independently permeate error correction side-play amount, this infiltration error correction side-play amount is determined by the normal vector of tri patch and the infiltration semielliptical of this tri patch present position.Wherein, the size of infiltration error correction side-play amount is determined by anisotropic infiltration semielliptical, the infiltration error correction side-play amount of diverse location is not etc., not etc., wherein permeate semielliptical is not the semielliptical that binder liquid drips the X/Y/Z tri-axle radius that permeates formation in the powder and do not wait to the unilateral infiltration error correction side-play amount of the different triangle of face normal vector.Further, permeate error correction side-play amount and be defined as the distance of the stacking enveloping surface of the binding agent infiltration semielliptical of current tri patch position to the face of binding agent infiltration semielliptical centre of sphere line formation.
Step c: to all tri patch of the three-dimensional digital model of constituent part, be biased by the inside of set each self-corresponding independent infiltration error correction side-play amount to part, obtain the 3-dimensional digital correction model of part, and keep the stream shape character of the 3-dimensional digital correction model of part.
Steps d: the 3-dimensional digital correction model utilizing part, directly carries out the path clustering of layering and the injection of every layer binder, drives follow-up increasing manufacture process process.
Specifically, spray increase in material manufacture process at binding agent, the process of data generally comprises the process that the modeling process of tringle coal, delaminating process and error compensation generate bitmap.And in the present embodiment, before tringle coal layering, carry out infiltration error compensation, without the need to considering error compensation problem again after layering.In data processing, first obtain tringle coal data, then carry out infiltration error compensation to tringle coal, last direct layering generates the driving data being used for follow-up increasing material and manufacturing.
Embodiment 2
In the present embodiment, spray the error compensating method increasing material and manufacture for binding agent, concrete operating process is as follows:
1 equipment: binding agent sprays and increases material manufacturing equipment and other necessary part, have selected the PCM technology of machinery system of Tsing-Hua University research and development in this example.
2 data: sample tringle coal are square model, such as, shown in Figure 10 (a) He Figure 10 (b).
3 experiment purposes: infiltration error compensation is carried out to sample model with the infiltration error compensating method based on tringle coal.
4 implementation steps:
A: carry out reconstruction of Topological Relation to sample tringle coal data, and repair Topology Error, generates three-dimensional grid model.
B: according to theoretical saturated model, carries out theory infiltration error compensation to three-dimensional grid model.
C: layering is carried out to three-dimensional grid model, and carry out entity manufacture.
D: measure the material object parts scale error manufactured, revises theory infiltration error, obtains actual infiltration error compensation amount.
E: carry out infiltration error compensation, the tringle coal data after being compensated according to reality infiltration error compensation amount.As concrete example, as shown in figure 11, XY plane plan view, such as dough sheet F1, the error compensation amount of F2, F3 is d 1, d 2, d 3, different, all dough sheets are biased according to respective error deviation amount, are compensated rear three-dimensional grid model, if the lines of inner side in XY top view are for compensating rear model boundary.As another object lesson, such as shown in Figure 12, for spheroid, illustrate infiltration error anisotropy and compensate (three-dimensional Unequal distance compensation) signal, can find out, the error compensation amount (also namely permeating error correction side-play amount) of different dough sheet is different.
F: layering is carried out to the tringle coal data after compensating, generates data bitmap, normally increase material manufacture for reality.
Therefore, as can be seen from the above embodiments, method of the present invention improves binding agent and sprays the data processing method increasing material manufacturing technology, and improves the precision of shaping and the quality of formation of parts, reduces because permeating the anisotropic scale error caused.The development increasing material manufacturing technology is sprayed to binding agent there is very large facilitation, there is very high economic worth.
To sum up, the cardinal principle that the binding agent that above-described embodiment describes sprays the infiltration error compensating method increasing material manufacture can be summarized as: obtain primary model data, the infiltration error correction side-play amount of the correspondence of each tri patch is determined according to region and position, the i.e. displacement bias amount of three apex coordinates, the biased direction of each tri patch is the internal direction of part.Subsequently corresponding infiltration error correction side-play amount is asked for each tri patch, translation is implemented to tri patch, crossing process is carried out to the tri patch after translation and adjacent triangular faces, it is made to meet tri patch data rule, finally obtain all tri patch be biased after three-dimensional grid model data, be the 3-dimensional digital correction model after compensation.Then the binding agent implemented as shown in Figure 2 sprays the step S104 increasing material manufacture process, this process is without the need to carrying out error compensation to data again, namely profile live width is no longer needed to compensate, and Z-direction compensating operation, can directly generate for driving the follow-up increasing wealth increasing manufacture process process to manufacture driving data.
To sum up, the binding agent that above-described embodiment describes sprays the infiltration error compensating method increasing material and manufacture, original tringle coal data are adopted to process as source data, be biased by independently permeating error correction to the position of each tri patch, according to the infiltration error of zones of different and the infiltration extent by mistake of the same area different directions, alignment error entangles positively biased amount, process all tri patch with this, achieve the anisotropic infiltration error compensation based on tringle coal data.Therefore, the method can reduce the anisotropic scale error caused because of the anisotropic infiltration of binding agent, improves binding agent and sprays the precision and forming quality that increase material manufacture.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, 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 can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.

Claims (10)

1. increase the error compensating method that material manufactures, it is characterized in that, comprise the following steps:
Read the model data of part, set up the three-dimensional digital model of part according to the tri patch in described model data, the surface that described three-dimensional digital model is made up of at least four tri patch is formed;
Arrange an independently error correction side-play amount to described each tri patch, described error correction side-play amount is determined by the semielliptical shape of the normal vector of described tri patch and the sedimentation unit of described tri patch present position;
To all tri patch of the three-dimensional digital model of the described part of formation, be biased by the inside of set each self-corresponding independent error correction side-play amount to part, obtain the 3-dimensional digital correction model of part, and keep the stream shape character of the 3-dimensional digital correction model of described part;
Utilize the 3-dimensional digital correction model of described part, directly carry out the control of layering and every layer of increasing material manufacture deposition path, drive follow-up increasing manufacture process process.
2. the error compensating method of increasing material manufacture according to claim 1, it is characterized in that, the size of described error correction side-play amount is determined by anisotropic sedimentation unit semielliptical shape, the error correction side-play amount of diverse location is not etc., the error correction side-play amount of the tri patch that face normal vector is different is not etc., wherein sedimentation unit semielliptical is increase the minimum material stacking cell cube in material manufacture, and its shape is the semiellipsoid do not waited along X/Y/Z tri-axle radius.
3. the error compensating method that manufactures of increasing material according to claim 1, is characterized in that, the three-dimensional digital model of described part has the topological relation in dotted line, some face and line face.
4. the error compensating method spraying increasing material and manufacture according to claim 1, it is characterized in that, described error correction side-play amount is defined as the distance in the face that the stacking enveloping surface of the sedimentation unit semielliptical of current tri patch position is formed to sedimentation unit semielliptical centre of sphere line.
5. the error compensating method of increasing material manufacture according to claim 1, it is characterized in that, all tri patch of the described three-dimensional digital model to the described part of formation, by set each self-corresponding independent error correction side-play amount to the internal bias of part, comprise further:
By each tri patch and to be adjacent and the equal tri patch of direction vector carries out merging to form polygonal patch, the inside of described polygonal patch to described part is biased.
6. the error compensating method of increasing material manufacture according to claim 5, is characterized in that, also comprise: carrying out triangle division according to tri patch rule to intersecting the polygonal patch generated between adjacent triangular faces, specifically comprising:
Ask for described each tri patch and be biased intersection that is rear and adjacent triangular faces, and carry out triangle division to intersecting the polygonal patch not meeting tri patch rule caused, make it to meet tri patch rule.
7. the error compensating method of increasing material manufacture according to claim 6, is characterized in that, asks for described each tri patch and is biased intersection that is rear and adjacent triangular faces, comprise further:
Described adjacent triangular faces comprises connect tri patch and summit of adjacent side and adjoins tri patch, crossingly with adjacent triangular faces after described each tri patch is biased comprises the following two kinds situation:
The tri patch that connects with adjacent side after described each tri patch is biased is crossing, intersects and produces normal tri patch, ask for intersection; And
Adjoin tri patch with summit after described each tri patch is biased crossing, now may produce the quad patch not meeting rule, the quad patch of generation be carried out tri patch division, makes it to meet tri patch rule.
8. the error compensating method of increasing material manufacture according to claim 5, is characterized in that, also comprise: each summit of error deviation correction to described tri patch according to tri patch offsets, and specifically comprises:
Ask for described each summit and be biased the new summit of rear formation or multiple summit, tri patch division is carried out to the polygon that described new summit or multiple summit are connected to form, make it to meet tri patch rule.
9. the error compensating method of increasing material manufacture according to claim 8, is characterized in that, ask for described each summit and be biased the new summit of rear formation or multiple summit, comprise further:
The new summit obtained after described each summit is biased comprises the following two kinds situation:
Can obtain a summit after described each summit is biased, being now connected with other adjacent triangle produces normal tri patch; And
Obtain multiple summit after described each summit is biased, be now connected with other adjacent triangle the space polygon dough sheet that may produce and not meet tri patch rule, the space polygon dough sheet of generation carried out triangle division, makes it to meet tri patch rule.
10. the error compensating method that manufactures of increasing material according to claim 1, is characterized in that, described error comprises error that minimal deposition unit volume causes and/or the error that production technology causes.
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