CN107775956A - A kind of method in the optimization profile scan path for increasing material manufacturing - Google Patents
A kind of method in the optimization profile scan path for increasing material manufacturing Download PDFInfo
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- CN107775956A CN107775956A CN201610744439.4A CN201610744439A CN107775956A CN 107775956 A CN107775956 A CN 107775956A CN 201610744439 A CN201610744439 A CN 201610744439A CN 107775956 A CN107775956 A CN 107775956A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005457 optimization Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000284 extract Substances 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000000717 retained effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 6
- 238000007493 shaping process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000007639 printing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0212—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory
- G05D1/0217—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory in accordance with energy consumption, time reduction or distance reduction criteria
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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Abstract
A kind of method in the optimization profile scan path for increasing material manufacturing is disclosed in the present invention, including：S1 extracts the information of the point of the tri patch on one layer of the STL models after layering；Three continuity points A1, B1 and the C1 of the original position extraction of S2 self demixing profiles thereon；S3 obtains B1 points to the distance H of A1 and C1 point lines；H values and selected tolerance value θ are carried out size comparison by S4；S5 retains B1 points, and the starting point calculated using B1 points as a new round, repeat step S1 to S5 when H values are more than θ；When H values are less than or equal to θ, delete B1 points, and the starting point calculated using C1 points as a new round, S1 is repeated to S5 steps, it selects tolerance value θ according to user for the quality requirement after Workpiece shaping, and the partial dot on layering profile is removed according to the tolerance value, shaggy phenomenon caused by intensive place is being put to improve laser delay, and shorten process time simultaneously.
Description
Technical field
It is more particularly to a kind of to be used to increase material system the present invention relates to the generation method of laser beam scan path in increases material manufacturing technology
The method in the optimization profile scan path made.
Background technology
Increasing material manufacturing, also known as rapid shaping or 3D printing, it is to utilize existing CAD/CAM Software Creates entity component
Threedimensional model, and by Slice Software by its " cutting " into some lamellas, then successively powdering, sintering are final prints and three
The consistent entity of dimension module.Processing of this mode for being successively superimposed printing especially suitable for some complex parts, especially one
A little parts have complicated inside die cavity, when die cavity sheet is as closing or semi-closed structure, even state-of-the-art five axle
Machining tool is also difficult to, and now, its incomparable advantage is just showed in successively printing for increasing material manufacturing.
, it is necessary to plan laser beam scan path before successively printing is carried out, to enter after powdering according to drafting path
Row constituency sinters, and is sintered powder and is formed by curing final entity.In increasing material manufacturing, for planning laser beam scan path
The form of model is generally STL forms, and its mode stored in a computer is the mode of tri patch, and each triangular facet
The information unit facet of piece is a tri patch with direction vector, therefore, a plurality of straight line on each face be present, these
Straight line is after section, and being under the jurisdiction of the summit of the triangle lamellar body on different layers can fall on the layer after section, and this may result in one
Multiple noise spots, the even intensive point set of noise spot on individual straight line be present；And stl file is during reparation, due in the presence of one
The mistakes such as some holes hole, summit dislocation, when repairing stl file, repair process can cause the Light deformation of entity in itself, this micro- change
The summit that shape can produce some multiple tri patch after section connects the near linear to be formed；And when model surface accuracy compared with
Gao Shi, more more intensive point be present on the contour line after section.
Final result caused by above three reason is more point be present on each layer of contour curve after layering, and
The path of post laser scanning, it is exactly the broken line that these points are in turn connected to form.Laser when being scanned on powder bed, each
The position of point can once be paused, and this may result in, and roughness at the point is poor, and for the part after printing, surface is thick
Rugosity must is fulfilled for requirement, however, when the point on contour line is excessively intensive, the pause point of laser can be in a close quarters
Concentrate, cause the surface quality of part corresponding site very poor, it is difficult to meet the needs of user is for shaped article.
The content of the invention
It is an object of the invention to provide a kind of method in the optimization profile scan path for increasing material manufacturing, it is according to work
The selected tolerance value of form error requirement after part shaping, and the partial dot on layering profile is removed according to the tolerance value, to improve
The coarse phenomenon of the caused local surfaces of intensive place's concentration is being put in laser delay.
The present invention above-mentioned purpose technical scheme is that：A kind of optimization wheel for increasing material manufacturing
The method of wide scanning pattern, including：
S1 extracts the information of the point of the tri patch on one layer of the STL models after layering；
Three continuity points A1, B1 and the C1 of the original position extraction of S2 self demixing profiles thereon；
S3 obtains B1 points to the distance H of A1 and C1 point lines；
The maximum allowance value θ that H values allow with setting is carried out size comparison by S4；
S5 retains B1 points, and the starting point calculated using B1 points as a new round, repeat step S1 to S5 when H values are more than θ；When H values
During less than or equal to θ, B1 points, and the starting point calculated using C1 points as a new round are deleted, repeats S1 to S5 steps.
By using above-mentioned technical proposal, first, after part is separated by layer, the contour line on each layer is pressed for whole
Be linked in sequence the broken line to be formed, and the length of broken line depends on the distance between two end points of broken line, and the length of broken line determines
The shape and precision of contour line, then required according to actual processing part its difference, after selecting maximum allowance value θ, you can sentence
It is disconnected to delete whether point influence the contour shape of forming part, that is, some points are deleted in maximum allowance value θ allowed band,
It is the contour shape for not interfering with final part, meanwhile, the closeness of point is greatly diminished, and makes laser beam in a region
Interior pause number is reduced, and is remarkably improved the surface quality of forming part；At the same time, the scanning pattern of laser beam simplifies
Afterwards, the pause number of laser beam significantly reduces, and therefore, the time required for profile scan after subtracting a little can be greatly shortened；
When computer carries out subtracting point processing, it was iterated computing as a unit using three o'clock and subtract a little, be quite suitable for complicated wheel
The operating mode of profile.
Further, acquisition B1 points to the distance H of A1 and C1 point lines method are in step S3：It is sequentially connected with A1, B1
With tri- points of C1 to form a triangle, the vertical line on side where doing B1 points to A1 and C1 points, the intersection point of vertical line and straight line A1C1
D1 points are set to, then the distance between B1 and DI points are H values.
By using above-mentioned technical proposal, the B1 points done are to the vertical line of A1 and C1 point lines, the company between B1 and intersection point
Line length is distance H of the B1 points to A1 and C1 point lines, and this distance H and roughness allowable tolerance value θ are compared, you can
To know whether the choice of B1 points can influence the net shape of contour line, not only computational methods are simple, and effect is reliable, also, this
Kind manner of comparison with computer software quite convenient for being iterated computing, to obtain higher data-handling efficiency.
It is another object of the present invention to provide a kind of method in the optimization profile scan path for increasing material manufacturing, its
According to the quality requirement selection tolerance value after Workpiece shaping, and the partial dot on layering profile is removed according to the tolerance value, to change
Shaggy phenomenon caused by intensive place is being put in kind laser delay, and shortens process time simultaneously.
The present invention above-mentioned purpose technical scheme is that：A kind of optimization wheel for increasing material manufacturing
The method of wide scanning pattern, including：
S1 extracts the information of the point of the tri patch on one layer of the STL models after layering；
Three continuity points A1, B1 and the C1 of the original position extraction of S2 self demixing profiles thereon；
Maximum allowance the value θ, tie point A1 and C1 that S3 settings allow are to form straight line A1C1, and at straight line A1C1 θ pair
Claim two parallel lines of the picture parallel to straight line A1C1；
S4 is retained B1 points and the starting point calculated using B1 points as a new round, repeated when the region between B1 exceeds two parallel lines
Step S1 to S4；When B1 points fall at two it is parallel between region when, delete B1 points, and using C1 points be a new round calculate
Point, S1 is repeated to S4 steps.
By using above-mentioned technical proposal, using A1 and C1 line as symmetry axis, after drawing two parallel lines as distance using θ,
Check that B1 points would know that whether B1 points impact to profile wire shaped in the which side of parallel lines, without meter under this mode
Concrete numerical value is calculated, can further improve the formation speed of scanning pattern.
In summary, the invention has the advantages that：According to the form accuracy in actual processing for forming part
It is required that setting maximum allowance value and using it as basis for estimation, the choice to the intermediate point of continuous three points on contour curve
Whether influence final profile wire shaped to be judged, if not influenceing, respective point is deleted to reduce density a little, if influenceing
Judge that the point accurately generates necessary point for contour curve, it is retained, it is possible to achieve do not influenceing forming part
On the premise of profile wire shaped, delete unnecessary point, reduce the dense degree of the point of contour line, so as to decrease or even eliminate because
Laser stagnate in caused by a certain region is long forming part surface quality reduce the problem of, while make laser scanning path letter
Change, obtain higher processing efficiency.
Brief description of the drawings
Fig. 1 is that the caused point of tri patch in stl file is intensive；
Fig. 2 is certain straight line outline line being layered in later layer；
Fig. 3 be stl file reparation caused by the near linear that is formed after section of plane deformation；
Fig. 4 be due to surface accuracy it is too high caused by one layer after the section upper curve point that is formed it is excessive；
Fig. 5 is that the first of broken-line type contour line subtracts point mode principle；
Fig. 6 is that the first of curve wheel profile subtracts point mode principle；
Fig. 7 is to subtract point mode principle second of broken-line type contour line；
Fig. 8 is to subtract point mode principle second of curve wheel profile；
Fig. 9 is the contour optimization method block diagram described in embodiment 1；
Figure 10 subtracts a schematic diagram judged twice in the case of being and use the method intermediate point in embodiment 1 to be deleted；
Figure 11 subtracts a schematic diagram judged twice in the case of being and use the method intermediate point in embodiment 1 to be retained；
Figure 12 is the contour optimization method block diagram described in embodiment 2；
Figure 13 subtracts a schematic diagram judged twice in the case of being and use the method intermediate point in embodiment 2 to be deleted；
Figure 14 subtracts a schematic diagram judged twice in the case of being and use the method intermediate point in embodiment 2 to be deleted.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment 1
A kind of method in optimization profile scan path for increasing material manufacturing, as shown in fig. 1, is carried out to the STL models of part
One layer after section as shown in fig. 1, because the form of STL three-dimensional entity models is triangle sheet form, the part mould after section
The problem of existing on the contour line of type more than three kinds of points as shown in Fig. 2 to 4 and concentrating：The profile of Fig. 2 middle position form of straight lines
More and more intensive situation is put on line；Fig. 3 is stl file caused plane deformation when repairing triangular plate body, after section
Formed broken line form point is more and intensive phenomenon；Fig. 4 be surface accuracy it is too high caused by slicing profile curve point it is excessive and
More intensive phenomenon.
For more than the point shown in Fig. 2 and Fig. 3 and intensive phenomenon, providing one kind with initial reference to Fig. 5 and subtracting point mode, with optimization
Contour path.Using three o'clock as one group, three points are connected, form the triangle shown in a Fig. 5（When contour shape is Fig. 2
Shown in straight line when, can be regarded as triangle three sides overlap）, vertical line is done by the line of intermediate point to the point on both sides, in
Between point to the distance of intersection point be H.
With reference to the form accuracy requirement to final molding part, a maximum allowable tolerance value θ is set, when H values are more than θ
When, it is possible to determine that, influence of second point for contour shape is more than the maximum allowance that contour shape allows, that is to say, that the
Two points are the necessary point that contour shape is formed, and should be retained；When H values are less than θ, part wheel will not also be made by deleting second point
This wide position exceedes the maximum allowance allowed, that is, deletes influence of second point for contour shape and can be neglected, can
To delete.So, for form of straight lines point more than and it is intensive in the case of, visual H values are 0, can directly be deleted between two-end-point
Whole points.Similar therewith, as shown in Figure 6, the contour curve of form of arcs subtracts a principle as hereinbefore.
Subtract point methods according to above-mentioned, reference picture 9 provides the specific method of contour curve optimization：
S1 is using the end points of contour line as first point, sequentially continuous three points on contouring line；
S2 connects three points with reference to the above method and forms a triangle；
S3 does vertical line using intermediate point as starting point, to two end point connecting line and obtains intersection point；
S4 obtains the line segment length H between intersection point and intermediate point；
S30 input maximum allowance values θ；
S5 judges H and θ magnitude relationship, as H ＞ θ, into step S6, otherwise carries out step S61；
S6 deletes intermediate point and enters step S60；
S60 picks up three points, and repeat step S1/S2/S3/S4/ again using second point of remaining two points as starting point
S30/S4 and S5；
S61 retain intermediate point, and the starting point using it as next group of three points, and repeat step S1/S2/S3/S4/S30/S4 with
And S5.
Under the above method, subtract point process as shown in FIG. 10 and 11, Figure 10 is that H values are less than θ, deletes the situation of intermediate point；
Figure 11 is that H values are more than θ, retains intermediate point and the situation using it as next group of point starting point.
Embodiment 2
It is same as Example 1 as shown in Fig. 7 to 8, three continuous points are taken from contour line, connect the point at both ends, using θ as
Distance, 2 lines are the parallel lines that symmetry axis does 2 lines, if intermediate point falls in the region between two parallel lines, its
Subtract point process with H values less than as θ, delete intermediate point；If region of the intermediate point between two parallel lines, it subtracts point process
As being more than θ with H values, now need to retain intermediate point.
In this way, reference picture 12 provides the specific method of contour curve optimization：
S1 is using the end points of contour line as first point, sequentially continuous three points on contouring line；
S2 joins two endpoints to form straight line；
S30 input maximum allowance values θ；
S3 draws two parallel lines apart from straight line θ distances in its both sides using the straight line in S2 as symmetry axis；
S4 judges whether intermediate point falls the region between two parallel lines；
S5 point midways delete intermediate point, into step S61 between two parallel lines；
S60 intermediate points region between two parallel lines, retain intermediate point, and the starting point using it as next group of three points,
Repeat step S1/S2/S3/S4/S30/S4；
S61 is using second point in remaining two points as starting point, repeat step S1/S2/S3/S4/S30/S4.
Under the above method, subtract point process as shown in Figs. 13 and 14, Figure 13 is between without departing from two parallel lines of intermediate point
Region, delete the situation of intermediate point；Figure 14 is intermediate point region between two parallel lines, retains intermediate point and using it under
The situation of the starting point of one group of point.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Claims (3)
1. a kind of method in optimization profile scan path for increasing material manufacturing, it is characterized in that, including：
S1 extracts the information of the point of the tri patch on one layer of the STL models after layering；
Three continuity points A1, B1 and the C1 of the original position extraction of S2 self demixing profiles thereon；
S3 obtains B1 points to the distance H of A1 and C1 point lines；
The maximum allowance value θ that H values allow with setting is carried out size comparison by S4；
S5 retains B1 points, and the starting point calculated using B1 points as a new round, repeat step S1 to S5 when H values are more than θ；When H values
During less than or equal to θ, B1 points, and the starting point calculated using C1 points as a new round are deleted, repeats S2 to S5 steps.
2. a kind of method in optimization profile scan path for increasing material manufacturing according to claim 1, it is characterized in that, step
Acquisition B1 points to the distance H of A1 and C1 point lines method are in rapid S3：Tri- points of A1, B1 and C1 are sequentially connected with to form one
Triangle, do B1 points to the vertical line on side where A1 and C1 points, the intersection point of vertical line and straight line A1C1 and be set to D1 points, then B1 and DI points it
Between distance be H values.
3. a kind of method in optimization profile scan path for increasing material manufacturing, it is characterized in that, including：
S1 extracts the information of the point of the tri patch on one layer of the STL models after layering；
Three continuity points A1, B1 and the C1 of the original position extraction of S2 self demixing profiles thereon；
Maximum allowance the value θ, tie point A1 and C1 that S3 settings allow are to form straight line A1C1, and at straight line A1C1 θ pair
Claim two parallel lines of the picture parallel to straight line A1C1；
S4 is retained B1 points and the starting point calculated using B1 points as a new round, repeated when the region between B1 exceeds two parallel lines
Step S1 to S4；When B1 points fall at two it is parallel between region when, delete B1 points, and using C1 points be a new round calculate
Point, S2 is repeated to S4 steps.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108556365A (en) * | 2018-03-12 | 2018-09-21 | 中南大学 | A kind of composite filled optimization method and system of rapidform machine |
| CN111044532A (en) * | 2018-10-15 | 2020-04-21 | 立普思股份有限公司 | Processing method using depth image detection |
| CN112846232A (en) * | 2020-12-31 | 2021-05-28 | 南京英尼格玛工业自动化技术有限公司 | Multi-layer and multi-channel arc additive automatic trajectory planning method and system for metal structure |
| CN114101861A (en) * | 2021-11-02 | 2022-03-01 | 北京航星机器制造有限公司 | Arc additive manufacturing off-line programming method with editable local path points |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108556365A (en) * | 2018-03-12 | 2018-09-21 | 中南大学 | A kind of composite filled optimization method and system of rapidform machine |
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| CN111044532A (en) * | 2018-10-15 | 2020-04-21 | 立普思股份有限公司 | Processing method using depth image detection |
| CN112846232A (en) * | 2020-12-31 | 2021-05-28 | 南京英尼格玛工业自动化技术有限公司 | Multi-layer and multi-channel arc additive automatic trajectory planning method and system for metal structure |
| CN112846232B (en) * | 2020-12-31 | 2023-03-03 | 南京英尼格玛工业自动化技术有限公司 | Multi-layer and multi-channel arc additive automatic trajectory planning method and system for metal structure |
| CN114101861A (en) * | 2021-11-02 | 2022-03-01 | 北京航星机器制造有限公司 | Arc additive manufacturing off-line programming method with editable local path points |
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