CN103752823B - Triangular mesh type laser scanning method for selective laser sintering - Google Patents
Triangular mesh type laser scanning method for selective laser sintering Download PDFInfo
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- CN103752823B CN103752823B CN201310733109.1A CN201310733109A CN103752823B CN 103752823 B CN103752823 B CN 103752823B CN 201310733109 A CN201310733109 A CN 201310733109A CN 103752823 B CN103752823 B CN 103752823B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a triangular mesh type laser scanning method for selective laser sintering. The method comprises laser scanning paths in the section contour are calculated according to section contour information, and laser beams scan metal powder where the solid portion of a manufacturing part is disposed according to the scanning paths to manufacture a work-piece directly. According to the method, the whole part in a triangular mesh shape is formed eventually according to three groups of the linear scanning paths; the method is simple in technological control, high in practicality and capable of improving the manufacturing part strength, reducing the manufacturing part deformation and improving the manufacturing part size accuracy.
Description
Technical field
The present invention relates to material increasing field, specially a kind of triangulation network form laser for selective laser sintering is swept
Retouch method.
Background technology
Increasing material manufacturing (additive manufacturing), also referred to as quick shaping or rapid shaping (rapid
Prototyping, abbreviation rp), it is the new technique of a kind of quick manufacture part or model, be integrated with Numeric Control Technology, machinery sets
Meter and manufacture, new material technology and Computer Applied Technology, are the products of multidisciplinary synthesis.Increasing material manufacturing is commonly called as 3d and prints.
Selective laser sintering (selective laser sintering, abbreviation sls) technique is won by carl dechard
Tutor joe doctor beaman of scholar and Ta in 19th century the mid-80 develop in Texas ,Usa university Austin
Success, and carried out commercial development.Sls technology utilization dusty material shapes: material powder paving is sprinkled upon formed zero by (1)
The upper surface of part, and strike off；(2) scan part section with the co2 laser instrument of high intensity on the new layer of firm paving；(3) material
Powder is sintered together under the laser of high intensity irradiates, and obtains the section of part, and bonding with following formed part；
(4) after a layer cross section has sintered, spread new layer of material powder, selectively sinter lower layer cross section, if sweeping through dried layer
Retouch sintering superposition, finally complete whole prototype or the manufacture of workpiece.
In selective laser sintering manufacture process, its crudy Stimulated Light spot size, scanning speed, scanning room
Away from, scanning pattern, laser instrument send the factors such as laser energy impact.In process, when dusty material melting and solidification, by
Time sequencing difference in cooling can cause product non-uniform shrinkage so that the contraction of upper layer of material can make the lower floor being attached thereto
Material is acted on by compressive stress, and is cooling down and the upper layer of material shunk is because there is the constraint of subsurface material, and is drawn
The effect of stress, may result in the buckling deformation of molded layer, can crack when serious when this stress is serious, this is to select
Property laser sintered manufacture one of an international difficult problem.The temperature field that the scan mode of laser beam decides in processing aspect is divided
Cloth, therefore determines the degree of buckling deformation.
In selective laser sintering manufacture process, the filling scan mode adopting at present can be largely classified into parallel lines and sweeps
Retouch, profile equal space line scans and parallel lines and the hybrid scanning of profile equal space line.Using during hybrid scanning, interface profile
Border press profile equal space line scanning；Parallel line sweeping is pressed in inside.Parallel line sweeping only needs one axle motion of rapidform machine, sweeps
Retouch speed fast.And scanning algorithm is simple, so program is also relatively simple, easily realize.The application of Selective Laser Sintering
Scope constantly expands, and the evaluation criterions such as the precision of product is put forward higher requirement, further works out suitable laser
Beam scanning path, significant for the quality improving workpiece manufactured by selective laser sintering.
Content of the invention
It is an object of the invention to provide a kind of triangulation network form Laser Scanning for selective laser sintering, with reality
Reduce now the buckling deformation of product, while the precision of raising product, increase the intensity of product.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of triangulation network form Laser Scanning for selective laser sintering it is characterised in that: according to section take turns
Wide information, calculates the laser beam scan path in cross section profile, described laser beam scan path is three groups of parallel linear scannings
The triangulation network trellis entire scan path that path is constituted, every group of linear scanning path is made up of linear systematicness lines, swashs
Light beam under control of the computer, is scanned according to the metal dust that laser beam scan path is located to the solid section of product,
Directly produce workpiece.
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: every group
Interior lines are parallel to each other, and three groups of lines are arranged along three different directions respectively, intersecting between three groups of lines, form three after scanning
Angle latticed scanning track, in triangle gridding, each triangle is equilateral triangle.
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: laser
Scanning process is bundle under the control of the computer:
It is scanned along x/y axle by laser beam scan path by computer controls laser beam, produce a series of parallel with x/y axle
Scanning track；
It is scanned along along the direction becoming 60 ° with x/y axle by laser beam scan path by computer controls laser beam, produce one
Series becomes 60 ° of scanning track with x/y axle；
It is scanned along along the direction becoming 120 ° with x/y axle by laser beam scan path by computer controls laser beam, produce
A series of scanning tracks becoming 120 ° with x/y axle；
It is scanned along the cross section profile of workpiece by computer controls laser beam.
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: each
Scanning direction procedural order is in no particular order.
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: each
In scanning direction, adjacent path spacing is identical.
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: the 3rd
The intersection point through the first two scanning direction track for the individual scanning direction track
A kind of described triangulation network form Laser Scanning for selective laser sintering it is characterised in that: scanning
Track intersection point experiences three laser weldings.
The invention provides a kind of triangulation network form Laser Scanning for selective laser sintering, taken turns according to section
Wide information, laser beam under control of the computer, is scanned to the metal dust at the solid section place of product, scans road
Footpath is intersected, and finally constitutes the overall path of triangulation network trellis.Scanning pattern point of intersection obtains three laser weldings, for selectivity
The laser sintered combination degree that can improve adjacent layer.The present invention controls simply in technique, practical, can increase product
Intensity, reduces product deformation, improves whole product dimensional accuracy.
Brief description
Fig. 1 is the triangulation network trellis scanning pattern generating principle schematic diagram for selective laser sintering.
Fig. 2 is that the triangulation network trellis scanning pattern for selective laser sintering generates result schematic diagram.
Fig. 3 is that laser beam is scanned result schematic diagram along the x-axis direction.
Fig. 4 is that laser beam carries out scanning result schematic diagram along along the direction becoming 120 ° with x-axis.
Fig. 5 is that laser beam carries out scanning result schematic diagram along along the direction becoming 60 ° with x-axis.
Fig. 6 is laser beam along cross section contour scanning result schematic diagram.
Fig. 7 is the equal space line scanning result schematic diagram along cross section contour for the laser beam.
Fig. 8 is that laser beam carries out low resolution scanning result schematic diagram along the x-axis direction.
Fig. 9 is that laser beam carries out low resolution scanning result schematic diagram along along the direction becoming 120 ° with x-axis.
Figure 10 is that laser beam carries out low resolution scanning result schematic diagram along along the direction becoming 60 ° with x-axis.
Figure 11 is that laser beam is finely divided scanning result schematic diagram along the x-axis direction.
Figure 12 is that laser beam is finely divided scanning result schematic diagram along along the direction becoming 120 ° with x-axis.
Figure 13 is that laser beam is finely divided scanning result schematic diagram along along the direction becoming 60 ° with x-axis.
Figure 14 is laser beam along cross section contour scanning result schematic diagram.
Figure 15 is the equal space line scanning result schematic diagram along cross section contour for the laser beam.
Figure 16 be selective laser sintering triangle gridding form scan coordinates measurement in three layers of template interlaced arrangement illustrate
Figure.
Specific embodiment
A kind of triangulation network form Laser Scanning for selective laser sintering, according to the information of cross section profile, counts
Calculate the laser beam scan path in cross section profile, laser beam scan path is the triangulation network that three groups of parallel linear scanning paths are constituted
Trellis entire scan path, every group of linear scanning path is made up of linear systematicness lines, and laser beam is in the control of computer
Under system, it is scanned according to the metal dust that laser beam scan path is located to the solid section of product, directly produces workpiece.
Scanning process is laser beam under the control of the computer:
It is scanned along x/y axle by laser beam scan path by computer controls laser beam, produce a series of parallel with x/y axle
Scanning track；
It is scanned along along the direction becoming 60 ° with x/y axle by laser beam scan path by computer controls laser beam, produce one
Series becomes 60 ° of scanning track with x/y axle；
It is scanned along along the direction becoming 120 ° with x/y axle by laser beam scan path by computer controls laser beam, produce
A series of scanning tracks becoming 120 ° with x/y axle；
It is scanned along the cross section profile of workpiece by computer controls laser beam.
Each scanning process order is in no particular order.
In each scanning direction, adjacent path spacing is identical.
3rd intersection point through the first two scanning direction track for the scanning direction track
Scanning track intersection point experiences three laser weldings.
The invention mainly comprises step:
S1. the bounding box of the cross section profile according to product digital model, obtains equilateral triangle regular permutations and combinations
Template it is desirable to the boundary line of the template outside that is fully located at bounding box is as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain the template part within positioned at contour line,
I.e. entire scan path is as shown in Figure 2.
S3. according to entire scan path, it is scanned along x-axis by computer controls laser beam, produce a series of flat with x-axis
The scanning track of row is as shown in Figure 3.
S4. according to entire scan path, first swept along along the direction becoming 120 ° with x-axis by computer controls laser beam
Retouch, produce and a series of become with x-axis 120 ° of scanning track as shown in Figure 4.
S5. according to entire scan path, it is scanned along along the direction becoming 60 ° with x-axis by computer controls laser beam, produce
Life is a series of to become 60 ° and the scanning track by front twice sweep track intersection point is as shown in Figure 5 with x-axis.Due to scanning pattern phase
Hand over, these intersection points experience three laser weldings；
S6. it is scanned as shown in fig. 6, as needed can edge by computer controls laser beam along the cross section profile of workpiece
The equal space line of the cross section contour of workpiece is scanned (Fig. 7), improves product intensity further.
The parallel sweep orbit interval of produced all directions is identical, i.e. l1=l2=l3.
Embodiment one:
A kind of triangulation network form Laser Scanning for selective laser sintering, mainly includes step:
S1. the bounding box of the cross section profile according to product digital model, obtains equilateral triangle regular permutations and combinations
Template it is desirable to the boundary line of the template outside that is fully located at bounding box is as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain the template part within positioned at contour line,
I.e. entire scan path is as shown in Figure 2.
S3. according to entire scan path, laser scanning is carried out along x-axis by computer controls laser beam, produce a series of and x
The parallel scanning track of axle is as shown in Figure 3.
S4. according to entire scan path, first swept along along the direction becoming 120 ° with x-axis by computer controls laser beam
Retouch, produce and a series of become with x-axis 120 ° of scanning track as shown in Figure 4.
S5. according to entire scan path, it is scanned along along the direction becoming 60 ° with x-axis by computer controls laser beam, produce
Life is a series of to become 60 ° and the scanning track by front twice sweep track intersection point is as shown in Figure 5 with x-axis.Due to scanning pattern phase
Hand over, these intersection points experience three laser weldings；
S6. it is scanned as shown in fig. 6, as needed can edge by computer controls laser beam along the cross section profile of workpiece
The equal space line of the cross section contour of workpiece is scanned as shown in fig. 7, improving product intensity further.
The parallel sweep track mutual spacing of produced all directions is identical, i.e. l1=l2=l3.
Embodiment two:
A kind of triangulation network form Laser Scanning for selective laser sintering, mainly includes step:
S1. the bounding box according to product digital model cross section profile, obtains equilateral triangle regular permutations and combinations
Template is it is desirable to the boundary line of the template outside that is fully located at bounding box is as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain the template part within positioned at contour line,
I.e. entire scan path is as shown in Figure 2.
S3. according to entire scan path, low resolution laser scanning is carried out along x-axis by computer controls laser beam, produce
A series of scanning tracks parallel with x-axis are as shown in Figure 8.
S4. according to entire scan path, first carry out low point by computer controls laser beam along along the direction becoming 120 ° with x-axis
Resolution scans, and produces and a series of becomes with x-axis 120 ° of scanning track as shown in Figure 9.
S5. according to entire scan path, low resolution is carried out along along the direction becoming 60 ° with x-axis by computer controls laser beam
Rate scans, and produces and a series of becomes 60 ° with x-axis and the scanning track by front twice sweep track intersection point is as shown in Figure 10.Due to
Scanning pattern intersects, and these intersection points experience three laser weldings；
S6. according to entire scan path, scanning is finely divided along x-axis by computer controls laser beam, produces a series of and x
The parallel scanning track of axle is as shown in figure 11.
S7. according to entire scan path, first it is finely divided along along the direction becoming 120 ° with x-axis by computer controls laser beam
Scanning, is produced and a series of is become with x-axis 120 ° of scanning track as shown in figure 12.
S8. according to entire scan path, it is finely divided along along the direction becoming 60 ° with x-axis by computer controls laser beam and sweeps
Retouch, produce a series of become with x-axis 60 ° and as shown in figure 13 by front twice sweep track intersection point scanning track.Due to scanning
Path is intersected, and these intersection points experience three laser weldings；
S9. it is scanned as shown in figure 14 along the cross section profile of workpiece by computer controls laser beam.Permissible as needed
Equal space line along the cross section contour of workpiece is scanned as shown in figure 15, improves product intensity further.
In low resolution scanning and subdivision sweep phase, the parallel sweep orbit interval of produced all directions is identical.
Equilateral triangle in adjacent layer template can be arranged in same position in x-y plane it is also possible to interlaced arrangement, Figure 16
For the schematic diagram of three layers of template interlaced arrangement equilateral triangle, the position of equilateral triangle and ground floor phase in the 4th layer of template
With.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention, about the common skill of technical field
Art personnel, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all etc.
Same technical scheme falls within the protection category of the present invention.
Claims (7)
1. a kind of triangulation network form Laser Scanning for selective laser sintering it is characterised in that: according to cross section profile
Information, calculate the laser beam scan path in cross section profile, described laser beam scan path is three groups of parallel linear scanning roads
The triangulation network trellis entire scan path that footpath is constituted, every group of linear scanning path is made up of linear systematicness lines, laser
Bundle under control of the computer, is scanned according to the metal dust that laser beam scan path is located to the solid section of product, directly
Connect and produce workpiece.
2. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 1, it is special
Levy and be: the lines in every group are parallel to each other, three groups of lines are respectively along three different directions arrangements thus phase between three groups of lines
Hand over, after scanning, form the scanning track of triangulation network trellis, in triangle gridding, each triangle is equilateral triangle.
3. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 1, it is special
Levy and be: scanning process is laser beam under the control of the computer:
It is scanned along x/y axle by laser beam scan path by computer controls laser beam, produce a series of sweep parallel with x/y axle
Retouch track；
It is scanned along along the direction becoming 60 ° with x/y axle by laser beam scan path by computer controls laser beam, produce a series of
Become 60 ° of scanning track with x/y axle；
It is scanned along along the direction becoming 120 ° with x/y axle by laser beam scan path by computer controls laser beam, producing one is
Row become 120 ° of scanning track with x/y axle；
It is scanned along the cross section profile of workpiece by computer controls laser beam.
4. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, it is special
Levy and be: each scanning process order is in no particular order.
5. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, it is special
Levy and be: in each scanning direction, adjacent path spacing is identical.
6. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, it is special
Levy and be: the 3rd intersection point through the first two scanning direction track for the scanning direction track.
7. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, it is special
Levy and be: scanning track intersection point experiences three laser weldings.
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| CN109719397A (en) * | 2017-10-27 | 2019-05-07 | 波音公司 | Optimization covering selective laser ablation system and method |
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| CN104550950B (en) * | 2014-11-24 | 2015-09-16 | 湖南华曙高科技有限责任公司 | For the Laser Scanning of precinct laser fusion |
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| US11230061B2 (en) | 2015-10-28 | 2022-01-25 | Siemens Industry Software Inc. | System and method for optimizing tool paths based on thermal/structural simulations of a part being produced via a 3D-printer |
| CN106925776A (en) * | 2015-12-31 | 2017-07-07 | 周宏志 | A kind of subregion scanning pattern generation method of control increasing material manufacturing stress deformation |
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| US4863538A (en) * | 1986-10-17 | 1989-09-05 | Board Of Regents, The University Of Texas System | Method and apparatus for producing parts by selective sintering |
| US5855718A (en) * | 1996-10-07 | 1999-01-05 | 3D Systems, Inc. | Method of and apparatus for making partially solidified three-dimensional objects on a layer-by-layer basis from a solidifiable medium |
| CN103192080A (en) * | 2013-04-27 | 2013-07-10 | 余振新 | Selective laser sintering forming method |
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| CN109719397A (en) * | 2017-10-27 | 2019-05-07 | 波音公司 | Optimization covering selective laser ablation system and method |
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