CN103752823A - 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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- CN103752823A CN103752823A CN201310733109.1A CN201310733109A CN103752823A CN 103752823 A CN103752823 A CN 103752823A CN 201310733109 A CN201310733109 A CN 201310733109A CN 103752823 A CN103752823 A CN 103752823A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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 increase material and manufacture field, be specially a kind of triangulation network form Laser Scanning for selective laser sintering.
Background technology
Increase material manufacture (Additive Manufacturing), also claim Quick-forming or rapid shaping (Rapid Prototyping, be called for short RP), it is the new technology of a kind of quick finished parts or model, integrated Numeric Control Technology, machine design and manufacture, new material technology and Computer Applied Technology are the products of multidisciplinary synthesis.Increase material manufacture and be commonly called as 3D printing.
Selective laser sintering (Selective Laser Sintering, be called for short SLS) technique by tutor Joe doctor Beaman of Carl doctor Dechard and Ta in 19th century the mid-80 in the Austin of Texas ,Usa university branch school, succeed in developing, and carried out commercial development.SLS technology utilization dusty material is shaped: (1) is sprinkled upon the upper surface of formation of parts by material powder paving, and strikes off; (2) with high-intensity CO2 laser instrument, on the new layer just having spread, scan part section; (3) material powder is sintered together under high-intensity Ear Mucosa Treated by He Ne Laser Irradiation, obtains the cross section of part, and bonding with the part being shaped below; (4) after a layer cross section sintering is complete, spread new layer of material powder, selectively layer cross section under sintering, through the scanning sintering stack of some layers, finally completes the manufacture of whole prototype or workpiece.
In selective laser sintering manufacture process, its crudy Stimulated Light spot size, sweep speed, sweep span, scanning pattern, laser instrument send the factor impacts such as laser energy.In process, when dusty material melting and solidification, because cooling time sequencing difference can cause the non-homogeneous contraction of product, make the contraction of upper layer of material can make the subsurface material being attached thereto be subject to the effect of compression, and just in upper layer of material cooling and that shrink because there is the constraint of subsurface material, and be subject to the effect of tension, when this stress is serious, will cause the buckling deformation of molded layer, when serious, can crack, this is an international difficult problem during selective laser sintering is manufactured.The scan mode of laser beam is determining that the temperature field in processing aspect distributes, and has therefore determined the degree of buckling deformation.
In selective laser sintering manufacture process, the filling scan mode adopting at present mainly can be divided into parallel line sweeping, the scanning of profile equal space line and parallel lines and the hybrid scanning of profile equal space line.While adopting hybrid scanning, the scanning of profile equal space line is pressed on the border of interface profile; The inner parallel line sweeping of pressing.Parallel line sweeping only needs axle motion of rapidform machine, and sweep speed is fast.And scanning algorithm is simple, so program is also simpler, easily realize.The range of application of Selective Laser Sintering constantly expands, the evaluation criterions such as the precision to product are had higher requirement, further work out suitable laser beam flying path, the quality that manufactures workpiece for raising selective laser sintering is significant.
Summary of the invention
The object of this invention is to provide a kind of triangulation network form Laser Scanning for selective laser sintering, to realize in the buckling deformation that reduces product, when improving the precision of 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 characterized in that: according to the information of cross section profile, calculate the laser beam scan path in cross section profile, described laser beam scan path is three groups of triangulation network trellis entire scan paths that parallel linear scanning path forms, every group of linear scanning path consists of the systematicness lines of linearity, laser beam is under the control of computer, the metal dust at the solid section place according to laser beam scan path to product scans, and directly produces workpiece.
Described a kind of triangulation network form Laser Scanning for selective laser sintering, it is characterized in that: the lines in every group are parallel to each other, three groups of lines are arranged along three different directions respectively, between three groups of lines, intersect, the track while scan that forms triangulation network trellis after scanning, in triangle gridding, each triangle is equilateral triangle.
Described a kind of triangulation network form Laser Scanning for selective laser sintering, is characterized in that: laser beam scanning process under computer control is:
By computer controlled controlling laser beam, by laser beam scan path, along x/y axle, scanned, produce a series of track while scans parallel with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 60 ° with x/y axle, produce and a series ofly become the track while scan of 60 ° with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 120 ° with x/y axle, produce and a series ofly become the track while scan of 120 ° with x/y axle;
By computer controlled controlling laser beam, along the cross section profile of workpiece, scanned.
Described a kind of triangulation network form Laser Scanning for selective laser sintering, is characterized in that: all directions scanning process order in no particular order.
Described a kind of triangulation network form Laser Scanning for selective laser sintering, is characterized in that: in each scanning direction, adjacent path spacing is identical.
Described a kind of triangulation network form Laser Scanning for selective laser sintering, is characterized in that: the intersection point of the 3rd scanning direction track process the first two scanning direction track
Described a kind of triangulation network form Laser Scanning for selective laser sintering, is characterized in that: three laser weldings of track while scan intersection point experience.
The invention provides a kind of triangulation network form Laser Scanning for selective laser sintering, according to the information of cross section profile, laser beam is under the control of computer, the metal dust at the solid section place to product scans, scanning pattern intersects, and finally forms the overall path of triangulation network trellis.Scanning pattern intersection point place obtains laser welding three times, can improve the combination degree of adjacent layer for selective laser sintering.The present invention controls simply in technique, practical, can increase product intensity, reduces product deformation, improves whole product dimensional accuracy.
Accompanying drawing explanation
Fig. 1 is the triangulation network trellis scanning pattern generating principle schematic diagram for selective laser sintering.
Fig. 2 generates result schematic diagram for the triangulation network trellis scanning pattern of selective laser sintering.
Fig. 3 is that laser beam carries out scanning result schematic diagram along x direction of principal axis.
Fig. 4 is that laser beam is along the enterprising line scanning result schematic diagram of direction that becomes 120 ° with x axle.
Fig. 5 is that laser beam is along the enterprising line scanning result schematic diagram of direction that becomes 60 ° with x axle.
Fig. 6 is that laser beam is along cross section contour scanning result schematic diagram.
Fig. 7 is the equal space line scanning result schematic diagram of laser beam along cross section contour.
Fig. 8 is that laser beam carries out low-resolution scan result schematic diagram along x direction of principal axis.
Fig. 9 is laser beam along becoming with x axle in the direction of 120 ° to carry out low-resolution scan result schematic diagram.
Figure 10 is laser beam along becoming with x axle in the direction of 60 ° to carry out low-resolution scan result schematic diagram.
Figure 11 is that laser beam segments scanning result schematic diagram along x direction of principal axis.
Figure 12 is laser beam along becoming with x axle in the direction of 120 ° to segment scanning result schematic diagram.
Figure 13 is laser beam along becoming with x axle in the direction of 60 ° to segment scanning result schematic diagram.
Figure 14 is that laser beam is along cross section contour scanning result schematic diagram.
Figure 15 is the equal space line scanning result schematic diagram of laser beam along cross section contour.
Figure 16 is three layers of template interlaced arrangement schematic diagram during the triangle gridding shape scanning pattern of selective laser sintering generates.
The specific embodiment
A kind of triangulation network form Laser Scanning for selective laser sintering, according to the information of cross section profile, calculate the laser beam scan path in cross section profile, laser beam scan path is three groups of triangulation network trellis entire scan paths that parallel linear scanning path forms, every group of linear scanning path consists of the systematicness lines of linearity, laser beam is under the control of computer, and the metal dust at the solid section place according to laser beam scan path to product scans, and directly produces workpiece.
Laser beam scanning process under computer control is:
By computer controlled controlling laser beam, by laser beam scan path, along x/y axle, scanned, produce a series of track while scans parallel with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 60 ° with x/y axle, produce and a series ofly become the track while scan of 60 ° with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 120 ° with x/y axle, produce and a series ofly become the track while scan of 120 ° with x/y axle;
By computer controlled controlling laser beam, along the cross section profile of workpiece, scanned.
Each scanning process order in no particular order.
In each scanning direction, adjacent path spacing is identical.
The intersection point of the 3rd scanning direction track process the first two scanning direction track
Three laser weldings of track while scan intersection point experience.
The present invention mainly comprises step:
S1. according to the bounding box of the cross section profile of product digital model, obtain the template of a regularly arranged combination of equilateral triangle, the outside that the boundary line that seek template is positioned at bounding box completely as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain being positioned at the template part of outline line inside, entire scan path as shown in Figure 2.
S3. according to entire scan path, by computer controlled controlling laser beam, along x axle, scanned, produce a series of track while scans parallel with x axle as shown in Figure 3.
S4. according to entire scan path, first by computer controlled controlling laser beam along the enterprising line scanning of direction that becomes 120 ° with x axle, produce a series of become with x axle 120 ° track while scan as shown in Figure 4.
S5. according to entire scan path, by computer controlled controlling laser beam, along the enterprising line scanning of direction that becomes 60 ° with x axle, produce and a series ofly become 60 ° and the track while scan that passes through front twice sweep track intersection point as shown in Figure 5 with x axle.Because scanning pattern intersects, three laser weldings of these intersection point experience;
S6. by computer controlled controlling laser beam, along the cross section profile of workpiece, scanned as shown in Figure 6, can scan (Fig. 7) along the equal space line of the cross section contour of workpiece as required, further improve product intensity.
The parallel sweep orbit interval of all directions that produce is identical, i.e. L
1=L
2=L
3.
Embodiment mono-:
For a triangulation network form Laser Scanning for selective laser sintering, mainly comprise step:
S1. according to the bounding box of the cross section profile of product digital model, obtain the template of a regularly arranged combination of equilateral triangle, the outside that the boundary line that seek template is positioned at bounding box completely as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain being positioned at the template part of outline line inside, entire scan path as shown in Figure 2.
S3. according to entire scan path, by computer controlled controlling laser beam, along x axle, carry out laser scanning, produce a series of track while scans parallel with x axle as shown in Figure 3.
S4. according to entire scan path, first by computer controlled controlling laser beam along the enterprising line scanning of direction that becomes 120 ° with x axle, produce a series of become with x axle 120 ° track while scan as shown in Figure 4.
S5. according to entire scan path, by computer controlled controlling laser beam, along the enterprising line scanning of direction that becomes 60 ° with x axle, produce and a series ofly become 60 ° and the track while scan that passes through front twice sweep track intersection point as shown in Figure 5 with x axle.Because scanning pattern intersects, three laser weldings of these intersection point experience;
S6. by computer controlled controlling laser beam, along the cross section profile of workpiece, scanned as shown in Figure 6, can scan as shown in Figure 7 along the equal space line of the cross section contour of workpiece as required, further improve product intensity.
The parallel sweep track mutual spacing of all directions that produce is identical, i.e. L
1=L
2=L
3.
Embodiment bis-:
For a triangulation network form Laser Scanning for selective laser sintering, mainly comprise step:
S1. according to the bounding box of product digital model cross section profile, obtain the template of a regularly arranged combination of equilateral triangle, the outside that the boundary line that seek template is positioned at bounding box completely as shown in Figure 1.
S2. utilize the cross section profile cutting template of product digital model, obtain being positioned at the template part of outline line inside, entire scan path as shown in Figure 2.
S3. according to entire scan path, by computer controlled controlling laser beam, along x axle, carry out low resolution laser scanning, produce a series of track while scans parallel with x axle as shown in Figure 8.
S4. according to entire scan path, first by computer controlled controlling laser beam along becoming with x axle in the direction of 120 ° to carry out low-resolution scan, produce a series of become with x axle 120 ° track while scan as shown in Figure 9.
S5. according to entire scan path, by computer controlled controlling laser beam, along becoming with x axle in the direction of 60 ° to carry out low-resolution scan, produce and a series ofly become 60 ° and the track while scan that passes through front twice sweep track intersection point as shown in figure 10 with x axle.Because scanning pattern intersects, three laser weldings of these intersection point experience;
S3. according to entire scan path, by computer controlled controlling laser beam, along x axle, segment scanning, produce a series of track while scans parallel with x axle as shown in figure 11.
S4. according to entire scan path, first by computer controlled controlling laser beam along becoming with x axle in the direction of 120 ° to segment scanning, produce a series of become with x axle 120 ° track while scan as shown in figure 12.
S5. according to entire scan path, by computer controlled controlling laser beam along becoming with x axle in the direction of 60 ° segment scanning, produce a series of become with x axle 60 ° and pass through front twice sweep track intersection point track while scan as shown in figure 13.Because scanning pattern intersects, three laser weldings of these intersection point experience;
S6. by computer controlled controlling laser beam, along the cross section profile of workpiece, scanned as shown in figure 14.Can scan as shown in figure 15 along the equal space line of the cross section contour of workpiece as required, further improve product intensity.
At low-resolution scan and segmentation sweep phase, the parallel sweep orbit interval of all directions that produce is identical.
Equilateral triangle in adjacent layer template can be in x-y horizontal layout in same position, also can interlaced arrangement, Figure 16 is the schematic diagram of three layers of template interlaced arrangement equilateral triangle, and with different colours sign, in the 4th layer of template, the position of equilateral triangle is identical with ground floor respectively.
Above embodiment is only for illustrating the present invention; but not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification, therefore all technical schemes that are equal to also belong to protection category of the present invention.
Claims (7)
1. the triangulation network form Laser Scanning for selective laser sintering, it is characterized in that: according to the information of cross section profile, calculate the laser beam scan path in cross section profile, described laser beam scan path is three groups of triangulation network trellis entire scan paths that parallel linear scanning path forms, every group of linear scanning path consists of the systematicness lines of linearity, laser beam is under the control of computer, the metal dust at the solid section place according to laser beam scan path to product scans, and directly produces workpiece.
2. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 1, it is characterized in that: the lines in every group are parallel to each other, thereby three groups of lines are arranged between three groups of lines and are intersected along three different directions respectively, the track while scan that forms triangulation network trellis after scanning, 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, is characterized in that: laser beam scanning process under computer control is:
By computer controlled controlling laser beam, by laser beam scan path, along x/y axle, scanned, produce a series of track while scans parallel with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 60 ° with x/y axle, produce and a series ofly become the track while scan of 60 ° with x/y axle;
By computer controlled controlling laser beam by laser beam scan path along become the enterprising line scanning of direction of 120 ° with x/y axle, produce and a series ofly become the track while scan of 120 ° with x/y axle;
By computer controlled controlling laser beam, along the cross section profile of workpiece, scanned.
4. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, is characterized in that: each scanning process order in no particular order.
5. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, is characterized in that: 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, is characterized in that: the intersection point of the 3rd scanning direction track process the first two scanning direction track.
7. a kind of triangulation network form Laser Scanning for selective laser sintering according to claim 3, is characterized in that: three laser weldings of track while scan intersection point experience.
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| CN106077638A (en) * | 2016-05-31 | 2016-11-09 | 合肥工业大学 | A kind of for increasing the honeycomb fashion subarea-scanning method that material manufactures |
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| WO2017068300A1 (en) * | 2015-10-23 | 2017-04-27 | Applications Additives Avancees 3A | Method of production using melting and hot isostatic pressing |
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