CN104175556B - Rapid forming method based on double-forming head - Google Patents
Rapid forming method based on double-forming head Download PDFInfo
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- 239000010410 layers Substances 0.000 claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000000034 methods Methods 0.000 claims abstract description 15
- 238000007639 printing Methods 0.000 claims abstract description 10
- 239000007787 solids Substances 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims description 26
- 238000007493 shaping process Methods 0.000 claims description 18
- 239000000155 melts Substances 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 5
- 210000003128 Head Anatomy 0.000 description 59
- 239000000203 mixtures Substances 0.000 description 3
- 238000010408 sweeping Methods 0.000 description 3
- 210000004761 Scalp Anatomy 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 2
- 238000010586 diagrams Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering processes Methods 0.000 description 2
- 239000011347 resins Substances 0.000 description 2
- 229920005989 resins Polymers 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical methods Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effects Effects 0.000 description 1
- 230000002079 cooperative Effects 0.000 description 1
- 238000000354 decomposition reactions Methods 0.000 description 1
- 239000000686 essences Substances 0.000 description 1
- 239000007788 liquids Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000006116 polymerization reactions Methods 0.000 description 1
- 230000036633 rest Effects 0.000 description 1
- 241000894007 species Species 0.000 description 1
Abstract
Description
Technical field
The present invention relates to rapid shaping technique, specially a kind of quick molding method based on double forming heads.
Background technology
The ultimate principle of rapid shaping is according to layering accumulation method, collects the three dimensional structure information of related object, will Data modeling, and carry out stratiform decomposition, form respective data file by layer, i.e. a series of two dimension plane data；Then root Inversely set up machining path according to differing formed technique；Finally, by computer aided manufacturing program (cad) according to predetermined processing Program is successively manufactured into three-dimensional objects entity.
The precision of rapid shaping drip molding refers to the error between drip molding and former threedimensional model after processing, mainly has chi Very little error, form error and surface error.What existing rapidform machine was commonly used is elaborate servo motion, completely can be by Its movement position precision controlling is in micron-sized level.But, the precision of drip molding be more than relevant with rapidform machine, also with Other factors are relevant.Among these, " step effect " impact to its precision of drip molding is than larger." step effect " refers to During actual manufacture, the theoretical contour of drip molding and actual active line have a certain distance." 3dp is fast at it for Liang Yan Rapid-result type precision analysis " in, analyze the Railway Project of impact three-dimensional printer precision, and to this allusion quotation of wherein alias Type problem is analyzed, and the effective way that it proposes is to reduce thickness, improves precision.But it does not refer to because reducing layer The thick and solution of the problem of bringing efficiency to reduce.
Meanwhile, the Liu Daoyuan of the Huaqiao University and Cheng Yanjie of the Central China University of Science and Technology in its Master's thesis all to rapid shaping Middle path planning is made that research to raising formed precision and efficiency, and they have studied the method in compound scan path for fast The change that fast formed precision and efficiency are brought, but all do not refer to the impact to formed precision and efficiency of forming head.
Due in path scanning problem, although simple contour line offset algorithm improves its precision and efficiency, When profile is more complicated, interference or " isolated island " phenomenon easily occurs at the end of recurrence is fast, and workpiece is interior Skew line filling in portion region is to carrying high-precision having little significance.
Content of the invention
For the deficiencies in the prior art, the technical problem that the present invention intends to solve is that design is a kind of fast based on double forming heads Fast forming method.The method adopts double precision forming head, and high accuracy forming head is responsible for the printing manufacture in outer workpiece region, conventional The forming head of precision is responsible for the printing manufacture in inside workpiece region, solves the surface quality of workpiece and overall processing efficiency is difficult to The problem taken into account.The present invention during the scanning pattern of planning high accuracy and the forming head of conventional precision, to interior zone and Perimeter carries out different scan methods respectively, different sweep span, then the forming head subregion coordinating two kinds of different accuracies Manufacture, both met required precision, and also account for shaping efficiency.
The present invention solves described technical problem and is adopted the technical scheme that: designs a kind of fast short-term training based on double forming heads Type method, the method comprises the following steps:
(1) three-dimensional entity model is gone out by three-dimensional solid modeling software building, then by three-dimensional entity model with model data The form output of file；Described model data file is stl, slc, cli, rpi, leaf, sif, cfl, iges, step or dxf One of file format；
(2) pass through software program, this model data file of discriminatory analysiss, first carry out along three-dimensional entity model forming direction Two-dimentional layered shaping, then carries out zones of different division to every layer, is divided into perimeter and interior zone, then to perimeter It is layered, obtain discrete two-dimentional synusia information again；Or first to three-dimensional entity model from surface to three-dimensional entity model inside Carry out inside and outside region division, be divided into perimeter and interior zone, then internal again, exterior domain layering, obtain discrete two dimension Synusia information；
(3) pass through path planning program, the two-dimentional synusia information discrete to gained is scanned the planning in path, according to it The profile information of scanning, cooks up the forming head scanning pattern of two kinds of precision: i.e. high accuracy path and conventional precision path respectively, Then the file comprising hierarchical path planning information that output computer can identify；
(4) profile information according to every layer of scanning, is manufactured by computer controls forming head, and conventional precision shapes scalp acupuncture To inside, fast speed is filled；High accuracy forming head is directed to contour surface, and high accuracy is filled, and the two completes filling out of this layer jointly Fill manufacture work；
After (5) one layers have printed, workbench is motionless, prepares the printing manufacture of next layer；
(6) repeat (4), the work process of (5) step, until completing all of print job, take out workpiece；
(7) workpiece of taking-up is carried out post processing.
Compared with prior art, the present invention adopts double precision forming head, and high accuracy forming head is responsible for outer workpiece region Print and manufacture, conventional precision forming head is responsible for the printing manufacture in inside workpiece region, high accuracy forming head is shaped with conventional precision The precision of head becomes n (integer) times of relation hence it is evident that improve surface quality and the overall processing efficiency of workpiece；In planning high accuracy During the scanning pattern of the forming head of conventional precision, to internal and external contour line subregion nearby, and using different scanning sides Method, then coordinate the forming head subregion of two kinds of different accuracies to manufacture it is achieved that processing high accuracy and the high efficiency of forming of workpiece.
Brief description
Fig. 1 is the software flow schematic diagram of the quick molding method based on double forming heads for the present invention；Wherein, Fig. 1 (a) is first The software flow pattern of the quick molding method based on double forming heads of multidomain treat-ment after layering, Fig. 1 (b) is that first subregion is layered place again The software flow pattern of the quick molding method based on double forming heads of reason；
Fig. 2 is a kind of scanning pattern subregion schematic diagram of embodiment of the quick molding method based on double forming heads for the present invention；
Fig. 3 is that a kind of planning parameters of scanning paths flow process of embodiment of the quick molding method based on double forming heads for the present invention is illustrated Figure；
In in figure, 1. perimeter, 2. interior zone, 3. contour line.
Specific embodiment
It is further described the present invention with reference to embodiment and accompanying drawing.Following embodiments are only detailed further to the present invention Carefully illustrate and explain, the application scope of the claims is not limited with this.
The present invention design the quick molding method (abbreviation method, referring to Fig. 1-3) based on double forming heads specifically include with Lower step:
(1) three-dimensional entity model is gone out by three-dimensional solid modeling software building, then by three-dimensional entity model with model data The form output of file；Described model data file is stl, slc, cli, rpi, leaf, sif, cfl, iges, step or dxf One of file format；
(2) pass through software program, this model data file of discriminatory analysiss, first carry out along three-dimensional entity model forming direction Two-dimentional layered shaping, then carries out zones of different division to every layer, is divided into perimeter and interior zone, then to perimeter It is layered, obtain discrete two-dimentional synusia information again；Or first to three-dimensional entity model from surface to three-dimensional entity model inside Carry out inside and outside region division, be divided into perimeter and interior zone, then internal again, exterior domain layering, obtain discrete two dimension Synusia information；
(3) pass through path planning program, the two-dimentional synusia information discrete to gained is scanned the planning in path, according to it The profile information of scanning, cooks up the forming head scanning pattern of two kinds of precision: i.e. high accuracy path and conventional precision path respectively, Then the file comprising hierarchical path planning information that output computer can identify；
(4) profile information according to every layer of scanning, is manufactured by computer controls forming head, and conventional precision shapes scalp acupuncture To inside, fast speed is filled；High accuracy forming head is directed to contour surface, and high accuracy is filled, and the two completes filling out of this layer jointly Fill manufacture work；
After (5) one layers have printed, workbench is motionless, prepares the printing manufacture of next layer；
(6) repeat (4), the work process of (5) step, until completing all of print job, take out workpiece；
(7) workpiece of taking-up is carried out post processing.
The inventive method is further characterized by described high accuracy forming head and becomes whole with the precision of conventional precision forming head The relation of several times.
The inventive method is further characterized by described forming head and includes laser head, shower nozzle, is squeezed into forming head or melting Extruder head.
The inventive method be further characterized in that further described model data file be stl file, cli file or slc literary composition Part.
The actuator being further characterized in that the method further of the inventive method includes parallel institution and serial mechanism.
Model data file in the present invention refers to conventional rapid shaping model data file, more common have stl, The file of slc and cli form, the file such as rpi, leaf, sif, cfl, iges, step, dxf can also be suitable for.Institute in the present invention State post processing and include the steps such as cleaning, solidify afterwards and any surface finish process, can further improve intensity and the precision of model.This Forming head described in invention is laser head, shower nozzle, is squeezed into forming head or melt extrudes first-class, and is not limited only to described shaping Head, its species is applied to all forming heads that rapid shaping field is applied.
The inventive method be first layered after multidomain treat-ment the quick molding method based on double forming heads software flow (referring to Fig. 1 (a)) be:
A. three entity dimension module are gone out by three-dimensional solid modeling software building, by three-dimensional entity model with model data file Form exports；
B. reading model data file, then carries out layered shaping to three-dimensional entity model；
C. and then again multidomain treat-ment is carried out to each layer, mark off zones of different, be i.e. perimeter and interior zone；Wheel Profile is perimeter to the internal certain distance of entity, and remainder is interior zone, but due to conventional precision and high accuracy The thickness of forming head work is inconsistent, so being also performed to layered shaping in perimeter, according to high accuracy forming head and routine Integral multiple relation between precision forming head, calculates the layering number of plies, can be obtained according to b SPL method here, finally right Interior zone and perimeter surface carry out path planning, interior zone no required precision, can adopt simple scan method, Perimeter is high to required precision, employing can put forward high-precision scan method, such as pair-wise offset method.Finally to whole three Dimension physical model is successively manufactured, and completes workpiece.
The inventive method elder generation subregion again the quick molding method based on double forming heads of layered shaping software flow (referring to Fig. 1 (b)) be:
A. three-dimensional entity model is gone out by three-dimensional solid modeling software building, by three-dimensional entity model with model data file Form exports；
B. reading model data file, then according to model data file to three-dimensional entity model from surface to 3D solid Carry out inside and outside region division inside model, be defined to the internal certain distance of three-dimensional entity model by surface, be divided into perimeter and Interior zone, but because the thickness of conventional precision and the work of high accuracy forming head is inconsistent, so carrying out again in interior exterior domain Layered shaping, according to the integral multiple relation between high accuracy forming head and conventional precision forming head, calculates the layering number of plies, here Can be obtained according to csg method, then obtain contour line information, respectively perimeter and interior zone are scanned with path rule Draw, meanwhile, using putting forward high-precision scan method, such as pair-wise offset method, interior zone can be using simple for perimeter Scan method improves efficiency, and high accuracy forming head manufactures perimeter, and conventional precision forming head manufactures interior zone, finally to whole Individual three-dimensional entity model is successively manufactured, and completes workpiece.
The inventive method be first layered after multidomain treat-ment the quick molding method based on double forming heads scanning pattern subregion The concrete grammar of (referring to Fig. 2) is: obtains contour line information, contour identification line 3 first, then carries out near contour line point Area, that is, be divided into contour line near zone and interior zone 2, wherein contour line near zone i.e. perimeter 1 to be high accuracy Scanning area, interior zone 2 is conventional precision scanning area.
The inventive method be first layered after multidomain treat-ment the quick molding method based on double forming heads planning parameters of scanning paths (referring to Fig. 3) is using pair-wise offset scanning and parallel line sweeping method, in conjunction with double forming heads work simultaneously application partition scanning skill Art, realizes the planning of scanning pattern.Obtain the contour line information of two-dimentional aspect first, then carry out the finishing of contour line, will be interior Carry out subregion near outer contour, that is, be divided into contour line near zone (perimeter 1) and interior zone 2, near contour line Region obtains the contour offset number of times of contour line near zone, using pair-wise offset scan method, is swept using high accuracy forming head Key drawing offset area；Interior zone adopts parallel line sweeping method, and the forming head using conventional precision scans interior parallel Line region；Then it is scanned from inside to outside, stress can be made effectively to be discharged, after one layer of scanning, carry out next layer of scanning again, It is finally completed whole scanning process.
The scanning pattern rule of the first subregion quick molding method based on double forming heads of layered shaping again in the inventive method Draw and scanning pattern partition method with first be layered after multidomain treat-ment the quick molding method based on double forming heads scanning pattern Planning and scanning pattern partition method are similar to.
The inventive method sends instruction by industrial computer on hardware, controls the running of card control servomotor, manufactures successively During, manufacture from inside to outside, because high-precision thickness is less than the thickness of conventional precision, this two are shaped in good time Head switching, has manufactured interior zone, when z-axis moves to perimeter, will decline (n-1) individual high accuracy thickness height, start to make Make outside high accuracy region, by sensor can immediate feedback working condition and its influence factor, be convenient to industrial computer in time Adjust instruction.The actuator of the inventive method includes parallel institution and serial mechanism.
Embodiment 1
The present embodiment is application in sla field for the inventive method, can use low-light, ultraviolet using the inventive method The generating laser cooperative cooperating of two kinds of different frequencies of light, inside ultraviolet light polymerization physical member, improves work efficiency, low-light solidifies Surface, improves precision, had both met the current demand to precision, and had also improved work efficiency, and can also reduce plant equipment Cost.
As a example the present embodiment quick molding method based on double forming heads of multidomain treat-ment after to be first layered, its concrete steps As follows:
(1) first three-dimensional entity model is gone out by three-dimensional solid modeling software building, then by three-dimensional entity model with stl literary composition Part form exports, and stl file is a kind of file format representing three-dimensional entity model with triangle surface, and it is with surrounding three The grid representation solid threedimensional information of dimension volume.
(2) pass through software program, discriminatory analysiss stl file, carry out two dimension layering along three-dimensional entity model forming direction Process, whole three-dimensional entity model is separated into a series of continuous two dimension synusia information, sets each layer of thickness, precision Require higher, thickness is less.This layer is carried out with subregion, contouring line inward deflection (0.01-20.00) mm is perimeter, Remainder is interior zone (referring to Fig. 2).
(3) pass through path planning program, these discrete two-dimentional synusia information are scanned with the planning in path, according to it The profile information of scanning, cooks up the laser head scanning pattern (referring to Fig. 3) of two kinds of precision respectively, that is, in a scanning entity Portion, another one scans solid object surface, then to export the literary composition comprising hierarchical path planning information that computer can identify Part.
(4) computer controls workbench rests in a rational height, then controls laser head according to every layer of two dimension Synusia information, is manufactured, this two laser head collaborative works；Ultraviolet laser emitter works, and ultraviolet laser head is filled Inside drip molding, speed is fast；Low-light generating laser works, and is directed to the filling of outermost surface by lens, reflecting mirror and manufactures, essence Degree is high.The two completes the filling manufacture work of this layer jointly.
After (5) one layers have printed, workbench is motionless, and scraper plate moves along x-axis, on originally cured resin surface all Coat the new liquid resin of last layer, workbench declines, and prepares the printing manufacture of next layer evenly.
(6) repeat the work process of (4) (5), until completing all of print job, rise workbench, take out workpiece.
(7) workpiece is carried out, solidify afterwards and any surface finish are processed.
The present embodiment is to make a radius for 10mm, the highly cylinder for 10mm, and the scanning speed of setting is 3500mm/ S, thickness is 0.10mm, and perimeter sweep span is 0.2mm, and interior zone sweep span is 0.3mm, according to above step Relatively traditional handicraft and application present invention process make model time and precision.
Traditional handicraft: make one layer, using pair-wise offset scanning pattern, path is about 1601.4mm, time-consuming 0.458s, always Time-consuming 45.8s, surface accuracy is ± 0.1mm.
And utilize the inventive method, and make one layer, contour line near zone pair-wise offset 2 times, remaining interior zone adopts Parallel line sweeping method, perimeter printing two-layer is concordant with interior zone thickness, and path computing about obtains 682.8mm, takes 0.195s, total time-consuming 19.5s, surface accuracy is submicron order.
It can thus be seen that the inventive method significantly improves precision and the shaping efficiency of its processing workpiece.
In the inventive method, either using multidomain treat-ment after being first layered, still using first subregion, layered shaping all can show again Write the surface quality improving workpiece and overall processing efficiency.
The precision of suitable double forming heads, the precision of high accuracy forming head and conventional precision forming head are set in the present embodiment The relation becoming integral multiple is hence it is evident that improve surface quality and the overall processing efficiency of workpiece.The inventive method is applied equally to The technique manufacturing process of fdm, lom, 3dp, and the processing high accuracy of workpiece and the requirement of high shaping efficiency can be met.
Do not address part in the present invention and be all suitable for prior art.
Claims (5)
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| CN110253890B (en) * | 2019-07-25 | 2020-09-15 | 电子科技大学 | Additive manufacturing composite layered slicing method |
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| US7625512B2 (en) * | 2003-07-15 | 2009-12-01 | Hewlett-Packard Development Company, L.P. | Method and a system for producing an object using solid freeform fabrication |
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Application publication date: 20141203 Assignee: Chaoyisan Technology Co., Ltd Assignor: Hebei University of Technology Contract record no.: X2020980001045 Denomination of invention: Rapid forming method based on double-forming head Granted publication date: 20170201 License type: Common License Record date: 20200327 |