CN109175366A - A kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency - Google Patents
A kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency Download PDFInfo
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- CN109175366A CN109175366A CN201811188406.1A CN201811188406A CN109175366A CN 109175366 A CN109175366 A CN 109175366A CN 201811188406 A CN201811188406 A CN 201811188406A CN 109175366 A CN109175366 A CN 109175366A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/10—Auxiliary heating means
- B22F12/13—Auxiliary heating means to preheat the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
- B22F10/322—Process control of the atmosphere, e.g. composition or pressure in a building chamber of the gas flow, e.g. rate or direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/20—Cooling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/40—Radiation means
- B22F12/49—Scanners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/70—Gas flow means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/90—Means for process control, e.g. cameras or sensors
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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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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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 belongs to 3D printing corollary equipment technical fields, and disclose it is a kind of for high-temperature laser constituency sintering optics heating power protection and cooling system, its integral arrangement is divided into the first protective layer, the second protective layer and third protective layer for stacking gradually into sandwich construction along short transverse in the shaped cavity top of selective laser sintering equipment from the bottom to top.Also further design is optimized in the specific structure to this three-layer protection layer and working mechanism to the present invention.Through the invention, it can not only realize to the effective heat-insulated of shaped cavity, it realizes and effective heating power protection and cooling is formed to entire optical system, it is in laser and other optical components in operating temperature range, even and if also ensuring that forming process carries out with security and stability in the case where 400 DEG C of high-temperature laser constituency is sintered operating condition.
Description
Technical field
The invention belongs to 3D printing corollary equipment technical fields, burn more particularly, to one kind for high-temperature laser constituency
The optics heating power of knot protects and cooling system.
Background technique
So-called selective laser sintering (Selective Laser Sintering, SLS), is increases material manufacturing technology
The important branch of (Additive Manufacturing, AM), use Layered manufacturing and be superimposed principle, can directly from
CAD model produces 3D solid components, is the forward position of advanced manufacturing field research.The maximum advantage of SLS technology is can be at
The arbitrarily complicated constitutional detail of shape, and can realize heavy parts exempt from assemble a monolithic molding, therefore in aerospace, biology
Medical, auto industry field labyrinth components manufacture view is used widely.
However, controlling exigent material for certain pairs of temperature parameters forms application, SLS is faced with more
Technical problem to be solved.For example, the spies such as high-performance polyarylether ketone (PAEKs), Nomex (Aromafic Polyamides)
Kind polymer material successfully substitutes aluminium alloy in auto parts and components manufacture with its higher specific strength and fracture toughness.It is this kind of
Special copolymer material fusing point (such as polyether-ether-ketone PEEK material, fusing point are about 340 DEG C) generally with higher, to prevent
Part buckling deformation in forming process, it is desirable that preheating temperature is arranged at 330-337 DEG C (laser sintered window) in SLS forming process
In range；And for the PEEK powder of aging, its fusing point is higher, and sintering window is narrower, and preheating temperature is positioned proximate to 400 DEG C.Separately
Outside, forming cavity body temperature must also be kept uniform, to reduce the temperature gradient of laser sintered melt and surrounding powder, be guaranteed molten
Body Homogeneouslly-radiating reduces element precision deviation.
In the case, so high preheating temperature proposes very high requirement to SLS increasing material manufacturing equipment.Due at
At 400 DEG C or so, the easily aging of chamber in-body devices is impaired even to fail shape cavity inner temperature, and equips and there is heat transfer, sealing
Etc. various problems, the numerous devices entirely equipped be required to the protection of preferable heating power.On the other hand, SLS equipment is most important works as
Belong to optical system, it is expensive, accounts for 70% or more of entire equipment price.And current optical system is mounted on shaped cavity
Top, with shaped cavity apart from very close, therefore the heating power protection for how carrying out entire optical system equally constitutes one urgently
Technical problem to be solved.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides one kind is sintered for high-temperature laser constituency
The protection of optics heating power and cooling system, wherein structure and technology characteristics point by combining existing selective laser sintering equipment
Analysis, specific aim are additionally arranged the protection of stacked namely sandwich construction the heating power comprising multiple functional modules and cooling system, and
And optimization design further is made that many aspects such as its specific configuration composition and working mechanisms, it accordingly can not only be well
Integrated use various ways are to carry out the entire optical module above shaped cavity heating power protection and effectively cooling, and i.e.
Just the high-precision of selective laser fusion process is also ensured that under the operating condition of harsh temperatures control condition and is stablized carries out, thus it is outstanding
It is suitable for the applications of for example special copolymer material SLS molding etc.
Correspondingly, it is proposed, according to the invention, provide a kind of protection of optics heating power and cooling for the sintering of high-temperature laser constituency
System, which is characterized in that optics heating power protection and cooling system integral arrangement are in the shaped cavity of selective laser sintering equipment
Top, and it is divided into the first protective layer, the second protective layer and the third protection stacked gradually from the bottom to top along short transverse
Layer, in which:
First protective layer is presented the form of air-cooled structure layer and is laid on the shaped cavity top, and including being located at a left side
The cold air import of right two sides and cold air outlet, upper window and lower window positioned at upper and lower two sides, and sealed in central region
Closure encloses the cavity to be formed；It is separated into after wherein cold air enters via the cold air import by the multilayer spoiler of air inlet grid
Multilayer laminar flow cold air, then pass to the cavity with execute Multi-layer exchanging heat with it is heat-insulated；Laminar gas after heat exchange continues through row
Gas grid is discharged by the cold air outlet；In addition, the upper window and lower window collectively form a laser perspective path,
And for laser beam through the forming table top reached positioned at the shaped cavity lower part；
Second protective layer is presented the form of water-cooling structure layer and continues the top for being laid on first protective layer, and wraps
Include water-cooling base plate and water cooling temperature sensor；Wherein the water-cooling base plate has a built-in follow-cooling passageway, and it is from cold water
The folding of import curve extends to cooling water outlet, thus plays cooling function by means of flowing through the cooling medium in it；The water
Cold temperature sensor is then used to be monitored the top environment temperature of the water-cooling base plate, and provides monitoring feedback data with reality
When adjust circulating cooling medium inflow temperature value；
The third protective layer is presented the form of air-cooled structure layer and continues the top for being laid on second protective layer, and wraps
Include the double air ducts being arranged from inside to outside namely interior air duct and outer air duct；Wherein the interior air duct will be mounted on swashing on horizontal panel
All components of light optical module are placed in wherein, and execute air-cooled cooling by means of the cold air that air inlet enters；
The outer air duct is then used to for being placed in one in the interior air duct, and thus other heat sources are thermally shielded with outside.
As it is further preferred that its cavity lower part is preferably additionally provided with for first protective layer
One graphite plate, and execute heat transfer along plate in-plane using it and hardly conduct heat in the direction perpendicular to plate plane
Heat transfer anisotropy further increase heating power protection effect.
As it is further preferred that its water-cooling base plate lower part is preferably also set for second protective layer
It is equipped with a carbon fiber supporting pad, thus while playing support and sealing function, also acts as further heat-insulated effect.
As it is further preferred that the material of the water-cooling base plate is preferably high thermal conductivity steel, and material is preferably increased by metal
Manufacturing method is made.
As it is further preferred that for the third protective layer, it is also preferable to include wind chill temperatures sensors for it, should
Wind chill temperatures sensor close to the laser optics module laser and place, and for executing reality to the temperature of this laser
When monitor.
As it is further preferred that the outer air duct, interior air duct preferably share a cold air with first protective layer
Source.
As it is further preferred that the protection of above-mentioned optics heating power and cooling system preferably apply to F-theta lens focus
The 2-D vibration mirror laser scanning system of mode or the three-dimensional galvanometer laser scanning system of dynamic focusing mode.
As it is further preferred that the protection of above-mentioned optics heating power and cooling system preferably may be fitted with insulation compoboard
It works altogether；The insulation compoboard is arranged between lens vibrating type laser scanning system, powder feeding cavity and shaped cavity, and for pair
It is realized between three mutual effectively heat-insulated；The insulation compoboard is by first group for being thermally shielded to Y-Z axial plane direction
Plywood and the second compoboard for being thermally shielded to X-Y axial plane direction are composed, and wherein Y direction is defined as level
Longitudinal direction, Z axis are defined as vertical direction；In addition, the first, second compoboard along thickness direction include multilayer each other
The graphite plate and insulation material layer at interval are to form more sandwiches, and when compoboard is arranged along X-Y axial plane, this
A little graphite plates and the powder feeding chamber table top keeping parallelism, and when compoboard is arranged along Y-Z axial plane, these graphite plates with
The powder feeding chamber table top keeps vertical.
In general, the above technical scheme conceived by the present invention compared with prior art, mainly has technology below
Advantage:
1, the structure and technology characteristics of the invention by existing selective laser sintering equipment is analysed in depth, specific aim
The a whole set of protection of optics heating power and cooling system are constructed, it accordingly can not only be to the entire light for being located at laser selection agglomerating plant
It learns module and forms effective cooling and heating power protection effect, and is sintered even for for example 400 DEG C of high-temperature laser constituency
Journey can equally ensure to carry out with security and stability；
2, also design further is optimized to composition construction, space layout and the working mechanism of the system in the present invention,
More actual test the result shows that, the comprehensive fortune of this sandwich or stacked arrangement and several working ways
With, can adapt in various types of galvanometer laser scanning systems, chores table top can match, and laser choose burn
The effective heat-insulated of hot forming cavity is realized during knot, so that laser and other optical layouts are in suitable work temperature
It spends in range, is provided simultaneously with the features such as compact-sized, convenient for manipulation；
3, system according to the invention is also provided with temperature sensor in the second protective layer and third protective layer, supervises in real time
Laser works situation is surveyed, when laser is more than critical operating temperatures, entire selective laser sintering equipment alarms and stops work
Make, plays a good protective effect to laser.
Detailed description of the invention
Fig. 1 is according to the protection of optics heating power and cooling system for being used for the sintering of high-temperature laser constituency constructed by the present invention
Overall structure diagram；
Fig. 2 is to protect according to the protection of optics heating power designed by a preferred embodiment of the invention with cooling system first
The structural schematic diagram of layer；
Fig. 3 is to protect according to optics heating power protection designed by another preferred embodiment of the present invention with cooling system second
Layer and its attachment structure schematic diagram with the first protective layer；
Fig. 4 is to protect according to optics heating power protection designed by another preferred embodiment of the present invention with cooling system third
The structural schematic diagram of layer；
Fig. 5 is obtained along Y-Z section according to third protective layer designed by the another preferred embodiment of the present invention
Schematic cross-section；
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
The first protective layer of 1-, the second protective layer of 2-, 3- third protective layer, 4- forming cavity, 41- shape table top, 11- cold air
Import, window under 12- air inlet grid, the upper window of 13-, 14-, 15- cavity, 16- cold air outlet, 17- exhaust grille, 18-
Graphite plate, 19- metal frame, 21- water-cooling base plate, follow-cooling passageway built in 211-, 212- cooling water inlet, 213- cooling water outlet,
22- water cooling temperature sensor, 23- carbon fiber supporting pad, 24- metal frame, 31- fiberglass packing, 32- horizontal panel, 33- wind
Cold temperature sensor, 34- laser optics module, 341- laser, 342- beam expanding lens, 343- quartz ampoule, 344- plane mirror,
345- dynamic focusing system, 346- objective lens, 347- scanning galvanometer, 41- shape table top, the bis- air ducts 35-, air duct in 351-,
352- outer air duct, 5- are insulated compoboard, 6- powder feeding chamber, 7- laser scanning system
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Fig. 1 is according to the protection of optics heating power and cooling system for being used for the sintering of high-temperature laser constituency constructed by the present invention
Overall structure diagram.As shown in Figure 1, the system integral arrangement is in the shaped cavity top of selective laser sintering equipment, and
It is divided into and stacks gradually or the first protective layer 1 of sandwich structure, the second protective layer 2 and from the bottom to top along short transverse
Three protective layers 3, and heating power protection and cooling function are effectively played with the common cooperation of these protective layers and working mechanism.Under
These principal functional components will be explained one by one in face, for ease of understanding for the sake of, horizontal transverse direction is defined as X-axis
Direction, horizontal longitudinal direction is defined as Y direction, and short transverse is defined as Z-direction.
For the first protective layer 1, it is presented the form of air-cooled structure layer and is laid on 4 top of shaped cavity,
And including be located at the left and right sides cold air import 11 and cold air outlet 16, positioned at the upper window 13 and lower window of upper and lower two sides
14, and the cavity 15 for surrounding and being formed is closed in central region；By air inlet after wherein cold air enters via the cold air import 11
The multilayer spoiler of grid 12 is separated into multilayer laminar flow cold air, then pass to the cavity 15 with execute Multi-layer exchanging heat with every
Heat；Laminar gas after heat exchange continues through exhaust grille 17 and is discharged by the cold air outlet 16；In addition, the upper window and
Lower window collectively forms a laser perspective path, and is located at the shaped cavity lower part through arrival for laser beam
Shape table top 41.
More specifically, as shown in Figures 2 and 3, the first protective layer 1 is air-cooled structure layer, and it includes cold air imports 11, air inlet
Grid 12, upper window 13, lower window 14, cavity 15, cold air outlet 16, exhaust grille 17 etc..When optical system 34 is selected
When the three-dimensional galvanometer laser scanning system of dynamic focusing mode, any device can not be placed in cavity 15.Upper window 13 is under
Window 14 is laser see-through window, and material is for example microcrystalline quartz glass, heat-resisting up to 1500 DEG C or more.Cold air passes through cold air
Import 11 enters, and dividing cold air by the multilayer spoiler of air inlet grid 12 is multilayer laminar flow cold air, and laminar flow cold air is passed through cavity 15
Afterwards realize multilayer it is air-cooled, heat exchange with it is heat-insulated, the laminar gas after heat exchange enters exhaust grille 17 and is discharged by cold air outlet 16.First
Protective layer 1 recently, itself has the function of isolation forming cavity 4 and 34 heat transfer of top optical system apart from shaped cavity 4,
In addition to this, graphite plate 18 is preferably used with the heat-insulated of shaped cavity 4.Graphite plate 18 is placed in 15 lower part of cavity, with allusion quotation
The heat transfer anisotropy of type is conducted heat along plate plane XY, and perpendicular to plate plane Z to hardly conducting heat.18 lower layer of graphite plate is
Metal frame 19 plays a supporting role to graphite plate 18 and top protective layer.
Referring to Fig. 3, the second protective layer 2 is water-cooling structure layer, is main thermal insulation layer, is placed at the first protective layer 1 and the
Among three protective layers 3, main component is water-cooling base plate 21 and water cooling temperature sensor 22；The water-cooling base plate 21 has built-in
Follow-cooling passageway 211, cooling water inlet 212, cooling water outlet 213；Water-cooling base plate material is preferably high thermal conductivity steel, cooling medium
It is for example water.Follow-cooling passageway 211 built in water-cooling base plate 21 is preferably designed as S type serpentine flow-channels in the present invention, flow direction
As see arrows 17 in fig 3, cooling water outlet 213 is extended to by the folding of 212 curve of cooling water inlet, water-cooling base plate 21 can increase material by metal
Manufacturing method is made, and built-in follow-cooling passageway 211 freely can be designed and be manufactured by threedimensional model, to reach maximum
Radiating efficiency.Cold water integrally carries out substrate by the follow-cooling passageway 211 that cooling water inlet 212 enters inside water-cooling base plate 21
It is cooling, it is flowed out after heat exchange by cooling water outlet 213, the water of outflow enters external circulating cooling through pipeline and pumps cooling, heat exchange cooling
Water afterwards reenters cooling water inlet 212 and cools down to water-cooling base plate 21.Water cooling temperature sensor 22 is placed in water-cooling base plate 21
Top monitoring substrate upper temp, the temperature of recirculated cooling water is adjusted with this.Carbon fiber supporting pad is equipped with below water-cooling base plate 21
23, on the one hand play the role of support and sealing, on the other hand plays heat insulation.There is metal below carbon fiber supporting pad 23
Frame 24 plays a supporting role to the second protective layer 2.
If Fig. 4 and Fig. 5 are more particularly shown in, third protective layer 3 is air-cooled structure layer, is used for in laser thereon
Optical module 34 plays the role of wind cooling temperature lowering.The laser optics module 34 mainly includes laser 341, beam expanding lens 342, quartz
Pipe 343, plane mirror 344, dynamic focusing system 345, objective lens 346, scanning galvanometer 347 etc..The dynamic focusing system
345 by Z axis actuating motor, removable focus lamp and static objective lens at.The quartz ampoule 343 for optical path protect, isolation with
External gas exchanges.For the response speed for improving dynamic focusing system 345, the moving distance of dynamic focusing system focus lamp compared with
Short, within ± 5mm, the object lens of auxiliary can amplify the adjustment effect of focus lamp, to realize in entire working face
Within limits by the focal beam spot control of scanning element.The scanning galvanometer 347 includes X-axis scanning galvanometer and rotation electricity
Machine, Y axis scanning galvanometer and rotary electric machine.
For third protective layer of the invention, be preferably designed to the double air duct structures being arranged from inside to outside namely
It include interior air duct and outer air duct；Wherein the interior air duct is by all components for the laser optics module being mounted on horizontal panel
It is placed in wherein, and executes air-cooled cooling by means of the cold air that air inlet enters；The outer air duct is then used for institute
It states interior air duct to be placed in one, thus other heat sources are thermally shielded with outside.
More specifically, as shown in figure 5, double air ducts 35 include interior air duct 351 and outer air duct 352, with laser optics mould
All components of block 34 are placed on horizontal panel 32, and fiberglass packing 31 is placed below horizontal panel 32.Double air ducts 35 and first
Protective layer 1 can preferably share same cold air source.The laser optics module 34 is placed in interior air duct 351, and cold air passes through air inlet
Mouthful enter interior air duct 351 and air-cooled cooling carried out to all components of optical system 34, outer air duct 352 be used for and air duct 35 outside other heat
Amount source is thermally shielded.Wind chill temperatures sensor 33 is placed close to laser 341, for monitoring the temperature of laser 341, when sharp
When light device 341 is more than critical operating temperatures, entire selective laser sintering equipment alarms and stops working.
In addition, the lens vibrating type laser scanning system currently used for selective laser sintering system mainly includes using F-theta
The 2-D vibration mirror laser scanning system of lens focus mode and the three-dimensional galvanometer laser scanning system two for using dynamic focusing mode
Seed type is mainly determined according to scanning field of view size, the size of working face focal beam spot and operating distance etc..Of the invention
The protection of optics heating power and a kind of high-temperature laser constituency of independent temperature control of cooling system term are sintered frame structure, it is suitable for simultaneously
The 2-D vibration mirror laser scanning system of F-theta lens focus mode and the three-dimensional galvanometer laser scanning of dynamic focusing mode
System, therefore do not influenced by work top size, i.e., chores table top is applicable in.
A preferred embodiment according to the invention, above-mentioned optics heating power protection and cooling system can also preferably configure
There is an insulation compoboard to work together.
It in the present embodiment may include lens vibrating type laser scanning system, send as shown, laser chooses agglomerating plant
Powder cavity, shaped cavity and insulation compoboard.Wherein the lens vibrating type laser scanning system includes providing the laser of work light
And its matched lens module, its integral arrangement will work on the top of the shaped cavity, and by laser see-through window
Light source exposes to the powder on forming cavity table top to carry out selective laser sintering.The powder feeding cavity is arranged in the shaped cavity
Left side, and including scraper plate, powder feeding cylinder, powder feeding chamber table top and powder falling slot etc., wherein scraper plate is at work along horizontal cross side
To namely X-direction move so that the appropriate powder on the powder feeding chamber table top send to the shaped cavity and is controllably connected
At the logical powder falling slot, then fall to that the forming cavity is intracorporal to connect dust feeder；In addition, the powder feeding inside cavity is also set up
There is the first infrared radiation heating device, first infrared radiation heating device is as auxiliary heating element and plays main heating function
Can powder feeding cylinder cooperating together, and the preheating for executing independent temperature control to the powder on the powder feeding chamber table top is grasped
Make.The shaped cavity further includes formation cylinder, the second infra-red radiation other than including the forming cavity table top and connecing dust feeder
Heating device and powder leakage cylinder, wherein this connects dust feeder for tiling the powder from the powder feeding cavity to the forming cavity platform
Face carries out selective laser scanning to it followed by the work light；Second infrared radiation heating device is as auxiliary
Heating unit cooperating together with the forming for playing main heating function is helped, and on the forming cavity table top
Powder executes the heating operation of independent temperature control；In addition, the powder leakage cylinder is recycled again sharp for receiving powder extra when powdering
With；
In particular, for being insulated compoboard 5, as shown in Figure 1, it is arranged in lens vibrating type laser scanning system 7, powder feeding
Between cavity 6 and shaped cavity 4, and for mutual effectively heat-insulated to being realized between three；The insulation compoboard 5 by for pair
The first compoboard 51 that Y-Z axial plane direction is thermally shielded and the second compoboard for being thermally shielded to X-Y axial plane direction
52 are composed, and wherein Y axis direction is defined as horizontal longitudinal direction, and Z axis is defined as vertical direction；In addition, first,
Two compoboards 51,52 include the graphite plate 511,521 that multilayer is spaced each other and insulation material layer 512 along thickness direction with shape
At more sandwiches, and when compoboard is arranged along X-Y axial plane, these graphite plates and the powder feeding chamber table top keep flat
Row, and when compoboard is arranged along Y-Z axial plane, these graphite plates are vertical with the powder feeding chamber table top holding.By this method,
The frame structure of this independent temperature control can guarantee the uniformity and forming table top of powder feeding table top powder preheating temperature field simultaneously
The uniformity of processing temperature field, the powder of powder feeding cavity table top just can reach sinterable temperature before powder feeding, and there is no bean jellies to send
A possibility that situation to sintering melt, reduced part warpage, while actual sintered delay time can be reduced, it improves practical
It is sintered efficiency.The frame structure of independent temperature control of the invention is particularly suitable for high-performance polymer such as poly(aryl ether ketone), poly- virtue
Amide carries out 400 DEG C of high-temperature laser sintering.
To sum up, optics heating power protection proposed by the invention and cooling system by be laminated the first protective layer (air-cooled layer),
Second protective layer (water-cooled layer) and the common image of third protective layer (air-cooled layer), can not only realize and be formed to entire optical system
Effective heating power protection and cooling, are in laser and other optical components in operating temperature range, and can also ensure that
Even if can also be carried out with security and stability under 400 DEG C of high-temperature laser constituency sintering operating condition, it is therefore particularly suitable for for example extraordinary poly-
Close the application of object material SLS molding etc.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency, which is characterized in that the optics heating power
Protection and cooling system integral arrangement in the shaped cavity top of selective laser sintering equipment, and along short transverse by down toward
On be divided into the first protective layer (1), the second protective layer (2) and third protective layer (3) stacked gradually, in which:
First protective layer (1) is presented the form of air-cooled structure layer and is laid on the top of the shaped cavity, and including being located at
The cold air import (11) of the left and right sides and cold air outlet (16), upper window (13) and lower window positioned at upper and lower two sides
(14), the cavity (15) for surrounding and being formed and is closed in central region；After wherein cold air enters via the cold air import (11)
Multilayer laminar flow cold air is separated by the multilayer spoiler of air inlet grid (12), then passes to the cavity (15) to execute multilayer
Heat exchange with it is heat-insulated；Laminar gas after heat exchange continues through exhaust grille (17) and is discharged by the cold air outlet (16)；In addition, institute
State window and lower window collectively form a laser perspective path, and for laser beam through reach be located at it is described at
The forming table top (41) of shape cavity lower part；
Second protective layer (2) is presented the form of water-cooling structure layer and continues the top for being laid on first protective layer, and wraps
Include water-cooling base plate (21) and water cooling temperature sensor (22)；Wherein the water-cooling base plate (21) has built-in follow-cooling passageway
(211), and it folds from cooling water inlet (21) curve and extends to cooling water outlet (213), thus by means of flowing through in the cold of its
But medium plays cooling function；The water cooling temperature sensor (22) is then for the top environment temperature to the water-cooling base plate
It is monitored, and provides monitoring feedback data to adjust the inflow temperature value of circulating cooling medium in real time；
The third protective layer (3) is presented the form of air-cooled structure layer and continues the top for being laid on second protective layer, and wraps
Include the double air ducts being arranged from inside to outside namely interior air duct (351) and outer air duct (352)；Wherein the interior air duct (351) will install
All components of laser optics module on horizontal panel are placed in wherein, and the cold air entered by means of air inlet
To execute air-cooled cooling；The outer air duct is then used to for being placed in one in the interior air duct, thus carried out with other external heat sources every
Heat.
2. a kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency as described in claim 1, special
Sign is, for first protective layer, its cavity (15) lower part is preferably additionally provided with a graphite plate (18),
And by its along plate in-plane execute heat transfer, in the direction perpendicular to plate plane almost it is adiabatic heat transfer it is each to different
Property further increases heating power protection effect.
3. a kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency as claimed in claim 1 or 2,
It is characterized in that, for second protective layer, its water-cooling base plate (21) lower part is preferably additionally provided with a carbon fiber
It ties up supporting pad (23), thus while playing support and sealing function, also acts as further heat-insulated effect.
4. a kind of protection of optics heating power and cooling system for the sintering of high-temperature laser constituency as claimed in claim 3, special
Sign is that the material of the water-cooling base plate is preferably high thermal conductivity steel, and is preferably made by metal increasing material manufacturing method.
5. a kind of protection of optics heating power and cooling for the sintering of high-temperature laser constituency as described in claim 1-4 any one
System, which is characterized in that for the third protective layer, it is also preferable to include wind chill temperatures sensor (33), this is air-cooled for it
Temperature sensor close to the laser optics module laser and place, and for executing prison in real time to the temperature of this laser
It surveys.
6. a kind of protection of optics heating power and cooling for the sintering of high-temperature laser constituency as described in claim 1-5 any one
System, which is characterized in that the protection of above-mentioned optics heating power and cooling system preferably apply to the two dimension of F-theta lens focus mode
The three-dimensional galvanometer laser scanning system of galvanometer laser scanning system or dynamic focusing mode.
7. a kind of protection of optics heating power and cooling for the sintering of high-temperature laser constituency as claimed in any one of claims 1 to 6
System, which is characterized in that optics heating power protection and cooling system are preferably further equipped with insulation compoboard and work altogether；It is described exhausted
Hot compoboard is arranged between lens vibrating type laser scanning system, powder feeding cavity and shaped cavity, and for realizing between three
It is mutual effectively heat-insulated；The insulation compoboard by for being thermally shielded to Y-Z axial plane direction the first compoboard and for pair
The second compoboard that X-Y axial plane direction is thermally shielded is composed, and wherein Y direction is defined as horizontal longitudinal direction, Z axis
It is defined as vertical direction；In addition, the first, second compoboard along thickness direction include the graphite plate that multilayer is spaced each other and
To form more sandwiches, and when compoboard is arranged along X-Y axial plane, these graphite plates are sent insulation material layer with described
Powder chamber table top keeping parallelism, and when compoboard is arranged along Y-Z axial plane, these graphite plates and the powder feeding chamber table top are kept
Vertically.
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