CN106564187A - Method and equipment for manufacturing three-dimensional object - Google Patents
Method and equipment for manufacturing three-dimensional object Download PDFInfo
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- CN106564187A CN106564187A CN201610990218.5A CN201610990218A CN106564187A CN 106564187 A CN106564187 A CN 106564187A CN 201610990218 A CN201610990218 A CN 201610990218A CN 106564187 A CN106564187 A CN 106564187A
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- powder
- preheating
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- laser
- scanning
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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
-
- 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
-
- 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
- B22F10/36—Process control of energy beam parameters
- B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- 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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- 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
Abstract
The invention describes a method for achieving manufacturing of a three-dimensional object by conducting layer-by-layer scanning on a powder layer through an energy bundle. The method comprises the steps that a powder material layer is paved on a base plate or a cured layer, so that the powder layer is formed; part of or more areas of the powder layer are preheated through a preheating light beam, so that the temperature of powder in the preheated areas reaches a set value, wherein setting of the preheating light beam is matched with absorption efficiency of the powder; selective scanning is conducted on the corresponding cross section positions, in the preheated areas, of the three-dimensional object through the energy bundle, and curing of the powder layer is completed, wherein the preheating light beam is a laser beam with the single wave length; and after homogenization is conducted and the light beam uniform in energy distribution is formed and diverged, preheating is conducted on the preheated areas. By means of the method, a powder material adopted in the powder bed additive manufacturing technology can be preheated rapidly and efficiently, and thus the temperature difference generated between the three-dimensional object and the surrounding environment when the three-dimensional object is manufactured is reduced; generation of internal stress is reduced; and manufacturing quality of the three-dimensional object is improved.
Description
Technical field
The present invention relates to the method and relevant device of a kind of manufacture three-dimensional body by energy beam action powder successively.
Background technology
Common increasing material manufacturing method includes utilizing energy beam（Such as laser or electron beam）Layer is sent in the paving of dusty material
On be selectively scanned, it is and cumulative by scanning successively solidification and finally obtain three-dimensional body.The scanning of energy beam
Position is three-dimensional body to be manufactured at this layer of corresponding cross section position, the dusty material corresponding to the position with energy
After Shu Zuoyong, temperature is raised rapidly, moment realize melt material and after the cooling period realize solidification connection, one layer scanning after the completion of
Continue paving on the scanning slice for completing and send one layer of new powder, according to three-dimensional body at the corresponding cross section position of new powder bed
Scanning.
In scanning process, due to energy concentrate cause zone of action temperature to raise and with around form larger temperature difference.
As a example by precinct laser sintering or selective laser melting process with laser as energy source, laser scanning region receives laser energy temperature
Degree raise, with the non-scanning area of surrounding or cooled region formed the temperature difference, so as to internal stress is produced inside three-dimensional body, seriously
When can cause three-dimensional body occur buckling deformation, or even cause fracture.Prior art is generally in the working chamber of laser sintered equipment
Infrared radiation heater is set in vivo, dusty material to be scanned is preheated, so as to reduce laser scanning region and surrounding
The thermograde in region, improves the workmanship of three-dimensional body.But have problems in that, infrared radiation heater radiation wavelength
Wider range, powder affect the hygral equilibrium on powder surface to different wave length absorptive rate of radiation difference, and dusty material is inhaled
The time for receiving infra-red radiation to design temperature is longer, more because the low directivity that radiates of heater so that working cavity also can be because
Radiate and heat up, so as to the temperature tolerance for proposing higher to the element in cavity and cavity is required.Prior art is being made
Make setting heater below the laser sintered equipment substrate of metal three-dimensional body to preheat substrate, by the conduction of heat of substrate
Three-dimensional body is incubated, but substrate transmission thermal resistance is big, heat transfer efficiency is relatively low and heats up time-consuming longer.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of method and apparatus of manufacture three-dimensional body, can
Quickly and efficiently rate to being preheated using the dusty material in powder bed increases material manufacturing technology, exist so as to reduce three-dimensional body
Temperature difference during manufacture with surrounding, reduces the generation of internal stress, improves the workmanship of three-dimensional body.
For achieving the above object, present invention employs following technical scheme：
A kind of method for realizing three-dimensional body manufacture to powder bed scanning by energy beam successively, comprises the steps：
（1）One layer of dusty material paving is sent on base plate or the layer having cured, powder bed is formed；
（2）Preheating light beam implements preheating at least part of region of powder bed, makes the powder temperature of preheated zone reach setting value,
The absorption efficiency of the setting and powder that wherein preheat light beam matches；
（3）Scanning is implemented at the energy beam cross section position corresponding in preheated zone to three-dimensional body, completes consolidating for powder bed
Change；
（4）Repeat step（1）Extremely（3）, until completing the manufacture of three-dimensional body；
Wherein, it is, by the laser beam of single wavelength, to homogenize to form the uniform light beam of Energy distribution and after diverging to preheat light beam,
Preheated zone is implemented to preheat.
Further, the preheated zone is at least divided into a preheating unit region, and the preheating light beam is to preheating unit
Preheating is implemented in region successively, makes the powder temperature of preheated zone reach setting value.
Further, the preheated zone at least includes three-dimensional body at the corresponding cross section position of powder bed.
Further, energy beam reaches setting value or in part preheating unit region powder temperature in preheated zone powder temperature
Degree reach setting value when, open to three-dimensional body the corresponding cross section position of powder bed scanning.
Present invention additionally comprises it is a kind of by energy beam successively to three-dimensional body to be manufactured in the corresponding horizontal stroke of powder bed
The equipment of three-dimensional body manufacture is realized in section parts scanning, including,
Powder spreader, for dusty material paving to be sent the layer in base plate or selectivity solidification, forms powder bed；
Energy source, for producing energy beam, energy beam is imported on powder bed and is selectively scanned, wherein the position scanned
It is three-dimensional body to be manufactured at this layer of corresponding cross section position；
Working cavity, there is provided a closing working region, energy beam realize the scanning to powder bed, working chamber in working cavity
Air flow inlet and air stream outlet are set in vivo, protection air-flow is introduced；
Pre-heating system, for, before energy beam scanning, implementing preheating to the powder of preheated zone in powder bed；
Wherein, the pre-heating system includes laser cell, beam homogenization unit, beam divergence unit and control unit, laser list
Laser-beam transformation is uniformly homogenized light beam into Energy distribution by unit's transmitting laser beam, beam homogenization unit, and beam divergence unit will
Preheating light beam is formed after homogenizing beam divergence, implements adjustable radiation preheating, the unlatching of laser cell and pass to preheated zone
Close, the regulation of laser beam power size and the regulation of preheated zone are completed by control unit.
Further, laser instrument of the laser cell for single wavelength.
Further, the pre-heating system includes beam deflecting element, for entering horizontal deflection to the preheating light beam, will be pre-
Hot light beam imports the preheated zone of setting in working cavity.
Further, the pre-heating system includes temperature detecting unit, is arranged in working cavity, for detecting preheating zone
The temperature in domain, and feed back to control unit.
Further, the pre-heating system includes heat exchange unit, is arranged at air flow outlet, for there is heat with air-flow
Exchange, adjustment work cavity inner temperature.
Further, the heat exchange unit is shell-and-tube heat exchanger.
The method according to the invention, it is adaptable to sent on layer selectively using the energy beam paving to dusty material successively
Scanning ultimately forms three-dimensional body, and by, before energy beam scanning dusty material, introducing the laser beam with single wavelength, this swashs
Light beam is matched with the absorbance of dusty material, and after homogenizing and dissipating, the dusty material for treating scanning area implements preheating,
Reduce the temperature difference risen sharply with surrounding formation because of the temperatures at localized regions that energy beam scanning causes, reduce the product of internal internal stress
It is raw, improve the workmanship of three-dimensional body.The method has advantages below：
（1）Powder is implemented to preheat using the laser that wavelength is single, directivity is high, powder absorbs the laser of Same Wavelength and easily realizes
Hygral equilibrium, directivity is high in addition causes laser not cause the temperature of working cavity to raise to surrounding diverging；
（2）Suitable laser instrument can be selected according to the property of powder, laser energy is absorbed by powder to greatest extent, reduce
Powder causes the temperature of working cavity to raise to the reflection of laser；
（3）The pre- heat energy of laser is used so that powder reaches the temperature of setting in moment, efficiency is improve；
（4）Laser through homogenizing and dissipating can make the powder of preheated zone form uniform temperature field at short notice, effectively
The generation of stress is reduced, the workmanship of three-dimensional body is improve；
（5）Can further improve the manufacture of 3 d part by laser power being improved by powder rapidly pre-warming to higher temperature
Quality, and reduce the heat affecting to working cavity interior element.
Description of the drawings
Fig. 1 is an example of the equipment for successively solidifying manufacture three-dimensional body according to the present invention by powder；
Pre-heating systems of the Fig. 2 for equipment shown in Fig. 1；
Fig. 3 is an example for carrying out subregion preheating according to the present invention to powder bed.
Description of symbols in figure：
1st, moulding cylinder bearing；2nd, for powder cylinder bearing；3rd, substrate；4th, Powder spreader；5th, working face；6th, scan deflection mirror；7th, window
Mirror；8th, preheat deflecting mirror；9th, preheat laser instrument；10th, homogenizer；11st, divergent mirror；12nd, controller；13rd, hygrosensor；14、
Driving means；15th, air stream outlet；16th, heat exchanger；17th, moulding cylinder；18th, for powder cylinder；19th, three-dimensional body；20th, framework；21、
Scanning light beam；22nd, preheat light beam；23rd, scan laser.
Specific embodiment
Below with reference to Fig. 1 and Fig. 2 explanations exemplary equipment for manufacturing three-dimensional body of the invention and its pre-
Hot systems.
As shown in figure 1, being a kind of a kind of specific embodiment of the equipment that can perform the present invention, it is a kind of precinct laser fusion
Equipment.The laser fusion equipment has the moulding cylinder 17 of a upward opening, arranges one to be formed for supporting in moulding cylinder 17
Three-dimensional body 19 bearing 2, bearing 2 can vertically move up and down in moulding cylinder 17 by driving means 14.
The top edge of moulding cylinder 17 determines working face 5.Scan laser 23 is provided with above working face 5, is launched
Go out scanning light beam 21 and imported to by scan deflection mirror 6 and be scanned on working face 5, the regional location of scanning is to be manufactured
Three-dimensional body 19 at the corresponding cross section position of working face 5.Pre-heating system is additionally provided with above working face 5, wherein by
After homogenizer 10 is homogenized and dissipated with divergent mirror 11, preheated deflecting mirror 8 imports work and puts down preheating laser instrument 9 transmitting laser beam
Implement preheating, the opening and closing of the control preheating laser instrument 9 of controller 12 and the tune of power output size in the preheated zone in face 5
Section and the position adjustments of preheated zone.Equipment also includes Powder spreader 4, for one layer of dusty material paving to be solidified is sent to substrate
3 surfaces have been scanned on the powder bed of solidification, and Powder spreader 4 can be moved back and forth on working face 5, on working face 5
Powder upwards moves offer by bearing 1 by for powder cylinder 18.Framework 20 is by working face 5 and provides more than powder plane domain
Region and surrounding separate to form working cavity, prevent dusty material from aoxidize in laser scanning, scanning light beam 21 and preheat
Light beam 22 can enter working cavity by window mirror 7, be provided with hygrosensor 13, for detecting preheating zone in working cavity
The temperature in domain, and detectable signal is fed back to into controller 12.
Equipment is additionally provided with air flow inlet（Not shown in figure）, above the side of working face in working cavity 5, air-flow leads to
Gas transmission pipeline is crossed from air flow inlet input service cavity, and an orientation blows over working face 5, from relative with air flow inlet
Opposite side air stream outlet 15 flow out, at the air stream outlet 15 outside working cavity, be additionally provided with heat exchanger 16, the steam of outflow
Body enters heat exchanger 16, lowers the temperature, the heat in working cavity is taken out of, it is to avoid working chamber body temperature after exchanging heat with cooling water
It is too high and make cavity interior element be damaged, the gas after cooling and again from air flow inlet input service cavity formation circulating current.
Preferably, this heat exchanger can be arranged to a kind of shell-and-tube heat exchanger.
Shown in Fig. 2, the operation principle of pre-heating system is as follows：It is equal on substrate 3 (or on the powder bed having cured) surface
The powder of a thickness is laid evenly, and the preheating transmitting laser beam of laser instrument 9 is by, after homogenizer 10, being converted into special shape
Homogenize light beam, it is uniform to homogenize beam and focus Energy distribution, sharpness of border, non-stop layer bright spot.Light beam is homogenized through divergent mirror 11
Preheating light beam 22 is formed afterwards, by controlling its direction of motion, preheating light beam 22 is directed into into the preheated zone of powder.Due to light beam
Homogenized, the uniform light beam irradiation of Energy distribution is subject in the short time of preheated zone and is rapidly heated, hygrosensor 13 is sentenced
Whether disconnected preheated zone powder surface temperature rises to designated value, and feeds back to the output that control unit 12 adjusts preheating laser instrument 9
Power.After temperature conditionss are met, after the transmitting 21 scanned deflecting mirror 6 of scanning light beam of scan laser 23, press in working face
According to the solidification of the path start powder last layer of setting.After the completion of one layer of powder curing, bearing 2 declines the height of a thickness, paving
Powder device 4 is sent to one layer of new dusty material paving on the powder bed for scanning solidification, repeats said process until completing all layers
Solidification obtain three-dimensional body.
It should be noted that the present embodiment be based on manufacture metal three-dimensional body selective laser melting process on implement,
In order to realize that metal dust is absorbed to greatest extent to preheating laser beam energy, generally optional preheating laser instrument is wavelength
The semiconductor laser of 808nm, 940nm or 920nm, or wavelength 1000nm optical fiber laser and wavelength 532nm or
The solid state laser of 1064nm, metal powder material are high to the laser beam energy absorbance of these types, do not easily cause working chamber
The intensification of body.If based on manufacture nonmetallic materials（Such as nylon）The Selective Laser Sintering of three-dimensional body is implemented, and leads to
Wavelength can often be selected for the CO of 10640nm2Laser instrument.
Preheating light beam is adjustable for the selection of preheated zone.A kind of optional scheme is that preheated zone is as far as possible
New powder bed is covered comprehensively, and now hygrosensor need to only detect the temperature of powder bed and signal is fed back to pre-heating system
Control unit, control unit are computed adjusting the laser output power of preheating laser instrument in the unit interval and implement pre- to powder bed
Heat so that whole powder bed can quickly form a temperature field in a balanced way at short notice, and hygrosensor detects powder bed
When reaching design temperature, scanning light beam just can scanning program curing of the Rapid Implementation to powder bed.
If the cross-sectional area of three-dimensional body is larger, the powder bed area in working cavity is larger, for single laser
Pre-heating system is difficult to disposable overall preheating, in addition to using multiple pre-heating systems, if can also be divided into powder bed
A dry region is processed.As shown in figure 3, powder bed is divided into 4 working regions, preheating light beam is can be with the feelings of overlay area 1
Under condition, first implement preheating to powder in region 1, subsequently preheating light beam can jump to region 2,3,4 successively, realize powder bed
Preheating, hygrosensor when integrated powder layer temperature arrival setting value is detected, just can be implemented for powder bed by scanning light beam
Scanning program curing.Preheating light beam redirect can arrange in pre-heating system deflecting mirror or by the bounce of deflecting mirror come
Realize, or arrange driving means driving pre-heating system motion to complete the preheating in all regions.
For the preheating of subarea processing, scanning light beam can also be implemented for the scanning program curing of powder bed：
When preheating light beam completes the preheating in region 1, scanning light beam implements scanning program curing to region 1；Preheating light beam completes region 2
Preheating when, scanning light beam just can implement the scanning program curing to region 2；Other regions can be carried out successively, also dependent on reality
Border demand implements the scanning solidification in the region when part preheated zone reaches design temperature, without waiting for integrated powder layer to setting
Constant temperature degree realizes dynamic equilibrium, and in this case, temperature sensing is carried out for preheated zone, and hygrosensor can
Using contactless temperatuer detector.If the method for this instant scanning comparatively fast makes preheated zone because of metal material heat conduction
Heat causes the temperature decrease of the preheated zone to other regional divergences, and preheating light beam can be preheated in the region always,
The temperature in the region is maintained, until starting to redirect the preheating and scanning that carry out subsequent region after the end of scan.
Relative to traditional heating mode, the pre-heating mean of the present invention make use of good directivity, and laser energy is effective
It is limited in preheated zone.Direct effect by preheating laser beam, the powder temperature of preheated zone can reach at short notice
Setting value, while the preheating light beam after homogenizing, Energy distribution equilibrium, can cause preheated zone to be rapidly achieved dynamic balance temperature.
The method can quickly realize preheating, effectively reduce 3 d part internal stress, and reduce the hot shadow to working cavity interior element
Ring, the method can also further improve three-dimensional zero by improving laser power by powder rapidly pre-warming to higher temperature in addition
The workmanship of part.
Embodiment described above only expresses concrete a kind of embodiment of the present invention, it is noted that for ability
For the those of ordinary skill in domain, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these
Belong to protection scope of the present invention.
Claims (10)
1. a kind of method for realizing three-dimensional body manufacture to powder bed scanning by energy beam successively, comprises the steps：
（1）One layer of dusty material paving is sent on base plate or the layer having cured, powder bed is formed；
（2）Preheating light beam implements preheating at least part of region of powder bed, makes the powder temperature of preheated zone reach setting value,
The absorption efficiency of the setting and powder that wherein preheat light beam matches；
（3）Scanning is implemented at the energy beam cross section position corresponding in preheated zone to three-dimensional body, completes consolidating for powder bed
Change；
（4）Repeat step（1）Extremely（3）, until completing the manufacture of three-dimensional body；
Characterized in that, preheating light beam is, by the laser beam of single wavelength, to homogenize to form the uniform light beam of Energy distribution and pass through
After diverging, preheated zone is implemented to preheat.
2. method according to claim 1, it is characterised in that the preheated zone is at least divided into a preheating unit area
Preheating is implemented in domain, the preheating light beam successively to preheating unit region, makes the powder temperature of preheated zone reach setting value.
3. method according to claim 1 and 2, it is characterised in that the preheated zone at least includes three-dimensional body in powder
The corresponding cross section position of last layer.
4. method according to claim 3, it is characterised in that energy beam preheated zone powder temperature reach setting value or
When in part preheating unit region, powder temperature reaches setting value, open to three-dimensional body in the corresponding transversal face of powder bed
The scanning of position.
5. it is a kind of by energy beam successively to powder bed scanning realize three-dimensional body manufacture equipment, including,
Powder spreader, for dusty material paving to be sent the layer in base plate or selectivity solidification, forms powder bed；
Energy source, for producing energy beam, energy beam is imported on powder bed and is selectively scanned, wherein the position scanned
It is three-dimensional body to be manufactured at this layer of corresponding cross section position；
Working cavity, there is provided a closing working region, energy beam realize the scanning to powder bed, working chamber in working cavity
Air flow inlet and air stream outlet are set in vivo, protection air-flow is introduced；
Pre-heating system, for, before energy beam scanning, implementing preheating to the powder of preheated zone in powder bed；
Characterized in that, the pre-heating system includes laser cell, beam homogenization unit, beam divergence unit and control unit,
Laser cell launches laser beam, and laser-beam transformation is uniformly homogenized light beam, beam divergence into Energy distribution by beam homogenization unit
Unit will be homogenized, implement adjustable radiation preheating to preheated zone, and laser cell is opened
Open and close, the regulation of laser beam power size and the regulation of preheated zone are completed by control unit.
6. equipment according to claim 5, it is characterised in that laser instrument of the laser cell for single wavelength.
7. equipment according to claim 6, it is characterised in that the pre-heating system includes beam deflecting element, for right
The preheating light beam enters horizontal deflection, and preheating light beam is imported the preheated zone set in working cavity.
8. equipment according to claim 6, it is characterised in that the pre-heating system includes temperature detecting unit, is arranged at
In working cavity, for detecting the temperature of preheated zone, and control unit is fed back to.
9. the equipment according to any one of claim 5-8, it is characterised in that the pre-heating system includes heat exchange unit,
Air flow outlet is arranged at, for there is heat exchange, adjustment work cavity inner temperature with air-flow.
10. equipment according to claim 9, it is characterised in that the heat exchange unit is shell-and-tube heat exchanger.
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| CN108188398A (en) * | 2018-03-22 | 2018-06-22 | 宁波蓝野医疗器械有限公司 | A kind of powder rapidly pre-warming method and apparatus for selective laser melting unit |
| CN108372659A (en) * | 2018-02-07 | 2018-08-07 | 西安康拓医疗技术有限公司 | Subregion pre-heating device based on mask and its subregion pre-heating mean |
| CN108705083A (en) * | 2018-05-31 | 2018-10-26 | 华中科技大学 | A kind of real-time pre-heating system of selective melting powder and method based on multi-laser |
| CN108788147A (en) * | 2017-04-28 | 2018-11-13 | 戴弗根特技术有限公司 | Powder bed fuses beam scanning |
| CN109047761A (en) * | 2018-08-24 | 2018-12-21 | 西安科技大学 | A kind of metal increasing material manufacturing technique |
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| CN113543911A (en) * | 2019-03-04 | 2021-10-22 | Slm方案集团股份公司 | Device and method for producing three-dimensional workpieces |
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| CN109968664A (en) * | 2019-03-28 | 2019-07-05 | 湖南华曙高科技有限责任公司 | Three-dimension object manufacturing equipment, preheating device and cylinder body heating mechanism |
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| CN110641016A (en) * | 2019-09-16 | 2020-01-03 | 杭州德迪智能科技有限公司 | Three-dimensional powder forming device and method |
| CN110773737A (en) * | 2019-11-14 | 2020-02-11 | 杭州琼网计算机网络有限公司 | Selective laser melting prevents warp deformation's 3D printer |
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