CN207823960U - The 3D printing device of oral devices - Google Patents
The 3D printing device of oral devices Download PDFInfo
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- CN207823960U CN207823960U CN201721928094.4U CN201721928094U CN207823960U CN 207823960 U CN207823960 U CN 207823960U CN 201721928094 U CN201721928094 U CN 201721928094U CN 207823960 U CN207823960 U CN 207823960U
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- oral devices
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- printing device
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- 238000010146 3D printing Methods 0.000 title claims abstract description 67
- 238000000465 moulding Methods 0.000 claims abstract description 64
- 238000007493 shaping process Methods 0.000 claims abstract description 61
- 238000007639 printing Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000003892 spreading Methods 0.000 claims abstract description 9
- 230000007480 spreading Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 73
- 230000007246 mechanism Effects 0.000 claims description 43
- 239000000843 powder Substances 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000000835 fiber Substances 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 12
- 230000005855 radiation Effects 0.000 claims description 10
- 238000012876 topography Methods 0.000 claims description 7
- 230000005389 magnetism Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 29
- 230000008569 process Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000013307 optical fiber Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 40
- 238000005516 engineering process Methods 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000002826 coolant Substances 0.000 description 6
- 230000003028 elevating effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 210000000214 mouth Anatomy 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 239000000112 cooling gas Substances 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004053 dental implant Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
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- 238000007781 pre-processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- 238000005482 strain hardening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000028016 temperature homeostasis Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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Abstract
A kind of 3D printing device of oral devices, including forming worktable, power spreading device, first laser module, second laser module and laser control module, wherein, the laser control module controls the printable layer that the first laser module output continuous laser scanning molding forms oral devices, after exporting pulse laser progress Precision Machining, the second laser module carries out micro-structure to the printable layer of the oral devices and subtracts material processing.The 3D printing device of oral devices provided by the utility model sends out continuous laser and pulse laser respectively using the optical fiber laser first laser device of high stability, it is molded by first laser device scanning after forming the printable layer of oral devices and carrying out Precision Machining, micro-structure is carried out to printable layer by second laser and subtracts material processing, it no longer needs to carry out follow-up grinding process to the oral devices of 3D printing, printing shaping has precision height and simplifies production process.
Description
Technical field
The utility model is related to a kind of laser 3D printing technology more particularly to a kind of 3D printing dresses for oral devices
It sets.
Background technology
Precinct laser fusion (Selective Laser Melting, SLM) technology be in current metal 3D printing technique at
The highest forming method of type precision, SLM technologies are carried out in the babinet with protective atmosphere using high-density laser spot
The quick scanning of X-Y scheme makes molten metal dusty material be frozen into 20 μm -30 μm of thin layer, and successively accumulation is printed
Accurate 3D molded parts are widely used in aerospace, the precision parts of the industries such as biologic medical, implant devices manufacture.Arteries and veins
First laser device is rushed with advantages such as high stability, low cost, high-peak powers, is processed using this ultrafast pulsed laser device crisp
Firmly, ultra-thin materials, scarfing smooth (1.0 μm of roughness Ra ＜) belong to cold working, are current material micro Process fields without thermal damage
" the subversiveness technology " occurred.However, picosecond solid pulse laser of foreign countries' import at present is expensive, system complex, surely
Qualitative difference can not be applied to the Precision Machining of SLM rapid shapings at all.
Although SLM printing precision can reach 0.05mm-0.02mm, it is limited by powder size, laser focused spot size,
Successively material and technologies factor, the dimensional accuracy and surface roughness of SLM technology forming parts such as printing still cannot be satisfied
The required precision of high-accuracy parts.Accurate fitting people could be met by especially also needing to progress following process processing to oral devices
The high-precision requirement of body.
Utility model content
In view of this, it is necessary to provide a kind of 3D printing device of oral devices, it can meet that oral devices are high-precision to be wanted
It asks.
The utility model provides firstly a kind of 3D printing device of oral devices, the 3D printing device of the oral devices
Including：
Forming worktable is arranged in shaping work room；
Power spreading device, for being laid with powder in the forming worktable；
First laser module, including first laser device and the first scanning galvanometer, the first laser device include setting gradually
Continuous laser seed source and pulse laser seeds source, fiber coupler and fiber amplifier, the continuous laser seed source and
The light beam of pulse laser seeds source output exports continuous laser or pulse laser after fiber coupler and fiber amplifier；Institute
The first scanning galvanometer is stated for gathering continuous laser or pulse laser that the first laser device exports by the first scanning galvanometer
Powder of the coke on being laid on the forming worktable；
Second laser module, including second laser and mobile mechanism, the mobile mechanism are set to the shaping work
The top of platform, the second laser are connected to the mobile mechanism, and the mobile mechanism drives the second laser one
In horizontal plane transversely or longitudinal movement；
Laser control module is connect with the first laser module and second laser module respectively, for controlling described
One laser exports continuous laser and forms oral devices to the powder scanning molding being laid on the forming worktable
Printable layer, and control the first laser device and export after the pulse laser carries out Precision Machining to the printable layer, it is described
Second laser carries out micro-structure to the printable layers of the oral devices and subtracts material processing, is formed more with preset hole shape and aperture
Pore structure body.
Further, further include camera,
When molding plane by continuous laser scanning, the surface shape of the plane is obtained by the camera
Looks, and, it obtains the pulse laser and Precision Machining and the second laser is carried out to the face profile of the oral devices
The surface state that micro-structure subtracts material processing is carried out to the printable layer of the oral devices.
Further, the second laser along orthogonal both direction by being movably set to the shaping work
The top of platform.
Further, the second laser is picosecond or femto-second laser and the focal length model of the second laser
It encloses for 5~100mm.
Further, further include heat treatment mechanism, the heat treatment mechanism is for carrying out at preheating the shaping work room
Reason.
Further, the heat treatment mechanism includes the heating element being arranged on the forming worktable, for powder
It is preheated, and/or,
The heat treatment mechanism, in the indoor radiation source of the shaping work, is used for the first laser device including setting
The running orbit of the hot spot of the continuous laser sent out is heated.
Further, further include temperature control equipment, the temperature control equipment includes cooling body, thermal insulation board, heater
And temperature sensor, the cooling body include air cooling mechanism and magnetism servo-electric motor water-cooling, the air cooling mechanism includes that setting is followed in gas
Gas heat-exchanger on the pipeline of ring purifier and with the gas jetting hole, the gas jetting hole is used for described the
At least one of one scanning galvanometer, the second scanning galvanometer and laser light incident window carry out injection gas cooling；The magnetism servo-electric motor water-cooling packet
Interconnected cooling duct is included, there is the water-cooling channel water cooling entrance and water cooling to export, and the water-cooling channel is arranged
In the bottom surface of the side wall and moulding cylinder of the shaping work room.
Further, the thermal insulation board is set to the side wall of the shaping work room and the lower section of the moulding cylinder base station, and
And the edge of the thermal insulation board is connect with the moulding cylinder base station, forms a confined space, the heater is set to the confined air
In.
Further, the temperature sensor is set to the inner wall of the shaping work room and the court of the forming worktable
To the surface of the heater.
The utility model additionally provides a kind of 3D printing method of oral devices, and the 3D printing method includes：
Using power spreading device powder is laid in forming worktable；
The first laser device output continuous laser for controlling the first laser module is laid on the shaping work to described
Powder scanning molding on platform forms the printable layer of oral devices, and controls the first laser device and export the pulse laser
Precision Machining is carried out to the printable layer profile；
It controls the second laser and material processing is subtracted to the printable layer progress micro-structure of the oral devices.
Further, it is precision machined to be carried out to the printable layer to send out pulse laser for the control first laser device
Step includes：
After molding plane by continuous laser scanning, the surface shape of the plane is obtained by the camera
Looks, and, it obtains the pulse laser and Precision Machining and the second laser is carried out to institute to the plane of the oral devices
The printable layer progress micro-structure for stating oral devices subtracts the surface state after material processing；
Precision Machining is carried out to the printable layer face profile by the pulse laser.
Further, the second laser is picosecond or femto-second laser and the focal length model of the second laser
It encloses for 5~100mm.
Further, it is laid on to described in the first laser device output continuous laser of the control first laser module
Before the step of powder scanning molding on the forming worktable forms the printable layer of oral devices, further include：To it is described at
Type operating room carries out at hot reason, and the heat treatment includes：
The powder is heated by heating element, and/or,
By the light that the continuous laser sent out to the first laser device in the indoor radiation source of the shaping work is arranged
The running orbit of spot is heated.
Compared to the prior art, the 3D printing device of oral devices provided by the utility model uses the first of high stability
Laser sends out continuous laser and pulse laser respectively, and molding and finishing can be realized in an only laser, and stability is high, and
Cost is relatively low, after forming the printable layer of oral devices by first laser device scanning molding, by second laser to printable layer
It carries out micro-structure and subtracts material processing, it is no longer necessary to secondary grinding process be carried out to the oral devices of 3D printing, a printing shaping is beaten
It is high to print precision, and the fully controllable micro-structure of scale topography can be done, implantation is secured, long lifespan, good biocompatibility.
Further, the 3D printing device of oral devices provided by the utility model can also obtain oral cavity device by camera
The surface topography of part, the surface profile for processing the oral devices to be formed to continuous laser increasing material by pulse laser carry out accurate add
Work, meanwhile, it can intuitively observe the second laser and material processing is subtracted to the forming surface progress micro-structure, form institute
The microcellular structure needed.In this way, the Precision Machining by printing face profile, it is no longer necessary to be ground again to oral devices
Mill.
Further, the 3D printing device of oral devices provided by the utility model can pass through heat treatment mechanism pair again
Oral devices in printing are heat-treated, and oral devices laser sintered part and the un-sintered portion of laser in printing can be reduced
The temperature divided leads to stress existing for 3D printing workpiece there are difference so that the oral devices printed have preferably microcosmic
Tissue, by being directly heat-treated to oral devices after 3D printing so that the oral devices that a 3D printing molds are constant
Shape can meet the high-precision size requirement of oral cavity part.
Description of the drawings
Fig. 1 is a kind of structure chart of the 3D printing device for oral devices that the utility model first embodiment provides.
Fig. 2 is a kind of structure chart of the 3D printing device for oral devices that the utility model second embodiment provides.
Fig. 3 is a kind of structure chart of the 3D printing device for oral devices that the utility model third embodiment provides.
Fig. 4 is a kind of structure chart of the 3D printing device for oral devices that the 4th embodiment of the utility model provides.
Sectional structure chart in Fig. 5 Fig. 4 at A-A.
Fig. 6 is a kind of knot of the moulding cylinder of the 3D printing device for oral devices that the 4th embodiment of the utility model provides
Composition.
Main element symbol description
3D printing device 1000
Shaping work room 1
Laser light incident window 10
Camera 11
Forming worktable 2
Moulding cylinder 21
Moulding cylinder base station 210
Moulding cylinder elevating lever 212
Workbench 22
Power spreading device 3
Powdering cylinder 31
Powdering cylinder base station 310
Powdering cylinder elevating lever 312
Powdering part 32
Gas control system 4
Gas supply device 40
Vacuum extractor 41
Gas circulation purifier 42
Gas heat-exchanger 43
Heat exchange grid 431
Cooling water temperature plate 432
First laser device 5
Continuous laser seed source 51
Pulse laser seeds source 52
Fiber coupler 53
Fiber amplifier 54
First scanning galvanometer 55
Radiation source 6
Water-cooling channel 61
Temperature sensor 62
Heater 63
Thermal insulation board 64
Water cooling protection board 65
Gas jetting hole 66
Second laser 8
Laser generator 81
Focus lamp 82
Second scanning galvanometer 83
Lateral displacement mechanism 84
Length travel mechanism 85
Laser control module 9
Following specific implementation mode will further illustrate the utility model in conjunction with above-mentioned attached drawing.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
It should be noted that when component is referred to as " being fixed on " another component, it can be directly on another component
Or there may also be components placed in the middle.When a component is considered as " connection " another component, it can be directly connected to
To another component or it may be simultaneously present component placed in the middle.When a component is considered as " being set to " another component, it
Can be set up directly on another component or may be simultaneously present component placed in the middle.Term as used herein is " vertical
", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
System embodiment discussed below is only schematical, the division of the module or circuit, only one
Kind division of logic function, formula that in actual implementation, there may be another division manner.Furthermore, it is to be understood that one word of " comprising " is not excluded for other lists
Member or step, odd number are not excluded for plural number.The multiple units or device stated in system claims can also be by the same units
Or device is realized by software or hardware.The first, the second equal words are used to indicate names, and are not offered as any specific
Sequentially.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with the technology for belonging to the utility model
The normally understood meaning of technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein includes
Any and all combinations of one or more relevant Listed Items.
Refering to Figure 1, the 3D printing device 1000 of the oral devices for the utility model embodiment.The 3D printing
Device 1000 includes shaping work room 1, forming worktable 2, power spreading device 3, gas control system 4, first laser module,
Dual-laser module and laser control module 9.Wherein, the oral devices described in present embodiment include but not limited to dental implant,
Base station, corona, holder (removable denture) etc..
The shaping work room 1 is close encapsulation chamber, and interior is the inert gas of vacuum or full predetermined concentration.It is preferred that
Ground, the oxygen content ＜ 100ppm in the shaping work room 1, to avoid the oxidative damage to metal powder or oral devices.Institute
It is substantially square to state shaping work room 1, it is to be understood that the shape of the shaping work room 1 can also be any other suitable
Suitable shape, such as circle etc..
The forming worktable 2 is set in the shaping work room 1, the forming worktable 2 include moulding cylinder 21 and
The workbench 22 being arranged on the moulding cylinder 21.The moulding cylinder 21 is used for perpendicular to the direction of the workbench 22
The workbench 22 is pushed, so that multilayer print structure can be formed.The workbench 22 is generally horizontally disposed.The molding
Cylinder 21 includes moulding cylinder base station 210 and the molding being arranged between the moulding cylinder base station 210 and the workbench 22 lifting
Bar 212.In some embodiments, the moulding cylinder base station 210 can be rectangular or round stainless steel plate, the moulding cylinder elevating lever
212 can be piston.The moulding cylinder base station 210 can be approximately perpendicular to described in the driving lower edge of the moulding cylinder elevating lever 212
It moves in the direction of workbench 22.
Powder of the power spreading device 3 for being laid with predetermined thickness on the workbench 22.Implementation shown in Fig. 1
In example, the power spreading device 3 is arranged in the shaping work room 1, including powdering cylinder 31 and powdering part 32.The powdering cylinder 31
For the powder to be pushed to the position substantially concordant with the workbench 22, the powdering part 32 is used for the powder
It is laid with to the workbench 22, in some embodiments, the powdering part 32 can be scraper or powder-laying roller.It is appreciated that
It is that the powdering cylinder 31 can also be not arranged in position shown in figure, as long as the powder can be pushed to and the workbench
22 substantially parallel positions.For example, the powdering cylinder 31 can be arranged on the side or top of the shaping work room 1,
The powder is correspondingly delivered to the position substantially parallel with the workbench 22 from the side of the shaping work room 1 or top
It sets, then the powder is equably laid with to the workbench 22 by the powdering part 32.The position of the powdering part 32
It installs on the platform substantially parallel with the workbench 22, position is corresponding with the position of powdering cylinder 31, the powdering
The powder delivery outlet of cylinder 31 is placed exactly near the powdering part 32, in order to which the powdering part 32 will be exported from the powder
The powder of mouth output is laid with to the workbench 22.31 structure of powdering cylinder can be similar to the moulding cylinder 21, including paving
Powder cylinder base station 310 and powdering cylinder elevating lever 312 in described 310 one end of powdering cylinder base station is set, the powder is set to described
Side of the powdering cylinder base station 310 far from the moulding cylinder base station 210.The powdering cylinder base station 310 can be in the powdering cylinder liter
The driving lower edge of drop bar 312 is approximately perpendicular to the direction movement of the workbench, defeated from the powder to push the powder
Outlet output.In some embodiments, the powdering cylinder base station 310 can be rectangular or round stainless steel plate, the powdering cylinder liter
It can be piston to drop bar 312.
It is understood that the moulding cylinder 21 and the powdering cylinder 31 can be connected with a control system, with basis
Printing needs to accurately control the height of the workbench 22 and the thickness of the powder.
The gas control system 4 is used to control the gas in the shaping work room 1.The gas control system 4 wraps
Include gas supply device 40, vacuum extractor 41 and gas circulation purifier 42.The gas supply device 40 is used for institute
It states in shaping work room 1 and is filled with inert gas.The vacuum extractor 41 to the shaping work room 1 for carrying out vacuumizing place
Reason.The gas circulation purifier 42 is used to carry out circularly purifying to the gas in the shaping work room 1.The utility model
3D printing device 1000 be to be carried out in closed argon atmosphere, by the gas circulation purifier 42, can make
Control for Oxygen Content in the shaping work room 1 is in 100ppm or less.
The first laser module includes first laser device 5 and the first scanning galvanometer 55.The first laser device 5 can be
Optical fiber laser, including continuous laser seed source 51, pulse laser seeds source 52, fiber coupler 53 and fiber amplifier 54.
Wherein the continuous laser seed source 51 is connected with the fiber coupler 53 with the pulse laser seeds source 52, is used for
The laser sent out to the continuous laser seed source 51 and the pulse laser seeds source 52 is optically coupled.The fiber amplifier
The laser that device 54 is used to export the fiber coupler 53 is amplified processing, meets swashing for predefined parameter condition with output
Light.The wavelength for the continuous laser that wherein first laser device 5 exports can be 1.01 μm, 1.02 μm, 1.03 μm, 1.04 μm,
1.05 μm, 1.06 μm, 1.01 μm -1.08 μm or any other suitable wavelength；Power can be 40W-50W, 40W-60W, 40W-
70W, 40W-80W, 40W-90W, 40W-100W, 40W-450W, 450W-2000W, 40W-2000W etc. or any other are suitable
Power；Spot diameter can be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 60 μm -70 μm, 50 μm -100 μm, 50 μm of -200 μ
Value suitable m or any other.The pulse width for the pulse laser that the first laser device 5 exports is 200ps-1ps, pulse peak
It is worth power and is greater than or equal to 100KW, spot size can be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 60 μm -70 μm, 50 μ
m-100μm.In some embodiments, beam diameter adjuster can be added in the light path of the first laser device 5, for defeated
The spot size of the laser gone out is adjusted, so that the spot size of output is more in line with expection.First scanning galvanometer
55, for the laser reflection that the first laser device 5 exports to be focused on the workbench 22, scan by described first
The scanning of galvanometer 55 so that the laser that the first laser device 5 exports is incident upon with predefined paths on the workbench 22, from
And preset pattern is printed on the powder bed of the workbench 22.In the present embodiment, first scanning galvanometer 55
Sweep speed be 0~10000mm/s, such as 200mm/s, 300mm/s, 400mm/s, 500mm/s, 600mm/s, 700mm/s,
800mm/s, 900mm/s, 1000mm/s, 2000mm/s, 3000mm/s, 4000mm/s, 5000mm/s, it is to be understood that institute
The sweep speed for stating the first scanning galvanometer 55 is also not necessarily limited to the range, can also be any other suitable value, described
The sweep speed of first scanning galvanometer 55 can be appropriately arranged with according to printing specific requirements.First scanning galvanometer 55 is swept
It is 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm or 40 μm -70 μm or any other suitable spacing to retouch spacing
The sweep span of value, first scanning galvanometer 55 can be appropriately arranged with according to printing specific requirements.
The first laser device 5 and first scanning galvanometer 55 are arranged in the top of the shaping work room 1, described
Correspond on shaping work room 1 at the scanning range of first scanning galvanometer 55 and is provided with laser light incident window 10, the laser
It can be covered by transparent material at entrance window 10, such as transparent glass etc..
The second laser module includes second laser 8 and mobile mechanism.The second laser 8 passes through along mutually vertical
Straight both direction mobile device is set to the top of the forming worktable 2.The mobile mechanism includes being mounted on molding work
Make the lateral displacement mechanism 84 in room 1 and length travel mechanism 85, wherein lateral displacement mechanism 84 and length travel mechanism 85 are excellent
Choosing is mutually perpendicular to so that second laser 8 can move in the horizontal plane.In present embodiment, the lateral displacement mechanism
84 and length travel mechanism 85 for driving 8 transverse shifting of second laser and longitudinal movement, those skilled in the art that can adopt
Above-mentioned function, such as guide rail slide block structure are realized with various ways, ball screw arrangement etc., the utility model does not limit this
System.The second laser 8 be picosecond or femto-second laser, including laser generator 81, focus lamp 82 and second scanning
Galvanometer 83.Laser generator 81 generate laser successively line focus mirror 82 focus after, by the second scanning galvanometer 83 focus after
Laser reflection focuses on workbench, passes through the scanning of second scanning galvanometer 83 so that the laser after focusing is with predetermined
Path is incident upon on the workbench 22, to be swept to the forming worktable 2 for being laid with powder in the first laser device 5
Molding is retouched, after forming the printable layer of oral devices, the first laser device exports the pulse laser and carried out to the printable layer
Precision Machining.Then, the second laser 8 subtracts material processing to the printable layer progress micro-structure of the oral devices, forms tool
There is the cell structure in preset hole shape and aperture.In second laser 8 subtracts material process to oral devices progress micro-structure,
The hole shape of the cell structure and aperture are controllable, and those skilled in the art can arbitrarily be arranged the hole shape of preprocessing and have
The aperture of default size.In present embodiment, the focal range of the second laser 8 is 5~100mm, and spot diameter can be 8
It μm -10 μm, 8 μm -20 μm, 8 μm -30 μm, 8 μm -40 μm, 10 μm -20 μm, 10 μm -30 μm, 10 μm -40 μm, can be processed as several
Micron~tens microns of micro-structure.
The laser control module 9 is connect with the first laser module and second laser module respectively, for controlling
First laser module and second laser module are stated, so that the first laser device 5 exports the laser for meeting predefined parameter to institute
It states oral devices to carry out after increasing material processing, controls the second laser 8 and material processing is subtracted to oral devices progress micro-structure.
The method and step that 3D printing is carried out using the 3D printing device 1000 of the oral devices of the utility model is as follows：
First, 3 d part is carried out two-dimensional discrete, forms the piece number of plies by the 3D models for establishing entity oral devices to be generated
According to, according to the generated molding laser beam scan path of lamella data schema, the laser beam scan path include the number of plies, every layer
Thickness, every layer of cross section layered data and each layer scan path.
Then, then the shaping work room 1 is passed through into the gas by 41 vacuumize process of the vacuum extractor
Feeding mechanism 40 is filled with the inert gas of predetermined concentration, so that the oxygen content in the shaping work room 1 is less than 100ppm.
Then, the powder of predetermined thickness is laid on the workbench 22 using the power spreading device 3, the powder
Thickness can be 20 μm -30 μm, 20 μm -40 μm, 20 μm -50 μm, 20 μm -60 μm, 20 μm -70 μm, 20 μm -80 μm or any other
Suitable thickness.It is understood that the thickness of the powder can be specifically arranged according to described every layer of thickness.
Followed by, control the first laser device 5 output continuous laser (1.06 μ of wavelength for meeting subscription parameters condition
M, power 40W-2000W, 30 μm -200 μm of spot diameter), first scanning galvanometer 55 is with preset running parameter (scanning speed
Spend 200-5000mm/s, 40 μm -70 μm of sweep span) laser scanning is reflexed into the workbench 22, according to predetermined
Print routine, complete the printing of one layer of cross section of threedimensional model of oral devices, form printable layer.
Then, it then controls the first laser device 5 and exports and meet the picosecond pulsed laser of predefined parameter condition (pulse is wide
200ps-0.4ps, 30 μm -100 μm of spot size are spent, pulse peak power is greater than or equal to 100KW), first scanning is shaken
The pulse laser is projected to the workbench 22 by mirror 55 with preset print routine, completes the wheel of generated printable layer
The super micro-processing at wide edge improves the precision of contour edge.
Then, micro-structure processing is carried out to the printable layer of oral devices by second laser 8, subtracts material processing to reach
Purpose forms the cell structure with preset hole shape and aperture.The focal length of second laser 8 can be 5~100mm, counterpart
The printable layer of chamber device carries out subtracting material processing, realizes the regulation and control for increasing the oral devices micro-structure after material printing to 3D, improves 3D
The performance of the oral devices of printing.
Finally, after completing a printable layer super micro-processing, work of the workbench 22 in the moulding cylinder elevating lever 212
With a thickness of thin layer is declined, the printing of next layer of threedimensional model cross section is then carried out, is repeated the above steps until generating
Entity workpiece.The thickness of each layer of printable layer of the threedimensional model can be 20 μm -30 μm, 20 μm -40 μm, 20 μm -50 μm,
20 μm -60 μm, 20 μm -70 μm, 20 μm -80 μm or any other suitable thickness.
In some embodiments, the Method of printing further includes：In above-mentioned print procedure, institute is detected every predetermined period
The oxygen content in shaping work room 1 is stated, topping up is low to control oxygen content when oxygen content meets or exceeds preset value
In the preset value (such as 100ppm).
In some embodiments, the Method of printing further includes：In above-mentioned print procedure, institute is utilized every predetermined period
It states gas circulation purifier 42 and circularly purifying processing is carried out to the gas in the shaping work room 1.
It is understood that in the embodiment of above-mentioned Method of printing, being each printable layer will first be beaten using continuous laser
Print, then carries out Precision Machining with pulse laser.In other embodiments, can also be that two or more printable layers are respectively adopted
Continuous laser prints, and is then finished again to the molded profile including multiple cross section using pulse laser.By
Each printable layer can be carried out in second laser 8 to subtract material processing, in next layer of print procedure, first laser device 5
It does again and increases material processing, thus can easily process the micro-structure of various inside, be more bonded the feature of human oral cavity.
The 3D printing device 1000 and its Method of printing of the utility model carry out SLM using continuous laser and successively print, profit
Precision Machining is carried out to molding thin layer profile with pulse laser.It (is smaller than since the beam spot of picosecond pulsed laser is small
10 μm) smooth (Ra of processing scarfing＜1.0 μm), printing precision can be greatly improved, the application range of increasing material manufacturing is expanded.In addition, adopting
The surface accurate degree of printing oral devices can be increased substantially to 0.005mm with the 3D printing method of the utility model.And it beats
Simple system is printed, reliability is high, and stability is good, and molding printing and Precision Machining are completed in two beam laser mixed sweeps.
Moreover, the 3D printing device and Method of printing of the oral devices that present embodiment provides, can also swash by first
After the scanning molding of light device 5 forms the printable layer of oral devices, printable layer is carried out by second laser to subtract material processing, is no longer needed
The oral devices of 3D printing are carried out with secondary grinding process, a printing shaping, precision is high, and it is complete to do scale topography
Complete controllable micro-structure, implantation is secured, long lifespan, good biocompatibility.
Fig. 2 is a kind of structure chart of the 3D printing device for oral devices that the utility model second embodiment provides.Institute
The main distinction of the second embodiment and first embodiment stated is that second embodiment further includes a camera 11.It needs
It is noted that in the range of the spirit or essential attributes of the utility model, it is each specific suitable for first embodiment
Scheme can also be accordingly suitable for second embodiment, for the sake of saving space and avoiding repetition, and details are not described herein again.
As shown in Fig. 2, the 3D printing device 1000 is equipped with camera 11 in shaping work room 1.The camera 11 can be with
It is high-definition camera or high speed scanner, the surface topography for capturing oral devices.In first laser device by continuously swashing
Light scans molding to the powder being laid on forming worktable 2, completes one layer of pulse increased after material is processed by first laser device 5
Laser carries out laser precision machining to the face profile of oral devices.In present embodiment, pulse laser can be set and added every time
The elimination amount of work, by repeatedly processing to realize accurate processing.Further, described second is obtained by the camera 11
Laser carries out the surface topography of printing surface micro-structure processing.When surface micro-fabrication, the focal length of pulse laser is 5~100mm, is gathered
Burnt hot spot is 30-100 micron diameters, can be varied as desired in spot diameter.
In the method for carrying out 3D printing using the 3D printing device 1000 of present embodiment, the first laser is controlled
Device 5 sends out pulse laser to include the step of carrying out Precision Machining to oral devices：
When molding plane by continuous laser scanning, the surface of the plane is obtained by the camera 11
Pattern, while the pulse laser can also be obtained by the camera 11, essence is carried out to the face profile of the oral devices
The surface topography of close processing, and obtain the table that second laser 8 carries out the printable layer of the oral devices micro-structure processing
Face pattern.
Other steps are identical as the progress of 3D printing device 1000 method of 3D printing provided using first embodiment, this
Place repeats no more.
Fig. 3 is a kind of structure chart of the 3D printing device for oral devices that the utility model third embodiment provides.Institute
The main distinction of the third embodiment and first embodiment stated is that second embodiment further includes heat treatment mechanism device.
It should be noted that in the range of the spirit or essential attributes of the utility model, each tool suitable for first embodiment
Body scheme can also be just no longer superfluous herein accordingly suitable for third embodiment, for the sake of saving space and avoiding repetition
It states.
As shown in figure 3, the 3D printing device 1000 further includes heat treatment mechanism, the heat treatment mechanism be used for it is described at
Type operating room 1 carries out the pre-heat treatment.The temperature of laser sintered part and the un-sintered part of laser exists centainly when due to printing
Difference, carries out leading to 3D printing workpiece that there are certain stress, and the interior microscopic tissue of the printing workpiece printed does not reach
To most perfect or have certain defect, therefore, for the stress for reducing above-mentioned, and obtain more preferably microstructure product, it can be achieved that
Entire shaping work room 1 is heat-treated in 3D printing, especially carries out the pre-heat treatment.Heat treatment mechanism can be a variety of sides
Formula is realized, is two kinds of possible realization methods as follows：
1) heat treatment mechanism includes the heating element being arranged on the forming worktable 2, for being carried out to powder
Preheating preheats powder or is heated by being set to base station, the heating element on substrate.
2) heat treatment mechanism includes the radiation source 6 being arranged in the shaping work room 1, for swashing to described first
The running orbit of the hot spot for the continuous laser that light device 5 is sent out is heated.Radiation source 6 be range-controllable light source, such as it is infrared,
Semiconductor laser etc. heats subregion (size of its radiation areas can be adjusted by control irradiation hot spot)
Or preheating, fast heating and cooling can also be done, for example, when passing through radiation mode, laser is transported when increasing material printing by analysis
Capable track, controllable infrared wait are preheated on running orbit, are melted admittedly, ageing treatment.
The method and step that 3D printing is carried out using the 3D printing device 1000 of present embodiment is as follows：
Continuous laser is sent out to the powder being laid on the forming worktable 2 controlling the first laser device 5
Before the step of scanning molding, further include：Process at hot reason is carried out to the shaping work room 1, the heat treatment procedure includes：
The powder is heated by heating element, and/or,
By the way that the continuous laser sent out to the first laser device 5 in the indoor radiation source 6 of the shaping work is arranged
The running orbit of hot spot is heated.
Other steps are identical as the 3D printing method that first embodiment provides, and details are not described herein again.
Technology of the 3D printing device that present embodiment provides in addition to the 3D printing device provided with second embodiment
Outside effect, also oral devices are heat-treated by heat treatment mechanism, it is laser sintered in printing that oral devices can be reduced
The temperature of part and the un-sintered part of laser leads to stress existing for 3D printing workpiece there are difference so that the workpiece printed
With better microstructure.
Fig. 4 is a kind of structure chart of the 3D printing device for oral devices that the 4th embodiment of the utility model provides.Institute
The main distinction of the 4th embodiment and first embodiment stated is that the 4th embodiment further includes temperature-adjusting device.
It should be noted that in the range of the spirit or essential attributes of the utility model, each tool suitable for first embodiment
Body scheme can also be just no longer superfluous herein accordingly suitable for the 4th embodiment, for the sake of saving space and avoiding repetition
It states.
As shown in figure 4, due to 1 temperature of shaping work room it is excessively high in the case of be likely to result in the damage of 3D printing device 1000
Harmful, in present embodiment, which further includes temperature control equipment, and the temperature control equipment includes cooler
Structure, thermal insulation board 64, heater 63 and temperature sensor 62.Wherein, the cooling body includes air cooling mechanism and magnetism servo-electric motor water-cooling,
The air cooling mechanism includes the gas heat-exchanger 43 and gas jetting hole being arranged on the pipeline of gas circulation purifier 42
66, cooled down to the gas of suction by heat exchanger, later again sprays the gas after cooling through the gas jetting hole 66
Enter to realize the purpose of cooling.Fig. 5 is the sectional structure chart at A-A in Fig. 4.As shown in figure 5, the gas heat-exchanger 43 includes
One heat exchange grid 431 and cooling water temperature plate 432.The heat exchange grid 431 is that the metals such as copper, aluminium make, and the heat is handed over
It changes grid 431 to be connected to the gas heat-exchanger 43, and the heat exchange grid 431 has several fumaroles, the heat
To exchange the fumarole of grid 431 can quickly open and rapid cleaning, and flue dust is carried with what release export from shaping work room 1
Gas.The cooling water temperature plate 432 is set to the lower section of the heat exchange grid 431, and with the heat exchange grid 431
Contact.The cooling water temperature plate 432 have cooling water inlet and cooling water outlet, cooling water from the cooling water inlet into
Enter, flowed out from the cooling water outlet, to take away the heat of the heat exchange grid 431, helps the drop rapidly of heat exchange grid 431
The temperature of the low heat exchange grid 431.
The magnetism servo-electric motor water-cooling includes interconnected cooling duct 61, and the water-cooling channel 61 has water cooling entrance and water cooling
Outlet, the water cooling entrance and water cooling outlet are separately connected a water-filled radiator, and the coolant liquid of water cooling outlet outflow is through institute
After stating water-filled radiator cooling, enter the water-cooling channel 61 through the water cooling entrance, coolant liquid is in the water-cooling channel 61
After absorbing heat, the water-filled radiator is again flowed into through water cooling outlet.
The temperature control equipment can be arranged at shaping work room 1 and moulding cylinder 21.Temperature control is described below in detail
Set-up mode of the device processed in the shaping work room 1.
In present embodiment, the cooling duct of the magnetism servo-electric motor water-cooling can be set in the side wall of the shaping work room 1,
The coolant liquid of water cooling outlet outflow enters the water-cooling channel after water-filled radiator cooling, through the water cooling entrance
61, after coolant liquid absorbs the heat that the shaping work room 1 is conducted in the water-cooling channel 61, again through water cooling outlet
The water-filled radiator is flowed into, so as to radiate for shaping work room 1.
The air cooling mechanism is equipped with several gas jetting holes 66 in shaping work room 1, will through the gas jetting hole 66
Gas after cooling, which sprays into, realizes cooling in shaping work room 1.It is swept first in addition, the gas jetting hole 66 can also be arranged
It retouches and one or more gas jetting holes 66 is respectively set at galvanometer 55, be used for first scanning galvanometer, 55 spray cooling gas
Body helps the cooling of the first scanning galvanometer 55.One or more gas jetting holes 66 can also be set at the second scanning galvanometer 83,
For to second scanning galvanometer, 83 spray cooling gas, helping the cooling of the second scanning galvanometer 83.At laser light incident wound window
One or more gas jetting hole 66 can also be set,.For to 10 spray cooling gas of laser light incident window, laser being helped to enter
Penetrate the cooling of window 10.However, those skilled in the art can also be arranged as required to the gas injection of different location and injection direction
Hole 66 is cooled down with being realized to specific parts.
Accurately to control (such as being controlled accordingly according to specific temperature curve) into trip temperature, the temperature
Sensor 62 can be one or more, be set to the inner wall of the shaping work room 1, for the shaping work room 1
Interior temperature is detected to adjust the heating power of the heating element or the radiation source 6.
The setting of the thermal insulation board 64 is in 1 side wall of shaping work room, for preventing external heat to be passed to shaping work room 1
It is interior, it is also possible to which the temperature scald operating personnel for preventing shaping work room 1 excessively high, improves the safety of operating personnel.
Be described below in detail temperature control equipment the moulding cylinder 21 set-up mode.
Fig. 6 is a kind of moulding cylinder 21 of the 3D printing device for oral devices that the 4th embodiment of the utility model provides
Structure chart.As shown in fig. 6, the water-cooling channel 61 can be set to the moulding cylinder 21 side wall in, for moulding cylinder 21 into
Row heat dissipation.The coolant liquid of water cooling outlet outflow is after water-filled radiator cooling, described in water cooling entrance entrance
Water-cooling channel 61 goes out after coolant liquid absorbs the heat that the moulding cylinder 21 conducts in the water-cooling channel 61 through the water cooling
Mouth again flows into the water-filled radiator, so as to be that moulding cylinder 21 radiates.
Accurately to control (such as being controlled accordingly according to specific temperature curve) into trip temperature, the temperature
Sensor 62 can be arranged the bottom of the moulding cylinder base station 210 in the moulding cylinder 21, and quantity can be one or more
It is a, the temperature for detecting the moulding cylinder base station 210, to adjust the temperature of moulding cylinder base station 210 in real time.The heater 63
It is set to the lower section of the moulding cylinder base station 210, for being heated to the moulding cylinder base station 210.The setting of the thermal insulation board 64 exists
The lower section of the moulding cylinder base station 210, and 64 edge of the thermal insulation board is connect with the moulding cylinder base station 210, thus with institute
It states moulding cylinder base station 210 and forms a confined space, the heater 63 is located in the confined space.The lower section of the thermal insulation board 64
It is additionally provided with a water cooling protection board 65, is equipped with several water-cooling channels 61 in the water cooling protection board 65, in the water cooling protection board 65
Water-cooling channel 61 be connected to the water-cooling channel 61 in 1 side wall of shaping work room, for radiating to moulding cylinder 21.
Technology of the 3D printing device that present embodiment provides in addition to the 3D printing device provided with the 4th embodiment
Outside effect, also the temperature of shaping work room 1 and moulding cylinder 21 is adjusted and is controlled by thermoregulation mechanism, it can be to avoid
To reduce, temperature is excessively high to damage printing equipment.
In addition, for those of ordinary skill in the art, it can be made with technical concept according to the present utility model
Its various corresponding change and deformation, and all these changes and deformation should all belong to the protection model of the utility model claims
It encloses.
Claims (10)
1. a kind of 3D printing device of oral devices, which is characterized in that the 3D printing device of the oral devices includes：
Forming worktable is arranged in shaping work room；
Power spreading device, for being laid with powder in the forming worktable；
First laser module, including first laser device and the first scanning galvanometer, the first laser device include the company set gradually
Continuous laser seed source and pulse laser seeds source, fiber coupler and fiber amplifier, the continuous laser seed source and pulse
The light beam of laser seed source output exports continuous laser or pulse laser after fiber coupler and fiber amplifier；Described
One scanning galvanometer is for focusing on continuous laser or pulse laser that the first laser device exports by the first scanning galvanometer
The powder being laid on the forming worktable；
Second laser module, including second laser and mobile mechanism, the mobile mechanism are set to the forming worktable
Top, the second laser are connected to the mobile mechanism, and the mobile mechanism drives the second laser in a level
In face transversely or longitudinal movement；
Laser control module is connect with the first laser module and second laser module respectively, is swashed for controlling described first
Light device exports the printing that continuous laser forms the powder scanning molding being laid on the forming worktable oral devices
Layer, and control the first laser device and export after the pulse laser carries out Precision Machining to the printable layer, described second
Laser carries out micro-structure to the printable layer of the oral devices and subtracts material processing, forms the porous knot with preset hole shape and aperture
Structure body.
2. 3D printing device as described in claim 1, which is characterized in that further include camera,
When molding plane by continuous laser scanning, the surface topography of the plane is obtained by the camera,
And it obtains the pulse laser and the face profile of the oral devices is processed with the second laser to the mouth
The printable layer of chamber device carries out micro-structure and subtracts the surface state after material processing.
3. 3D printing device as described in claim 1, which is characterized in that the second laser is along orthogonal two sides
To the top for being movably set to the forming worktable.
4. 3D printing device as claimed in claim 3, which is characterized in that the second laser be picosecond or femtosecond laser
Device, and the focal range of the second laser is 5~100mm.
5. 3D printing device as described in claim 1, which is characterized in that further include heat treatment mechanism, the heat treatment mechanism
For carrying out the pre-heat treatment to the shaping work room.
6. 3D printing device as claimed in claim 5, which is characterized in that the heat treatment mechanism includes being arranged in the molding
Heating element on workbench, for being preheated to powder.
7. 3D printing device as claimed in claim 6, which is characterized in that the heat treatment mechanism includes being arranged in the molding
Work indoor radiation source, and the running orbit of the hot spot of the continuous laser for being sent out to the first laser device heats.
8. 3D printing device as claimed in claim 7, which is characterized in that further include temperature control equipment, the temperature control
Device includes cooling body, thermal insulation board, heater and temperature sensor, and the cooling body includes air cooling mechanism and water cooling unit
Structure, the air cooling mechanism include the gas heat-exchanger being arranged on the pipeline of gas circulation purifier and are sprayed with the gas
Perforation, the gas jetting hole are used for at least one of first scanning galvanometer, the second scanning galvanometer and laser light incident window
Carry out injection gas cooling；The magnetism servo-electric motor water-cooling includes interconnected cooling duct, and the water-cooling channel has water cooling entrance
It is exported with water cooling, and the water-cooling channel is set to the bottom surface of the side wall and moulding cylinder of the shaping work room.
9. 3D printing device as claimed in claim 8, which is characterized in that the thermal insulation board is set to the side of the shaping work room
The lower section of wall and the moulding cylinder base station, and the edge of the thermal insulation board is connect with the moulding cylinder base station, and it is close to form one
Space is closed, the heater is set in the confined space.
10. 3D printing device as claimed in claim 9, which is characterized in that the temperature sensor is set to the shaping work
The surface of the direction of the inner wall of room and the forming worktable heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928094.4U CN207823960U (en) | 2017-12-29 | 2017-12-29 | The 3D printing device of oral devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928094.4U CN207823960U (en) | 2017-12-29 | 2017-12-29 | The 3D printing device of oral devices |
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| Publication Number | Publication Date |
|---|---|
| CN207823960U true CN207823960U (en) | 2018-09-07 |
Family
ID=63391330
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721928094.4U Ceased CN207823960U (en) | 2017-12-29 | 2017-12-29 | The 3D printing device of oral devices |
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| CN (1) | CN207823960U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015280A (en) * | 2017-12-29 | 2018-05-11 | 广东汉邦激光科技有限公司 | The 3D printing device and Method of printing of oral devices |
| CN110508813A (en) * | 2019-09-19 | 2019-11-29 | 深圳大指科技有限公司 | A method of it improving selective laser and melts product's dimensional precision |
| CN110666166A (en) * | 2019-08-22 | 2020-01-10 | 广东技术师范大学 | Multi-laser high-precision 3D printer and printing method thereof |
-
2017
- 2017-12-29 CN CN201721928094.4U patent/CN207823960U/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015280A (en) * | 2017-12-29 | 2018-05-11 | 广东汉邦激光科技有限公司 | The 3D printing device and Method of printing of oral devices |
| CN110666166A (en) * | 2019-08-22 | 2020-01-10 | 广东技术师范大学 | Multi-laser high-precision 3D printer and printing method thereof |
| CN110666166B (en) * | 2019-08-22 | 2022-02-08 | 广东技术师范大学 | Multi-laser high-precision 3D printer and printing method thereof |
| CN110508813A (en) * | 2019-09-19 | 2019-11-29 | 深圳大指科技有限公司 | A method of it improving selective laser and melts product's dimensional precision |
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