CN104785780B - A kind of device and method for improving selective laser sintering 3D printing part strength - Google Patents
A kind of device and method for improving selective laser sintering 3D printing part strength Download PDFInfo
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- CN104785780B CN104785780B CN201510219968.8A CN201510219968A CN104785780B CN 104785780 B CN104785780 B CN 104785780B CN 201510219968 A CN201510219968 A CN 201510219968A CN 104785780 B CN104785780 B CN 104785780B
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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 discloses a kind of device and method for improving selective laser sintering 3D printing part strength, device mainly includes laser cell, powdering unit, compressing unit and powder heating unit, one piece and the piston-shaped identical quartz glass panel of moulding cylinder are placed in parallel directly over shaping piston, quartz glass panel is realized with ball-screw by stepper motor and moved up and down, glass panel moves up certain distance after the completion of every layer of sintering, can pass through powdering roller, carry out powdering process next time, can not only laser be passed through with optical quartz glass panel but also can apply thrust powder compaction, it can avoid making the inside after sintering process hole influence product strength occur because there is stomata in powder, and improve products surface quality.The top surface of moulded products does not occur be bonded with quartz glass plate contact.Can also powdering be sintered rear quartz glass panel and suppress to moulded products surface cooled and solidified, then take out moulded products after removing quartz glass panel.
Description
Technical field
The present invention relates to the mechanism in a kind of rapid forming equipment, more particularly, to a kind of SLS selective laser sinterings 3D
Mechanism and method in printing device.
Background technology
Rapid shaping technique (also known as RP technique, Rapid Prototyping Manufacturing,
Abbreviation RPM), also referred to as 3D printing.The technology is according to the three-dimensional modeling data of object, by former to be successively superimposed
Mode manufactures entity, and it can overcome the special construction obstacle that current tradition machinery processing can not be realized.It can realize arbitrarily complicated
The simplification production of structure member.Existing 3D printing technique is broadly divided into, and fused glass pellet (FDM), selective laser burn
Tie (SLS), stereolithography (SLA), digital light processing (DLP).
For selective laser sintering (SLS), existing apparatus is achieved in that substantially：Selectively it is layered using laser
Sintering solid powder, and its whole technical process of the cured layer required part of shape of superposition generation of sinter molding is included CAD
The foundation and data processing of model, powdering, sintering and post processing etc..Whole process unit is made up of powder cylinder and moulding cylinder,
Powder cylinder piston (powder feeding piston) rises during work, is uniformly spread powder on moulding cylinder piston (working piston) by powder-laying roller
One layer.Computer controls the two-dimensional scan track of laser beam according to the hierarchical model of prototype, selectively sintering solid powder material
Expect to form an aspect of part.Sintering is completed after one layer, and working piston declines a thickness, and powdering system is spread newly again
Powder.Control laser beam scans the new layer of sintering again, so moves in circles, is layering, until 3 d part shaping.Finally, will not
The Powder Recovery of sintering takes out molding part into powder cylinder.
At present, the dusty material of Selective Laser Sintering is loose, and surface is still after laser sintered
Granular, and it is interior containing irregular hole, cause finished surface coarse, intensity is not enough, it is difficult to meet industrial requirements.So
Need a kind of device for improving selective laser sintering 3D printing part strength and surface quality.
The content of the invention
The present invention is directed to disadvantages mentioned above, designs a kind of device and compresses every layer of powder, eliminate the stomata in powder, makes in selection
Property it is laser sintered during adhesion is stronger between powder, improve forming part bulk strength, make selective laser sintering part
Intensity and surface quality meet industrial requirements.
The technical scheme is that：A kind of device for improving selective laser sintering 3D printing part strength, main bag
Laser cell, powdering unit, compressing unit and powder heating unit are included, laser cell mainly includes CO2Generating laser and sweep
Retouch galvanometer；Powdering unit mainly includes powder, moulding cylinder, moulding cylinder piston, powder cylinder, powder cylinder piston, powdering roller, shaping
Cylinder stepper motor and powder cylinder stepper motor, moulding cylinder are placed adjacent parallel with powder cylinder；Compressing unit includes control optics stone
Compression stepper motor, leading screw and the optical quartz glass panel of English glass panel movement；Powder-laying roller is placed on moulding cylinder and powder
Above cylinder, powder-laying roller scrapes powdering above moulding cylinder above powder cylinder, powder-laying roller one layer of powdering in moulding cylinder every time
Thickness, optical quartz glass plate is located above moulding cylinder piston, the sectional dimension of optical quartz glass plate and cutting for moulding cylinder piston
Face size is identical；Powder heating unit mainly includes resistance heater and thermocouple；Laser cell mainly includes CO2Laser emission
Device and scanning galvanometer are located above optical quartz glass plate.
A kind of device for improving selective laser sintering 3D printing part strength of the present invention, by microcomputer to printing
Model is cut into slices, plans laser sintered path, and CO is controlled by computer program2Generating laser switchs turn with scanning galvanometer
It is dynamic, laser beam is sintered on powder surface according to microcomputer path planning, and generating laser is closed after this layer terminates,
Generating laser is opened when next layer of sintering starts.
A kind of device for improving selective laser sintering 3D printing part strength of the present invention, before every layer prints, moulding cylinder
Piston declines the height of a thickness, and powder cylinder piston rises the height of a thickness, and powdering roller is from powder cylinder to moulding cylinder
It is mobile, uniformly it is paved with one layer of powder in moulding cylinder piston face.
A kind of device for improving selective laser sintering 3D printing part strength of the present invention, it is parallel directly over shaping piston
One piece and the piston-shaped identical quartz glass panel of moulding cylinder are placed, quartz glass panel is electric up and down through stepping is compressed
Machine is realized with ball-screw.After powdering process terminates, glass panel is moved down, and makes to stop after powder bed deformation is a certain amount of
Only, laser starts selective sintering process, due to CO2The laser that laser is sent is ultraviolet laser, and optical quartz glass is
Best ultraviolet laser light transmissive material, so optical quartz glass panel does not interfere with laser sintered process.After the completion of sintering
Glass panel moves up certain distance, can pass through powdering roller, carries out powdering process next time.
The present invention it is a kind of improve selective laser sintering 3D printing part strength device heating unit, including resistance plus
Hot device and thermocouple.Under resistive heater heats powder temperature to fusing point, thermocouple keeps powder temperature constant.
It is using a kind of manufacturing process for the device for improving selective laser sintering 3D printing part strength of the present invention：First
Step, powdering is added in powder cylinder, is opened under resistive heater heats dusty material temperature to fusing point, is protected by thermocouple
Hold powder temperature constant in setting value, moulding cylinder piston is moved up and quartz glass plate contact；Second step, adjusts moulding cylinder piston
Decline a thickness, glass panel moves up certain distance, passes through powdering roller, above and below quartz glass panel
It is moved through compressing stepper motor and ball-screw realization；3rd step, powder cylinder rise a thickness height, powdering roller from
Powder cylinder is moved to moulding cylinder, and one layer of powder is uniformly paved with moulding cylinder piston face；4th step, glass panel is moved down,
Stop after making powder bed deformation a certain amount of；5th step, CO2Generating laser starts selective sintering process, CO2Laser emission
Device sends ultraviolet laser beam, and laser beam is scanned through vibration mirror reflected and is radiated at through quartz glass panel on moulding cylinder piston
The rotational angle of powder bed surface scan galvanometer is by computer control, and three-dimensional modeling data is cut into slices by computer, path planning,
Then laser is made to be radiated at powder surface, every layer of sintering knot according to computer institute path planning by controlling the rotation of scanning galvanometer
Generating laser is closed after beam, generating laser is opened when next layer of sintering starts；Above-mentioned second step is repeated to the 5th step, directly
Completed to last layer of powdering on moulding cylinder piston face, quartz glass panel lifts a small distance after powdering is compacted,
Laser beam sintering is carried out again, and so far moulded products complete.In last layer of powdering sintering, because quartz glass panel does not have
Have and contacted with powdering, the top surface of moulded products will not be due to occurring be bonded with quartz glass plate contact.Last
The process of layer powdering can also repeat second step to the 5th step, and powdering is sintered rear quartz glass panel and suppressed to moulded products table
Face cooled and solidified, then moulded products are taken out after removing quartz glass panel.
The present invention not only through laser but also can apply thrust powder compaction with optical quartz glass panel, can be with
Avoid making the inside after sintering process hole influence product strength occur because there is stomata in powder, and improve product surface matter
Amount.
Brief description of the drawings
Fig. 1 is a kind of operating diagram for the device for improving selective laser sintering 3D printing part strength of the present invention.
In figure：1-CO2Generating laser；2- scanning galvanometers；The compression stepper motor of 3- control optical quartz glass movements
And leading screw；4- optical quartz glass panels；5- powder；6- moulded products；7- moulding cylinder pistons；8- powder cylinder pistons；9- powderings
Roller；10- resistance heaters and thermocouple.
Embodiment
The invention provides a kind of device for improving selective laser sintering 3D printing part strength, as shown in figure 1, by swashing
Laser cell, powdering unit, compressing unit and powder heating unit composition；Laser cell mainly includes CO2The He of generating laser 1
Scanning galvanometer 2；Powdering unit mainly includes powder 5, moulding cylinder piston 7, powder cylinder piston 8 and powdering roller 9；Compressing unit bag
Include the compression stepper motor (being not drawn into figure) and leading screw 3, optical quartz glass panel of control optical quartz glass panel movement
4；Heating unit includes resistance heater and thermocouple 10.
In a kind of device for improving selective laser sintering 3D printing part strength of the present invention, CO2Generating laser 1 is sent
Ultraviolet laser beam, laser beam is scanned through the powder layer surface that galvanometer 2 is reflexed on moulding cylinder piston 7；Scanning mirror shake 2 turn
Dynamic to be controlled by computer, three-dimensional modeling data is cut into slices by computer, path planning, then by controlling turning for scanning galvanometer 2
It is dynamic laser beam is radiated at the surface of powder 5 according to computer institute path planning；Powder cylinder piston 8 rises the height of a thickness,
Powdering roller 9 is moved from powder cylinder to moulding cylinder, and one layer of powder 5 is uniformly paved with the surface of moulding cylinder piston 7；In moulding cylinder piston
One piece of optical quartz glass panel 4 is placed in parallel directly over 7, optical quartz glass panel 4 is electric up and down through stepping is compressed
Machine is realized with leading screw 3.After powdering process terminates, optical quartz glass panel 4 is moved down, make powder bed deformation it is a certain amount of it
After stop, optical quartz glass panel 4 moves up certain distance after the completion of laser starts selective sintering process, sintering, makes
Powdering roller 9 can be passed through, and carry out powdering process next time；Under temperature to the fusing point of 10 heating powder of resistance heater 5,
Thermocouple 10 keeps the temperature of powder 5 constant.
In a kind of device for improving selective laser sintering 3D printing part strength of the present invention, optical quartz glass panel 4
That plane contacted with molded product 6 does release treatment, sticks antiadhesion barrier, or carries out the processing of the anti-stick coatings such as coating, or
Spray antitack agent.Can also be after the sintering of powder 5, CO2Generating laser 1 is stopped intervals, makes the table of sintering
There is certain cooling in face, then removes optical quartz glass panel 4.
Claims (6)
1. a kind of device for improving selective laser sintering 3D printing part strength, it is characterised in that：Mainly include laser cell,
Powdering unit, compressing unit and powder heating unit, laser cell mainly include CO2Generating laser and scanning galvanometer；Powdering
Unit mainly includes powder, moulding cylinder, moulding cylinder piston, powder cylinder, powder cylinder piston, powdering roller, moulding cylinder stepper motor
With powder cylinder stepper motor, moulding cylinder is placed adjacent parallel with powder cylinder；Compressing unit includes control optical quartz glass panel
Mobile compression stepper motor, leading screw and optical quartz glass panel；Powder-laying roller is placed on moulding cylinder and powder cylinder top, powdering
Roller scrapes powdering above moulding cylinder above the powder cylinder, powder-laying roller one thickness of powdering, optical quartz in moulding cylinder every time
Glass panel is located above moulding cylinder piston, the sectional dimension of optical quartz glass panel and the sectional dimension phase of moulding cylinder piston
Together；Powder heating unit mainly includes resistance heater and thermocouple；Laser cell mainly includes CO2Generating laser and scanning
Galvanometer is located above optical quartz glass panel.
2. the method for the device using a kind of raising selective laser sintering 3D printing part strength described in claim 1, its
It is characterised by：The first step, powdering is added in powder cylinder, open resistive heater heats dusty material temperature to fusing point it
Under, constant in setting value by thermocouple holding powder temperature, moulding cylinder piston is moved up and optical quartz glass plate contact；The
Two steps, adjustment moulding cylinder piston declines a thickness, and optical quartz glass panel moves up certain distance, makes the powdering roller can
To pass through, optical quartz glass panel is realized up and down through stepper motor and ball-screw；On 3rd step, powder cylinder
The height of a thickness is risen, powdering roller is moved from powder cylinder to moulding cylinder, and one layer of powder is uniformly paved with moulding cylinder piston face
End；4th step, optical quartz glass panel is moved down, and is stopped after making powder bed deformation a certain amount of；5th step, CO2Laser
Transmitter starts selective sintering process, CO2Generating laser sends ultraviolet laser beam, and laser beam is scanned through vibration mirror reflected
The rotational angle for the powder bed surface scan galvanometer being radiated at through optical quartz glass panel on moulding cylinder piston passes through computer
Control, three-dimensional modeling data is cut into slices by computer, path planning, then by control the rotation of scanning galvanometer make laser according to
Computer institute path planning is radiated at powder surface, every layer terminate after close generating laser, start in next layer of sintering
When open generating laser；Above-mentioned second step is repeated to the 5th step, until last layer of powdering is on moulding cylinder piston face upper berth
Good, optical quartz glass panel lifts a small distance after powdering is compacted, then carries out laser beam sintering, so far moulded products system
Complete.
3. a kind of raising selective laser sintering 3D printing part described in use claim 1 according to claim 2
The method of the device of intensity, it is characterised in that：That plane that optical quartz glass panel is contacted with moulded products does anti-sticking place
Reason.
4. a kind of raising selective laser sintering 3D printing part described in use claim 1 according to claim 2
The method of the device of intensity, it is characterised in that：That plane that optical quartz glass panel is contacted with moulded products is sticked anti-sticking
Film.
5. a kind of raising selective laser sintering 3D printing part described in use claim 1 according to claim 2
The method of the device of intensity, it is characterised in that：That plane that optical quartz glass panel is contacted with moulded products carries out anti-sticking
Coating treatment.
6. a kind of raising selective laser sintering 3D printing part described in use claim 1 according to claim 2
The method of the device of intensity, it is characterised in that：That plane spraying that optical quartz glass panel is contacted with moulded products is anti-sticking
Agent.
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| CN201510219968.8A CN104785780B (en) | 2015-04-30 | 2015-04-30 | A kind of device and method for improving selective laser sintering 3D printing part strength |
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Cited By (1)
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| EP3482866B1 (en) * | 2017-11-08 | 2022-11-23 | Commissariat À L'Énergie Atomique Et Aux Énergies Alternatives | Method using a laser for welding between two metallic materials or for sintering of powder(s), application to the production of bipolar plates for pemfc cells |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3482866B1 (en) * | 2017-11-08 | 2022-11-23 | Commissariat À L'Énergie Atomique Et Aux Énergies Alternatives | Method using a laser for welding between two metallic materials or for sintering of powder(s), application to the production of bipolar plates for pemfc cells |
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