CN112571798A - Quick ultra-high temperature heating device of 3D printing powder bed - Google Patents
Quick ultra-high temperature heating device of 3D printing powder bed Download PDFInfo
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- CN112571798A CN112571798A CN202011544352.5A CN202011544352A CN112571798A CN 112571798 A CN112571798 A CN 112571798A CN 202011544352 A CN202011544352 A CN 202011544352A CN 112571798 A CN112571798 A CN 112571798A
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- layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/295—Heating elements
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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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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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 belongs to the technical field of 3D printing and discloses a rapid ultrahigh-temperature heating device for a 3D printing powder bed. The device comprises a step plate, a quick heating plate and a replacement plate, wherein the step plate is used as a base plate in the 3D printing device, the quick heating plate is used for quickly heating, the replacement plate is used as a forming table top, and the replacement plate made of different materials is selected according to different materials to be printed and formed; the fast hot board includes the heat transfer layer, generates heat the layer, conductive electrode and insulating layer, and the heat transfer layer sets up in the top on the layer that generates heat, and with the contact of replacement board for the heat conduction on the layer that will generate heat gives the replacement base plate, and the layer material that generates heat is graphite, realizes rapid heating up in the short time, and the insulating layer will generate heat the layer and separate with the ladder board, avoids heat conduction to the ladder board, and then the loss is to forming in the jar. By the invention, heat is prevented from being transferred to the forming cylinder, and the forming cylinder is protected; can be used for forming high-entropy alloy or nanocrystalline alloy, and reduces the thermal stress and anisotropy of the material by rapid temperature rise.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a rapid ultrahigh-temperature heating device for a 3D printing powder bed.
Background
With the continuous progress of science and technology, industrial parts are gradually developed towards the direction of precision and complexity, and the traditional processing means such as casting, forging and pressing cannot meet the current manufacturing requirements, so that the 3D printing technology is produced, the 3D printing is based on a digital model file, a mode of using adhesive materials such as powdered metal, ceramic and plastic to form a component problem in a layer-by-layer heating and solidifying mode is one of the main means of additive manufacturing, and based on the processing characteristics, the 3D printing technology can produce parts with high precision and complex shapes.
However, the conventional 3D printing has a slow substrate heating rate, and the heat is easily diffused into the forming cylinder to damage the cylinder, so the substrate preheating temperature cannot be too high, the substrate temperature is generally about 200 ℃ in the 3D printing process, and high-entropy alloys and nanocrystal alloys with excellent performance cannot be produced, and so far, the 3D printing equipment cannot solve the above defects. Meanwhile, the low temperature of the substrate at 200 ℃ can also cause high-speed cooling of a molten pool, a large temperature gradient exists, large thermal stress exists after the internal molten pool is solidified, the mechanical property of the material is seriously influenced, even cracks are generated, moreover, a large amount of dendritic crystals are generated, and the anisotropy of a formed part is improved.
In order to solve the above drawbacks, it is necessary to provide a device that can produce high-entropy alloy or nanocrystalline alloy in 3D printing process and reduce the thermal stress and anisotropy of the material.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides the rapid ultrahigh-temperature heating device for the 3D printing powder bed, and through the design of the key component rapid heating plate, on one hand, the heating device can be ensured to rapidly heat up to 2000 ℃ in 20s, and on the other hand, the heat is prevented from being transferred to the forming cylinder through the replacement plate, so that the temperature of the forming cylinder is always kept at a lower level, and the forming cylinder is protected; in addition, the heating device can be used for forming high-entropy alloy or nanocrystalline alloy, and the thermal stress and the anisotropy of the material are reduced through rapid temperature rise.
To achieve the above object, according to one aspect of the present invention, there is provided a rapid ultra-high temperature heating apparatus for a 3D printing powder bed, the apparatus including a step plate, and a rapid heating plate and a substitution plate provided in the step plate, wherein:
the step plate is used as a base plate in the 3D printing device, the quick heating plate is arranged in the step plate and used for quickly heating, the replacing plate is arranged above the quick heating plate and used as a forming table board, and replacing plates of different materials are selected according to different materials to be printed and formed;
the fast hot board includes the heat transfer layer, generates heat the layer, conductive electrode and insulating layer, the heat transfer layer sets up generate heat the top on layer, with the replacement board contact, be used for with the heat conduction on layer that generates heat gives the replacement base plate, the layer material that generates heat is graphite, conductive electrode and this generate heat the layer and be connected, through being connected the circular telegram back with external power, realize rapid heating up in the short time, the insulating layer sets up the below on layer that generates heat will generate heat the layer and the ladder board separately, avoid heat conduction extremely the ladder board, and then the loss is to in the shaping jar.
Further preferably, the heat insulation layer comprises a ceramic heat insulation layer and a foam heat insulation layer, and inert gas layers are arranged between the ceramic heat insulation layer and the heating layer and between the ceramic heat insulation layer and the foam heat insulation layer, so that heat insulation is realized to the greatest extent.
Further preferably, a through hole is formed in the step plate, and a lead connected with the conductive electrode passes through the through hole and is connected with the conductive electrode.
Further preferably, the wire is divided into two parts, the front half part is arranged in the through hole, the rear half part penetrates out of the through hole and is connected with an external power supply, and a heat insulation sleeve is arranged on the outer surface of the wire of the two parts, so that heat of the heating layer is prevented from being conducted out.
Further preferably, the material adopted by the heat transfer layer is silicon carbide or boron nitride.
Further preferably, two sides of the replacement plate are provided with double-lug structures, so that the replacement plate can be conveniently taken out of the step plate.
Further preferably, the contact position of the quick heating plate and the step plate is provided with a heat insulating material, so that heat of the quick heating plate is prevented from being conducted to the step plate.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the heating layer is made of graphite, can be quickly heated up to 2000 ℃ within 20s after being electrified, and can realize quick heating, compared with the existing forming substrate, the characteristic of quick heating can reduce the thermal stress and anisotropy when forming high-entropy alloy and nanocrystalline alloy, and avoid generating cracks;
2. the heat transfer layer is made of a material which can quickly transfer heat to the replacement plate to avoid waste of heat, and the material of the heat transfer layer can resist high temperature to avoid deformation at overhigh temperature;
3. the heat insulation layer adopted in the invention is internally provided with inert gas, a ceramic heat insulation layer and a foam heat insulation layer, wherein the inert gas is derived from protective gas in the 3D printing process, so that the heating effect is prevented from being lost due to oxidation failure of 3D printing metal and oxidation failure of a graphite layer, and the heat insulation effect is prevented from being reduced due to direct contact of a heating layer and the ceramic heat insulation layer; the ceramic heat insulation layer is a wire which prevents heat of the heating layer from being directly transferred to the lower part of the ceramic heat insulation layer to cause high-temperature melting of the wire; when the device works, the temperature of the electrode layer is increased, the foam heat insulation layer can prevent heat from dissipating onto the lifting platform, and the heat sensitive device is arranged near the lifting platform, so that the situation that the 3D printing equipment is damaged and the tightness of the 3D printing equipment is reduced due to the fact that the heat sensitive device is damaged can be avoided, and further the 3D printing equipment is damaged;
4. the replacement plate provided by the invention is used as a formed table top, different replacement plates can be replaced according to formed materials, and the replacement plate is simple in structure, easy to detach and relatively simple in operation process, so that compared with the conventional heating device which is replaced according to different conditions, the replacement plate is simple and low in cost.
Drawings
FIG. 1 is a schematic structural view of a heating apparatus constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a stepped plate of a heating apparatus constructed in accordance with a preferred embodiment of the present invention;
fig. 3 is a structural schematic of a fast-heating plate of a heating apparatus constructed in accordance with a preferred embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the heat-insulation plate comprises a step plate 1, a quick heating plate 2, a replacement plate 3, a bolt connecting hole 4, a through hole 5, a heat-transfer layer 6, a heating layer 7, a conductive electrode 8, an inert gas layer 9, a ceramic heat-insulation layer 10, a foam heat-insulation layer 11, a lead 12, a first groove 13 and a second groove 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The utility model provides a quick ultra-high temperature heating device of 3D printing powder bed, includes step plate 1, fast hot plate 2, replacement board 3. The quick heating plate 2 is placed inside the step plate 1, and the replacement plate 3 is placed above the quick heating plate 2 and is mechanically packaged into a whole through bolts. A quick ultra-high temperature heating device that powder bed 3D printed replaces traditional heating base plate to be connected with the elevating platform through being connected with the elevating platform, can preheat the powder bed rapidly to 2000 ℃ in 20s, reduces the heat loss simultaneously and to the shaping jar in, the protection shaping cylinder body.
Wherein, the step plate 1 is the echelonment, is provided with first recess, second recess, 6 bolted connection holes 4 and 2 cylindrical through-holes 5 therein.
2 bolted connection holes are located 1 base of ladder board, 2 bolted connection holes are located first recess 13, and 2 bolted connection holes are located 1 boss of ladder board. The bolt connecting holes 4 in the step plate base and the step plate boss can fix the step plate on the lifting platform, and the bolt connecting holes in the first grooves 13 can fix the replacement plate 3 on the step plate 1.
2 cylindrical through-hole initial position is located the nearer side of one deck ladder face in the second recess, and final position is located one deck ladder side, and cylindrical through-hole can realize that the circular telegram wire goes out this heating device, provides the electric energy.
Thermal insulation materials are covered on the inner wall of the second groove of the stepped plate 1, so that heat of the quick heating plate can be reduced to be dissipated to other parts of the stepped plate, heat dissipation is caused, the heating effect of the replacement plate is reduced, and meanwhile, thermal deformation of the stepped plate cannot be caused.
The fast heating plate 2 consists of a heat transfer layer 6, a heating layer 7, a heat insulation layer and a conductive electrode 8, is connected through the cylindrical conductive electrode and is placed in the second groove 14 of the step plate 1.
The heating layer 7 is connected with a lead 12 of pure copper, and the lead 12 of pure copper is led out from the cylindrical through hole 5.
The periphery of the pure copper wire is subjected to heat insulation treatment, and glass fiber weaving and mica lapping are adopted and then are subjected to glass fiber weaving.
The replacement plate 3 is prepared using a material that is 3D printed powder-uniform.
The peripheral outline of the replacement plate 3 is the same as that of the first groove 13, double lug-shaped protrusions exist, the thickness of the replacement plate is consistent with the depth of the first groove, 2 bolt connecting holes are formed, the diameters of the bolt connecting holes are consistent with those of bolt holes of the first groove, and the replacement plate 3 and the stepped plate 1 can be fixedly connected through bolts.
The heating device provided by the invention can produce high-entropy alloy or nanocrystalline alloy in 3D printing equipment, reduce the thermal stress and anisotropy of the material, simultaneously reduce the heat dissipated into the forming cylinder, ensure that the temperature of the forming cylinder is kept at a lower level in the high-temperature 3D printing process, and protect the forming cylinder.
A quick ultra-high temperature heating device that powder bed 3D printed replaces traditional heating base plate and is connected with the elevating platform through being connected with the elevating platform, can preheat the powder bed to 2000 ℃ rapidly in 20 s.
In the embodiment of the invention, the stepped plate is made of 304 stainless steel, so that the manufacturing cost based on 304 stainless steel is low, and the basic printing requirement is met; the size of the base of the step plate 1 is 123mm multiplied by 10mm, and the radius of the fillet of the four edges is 23 mm. The size of the upper-layer boss 190 part of the stepped plate is 123mm multiplied by 98mm multiplied by 30mm, and the radius of the fillet of the four edges is 23 mm. The existence of the ladder of ladder board 1 makes to have most space on the ladder board, makes power supply wire surplus part save in the space when placing a quick ultra-temperature heating device that powder bed 3D printed at the elevating platform, and when the elevating platform descends, the extension of power supply wire surplus part can not cause the lift in-process wire to tear apart, causes to print the termination and causes the personal danger even.
In the embodiment of the invention, the thickness of the first groove 13 of the step plate 1 is 5mm, the lug-shaped protruding structure is observed from the upper surface of the lug boss, the lug-shaped protruding structure is embodied as a cubic plate which is arranged at the central part and has the size of 60mm multiplied by 30mm multiplied by 5mm and two cubic plates with the size of 14mm multiplied by 5mm, the cubic plates are 'Boolean' and integrated into an irregular shape, and then a fillet with the radius of 5mm is arranged at the protruding part.
In the embodiment of the invention, the second groove of the substrate is in a cubic shape with dimensions of 54mm multiplied by 24mm multiplied by 20 mm.
In the embodiment of the invention, the distance between two bolt connecting holes on the step plate 1 is 90mm, and the distance between 2 bolt connecting holes on the boss of the step plate 1 is 90 mm. The distance between the 2 bolt connecting holes positioned inside the first groove 13 is 70 mm.
In the specific application, the starting positions of the 2 cylindrical through holes 5 are positioned on the side surface, which is closer to the step surface, of the second groove 14, and the ending positions are positioned on the side surface of the step.
In the embodiment of the present invention, the diameter of the 2 cylindrical through holes 5 is 8 mm.
In a specific application, the inner wall of the second groove 14 of the step plate 1 is covered with a heat insulating material.
In the embodiment of the invention, the inner wall of the second groove 14 of the step plate 1 is covered with asbestos, and the asbestos is abutted against the second groove 14 and the side surface of the quick-heating plate 2 in the adding process.
In the embodiment of the invention, the quick heating plate is in a cubic shape and has the overall size of 50mm multiplied by 20mm multiplied by 18mm, wherein the size of the heat transfer layer 6 is 50mm multiplied by 20mm multiplied by 2mm, the size of the heating layer 7 is prepared by graphite and is 50mm multiplied by 20mm multiplied by 2mm, the size of the upper electrode layer connected with the conductive electrode is 10mm multiplied by 20mm multiplied by 3mm, the size of the lower electrode layer is 10mm multiplied by 20mm multiplied by 2mm, and the size of the ceramic heat insulation layer 10 is 10mm multiplied by 20mm multiplied by 8 mm. The foam heat insulation layer 11 is 50mm multiplied by 20mm multiplied by 2mm in size, and the heat transfer layer 6, the heating layer 7, the electrode layer and the heat insulation layer are connected through a cylindrical conductive electrode 8 with the radius of 2.5mm to be combined into a whole.
The front half part of the lead 12 is connected with the conductive electrode 8, the periphery of the rear half part is subjected to heat insulation treatment, glass fiber weaving and mica lapping are adopted, then glass fiber weaving is carried out, and meanwhile, the pure copper lead adopts a 6-square specification.
The replacement plate 3 can be made of titanium alloy, aluminum alloy, stainless steel, ceramic and the like, and is selected according to the printed sample powder, so that the convenience in changing the printing material is realized.
In a specific application, the peripheral profile of the replacement plate is the same as that of the first groove 13, and a double-lug structure is present, which is embodied by a cubic plate with the size of 56mm × 24mm × 5mm placed in the center and two cubic plates with the size of 12mm × 12mm × 5mm and integrated with irregular shapes, the thickness of the plate is consistent with the depth of the first groove 13, and then a fillet with the radius of 4mm is arranged at the protruding part. The replacing plate 3 is not only as high as the first groove in the height direction, but also as small as the first groove in the length and width directions, so that the replacing plate is convenient to replace, and meanwhile, the top of the boss of the assembled stepped plate 1 is consistent with the top horizontal line of the replacing plate, so that the printing effect is not affected.
The replacement plate 3 and the step plate 1 may be fixed by bolting.
In the embodiment of the invention, the replacement plate 3 has two lug structures in the width direction on the basis of the cubic shape, the lug structure 280 is obtained by designing a fillet structure with the radius of 5mm from a 14mm multiplied by 10mm cubic plate, the replacement plate is integrally obtained through Boolean union operation, and the lug structure is designed to reduce the size of the replacement plate and reduce heat loss. The design position of the bolt through hole of the lug-shaped structure is consistent with the position of the first groove of the step plate, so that the mechanical packaging of the step plate and the replacement plate is realized.
In the embodiment of the invention, the energy is transmitted to the quick heating plate through the lead 12, the voltage is 220V, the current is 30A, and the quick heating plate is prompted to rapidly heat to 2000 ℃ within 20s, so that 3D printing of nanocrystalline and high-entropy alloy is realized, forming of ceramic materials is facilitated, the organization is prompted to be uniform, and the anisotropy of a formed piece is reduced.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a quick ultra-high temperature heating device of 3D printing powder bed which characterized in that, the device include ladder board (1) and set up fast hot board (2) and replacement board (3) in this ladder board, wherein:
the step plate (1) is used as a base plate in the 3D printing device, the quick heating plate (2) is arranged in the step plate and used for quick heating, the replacing plate (3) is arranged above the quick heating plate (2) and used as a forming table board, and replacing plates of different materials are selected according to different materials to be printed and formed;
fast hot plate (2) are including heat transfer layer (6), generate heat layer (7), conductive electrode (8) and insulating layer, heat transfer layer (6) set up generate heat the top on layer, with the replacement board contact, be used for with the heat conduction on layer that generates heat gives the replacement board, layer (7) material that generates heat is graphite, conductive electrode (8) are connected with this layer that generates heat, through being connected the circular telegram back with external power, realize rapid heating up in the short time, the insulating layer sets up the below on layer that generates heat will generate heat the layer and separate with the ladder board, avoid heat conduction extremely the ladder board, and then the loss is to forming in the jar.
2. The rapid ultra-high temperature heating device for 3D printing powder bed according to claim 1, characterized in that the thermal insulation layer comprises a ceramic thermal insulation layer (10) and a foam thermal insulation layer (11), and inert gas layers are respectively arranged between the ceramic thermal insulation layer (10) and the heat generating layer (7) and between the ceramic thermal insulation layer and the foam thermal insulation layer (11), so that thermal insulation is realized to the maximum extent.
3. The rapid ultra-high temperature heating device for 3D printing powder bed as claimed in claim 1, wherein the step plate (1) is provided with a through hole (5), and the conducting wire connected with the conducting electrode is connected with the conducting electrode through the through hole.
4. The rapid ultra-high temperature heating device for 3D printing powder bed according to claim 3, characterized in that the conducting wire (12) is divided into two parts, the first half part is arranged in the through hole, the second half part is extended out of the through hole and connected with an external power supply, and the outer surface of the conducting wire of the two parts is provided with a heat insulation sleeve to avoid conducting the heat of the heating layer out.
5. The rapid ultra-high temperature heating device for 3D printing powder bed according to claim 1, characterized in that the material of the heat transfer layer (6) is silicon carbide or boron nitride.
6. The rapid ultra-high temperature heating device for 3D printing powder bed as claimed in claim 1, characterized in that two sides of the replacement plate (3) are provided with a double-lug structure to facilitate the replacement plate to be taken out from the step plate.
7. The rapid ultra-high temperature heating device for 3D printing powder bed according to claim 1, characterized in that the contact part of the rapid heating plate (2) and the step plate (1) is provided with a heat insulating material to avoid the heat of the rapid heating plate from being conducted to the step plate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011544352.5A CN112571798B (en) | 2020-12-24 | 2020-12-24 | Quick ultra-high temperature heating device of 3D printing powder bed |
| PCT/CN2021/072846 WO2022134250A1 (en) | 2020-12-24 | 2021-01-20 | Rapid ultra-high temperature heating device of 3d printing powder bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011544352.5A CN112571798B (en) | 2020-12-24 | 2020-12-24 | Quick ultra-high temperature heating device of 3D printing powder bed |
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| Publication Number | Publication Date |
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| CN112571798A true CN112571798A (en) | 2021-03-30 |
| CN112571798B CN112571798B (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011544352.5A Active CN112571798B (en) | 2020-12-24 | 2020-12-24 | Quick ultra-high temperature heating device of 3D printing powder bed |
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| Country | Link |
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| CN (1) | CN112571798B (en) |
| WO (1) | WO2022134250A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112571798B (en) | 2022-05-17 |
| WO2022134250A1 (en) | 2022-06-30 |
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