CN114082991A - Assembled substrate for powder bed melting additive manufacturing and using method thereof - Google Patents
Assembled substrate for powder bed melting additive manufacturing and using method thereof Download PDFInfo
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- CN114082991A CN114082991A CN202111275961.XA CN202111275961A CN114082991A CN 114082991 A CN114082991 A CN 114082991A CN 202111275961 A CN202111275961 A CN 202111275961A CN 114082991 A CN114082991 A CN 114082991A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 73
- 239000000843 powder Substances 0.000 title claims abstract description 66
- 239000000654 additive Substances 0.000 title claims abstract description 58
- 230000000996 additive effect Effects 0.000 title claims abstract description 58
- 238000002844 melting Methods 0.000 title claims abstract description 50
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- 238000000034 method Methods 0.000 title claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/30—Platforms or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the field of metal powder bed melting additive manufacturing, in particular to an assembled substrate for powder bed melting additive manufacturing and a using method thereof. The fabricated substrate includes: the standard substrate is provided with at least one assembling groove, and the bottom of the assembling groove is provided with a through hole; and the small substrates are in one-to-one correspondence with the assembly grooves, the small substrates are embedded in the assembly grooves on the standard substrate, and the small substrates are detachably mounted on the standard substrate. The assembled base plate provided by the invention is convenient for taking down the product and the small base plate from the main base plate; after the primary printing is finished, the standard substrate does not need to be leveled, so that the production preparation time is greatly shortened, the production efficiency is improved, and the processing cost is reduced; after the products are formed and manufactured, the small formed substrates can be detached from the standard substrate, so that the products can be independently processed according to detection requirements, and the equipment utilization rate is improved.
Description
Technical Field
The invention relates to the field of metal powder bed melting additive manufacturing, in particular to an assembled substrate for powder bed melting additive manufacturing and a using method thereof.
Background
The metal powder bed melting has good development potential and market application prospect in metal additive manufacturing. The metal powder bed melting technology is mainly classified into a laser powder bed melting technology and an electron beam melting technology according to an energy beam used for processing. The processing process generally comprises the steps of spreading powder on a prefabricated substrate layer by layer, selecting an area needing to be scanned by high-energy beams on the current layer according to model slicing, obtaining a molded part in a circulating and reciprocating mode, and then cutting and separating the part from the substrate.
At present, the development of the metal powder bed melting technology is still incomplete, and a plurality of enterprises and researchers are continuously researching the optimal parameters of the powder bed melting technology. In the exploration process, the conventional substrate is often inconvenient to manufacture. Conventional baseplates are often used to make bulk parts with feature sizes above 5cm, while some additive manufacturing samples for testing purposes are smaller, with feature sizes below 1 cm. This makes the conventional substrate too large in size relative to the test sample, and also causes a waste of the substrate use area. Some samples for special experimental purposes, such as residual stress detection or deformation detection, should not be removed from the substrate before testing in order to avoid testing errors caused by cutting. But limited to the size of the test equipment, are too bulky or even impossible to perform if tested in conjunction with the substrate. Some parameter screening experiments require a special material substrate with high price to improve the bonding between the melting powder and the substrate. Such substrates, if processed using the dimensions of conventional substrates adapted to the printer, would incur significant material and processing costs. The cutting time of the sample also accounts for a large part of the proportion in the additive manufacturing process, and the high-precision processing of the substrate after cutting also needs to spend a plurality of days and thousands of yuan.
The invention CN111421138A discloses a base plate composed of hundreds of height-adjustable movable blocks, which purportedly can play a role in simplifying the printing support by adjusting the height of the movable blocks. However, most powder bed melting technologies in the market require a scraper or a powder spreading roller to level the powder bed, but the raised movable blocks can prevent the scraper from spreading powder, so that the powder bed cannot be formed. Inventions CN106312066B, CN108380876A each disclose a combined base plate comprising a main base plate and a shaped base plate. The main substrate is mounted on the forming apparatus as a support plate, and the forming substrate is detachably mounted on the main substrate for product forming manufacture. After the products are formed and manufactured, the forming substrates can be detached from the main substrate, so that the products can be separated, and the products can be independently processed according to requirements. However, such assembled substrates still have certain disadvantages, and before and after additive manufacturing, complicated assembly and disassembly are required, and this process may cause unacceptable errors in fine additive manufacturing. Especially, there is an assembly gap at the edge of the substrate, which may cause the substrate to be jammed during printing, so that the substrate cannot be lifted normally. The CN110216284B realizes detachable operation of the test block by adopting a mode that the special-shaped clamping groove is provided with the special-shaped sliding block, and the test block can be accurately positioned according to the positioning line on the substrate and can be fixed by inserting the fixed embedded block. However, the machining of the special-shaped groove and the special-shaped sliding block is generally difficult, and the positioning by distinguishing a plurality of grid lines can easily result in a plurality of wrong grid lines.
Disclosure of Invention
In order to solve the technical problem, the invention provides a fabricated substrate for powder bed melting additive manufacturing and a using method thereof. The assembled base plate provided by the invention is convenient for taking down the product and the small base plate from the main base plate; after the primary printing is finished, the standard substrate does not need to be leveled, so that the production preparation time is greatly shortened, the production efficiency is improved, and the processing cost is reduced; after the products are formed and manufactured, the small formed substrates can be detached from the standard substrate, so that the products can be independently processed according to detection requirements, and the equipment utilization rate is improved.
Specifically, the present invention provides a fabricated substrate for powder bed additive manufacturing, comprising:
the standard substrate is provided with at least one assembling groove, and the bottom of the assembling groove is provided with a through hole; and
and the small substrates are in one-to-one correspondence with the assembly grooves, embedded in the assembly grooves on the standard substrate and detachably mounted on the standard substrate.
The inventor finds that the invention replaces a large substrate which needs fine processing and is high in cost with a small substrate which is low in cost and can be subjected to batch turning and milling or wire cutting processing, so that the cost and the time required by the SLM process are greatly reduced, and the invention is suitable for mass production and processing. The invention also avoids complex assembly and avoids gaps left on the side edge of the standard substrate, thereby reducing assembly errors and achieving high assembly precision. The invention can reduce the cost and the production period, and can also avoid the influence factors of the conventional linear cutting for taking down the workpiece, and some experimental tests need to avoid the influence factors.
According to the assembled base plate for powder bed melting additive manufacturing provided by the invention, the hole is a through hole and/or a threaded hole.
According to the assembled base plate for powder bed melting additive manufacturing provided by the invention, the small base plate is in a cylindrical shape; preferably, the cross section of the small substrate is circular and/or rectangular with round corners.
According to the fabricated substrate for powder bed melting additive manufacturing provided by the invention, the small substrate is embedded into the standard substrate and then has prestress; and/or the small base plate and the assembling groove are in transition fit or interference fit.
According to the assembled base plate for powder bed melting additive manufacturing provided by the invention, the standard base plate is provided with a positioning line.
According to the fabricated substrate for powder bed melting additive manufacturing provided by the invention, the shape of the assembling groove is consistent with the shape of the corresponding small substrate; and/or the depth of the assembling groove is consistent with the thickness of the small substrate; preferably, the hole is located at the center of the assembly groove, the diameter of the hole is larger than that of the replacement rod used, and the hole is contained in the assembly groove.
According to the fabricated substrate for powder bed melting additive manufacturing provided by the invention, the standard substrate is made of carbon steel or aluminum alloy; and/or the small substrate is made of one or more materials selected from titanium alloy, steel, aluminum alloy, copper alloy, nickel-based alloy and refractory alloy (tungsten alloy, molybdenum alloy, tantalum alloy, niobium alloy and the like).
The invention also provides a using method of the assembled base plate for powder bed melting additive manufacturing, and the disassembling mode of the assembled base plate comprises the following steps: the diameter of the replacement rod is smaller than the diameter of the hole and the length of the replacement rod is greater than the depth of the hole by inserting the replacement rod into the hole and ejecting the small base plate from the assembly slot.
According to the use method of the assembled base plate for powder bed melting additive manufacturing, provided by the invention, when the hole is a through hole, the replacing rod body is an ejector pin; and/or when the hole is a threaded hole, the replacing rod body is a bolt matched with the threaded hole.
According to the use method of the assembled base plate for powder bed melting additive manufacturing provided by the invention, the assembling mode of the assembled base plate comprises the following steps: a gasket is padded on the small substrate, pressure is applied to the gasket, so that the small substrate enters the assembling groove, and the pressure is preferably applied in a hammering mode; or, the small substrate is first low-temperature treated in liquid nitrogen, and then the cooled small substrate is placed in the assembling tank.
The invention has the beneficial effects that: 1) the integrated block-shaped standard substrate is replaced by the assembly type substrate for powder bed melting additive manufacturing, the assembly type substrate on the base can be customized into different shape materials according to printing requirements, and batch customization processing is performed; 2) the operation is simple, the disassembly is convenient, and redundant fastening parts do not need to be installed. Through practical use, the mounting and dismounting of the one-wheel assembled substrate can be completed within only one minute according to the use instruction; 3) the manufacturing cost is reduced, because the standard substrate which plays the role of the base can be made of cheap process materials such as carbon steel or aluminum alloy and the like, the cost is low, and because the size of the small substrate in the inner part is small, the cost is low, the standard substrate can be produced in batch, and the processing price is low; 4) the assembly precision is high. The outer edge of the assembled substrate designed by the invention has no gap, so that the powder clamping phenomenon cannot occur, and the movement of the lifting table is not influenced; meanwhile, because complex fastening parts do not need to be installed, assembly errors caused by different fastening effects cannot be generated. After testing, after assembly is completed, the up-and-down fluctuation of the upper surfaces of the small substrate and the standard substrate is within 20 microns, and the flatness requirement of 3D printing is met. The design of the scribing lines ensures that the placing position of the substrate can be corrected through the scribing lines, and the actual placing position of the substrate is the same as the theoretical position.
Drawings
FIG. 1 is a schematic structural diagram of a fabricated substrate for powder bed additive manufacturing according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of a fabricated substrate for powder bed additive manufacturing in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line B-B of a fabricated substrate for powder bed additive manufacturing in accordance with an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of a fabricated substrate for powder bed additive manufacturing in accordance with an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of a fabricated substrate for powder bed additive manufacturing in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a small substrate of a fabricated substrate for powder bed additive manufacturing according to an embodiment of the present invention;
FIG. 7 is a data model of a fabricated substrate for powder bed additive manufacturing in an embodiment of the present invention;
fig. 8 shows an actual printing result of a fabricated substrate for powder bed additive manufacturing according to an embodiment of the present invention.
Wherein, 1: standard substrate, 2: fillet rectangular channel, 3: hole, 4: scribing line, 5: circular groove, 6: seal ring groove, 7: a small substrate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
The embodiment of the invention provides an assembled base plate for powder bed melting additive manufacturing, which comprises: the standard substrate is provided with at least one assembling groove, and the bottom of the assembling groove is provided with a through hole; and the small substrates are in one-to-one correspondence with the assembly grooves, the small substrates are embedded in the assembly grooves on the standard substrate, and the small substrates are detachably mounted on the standard substrate. The embodiment of the invention replaces a large substrate which needs fine processing and is high in cost with a small substrate which is low in cost and can be processed by batch turning and milling or linear cutting, so that the cost and the time required by the SLM process are greatly reduced, and the method is suitable for mass production and processing. The invention also avoids complex assembly and avoids gaps left on the side edge of the substrate, thereby reducing assembly errors and achieving high assembly precision. The invention can reduce the cost and the production period, and can also avoid the influence factors of the conventional linear cutting for taking down the workpiece, and some experimental tests need to avoid the influence factors.
According to the assembled base plate for powder bed melting additive manufacturing provided by the embodiment of the invention, the hole is a through hole and/or a threaded hole.
According to the assembled base plate for powder bed melting additive manufacturing provided by the embodiment of the invention, the small base plate is in a cylindrical shape; preferably, the cross section of the small substrate is circular and/or rectangular with round corners. In the embodiment of the invention, the small substrate is set into a cylinder, and the cross section of the main body is designed into a round rectangle or a circle, so that batch turning and milling and linear cutting are facilitated. The machining precision and the requirement meet the standard substrate machining precision of the adaptive 3D printer.
According to the assembled substrate for powder bed melting additive manufacturing provided by the embodiment of the invention, the small substrate is embedded into the standard substrate and then has prestress; and/or the small base plate and the assembling groove are in transition fit or interference fit. In the embodiment of the invention, the small substrate and the standard substrate are in interference fit in the assembly process, no redundant fasteners are needed, the cylindrical surface of the substrate is smooth and seamless, and high assembly precision can be achieved. The connection between the standard substrate and the small substrate is realized through transition or interference fit of the substrates without bolts. The small substrate and the standard substrate are detachably connected. The standardized small substrate has certain prestress after being embedded into the standard substrate, and is fastened together through the prestress, so that the fastening of connection is ensured. The design of the holes ensures that the movable substrate can still be removed after being firmly inserted into the standard substrate.
According to the assembled base plate for powder bed melting additive manufacturing provided by the embodiment of the invention, the standard base plate is provided with a positioning line; and/or a sealing ring groove is arranged at the bottom of the standard substrate. In the embodiment of the invention, the positioning line is a scribing line which is scribed on the standard substrate and used for positioning and correcting, so that the substrate designed by the invention can be conveniently installed on a 3D printer.
According to the fabricated substrate for powder bed melting additive manufacturing provided by the embodiment of the invention, the shape of the fabricated groove is consistent with the shape of the corresponding small substrate; and/or the depth of the assembling groove is consistent with the thickness of the small substrate; preferably, the hole is located at the center of the assembly groove, the diameter of the hole is larger than that of the replacement rod used, and the hole is contained in the assembly groove. In an embodiment of the present invention, the standard substrate is a standard substrate subjected to secondary processing, and is mounted on a forming apparatus as a supporting base, and a small substrate for product forming manufacturing is detachably mounted on the standard substrate subjected to secondary processing. Each fitting groove is the same in shape as the corresponding movable substrate (small substrate), and the depth of the fitting groove is the same as the thickness of the movable substrate. And the small substrates are embedded into the assembly grooves in each printing assembly.
According to the fabricated substrate for powder bed melting additive manufacturing provided by the embodiment of the invention, the standard substrate is made of carbon steel or aluminum alloy; and/or the small substrate is made of one or more materials selected from titanium alloy, steel, aluminum alloy, nickel-based alloy, copper alloy and refractory alloy (tungsten alloy, molybdenum alloy, tantalum alloy, niobium alloy and the like).
The embodiment of the invention also provides a using method of the assembled base plate for powder bed melting additive manufacturing, and the disassembling mode of the assembled base plate comprises the following steps: the diameter of the replacement rod is smaller than the diameter of the hole and the length of the replacement rod is greater than the depth of the hole by inserting the replacement rod into the hole and ejecting the small base plate from the assembly slot. In the embodiment of the invention, the fabricated substrate for powder bed melting additive manufacturing is convenient and accurate to assemble, simple to operate, accurate in printing positioning, low in manufacturing cost and suitable for experimental research and detection and cutting-free additive manufacturing product production. The invention cancels the bolt assembly process of the small substrate, can avoid the positioning error generated in the bolt assembly process, and is very important for material increase manufacturing and test analysis with higher precision.
According to the use method of the fabricated substrate for powder bed melting additive manufacturing provided by the embodiment of the invention, when the hole is a through hole, the replacing rod body is an ejector pin; and/or when the hole is a threaded hole, the replacing rod body is a bolt matched with the threaded hole.
According to the use method of the assembly type base plate for powder bed melting additive manufacturing provided by the embodiment of the invention, the mounting mode of the assembly type base plate comprises the following steps: the small substrate is subjected to low-temperature treatment in liquid nitrogen and then placed in the assembly groove. In the embodiment of the invention, the small substrate and the assembling groove on the standard substrate processed secondarily are in transition or interference fit, the small substrate is immersed in liquid nitrogen for a period of time before assembly, so that the small substrate is slightly shrunk, the small substrate is taken out and then is rapidly placed at the bottom of the large substrate, the volume of the small substrate slightly expands along with the temperature rise of the small substrate to room temperature, the small substrate is tightly matched with the large substrate, and tight assembly can be realized without bolts.
Example 1
The embodiment provides a fabricated substrate for powder bed melting additive manufacturing and a using method thereof. As shown in fig. 1, the fabricated substrate includes a standard substrate 1, a rounded rectangular groove 2, a through-hole 3-1 in the fabricated groove, a scribing line 4, and a circular groove 5. Six rounded rectangular grooves 2 for accommodating the rounded rectangular small substrates and a circular groove 5 for accommodating the circular small substrate 7 are arranged on the standard substrate 1, and a through hole 3-1 is arranged at the center position in each assembly groove. The cross section A-A of the standard substrate 1 is shown in FIG. 2. The cross-section B-B of the standard substrate 1 is shown in FIG. 3. The bottom of the standard substrate 1 is provided with a seal ring groove 6. The small substrate 7 in this embodiment has a rounded rectangular shape, as shown in fig. 6.
The basic model of the standard base plate 1 is referred to the drawing of the standard base plate of an EOS M100 printer, the diameter is 100mm, and the bottom of the standard base plate is provided with a seal ring groove 6 for positioning and fixing. The fillet rectangular groove 2 has a depth of 4mm, a rectangular shape of 30mm × 10mm, and a chamfer angle of 2.5 mm. The circular groove 5 has a depth of 8mm and is in the shape of a circle with a diameter of 25 mm. The diameter of the through hole at the center of each groove was 4 mm.
The method for reusing the fabricated substrate for powder bed melting additive manufacturing provided by the embodiment specifically includes: a standard substrate 1 is first placed on a flat, sturdy work platform. Then the small substrate 7 is aligned with the notch and placed on the groove, and at the moment, the small substrate is difficult to fall into the groove due to high processing precision. Then, a hard gasket with the size exceeding the area of the small substrate is taken to be padded on the small substrate 7, the gasket is hammered to enable the small substrate to completely slide into the assembling groove 2, and a flexibility meter is taken to detect whether the height difference between the small substrate 7 and the standard substrate 1 meets the requirement or not. After all the assembly grooves of the standard substrate 1 are filled, the standard substrate 1 is positioned and placed on the printing platform of the printer according to the seal ring groove 6. And finally, adjusting the printing position of the substrate according to the positioning line 4 on the standard substrate to ensure that the actual printing position is overlapped with the printing area set by the computer.
The 3D printing process may be completed in accordance with the standard operating sequence of the printer. After printing, the standard substrate 1 is taken out from the printer forming bin, vertically clamped on a fixing clamp, and the small substrate 7 containing the printed content is knocked out from the through hole 4 by taking the thimble. After all the small substrates 7 are removed, the standard substrate 1 is removed, and one printing process is completed. And continuously mounting the small substrates 7 to finish the next printing round or stopping printing, and carrying out batch processing on the printed parts on different small substrates 7. The data model in the example was printed as shown in fig. 7. The standard substrate 1, the small substrate 7 and the printed product thereof of the printing example are shown in fig. 8.
Example 2
The fabricated substrate for powder bed melting additive manufacturing provided in this embodiment is, as shown in fig. 4 to 5, the same as that of embodiment 1 except that the through holes are replaced with bolt holes. The basic model of the standard base plate 1 is referred to the drawing of the standard base plate of an EOS M100 printer, the diameter is 100mm, and the bottom of the standard base plate is provided with a seal ring groove 6 for positioning and fixing. The rounded rectangular groove 2 had a depth of 4mm and a rectangular chamfer of 30mm x 10mm in shape of 2.5 mm. The depth of the circular groove was 8mm, and the shape was a circle with a diameter of 25 mm. The center position of each slot opens a bolt hole of M6 or M8.
The method for reusing the fabricated substrate for powder bed melting additive manufacturing provided by the embodiment comprises the following steps: a standard substrate 1 is first placed on a flat, sturdy work platform. The small substrate 7 is aligned with the notch and placed on the groove, and at the moment, the small substrate 7 is difficult to fall into the groove due to high processing precision; then, a hard gasket with the size exceeding the area of the small substrate is taken to be padded on the small substrate 7, the gasket is hammered to enable the small substrate 7 to completely enter the assembly groove 2, and a flexibility meter is taken to detect whether the assembly precision of the small substrate 7 and the standard substrate 1 meets the requirement or not. After all the assembly grooves 2 of the standard substrate 1 are filled, the standard substrate 1 is positioned and placed on a printing platform of a printer according to the seal ring groove 6. And finally, adjusting the printing position of the substrate according to the positioning line 4 on the standard substrate 1 to ensure that the actual printing position is overlapped with the printing area set by the computer.
The 3D printing process may be completed in accordance with the standard operating sequence of the printer. After printing, the standard substrate 1 is taken out of the printer forming bin, vertically clamped on a fixing clamp, and a hand-held electric drill is screwed in a bolt from a bolt hole position to eject a small substrate 7 containing printing contents. After all the small substrates 7 are removed, the standard substrate 1 is removed, and one printing process is completed. The small substrate 7 can be mounted for the next printing run, or printing can be stopped and the printed parts on different small substrates 7 can be batched 8. In this embodiment, the small substrate 7 is ejected by screwing the bolts, so that the small substrate 7 can be taken out more safely than in embodiment 1.
Example 3
The fabricated substrate for powder bed melting additive manufacturing and the using method of the fabricated substrate for powder bed melting additive manufacturing in the embodiment 2 are adopted, and the differences are as follows: a standard substrate 1 is first placed on a flat, sturdy work platform. And (3) placing the small substrate 7 in liquid nitrogen, cooling and reducing the size of the small substrate, taking out the small substrate by using a clamp, quickly placing the small substrate into the assembly groove 2, and realizing interference fit when the temperature of the small substrate 7 is raised to the room temperature. And a flexibility meter is used for detecting whether the assembly precision of the small substrate 7 and the standard substrate 1 meets the requirement or not. After all the assembly grooves 2 of the standard substrate 1 are filled, the standard substrate 1 is positioned and placed on a printing platform of a printer according to the seal ring groove 6. And finally, adjusting the printing position of the substrate according to the positioning line 4 on the standard substrate to ensure that the actual printing position is overlapped with the printing area set by the computer. In the embodiment, the small substrate 7 is immersed in liquid nitrogen before assembly, so that the small substrate 7 is slightly shrunk, the small substrate 7 is taken out and then is rapidly placed into the assembly groove 2 of the standard substrate 1, and the volume slightly expands along with the temperature rise of the small substrate 7 to the room temperature 1, and the small substrate is tightly matched with the standard substrate and is tightly assembled without bolts. After printing, the bolts are screwed in through the threaded holes in the back of the standard substrate 1, the small substrate is ejected out, and disassembly is achieved. In the embodiment, the mode of assembling the small substrate is changed into the mode of soaking the small substrate by using liquid nitrogen, and the small substrate is reduced and then is plugged into the seal ring groove 6 of the standard substrate 1, so that the assembling precision is better.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A powder bed fusion additively manufactured fabricated baseplate, comprising:
the standard substrate is provided with at least one assembling groove, and the bottom of the assembling groove is provided with a through hole; and
and the small substrates are in one-to-one correspondence with the assembly grooves, embedded in the assembly grooves on the standard substrate and detachably mounted on the standard substrate.
2. The fabricated substrate for powder bed melting additive manufacturing according to claim 1, wherein the hole is a through hole and/or a threaded hole.
3. The fabricated baseplate for powder bed melting additive manufacturing of claim 2, wherein the small baseplate is shaped as a cylinder; preferably, the cross section of the small substrate is circular and/or rectangular with round corners.
4. The fabricated substrate for powder bed melting additive manufacturing according to claim 3, wherein the small substrate has a prestress after being embedded in the standard substrate; and/or the small base plate and the assembling groove are in transition fit or interference fit.
5. The fabricated substrate for powder bed melting additive manufacturing according to any one of claims 1 to 4, wherein a positioning line is provided on the standard substrate.
6. The fabricated substrate for powder bed melting additive manufacturing according to any one of claims 1 to 5, wherein the shape of the mounting groove is in conformity with the shape of the corresponding small substrate; and/or the depth of the assembling groove is consistent with the thickness of the small substrate.
7. The fabricated substrate for powder bed melting additive manufacturing according to any one of claims 1 to 6, wherein the standard substrate is made of carbon steel or aluminum alloy; and/or the small substrate is made of one or more materials selected from titanium alloy, steel, aluminum alloy, nickel-based alloy, copper alloy and refractory alloy.
8. The method for using the assembled base plate for powder bed melting additive manufacturing of any one of claims 1 to 7, wherein the assembling base plate is disassembled in a mode comprising: the diameter of the replacement rod is smaller than the diameter of the hole and the length of the replacement rod is greater than the depth of the hole by inserting the replacement rod into the hole and ejecting the small base plate from the assembly slot.
9. The method of using a fabricated substrate for powder bed additive manufacturing of claim 8, wherein when the hole is a through hole, the displacement rod is an ejector pin; and/or when the hole is a threaded hole, the replacing rod body is a bolt matched with the threaded hole.
10. The use method of the assembled base plate for powder bed melting additive manufacturing according to claim 8 or 9, wherein the assembling manner of the assembled base plate includes: a gasket is padded on the small substrate, pressure is applied to the gasket, so that the small substrate enters the assembling groove, and the pressure is preferably applied in a hammering mode; or, the small substrate is first low-temperature treated in liquid nitrogen, and then the cooled small substrate is placed in the assembling tank.
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| CN202111275961.XA CN114082991A (en) | 2021-10-29 | 2021-10-29 | Assembled substrate for powder bed melting additive manufacturing and using method thereof |
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| CN202111275961.XA CN114082991A (en) | 2021-10-29 | 2021-10-29 | Assembled substrate for powder bed melting additive manufacturing and using method thereof |
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| CN114749681A (en) * | 2022-06-13 | 2022-07-15 | 天津大学 | 3D printing device suitable for various heterogeneous metal powders and working method thereof |
| CN114951704A (en) * | 2022-04-08 | 2022-08-30 | 南京铖联激光科技有限公司 | Substrate for 3D printer and preparation method thereof |
| CN115475962A (en) * | 2022-09-29 | 2022-12-16 | 中国航发动力股份有限公司 | Integrated device for additive forming and material reducing processing and design method |
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