US20230313352A1 - Apparatus and process for producing additive manufactured metal matrix composites and article of manufacture thereof - Google Patents
Apparatus and process for producing additive manufactured metal matrix composites and article of manufacture thereof Download PDFInfo
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- US20230313352A1 US20230313352A1 US18/331,566 US202318331566A US2023313352A1 US 20230313352 A1 US20230313352 A1 US 20230313352A1 US 202318331566 A US202318331566 A US 202318331566A US 2023313352 A1 US2023313352 A1 US 2023313352A1
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- substrate
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- powdered
- metal
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000000654 additive Substances 0.000 title abstract description 3
- 230000000996 additive effect Effects 0.000 title abstract description 3
- 239000011156 metal matrix composite Substances 0.000 title 1
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- 238000007639 printing Methods 0.000 claims abstract description 4
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
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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
Definitions
- the present invention relates generally to three-dimensional fabrication.
- This approach has a number of advantages including: the ability to produce more complex geometries than conventional methods such as milling and casting; improved material properties over conventional metals; higher production rates; the elimination of complex fixturing, complex tool paths and tool changes; and, in the case of casting, the need for patterns and tools.
- FIG. 1 is a metal piece made by the method described in this application.
- FIG. 2 is a flowchart illustrating the steps to produce a 3D metal object in accordance with the teachings of the present invention.
- FIG. 3 shows an apparatus used to selectively deposit liquid (to which powder adheres), in an illustrative implementation of this invention.
- FIG. 4 is a high-level block diagram of processors, in an illustrative implementation of this invention
- FIG. 5 shows a compressive device, after a number of substrate tiles (layers) have been placed in it, one on top of the other in a compressive device. The tiles are aligned by inserting registration pins of the compressive device into the registration holes of each tile, respectively.
- FIG. 6 shows a compressive device, after substrate layers with all of the “slices” of a ring torus have been inserted into it. Springs in the compressive device press the substrate layers together.
- FIG. 7 is a block diagram that shows a processor that controls multiple components of an apparatus for fabricating a 3D object.
- FIG. 1 is a metal piece 100 made by the method described in this application. The method of making this metal piece is described in detail below.
- FIG. 2 is a flowchart illustrating the steps to produce a 3D metal object in accordance with the teachings of the present invention:
- Step 102 Generate a CAD model (Step 102 ) which is sliced into layers (Step 104 ) by using a slicer program like Netfabb as described in (International Publication No. WO 2014/134224 A2. ⁇ 0055; see also US Application Nos. U.S. 61/528,537 and U.S. 61/769,724).
- Each slice also includes registration holes, which will be used to orient each printed layer of substrate within the finished object exactly (International Publication No. WO 2014/134224 A2, ⁇ 00121).
- the output of the slicer which for example may be a bitmap file, is sent to an inkjet printer (Step 106 ).
- the printer selectively prints a fluid onto a sheet of substrate material (Step 108 ) (International Publication No. WO 2014/134224 A2. ⁇ 00113).
- the fluid may either be the bonding agent itself in liquid form; or it may be a liquid to which a powdered bonding agent adheres.
- Substrates can include fiberglass, high temperature glass fibers, boron fibers, or carbon fibers.
- powdered bonding agent If powdered bonding agent is being used, it is flooded onto the printed substrate (International Publication No. WO 2014/134224 A2. ⁇ 0059). The powder adheres to the printed areas. Excess powder is removed, either by a stream of air, vacuum, vibration, or other mechanical means.
- the coated sheets of substrate are stacked in press or clamp (Step 110 ) (International Publication No. WO 2014/134224 A2, ⁇ 00124), using the registration holes of each layer to align the printed portions of each sheet within the stack (International Publication No. WO 2014/134224 A2, ⁇ 00106).
- the unfused substrate around the 3D object is then removed (Step 114 ), usually by abrasive blasting material or chemical means (International Publication No. WO 2014/134224 A2, ⁇ 0081).
- the substrate used is a non-woven carbon fiber veil such as available from Hollingsworth and Vose. Veils that have been metal coated can also be used.
- the veil or substrate is printed as described above on an inkjet printer using, for example, a HP45 thermal inkjet head with a solution primarily of de-ionized water, pyrrolidone and alcohol.
- the solution may have an anti-evaporant including glycols and pyrrolidones.
- This fluid is printed on the area of the substrate that would be part of the object, i.e., the printed area corresponds to a layer shape for the object. This is done for each layer as described in the previous applications.
- Each layer is flooded with a metal powder for example a solder powder.
- the excess powder is removed by mechanical, vacuum, vibration or compressed air or a combination of such methods. This leaves the solder powder selectively deposited.
- a metal powder for example a solder powder.
- the excess powder is removed by mechanical, vacuum, vibration or compressed air or a combination of such methods. This leaves the solder powder selectively deposited.
- One of the problems with using a metal powder in a process of this kind is that the powder oxidizes so that that when heated to its melting point the particles of the powder will not fuse together well.
- a powder flux such as rosin which acts as a reducing agent.
- a typical flux to metal powder ratio is about 50/50.
- Another method is to melt the powders in a reducing, vacuum and/or inert atmosphere oven. In this way other metals or alloys can be used, such as aluminum, steel, stainless steel, copper, brass, and titanium among others.
- liquid flux may be used as or in combination with the
- the metal powder can be mixed with a powder flux before it is deposited on the substrate. Then all the layers of the object are printed and stacked in register as described in the earlier applications. They are compressed and heated as described in the earlier applications. The heating temperature is raised to the melting point of the powder. The layers fuse together and produce a build block. After the build block is removed from the compression jig the build block is abrasively blasted and the areas where no powder adhered, that is the portions of the object that were not coated with metal, are abrasive blasted off, the uncoated carbon fiber being very fragile. What is left is a three dimensional carbon fiber metal composite of the part that was represented by the CAD model.
- FIG. 3 shows an apparatus used to selectively deposit liquid (to which powder adheres), in an illustrative implementation of this invention.
- Registration guide pins 501 are inserted through a substrate layer 503 in order to properly align the substrate layer 503 .
- a solenoid valve, or inkjet head or heads 505 are used to selectively dispense liquid from a liquid reservoir 507 though a nozzle 509 unto the substrate layer 503 .
- the nozzle 509 is rastered in a 2D plane 510 that is parallel to, and above, the substrate layer 503 , so that the liquid is selectively deposited at desired x, y coordinates of the substrate layer 503 , and not deposited in other areas of the substrate layer 503 .
- a stepper motor 511 actuates two belts (not shown) that causes a support member (not shown) to move along two rails (not shown) in a direction parallel to the x axis.
- a second stepper motor (not shown) and third belt (not shown) are mounted on the support member, and are used to move a nozzle support (not shown) in a direction parallel to the y axis.
- the nozzle 509 is attached to the nozzle support. Together, the two stepper motors can move the nozzle 509 to any desired x, y coordinate above the substrate layer.
- a page wide head may also be used.
- a microprocessor 513 controls the stepper motors and the solenoid valve or inkjet head, thereby controlling when and where liquid is dispensed on the substrate layer 503 .
- the stepper motors may cause the nozzle or nozzles 509 to move in other 2D patterns in the 2D plane to cause the liquid to be deposited at certain x, y coordinates.
- FIG. 2 does not show an apparatus for heating and pressing multiple layers of substrate, or for removing excess substrate. In some implementations, the substrate layer is moved to a different position before those steps occur.
- FIG. 4 is a high-level block diagram of processors, in an illustrative implementation of this invention.
- a CAD model of a desired 3D object in STL file format is created using a remote processor 601 .
- This processor 601 employs software (such as Netfabb® Studio software) to create a machine-specific build file.
- the machine-specific build file is exported to a second processor 603 .
- this second processor controls the operation, including movements, of: (1) an inkjet head or other device that selectively deposits liquid, (2) a vibrating trough (and/or compressed air) that spreads out the powder on the substrate and then removes the excess powder.
- this invention may be implemented with other arrangements of processors. For example, more than one remote processor and more than one onboard processor may be employed, and any of the above tasks may be handled by one or more of these different processors.
- FIG. 5 shows a compressive device 803 , after a number of substrate layers (e.g., 801 ) have been placed in it, one on top of the other in order and in registered alignment. Shown are registration pins projecting out of the registration holes of each tile, respectively, to cause such registered alignment.
- substrate layers e.g. 801
- FIG. 6 shows substrate layers being compressed in the compressive device 903 .
- Screws 905 , 907 , 909 , 911 , plates 913 , 915 and a spring 917 in the compressive device are used to exert pressure.
- FIG. 7 is a high-level block diagram of some hardware that may be used in this invention.
- One or more processors 1301 control an applicator 1303 , a heating element 1305 , an actuator 1307 , an artificial pressure source 1309 , and a stirrer in a container of liquid 1311 .
- the applicator 1303 deposits powder in positive regions, but not in negative regions, of substrate layers.
- the heating element 1305 transforms the powder into matter that flows and then hardens.
- the resulting hardened material is disposed in a spatial pattern that infiltrates the substrate layers.
- the artificial pressure source 1309 may comprise a press, clamp, spring, elastic element, or other device for compressing the substrate layers.
- the stirrer may be used to stir a liquid that is used for removing excess substrate.
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Abstract
Description
- This is a divisional of application Ser. No. 16/195,362 filed Nov. 19, 2018, now U.S. Pat. No. 11,173,546 issuing Nov. 16, 2021, which is a continuation of application Ser. No. 15/631,634 filed Jun. 23, 2017, which is a continuation of PCT/US16/62356 filed Nov. 16, 2016, which claimed the benefit of U.S. Provisional Application No. 62/256,436, filed Nov. 17, 2015. This application incorporates the following applications by reference in their entireties (including their drawing figures): Application Nos. U.S. Ser. No. 16/195,362. U.S. Ser. No. 15/631,634. PCT/US16/62356. U.S. 61/528,537, PCT/US12/52946, U.S. Ser. No. 13/582,939; EP20120828967, U.S. 61/769,724, PCT/US14/18806; Ser. No. 14/835,685. U.S. Ser. No. 14/835,690. U.S. Ser. No. 14/835,697, U.S. Ser. No. 14/703,372, U.S. 62/243,590, U.S. 61/773,810, U.S. Ser. No. 14/199,603, U.S. 61/914,613 and U.S. Ser. No. 14/566,661.
- The present invention relates generally to three-dimensional fabrication.
- International Publication No. WO 2014/134224 A2 (corresponding to Application No. PCT/US14/18806) entitled “Methods and Apparatus for Three-Dimensional Composites” (as well as Application Nos. U.S. 61/528,537; PCT/US12/52946; U.S. Ser. No. 13/582,939; EP20120828967; U.S. 61/769,724: U.S. Ser. No. 14/835,685; U.S. Ser. No. 14/835,690; U.S. Ser. No. 14/835,697; U.S. Ser. No. 14/703,372; U.S. 62/243,590) describes a “layered” method and apparatus for producing three dimensional objects called “Composite Based Additive Manufacturing” or CBAM that produces a three-dimensional object using generally substrates, typically fibrous substrates and polymers. The present invention references International Publication No. WO 2014/134224 A2, and describes use of the technique described in the International Publication with metals.
- The CBAM method described in International Publication No. WO 2014/134224 A2 extends the range of materials that can be used with 3D printing to create three-dimensional objects. Until recently, work on this technique has concentrated on using various substrates, including carbon fiber, polymer based material and natural fibers among others and various polymers as bonding agents. This application describes the application of the CBAM method and apparatus to produce objects in metal, and in metal fiber hybrids or composites. This application also describes an article of manufacture thereof.
- This approach has a number of advantages including: the ability to produce more complex geometries than conventional methods such as milling and casting; improved material properties over conventional metals; higher production rates; the elimination of complex fixturing, complex tool paths and tool changes; and, in the case of casting, the need for patterns and tools.
-
FIG. 1 is a metal piece made by the method described in this application. -
FIG. 2 is a flowchart illustrating the steps to produce a 3D metal object in accordance with the teachings of the present invention. -
FIG. 3 shows an apparatus used to selectively deposit liquid (to which powder adheres), in an illustrative implementation of this invention. -
FIG. 4 is a high-level block diagram of processors, in an illustrative implementation of this inventionFIG. 5 shows a compressive device, after a number of substrate tiles (layers) have been placed in it, one on top of the other in a compressive device. The tiles are aligned by inserting registration pins of the compressive device into the registration holes of each tile, respectively. -
FIG. 6 shows a compressive device, after substrate layers with all of the “slices” of a ring torus have been inserted into it. Springs in the compressive device press the substrate layers together. -
FIG. 7 is a block diagram that shows a processor that controls multiple components of an apparatus for fabricating a 3D object. -
FIG. 1 is ametal piece 100 made by the method described in this application. The method of making this metal piece is described in detail below. -
FIG. 2 is a flowchart illustrating the steps to produce a 3D metal object in accordance with the teachings of the present invention: - 1. Generate a CAD model (Step 102) which is sliced into layers (Step 104) by using a slicer program like Netfabb as described in (International Publication No. WO 2014/134224 A2. ¶0055; see also US Application Nos. U.S. 61/528,537 and U.S. 61/769,724). Each slice also includes registration holes, which will be used to orient each printed layer of substrate within the finished object exactly (International Publication No. WO 2014/134224 A2, ¶00121).
- 2. The output of the slicer, which for example may be a bitmap file, is sent to an inkjet printer (Step 106). For each layer, the printer selectively prints a fluid onto a sheet of substrate material (Step 108) (International Publication No. WO 2014/134224 A2. ¶00113). The fluid may either be the bonding agent itself in liquid form; or it may be a liquid to which a powdered bonding agent adheres. Substrates can include fiberglass, high temperature glass fibers, boron fibers, or carbon fibers.
- 3. If powdered bonding agent is being used, it is flooded onto the printed substrate (International Publication No. WO 2014/134224 A2. ¶0059). The powder adheres to the printed areas. Excess powder is removed, either by a stream of air, vacuum, vibration, or other mechanical means.
- 4. The coated sheets of substrate are stacked in press or clamp (Step 110) (International Publication No. WO 2014/134224 A2, ¶00124), using the registration holes of each layer to align the printed portions of each sheet within the stack (International Publication No. WO 2014/134224 A2, ¶00106).
- 5. The assembled sheets are then heated and possibly compressed in an oven, to melt the bonding material and fusing the layers of substrate to form the 3D object (Step 112) (International Publication No. WO 2014/134224 A2, ¶00149).
- 6. The unfused substrate around the 3D object is then removed (Step 114), usually by abrasive blasting material or chemical means (International Publication No. WO 2014/134224 A2, ¶0081).
- Issues in Using Metals with the Technique
- It has been discovered that metals can be used with this technique. In one example the substrate used is a non-woven carbon fiber veil such as available from Hollingsworth and Vose. Veils that have been metal coated can also be used. The veil or substrate is printed as described above on an inkjet printer using, for example, a HP45 thermal inkjet head with a solution primarily of de-ionized water, pyrrolidone and alcohol. The solution may have an anti-evaporant including glycols and pyrrolidones. This fluid is printed on the area of the substrate that would be part of the object, i.e., the printed area corresponds to a layer shape for the object. This is done for each layer as described in the previous applications. Each layer is flooded with a metal powder for example a solder powder. The excess powder is removed by mechanical, vacuum, vibration or compressed air or a combination of such methods. This leaves the solder powder selectively deposited. One of the problems with using a metal powder in a process of this kind is that the powder oxidizes so that that when heated to its melting point the particles of the powder will not fuse together well. There are a number of solutions to this problem, one such solution is to mix the metal powder with a powder flux such as rosin which acts as a reducing agent. A typical flux to metal powder ratio is about 50/50. Another method is to melt the powders in a reducing, vacuum and/or inert atmosphere oven. In this way other metals or alloys can be used, such as aluminum, steel, stainless steel, copper, brass, and titanium among others. In addition liquid flux may be used as or in combination with the printing fluid, through selective deposition methods such as inkjet printing.
- As an example the metal powder can be mixed with a powder flux before it is deposited on the substrate. Then all the layers of the object are printed and stacked in register as described in the earlier applications. They are compressed and heated as described in the earlier applications. The heating temperature is raised to the melting point of the powder. The layers fuse together and produce a build block. After the build block is removed from the compression jig the build block is abrasively blasted and the areas where no powder adhered, that is the portions of the object that were not coated with metal, are abrasive blasted off, the uncoated carbon fiber being very fragile. What is left is a three dimensional carbon fiber metal composite of the part that was represented by the CAD model.
-
FIG. 3 shows an apparatus used to selectively deposit liquid (to which powder adheres), in an illustrative implementation of this invention. Registration guide pins 501 are inserted through asubstrate layer 503 in order to properly align thesubstrate layer 503. A solenoid valve, or inkjet head or heads 505 are used to selectively dispense liquid from aliquid reservoir 507 though anozzle 509 unto thesubstrate layer 503. Thenozzle 509 is rastered in a2D plane 510 that is parallel to, and above, thesubstrate layer 503, so that the liquid is selectively deposited at desired x, y coordinates of thesubstrate layer 503, and not deposited in other areas of thesubstrate layer 503. To achieve this rastering, astepper motor 511 actuates two belts (not shown) that causes a support member (not shown) to move along two rails (not shown) in a direction parallel to the x axis. A second stepper motor (not shown) and third belt (not shown) are mounted on the support member, and are used to move a nozzle support (not shown) in a direction parallel to the y axis. Thenozzle 509 is attached to the nozzle support. Together, the two stepper motors can move thenozzle 509 to any desired x, y coordinate above the substrate layer. A page wide head may also be used. Amicroprocessor 513 controls the stepper motors and the solenoid valve or inkjet head, thereby controlling when and where liquid is dispensed on thesubstrate layer 503. Alternately, rather than rastering in a line-by-line pattern, the stepper motors may cause the nozzle ornozzles 509 to move in other 2D patterns in the 2D plane to cause the liquid to be deposited at certain x, y coordinates.FIG. 2 does not show an apparatus for heating and pressing multiple layers of substrate, or for removing excess substrate. In some implementations, the substrate layer is moved to a different position before those steps occur. -
FIG. 4 is a high-level block diagram of processors, in an illustrative implementation of this invention. A CAD model of a desired 3D object in STL file format is created using aremote processor 601. Thisprocessor 601 employs software (such as Netfabb® Studio software) to create a machine-specific build file. The machine-specific build file is exported to asecond processor 603. Depending on the particular implementation, this second processor controls the operation, including movements, of: (1) an inkjet head or other device that selectively deposits liquid, (2) a vibrating trough (and/or compressed air) that spreads out the powder on the substrate and then removes the excess powder. Alternately, this invention may be implemented with other arrangements of processors. For example, more than one remote processor and more than one onboard processor may be employed, and any of the above tasks may be handled by one or more of these different processors. - As described in WO2014134224 ¶183 (the entirety of the publication which is incorporated by reference), the printed
carbon fiber substrate 801 is placed onto a fixture using registration holes to align.FIG. 5 shows acompressive device 803, after a number of substrate layers (e.g., 801) have been placed in it, one on top of the other in order and in registered alignment. Shown are registration pins projecting out of the registration holes of each tile, respectively, to cause such registered alignment. -
FIG. 6 shows substrate layers being compressed in thecompressive device 903.Screws plates spring 917 in the compressive device are used to exert pressure. -
FIG. 7 is a high-level block diagram of some hardware that may be used in this invention. One ormore processors 1301 control anapplicator 1303, aheating element 1305, anactuator 1307, anartificial pressure source 1309, and a stirrer in a container of liquid 1311. Theapplicator 1303 deposits powder in positive regions, but not in negative regions, of substrate layers. Theheating element 1305 transforms the powder into matter that flows and then hardens. The resulting hardened material is disposed in a spatial pattern that infiltrates the substrate layers. Theartificial pressure source 1309 may comprise a press, clamp, spring, elastic element, or other device for compressing the substrate layers. The stirrer may be used to stir a liquid that is used for removing excess substrate.
Claims (5)
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2016
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- 2016-11-16 CN CN201680078140.8A patent/CN108472727A/en active Pending
- 2016-11-16 JP JP2018526517A patent/JP2018537587A/en active Pending
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JP2023113828A (en) | 2023-08-16 |
EP3377249B1 (en) | 2022-11-02 |
CN118023550A (en) | 2024-05-14 |
US20220072611A1 (en) | 2022-03-10 |
EP3377249A1 (en) | 2018-09-26 |
US20190084046A1 (en) | 2019-03-21 |
EP3377249A4 (en) | 2019-12-11 |
WO2017087572A1 (en) | 2017-05-26 |
JP2021179014A (en) | 2021-11-18 |
US20170291223A1 (en) | 2017-10-12 |
CN108472727A (en) | 2018-08-31 |
KR102597223B1 (en) | 2023-11-03 |
US11173546B2 (en) | 2021-11-16 |
KR20180097550A (en) | 2018-08-31 |
US11674207B2 (en) | 2023-06-13 |
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