Magnetohydrodynamic deposition of metal in manufacturing
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B33Y-050/00
B33Y-030/00
B05B-005/025
B22F-003/115
B22F-003/00
B33Y-010/00
B33Y-050/02
출원번호
US-0451260
(2017-03-06)
등록번호
US-10201854
(2019-02-12)
발명자
/ 주소
Sachs, Emanuel Michael
Gibson, Mark Gardner
Hoisington, Paul A.
Fontana, Richard Remo
출원인 / 주소
Desktop Metal, Inc.
대리인 / 주소
Strategic Patents, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
19
초록▼
Devices, systems, and methods are directed to applying magnetohydrodynamic forces to liquid metal to eject liquid metal along a controlled pattern, such as a controlled three-dimensional pattern as part of additive manufacturing of an object. The magnetohydrodynamic force can be pulsed to eject drop
Devices, systems, and methods are directed to applying magnetohydrodynamic forces to liquid metal to eject liquid metal along a controlled pattern, such as a controlled three-dimensional pattern as part of additive manufacturing of an object. The magnetohydrodynamic force can be pulsed to eject droplets of the liquid metal to provide control over accuracy of the object being fabricated. The pulsations can be applied in fluid chambers having high resonance frequencies such that droplet ejection can be effectively controlled over a wide range of frequencies, including high frequencies suitable for liquid metal ejection at rates suitable for commercially viable three-dimensional fabrication.
대표청구항▼
1. An additive manufacturing system, the additive manufacturing system comprising: a nozzle including a housing, one or more magnets, and electrodes, the nozzle defining a fluid chamber having an inlet region and a discharge region, the one or more magnets directing a magnetic field through the hous
1. An additive manufacturing system, the additive manufacturing system comprising: a nozzle including a housing, one or more magnets, and electrodes, the nozzle defining a fluid chamber having an inlet region and a discharge region, the one or more magnets directing a magnetic field through the housing, and the electrodes defining at least a portion of a firing chamber in the fluid chamber between the inlet region and the discharge region, wherein electric current is conductible from the electrodes such that the electric current intersects the magnetic field in the firing chamber at a point substantially adjacent to a discharge orifice of the discharge region;a robotic system mechanically coupled to the nozzle;an electrical power source in electrical communication with the electrodes; anda controller in electrical communication with the robotic system and the electrical power source, the controller configured to move the robotic system to position the discharge region of the nozzle in a controlled three-dimensional pattern, andbased on the position of the discharge region along the controlled three-dimensional pattern, to actuate the electrical power source to deliver pulsed current to the electrodes to eject liquid metal from the discharge region to form a three-dimensional object, wherein a frequency of the pulsed current is less than about 5 kHz at a maximum speed of movement of the discharge region, and the frequency of the pulsed current is based on speed of movement of the nozzle. 2. The additive manufacturing system of claim 1, wherein the frequency of the pulsed current is further based on one or more features of the three-dimensional pattern. 3. An additive manufacturing system, the additive manufacturing system comprising: a nozzle including a housing, one or more magnets, and electrodes, the nozzle defining a fluid chamber having an inlet region and a discharge region, the one or more magnets directing a magnetic field through the housing, and the electrodes defining at least a portion of a firing chamber in the fluid chamber between the inlet region and the discharge region, wherein electric current is conductible from the electrodes such that the electric current intersects the magnetic field in the firing chamber at a point substantially adjacent to a discharge orifice of the discharge region;a robotic system mechanically coupled to the nozzle;an electrical power source in electrical communication with the electrodes; anda controller in electrical communication with the robotic system and the electrical power source, the controller configured to move the robotic system to position the discharge region of the nozzle in a controlled three-dimensional pattern, andbased on the position of the discharge region along the controlled three-dimensional pattern, actuate the electrical power source to deliver pulsed current to the electrodes to eject liquid metal from the discharge region to form a three-dimensional object, wherein the pulsed current has a frequency based on speed of movement of the nozzle. 4. The additive manufacturing system of claim 3, the frequency of the pulsed current is further based on one or more features of the controlled three-dimensional pattern. 5. The additive manufacturing system of claim 4, wherein the frequency of the pulsed current is based on curvature of a perimeter of the controlled three-dimensional pattern at the position of the discharge region along the controlled three-dimensional pattern. 6. The additive manufacturing system of claim 3, wherein the frequency of the pulsed current decreases based on a decrease in speed of movement of the nozzle along the controlled three-dimensional pattern. 7. The additive manufacturing system of claim 3, wherein the controller is further configured to control a velocity of the liquid metal ejected from the discharge region based on the position of the discharge region along the controlled three-dimensional pattern. 8. The additive manufacturing system of claim 7, wherein the controller is configured to control the velocity of the liquid metal based on controlling one or more of magnitude and duration of the pulsed current. 9. The additive manufacturing system of claim 7, wherein the controller is configured to reduce the velocity of the liquid metal ejected from the discharge region along a portion of the controlled three-dimensional pattern corresponding to an interface between a part and a support structure of the three-dimensional object.
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이 특허에 인용된 특허 (19)
Sanjeev Chandra CA; Rahim Jivraj CA, Apparatus and method for generating droplets.
Sackinger Philip A. ; Essien Marcelino ; Peebles Henry C. ; Schlienger Eric M., Apparatus for jet application of molten metal droplets for manufacture of metal parts.
Mahoney John F. (South Pasadena CA) Perel Julius (Altadena CA) Vickers Kenneth E. (Sierra Madre CA), Electrohydrodynamic spraying to produce ultrafine particles.
Hobson David O. (Oak Ridge TN) Alexeff Igor (Oak Ridge TN) Sikka Vinod K. (Clinton TN), Method and apparatus for atomization and spraying of molten metals.
Sterett Robert A. (Jackson MI) Sudhalkar Atul M. (Ann Arbor MI), Method for creating a free-form metal three-dimensional article using a layer-by-layer deposition of a molten metal.
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