IPC分类号：
B29C64/209 | B29C64/153 | B33Y10/00 | B33Y30/00 | B23K26/342 | B22F10/30 | B23K15/00 | B23K26/144 | B23K26/14 | B23K26/70 | B23K37/00 | B33Y50/02 | B22F10/25 | B22F12/20 | B22F12/53 | B22F12/47
当前申请(专利权)人：
HAMILTON SUNDSTRAND CORPORATION
原始申请(专利权)人：
HAMILTON SUNDSTRAND CORPORATION
当前申请(专利权)人地址：
Four Coliseum Centre 2730 West Tyvola Road, Charlotte, NC, US
发明人：
ACHARYA, RANADIP | STAROSELSKY, ALEXANDER | EL-WARDANY, TAHANY IBRAHIM | FENNESSY, COLETTE O.
摘要：
An additive manufacturing assembly includes a substrate (26), a nozzle (30) for depositing additive material onto the substrate, and at least one cooling nozzle (40) for supplying a cooling fluid to at least a portion of the substrate. The at least one cooling nozzle is movable relative to the substrate. A controller (50) is operably coupled to the cooling nozzle. The controller is programmed to control operation of the at least one cooling nozzle to achieve a desired convection heat transfer coefficient of the additive material.
技术问题语段：
The patent text is about a method called direct energy deposition, which uses lasers to build components layer by layer. This process can create high stresses and difficult-to-control microstructures, which can affect the mechanical properties of the component. The text discusses the challenges that additive manufacturing faces in creating complex precision net-shape components. The technical problem of the patent is how to improve the cooling of the deposit formed via an additive manufacturing process to avoid high residual stresses and better control the microstructure of the component.
技术功效语段：
This patent describes an additive manufacturing assembly that can control the flow and angle of cooling fluid to improve the process of depositing additive material onto a substrate. By controlling these factors, the assembly can control the heat transfer and morphology of the additive material, resulting in better quality and performance of the manufactured components. The methods and apparatus described allow for precise control over the conveictive heat transfer coefficient, resulting in better quality and performance of the manufactured components.
权利要求：
1. An additive manufacturing assembly comprising: a substrate (26); a nozzle (32) for depositing additive material onto the substrate; a plurality of cooling nozzles (40) for supplying a cooling fluid to at least a portion of the substrate, the cooling nozzles being movable relative to the substrate; and a controller (50) operably coupled to the cooling nozzles, wherein the controller is programmed to control operation of the cooling nozzles to achieve a desired convection heat transfer coefficient of the additive material; and further comprising an energy source (22) for directing an energy beam (24) onto the substrate, the energy source being coupled to the controller and movable relative to the substrate in a scan direction, the plurality of cooling nozzles being positioned circumferentially about the energy source; and wherein the cooling nozzles are divided into various regions based on their position about the energy source and the scan direction, and wherein the controller is programmed to select a region of cooling nozzles for supplying the cooling fluid based on the scan direction.
2. The additive manufacturing assembly of claim 1, wherein the controller (50) is programmed to control an angle of the at least one cooling nozzle (40) relative to the substrate (26), and/or wherein the controller is programmed to control a flow rate of the cooling fluid output from at least one cooling nozzle.
3. The additive manufacturing assembly of claim 2, wherein the energy beam (24) forms a melt pool (28) in the substrate, and the controller is programmed to position at least one nozzle such that the cooling fluid is directed toward a trailing edge of the melt pool.
4. The additive manufacturing assembly of claim 2, wherein the energy source (22) is movable relative to the substrate in a scan direction, a portion of plurality of cooling nozzles is arranged forward of the energy source with respect to the scan direction and another portion of the plurality cooling nozzles is disposed behind the energy source with respect to the scan direction.
5. The additive manufacturing assembly of claim 4, wherein the controller (50) controls the another portion of the plurality cooling nozzles to achieve the desired convection heat transfer coefficient.
6. The additive manufacturing assembly of claim 4 or 5, wherein the portion of plurality of cooling nozzles arranged forward of the energy source with respect to the scan direction is non-operational.
7. The additive manufacturing assembly of any preceding claim, wherein the desired convection heat transfer coefficient is selected to control a morphology of the additive material deposited on the substrate.
8. A method of forming a three-dimensional build object on a substrate, the method comprising: depositing additive material onto the substrate; directing an energy beam toward a surface of the substrate to form a melt pool; and controlling a convective heat transfer coefficient of the additive material deposited onto the substrate; wherein controlling the convection heat transfer coefficient includes directing a flow of cooling fluid toward the substrate, and wherein directing a flow of cooling fluid toward the substrate includes operating at least one cooling nozzle positioned behind an energy source relative to a scan direction, wherein the cooling nozzles are divided into various regions based on their position about the energy source and the scan direction, and wherein the method includes selecting a region of cooling nozzles for supplying the cooling fluid based on the scan direction.
9. The method of claim 8, wherein controlling the convection heat transfer coefficient includes controlling an orientation of one or more cooling nozzles relative to the substrate, or wherein controlling the convection heat transfer coefficient includes controlling a flow rate of the cooling fluid.
10. The method of any of claims 8 and 9, wherein depositing additive material onto the substrate further comprises: directing a mixture of additive material and propellant gas onto the melt pool.
11. The method of any of claims 8 to 10, further comprising selecting the convective heat transfer coefficient based on a desired morphology of the additive material.