公开(公告)号：US20230091823A1

公开(公告)日：2023-03-23

申请号：US17943621

申请日：2022-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: B29C64/393 ,  B29C64/153 ,  B33Y10/00 ,  B33Y50/02 ,  B33Y40/10

Abstract: A method for calibrating heat source(s) in an apparatus for manufacturing 3D objects including layer cycle steps of: distributing a layer of particulate material over a build bed; heating the layer with a heat source at a first power profile; measuring a set of temperatures at multiple regions; depositing absorption modifier (absorber) over each region and/or depositing absorption modifier (inhibitor) over a surrounding area; heating each region with the heat source or a second heat source at a second input power profile; and measuring a second set of temperatures at each region; repeating the layer cycle using different input power profiles; and determining an adjusted first and/or second input power profile, wherein when applied during a subsequent layer cycle, causes a subsequent measured set of temperatures to be within a range of target temperatures, such that the ranges are reduced over those measured for each of the calibration layers.

公开(公告)号：US12138859B2

公开(公告)日：2024-11-12

申请号：US18367346

申请日：2023-09-12

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini ,  Anders Hartmann ,  Marcel Garrido Barrabes ,  Steffen Kongensbjerg Larsen

IPC: B29C64/286 ,  B29C64/153 ,  B29C64/236 ,  B29C64/245 ,  B29C64/282 ,  B33Y30/00

Abstract: An apparatus for formation of three-dimensional objects and having an infrared radiation deflector. The radiation deflector includes opposing first and second elongate side walls; at least one end support connecting the side walls; an upper opening and a lower opening arranged to pass lamp radiation to an exterior of the radiation deflector; and a mounting point provided at the/each end support for mounting an infrared lamp. The side walls include first and second elongate mirrors extending parallel to a lamp axis and along a lower internal portion of the respective side walls. The lamp axis extends along and between the first and second mirrors, each of which has a concave surface with respect to the lamp axis. The first mirror is an upward deflecting mirror and is arranged for redirecting at least a portion of direct lamp radiation through the upper opening.

公开(公告)号：US20240157632A1

公开(公告)日：2024-05-16

申请号：US18546734

申请日：2021-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini ,  Anders HARTMANN ,  Neil HOPKINSON ,  Frederik TJELLESEN

IPC: B29C64/153 ,  B29C64/236 ,  B29C64/277 ,  B29C64/295 ,  B29C64/393 ,  B33Y10/00 ,  B33Y50/02

CPC classification number: B29C64/153 ,  B29C64/236 ,  B29C64/277 ,  B29C64/295 ,  B29C64/393 ,  B33Y10/00 ,  B33Y50/02

Abstract: A controller and method for layer-by-layer manufacturing of a three-dimensional object from a powder. The method includes, in a first direction across a build area: moving a droplet deposition unit and depositing a radiation absorber onto regions of a previously applied layer of powder; moving a first radiation source according to a first velocity profile whilst activating the first radiation source to fuse the regions of powder where the absorber has been deposited; moving a powder distributor according to a second velocity profile and distributing a fresh layer of powder; and moving a second radiation source whilst activating the second radiation source to preheat the fresh layer of powder. The method further includes adjusting the first and/or second velocity profiles to control a time interval between the passing of the first radiation source and the powder distributor.

公开(公告)号：US20230079989A1

公开(公告)日：2023-03-16

申请号：US17943438

申请日：2022-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: B29C64/165 ,  B29C64/209 ,  B29C64/282 ,  B29C64/314 ,  B29C64/393 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y50/02

Abstract: A method for determining a set point for a thermal sensor. The method includes (a) distributing a layer of particulate material to provide a build bed surface; (b) depositing an amount of absorption modifier over a test region or a surrounding area; (c) heating the test region; (d) measuring a temperature value within the test region with the sensor; (e) distributing a new layer of material over the preceding layer; repeating (b) to (e) until the material of the test region starts to melt, wherein repeated step (b) deposits additional absorption modifier over the test region to absorb more energy from the heat source than the preceding layer; determining a set point for the thermal sensor from a characteristic in the evolution of the measured temperature value within the test region; and applying the set point to subsequent measurements of the thermal sensor.

公开(公告)号：US20240123686A1

公开(公告)日：2024-04-18

申请号：US18484693

申请日：2023-10-11

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini ,  Christoffer Raad Petersen ,  Torben Lange ,  Anders Hartmann ,  David Armand ,  Kristian Noergaard

IPC: B29C64/295 ,  B29C64/153 ,  B29C64/343 ,  B29C64/386

CPC classification number: B29C64/295 ,  B29C64/153 ,  B29C64/343 ,  B29C64/386 ,  B33Y10/00

Abstract: A method of operating an apparatus for the layerwise manufacture of 3D objects. The method includes two or more operational cycles of a warm up phase, starting from ambient, followed by a build phase and a cooling phase. The warm up phase and the build phase each include a layer cycle of: (a) dosing build material to the work surface; (b) distributing a portion of the dosed amount over a build area; (c) heating the dosed amount; and (d) monitoring a temperature of the build material to determine a thermal state. The build phase includes melting layer-specific regions. These steps are repeated until the warm up and build phases are completed. A property of the subsequent warm up phases is determined such that the duration of a subsequent warm up phase is shorter than the duration of a preceding warm up phase.

公开(公告)号：US11787116B2

公开(公告)日：2023-10-17

申请号：US17784523

申请日：2020-12-11

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini ,  Anders Hartmann ,  Marcel Garrido Barrabes ,  Steffen Kongensbjerg Larsen

IPC: B29C64/286 ,  B33Y30/00 ,  B29C64/282 ,  B29C64/153 ,  B29C64/245 ,  B29C64/236

CPC classification number: B29C64/286 ,  B29C64/153 ,  B29C64/236 ,  B29C64/245 ,  B29C64/282 ,  B33Y30/00

Abstract: An infrared radiation deflector (100) for an elongate infrared lamp (110), the radiation deflector (100) comprising opposing first and second elongate side walls (130_1, 130_2); at least one end support (170) connecting the ends of the side walls (130_1, 130_2); an upper opening (140) and a lower opening (150) arranged to pass lamp radiation to an exterior of the radiation deflector (100); and a mounting point (172) provided at the/each end support (170) for mounting the infrared lamp (110) and defining between them a lamp axis location (114); wherein the first and second elongate side walls (130_1, 130_2) comprise a first elongate mirror (130_1) and a second elongate mirror (130_2) extending parallel to the lamp axis location (114) and along at least a lower internal portion of the respective first and second side walls (130_1, 130_2); wherein the lamp axis location (114) extends along and between the first mirror (130_1) and the second mirror (130_2), the first and second mirror (130_1, 130_2) each having a concave surface with respect to the lamp axis location (114); and wherein the first mirror (130_1) is an upward deflecting mirror and further arranged to be concave with respect to the upper opening (140) for redirecting at least a portion of direct lamp radiation through the upper opening (140).

公开(公告)号：US20230078159A1

公开(公告)日：2023-03-16

申请号：US17943546

申请日：2022-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: G01J5/80 ,  B29C64/165 ,  B33Y40/10 ,  G01J5/08 ,  B29C64/393 ,  B29C64/209 ,  B29C64/277 ,  B33Y10/00 ,  B33Y50/02 ,  B29C64/153 ,  B29C64/314 ,  G01J5/00

Abstract: A method for determining a set point for a thermal sensor. The method includes: (a) distributing a layer of particulate material forming a build bed surface; (b) optionally, preheating the layer to a temperature below its melting temperature; (c) measuring a first temperature value with a primary or secondary thermal sensor; (d) depositing absorption modifier over the test region and/or surrounding area; (e) heating the test region; (f) measuring a second temperature value with the primary sensor; (g) distributing another layer of material over the preceding layer; repeating steps (b) to (g), such that the test region of each layer reaches a higher temperature than that of the preceding layer, at least until the test region starts to melt; determining a set point for the primary sensor from a characteristic in the evolution of the measured temperature values; and applying the set point to subsequent measurements of the primary sensor.

公开(公告)号：US11986998B2

公开(公告)日：2024-05-21

申请号：US17782817

申请日：2020-12-03

Applicant: Stratasys Powder Production Ltd.

Inventor： Marcel Garrido ,  Anders Hartmann ,  Gianluca Dorini ,  Simon Bak ,  Hans Niels-Christiansen

IPC: B29C64/165 ,  B29C64/209 ,  B29C64/264 ,  B29C64/364 ,  B29C64/393 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02

CPC classification number: B29C64/165 ,  B29C64/209 ,  B29C64/264 ,  B29C64/364 ,  B29C64/393 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02

Abstract: An apparatus (1) for manufacturing a three-dimensional object from particulate material, the apparatus comprising: • a work space (100) bounded by a first side wall (100A) on a first side of the work space, and a second side wall (100B) on a second side of the work space, the first side wall opposing the second side wall; • a build bed (170) having a build bed surface (160), the build bed surface being comprised in the floor of the work space and having a first edge (160′) on the first side of the work space, towards the first side wall, and a second edge (160″) on the second side of the work space, towards the second side wall; • a first gas inlet (101A) at or near the first side wall; • a second gas inlet (101B) at or near the second side wall; • a first gas outlet (102A) above the floor (100C) of the work space, the position of the first gas outlet being coincident with the first edge of the build bed surface, or between the first edge of the build bed surface and the first gas inlet; and • a second gas outlet (102B) above the floor of the work space, the position of the second gas outlet being coincident with the second edge of the build bed surface, or between the second edge of the build bed surface and the second gas inlet; • wherein the first gas outlet is positioned higher in the work space than the first gas inlet, and the second gas outlet is positioned higher in the work space than the second gas inlet; and • wherein one or more flow devices (210, 211, 212) are operable to create first and second gas flows between the first gas inlet and the first gas outlet, and between the second gas inlet and the second gas outlet, respectively, such as to create respective first and second gas curtains on the first and second sides of the work space in use.

公开(公告)号：US20240123687A1

公开(公告)日：2024-04-18

申请号：US18484643

申请日：2023-10-11

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini ,  Christoffer Raad Petersen ,  Anders Hartmann ,  David Armand

IPC: B29C64/343 ,  B29C64/214 ,  B29C64/295 ,  B29C64/393 ,  B33Y10/00 ,  B33Y50/02

CPC classification number: B29C64/343 ,  B29C64/214 ,  B29C64/295 ,  B29C64/393 ,  B33Y10/00 ,  B33Y50/02

Abstract: A method of operating an apparatus for the layerwise manufacture of 3D objects. The method includes a warm up phase followed by a build phase. The phases each include a cycle of (a) dosing an amount of build material from a dosing device; (b) pushing a portion of the dosed amount across a build area into a receiving chamber; (c) heating the dosed amount at one or both of (a) and (b); repeating (a) to (c) until each phase is complete. During the build phase, at step (b) a layer is formed over the build area and, at step (c), build material within a layer-specific region is selectively melted. Over a given duration of time, an aggregate volume of build material pushed into the receiving chamber during the warm up phase is larger than an aggregate volume of build material pushed into the receiving chamber during the build phase.

公开(公告)号：US20230191694A1

公开(公告)日：2023-06-22

申请号：US17920677

申请日：2021-04-22

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: B29C64/165 ,  B29C64/153 ,  B29C64/393 ,  B29C64/264 ,  B22F10/28 ,  B22F12/46 ,  B22F12/90 ,  B22F10/31 ,  G01J5/80

CPC classification number: B29C64/165 ,  B29C64/153 ,  B29C64/393 ,  B29C64/264 ,  B22F10/28 ,  B22F12/46 ,  B22F12/90 ,  B22F10/31 ,  G01J5/80 ,  B33Y10/00

Abstract: A method for determining a set point for measurements from a temperature sensor of an apparatus for the layer-by-layer formation of a three-dimensional object from particulate material, and associated controllers. The method includes distributing a calibration layer of particulate material over a build bed surface; selectively applying absorption-modifying fluid to a reference area or a surrounding area thereof, on the build bed surface; (c) lowering the build bed surface to a calibration depth, (d) applying heat to the reference area using a moveable heat source while measuring the temperature increase of a sub-reference area over a duration of time and/or taking optical readings of an optical property of the sub-reference area over the duration of time; (e) determining the onset of fusion of the particulate material; and (f) applying the onset of fusion as the set point for subsequent temperature measurements.