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：US12115729B2

公开(公告)日：2024-10-15

申请号：US17610153

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 ,  B29C64/153 ,  B29C64/236 ,  B29C64/245 ,  B29C64/282 ,  B33Y30/00

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

Abstract: An infrared lamp assembly for an apparatus for the formation of three-dimensional objects by consolidation of particulate material, the assembly comprising: an elongate infrared lamp extending along a lamp axis, an elongate shield extending parallel to and along one side of the axis of the lamp, and a support structure holding at least one of the ends of the lamp and of the shield, wherein the elongate shield at least partially bounds the space to one side of the lamp, and wherein the assembly provides a lower opening below the lamp and an upper opening above the lamp, such that, in use, radiation generated by the lamp is able to radiate through the openings and away from the lamp in directions not bounded by the shield.

公开(公告)号：US12086966B2

公开(公告)日：2024-09-10

申请号：US17741984

申请日：2022-05-11

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: G06T5/80 ,  G01J5/00 ,  G01J5/80

CPC classification number: G06T5/80 ,  G01J5/0066 ,  G01J5/80 ,  G01J2005/0077 ,  G06T2207/10048

Abstract: A method for correcting thermal image distortion in a thermal camera in an apparatus for the layer-by-layer manufacture of three-dimensional objects, the thermal camera comprising a plurality of sensor pixels arranged along a first direction; the method comprising the steps of: (a) causing a temperature reference to be at a first steady state temperature; (b) moving the temperature reference at the first steady state temperature through a plurality of positions along the first direction through the field of view of the thermal camera; (c) recording a plurality of thermal images with the thermal camera while moving the temperature reference during step (b), each thermal image corresponding to one of the plurality of positions and comprising the detected temperature of the temperature reference as detected by at least one pixel of the plurality of sensor pixels; (d) identifying the at least one pixel that detected the temperature of the temperature reference within a respective thermal image at the corresponding one of the plurality of positions; (e) constructing a thermal map from the identified pixels representing the detected temperature of the temperature reference at the plurality of positions; (f) generating a correction matrix for the identified pixels based on comparison between the thermal map and the first steady state temperature; and (g) applying the correction matrix to subsequent measurements of the thermal camera. A controller and an apparatus for the layer-by-layer manufacture of three-dimensional objects comprising the controller to carry out the method are also provided.

公开(公告)号：US20230082932A1

公开(公告)日：2023-03-16

申请号：US17943994

申请日：2022-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: B29C64/393 ,  B29C64/153 ,  B33Y50/02 ,  B33Y40/10 ,  B33Y10/00 ,  G01J5/10

Abstract: A method of manufacturing 3D objects with an apparatus having first and second heat sources and a thermal sensor. The method includes carrying out a build process after a thermal calibration process for a thermal control component(s). The calibration and build processes include a layer cycle including (i) providing a layer of particulate material defining a build bed surface; (ia) heating the surface; (ii) depositing absorption modifier over a layer-specific region and/or a surrounding area; (iii) heating the layer-specific region with the first heat source; and (iv) measuring a temperature of the surface after at least one of (i) to (iii). The layer cycle includes heating the surface of each layer with the second heat source and repeating until the calibration/build processes are complete. The outcome of each calibration routine being based on the measured temperature and being applied to the thermal control component for the subsequent layer cycle.

公开(公告)号：US20230082033A1

公开(公告)日：2023-03-16

申请号：US17943814

申请日：2022-09-13

Applicant: Stratasys Powder Production Ltd.

Inventor： Gianluca Dorini

IPC: B29C64/393 ,  B33Y10/00 ,  B33Y50/02 ,  B29C64/165

Abstract: A method for calibrating a heat source, used in manufacturing 3D object(s) from particulate material, including layer cycle steps of: (a) distributing a layer of particulate material; (b) heating a region of the layer with a heat source at a power input over a period of time; (c) measuring the temperature of the region; (d) depositing a radiation absorber over the region and/or an absorption inhibitor over a surrounding area; (e) heating the region and a second region within the surrounding area at a second power input and period of time; and (f) measuring a second temperature of the region and a third temperature of the second region; repeating the layer cycle using different pairs of input powers from the preceding pairs; and determining for each layer an adjusted input power(s); and applying the adjusted input powers to the heat source in steps (b) and (e) for a subsequent cycle.

公开(公告)号：US20230079559A1

公开(公告)日：2023-03-16

申请号：US17943904

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 ,  G01J5/10

Abstract: A method of manufacturing 3D objects in an apparatus having a thermal sensor, a stationary heat source and one or more further heat sources. The method includes a warm up and a build process; each processing multiple layers by a layer cycle. The layer cycles include (a) providing build bed surface of particulate material; (b) heating the surface using the stationary or a first moving heat source; (b1) depositing absorption modifier (absorber) over one or more layer-specific regions and/or depositing absorption modifier (inhibitor) over a surrounding area; (c) heating the surface by the first or a second moving heat source; and (d) measuring the temperature of the surface after (a) and/or (b) and/or (c). During one or more of (a) to (c), heating the surface to a target temperature, such that (c) causes the layer-specific region of each layer to melt and form a portion of the 3D object.