Device and method for constructing a laminar body comprising at least one position-adjustable body defining the working area

• US 9,649,812 B2
• Filed: 12/21/2015
• Issued: 05/16/2017
• Est. Priority Date: 01/05/2011
• Status: Active Grant

• Current Assignee: Voxeljet AG
• Original Assignee: Voxeljet AG
• Inventors: Hartmann, Andreas Dominik, Schmid, Dominik
• Primary Examiner(s): THEISEN, MARY LYNN F
• Application Number:
  US14/976,586
• Publication Number:
  US 20160107386A1
• Time in Patent Office: 512 Days
• Field of Search: None
• CPC Class Codes: B22F 10/00 Additive manufacturing of workpieces or articles from metallic powder apparatus or devices therefor B22F12/00
• CPC Class Codes: B22F 10/14 by jetting of binder onto a bed of metal powder
• CPC Class Codes: B22F 10/16 by embedding the binder within the powder bed
• CPC Class Codes: B22F 10/68 Cleaning or washing
• CPC Class Codes: B22F 12/47 parallel to the deposition plane
• CPC Class Codes: B22F 12/55 Two or more means for feeding material
• CPC Class Codes: B29C 64/153 using layers of powder being selectively joined, e.g. by selective laser sintering or melting
• CPC Class Codes: B29C 64/165 using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
• CPC Class Codes: B29C 64/20 Apparatus for additive manufacturing; Details thereof or accessories therefor
• CPC Class Codes: B29C 64/209 Heads; Nozzles
• CPC Class Codes: B29C 64/35 Cleaning
• CPC Class Codes: B29K 2105/16 Fillers
• CPC Class Codes: B29K 2509/00 Use of inorganic materials not provided for in groups B29K2503/00 - B29K2507/00, as filler
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor

Abstract

The invention relates to a device (13) for constructing a laminar body (5) from a plurality of superimposed layers of free-flowing material, in particular particulate material, an a build platform (6) within a working area (11). The layers are solidified in locally predetermined regions by the actions of binders and are joined together so that at least one molded body (4) is formed by the solidified and joined regions of the layers. The device comprises a discharging device (1) movable back and forth over the working area (11) in at least one discharge direction and having at least one discharge opening (14) from which the free-flowing material can be discharged in individual superimposed layers during the movement of the discharging device (1). According to the invention at least one body (8, 8a) defining the working area (11) in at least one discharge direction of the discharging device (1) and the build platform (6) are adjustable vertically relative to each other in accordance with the specific progress with which the laminar body (5) is being constructed, in such a manner that a surface of the at least one body (8, 8a) facing the discharge opening (14) is aligned flush with a laminar body (5) topmost layer that is yet to be produced or has already been produced, in order to dose the discharge opening (14) of the discharging device (1) and prevent the discharging device from discharging free-flowing material or in order to discharge free-flowing material not used for the laminar construction into a collecting container (7) when the discharge opening (14) is located above the body (8, 8a).

Claims

1. A method comprising:

i. constructing an article from a plurality of superimposed layers of free-flowing material, on a build platform within a first build space, the layers being solidified and joined together in locally predetermined areas by the action of a binder, so that at least one molding is formed by the solidified and joined areas of the layers, wherein the first build space is at least partially defined by a body; and

ii. adjusting the body to define a second build space different from the first build space, and constructing a second article in the second build space;

wherein the free-flowing material is applied from a discharge device and the binder is applied from a print head;

wherein the discharge device and print head move back and forth over the build space;

wherein the first build space is enclosed by one or more printed walls of the free-flowing material being solidified and joined together by the action of the binder;

wherein the build platform is stationary and the discharge device and the print head are movable with respect to the stationary build platform.

2. The method of claim 1, wherein the second build space is larger than the first build space.

3. The method of claim 2, wherein the second build space includes the first build space.

4. The method of claim 3, wherein the second build space is enclosed by one or more walls of the free-flowing material being solidified and joined together by the action of the binder.

5. The method of claim 4, wherein the layers of free-flowing material are discharged from a discharging device, wherein the discharging device is displacement-controlled with regard to a discharge route extending from a starting position at one edge of the build space to an opposite edge of the build space.

6. The method of claim 5, wherein the method includes moving the discharging device while discharging free-flowing material for constructing a layer and providing a locally predetermined area of the discharged layer with the binder.

7. A method comprising:

i. constructing at least one first article from a plurality of superimposed layers of free-flowing particulate material, on a build platform within a first build space, the layers being solidified and joined together in locally predetermined areas by the action of a binder, including;

applying the free-flowing particulate material from a discharge device in layers, and applying the binder from a print head;

wherein the discharge device and the print head move back and forth over the first build space;

wherein the build platform is stationary and the discharge device and the print head are movable with respect to the stationary build platform;

the discharge device applies the free-flowing particulate material at a time when the print head is not applying binder; and

the print head applies the binder at a time when the discharge device is not applying the free-flowing particulate material;

adjusting the height of the discharge device relative to the stationary build platform;

juxtapositioning the discharge device with an uppermost layer of the free-flowing particulate material; and

forming an outer wall at an edges of the first build space, the outer wall surrounding the build space so that loose free-flowing particulate material within the first build space is prevented from flowing off into areas outside of the first build space;

 

wherein the outer wall is a printed wall of the free-flowing particulate material being solidified and joined together by the action of the binder;

 

wherein the at least one first article is formed by the solidified and joined areas of the layers within the first build space; and

ii. following the constructing of the at least one first article, repeating (i) for constructing at least one second article in a second build space, wherein the first build space and the second build space are different build spaces over the build platform;

wherein the discharge device and the print head both move in the same direction during the step of applying the binder.

8. The method of claim 7, wherein the discharge device has an opening including an elongated slot.

9. The method of claim 7, wherein the method includes

a step of reclaiming and reusing excess free-flowing particulate material;

and

a step of removing the at least one first article before constructing the at least one second article; and

wherein the second build space includes the first build space.

10. The method of claim 7, wherein the second build space is larger than the first build space.

11. The method of claim 10, wherein a layer is completed in one pass of the discharge device in a horizontal direction.

12. The method of claim 10, wherein the step of applying the free-flowing particulate material and the binder includes:

moving the print head and the discharge device together in a first direction; and

then

moving the print head and the discharge device together in a second direction opposite the first direction.

13. The method of claim 12, wherein the discharge device is movable in the x, y, and z directions, and a discharge layer is aligned flush with the topmost layer of the superimposed layers.

14. The method of claim 13, wherein the method includes moving the discharge device while discharging the free-flowing particulate material for constructing a layer and providing a locally predetermined area of the discharged layer with the binder.

15. The method of claim 14, wherein the layers of free-flowing particulate material are discharged from a discharge device, wherein the discharge device is displacement-controlled with regard to a discharge route extending from a starting position at one edge of the build space to an opposite edge of the build space.

16. The method of claim 8, wherein the step of applying the free-flowing particulate material and the binder includes:

moving the print head and the discharge device together in a forward horizontal direction; and

then

moving the print head and the discharge device together in a reverse horizontal direction different from the forward horizontal direction.

17. The method of claim 15, wherein the free-flowing particulate material includes a sand.

18. The method of claim 17, wherein in the first build space, a region between the at least one first article and the outer wall is filled with the loose free-flowing particulate material.

19. The method of claim 18, wherein the build space is enclosed by one or more printed walls including the outer wall and the one or more printed walls enclosing the first build space are generally vertical and free of support by a solid support structure outside of the first build space.

20. The method of claim 18, wherein loose free-flowing material outside of the first build space is unsupported relative to the superimposed layers during the constructing of the first article.

21. The method of claim 7, wherein the method includes

a step of removing the at least one first article before constructing the at least one second article;

and

wherein the second build space includes the first build space;

the second build space is larger than the first build space;

the step of applying the free-flowing particulate material and the binder includes;

i) moving the print head and the discharge device together in a first direction; and

then

ii) moving the print head and the discharge device together in a second direction opposite the first direction;

the discharge device is movable in the x, y, and z directions, and

a discharge layer is aligned flush with the topmost layer of the superimposed layers.

22. The method of claim 21, wherein the free-flowing particulate material includes a sand.

23. The method of claim 21, wherein the first build space is enclosed by one or more printed walls including the outer wall, wherein the one or more printed walls enclosing the first build space are generally vertical and free of support by a solid support structure outside of the first build space.