System and method for rotational 3D printing
An apparatus for fabricating a three-dimensional object from a representation of the object stored in memory. The apparatus includes a drum supported for rotation. A build platform is supported for linear movement within the drum from a first position adjacent a first end of the drum to a second position within the drum. The build platform is rotationally fixed relative to the drum such that the build platform rotates with the drum. A powder feed hopper is fixed at a position above a first portion of the build platform. At least one directed energy source is positioned above the build platform and is configured to apply directed energy to a majority of the remaining portion of the build platform excluding the first portion.
1. An apparatus for fabricating a three-dimensional object as a series of printed layers from a representation of the object stored in memory, the apparatus comprising:
a drum supported for rotation about a central axis;
a build platform coaxial with and supported for linear movement within the drum from a first position adjacent a first end of the drum to a second position within the drum, the build platform defining a circumference and rotationally fixed relative to the drum such that the build platform rotates with the drum;
a powder feed hopper at a fixed position above a first portion of the build platform configured to provide a continuous printing layer of powder wherein the powder feed hopper extends radially from the build platform circumference inwardly such that the central axis passes through a portion of the powder feed hopper; and
at least one directed energy source is positioned above the build platform, the at least one directed energy source is configured to apply directed energy to a majority of the remaining portion of the build platform.
2. The apparatus according to claim 1 including a plurality of directed energy sources with each of the directed energy sources at a fixed location and configured to apply directed energy to a portion of the build platform excluding the first portion.
3. The apparatus according to claim 1 wherein the at least one directed energy source is mounted for movement relative to the build platform such that the at least one directed energy source may be positioned above a majority of the build platform.
4. The apparatus according to claim 3 wherein the at least one directed energy source is mounted for movement along a rail.
5. The apparatus according to claim 3 wherein the at least one directed energy source is mounted for movement via a robotic arm.
6. The apparatus according to claim 1 wherein the at least one directed energy source is a laser.
7. The apparatus according to claim 1 wherein the at least one directed energy source is an electron beam gun.
8. The apparatus according to claim 1 wherein a screw drive is secured within the drum such that it rotates therewith and a screw shaft extends between the screw drive and the build platform, the screw shaft fixed against rotation relative to the screw drive.
9. The apparatus according to claim 1 wherein rotation of the screw drive causes linear motion of the build platform.
10. The apparatus according to claim 9 wherein a drum motor causes rotation of the drum and wherein the drum motor and the screw drive are independently operable.
11. The apparatus according to claim 1 wherein the build platform is manufactured from a gas permeable material which allows gases to pass therethrough but not powder supported on the build platform.
12. The apparatus according to claim 11 wherein the build platform is manufactured from an ultra filtration ceramic membrane.
13. The apparatus according to claim 11 wherein a vacuum force is applied within the drum and pulls smoke and heat through the build platform.
14. The apparatus according to claim 1 wherein the powder feed hopper and the at least one directed energy source are positioned within a build chamber.
15. The apparatus according to claim 14 wherein the build chamber is sealed to be air-tight.
16. The apparatus according to claim 14 wherein each of the at least one directed energy sources has an extended cone extending therefrom to a height slightly spaced from an initial location of the build platform, each extended cone defining a respective gas chamber.
17. The apparatus according to claim 1 wherein a slide mechanism is moveable along the powder feed hopper, the slide mechanism connected with a powder feed tube and configured to move the powder feed tube along the powder feed hopper to evenly distribute powder within the powder feed hopper.
18. The apparatus according to claim 1 wherein at least one heating element extends above at least a portion of the build platform.
19. The apparatus according to claim 18 wherein the at least one heating element is an electronic heating bar, an infrared heating bar or an induction heating bar.
20. The apparatus according to claim 1 wherein the drum is supported on and removable from a rotatable platform.