Surface equalization apparatus
A surface equalization apparatus designed to be compatible with a wide variety of part technologies, composite materials and part geometries. The apparatus works with software, chemistry, abrasives and media and includes an oblong, elongated input tank for holding media and a part. The input tank is connected to a motor mount, which is connected to an eccentric motor. When the motor is activated, the input tank begins to move in a vibrational, sinusoidal manner. The motion of the tank on attached springs generates a rotational flow of media in the tank. This creates a low amplitude/high frequency movement of the part through the tank. Surface structures divert media to prevent the part from contacting the side of the tank. Spray nozzles are positioned above the input tank. Acoustic damping foam is positioned around the central components. A cooling fan allows airflow through the apparatus.
1. A method of surface smoothing an additively manufactured part, comprising:
providing a part-containing tank having an oblong shape, wherein the part-containing tank is mounted upon springs surrounded by a top portion of the part-containing tank;
filling the part-containing tank with a fluidized solid media;
powering an eccentric motor which is connected to the part-containing tank at an applied angle offset from a vertical axis of the tank and imparts motion to the part-containing tank at the applied angle offset from the vertical axis of the tank to create a rotational flow of the fluidized solid media within the part-containing tank;
placing the additively manufactured part in the part-containing tank;
carrying the additively manufactured part in the fluidized solid media so that the additively manufactured part moves in a submerged, and circuitous motion within the part-containing tank wherein a surface of the additively manufactured part is smoothed; and
directing the rotational flow of the fluidized solid media to prevent the additively manufactured part from contacting the part-containing tank and from reaching a surface of the fluidized solid media.
2. The method of claim 1 wherein the directing is by means of structural features that comprise at least one diverter located on and jutting inward from an inner surface of the part-containing tank.
3. The method of claim 1 , further comprising adjusting a frequency of the motion generated on the part-containing tank.
4. The method of claim 1 , further comprising acoustically damping sound generated.
5. The method of claim 1 , further comprising adding additional fluidized solid media to the tank.
6. The method of claim 1 , wherein the step of directing the rotational flow of the fluidized solid media to prevent the additively manufactured part from contacting the part-containing tank and from reaching a surface of the fluidized solid media is performed by means of guide ribs that extend along an inner side of the part-containing tank and create an inward force toward a center of the part-containing tank thereby preventing the additively manufactured part from contacting a surface of the part-containing tank.
7. The method of claim 1 wherein the motion on the part-containing tank has an amplitude of between 1 and 3 millimeters.
8. The method of claim 1 wherein the motion on the part-containing tank has a frequency of between 1200 and 1600 rpm.
9. The method of claim 1 wherein the motion on the part-containing tank has a frequency of between 900 and 4500 rpm.
10. The method of claim 1 further comprising, dampening noise caused by the part-containing tank.
11. The method of claim 1 wherein the motion on the part-containing tank is a rotational motion which causes the fluidized solid media in the part-containing tank to flow rotationally in an opposite direction.
12. The method of claim 1 wherein the fluidized solid media has a density of between 20 pounds per cubic foot and 90 pounds per cubic foot.
13. The method of claim 7 wherein the motion on the part-containing tank has a frequency of between 1200 and 1600 rpm.
14. A method of smoothing a part made by an additive manufacturing process comprising:
causing a fluidized solid media in a tank to flow rotationally about a horizontal axis, wherein the tank is suspended from springs surrounded by a top portion of the part-containing tank and aligned to a metacentric height; and
submersing the part made by the additive manufacturing process in the fluidized solid media in the tank so that the part made by the additive manufacturing process is carried in the fluidized solid media as the fluidized solid media flows rotationally in the tank so that the part made by the additive manufacturing process moves in a submerged, circuitous motion in the fluidized solid media in the tank; and
directing flow of the fluidized solid media in the tank at a crest thereof by means of an abrasive diverter so that there is fluid movement around the part made by the additive manufacturing process thereby to maintain the part made by the additive manufacturing process underneath a surface of the fluidized solid media,
wherein a surface of the part made by the additive manufacturing process is smoothed by abrasion by the fluidized solid media.
15. The method of claim 14 further comprising creating a force on the fluidized solid media toward a center of the tank to prevent the part made by the additive manufacturing process from contacting the tank.
16. The method of claim 14 wherein the fluidized solid media is caused to flow rotationally in the tank by application of a vibratory motion to the tank.
17. The method of claim 14 wherein a surface of the fluidized solid media forms an angle during operation.
18. The method of claim 17 wherein the angle has a relationship to at least one of: a motor force, a media volume, a media mass, and a cycle time.