Precision non-contact polishing tool

• US 5,591,068 A
• Filed: 03/13/1995
• Issued: 01/07/1997
• Est. Priority Date: 03/13/1995
• Status: Expired due to Term

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Taylor, John S.
• Primary Examiner(s): Eley, Timothy V.
• Application Number:
  US08/403,035
• Time in Patent Office: 666 Days
• Field of Search: 451/36, 451/40, 451/41, 451/42, 451/102, 451/104, 451/108, 451/111, 451/112, 451/113, 451/115, 451/527
• US Class Current: 451/104
• CPC Class Codes: B24B 13/00 Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor edging optical work, e.g. lenses, prisms B24B9/14
• CPC Class Codes: B24B 31/00 Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor abrasive blasting machines B24C3/26
• CPC Class Codes: B24B 31/112 using magnetically consolidated grinding powder, moved relatively to the workpiece under the influence of pressure

Abstract

A non-contact polishing tool that combines two orthogonal slurry flow geometries to provide flexibility in altering the shape of the removal footprint. By varying the relative contributions of the two flow geometries, the footprint shape can be varied between the characteristic shapes corresponding to the two independent flow regimes. In addition, the tool can include a pressure activated means by which the shape of the brim of the tool can be varied. The tool can be utilized in various applications, such as x-ray optical surfaces, x-ray lithography, lenses, etc., where stringent shape and finish tolerances are required.

Claims

1. A non-contact polishing tool, comprising:

a brim;

a shaft connected to said brim and having an opening therein;

means for directing a slurry through said opening in said shaft;

means for rotating at least said brim; and

means for changing at least the shape of an outer periphery of said brim;

whereby a slurry is adapted to flow through said opening in said shaft and onto an associated surface to be polished.

2. The non-contact polishing tool of claim 1, wherein said brim is provided with a roughened lower surface.

3. The non-contact polishing tool of claim 1, additionally including a plurality of radially extending grooves on a lower surface of said brim, and wherein the slurry is adapted to flow through said grooves and onto an associated surface to be polished.

4. The non-contact polishing tool of claim 1, wherein said means for changing the shape of said brim comprises a pressure activated assembly.

5. The non-contact polishing tool of claim 4, wherein said pressure activated assembly, includes a flexible member secured to said brim and means for connecting said flexible member to a controlled pressure supply.

6. The non-contact polishing tool of claim 5, wherein said flexible member is composed of a canopy having a bellows therein, said canopy being secured to said brim and fluid sealed with respect to said shaft by means which allows rotation of said shaft.

7. The non-contact polishing tool of claim 1, wherein said brim is constructed of flexible material selected from the group consisting of metal, plastic, and fiber-reinforced composite material.

8. The non-contact polishing tool of claim 1, wherein said opening in said shaft defines an axially extending orifice there through.

9. The non-contact polishing tool of claim 8, wherein said means for changing the shape of said brim includes a pressure activated assembly for deflecting at least the outer periphery of said brim.

10. A precision non-contact polishing tool having an adjustable removal footprint geometry, comprising:

a brim having a non-continuous bottom surface thereof;

a shaft connected to the brim and having an axially extending opening therein, and in fluid communication with said grooves in said brim;

means for rotating the shaft and brim; and

means for deflecting at least an outer portion of said brim, for adjusting the removal footprint geometry of the brim.

11. The polishing tool of claim 10, wherein at least said brim is constructed of a flexible material.

12. The polishing tool of claim 10, wherein said means for deflecting at least an outer portion of said brim includes a controlled pressure activated assembly.

13. The polishing tool of claim 12, wherein said controlled pressure activated assembly includes a member secured to said brim and fluid sealed about said shaft, and means for connecting an interior of said member with a controlled pressure source.

14. The polishing tool of claim 13, wherein said member comprises a canopy having a flexible section therein.

15. The polishing tool of claim 10, additionally including means for directing a slurry through said axially extending opening in said shaft onto an associated surface to be polished adapted to be positioned in spaced relation to said bottom surface of said brim, directing the slurry into the non-continuous surface on said brim and onto an associated surface to be polished;

whereby stagnation flow and azimuthal flow of the slurry is produced for removing material from an associated surface.

16. The polishing tool of claim 15, wherein said non-continuous surface is selected from a roughened surface and radially extending grooves.

17. The polishing tool of claim 10, additionally including means to enable orbital motion thereof.