SINGLE-SIDED MAGNETIC FIXTURING SYSTEMS

• US 20090283946A1
• Filed: 05/19/2008
• Published: 11/19/2009
• Est. Priority Date: 05/19/2008
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Cai, Wayne W., Shen, Chi-Hung
• Application Number:
  US12/123,236
• Publication Number:
  US 20090283946A1
• Time in Patent Office: Days
• US Class Current: 269/8
• CPC Class Codes: B25B 11/002 Magnetic work holders

Abstract

A combination useful for providing a clamping force to a workpiece during a manufacturing operation so as to maintain a workpiece in a stationary position includes a workpiece having a first side and a second side, a magnet disposed about a portion of the first side of the workpiece, and a pressure pad disposed about a portion of the second side of the workpiece. The pressure pad may include one or more of permanently magnetic materials and ferromagnetic materials, and disposed in sufficient proximity with respect to the magnet to enable the pressure pad to be attracted by the magnet, thus providing a clamping force on the workpiece.

Claims

1. A combination useful for providing a clamping force to a workpiece during a manufacturing operation so as to maintain said workpiece in a stationary position, said combination comprising:

a workpiece having a first side and a second side;

a magnet disposed about a portion of said first side of said workpiece; and

a pressure pad disposed about a portion of said second side of said workpiece, said pressure pad comprising one or more of permanently magnetic materials and ferromagnetic materials;

wherein said pressure pad is disposed in sufficient proximity with respect to said magnet to enable said pressure pad to be attracted by said magnet, thus providing a clamping force on said workpiece.

2. A combination according to claim 1 wherein said magnet comprises one or more of electromagnets and permanent magnets.

3. A combination according to claim 1 wherein said workpiece comprises a ferromagnetic material.

4. A combination according to claim 1, further comprising:

an adhesive material disposed between and in contact with both of said pressure pad and said workpiece.

5. A combination according to claim 4 wherein said adhesive material comprises a two-sided tape having a front and rear face, with an adhesive disposed on both of said faces.

6. A combination according to claim 4 wherein said workpiece comprises a non-ferromagnetic material.

7. A combination according to claim 1 wherein said magnet is attached to a substrate selected from the group consisting of:

a floor, a machine, a wall, a ceiling, a boom, an extension arm, a framework, and a robot.

8. A combination according to claim 1 wherein said pressure pad comprises a permanently magnetic material and further comprising a solid mass of a ferromagnetic substance in effective magnetic contact with a portion of said permanently magnetic material that is not in contact with said workpiece.

9. A combination according to claim 1 wherein said pressure pad comprises particles of a permanently magnetic material disposed in a bag.

10. A combination according to claim 9 further comprising a solid mass of a ferromagnetic substance in effective magnetic contact with a portion of said bag that is not in contact with said workpiece.

11. A combination according to claim 1 wherein said pressure pad comprises a solid mass of a ferromagnetic material and wherein an adhesive is disposed between said pressure pad and said workpiece.

12. A combination according to claim 1 wherein said pressure pad comprises particles of a ferromagnetic material disposed in a bag, and wherein an adhesive is disposed between said pressure pad and said workpiece.

13. A system for maintaining a workpiece in a stationary position, which system comprises a plurality of magnet/pressure pad clamping combinations as specified in claim 1, all operating on a single workpiece to maintain the workpiece in a stable position.

14. A system according to claim 13 wherein the magnets in said combinations comprise electromagnets, and further comprising:

a source of direct current electricity;

electrical conductors disposed between said source of direct current electricity and at least one of said electromagnets sufficient to provide an electrical circuit;

a microprocessor; and

at least one microprocessor-controlled switch signally coupled to said microprocessor and present in said electrical circuit, said at least one switch being disposed between said source of direct current electricity and one or more of said electromagnets.

15. A process for holding a workpiece that is to be subject to a manufacturing operation in a stable position comprising:

providing a workpiece having a first side and a second side;

providing a magnet disposed about a portion of the first side of the workpiece; and

providing a pressure pad disposed about a portion of the second side of the workpiece, said pressure pad comprising one or more of permanently magnetic materials and ferromagnetic materials;

wherein said pressure pad is caused to be disposed in sufficient proximity with respect to said magnet to enable the pressure pad to be attracted by the magnet sufficiently to provide an effective amount of clamping force on said workpiece for preventing substantial movement of said workpiece.

16. A process according to claim 15 further comprising:

removing said pressure pad from said workpiece.

17. A process according to claim 15 wherein said magnet comprises one or more of electromagnets and permanent magnets.

18. A process according to claim 15 wherein said pressure pad comprises a permanently magnetic material in a form of one or more of particles of a permanently magnetic material disposed in a bag, and a solid mass of a permanently magnetic material.

19. A process according to claim 15 wherein said pressure pad comprises a ferromagnetic material in a form of one or more of particles of a ferromagnetic material disposed in a bag, and a solid mass of a ferromagnetic material.

20. A process according to claim 19 wherein said pressure pad has an outer surface which comprises a layer of an adhesive material disposed thereon.