Tuned damped absorber support

• US 6,719,503 B1
• Filed: 09/07/2001
• Issued: 04/13/2004
• Est. Priority Date: 09/07/2001
• Status: Expired due to Fees

• Current Assignee: Fives Machining Systems, Inc.
• Original Assignee: Unova IP Corp.
• Inventors: McCalmont, Paul E., Burt, Dennis A., Loretta, Miles E., Kohring, Mark D.
• Primary Examiner(s): Howell, Daniel W.
• Application Number:
  US09/948,728
• Time in Patent Office: 949 Days
• Field of Search: 409/141, 409/235, 408/234, 188/268, 188/378, 188/379, 188/380, 267/137, 267/140.5
• US Class Current: 409/141
• CPC Class Codes: B23Q 11/0035 by adding or adjusting a mass, e.g. counterweights
• CPC Class Codes: B23Q 11/0039 by changing the natural frequency of the system or by continuously changing the frequency of the force which causes the vibration
• CPC Class Codes: B23Q 17/0976 Detection or control of chatter B23Q15/12 takes precedence
• CPC Class Codes: F16F 7/104 the inertia member being resiliently mounted F16F7/1022 takes precedence
• CPC Class Codes: Y10T 409/304312 with means to dampen vibration
• CPC Class Codes: Y10T 409/309576 Machine frame

Abstract

With high speed machine tools, there is a desire to dampen vibrations and to retain the damper mass in proper position. The present invention relates to a tuned damped absorber support providing simultaneous energy dissipation in both horizontal and vertical directions which also provides for proper mass position retention. The tuned damped absorber assembly is attached directly or indirectly to a machine component requiring damping. Both single damper mass and double damper mass configurations are shown. With a double damper mass, the system can be tuned to two different frequencies. Therefore, the double damper mass provides for optimization in both a vertical and a horizontal direction.

Claims

1. An attachment assembly for dissipating energy of a moving machining component in at least two directions of motion, comprising:

at least one damper mass;

at least one first preload assembly, each said first preload assembly having a first end coupled to said damper mass by a biasing element and a second end coupled to said machine component;

at least one rod for mounting said at least one damper mass to the machine component and for applying a preload to said at least one first preload assembly; and

,

at least one first damping element.

2. The attachment assembly of claim 1, wherein:

said at least one damper mass includes at least one preload bore therethrough;

said at least one first preload assembly includes a cap screw having a cap end and a threaded end opposite said cap end;

said at least one first preload assembly includes a retainer for coupling said biasing element to said cap end of said cap screw; and

wherein

said cap end of said cap screw is coupled to said damper mass by said biasing element, and said threaded end extends at least partway through said at least one preload bore and is coupled to said machine component.

3. The attachment assembly of claim 1, wherein said attachment assembly attenuates vibration of said machine component.

4. The attachment assembly of claim 1, wherein said at least two directions of motion includes a first direction along a horizontal axis and a second direction along a vertical axis.

5. The attachment assembly of claim 1, wherein said biasing element is a spring.

6. The attachment assembly of claim 1, wherein said at least one first damping element is constructed from a viscoelastic material.

7. The attachment assembly of claim 1, wherein said at least one damper mass is mounted to said machine component by a mounting plate.

8. The attachment assembly of claim 1, wherein said at least one first damping element is positioned between said at least one damper mass and said machine component.

9. The attachment assembly of claim 1, wherein said at least one rod includes a symmetric cross-section.

10. The attachment assembly of claim 1, wherein said at least one rod includes a first stiffness oriented along a first axis and a second stiffness oriented along a second axis.

11. The attachment assembly of claim 10, wherein said at least one rod includes a non-symmetric cross-section.

12. The attachment assembly of claim 1, wherein said at least one damper mass includes a first damper mass and a second damper mass.

13. The attachment assembly of claim 12, wherein said first damper mass is affixed to said second damper mass by at least one flexure plate.

14. The attachment assembly of claim 12, further comprising at least one second preload assembly, each of said at least one second preload assembly having a first end coupled to said first damper mass by a biasing element and a second end coupled to said second damper mass.

15. The attachment assembly of claim 12, further comprising at least one second damping element.

16. The attachment assembly of claim 15, wherein said at least one second damping element is positioned between said first damper mass and said second damper mass.

17. The attachment assembly of claim 1, wherein said at least one damper mass includes a rod bore extending through said damper mass and having a bushing receiving portion at a first end thereof and a rod receiving portion at a second end thereof, a lock nut end of said rod being coupled to said bushing receiving portion of said rod bore by a bushing, wherein a component end of said rod opposite said lock nut end extending at least partway through said rod receiving portion of said rod bore, and wherein said component end of said rod is coupled to said machine component.