System and method for machining elongate members

• US 7,654,379 B2
• Filed: 06/05/2007
• Issued: 02/02/2010
• Est. Priority Date: 06/16/2004
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Turner, legal representative, Proulx, Mark P., Turner, C. Warren, Boberg, Mark C., Schlosstein, Hugh R.
• Primary Examiner(s): Crawford; Gene
• Assistant Examiner(s): SINGH, KAVEL
• Application Number:
  US11/758,281
• Publication Number:
  US 20080035448A1
• Time in Patent Office: 973 Days
• Field of Search: 198/341.08, 198/345.1, 198/346, 198/346.2
• US Class Current: 198/341.08
• CPC Class Codes: B23C 2215/04 Aircraft components
• CPC Class Codes: B23C 3/002 Milling elongated workpieces
• CPC Class Codes: B23Q 39/02 the sub-assemblies being capable of being brought to act at a single operating station
• CPC Class Codes: B23Q 7/1405 with a series disposition of similar working devices
• CPC Class Codes: B23Q 7/1426 with work holders not rigidly fixed to the transport devices B23Q7/005, B23Q7/035 take precedence

Abstract

A system and method for machining an elongate workpiece in a plurality of work cells are provided. The work cells are positioned along a substantially linear process flow path so that the work operations can be performed on different lengthwise portions of the workpiece simultaneously. A transport system advances the workpiece from an infeed system along the process flow path, thereby moving the lengthwise portions of the workpiece successively through the work cells. The transport system includes a plurality of pallets that can be engaged to the workpiece so that the workpiece is supported by the pallets throughout at least part of the machining system.

Claims

1. A machining system for performing a plurality of work operations on an elongate workpiece, the system comprising:

an infeed system configured to receive the workpiece;

a plurality of workcells positioned along a substantially linear process flow path extending from the infeed system such that a distance between any two consecutive workcells along the path is less than the length of the workpiece, each workcell having clamping members for immobilizing and stabilizing the workpiece and having at least one tool for performing at least one work operation on the immobilized workpiece; and

a transport system configured to advance the workpiece from the infeed system along the process flow path, thereby moving a plurality of lengthwise portions of the workpiece successively through the workcells, the transport system including a plurality of pallets structured to be concurrently engaged to respective portions of a single workpiece such that the single workpiece extends across and is concurrently supported by the plurality of pallets, wherein the transport system is configured to advance both the workpiece and the pallets engaged thereto throughout at least a portion of the machining system with the pallets configured to remain engaged with the respective portions of the workpiece during advancement of the workpiece such that the workpiece and the pallets are advanced uniformly,

wherein at least two of the workcells are configured to perform work operations on different lengthwise portions of the workpiece that are engaged by different pallets without having to reposition the workpiece longitudinally in the system, and

wherein the transport system includes a plurality of rollers positioned along the process flow path, the rollers structured to support the pallets and the workpiece such that the pallets and workpiece are configured to be advanced along the process flow path while the pallets remain engaged with the respective portions of the workpiece.

2. A system according to claim 1 wherein the machining system includes at least three workcells configured to machine three different lengthwise portions of the workpiece without having to reposition the workpiece in the system.

3. A system according to claim 1 wherein the transport system includes at least one actuator configured to be selectively engaged and disengaged with the pallets and configured to incrementally advance the workpiece along the process flow path.

4. A system according to claim 1 wherein each of the pallets includes at least one clamp device for engaging a feature of the workpiece such that the workpiece is supported by the pallets and is advanced along the process flow path thereby.

5. A system according to claim 4 wherein each clamp device includes a clamp member configured to be adjusted between first and second positions, the clamp member in the first position being structured to be inserted into a slot defined by the workpiece and adjusted therein to the second position such that the clamp member engages the workpiece.

6. A system according to claim 4 wherein at least one of the workcells is configured to machine the workpiece to remove the feature from the workpiece.

7. A system according to claim 4 wherein at least one of the pallets includes at least one first clamp device for engaging the workpiece and at least one second clamp device for engaging a second workpiece, thereby connecting the workpieces in the machining system.

8. A system according to claim 4, further comprising an alignment mechanism configured to move the clamp device to a desired position in at least one of the workcells.

9. A system according to claim 4 wherein each pallet includes at least two of the clamp devices, at least one of the clamp devices including a damper such that the clamp device is movable relative to the pallet during the work operations to reduce a transmission of kinetic energy from the workpiece through the pallet during the work operations.

10. A system according to claim 1 wherein at least one of the workcells is configured to machine a surface of the workpiece extending in a first plane and at least one of the other workcells is configured to machine a surface of the workpiece extending in a second plane generally perpendicular to the first plane.

11. A system according to claim 1, further comprising an inspection device provided along the flow path and configured to measure at least one dimension of the workpiece.

12. A system according to claim 11, further comprising a controller configured to communicate with the inspection device and adjust at least one system parameter according to the at least one dimension measured by the inspection device.

13. A system according to claim 1, further comprising a position detection device positioned along the flow path and configured to determine the position of the pallets relative to the workpiece.

14. A system according to claim 1 wherein the clamping members of at least one of the workcells are configured to contact and position the pallet, thereby positioning the workpiece in a desired configuration.

15. A system according to claim 14 wherein the clamping members of at least one of the workcells are configured to contact and position the workpiece such that a grip feature of the workpiece is accessible for machining.

16. A system according to claim 1 wherein each pallet includes linking features that extend in opposite longitudinal directions of the pallet such that adjacent pallets are configured to be linked.

17. A system according to claim 1 wherein the transport system is configured to advance the workpiece along a substantially linear process flow path so as to successively move each of the lengthwise portions of the workpiece to the workcells, the workcells being spaced along the flow path at distances shorter than a length of the workpiece.

18. A machining system for performing a plurality of work operations on an elongate workpiece, the system comprising:

an infeed system configured to receive the workpiece;

a plurality of workcells positioned along a substantially linear process flow path extending from the infeed system such that a distance between any two consecutive workcells along the path is less than the length of the workpiece, each workcell having clamping members for immobilizing and stabilizing the workpiece and having at least one tool for performing at least one work operation on the immobilized workpiece; and

a transport system configured to advance the workpiece from the infeed system along the process flow path, thereby moving a plurality of lengthwise portions of the workpiece successively through the workcells, the transport system including a plurality of pallets structured to be engaged to the workpiece such that the workpiece is supported by the pallets throughout at least a portion of the machining system, wherein each of the pallets includes at least one clamp device for engaging a feature of the workpiece such that the workpiece is supported by the pallets and is advanced along the process flow path thereby,

wherein at least two of the workcells are configured to perform work operations on different lengthwise portions of the workpiece without having to reposition the workpiece longitudinally in the system, and wherein at least one clamp device includes a damper such that the clamp device is movable relative to the pallet during the work operations to reduce a transmission of kinetic energy from the workpiece through the pallet during the work operations.

19. A system according to claim 18 wherein each pallet includes linking features that extend in opposite longitudinal directions of the pallet such that adjacent pallets are configured to be linked.