RECONFIGURABLE LEAK TESTING SYSTEM

• US 20130031961A1
• Filed: 08/01/2011
• Published: 02/07/2013
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Holmes, Brian, Nandwani, Sunil, Gulledge, Daniel C., Miller, Michael P.
• Granted Patent: US 8,720,253 B2
• Time in Patent Office: Days
• US Class Current: 73/49.3
• CPC Class Codes: G01M 3/329 for verifying the internal pressure of closed containers

Abstract

A reconfigurable leak testing system includes a leak testing station, an off-shuttle disposed adjacent to the leak testing station, and a fixture cartridge that is translatable between the off-shuttle and the leak testing station. The fixture cartridge is configured to selectively couple with the leak testing station and includes an upper fixture, a lower fixture, and a plurality of actuatable testing features. The fixture cartridge is configured to receive a part between the upper fixture and lower fixture, and the plurality of actuatable testing features are configured to contact the received part to create a closed volume adjacent the part, wherein the closed volume may be pressurized via a pressurized fluid, and examined for leaks.

Claims

1. A reconfigurable leak testing system comprising:

a leak testing station;

an off-shuttle disposed adjacent to the leak testing station; and

a fixture cartridge translatable between the off-shuttle and the leak testing station, the fixture cartridge configured to selectively couple with the leak testing station and including an upper fixture, a lower fixture, and a plurality of actuatable testing features;

wherein the fixture cartridge is configured to receive a part between the upper fixture and lower fixture; and

wherein each of the plurality of actuatable testing features is respectively configured to contact the received part, and wherein the plurality of actuatable testing features and the part partially define a closed volume adjacent the part.

2. The reconfigurable leak testing system of claim 1, wherein the leak testing station includes an actuator, and a fixture interface coupled with the actuator, the fixture interface including a plurality of interlocks configured to selectively couple with the upper fixture of the fixture cartridge;

and the actuator configured to selectively raise and lower the fixture interface.

3. The reconfigurable leak testing system of claim 2, wherein the fixture interface further includes a connection panel configured to couple with the upper fixture, the connection panel including an electrical connector and a fluid connector;

and

wherein the electrical connector provides an electrical connection between the leak testing station and the fixture cartridge, and wherein the fluid connector provides a pneumatic or hydraulic fluid connection between the leak testing station and the fixture cartridge.

4. The reconfigurable leak testing system of claim 3, further comprising a controller configured to control the actuation of the plurality of testing features.

5. The reconfigurable leak testing system of claim 4, wherein the controller is further configured to pressurize the closed volume by providing a pressurized fluid to the volume.

6. The reconfigurable leak testing system of claim 5, wherein the controller is configured to detect a leak in the volume by monitoring the pressure of the pressurized volume and detecting any pressure deviations from an expected pressure.

7. The reconfigurable leak testing system of claim 5, wherein the controller is configured to detect a leak in the volume by monitoring the total mass-flow of the pressurized fluid provided to the volume, and by comparing the monitored mass-flow to an expected total mass-flow.

8. The reconfigurable leak testing system of claim 1, further comprising an automated conveyor system configured to controllably translate the fixture cartridge between the off-shuttle and the leak testing station.

9. The leak testing system of claim 1, wherein the plurality of actuatable testing features include an extendable seal or extendable clamp.

10. A method of leak testing a part using a reconfigurable leak testing system comprising:

selecting a fixture cartridge to receive the part, the fixture cartridge including a separatable upper fixture and lower fixture;

loading the fixture cartridge into a leak testing station;

receiving the part between the upper and lower fixtures;

establishing a closed volume on one side of the part;

pressurizing the closed volume using a pressurized fluid; and

monitoring the pressurized fluid to detect fluid leakage.

11. The method of claim 10, wherein loading the fixture cartridge into the leak testing station includes translating the fixture cartridge from an off-shuttle to the leak testing station;

and

coupling a fixture interface of the leak testing station to the upper fixture of the fixture cartridge.

12. The method of claim 11, wherein coupling a fixture interface to the upper fixture includes selectively coupling a plurality of interlocks on the fixture interface to respective connection elements on the upper fixture.

13. The method of claim 11, wherein translating the fixture cartridge from an off-shuttle to the leak testing station includes controllably translating the fixture cartridge using an automatic conveyor system at the direction of a controller.

14. The method of claim 11, further comprising testing for the existence of a fluid leak between the fixture interface and the upper fixture.

15. The method of claim 10, wherein receiving the part between the upper and lower fixtures includes separating the upper fixture from the lower fixture, and receiving the part on the lower fixture.

16. The method of claim 15, wherein establishing a closed volume on one side of the part includes clamping the part to the lower fixture, and sealing an opening in the part.

17. The method of claim 16, wherein sealing an opening in the part includes contacting the part with a selectively extendable plunger disposed on the upper fixture.

18. The method of claim 10, wherein monitoring the pressurized fluid to detect fluid leakage includes monitoring the pressure of the pressurized volume;

comparing the monitored pressure to an expected pressure; and

indicating fluid leakage if the monitored pressure deviates from the expected pressure.

19. The method of claim 10, wherein monitoring the pressurized fluid to detect fluid leakage includes monitoring the total mass-flow of the pressurized fluid into the closed volume;

comparing the monitored total mass-flow to an expected total mass-flow; and

indicating fluid leakage if the monitored total mass-flow deviates from the expected total mass-flow.

20. A method of leak testing a part comprising:

selecting a fixture cartridge to receive the part, the fixture cartridge including a separatable upper fixture and lower fixture;

loading the fixture cartridge into a leak testing station by controllably translating the fixture cartridge from an off-shuttle to the leak testing station using an automatic conveyor system; and

coupling a fixture interface of the leak testing station to the upper fixture of the fixture cartridge;

receiving the part between the upper and lower fixtures by separating the upper fixture from the lower fixture, and receiving the part on the lower fixture;

establishing a closed volume on one side of the part by clamping the part to the lower fixture, and sealing an opening in the part using an extendable plunger disposed on the upper fixture;

pressurizing the closed volume using a pressurized fluid; and

monitoring the pressurized fluid to detect fluid leakage by comparing a sensed parameter of the monitored pressurized fluid to an expected parameter.