Methods and systems for debonding substrates

• US 20070144653A1
• Filed: 12/22/2005
• Published: 06/28/2007
• Est. Priority Date: 12/22/2005
• Status: Abandoned Application

• Current Assignee: L-3 Communications Integrated Systems LP (L3Harris Technologies, Inc.)
• Original Assignee: L-3 Communications Integrated Systems LP (L3Harris Technologies, Inc.)
• Inventors: Grant, Chad, Padilla, Kenneth, Threlfall, James
• Application Number:
  US11/316,380
• Publication Number:
  US 20070144653A1
• Time in Patent Office: Days
• US Class Current: 156/64
• CPC Class Codes: B29C 65/10 using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
• CPC Class Codes: B29C 65/103 direct heating both surfaces to be joined
• CPC Class Codes: B29C 65/14 using wave energy , i.e. electromagnetic radiation, or particle radiation using mechanical waves B29C65/06; using ultrasonic waves B29C65/08; pressing means transparent to electromagnetic radiation B29C66/81267
• CPC Class Codes: B29C 65/76 Making non-permanent or releasable joints
• CPC Class Codes: B29C 66/003 Protecting areas of the parts to be joined from overheating B29C66/348, B29C66/8744 take precedence
• CPC Class Codes: B29C 66/1282 comprising at least one overlap joint-segment
• CPC Class Codes: B29C 66/12881 comprising at least two monotone curved joint-segments
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29C 66/836 Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table B29C66/65 takes precedence
• CPC Class Codes: B29C 66/861 Hand-held tools
• CPC Class Codes: B29C 66/91212 involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
• CPC Class Codes: B29C 66/91216 enabling contactless temperature measurements, e.g. using a pyrometer
• CPC Class Codes: B29C 66/91221 of the parts to be joined
• CPC Class Codes: B29C 66/91411 of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
• CPC Class Codes: B29C 66/91431 the temperature being kept constant over time
• CPC Class Codes: B29C 66/91443 following a temperature-time profile B29C65/38 takes precedence
• CPC Class Codes: B29C 66/91641 the heat or the thermal flux being non-constant over time
• CPC Class Codes: B29C 66/961 involving a feedback loop mechanism, e.g. comparison with a desired value
• CPC Class Codes: B29L 2031/3076 Aircrafts blades, propellers B29L2031/08
• CPC Class Codes: Y10T 156/19 Delaminating means

Abstract

Methods and systems for applying heat to substrates that are in contact with an uncured bonding material or that are bonded with one or more sealants or other bonding material/s. Substrates may be heated, for example, so that the substrates may be debonded by degrading one or more mechanical properties of the bonding material/s so that the substrates may be separated. The application of heat to a substrate may be controlled based on the temperature of the substrate during the heating process. Damage-sensitive substrates, such as aircraft substrates, may be heated in a manner that controls surface temperature of the substrates to meet heat treating requirements and/or to limit heating to maximum temperatures for the substrates in a manner that substantially eliminates damage to the substrates during the heating operation while at the same time at least partially curing uncured bonding material, or degrading one or more mechanical properties of cured bonding material/s.

Claims

1. A method of separating two or more aircraft substrates bonded together by a bonding material, said method comprising:

providing a substrate heating system, said substrate heating system comprising a remote heat source, and a remote thermal sensor;

remotely applying heat to at least one of said aircraft substrates, said bonding material or a combination thereof using said remote heat source;

remotely monitoring a temperature of at least one of said aircraft substrates during said application of heat using said remote thermal sensor;

manually or automatically controlling said application of heat based at least in part on said remotely monitored substrate temperature; and

separating at least one of said aircraft substrates from at least one other of said aircraft substrates during or after said application of heat.

2. The method of claim 1, further comprising controlling said application of heat based at least in part on said monitored substrate temperature to at least partially degrade one or more mechanical properties of said bonding material.

3. The method of claim 1, wherein said substrate heating system further comprises a heat source control;

wherein said remote heat source comprises a hot air source;

wherein said remote thermal sensor comprises an infrared sensor; and

wherein said method comprises automatically controlling said application of heat with said heat source control based at least in part on said remotely monitored substrate temperature.

4. The method of claim 3, wherein said heat source, said thermal sensor, and said heat source control are integrated together into a substrate heating system configured as a heat gun.

5. The method of claim 3, wherein said method comprises automatically controlling said remote application of heat with said heat source control based at least in part on said remotely monitored substrate temperature and based at least in part on substrate heating information.

6. The method of claim 5, wherein said substrate heating information comprises a maximum substrate temperature;

and wherein said automatically controlling said application of heat based at least in part on said remotely monitored substrate temperature comprises automatically discontinuing application of said heat when said remotely monitored substrate temperature reaches said maximum substrate temperature.

7. The method of claim 5, wherein said substrate heating information comprises a temperature profile;

and wherein said automatically controlling said remote application of heat comprises automatically varying said application of said heat according to said temperature profile.

8. The method of claim 5, further comprising receiving at least a part of said substrate heating information through a user interface of said substrate heating system.

13. The method of claim 1l, wherein said remotely applying heat comprises applying hot air to at least one of said substrates, said bonding material or a combination thereof;

and wherein said monitoring a temperature of at least one of said substrates comprises monitoring infrared radiation emitted by at least one of said substrates.

9. A method of separating two or more substrates bonded together by a bonding material, said method comprising:

remotely applying heat to at least one of said substrates, said bonding material or a combination thereof;

monitoring a temperature of at least one of said substrates during said application of heat;

controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature; and

separating at least one of said substrates from at least one other of said substrates during or after said application of heat.

10. The method of claim 9, further comprising controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature to at least partially degrade one or more mechanical properties of said bonding material.

11. The method of claim 9, wherein said monitoring a temperature of at least one of said substrates comprises remotely monitoring a temperature of at least one of said substrates during said application of heat.

12. The method of claim 9, wherein said substrates comprise aircraft substrates.

14. The method of claim 11, further comprising controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature and based at least in part on substrate heating information selected based on a material composition of said at least one substrate.

15. The method of claim 14, wherein said substrate heating information comprises a maximum substrate temperature;

and wherein said controlling said application of heat based at least in part on said monitored substrate temperature comprises discontinuing application of said heat when said monitored substrate temperature reaches said maximum substrate temperature.

16. The method of claim 14, wherein said substrate heating information comprises a temperature profile;

and wherein said controlling said application of heat in an automated manner comprises varying said application of said heat according to said temperature profile.

17. The method of claim 14, wherein a heat source of a substrate heating system is used to remotely apply said heat;

wherein a thermal sensor of substrate heating system is used to monitor said substrate temperature; and

wherein a heat source control of said substrate heating system is use to automatically control said application of said heat.

18. The method of claim 17, wherein said heat source, said thermal sensor, and said heat source control are integrated together into a substrate heating system configured as a heat gun.

19. A substrate heating system, comprising:

a heat source configured to remotely apply heat to a substrate;

a thermal sensor; and

a heat source control coupled to said heat source and to said thermal sensor, said heat source control being programmed with two or more different choices of substrate heating information, each of said two or more different choices corresponding to a type of substrate material composition to be heated by application of heat by said heat source of said substrate heating system;

wherein said heat source control is configured to allow a user to select one of said substrate heating information choices;

wherein said heat source control is further configured to automatically control application of heat to a substrate by said heat source based at least in part on temperature of said substrate monitored by said thermal sensor and based at least in part on said programmed substrate heating information selected by a user; and

wherein said heat source comprises a remote heat source, or wherein said thermal sensor comprises a remote thermal sensor, or a combination thereof.

20. The system of claim 19, further comprising a user interface coupled to said heat source control to allow a user to select one of said substrate heating information choices corresponding to said substrate to be heated.

21. The system of claim 20, wherein said remote heat source comprises a hot air source;

and wherein said thermal sensor comprises an infrared sensor.

22. The system of claim 21, wherein said heat source, said thermal sensor, and said heat source control are integrated together into a substrate heating system configured as a heat gun.

23. The system of claim 19, wherein said programmed substrate heating information comprises a maximum substrate temperature;

and wherein said heat source control is configured to automatically discontinue application of said heat to said substrate when said monitored substrate temperature reaches said maximum substrate temperature.

24. The system of claim 19, wherein said programmed substrate heating information comprises a temperature profile;

and wherein said heat source control is configured to automatically vary said remote application of said heat to said substrate according to said temperature profile.

25. A method of heating a substrate bonded to a bonding material, said method comprising:

remotely applying heat to said substrate or said bonding material;

monitoring a temperature of said substrate during said application of heat; and

controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature to at least partially degrade one or more mechanical properties of said bonding material.

26. The method of claim 25, wherein said substrate comprises an aircraft substrate;

wherein said monitoring a temperature of at least one of said substrates comprises remotely monitoring a temperature of at least one of said substrates during said application of heat; and

wherein said method further comprises controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature and based at least in part on substrate heating information selected based on a material composition of said substrate.

27. The method of claim 26, wherein said substrate heating information comprises a maximum substrate temperature;

and wherein said controlling said application of heat based at least in part on said monitored substrate temperature comprises discontinuing application of said heat when said monitored substrate temperature reaches said maximum substrate temperature.

28. The method of claim 26, wherein said substrate heating information comprises a temperature profile;

and wherein said controlling said application of heat comprises varying said application of said heat according to said temperature profile.

29. The method of claim 26, wherein said remotely applying heat comprises applying hot air from a heat source of a substrate heating system to said substrate or said bonding material;

wherein an infrared thermal sensor of said substrate heating system is used to monitor said substrate temperature;

wherein a heat source control of said substrate heating system is use to automatically control said application of said heat; and

wherein said substrate heating system comprises a heat gun.

30. A method of heating a substrate in contact with a bonding material, said method comprising:

applying heat to said substrate or said bonding material;

remotely monitoring a temperature of said substrate during said application of heat; and

wherein said bonding material is a cured bonding material in contact with said substrate and said method comprises controlling said application of heat based at least in part on said monitored substrate temperature to at least partially degrade one or more mechanical properties of said cured bonding material, or

wherein said bonding material is an uncured bonding material in contact with said substrate and said method comprises controlling said application of heat based at least in part on said monitored substrate temperature to at least partially cure said uncured bonding material.

31. The method of claim 30, wherein said substrate comprises an aircraft substrate;

and wherein said method further comprises controlling said application of heat in an automated manner based at least in part on said monitored substrate temperature and based at least in part on substrate heating information selected based on a material composition of said substrate.

32. The method of claim 31, wherein said substrate heating information comprises a maximum substrate temperature;

and wherein said controlling said application of heat based at least in part on said monitored substrate temperature comprises discontinuing application of said heat when said monitored substrate temperature reaches said maximum substrate temperature.

33. The method of claim 31, wherein said substrate heating information comprises a temperature profile;

and wherein said controlling said application of heat comprises varying said application of said heat according to said temperature profile.

34. The method of claim 31, wherein said applying heat comprises remotely applying heat to said substrate or said bonding material.

35. The method of claim 34, wherein said remotely applying heat comprises applying hot air from a heat source of a substrate heating system to said substrate or said bonding material;

wherein an infrared thermal sensor of said substrate heating system is used to monitor said substrate temperature;

wherein a heat source control of said substrate heating system is use to automatically control said application of said heat; and

wherein said substrate heating system comprises a heat gun.