Method and apparatus for adhesive bond curing

• US 8,409,389 B2
• Filed: 12/13/2006
• Issued: 04/02/2013
• Est. Priority Date: 12/13/2006
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Jones, Gary E.
• Primary Examiner(s): Crispino, Richard
• Assistant Examiner(s): DYE, ROBERT C
• Application Number:
  US11/638,188
• Publication Number:
  US 20100224310A1
• Time in Patent Office: 2,302 Days
• Field of Search: 425/403.1, 425/501, 425/502, 425/508, 425/509, 425/110, 425/111, 264/345, 264/347, 264/257, 264/258, 264/259, 156/245, 156/583.1, 156/583.91, 156/172, 416/229.R, 416/230, 416/241.A
• US Class Current: 156/245
• CPC Class Codes: B29C 2035/1658 using gas
• CPC Class Codes: B29C 35/02 Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mouldcold vulcanisation B29C35/18 ; vulcanising tyres, presses therefor B29D30/0601
• CPC Class Codes: B29C 70/46 using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
• CPC Class Codes: B29C 70/74 Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding B29C70/845 takes precedence
• CPC Class Codes: B29C 70/76 Moulding on edges or extremities of the preformed part
• CPC Class Codes: B29C 70/887 locally reinforced, e.g. by fillers filler concentrated near the surface B29C70/64
• CPC Class Codes: B29K 2063/00 Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2707/04 Carbon
• CPC Class Codes: B29L 2031/08 Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
• CPC Class Codes: B29L 2031/082 Blades, e.g. for helicopters
• CPC Class Codes: B32B 37/0046 characterised by constructional aspects of the apparatus
• CPC Class Codes: Y10T 156/1007 Running or continuous length work
• CPC Class Codes: Y10T 156/17 Surface bonding means and/or assemblymeans with work feeding or handling means

Abstract

Portable apparatus for curing a part includes a wheeled frame having sliding part supports that move the part from a loading position to a curing position. A part clamping assembly is slidably mounted on the frame to apply clamping pressure to the part when the part is in the curing position in order to compact the part during a cure cycle. The clamping assembly includes a set of electrically heated shoes that heat the part to a cure temperature. A fan is provided to accelerate cool down the part after curing is complete. The heating and cooling operations are automatically performed by a programmed controller.

Claims

1. A method of curing a laminated resin part comprising:

loading the part onto a support;

sliding the support having the part thereon along a first axis from a part loading position to a part curing position;

assembling a reinforcement layer of resin material and a fitting to a pre-selected portion of the part, the pre-selected portion of the part being less than an entirety of the part;

applying a pressure to the pre-selected portion of the part by moving a pair of clamps along a second axis transverse to the first axis from a standby position to a clamping position in which the clamps engage opposite faces of the pre-selected portion of the part;

heating the pre-selected portion of the part via the clamps to cure the pre-selected portion of the part to bond the reinforcement layer of resin material or the fitting to the part;

cooling the pre-selected portion of the part after the pre-selected portion of the part has been cured via a cooling fan; and

releasing the pressure applied to the pre-selected portion of the part after the pre-selected portion has cooled by moving the clamps from the clamping position to the standby position.

2. The method of claim 1, further comprising:

sliding the support from the part curing position to the part loading position after the pressure applied to the pre-selected portion is released; and

unloading the part from the support.

3. The method of claim 1, further comprising

sensing a temperature of the pre-selected portion of the part;

measuring a time that the pre-selected portion of the part remains heated to at least a cure temperature; and

terminating heating of the pre-selected portion when the time measured is at least a predetermined value indicating that the pre-selected portion of the part has cured.

4. The method of claim 3, further comprising automatically performing, via a controller, heating the pre-selected portion, cooling the pre-selected portion of the part after the pre-selected portion of the part has been cured, and terminating heating of the pre-selected portion.

5. The method of claim 3, wherein cooling the pre-selected portion of the part after the pre-selected portion of the part has cured comprises automatically turning on the cooling fan when heating of the pre-selected portion has been terminated.

6. A method of claim 1, wherein moving the pair of clamps along the second axis comprises manually moving the pair of clamps via a single shaft having right hand threads on one portion of the shaft and left hand threads on another portion of the shaft so that rotation of the shaft in a first direction causes the pair of clamps to move in opposite directions along the second axis.

7. The method of claim 1, further comprising detecting, via a pressure sensor, the pressure applied to the pre-selected portion of the part by the pair of clamps.

8. The method of claim 1, wherein assembling the fitting to the pre-selected portion of the part comprises bonding the fitting to the pre-selected portion of the part via the reinforcement layer of resin material.

9. The method of claim 8, wherein the part is a rotor blade of a helicopter and further comprising attaching the rotor blade to a drive shaft of the helicopter via the fitting bonded to the pre-selected portion of the part.

10. A method comprising:

positioning a material part on a support that is movable relative to a frame along a first axis between a part loading position and a part curing position, the support having a surface that is substantially parallel relative to the first axis;

maintaining the part between an arm and the support, the arm extending from the support in a non-parallel direction relative to the first axis, the support and the arm to prevent movement of the part in a first direction substantially perpendicular relative to the first axis;

sliding the support to the part curing position along the first axis;

assembling a reinforcement layer of resin material or a fitting to a pre-selected portion of the part, the pre-selected portion of the part being less than an entirety of the part; and

clamping opposing faces of the pre-selected portion of the part via opposing clamps movable along a second axis that is transverse relative to the first axis, the clamps having respective clamping surfaces to engage respective ones of the opposing faces of the pre-selected portion, the clamping surfaces being non-parallel relative to the surface of the support.

11. The method of claim 10, further comprising heating the pre-selected portion of the part via the clamps to cure the pre-selected portion of the part.

12. The method of claim 11, further comprising cooling the pre-selected portion of the part after the pre-selected portion has cured.

13. The method of claim 10, wherein positioning the part on the support comprises positioning the part on the support such that the opposing faces of the pre-selected portion of the part are substantially parallel relative to the clamping surfaces of the clamps.

14. The method of claim 10, further comprising maintaining the pre-selected portion of the part in a substantially vertical relationship relative to respective clamping surfaces via the support and the arm.

15. A method comprising:

positioning a part on a support of a frame, the support to slide the part relative to the frame between a loading position and a curing position;

adding a layer of fiber reinforced resin material over a portion of the part;

moving opposing clamps from a standby position to a part clamping position to apply a pressure to the portion of the part having the layer of fiber reinforced resin material; and

heating the portion of the part via the clamps to bond the fiber reinforced resin material to the part when the clamps are in the clamping position.

16. The method of claim 15, further comprising cooling the clamps to cool the part after the layer of fiber reinforced resin material is bonded.

17. The method of claim 16, further comprising moving the clamps to the standby position after the part has cooled.

18. The method of claim 15, further comprising adding a fitting to the portion of the part prior to moving the clamps to the clamping position, wherein heating the portion of the part bonds the fitting to the portion of the part via the fiber reinforced resin material.

19. The method of claim 18, wherein the part comprises a rotor blade and further comprising attaching the rotor blade to a drive shaft of an aircraft via the fitting.

20. The method of claim 15, wherein the layer of fiber reinforced resin material comprises a carbon fiber reinforced epoxy laminated structure.

21. The method of claim 15, wherein the part comprises laminated layers of fiber reinforced resin matrix in which multiple plies of a woven or knitted fabric or tape are layered upon each other.