Induction coil, method and device for inductive heating of metallic components

• US 20090127254A1
• Filed: 11/13/2008
• Published: 05/21/2009
• Est. Priority Date: 11/16/2007
• Status: Abandoned Application

• Current Assignee: MTU Aero Engines GmbH (MTU)
• Original Assignee: MTU Aero Engines GmbH (MTU)
• Inventors: Zenzinger, Guenter, Gindorf, Alexander, Bamberg, Joachim, Hanrieder, Herbert
• Application Number:
  US12/291,737
• Publication Number:
  US 20090127254A1
• Time in Patent Office: Days
• US Class Current: 219/672
• CPC Class Codes: H05B 6/101 for local heating of metal pieces
• CPC Class Codes: H05B 6/36 Coil arrangements
• CPC Class Codes: H05B 6/40 Establishing desired heat distribution, e.g. to heat particular parts of workpieces

Abstract

An induction coil for inductive heating of at least one metallic component having at least one lateral face and at least one face to be heated is provided. The induction coil includes a meandering pattern section shaped around the at least one component in such a way that the section extends over at least a partial area of the at least one lateral face of the at least one component to be heated in the area of the at least one face to be heated. A device and method for inductive heating of at least one metallic component are also provided.

Claims

1. An induction coil for inductive heating of at least one metallic component having at least one lateral face and at least one face to be heated, the induction coil comprising:

a meandering pattern section shaped around the at least one component in such a way that the section extends over at least a partial area of the at least one lateral face of the at least one component to be heated in the area of the at least one face to be heated.

2. The induction coil as recited in claim 1 wherein the at least one induction coil has a three-dimensional design that is adapted to the geometry of the at least one component.

3. The induction coil as recited in claim 1 wherein the at least one lateral face includes a lateral face on a top side of the at least one component and a lateral face on a bottom side of the at least one component, the meandering pattern being arranged in such a way so as to produce a current on the at least one face to be heated, the current flowing perpendicular to areas of the lateral face on the top side and the lateral face on the bottom side that are parallel.

4. The induction coil as recited in claim 1 wherein the at least one component includes a first component and a second component and the at least one face to be heated includes a first joining face of the first component and a second joining face of the second component, the meandering pattern section being shaped around the first and second components such that the meandering pattern section is capable of joining the first joining face and the second joining face.

5. The induction coil as recited in claim 1 further comprising at least one cooling device for cooling the meandering pattern section.

6. The induction coil as recited in claim 1 wherein the at least one component includes a first component and a second component, the meandering pattern section being adapted for an inductive low-frequency or high-frequency pressure welding capable of joining the first component and the second component.

7. The induction coil as recited in claim 6 wherein the meandering pattern section is adapted to join the first component and the second component by inductive low-frequency or high-frequency pressure welding between frequencies of 0.05 and 2.5 MHz.

8. The induction coil as recited in claim 1 wherein the at least one component is at least one component of a gas turbine.

9. A method for inductive heating of at least one metallic component having at least one lateral face and at least one face to be heated, the method comprising:

providing at least one induction coil having a meandering form and operating in working range;

arranging the at least one component and the at least one induction coil so that the least one induction coil is shaped around the at least one component, the at least one induction coil extending over at least a partial area of the at least one lateral face of the at least one component in an area of the at least one face to be heated; and

inductive heating the at least one component in the working range of the at least one induction coil.

10. The method as recited in claim 9 wherein the at least one induction coil has a three-dimensional design that is adapted to the geometry of the at least one component.

11. The method as recited in claim 9 wherein the at least one lateral face includes a lateral face on a top side of the at least one component and a lateral face on a bottom side of the at least one component, the induction coil being arranged in such a way that during the inductive heating step a current is produced on the at least one face to be heated that flows perpendicularly to areas of the lateral face on the top side and the lateral face on the bottom side that are parallel.

12. The method as recited in claim 9 wherein the at least one component includes a first component and a second component, the inductive heating step being an inductive low-frequency or high-frequency pressure welding for joining the first component and the second component.

13. The method as recited in claim 12 wherein the frequencies used in the inductive low-frequency or the high-frequency pressure welding are selected from a range between 0.05 and 2.5 MHz.

14. The method as recited in claim 9 wherein the at least one component includes a first component and a second component, the inductive heating step being inductive soldering for joining the first component and the second component.

15. The method as recited in claim 9 wherein the inductive heating step eliminates inherent stresses in the at least one component.

16. The method as recited in claim 9 wherein the at least one component includes a first component and a second component, the first component being a blade or a component of a blade of a rotor in a gas turbine and the second component being a ring or a disk of the rotor or a blade foot situated on the circumference of the ring or the disk.

17. The method as recited in claim 9 wherein the at least one component is a component of a blade of a rotor in a gas turbine.

18. A device for inductive heating of at least one metallic component having at least one lateral face and at least one face to be heated, the device comprising:

at least one generator; and

at least one induction coil, the at least one induction coil having a meandering pattern and being shaped around the at least one metallic component such that the at least one induction coil extends over at least a partial area of the at least one lateral face of the at least one component in an area of the at least one face to be heated.

19. The device as recited in claim 18 wherein the at least one induction coil has a three-dimensional design that is adapted to the geometry of the at least one component.

20. The device as recited in claim 18 wherein the at least one lateral face includes a lateral face on a top side of the at least one component and a lateral face on a bottom side of the at least one component, the induction coil being arranged in such a way that the induction coil produces a current on the at least one face to be heated, the current flowing perpendicular to areas of the lateral face on the top side and the lateral face on the bottom side that are parallel.

21. The device as recited in claim 18 wherein the at least one component includes a first component and a second component and the at least one face to be heated includes a first joining face of the first component and a second joining face of the second component, the at least one induction coil being shaped around the first and second components such that the at least one induction coil is capable of joining the first joining face and the second joining face.

22. The device as recited in claim 18 further comprising at least one cooling device for cooling the induction coil.

23. The device as recited in claim 18 wherein the at least one component includes a first component and a second component, the at least one induction coil being adapted to join the first component and the second component by inductive low-frequency or high-frequency pressure welding.

24. The device as recited in claim 23 wherein the at least one induction coil is adapted to join the first component and the second component by inductive low-frequency or high-frequency pressure welding between frequencies of 0.05 and 2.5 MHz.

25. The device as recited in claim 24 further comprising a mechanism allowing the inductive low-frequency or high-frequency pressure welding to be performed in a vacuum or in a protective gas atmosphere.

26. The device as recited in claim 18 further comprising an insulator situated at least in areas between the at least one induction coil and the at least one component in the area of the at least one face to be heated, the insulator having at least one face which faces the at least one component that is made of a material that does not significantly or at all hinder the magnetic interaction between the at least one induction coil and the at least one component.

27. The device as recited in claim 26 wherein the at least one face of the insulator is a distance away from the induction coil or the components.

28. The device as recited in claim 26 wherein the insulator is designed in the form of layers or films.

29. The device as recited in claim 26 wherein the geometry of the face of the insulator facing the at least one component is adapted to the geometry of the at least one component.

30. The device as recited in claim 26 wherein the insulator is made of glass, in particular refractory quartz glass, a refractory ceramic or a refractory plastic.

31. The device as recited in claim 18 wherein the at least one component is a BLING or BLISK.

32. The device as recited in claim 18 wherein the at least one component is at least one component of a gas turbine.