Heat treating and brazing of an object

Patent metadata

Field	Value
Publication number	US-9399271-B2
Application number	US-201113312348-A
Country	US
Kind code	B2
Filing date	Dec 6, 2011
Priority date	Dec 28, 2010
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

One embodiment of the present invention is a unique method for brazing an assembly. Another embodiment is a unique method of heat treating an object. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for heat treating and/or brazing. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.

First claim

What is claimed is:

1. A method for manufacturing an assembly, the method comprising:
brazing the assembly in a furnace, including:
applying a braze filler metal adjacent to a joint in the assembly;
providing a radiation heat shield conforming to a shape of only a portion of the assembly, wherein the radiation heat shield is configured to reduce radiative heat transfer to the portion of the assembly;
positioning the radiation heat shield on the assembly, wherein the radiation heat shield is supported by the assembly in a location between a portion of the assembly and a heat source included in the furnace to shield the portion of the assembly from the heat source and the entire radiation heat shield maintains a spaced-apart relationship with the braze filler metal and the joint;
placing the assembly and the radiation heat shield in the furnace;
heating the assembly and the radiation heat shield in the furnace to melt the braze filler metal into the joint; and
removing the radiation heat shield from the assembly.

2. The method of claim 1 , further comprising positioning the radiation heat shield to shield only the portion of the assembly from heating elements of the furnace.

3. The method of claim 1 , further comprising configuring the radiation heat shield to form a gap between the radiation heat shield and the portion of the assembly.

4. The method of claim 3 , further comprising supplying a standoff to form the gap.

5. The method of claim 4 , wherein the standoff is formed in the radiation heat shield.

6. The method of claim 1 , further comprising forming the radiation heat shield as a plurality of layers, each layer being separated by a gap.

7. The method of claim 6 , further comprising forming each layer from sheet metal.

8. The method of claim 6 , further comprising providing standoffs configured to form the gap between each layer.

9. A method for brazing assemblies, the method comprising:
supplying a laminated heat shield conforming to a shape of a portion of a first object;
positioning the laminated heat shield on the portion of the first object and assembling the first object into a first assembly to form a first assembly joint;
placing the first object and the laminated heat shield in a furnace so that the heat shield is arranged in a location between the first object and a heat source included in a furnace to shield at least a portion of the first object from the heat source;
heating the first object and the laminated heat shield in the furnace;
cooling the first object and the laminated heat shield;
removing the laminated heat shield from the first object;
positioning the same laminated heat shield on a portion of a second object and assembling the second object into a second assembly to form a second assembly joint; and
placing the second object and the same laminated heat shield in the furnace so that the heat shield is arranged in a location between the second object and the heat source included in the furnace to shield at least a portion of the second object from the heat source,
wherein the entire laminated heat shield is spaced apart from braze filler material arranged adjacent to the first assembly joint and braze filler material arranged adjacent to the second assembly joint.

10. The method of claim 9 , further comprising drawing a vacuum in the furnace.

11. The method of claim 9 , wherein the laminated heat shield is formed from a refractory metal.

12. The method of claim 9 , wherein the laminated heat shield is formed of a plurality of layers of a sheet metal.

13. The method of claim 12 , further comprising forming the plurality of layers by wrapping the portion with a sheet of sheet metal.

14. The method of claim 13 , wherein the wrapping is performed in a spiral fashion.

15. The method of claim 12 , wherein the plurality of layers are concentric.

16. The method of claim 12 , further comprising configuring the laminated heat shield to obtain a desired microstructure in the portion of the first object different than the microstructure of the balance of the first object.

17. A method for brazing an assembly, the method comprising:
wrapping a selected portion of an object in a plurality of layers of a sheet metal;
separating at least a portion of each layer of the sheet metal from an adjacent layer of the sheet metal to form a heat shield;
assembling the object into an assembly to form an assembly joint between the object and another component;
placing the assembly in a furnace so that the heat shield is arranged in a location between a portion of the object and a heat source included in the furnace to shield at least a portion of the object from the heat source;
heating the assembly in the furnace to braze the object to the component assembly with a braze filler material; and
removing the plurality of layers of the sheet metal from the selected portion of the first object, wherein the entire heat shield is spaced apart from the braze filler material.

18. The method of claim 17 , further comprising forming standoffs in at least one layer of sheet metal.

19. The method of claim 17 , further comprising applying a braze filler metal adjacent to a joint in the object.

20. The method of claim 17 , further comprising selecting the number of layers based on a desired cooling rate for the portion of the object.

21. A method for manufacturing an assembly, the method comprising:
brazing the assembly in a furnace, including:
configuring a radiation heat shield to reduce radiative heat transfer to a desired portion of the assembly, and to promote a flow of braze filler metal into a joint in the assembly during the brazing process;
positioning the radiation heat shield on the assembly, wherein the radiation heat shield is supported by the assembly and the entire radiation heat shield maintains a spaced-apart relationship with the braze filler metal and the joint;
placing the assembly and the radiation heat shield in the furnace so that the heat shield is arranged in a location between the assembly and a heat source included in a furnace to shield at least a portion of the first object from the heat source; and
heating the assembly and the radiation heat shield in the furnace to melt the braze filler metal into the joint.

22. The method of claim 21 , wherein the radiation heat shield is configured to prevent or reduce the braze filler metal from wetting a surface of the portion of the assembly and flowing away from the joint during the brazing process.

Assignees

• Shuck Quinlan Yee
• Rolls Royce Corp

Inventors

• Shuck Quinlan Yee

Classifications

• B23K35/24 Primary

  Selection of soldering or welding materials proper (B23K35/34 takes precedence) · CPC title

• F01D5/3061

  by welding, brazing · CPC title

• B23K1/008

  Soldering within a furnace (B23K1/012 takes precedence) · CPC title

• B23K3/085

  Cooling, heat sink or heat shielding means · CPC title

• B23K2201/001

  Operations & Transport · mapped topic