Hardfaced wearpart using brazing and associated method and assembly for manufacturing

Patent metadata

Field	Value
Publication number	US-9561562-B2
Application number	US-201213440273-A
Country	US
Kind code	B2
Filing date	Apr 5, 2012
Priority date	Apr 6, 2011
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

An article, such as a hardfaced wearpart, includes a substrate, a sheet metal shell connected to the substrate to define a cavity between the surface of the substrate and the shell, and a composite material filling the cavity and forming a coating on at least a portion of the surface of the substrate, the composite material including a hard particulate material infiltrated with a metallic brazing material. The shell may be connected to the substrate by welding or brazing to the substrate, and may wear away during use. The shell and the substrate may be used as part of an assembly for producing the article, where the shell is used as a mold for forming the composite material by filling the shell with the hard particulate material and subsequently infiltrating with the brazing material.

First claim

What is claimed is:

1. A wear part for earth engaging equipment comprising:
a substrate including a base portion for attachment to the earth engaging equipment and a working portion for engaging earthen material during operation of the earth engaging equipment, the working portion including a surface;
an expendable sheet metal shell connected by welding or brazing to the substrate, a portion of the sheet metal shell being spaced from the substrate to define a cavity between the surface of the substrate and the shell; and
a composite material substantially filling the cavity and forming a coating on at least a portion of the surface of the substrate, the composite material comprising a hard particulate material infiltrated with a metallic brazing material, wherein the composite material is bonded to the surface of the substrate and the shell.

2. The wear part of claim 1 , wherein the shell includes a conformal band around an entire periphery of the shell in surface-to-surface contact with the substrate, and the shell is connected to the substrate by welding or brazing at least along the conformal band.

3. The wear part of claim 2 , wherein the substrate has a bonding surface in surface-to-surface contact with the conformal band, and at least a portion of the substrate within the cavity is inset with respect to the bonding surface such that the composite material has an outer surface that is generally flush with the bonding surface.

4. The wear part of claim 1 , wherein the particulate material comprises tungsten carbide, and the metallic brazing material comprises a Ni—Cr—Si—B brazing alloy.

5. The wear part of claim 1 , wherein the substrate has a hole in the surface and an insert rod in the hole, and wherein the hole and the rod are covered by the composite material.

6. The wear part of claim 1 wherein the sheet metal shell substantially surrounds the substrate.

7. The wear part of claim 1 wherein the substrate includes a first surface over which the composite material is received and a second surface adjacent the first surface to which the sheet metal shell is secured, and wherein the first surface is recessed relative to the second surface such that the composite material is generally flush with the second surface.

8. The wear part of claim 1 wherein the base portion includes a cavity for mounting the substrate on the earth engaging equipment.

9. The wear part of claim 8 wherein the working portion includes a narrowing bit to facilitate digging, and the sheet metal shell and the composite material overlie at least a portion of the bit.

10. The wear part of claim 1 wherein the working portion includes a plurality of surfaces facing in different directions that are each at least partially covered by the composite material.

11. The wear part of claim 1 wherein the composite material is a continuous and uninterrupted coating on the surface of the working portion.

12. The wear part of claim 1 wherein the working portion includes a front end that faces in the direction of movement of the wear part relative to the earthen material during operation of the earth engaging equipment, and the composite material and the shell overlie and cover the front end.

13. A hardfaced wear part for earth engaging equipment comprising:
a tool including a mounting structure for attaching to the earth engaging equipment, a working portion for interacting with earthen materials during operation of the earth engaging equipment, a coated surface on the working portion, and a bonding surface located proximate the coated surface;
a composite hardfacing material forming a coating on the coated surface, the composite hardfacing material comprising a hard particulate material infiltrated with a metallic brazing material, wherein the metallic brazing material is bonded to the coated surface to connect the composite hardfacing material to the tool; and
a sheet metal shell in contact with, bonded to and surrounding the composite material, the shell having a conformal band in contact with the bonding surface of the tool, wherein the shell is connected to the tool by welding or brazing at least between the conformal band and the bonding surface.

14. The hardfaced wear part of claim 13 , wherein the particulate material comprises tungsten carbide, and the metallic brazing material comprises a Ni—Cr—Si—B brazing alloy.

15. The hardfaced wear part of claim 13 , wherein the tool has a hole in the surface and an insert rod in the hole, and wherein the hole and rod are covered by the composite hardfacing material.

16. The hardfaced wear part of claim 13 wherein the coated surface is recessed relative to the bonding surface such that the composite hardfacing material is generally flush with the bonding surface.

17. The hardfaced wear part of claim 13 wherein the mounting structure includes a cavity for mounting the tool on the earth engaging equipment.

18. The hardfaced wear part of claim 17 wherein the coated surface includes a narrowing bit to facilitate digging, and the sheet metal shell and the composite hardfacing material overlie at least a portion of the bit.

19. The hardfaced wear part of claim 13 wherein the coated surface includes a plurality of walls facing in different directions that are each at least partially covered by the composite hardfacing material.

20. The hardfaced wear part of claim 19 wherein the composite hardfacing material is a continuous and uninterrupted coating on the plurality of walls.

21. The hardfaced wear part of claim 13 wherein the tool includes a front end that faces in the direction of movement of the wear part relative to the earthen material during operation of the earth engaging equipment, and the composite material and the shell overlie and cover the front end.

22. A ground-engaging wear part for ground engaging machinery comprising:
a substrate having a mounting structure for attaching to the ground engaging machinery, and a working portion for interacting with earthen materials during operation of the ground engaging machinery, the working portion having a surface;
a wear resistant composite material including a hard particulate material infiltrated by a metallic brazing material bonded to the surface of the substrate and forming a coating on the surface; and
a sheet metal shell connected to the substrate by welding or brazing to form a mold with the substrate and define a cavity between the surface and the shell, the substrate and the shell being cooperatively configured to contain the hard particulate material and the brazing material during infiltration of the hard particulate material, wherein the composite material is bonded to the shell.

23. The ground-engaging wear part of claim 22 , wherein the shell extends around an entire periphery of the substrate.

24. The ground-engaging wear part of claim 22 , wherein the substrate has a hole in the surface, and an insert rod received in the hole.

25. The ground-engaging wear part of claim 22 wherein the substrate includes a first surface over which the composite material is received and a second surface adjacent the first surface to which the sheet metal shell is secured, and the first surface is recessed relative to the second surface such that the composite material is generally flush with the second surface.

26. The ground-engaging wear part of claim 22 wherein the mounting structure includes a cavity for mounting the substrate on the

Assignees

• Churchill Robin Kerry
• Esco Corp

Inventors

• Churchill Robin Kerry

Classifications

• B23K35/365

  Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials · CPC title

• B23K1/20

  Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating · CPC title

• B22D19/08

  for building-up linings or coverings, e.g. of anti-frictional metal · CPC title

• Y10T428/23

  Sheet including cover or casing · CPC title

• B23K31/02 Primary

  relating to soldering or welding · CPC title