Braze thickness control
View Patent ↗In one aspect of the present invention, a degradation assembly comprises an inverted conical face formed in a top end of a metal body tapering towards a central axis of the metal body. A base end of a carbide bolster is adapted to be brazed to the top end of the metal body within the inverted conical face. At least one protrusion is formed in the inverted conical face and is adapted to control a braze thickness between the face and the base end.
1. A degradation assembly, comprising:
a base end of a carbide bolster brazed to a steel body on an annular, tapered face; the base end and the face being separated by a pre-determined distance;
a peripheral annular lip circumscribes the face;
the bolster comprising an outer diameter adapted to be received within the annulus of the annular lip and the bolster also comprising a first transition between the base end and the outer diameter; and
a second transition joins the face and the lip in the proximity of first transition;
the face comprises a medial annular lip with a third transition;
the base end of the bolster comprises a central cavity with a fourth transition, the medial annular lip protruding into the cavity;
wherein space between the bolster and steel body is filled with a braze material and the distance between the transitions is greater than the pre-determined distance.
2. The assembly of claim 1 , wherein the first transition comprises a radius.
3. The assembly of claim 1 , wherein the second transition comprises a radius.
4. The assembly of claim 1 , wherein a largest outer diameter of the bolster is below a top of the lip.
5. The assembly of claim 1 , wherein the lip comprises a triangular cross-section.
6. The assembly of claim 1 , wherein the distance between the third and fourth transitions is greater than the pre-determined distance.
7. The assembly of claim 1 , wherein base end of the bolster comprises a stem inserted into a bore formed in the steel body.
8. The assembly of claim 1 , wherein the degradation assembly is incorporated in a fixed cutter drill bit, horizontal drill bit, percussion drill bit, roller cone bit, or combinations thereof.
9. The assembly of claim 1 , wherein the degradation assembly is incorporated in a mining pick, pavement milling pick, trencher pick, auger pick, or combinations thereof.
10. The assembly of claim 1 , wherein the steel body comprises an integral shank extending from the body adapted for rotatably connection within a holder.
11. The assembly of claim 1 , wherein the steel body is a rotatable shield adapted for to rotate about a protrusions connection to a driving mechanism.
12. The assembly of claim 1 , wherein the distance from the lip to the bolster increases approaching a top of the lip.
13. The assembly of claim 1 , wherein a protrusion formed in the base end or the face controls the pre-determined distance.
14. The assembly of claim 1 , wherein the conical face tapers towards the central axis of the metal body at a declined angle of 20-30 degrees.