Pick with hardened core assembly
View Patent ↗A pick assembly comprising a pick body comprising a shank opposite a front end. The shank may be configured for attachment to a driving mechanism while the front end may comprise a core assembly disposed within an axial bore of the front end. The core assembly may comprise a cutting element bonded to a substrate attached to a bolster disposed within a sleeve which is disposed within the axial bore.
1. A pick assembly, comprising:
a pick body comprising a shank opposite a front end;
the shank configured for attachment to a driving mechanism;
the front end comprising a core assembly disposed within and protruding from an axial bore of the front end; and
the core assembly comprising a cutting element bonded to a substrate and a bolster attached to the substrate opposite the cutting element;
wherein at least part of the substrate and at least part of the bolster are nonrotatively disposed within a sleeve.
2. The assembly of claim 1 , wherein a portion of the bolster is configured to form a press fit with the axial bore of the front end.
3. The assembly of claim 1 , wherein the substrate and bolster comprise substantially equal diameters.
4. The assembly of claim 1 , wherein the sleeve comprises a plurality of segments.
5. The assembly of claim 1 , wherein the sleeve is shrink fitted around at least a portion of the substrate and the bolster.
6. The assembly of claim 1 , wherein the sleeve holds at least a portion of the substrate and the bolster under compression.
7. The assembly of claim 1 , wherein the sleeve is configured to form a press fit within the axial bore of the front end.
8. The assembly of claim 1 , wherein the sleeve comprises axial ribs disposed on an outer surface of the sleeve that are in contact with the axial bore.
9. The assembly of claim 1 , wherein the sleeve comprises an annular flange overlapping a portion of the front end.
10. The assembly of claim 9 , further comprising a fillet between the sleeve and the annular flange.
11. The assembly of claim 1 , wherein the cutting element is bonded to the substrate by a high pressure high temperature process.