Press-fit pick
View Patent ↗In one aspect of the invention, a pick comprises a shank attached to a base of a steel body, a cemented metal carbide core press fit into the steel body opposite the shank, and an impact tip bonded to a first end of the core opposite the shank. The impact tip comprises a superhard material opposite the core, and the core comprises a second end and a largest diameter. A distance through the body from the shank to the second end of the core is less than the largest diameter of the core.
1. A method for providing cost effective picks, comprising:
providing a pick adapted for attachment to a driving mechanism;
the pick comprising a shank and a used cemented metal carbide core attached to a worn steel body, the carbide core comprising a tip with a carbide substrate and a diamond material attached to a working surface, the substrate comprising a thickness less than 6 mm;
removing the used carbide core from the worn steel body; and
attaching the used carbide core into a cavity substantially opposite a shank of a steel body of a pick.
2. The method of claim 1 , wherein the step of attaching the used carbide core includes press fitting.
3. The method of claim 1 , wherein the step of attached the used carbide core includes brazeing.
4. The method of claim 1 , wherein the carbide core is attached to a depth of at least 65% of a total depth of the worn or unused steel body.
5. The method of claim 1 , wherein the carbide core is attached to a depth of the steel body such that a distance from the shank to a second end of the carbide core is less than a primary diameter of the carbide core.
6. The method of claim 1 , wherein the carbide core is attached into the steel body such that a ratio of forward volumes of the core to the body is less than 3.5 times a ratio of rear volumes of the core to the body.
7. The method of claim 1 , further comprising a step of renting the pick to a second party for use according to a rental agreement.
8. The method of claim 7 , wherein the second party is charged for the amount of time they posses the pick.
9. The method of claim 7 , wherein the second party is charged for the volume or area of material they mill with the pick.
10. The method of claim 7 , wherein the second party is charged for the distance of material that they mill with the pick.
11. The method of claim 7 , wherein the second party is charged for the weight of the material that they mill with the pick.
12. The method of claim 1 , wherein the step of providing a pick comprises retrieving a rented pick from a second party.
13. The method of claim 1 , further comprising a step of selling the pick with an incentive given for return of the used pick along with the core.
14. The method of claim 1 , wherein the carbide core is removed by cutting or grinding away the steel body of the provided pick.
15. The method of claim 1 , wherein the shank of the provided pick comprises a reentrant.
16. The method of claim 1 , wherein the pick comprises a wear resistant washer disposed around the shank proximate the steel body.
17. The method of claim 1 , wherein the driving mechanism is a milling drum connected to a pavement milling machine.
18. The method of claim 1 , wherein the shank is adapted to be secured to a bit body adapted for subterranean drilling.
19. The method of claim 1 , wherein the shank is adapted to be secured to a trenching machine.