Strike constructions, picks comprising same and methods for making same

Abstract

A method of making a strike construction for a pick tool, a strike construction for a pick tool and a pick tool. The strike construction comprises a strike tip (2) and a support body (20), in which respective attachment ends (10,22) of each of the strike tip and support body are joined to each other, the attachment end of the strike tip is coterminous with cemented carbide material comprised in the strike tip, and the attachment end of the support body is coterminous with cemented carbide material comprised in an end portion of the support body, the end portion being configured such that sides of the support body depend divergently from its attachment end. The method includes providing the strike tip (2) and a precursor body (28) for the support body, in which a proximate end (25) of the precursor body is coterminous with cemented carbide material comprised in an end portion of the precursor body, the end portion of the precursor body being configured such that sides of the precursor body depend divergently from its proximate end, the area of which is less than the area of the attachment end of the support body (20). The method further including processing the end portion of the precursor body to increase the area of the proximate end to that of the attachment end of the support body; and joining the respective attachment ends of the strike tip and the support body to provide the strike construction.

Description

technical field [0001] The present disclosure relates generally to impact structures for excavating tools, particularly but not exclusively to impact structures comprising superhard materials; to excavating tools comprising impact structures, particularly but not exclusively to impact structures for road milling, soil stabilization, Mining and drilling into rock formations such as in oil and gas exploration; and methods involved in making impact structures. Background technique [0002] U.S. Patent Application Publication No. 7,950,746 discloses an attack tool for disintegrating material comprising a base segment, a first wear segment bonded to the base segment, and a first wear segment bonded to the base segment at a brazed joint opposite the base segment. A second wear segment of the wear segment. Superhard material is bonded to one end of the second segment, and both segments comprise a hard metallic material such as cemented carbide material. At least a portion of the ...

AI Technical Summary

Problems solved by technology

Excess brazing material can squeeze out to the outside of the brazed joint and the brazing can result in an "affected zone" which can be weakened by cracks, pits, galls or other irregularities or imperfections

Images