Sandvik Mining and Construction Tools AB

A method of treating a cemented carbide insert for rock drilling and mineral cutting comprising a core of cemented carbide and a surface zone of cemented carbide wherein the core further contains eta-phase and the surface zone is free of eta-phase, and wherein the mining insert is subjected to a surface hardening process wherein the surface hardening process is executed at an elevated temperature of or above 50° C.

An earth boring rotary bit and method of manufacturing the same is provided. The rotary bit is intended for rotary drilling and includes a bit body having three uniform legs and three uniform rolling cone cutters rotatably mounted to the legs. The three cone cutters have a uniform angular offset (Ao) and a linear offset (Lo). Further, the magnitude of the angular offset is 2-17° and the magnitude of the linear offset is 1.6-18 mm.

A driver socket arranged for installation of a ground reinforcement bolt, wherein the driver socket includes a rotation sensor arranged for measuring rotation of the driver socket 1 . The driver socket includes a processing unit configured to receive a signal from the rotation sensor and to derive, based on the signal from the rotation sensor, rotation data related to the number of revolutions the driver socket has been rotated.

A sub-assembly, rock drilling rig and method of absorbing vibrations in rotary and DTH drilling. The sub-assembly is for transmitting torque and axial forces between a rotating head and a drilling tool. There is an axial floating arrangement for providing an allowed limited axial relative movement between coupling elements of the sub-assembly. The arrangement comprises several axial drive pins for transmitting the torque. First ends of the drive pins are mounted immovably and second ends are mounted with clearances, whereby the drive pins can bend under torsional shocks. Thus, the drive pins serve as torsional dampening elements.

A roller cutter for a raise boring tool includes a journal and a cutter shell positioned radially around the journal. The journal includes an external surface from which a journal end protrudes from. A seal retainer is positioned between the journal and the roller cutter, and wherein at least one digital identification tag is located on the roller cutter.

An end piece, a drill pipe assembly and method is provided. The drill pipe assembly is for rotary drilling and DTH drilling and includes a drill pipe provided with end pieces at its opposite ends. For the mounting of the end pieces a shrink fit and welding is implemented. For improving the shrink fit, the contact surfaces between the components are tapered.

A method of treating a cemented carbide insert for rock drilling and mineral cutting is provided. The insert includes a core of cemented carbide and a surface zone of cemented carbide, wherein the core further contains eta-phase and the surface zone is free of eta-phase. The mining insert is subjected to a surface hardening process, wherein the surface hardening process is executed at an elevated temperature of or above 50° C.

A method of redistributing the binder phase of a cemented carbide mining insert having a WC hard-phase component, optionally one or more further hard-phase components and a binder includes the steps of providing a green cemented carbide mining insert; applying at least one binder puller selected from a metal oxide or a metal carbonate to only at least one local area of the surface of the green cemented carbide insert; sintering the green carbide mining insert to form a sintered cemented carbide insert; and subjecting the sintered cemented carbide insert to dry tumbling process executed at an elevated temperature of or above 100° C., preferably at a temperature of or above 200° C., more preferably at a temperature of between 200° C. and 450° C.

A shank adapter forming part of a drilling assembly includes a longitudinal axis, an external surface, an internal surface, a threaded part provided at a forward end and a plurality of splines provided at a rearward end. A machine part extends axially between the threaded part and the splines, wherein at least a part of the external surface is coated with a first corrosion protection layer of nickel and at least part of the first corrosion protection layer is coated with a polymer based sealant top layer.

A sintered cemented carbide insert for mining or cutting applications includes a first zone having 3-18 wt % binder phase, unavoidable impurities, a balance of tungsten carbide having a mean grain size of between 0.5-20 μm. The insert includes a second zone having a same amount, within +/−3 wt %, of binder phase as the first zone, any unavoidable impurities, and a balance of tungsten carbide having an average grain size of between 0.5-20 μm. The first zone and the second zone are adjacent to each other. The average WC grain size in the first zone is different to the average WC grain size in the second zone, and the binder phase in both the first zone and the second zone has between 2-15 wt % Cr measured as a fraction of the total binder content.