Abstract: A rock drill insert a substrate having a tip portion and a base portion, wherein the tip portion includes a polycrystalline diamond (PCD) structure bonded to the substrate. The substrate is formed of a cemented carbide comprising at least 5 wt.-% of a metallic binder. At a distance of 50 ?m from a surface of the base portion of the substrate, at least 20 vol.-% of the metallic binder is present in a hexagonal close packed (HCP) crystallographic form. Furthermore, a drill bit including a plurality of the above-described rock drill insert is disclosed, as well as a method for manufacturing the rock drill insert.

Abstract: This disclosure relates to a percussive drill bit comprising PCD studs and a hard facing material that is strategically located to minimise stud pop outs and the amount of hard facing material used.

Abstract: Drill bit insert with a sintered cemented carbide body including a hard phase of tungsten carbide (WC) and a binder phase wherein the cemented carbide comprises 5.0-7.0 wt % Co, 0.10-0.35 wt % Cr, and a Cr/Co weight ratio of 0.015-0.058. The cemented carbide body has a hardness of 1520-1660 Hv30 and a toughness of K1c?10.0 both measured in the bulk at the center of the longitudinal axis through the center of the insert, or ?5 mm from any surface of the insert. The insert further has a surface toughness K1c?12.0 measured at 0.5 mm below the surface of the body in a transverse direction to the longitudinal axis the insert. The invention also relates to a drill bit comprising the insert and the use of such a drill bit for drilling.

Abstract: A cutting tool is provided. The cutting tool comprising a tip, a body and a shank for attaching the cutting tool to a tool holder. The body has an outer body surface, a body shank end arranged towards the shank and a body tip end arranged towards the tip. The tip has an outer tip surface, a tip peak and a tip base, the tip base being attached to the body tip end of the body. The cutting tool comprises a plurality of grooves extending substantially continuously over both the outer tip surface and the outer body surface, each groove having a predetermined extension in a longitudinal direction of the cutting tool.

Abstract: A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.

Abstract: Drill bit insert with a sintered cemented carbide body including a hard phase of tungsten carbide (WC) and a binder phase wherein the cemented carbide comprises 5.0-7.0 wt % Co, 0.10-0.35 wt % Cr, and a Cr/Co weight ratio of 0.015-0.058. The cemented carbide body has a hardness of 1520-1660 Hv30 and a toughness of K1c?10.0 both measured in the bulk at the center of the longitudinal axis through the center of the insert, or ?5 mm from any surface of the insert. The insert further has a surface toughness K1c?12.0 measured at 0.5 mm below the surface of the body in a transverse direction to the longitudinal axis the insert. The invention also relates to a drill bit comprising the insert and the use of such a drill bit for drilling.

Abstract: A cutting tool is provided. The cutting tool comprising a tip, a body and a shank for attaching the cutting tool to a tool holder. The body has an outer body surface, a body shank end arranged towards the shank and a body tip end arranged towards the tip. The tip has an outer tip surface, a tip peak and a tip base, the tip base being attached to the body tip end of the body. The cutting tool comprises a plurality of grooves extending substantially continuously over both the outer tip surface and the outer body surface, each groove having a predetermined extension in a longitudinal direction of the cutting tool.

Abstract: A cutting tool is provided. The cutting tool comprises a tip, a body and a shank. The tip has a tip radius and a tip length. The body has a body radius and a body length between the shank and a recess portion along a longitudinal axis of the body. The recess portion comprises a wall which forms a recess with a depth into the body for retaining a major part of the tip length within the recess. The body radius at half the depth of the recess does not exceed two tip radiuses. The tip is made of a hard metal alloy with a hardness of at least 1300 HV50 and the body is made of a steel alloy with a hardness of at least 450 HV30.

Abstract: A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.

Abstract: A cutting tool is provided. The cutting tool comprises a tip, a body and a shank. The tip has a tip radius and a tip length. The body has a body radius and a body length between the shank and a recess portion along a longitudinal axis of the body. The recess portion comprises a wall which forms a recess with a depth into the body for retaining a major part of the tip length within the recess. The body radius at half the depth of the recess does not exceed two tip radiuses. The tip is made of a hard metal alloy with a hardness of at least 1300 HV50 and the body is made of a steel alloy with a hardness of at least 450 HV30.

Abstract: A method of welding a fuel rod includes the following steps. An end plug and a cladding tube of the fuel rod are brought together to abut each other, and welded by applying a laser beam directed to a welding zone to melt material of the end plug and the cladding tube. The welding is sensed by sensing radiation within a first wavelength range, which includes the wavelength of the laser beam coming from reflections from the welding zone, sensing radiation within a second wavelength range different from the first wavelength range, which includes infrared radiation from melted material, and sensing radiation within a third wavelength range different from the first and second wavelength ranges, which includes radiation from plasma. The welding and melting of material is monitored by monitoring the sensed radiations.

Abstract: A method of welding a fuel rod includes the following steps. An end plug and a cladding tube of the fuel rod are brought together to abut each other, and welded by applying a laser beam directed to a welding zone to melt material of the end plug and the cladding tube. The welding is sensed by sensing radiation within a first wavelength range, which includes the wavelength of the laser beam coming from reflections from the welding zone, sensing radiation within a second wavelength range different from the first wavelength range, which includes infrared radiation from melted material, and sensing radiation within a third wavelength range different from the first and second wavelength ranges, which includes radiation from plasma. The welding and melting of material is monitored by monitoring the sensed radiations.

Abstract: A method for manufacturing a diamond composite, includes: a) mixing diamonds with additives, the mixture comprising at least 50 wt % and less than 95 wt % of diamonds and more than 5 wt % additives; b) forming a work piece from the mixture using a pressure of at least 100 Mpa; c) heating the formed work piece to at least 300° C. for removing possible water and wholly or partially removing additives; d) heating the work piece and controlling the heating temperature and heating time so that a certain desired amount of graphite is created by graphitization of diamonds, wherein the amount of graphite created by graphitization is 3-50 wt % of the amount of diamond; e) infiltrating silicon or silicon alloy into the work piece.

Abstract: A method for manufacturing a diamond composite, includes: a) mixing diamonds with additives, the mixture comprising at least 50 wt % and less than 95 wt % of diamonds and more than 5 wt % additives; b) forming a work piece from the mixture using a pressure of at least 100 Mpa; c) heating the formed work piece to at least 300° C. for removing possible water and wholly or partially removing additives; d) heating the work piece and controlling the heating temperature and heating time so that a certain desired amount of graphite is created by graphitization of diamonds, wherein the amount of graphite created by graphitization is 3-50 wt % of the amount of diamond; e) infiltrating silicon or silicon alloy into the work piece.

Abstract: Device for checking of flatness and smoothness of an item (10) comprising components for measuring of flatness with an interference method and for measuring of smoothness with a reflection method, where the item (10) or a mirror (23) close to the item can be tilted in two directions until stripes of an interference pattern created on a first image plane (14) have a predetermined distance and a predetermined general direction, the deviations from flatness being calculated from the distance and curvature of the stripes, and the smoothness being calculated from the brightness variations in the mirror image created by the reflection method on a second image plane (22).