Abstract: A method is provided which bonds a composite abrasive compact to a cemented carbide pin. The method includes the steps locating a braze alloy having a perforated metal material embedded therein between a surface of the composite abrasive compact and a surface of the cemented carbide pin. The braze alloy has a melting point below that of the metal material. The surfaces are urged together, the temperature of the braze alloy is raised to above its melting point and maintained at this temperature for a short period. The alloy is then allowed to cool and solidify and bond the surfaces together.

Abstract: A tool insert having a cemented carbide substrate with a recess formed in one end of the substrate and having an abrasive compact located in the recess and bonded to the substrate. The cemented carbide substrate has two ends joined by a side, and the recess formed in the substrate has a side and a base, with the side sloping inwards towards a center point of the base. The abrasive compact includes a top surface which provides a cutting surface or edge for the tool insert, a bottom surface which is complementary to the base of the recess, and a side surface which is complementary to the side of the recess.

Abstract: A tool component comprises an abrasive compact bonded to a support which itself is bonded through an alloy to an elongate cemented carbide pin. The alloy has a liquidus below 900.degree. C. and the following composition, by weight:______________________________________ Mn 15-41% Cu 67-41% Ni 1-5% Au 10-17% ______________________________________and at least one of In, Sn, Zn and Ag, the In and Sn, when present, being in an amount not exceeding 20% by weight and the Zn and Ag, when present, being in an amount not exceeding 30% by weight.The shear strength of the bond achieved between the support and the pin exceeds 335 MPa.

Abstract: A tool component comprises an abrasive compact bonded to a support which itself is bonded through an alloy to an elongate cemented carbide pin. The alloy has a liquidus below 900.degree. C. and the following composition, by weight:______________________________________ Mn 15-41% Cu 67-41% Ni 1-5% Au 10-17% ______________________________________The shear strength of the bond achieved between the support and the pin exceeds 345 MPa.

Abstract: A cutter pick for a mining machine has a lug carrying a cutting tip of hard, abrasion resistant material at its forward end. A passage extends through the lug with provision at its rearward end for connection to a source of high pressure liquid and with a nozzle at its leading end venting through the cutting tip. The intention is that high pressure liquid issueing from the nozzle will degrade the rock before it is attacked by the cutting tip.

Abstract: In the brazing of a component which comprises a carbide substrate carrying a layer of PCD (polycrystalline diamond) to a steel body, appropriately shaped brazing shims are placed between mating surfaces which are to be brazed. The component is forced towards the steel body and the steel body is heated uniformly across its surface where brazing is to take place. This is achieved by means of an induction heater placed adjacent the steel body at a position remote from that surface of the steel body where brazing is to take place. The local temperature at the PCD layer is monitored continuously and the heating process controlled so that this local temperature does not exceed 750.degree.. After brazing, the component and steel body are permitted to cool down slowly to ambient temperature.

Abstract: Thermally stable abrasive compacts of hexagonal shape have been found to have excellent abrasive properties in the abrading of a medium to soft rock having an unconfined compressive strength of less than 240 MPa. Preferably the abrasive tool used is a surface set drill bit wherein some of the thermally stable abrasive compacts are so located around the working edge of the bit that a side thereof acts as a gauge stone for the working portion.

Abstract: A cutting component comprising:(a) a composite abrasive compact comprising an abrasive compact bonded to a cemented carbide support;(b) an elongate, cylindrical pin having end surfaces and a side surface;(c) a recess for receiving the composite abrasive compact sloping from one end surface of the pin to the side surface;(d) the composite abrasive compact being located in the recess and bonded to the pin such that the abrasive compact presents a cutting edge for the cutting component and the abrasive compact lies wholly within the side surface of the pin and an imaginary extension thereof; and(e) a groove in the recess which spaces the abrasive compact from the pin.

Abstract: A spring clip which is used to secure the shank of a cutting pick to a pick box or cutting drum in a mining machine. The clip is formed of spring steel and has spaced legs joined by a bight portion. Associated with the bight portion is a bearing part which bears upon the shank of the cutting pick when the clip has been aligned with the shank and has been forced transversely to the shank so that the shank is received between the legs.

Abstract: A method of bonding a cemented carbide surface to a metal surface is provided. The method involves applying an alloy layer to one or both of the surfaces, the alloy comprising a major amount of nickel or copper and a minor amount of phosphorus, heat treating the alloy layer below its liquidus temperature to cause it to diffusion bond to the surface top to which it is applied and bonding the surfaces together by means of a solder or braze alloy which preferably has a liquidus of no more than 750.degree. C. The method has particular application to bonding cutting inserts to drill bits and cutting tools for mining machines.

Abstract: A cutting tool for a mining machine of the type used for cutting soft materials such as coal. The cutting tool has a holding lug 10 and a cylindrical pin 18 located in a socket in the holding lug and presenting a cutting edge or surface in the form of an abrasive compact 26. The pin 18 is secured in the socket by means of a non-metallic adhesive or soft solder and a body 38 located in a cavity formed by co-operating and aligned grooves 32, 34 formed in contacting surfaces of the pin and a side of the socket. The body 38 in the cavity serves to restrain the pin against rotational movement in the socket.