Patent ID: 9199356
Filing Date: 2015-12-01
Classification: B24D

Abstract:
1. A cutting element comprising a super-hard cutting table, a substrate and a metal or alloy layer; the superhard cutting table, the substrate and the metal or alloy layer each having a first surface, the said first surface of the cutting table being joined to the said first surface of the substrate by means of the metal or alloy layer, the metal or alloy layer being located between the said first surfaces of the super-hard cutting table and the substrate so that the first surface of the metal or alloy layer faces the first surface of the cutting table, wherein (i) the first surface of the cutting table is provided with depressions therein and/or projections therefrom, which depressions or projections have undercut surfaces whereby for a depression the side surfaces of the depression incline away from each other in the direction into the thickness of the superhard cutting table, and for a projection the outwardly facing side surfaces of the projection incline away from each other in the direction out of the thickness of the superhard cutting table; and (ii) the first surface of the metal or alloy layer is similarly provided with undercut projections and/or depressions which co-operate with those of the cutting table, the co-operative shaping of the undercut projections and depressions in the cutting table and the metal or alloy layer substantially preventing relative movement between the cutting table and the metal or alloy layer, in any direction, whereby there is a mechanical join between the cutting table and the metal or alloy layer, the metal or alloy layer having been isostatically pressed towards the first surface of the cutting table whereby both the first surface of the metal or alloy layer and the opposing surface of the metal or alloy layer follow the undercut profile of the depressions and/or projections in the cutting table.