摘要:
The invention relates to a drilling tool, especially for percussion drilling, which comprises a cutting element (3) that is configured as a plate (3) or head and that has at least one cutting edge (11) defined by a cutting face (6) and a free face (10). The cutting edge (11) is associated with a first free face section (10a) which is limited in a cutting plane at a right angle to the cutting edge (11) and parallel to the longitudinal axis (L) of the drilling tool (1) by a convex bulge (13) or a convex polygon outline. The vertical height of a rib (14) defined by the first free face section (10a) and an associated first cutting face section (6a) ranges from 0.1 mm to 1.0 mm.
摘要:
A hard material insert (1) for a drill (2, 2′) includes an axially central reinforcement (3) provided in the insert, and two diametrically opposite, radial arms (4) each having a cross-section tapering radially outwardly, opposite free side (8) and connection side (7), with the free and connection sides (8, 7) of one of the radial arms (4) being arranged alternatively to the free and connection sides of another of the radial arms (4), and a concave recess (6) provided on the connection side (7).
摘要:
In one aspect of the present invention, a downhole fixed bladed bit comprises a working surface comprising a plurality of blades converging at a center of the working surface and diverging towards a gauge of the bit, at least on blade comprising a cutting element comprising a superhard material bonded to a cemented metal carbide substrate at a non-planer interface, the cutting element being positioned at a positive rake angle, and the superhard material comprising a substantially conical geometry with an apex comprising a curvature.
摘要:
A design for a gage tooth of the milled tooth variety is provided. The gage facing surface of each tooth is shaped so that only a narrow surface of each tooth contacts the borehole wall. Adjacent areas on each tooth slope away from the wall. The narrow gage facing surfaces, the sloping areas, and other areas are all covered with a suitable hard metal facing material.
摘要:
A rotary tool that includes an elongate tool body and a hard insert affixed to the tool body is disclosed. The hard insert includes a WC-cermet including tungsten carbide and about 5 wt. % to 19 wt. % Co--Ni--Fe-binder. The Co--Ni--Fe-binder is unique in that even when subjected to plastic deformation, the binder substantially maintains its face centered cubic (fcc) crystal structure and avoids stress and/or strain induced transformations.
摘要:
A rotary borer has a body (10) mountable on a drill steel and one or more cutting tips (30) at a front of the body (10). Each tip (30) is tapered and is frictionally received in a corresponding tapered slot (22) in the body (10). The slot (22) has a trailing, rigid anvil surface (16), which extends almost to the extremity of the tip (30) to support the tip (30) and to locate it laterally, and a leading, resilient retaining surface (20) well shy of the extremity of the tip (30) to expose a portion of the tip. The tip (30) is readily replaceable. Release of the tip can be effected by heat or by means of taper drift (38) for which a transverse hole (37) is provided proximate a bottom of the slot (22).
摘要:
The instant invention is an improved cutter head with a salvageable end cap for hollow stem augers. The end cap includes a mechanism for retrieval upon completion of a drilling operation thereby allowing the end cap to include various bit formations so as to assist in the drilling operation. The side wall of the cutter head is modified to include a keyhole slot for maintaining of the end cap in a rigid position to prevent rotational movement.
摘要:
A rock drill for hammer drilling machines is proposed, which has a helical shank and a drill head which is connected thereto and on whose end face are arranged a main cutting tip inclined in the shape of a roof and also auxiliary cutting tips disposed transversely thereto. The drill head has two laterally opposite flats for the formation of drilling dust grooves. In plan view the drill head has a very largely rectangular shape in cross section, an acute angle .beta..sub.1 being enclosed between the main cutting tip and the trailing auxiliary cutting tips.
摘要:
A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.
摘要:
A drill bit for cutting hard and abrasive materials has cutting lips formed from sintered polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN) contained in one or more inserts installed in a drill bit blank. The inserts are made by forming depressions in the upper surface of a matrix slab of tungsten carbide, filling the depressions with fine mesh grains of diamonds or cubic born nitride, subjecting the slab to heat and pressure sufficient to fuse the grains to one another and to the surrounding matrix walls, and then cutting the matrix slab to remove individual inserts containing an elongated vein having an exposed PCD or PCBN surface supported by at least one and preferably two or more side walls of tungsten carbide. A rectangular slot having side walls parallel to one another and equidistant from the diameter of a cylindrical drill bit blank is cut into one transverse end wall of the blank, and one or more inserts placed in the slot. The tungsten carbide walls of the inserts are then brazed to the adjacent side walls of the slot. The bit is then ground to a desired configuration, in which PCD or PCBN material forms at least part of at least one cutting lip of the finished drill bit. Preferably, flutes are formed in drill bit blank as part of the grinding operation.