Abstract:
Eine Schneidrolle mit einer Achse (2), auf der ein Schneidring (4) mittels einer Lagereinrichtung (10, 12) drehbar geführt ist, die gegenüber der Umgebung mittels einer Dichteinrichtung (28, 30) abgedichtet ist, ist dadurch gekennzeichnet, dass mittels einer Ausgleichsein-richtung (40) ein etwaiger Differenzdruck zwischen der Lagerein-richtung (10, 12) und der Umgebung ausgleichbar ist.
Abstract:
A cutter is provided for shaft and/or tunnel boring which comprises a divided cutter ring (10a, 10b) and a cutter body (8) with a recess (17). The cutter ring (10a, 10b) is secured in the recess (17) by a divided clamping ring (18). The clamping ring (18) is divided into at least two segments (18a, 18b) where each segment (18a, 18b) has two segment ends, with the result that when the clamping ring (18) is tightened, a number of pairs of opposite segment ends are formed. Furthermore, in a tightened condition, all the pairs of opposite segment ends are either connected to securing elements (20), or, in a tightened condition, at least one pair of opposite segments ends is connected with a hinged device (19) while the remaining pairs of opposite segment ends are connected to securing elements (20). The segments (18a, 18b) are tightened in the segments' (18a, 18b) circumferential direction.
Abstract:
The present invention relates to a rotary drilling device (10) comprises a main body member (12).The body member 12 has three rotating discs (13, 14, 15). provided with cutting inserts (17, 18). On the lower part of the main body (12)a polygonal surface (19), perpendicular to the axis of rotation is provided. The surface is preferably a steel plate integral with the drill body or screwed thereon or attached thereon by any method of joining two metal surfaces. At least one cutting insert (20)is disposed close to a corner of the polygonal plate (19)and on the line passing by the corner apex and the center of the polygonal plate. The aim of this cutting insert or inserts (20)is to remove residual column or core of rock)that may result from non-breakage of the rock not directly reached by the cutting inserts of the discs (13,14,15).
Abstract:
An earth boring drill bit 11 that includes a cutting cone 62 with a cutting disk 66. Compacts 50 are inserted within the disk 66 having a chisel shaped end set flush with the cutting disk periphery 67. The compact crests 50 and cutting disk periphery 67 form a generally seamless cutting surface. The cutting cone can 62 further include cutting teeth 72 thereon also having flush mounted compacts 50B. The compacts 50, 50B can be made from a material such as cemented carbide, hardfacing, tungsten, tungsten alloys, tungsten carbide and the cutting cone 62 made from steel.
Abstract:
An earth boring drill bit comprising a bit body having a longitudinal axis along a path of the bit, a first plurality of cutters mounted to the body, and a second plurality of cutters rotatably mounted to the body, wherein a longitudinal axial relationship between the first plurality of cutters and the second plurality of cutters is adjustable. The first and/or second plurality of cutters may be mounted to the body in such a manner as to allow them to slide parallel to the longitudinal axis. The longitudinal axial relationship may be adjusted to exchange the first plurality of cutters and the secondary plurality of cutters between a primary cutting position and a secondary cutting position. The bit may include a sensor to provide an indication of a formation type being excavated by the bit and a processor to control the longitudinal axial relationship based on the indication.
Abstract:
The invention relates to a roller bit for tunnel-boring machines. In preart embodiment types, the entire roller base body (1) always had to be replaced due to the manner in which the bits (3) or cutting points are fastened when the bits (3) were worn out, as they were braze welded or shrink fitted to the roller base body (1). According to the invention, the bits (3) or the cutting points are inserted in a detachable manner so that they can be changed out in the body (1) which carries them. The bits or cutting points can be replaced onsite in a problem-free manner.
Abstract:
An improved disc type rolling rock cutter, and cutterheads employing such cutters. The design incorporates a cutter ring (128), bearing (130), and seal (136) into a single cutter ring assembly (126). This assembly (126) is achieved by using a comparatively large shaft (122) which is normally in the range of 40-50 % of the ring diameter. The shaft design is sufficiently robust to permit a cantilever mount of the cutter. Also, a unique method of shaping and installing hard metal inserts (252) improves cutting efficiency over the life of the cutter and increases wear life in highly abrasive conditions.
Abstract:
A hybrid rock bit (10) which includes at least one cutter cone leg (18) which supports at least one disk cutter cone (20). Each disk cutter cone (20) includes a plurality of spaced apart cutting disk edges (30) which extend continuously around the periphery of the cone (20). At least one drag bit leg (26) is utilized, with the drag bit leg (26) including a plurality of diamond cutting elements (28) in one face thereof. The diamond cutting elements (28) are arranged to contact the borehole bottom during bit operation. Continuous disk cutters (30) are utilized on the cutter cone (20) to minimize "bouncing", or vertical movement of the rock bit (10) which can damage or fracture the diamond cutting elements (28).
Abstract:
A disc cutter (10) for a cutting unit used in an undercutting operation comprising an annular disc body (12) made of a metal alloy or metal matrix composite having a first side (14), a second side (16) arranged substantially opposite to the first side (14) and a radially peripheral part (18); and at least one metal alloy, metal matrix composite or cemented carbide cutting part (20) mounted in and substantially encircling the radially peripheral part (18) of the disc body (12) which protrudes outwardly therefrom to engage with the rock during the mining operation; wherein the at least one cutting part (20) is made from a material having a higher wear resistance than the material used for the disc body (12); characterized in that the disc body (12) and the cutting part (20) are joined by diffusion bonds and a method of producing the same.