SU52058A1 - Bit for rotary drilling - Google Patents

Description

The proposed ribbed-blade bits are intended for rotary drilling and are equipped on their working part with parallel inclined cutting surfaces with blade-blades, which, if desired, can be reinforced with hard alloys.

In the schematic drawing, figures 1-4 depict a chisel in side view, and FIG. 5 and b - sections according to AB of FIG. 3 and 4. Cutting surfaces-blades 2 l 3 (fig. 1) of chisels are reinforced with ribs 4. Screwing with the drilling tool located above the chisel is performed by cutting 7 on its neck.

Blades 2 VI 3 (Fig. 1) are located in mutually opposite directions. For greater durability of the blades 2 and 3, they are reinforced with hard alloys and metal diamonds so that mutually opposite blades during drilling complement each other in work. The head of the bit is provided with channels for washing it with circulating solution and has a special cut for screwing into the drill pipe. The cutting cavities can be arranged in different ways: for example, by crossing, as shown in FIG. 1, or at an angle, as in FIG. 2, etc. The angle of inclination of the planes should be determined experimentally. Inclined planes and longitudinal edges, depending on the working conditions, may have a rectangular, sickle-shaped section, as well as any other shape.

Depending on the need, the reinforcing longitudinal ribs may be unevenly distributed across the bit width directly (Fig. 1 and 2) or with some rotation in the direction of bit rotation (Fig. 3 and 4). These ribs can be optionally also reinforced with hard alloys.

Thus, the operation of the bit proceeds in the following order: the lower pair of blades and partly the longitudinal ribs cut into the ground and crush it, drilling the rock until it has worked completely. After that, the next pair of blades, etc., goes into operation. The chisel operates continuously until all the blades have worked.

The subject matter of the invention.

Chisel for rotary drilling, characterized in that it is made in the form of cutting blades 2, 3 arranged on several floors, fastened with ribs 4, which in turn are also cutting blades.

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