RU2450114C1 - Drilling bit rolling cutter (versions) - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: rolling cutter comprises a body with crowns, the peripheral of which is made with a bisected tooth. The section of the bisected peripheral crown arranged at the side of the rolling cutter top is made in the form of a paired disc. At the same time the disc closest to the bit axis is arranged toothed and is reinforced with hard-alloy bits fixed in grooves between teeth, and the second disc - as solid. There is a version to arrange a section of a bisected peripheral crown with zigzag teeth as closest to the rolling cutter top.

EFFECT: improved performance of drilling works and their prime cost reduction.

3 cl, 3 dwg

Description

The invention relates to a rock cutting tool, namely, to the design of cone drill bits.

Known cone drill bit, including gear rims with areas of blunting at the end sections, reinforced with carbide inserts (see ed. St. USSR No. 1789007, CL ЕВВ 10/16, 1993).

The disadvantages of this cone should be attributed to the limited scope of its application, as well as the fact that in some cases the end reinforcement of the teeth leads to a complication of design and unjustified cost overrun of expensive material. So, for example, reinforcing the teeth of the peripheral crown of the cone from the side of the axis of the bit is not justified, because these sections, even with conventional reinforcement, have armaments that are several times higher than the armaments of the main cone crowns, which are the first to fail.

Closest to the proposed technical essence and the achieved result is the drill bit cone, which includes a body with crowns, the peripheral of which is made with a bifurcated tooth (see P.A. Paly and K.E. Korneev. Drill bits. M .: Nedra, 1971, p. 257, Fig. U1. 68).

The disadvantages of this cone drill bit should be attributed to the uneven armament of the peripheral crown of the cone along the radius of the bit. So, the part of the crown, located on the side of the top of the cone, has armament, which is three times smaller in three-cone bits compared to the rest of the peripheral tooth. This leads to an uneven failure of the teeth, which determines the low overall performance of the bit.

In connection with the stated technical result of the invention is to increase the efficiency of the bit by ensuring uniform loading of the peripheral crowns on the radius of the bit.

The technical result according to the first embodiment is achieved by the fact that in the cone of the drill bit, comprising a body with rims, the peripheral of which is made with a bifurcated tooth, according to the invention, the section of the bifurcated peripheral rim located on the side of the top of the cone is made in the form of a paired disk, while the disk is made toothed to the axis of the bit and is reinforced with carbide teeth fixed in the interdental cavities, and the second disk is solid.

The achievement of the specified technical result also contributes to the fact that carbide teeth are located flush with the top of the disk.

According to the second embodiment, the technical result is achieved in that in the cone of the drill bit, comprising a body with crowns, the peripheral of which is made with a bifurcated tooth, according to the invention, the peripheral crown section located on the top of the cone is equipped with zigzag teeth.

The invention is illustrated in the drawing, where figure 1 shows a General view of the cone; figure 2 - section aa in figure 1 and figure 3 - node B in figure 1.

The cutter of the drill bit contains a housing 1 (see the left part of figure 1) with peripheral crowns 2 with bifurcated gear weapons. In this case, the portion of the peripheral crown 2 located on the side of the top of the cone is made in the form of a paired disk, the disk 3 closest to the axis of the bit being gear and reinforced with carbide teeth 4 fixed in the interdental cavities 5. And the second disc 6, located on the side of the cone of the cone made solid. Disks 3 and 6 in cross section have a trapezoid shape, the inclination angles of which and the dimensions of the smaller base are selected depending on the physicomechanical properties of the drilled rocks.

According to the second variant, the section of the bifurcated peripheral crown 2 (see the right part of FIG. 1), facing the top of the cutter, is equipped with zigzag teeth 7. This embodiment of this section of the peripheral crown 2 is advisable to use when drilling abrasive rocks, which are characterized by significant wear of the bit’s armament.

The principle of operation of the bit is as follows. Under the action of axial load and torque, rock-cutting elements of the crowns destroy the bottom and calibrate the walls of the well. Moreover, due to the execution of the peripheral crown part 2, located on the side of the top of the cutter, in the form of a paired solid 3 and gear discs 6, an increase in both the mechanical drilling speed and the penetration to the bit is provided. This is achieved by increasing the specific load on the rock, which is especially effective when drilling through brittle rocks, reducing torque and increasing the durability of the support due to the lack of dynamic loads. The use of carbide teeth 5 on the most loaded area of the peripheral crown 2 allows you to balance the resource of his work with other areas. When drilling abrasive rocks, this effect is achieved through the use of zigzag teeth, which have more powerful weapons compared to standard weapons cone with a longitudinal arrangement of the teeth.

The use of bits with the proposed design of the cone allows you to increase the technical and economic performance of drilling operations and thereby reduce their cost.

Claims (3)

1. The cutter of the drill bit, comprising a housing with rims, the peripheral of which is made with a bifurcate, characterized in that the portion of the bifurcated peripheral rim located on the top of the cutter is made in the form of a paired disk, while the disk closest to the axis of the bit is gear and reinforced with carbide teeth fixed in the interdental cavities, and the second disk is solid. 2. The cutter of the drill bit according to claim 2, characterized in that the carbide teeth are flush with the top of the disk. 3. The cutter of the drill bit, comprising a housing with crowns, the peripheral of which is made with a bifurcate, characterized in that the portion of the peripheral crown located on the top of the cutter is equipped with zigzag teeth.

Images