SU1219776A1 - Drilling crown bit - Google Patents

Description

The invention relates to the field of rock cutting tools, namely, diamond drill bits.

The purpose of the invention is to increase the mechanical penetration rate by reducing the contact surface of the sectors.

FIG. 1 shows a crown; figure 2 is a view of And figure 1; on fig.Z - section bb in figure 2; figure 4 - section in figure 2.

The drill crown comprises a housing 1 and a matrix 2, divided into four working sectors 3 by flushing grooves 4. The working sectors have cutting edges 5 formed by bevels 6.

Edge 5 is reinforced with downhole-forming 7, face 8 and core-forming 9 diamond cutters located along the edge of 5 directly on the cutter 5 and placed at an angle of 45 ° to the axis passing through the wellbore cutters of two opposite working sectors. The cutting edges of adjacent sectors are perpendicular to each other.

The principle of operation of the drill bit is as follows.

Vidk

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five

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In the process of drilling during the rotational movement of the crown, diamonds 7, 8 and 9 destroy the rock along a flat face and form a well. The first well-producing diamonds 7 come into play, then the face 8 and last of all core-forming diamonds 9. The well-forming diamonds 7 work in three-sided blocked mode. They are larger in grain than face 8, which destroy the rock or in a two-sided blocked mode. At the same time, less specific energy is spent on destruction than in the three-sided blocked mode of diamonds.

During the operation of the drill bit between the bevels 6, the borehole walls and the core, the flushing fluid is constantly circulating due to its forced pumping out from the catch edges 5 located on the end surfaces of the working sectors 3 at an angle of 45 ° to the planes passing through the borehole diamonds and the crown axis. Such a construction of the sectors ensures timely removal of the broken rock from the bottom and efficient cooling of all diamonds.

in-in

F1 / g.2.

Compiled by Y. Palashchenko

Editor N. DankulichTechred I. VeresKorrektor E. Roshko

Order 1302/42 Circulation 548Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Fmg.Z

Ф14г, .Ч

Claims (1)

A BORING BIT, including a housing with a matrix, divided by flushing grooves into working sectors reinforced by bore-forming, end-face and core-forming diamond cutters, characterized in that, in order to increase the mechanical penetration speed by reducing the contact surface of the working sectors, the latter have cutting edges with these cutters, placed in a straight line oriented at an angle of 45 ° to the axis passing through the bore-forming cutters of two diametrically opposite working sectors, and cutting ki neighboring sectors are orthogonal to each other. Figure 1