SU1633082A1 - Bit for rotary drilling - Google Patents

Abstract

The invention relates to the mining industry and m. used in rotary drill bits. The purpose of the invention is to increase the efficiency of the bit by improving the conditions for cleaning the bottom from broken rock and cooling the cutting edges of the inserts. The bit includes a body 1 and two feathers (II) 2 with carbide inserts 4. A7 form a dissection (P) 3. In P 3 a core-breaking insert 5 is installed, shifted to one of II 2 and lagging behind their tops. (L 2 UE U

Description

The invention relates to the mining industry and can be used in bits for rotary drilling.

The purpose of the invention is to increase the efficiency of the bit by improving the conditions for cleaning the bottom from broken rock and cooling the cutting edges of the inserts.

FIG. 1 shows a chisel for rotary drilling, a general view; Figure 2 - the same, view from the side of the working end of the bit; on fig.Z - section aa in figure 1.

The bit includes a body 1 and two feathers 2, forming rassechku 3. Per 2 are reinforced with carbide inserts 4, and in raschek 3 a core destructive insert b is installed, which is offset from one of the feathers and is lagged behind their tops.

A step 6 is made on the inner side face of each feather. The top cut 7 of step 6 is located between the top of the feather 2 and the base of the cut 3 and its rear side along the bit rotation side wall 8 is perpendicular to the main diametral plane 9 and parallel to its axis. In stations 6, flushing channels 10 are made, having exit 11 on side walls 8 and axes parallel to plane 9 and inclined at an acute angle to the axis of the bit in the direction of the tip of opposite pen 2. Center 3 of cut is perpendicular to plane 9 which opens the internal cavity of 13 bits. The lag h of the core-destructive insert 5 from the tips of the feathers 2 ranges from 0.2-0.4 of the height H of the slit 3, and the width of this

:

20

25

thirty

35

40

45

50

55

inserts - 0, L-0,8 widths of carbide inserts 4 feathers 2.

Chisel works as follows.

During the drilling process, the axial load and torque are transmitted to the bit, under the action of which carbide inserts 4 feathers 2 destroy the rock, and core-breaking insert 5 generates the core. In order to remove the products of destruction from the well into the well, along the channels 10 of the bit, washing fluid is supplied, which is directed along the front facets of the core-breaking core insert 5 and feathers 2 to the tops of the latter. In this part of the fluid through the groove 12 compact narrow stream goes in the center of the bit.

The directional flow of fluid to the places of intensive formation and accumulation of degradation products, along with the choice of the optimal lagging value of the core-destructive insert from the tips of the feathers, improves the mode of cleaning the well from the destroyed rock and simultaneously provides good heat removal from the cutting edges of the inserts 4 and 5. In turn ,. The location of the inlet openings of the channels Yu on the rear side of the lateral walls of the chisel side walls 8 of the ledges b, which are also located perpendicular to the main diametral plane 9 of the bit and parallel to its axis, eliminates the possibility of sticking these channels, which also has a positive effect on cleaning the well.

In addition, the fluid flows out of the channels 10 in the direction opposite to the rotation of the bit, thereby achieving an increase in torque due to the reactive force of the outflow.

All this will try the efficiency of the bit.

a16330Й26

between the top of the pen and the base of the dissection, and the rear - along the rotation of the bits, the side wall is perpendicular to the main diametral plane of the bit and parallel to the axis of the latter

Claims (1)

Claims Chisel for rotary drilling, comprising a housing with flushing channels, two with solid inserts, forming a dissection of the additional material and installed and dissecting behind the tips of the feathers a core-breaking insert replaced to one of the feathers, which differs ng /, which in order to increase the efficiency of the bit by improving the condition of cleaning the bottom from the destroyed rock and cooling the cutting edges go, and the flushing channels are made in the ledges with access to their side walls, perpendicular to the main Diametral plane, and axes, parallel to the diametral plane and inclined at an acute angle to the axis of the bit in the direction of the top of the opposite pen, and in the center of the cutting 15 perpendicular to the main diametral plane, a groove is made until the inner cavity of the body is opened, while the lag of the core-destructive inserts from the tops of the feathers make up the inserts; on the inner side face 20 0.2–0.4, the cutting heights, and the width of each feather is made rectangular of this insert — 0.6–0.8 in the width of a solid ledge, the end of which is located alloy inserts feathers. Phage. 2 go, and the flushing channels are made in the ledges with access to their side walls, perpendicular to the main diametral plane, and axes, parallel to the diametral plane and inclined at an acute angle to the axis of the bit in the direction of the top of the opposite pen, and in the center of the cutting perpendicular to the main diametral plane, a groove is made until the inner cavity of the body is opened, while the lag of the core-destructive 12 Fig.Z