SU1318683A1 - Tooth of drilling roller bit - Google Patents

Abstract

The invention relates to a rock-destroying tool and allows to simplify the design and technology of making the bits of the drill bits. The tooth has a base and a working part 3 with an equal cross-section over the entire height. The working part 3 is made in the form of a polyhedron with side edges perpendicular to the blunting platform. The tooth base is made in the shape of a truncated pyramid 1, the area 6 of its smaller base is equal to the area 5 of the initial tooth blunting. This provides the necessary strength of the tooth, which is subject to significant dynamic loads. In the course of the destruction by the teeth of the rock, due to the equal cross-section of the working part 2 along the entire height, a high constant mechanical speed of drilling is ensured. 3 il. (L oo 00 O5 00 with Fy

Description

The invention relates to rock-breaking tools, namely, armament of gear-type roller cone bits.

The purpose of the invention is to simplify the construction and technology of making the bits of the drill bits.

FIG. 1-3 shows embodiments of teeth with a different form of initial blunting.

The bit of the drill bit contains a base in the form of a truncated pyramid 1 with lateral ribs 2 and a working part 3 with an equal cross-section

throughout the height. In this case, the lateral grains and twisting moment of the teeth destroy

25

Neither 4 working parts 2 are perpendicular to the blunting platform 5, the area of which is equal to the area 6 of the smaller base of the truncated pyramid 1, and the areas 5 and 6 have the same shape, 20 which is chosen depending on the type of bits. For type M and MS bits, it is most expedient to use a dull area in the form of a rectangle (Fig. 1), as the simplest to manufacture, in type C bits - a trapezoidal shape with a large base oriented toward the periphery of the well (Fig. 2), and in type T bits, also trapezium and 30 are distant, but the smaller and larger bases of which on the adjacent teeth are oriented in opposite directions, which allows to successfully eliminate

(Fig. 3) 35

forming a rail with a bottom

breed.

At the same time, due to the equal cross-section of the working part 2 over the entire height, a high constant mechanical speed of drilling is provided. Performing the base of the tooth in the form of a truncated pyramid with a given smaller base provides the necessary tooth strength, which is subjected to considerable dynamic loads.

Invention Formula

The drill bit cone, having a base and a working part with a equal cross-section over the entire height, characterized in that, in order to simplify the design and manufacturing technology, the working part is made in the form of a polyhedron with side edges perpendicular to the platform blunting, and the base of the tooth - in the form of a truncated pyramid, the area of the smaller base of which is equal to the area of the initial blunting of the tooth.

. It is also possible to make teeth of a different shape, for example T, P, L-shaped, etc. However, all teeth have a common cross-section over the entire height of the working part 2, thereby providing for

the state of mechanical drilling speed until complete wear of the working part 2. Another common feature is the execution of the side faces 4 of the working part 2 perpendicular to the blunting platform 5. The third common feature for all variants is the execution of their base in the shape of a truncated pyramid 1, the area of the smaller base of which is equal to the area 5 of the initial tooth blunting.

Tooth drill bit work as follows.

When loading axial load

five

0 0

five

0

breed.

At the same time, due to the equal cross-section of the working part 2 over the entire height, a high constant mechanical speed of drilling is provided. Performing the base of the tooth in the form of a truncated pyramid with a given smaller base provides the necessary tooth strength, which is subjected to considerable dynamic loads.

Invention Formula

The drill bit cone, having a base and a working part with a equal cross-section over the entire height, characterized in that, in order to simplify the design and manufacturing technology, the working part is made in the form of a polyhedron with side edges perpendicular to the platform blunting, and the base of the tooth - in the form of a truncated pyramid, the area of the smaller base of which is equal to the area of the initial blunting of the tooth.

2

Editor A. Kozoriz Order 2485/26

Compiled by S.Denisova Tehred M.Hodanich

Corrector in

Circulation 532 Subscription

VNRSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Fig.Z

Corrector v.But ha

Claims (2)

Claim A cone tooth of a drill bit having a base and a working part with an equal cross-section along the entire height, characterized in that, in order to simplify the design and manufacturing technology, the working part is made in the form of a polyhedron with lateral faces perpendicular to the blunt pad, and the base of the tooth is in the form of a truncated pyramid, the area of the smaller base of which is equal to the area of the initial blunting of the tooth. Fi g 2. 1318683