RU2462580C1 - Drilling bit rolling cutter - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: drilling bit rolling cutter includes housing with rims reinforced with hard-alloy inserts. Rolling cutter is provided with a sleeve rigidly fixed on a rim which one end is designed with slots for hard-alloy inserts with congruent contact surfaces. Hard-alloy inserts are made on the top side with supporting surface interacting with walls of sleeve grooves.

EFFECT: simplifying technology of attachment of hard-alloy teeth to rims of rolling cut.

3 cl, 7 dwg

Description

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

The performance of pin cone bits depends on many factors, the main of which is the reliability of fastening carbide teeth in the cone body. Currently, the most common method of fixing teeth is the method of pressing, soldering and the use of intermediate bushings.

Known cone drill bit, including crowns, reinforced with carbide inserts that are mounted in the cone by two intermediate sleeves, one of which is a collet (see ed. St. USSR No. 1033691, CL E21B 10/16, 1983).

The disadvantages of this cone should be attributed to the limited scope of its application, since such a design can only be used in bits of large diameter, as well as the complexity of the design of the attachment point of carbide inserts.

Closest to the proposed technical essence and the achieved result is the drill bit cone, which includes a body with crowns reinforced with carbide inserts (see UK patent No. 2436025, CL E21B 10/16, 2007).

The disadvantages of this cone drill bit, the manufacture of which uses the method of pressing carbide inserts, should include the significant complexity of the technology for its manufacture associated with the fastening of carbide teeth, namely the need to polish the side surface of the teeth themselves, and the holes for them on the crowns.

In connection with the stated technical result of the invention is to increase the simplification of the technology of fastening carbide teeth and, thereby, reducing the cost of manufacturing cones.

The technical result is achieved by the fact that the cutter of the drill bit, comprising a housing with crowns reinforced with carbide inserts, according to the invention, it is equipped with a sleeve rigidly mounted on the crown, and one of the ends of the sleeve is made with grooves for carbide inserts having congruent contact surfaces, while carbide inserts on the top side have a supporting surface that interacts with the walls of the groove of the sleeve.

The achievement of the specified technical result also contributes to the fact that:

- the supporting surface of the carbide inserts is made in the form of an annular shoulder,

- the supporting surface of the carbide inserts is made in the form of one or two symmetrically located segments.

The invention is illustrated by drawings, where in Fig.1 shows a General view of the cone; figure 2 is a section aa in figure 1, figure 3 and 4 are embodiments of the supporting surfaces of the teeth, figure 5, 6 and 7, respectively, an insert with a supporting surface in the form of a single-segment, annular and two-segment collar.

The cutter of the drill bit contains a housing 1 with crowns 2 reinforced with carbide inserts 3. The cutter is equipped with a bush 4, rigidly mounted on the crown 2, moreover, one of the ends of the bush 4 is made with grooves 5 at the end under the carbide inserts 3, which on the top side have a supporting surface interacting with the walls of the grooves 5 of the sleeve 4. The supporting surface of the carbide inserts 3 can be made in the form of an annular collar 6 or in the form of one 7 or two 8 symmetrically located segments. The supporting surface in the form of an annular collar 6 is used when equipping the cones with carbide inserts 3 with a hemispherical apex, and the supporting surface in the form of one 7 or two 8 symmetrically arranged segments is used when equipping cones with a curly top, for example, in the form of a wedge. In the latter case, it is necessary to preserve the given pattern of destruction of the face and therefore the specified pattern of defeat of the face must be maintained throughout the entire operation of the cone.

Mounting carbide inserts 3 is as follows. After the installation of carbide inserts 3 in the slots 9 of the housing 1, they are oriented depending on the type of the supporting surface in a certain way. After this, the carbide inserts 3 are finally fixed by the sleeve 4, the grooves 5 of which are aligned with the carbide inserts 3. In this case, the 3 supporting surfaces of the carbide inserts 3 interact with the walls of the grooves 5 of the sleeve 4. After aligning the grooves 5 with the carbide inserts 3, the sleeve 4 is rigidly fixed to the housing 1 in any known manner, for example by laser welding with the formation of seams 10 or by pressing the sleeve 4 on the crown 2.

This embodiment of the cone provides a reliable fastening of carbide inserts 3 without the use of expensive grinding operations on the side surfaces of the inserts 3 and sockets 9 under them in the cone body 1.

The use of bits with the proposed design of the cone allows you to simplify the manufacturing technology of cone bits and, thereby, reduce the cost of both the cone and the bit as a whole.

Claims (3)

1. The cone of the drill bit, comprising a housing with crowns reinforced with carbide inserts, characterized in that it is provided with a sleeve rigidly mounted on the crown, and one of the ends of the sleeve is made with grooves for carbide inserts having congruent contacting surfaces, while carbide inserts are made from the top side with a supporting surface interacting with the walls of the groove of the sleeve. 2. The cutter of the drill bit according to claim 1, characterized in that the supporting surface of the carbide inserts is made in the form of an annular collar. 3. The cutter of the drill bit according to claim 1, characterized in that the supporting surface of the carbide inserts is made in the form of one or two parallel located flats.

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