CN2695600Y

CN2695600Y - Deformed corona hard alloy teeth

Info

Publication number: CN2695600Y
Application number: CN 200420032693
Authority: CN
Inventors: 吴玲; 李建伟; 王霞; 郑家伟
Original assignee: CHENGDU MACHINERY GENERAL FACTORY SICHUAN PETROLEUM ADMINISTRATION
Current assignee: CHENGDU MACHINERY GENERAL FACTORY SICHUAN PETROLEUM ADMINISTRATION
Priority date: 2004-02-03
Filing date: 2004-02-03
Publication date: 2005-04-27
Anticipated expiration: 2014-02-03

Abstract

The utility model discloses deformed corona hard alloy teeth which relate to the technical field of manufacturing of the hard alloy teeth of a toothed roller bit for the drilling petroleum, natural gas, mines, wells and geology. The utility model provides the deformed corona hard alloy teeth which ensures the corona to be provided with sufficient exposure in height and be different from the wedge shape, the scoop shape, the cone spherical shape, or the side wedge shape; the lower part of the deformed teeth of the utility model is in a cylinder shape and is tightly matched with a cone body; the cross section of the upper part of the corona is in the shape of a dumb bell. The utility model overcomes the defects of the premature breakage of the hard alloy teeth in the traditional shape, and the tooth breakage and fracture, severe tooth abrasion, etc. under the bad operating conditions.

Description

A kind of special-shaped crown hard-metal insert

Technical field: a kind of special-shaped crown hard-metal insert relates to a kind of insert bit hard-metal insert manufacturing technology field that oil, natural gas, mine, well and geological drilling are used that is used for.

Background technology: because rock bit can adapt in the stratum of different lithology and creep into, at present, it remains one of main rock crushing tool in the drilling process, the cutting element of rock bit is a tooth, drill teeth is divided into steel-tooth and inserted two big classes by the tooth material, inserted is that mode by interference fit is fastened on hard-metal insert on the conical cutters housing, the shape of hard-metal insert mainly is a wedge shape, spoon shape, conisphere shape, the limit wedge shape, along with the powdered metallurgical material development of technology, the intensity of hard-metal insert and abrasion resistance overall target are greatly improved, enlarged the scope of application of tungsten carbide insert bit, make it not only be used for high-intensity abrasive layer, also adopt and exceed the sword structure, be used for medium ground and soft formation, the shortcoming of prior art is: no matter be steel-tooth or inserted, reason owing to its profile of tooth, during rock bit work, tooth on the gear wheel produces crushing to bottom rock, impact and shearing, under abominable working condition, will cause the breakage of tooth, fracture or heavy wear, influence efficiency of breaking rock, the breakage in advance of traditionally shaped hard-metal insert remains one of principal element of restriction rock bit application life and rate of penetration.

The purpose of this utility model provides a kind of crown that guarantees enough proud exposures, is different from the special-shaped crown hard-metal insert of wedge shape, spoon shape, conisphere shape, limit wedge shape.

Embodiment: for achieving the above object, heteromorphic teeth of the present utility model bottom is a cylinder, with the cone body interference fit, the shape of cross section on crown top is a dumb-bell shape, the spherical part of dumbbell is the half cone cylindricality along extending axially of tooth, the shank of dumbbell is wedge shape along tooth axially and perpendicular to the cross section of tooth top length direction, this cross section forms two side direction roller seating spaces on crown is vertical, the utility model has the advantages that: this tooth has the characteristics of conical tooth and two kinds of teeth of chisel teeth, both be suitable for softer stratum, also be applicable to harder, the stratum that abrasiveness is strong, because the half cone post of the hard-metal insert crown both sides of this special-shaped crown, strengthened the flexural strength of common chisel teeth, under the effect of tooth, contact to earth at the pressure of the drill, when compressive stress surpasses the strength condition of rock, the dumb-bell shape tooth top makes rock produce multidirectional crackle, and, increase along with taper crown wedging depth of stratum, crackle is expanded rapidly, after gear wheel rotates an angle, wedge shape roller seating space part produces the powerful effect of cutting of scraping to rock, and the half cone post of special-shaped crown carbide button crown both sides can play the effect that delays crown side and tooth top wearing and tearing in drilling process.

Description of drawings:

Fig. 1 is a mansion of the present utility model view.

Fig. 2 is a front schematic view of the present utility model.

Fig. 3 is a generalized section of the present utility model.

Fig. 4 is a stereogram of the present utility model.

Fig. 5 is a scheme of installation of the present utility model.

Specific implementation method: the utility model comprises tooth post 4 and crown 3, the bottom of crown 3 is a tooth post 4, tooth post 4 is cylindrical, with gear wheel 5 interference fit, crown 3 tops are tooth top 2, the shape of cross section of tooth top 2 is a dumbbell-shaped structure, the spherical part at dumbbell-shaped structure tooth top 2 two ends is the half cone column construction along extending axially of tooth, the shank of dumbbell-shaped structure is wedge structure along tooth axially and perpendicular to the cross section of tooth top length direction, this cross section crown 3 vertically on the two sides roller seating space 1 of a side direction is respectively arranged, the height of crown 3 compares more than or equal to 0.5, smaller or equal to 1 with the length of tooth post 4; Pass through the influence that place's stress is concentrated mutually in order to reduce crown 3 each face, with crown 3 each face place's of passing through arc transition mutually, on the whole, crown 3 is composite constructions that seamlessly transit; In order to improve the abrasion resistance of this special-shaped crown carbide button, the manufactured materials of its crown 3 has two kinds: first kind is the carbide alloy crown of WC+Co, and second kind is the compound crown in diamond top layer; The outside diameter of the hard-metal insert tooth post 4 of this special-shaped crown is from φ 14～φ 35, exposure and buried depth all≤1, key groove is 60 °～90 °, roller seating space 1 degree of depth of crown 3 cross sections is 1～5mm; One taper counterbore 7 is arranged at tooth post 4 bottoms, and counterbore 7 can be circular, also can be polygon, and counterbore 7 is used for storing the air that is sealed in the permanent tooth process in the perforation, guarantees that tooth post 4 can be depressed into the bottom of perforation and save the tooth material; This special-shaped hard-metal insert can adopt the powder metallurgy method manufacturing, it also can be process whole on the surface of crown 3 or under the top of crown 3 employing high pressure and high temperature, covering a layer thickness is 0.5～1.2mm polycrystalline diamond composite material, and 6 is tooth pawls among the figure.

Claims

1. a special-shaped crown hard-metal insert comprises tooth post and crown, it is characterized in that:

The cross section of a. described crown top tooth top is a dumbbell-shaped structure, the spherical part at dumbbell-shaped structure two ends is the half cone column construction along extending axially of tooth, the shank of dumbbell-shaped structure is wedge structure along tooth axially and perpendicular to the cross section of tooth top length direction, crown vertically on the two sides roller seating space of a side direction is respectively arranged;

B. the length of the height of described crown and tooth post is more than or equal to 0.5, and smaller or equal to 1, the key groove of dumbbell shank longitudinal cross-section is 60 °～90 °;

A conical counterbore is arranged at the bottom of c. described tooth post.

2. a kind of special-shaped crown hard-metal insert according to claim 1, it is characterized in that: described conical counterbore can be circular, also can be polygonal.

3. a kind of special-shaped crown hard-metal insert according to claim 1, it is characterized in that: the manufactured materials of described crown can be WC+Co, also can be the polycrystalline diamond composite material that coats 0.5mm～1.2mm on the crown surface.