CN204492666U

CN204492666U - Reinforced ball tooth

Info

Publication number: CN204492666U
Application number: CN201520032050.8U
Authority: CN
Inventors: 仇周鹏; 仇胜; 王晓胜
Original assignee: YUEQING NANFANG CEMENTED CARBIDE CO Ltd
Current assignee: YUEQING NANFANG CEMENTED CARBIDE CO Ltd
Priority date: 2015-01-19
Filing date: 2015-01-19
Publication date: 2015-07-22
Anticipated expiration: 2025-01-19

Abstract

The utility model discloses a kind of reinforced ball tooth, include tooth post and crown two parts, described crown comprises crown base and sphere tooth top, crown side is smooth extrados, described extrados is transitioned into sphere tooth top, and be inner concave arc surface at smooth extrados offside, crown base is formed by from tooth post to the taper cambered surface of sphere tooth top transition, described extrados ecto-entad is respectively equipped with diamond layer and three tempered martensite layers, known, outer layer of diamond is utilized in the endface position maximum by cutting force, can under the prerequisite of identical gauge contact area, ensure the uniform force of the flank of tooth, and the ball tooth on this inclined top, stronger flexural stress will be subject at bending outer convex globoidal, its toughness is ensure that by the internal layer of three tempered martensites, in order to extend the application life of ball tooth.

Description

Reinforced ball tooth

Technical field

The utility model relates to a kind of carbide button in oil, natural gas and geological drilling rock bit, is related specifically to a kind of reinforced ball tooth.

Background technology

In the prior art, the blunt conical-ended shape insert in rock bit is mainly used in Drilling comparatively hard formation.In order to the stratum that fragmentation is harder, need to apply larger the pressure of the drill, the service load therefore acted on blunt conical-ended shape insert is also larger.Rock bit is when underground work, and carbide button varied angle wedging stratum, contacts stratum and leave in the process of stratum to carbide button from carbide button, and the wedging angle of carbide button is in constantly change.Crown due to blunt conical-ended shape insert adds that spherical crown tooth top is formed by frustum, and their center line is straight line and overlaps with the center line of tooth post.Therefore, in the process of existing blunt conical-ended shape insert broken formation, can not vertical wedging stratum, it is bigger than normal to add service load, and not only efficiency of breaking rock is lower, and easily makes carbide button damage.

Be 200920227906.1 at application number, name is called in the Chinese patent of heading tooth partially, ball tooth can be made to attack with under low-angle when boring geological stratification although disclose one, but due to the crown that it is bending, make its at work the back cambered surface of evagination be very easy to be subject to excessive flexural stress and rupture.

Utility model content

For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of reinforced ball tooth, by this reinforced ball tooth, make it operationally, ball tooth can be less than general conical ball dental transition angle bore ground thus ensure its bore ground efficiency while, its working strength can be met again, thus ensure effective working life.

For achieving the above object, the utility model provides following technical scheme: a kind of reinforced ball tooth, include tooth post and crown two parts, described crown comprises crown base and sphere tooth top, crown side is smooth extrados, and described extrados is transitioned into sphere tooth top, and is inner concave arc surface at smooth extrados offside, crown base is formed by from tooth post to the taper cambered surface of sphere tooth top transition, and described extrados ecto-entad is respectively equipped with diamond layer and three tempered martensite layers.

Preferably, described tooth post is that the high strength cemented carbide of tungstenic is shaping.

The utility model is set to further: the thickness of described diamond layer is 0.5-1mm, and the thickness of three tempered martensite layers is 2-3mm.

The utility model is set to further: described inner concave arc surface ecto-entad is provided with high molecular abrasion-proof ceramic layer and described three tempered martensite layers.

Preferably, the thickness of described wearing layer is 100-200um.

Compared with prior art, the utility model has the advantage of: compared with common ball tooth, at the field of conjugate action (inner concave arc surface) by the transition of high molecular abrasion-proof ceramic layer, simultaneously, outer layer of diamond is utilized in the endface position maximum by cutting force, can under the prerequisite of identical gauge contact area, ensure the uniform force of the flank of tooth, and the ball tooth on this inclined top, stronger flexural stress will be subject at bending outer convex globoidal, its toughness is ensure that, in order to extend the application life of ball tooth by the internal layer of three tempered martensites.

Accompanying drawing explanation

Fig. 1 is the phantom drawing of the utility model reinforced ball tooth embodiment.

In figure, 1, tooth post; 2, crown; 21, diamond layer; 22, three tempered martensite layers; 23, high molecular abrasion-proof ceramic layer.

Detailed description of the invention

With reference to accompanying drawing 1, the embodiment of the reinforced ball tooth of the utility model is described in further details:

The present embodiment includes tooth post 1 and crown 2 two parts, described crown 2 comprises crown base and sphere tooth top, crown 2 side is smooth extrados, described extrados is transitioned into sphere tooth top, and be inner concave arc surface at smooth extrados offside, crown base is formed by from tooth post 1 to the taper cambered surface of sphere tooth top transition, described extrados ecto-entad is respectively equipped with diamond layer 21 and three tempered martensite layers 22, the skin of described sphere tooth top is set to diamond layer 21, the thickness of described diamond layer is 0.5-1mm, the thickness of three tempered martensite layers is 2-3mm, described inner concave arc surface ecto-entad is provided with high molecular abrasion-proof ceramic layer 23 and three tempered martensite layers 22.

Three tempered martensites: first stage, 80-200 DEG C of martensite decomposes, when steel is heated to about 80 DEG C, its interior atoms mobility increases to some extent, and the supersaturation carbon in martensite starts progressively to separate out with the form of carbide, in martensite, the degree of super saturation of carbon constantly reduces, meanwhile, distortion of lattice degree also weakens, and internal stress decreases, this go out the tissue that forms of the lower martensite of degree of super saturation and superfine carbide, be called tempered martensite; Second stage, 200-300 DEG C of retained austenite is decomposed, when steel heating-up temperature is more than 200 DEG C, martensite continues to decompose, and meanwhile, retained austenite also starts to decompose, change lower bainite or tempered martensite into, during to 300 DEG C, the decomposition of retained austenite terminates substantially; Phase III, the formation of 300-400 DEG C of cementite, steel is at this one-phase of tempering, the Carbides Transformation of separating out from supersaturated solid solution is granular cementite (Fe3C), when temperature reaches 400 DEG C, in αsolidsolution, oversaturated carbon is separated out substantially completely, and α-Fe lattice recovers normal, change ferrite into by supersaturated solid solution, the internal stress of steel is removed substantially.

Having more said structure and accompanying drawing, be set to bias by crown 2 and tooth post 1, making it when piercing hard earth's surface, wedging angle reduces, and is more prone to pierce earth's surface, improves chip efficiency; By arranging diamond layer 21 at the skin of sphere tooth top and extrados, due to the rigid characteristic of diamond layer 21 own, make, when boring ground, to be more prone to; By being arranged on three tempered martensite layers 22 of internal layer, making ball tooth when bearing larger impact, can be good at bearing its flexural stress be subject to, be not easy to damage, substantially increase application life; Further, by being arranged on the high molecular abrasion-proof ceramic layer 23 of inner concave arc surface, make in the operation of geological drilling, when inner concave arc surface is subject to bonding, it is more wear-resisting, further improves result of use and life-span.

The above is only preferred embodiment of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. a reinforced ball tooth, include tooth post and crown, described crown comprises crown base and sphere tooth top, crown side is smooth extrados, described extrados is transitioned into sphere tooth top, and is inner concave arc surface at smooth extrados offside, and crown base is by forming from tooth post to the taper cambered surface of sphere tooth top transition, it is characterized in that, described extrados ecto-entad is respectively equipped with diamond layer and three tempered martensite layers.

2. reinforced ball tooth according to claim 1, is characterized in that, the thickness of described diamond layer is 0.5-1mm, and the thickness of three tempered martensite layers is 2-3mm.

3. reinforced ball tooth according to claim 2, is characterized in that, described inner concave arc surface ecto-entad is provided with high molecular abrasion-proof ceramic layer and described three tempered martensite layers.