CN2743526Y

CN2743526Y - Top deviating wedge shaped teeth

Info

Publication number: CN2743526Y
Application number: CN 200420076969
Authority: CN
Inventors: 樊孝兵; 陈东方
Original assignee: Kingdream PLC
Current assignee: Sinopec Oilfield Equipment Corp
Priority date: 2004-10-15
Filing date: 2004-10-15
Publication date: 2005-11-30
Anticipated expiration: 2014-10-15

Abstract

The utility model relates to top deviating wedge shaped teeth of alloy material, which is used on the roller bits for petroleum, natural gas, and geological well drilling as well as on the drill bits. The utility model comprises a denticle and a corona. The corona consists of a tapered crown base and two correspondingly arranged wedge surfaces which comprise a big wedge surface and a small wedge surface; the included angle between the big wedge surface and the shaft line of the denticle is greater than the included angle between the small wedge surface and the shaft line of the denticle; the big wedge surface and the small wedge surface intersect at the addendum and transit through hollows. The utility model has the advantages that the cutting edges formed by the intersection of the big wedge surface and the crown base are longer, thus enhancing the cutting efficiency of the wedge shaped teeth, reducing the abrasion of the teeth, and extending the service life; the conical surface, the small wedge surface and the tip radius surface are provided with composite layers of diamond, therefore, the abrasive resistance of the surfaces is higher than the abrasive resistance of the big wedge surface; in the process of cutting the well casing, the cutting edges formed by the intersection of the big wedge surface and the conical surface have self-sharpening action, thereby, further enhancing the cutting efficiency of the teeth.

Description

Inclined to one side top chisel teeth

Technical field

The utility model relates to a kind of inclined to one side top chisel teeth made from alloy material that is used on oil, natural gas and the instruments such as geological drilling rock bit and mining bore bit.

Background technology

In the prior art, use more cutting teeth to be circular cone tooth and chisel teeth in the rock bit, chisel teeth is mainly used in gear wheel back cone and outer rows of teeth intersection, and during rock bit work, chisel teeth is with one of them wedge surface scraping borehole wall.Two wedge surfaces of existing chisel teeth are symmetrical, promptly two wedge surfaces equate with the angle of denticle axis, the area of two wedge surfaces equates, cutting edge is also identical, cut the chisel teeth of the borehole wall like this for wedge surface of main usefulness, exist cutting and share inadequately rationally evenly, thereby the stock-removing efficiency of chisel teeth is lower, the problem that application life is short.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of cutting to share rationally at the deficiency of above-mentioned prior art existence, and application life is longer, the inclined to one side top chisel teeth that stock-removing efficiency is higher.

The utility model is that the technical scheme that problem adopted of the above-mentioned proposition of solution is: include denticle 1 and crown 4, described crown is made of taper crown base and corresponding two wedge surfaces that are provided with, its difference is that described two wedge surfaces comprise big wedge surface 2 and little wedge surface 5, the angle of big wedge surface and denticle axis is greater than the angle of little wedge surface and denticle axis, and large and small wedge surface intersects at tooth top and by arc surface 3 transition.

Press such scheme, the angle of described big wedge surface and denticle axis is 45～85 °, and the angle of little wedge surface and denticle axis is 40～5 °, and described taper crown base is conical crown base or conisphere shape crown base; Described denticle, crown are made by carbide alloy, are covered with the diamond composite bed on the taper surface of carbide alloy crown, little wedge surface and outside circle cambered surface.

The beneficial effects of the utility model are: 1, the area of big wedge surface is bigger, the cutting edge that intersects formation with the crown base conical surface is longer, when its as the cutting borehole wall main wedge surface the time, not only the cutting face is bigger, and the cutting task on the unit area reduces relatively, thereby improved the stock-removing efficiency of chisel teeth, and the wearing and tearing of tooth reduce, and prolong application life; 2, owing to have the diamond composite bed on the conical surface, little wedge surface and the outside circle cambered surface, the abrasion resistance of these faces is than big wedge surface height, like this in cutting borehole wall process, the big wedge surface and the conical surface intersect formed cutting edge and have sharping by oneself affect, make chisel teeth keep its sharp keen property, thereby further strengthen the stock-removing efficiency of tooth.

Description of drawings

Fig. 1 is the elevation of an embodiment of the utility model.

Fig. 2 is the vertical view of Fig. 1.

Fig. 3 is the left view of Fig. 1

Fig. 4 is the stereogram of an embodiment of the utility model.

The specific embodiment

Further specify embodiment of the present utility model below in conjunction with accompanying drawing, the upper end that includes a columniform denticle 1, denticle has crown 4, described crown comprises conical crown base, both sides corresponding on crown base are arranged with big wedge surface 2 and little wedge surface 5, the angle α of wherein big wedge surface and denticle axis 8 is 50～70 °, extended upward by the crown base bottom side, it has bigger wedge surface area, and is longer with the cutting edge 7 that the taper crown base forms; The angle β of little wedge surface and denticle axis 8 is 40～20 °, and correspondence is located at the opposite side of crown base, and the wedge surface area is less; Large and small wedge surface intersects at tooth top, connects transition by arc surface 3, and whole chisel teeth is made by Hardmetal materials.For further strengthening the cutting ability and the abrasion resistance of chisel teeth, on little wedge surface 5, taper seat 6 and the outside circle cambered surface 3 of crown, be covered with the diamond composite bed.Because the diamond composite bed has more high rigidity, therefore, can make the formed cutting edge of big wedge surface and taper seat have sharping by oneself affect.

Claims

1, a kind of inclined to one side top chisel teeth, include denticle and crown, described crown is made of taper crown base and corresponding two wedge surfaces that are provided with, it is characterized in that described two wedge surfaces comprise big wedge surface and little wedge surface, the angle of big wedge surface and denticle axis is greater than the angle of little wedge surface and denticle axis, and large and small wedge surface intersects at tooth top and by the arc surface transition.

2, by the described inclined to one side top of claim 1 chisel teeth, the angle that it is characterized in that described big wedge surface and denticle axis is 45～85 °, and the angle of little wedge surface and denticle axis is 40～5 °.

3, by claim 1 or 2 described inclined to one side top chisel teeths, it is characterized in that described taper crown base is conical crown base or conisphere shape crown base.

4, by claim 1 or 2 described inclined to one side top chisel teeths, it is characterized in that described denticle, crown made by carbide alloy, on the taper surface of carbide alloy crown, little wedge surface and outside circle cambered surface, be covered with the diamond composite bed.

5, by the described inclined to one side top of claim 2 chisel teeth, the angle that it is characterized in that big wedge surface and denticle axis is 50～70 °, and the angle of little wedge surface and denticle axis is 40～20 °, and correspondence is located at the opposite side of crown base.