Mixed cutting type tricone bit

Abstract

The invention belongs to the technical field of roller cone bits, and particularly relates to a mixed cutting type tricone bit which comprises a roller cone, main cutting teeth are embedded in a base body of the roller cone, the main cutting teeth are composed of transverse cutting teeth and longitudinal cutting teeth, and the transverse cutting teeth and the longitudinal cutting teeth are transversely and longitudinally embedded in the base body of the roller cone at intervals. The main cutting teeth of the cone are transversely and longitudinally embedded at intervals, the tooth crest distance is small, drill jumping is not prone to occurring, the cone rotates stably, the hard alloy teeth are prevented from being broken and broken, the cone rotates stably, and meanwhile a bearing sealing system is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of roller drill bits, and in particular relates to a mixed cutting type three-roller drill bit. Background Art

[0002] The rock breaking mechanism of the three-cone drill bit mainly relies on the impact and crushing effect of the carbide teeth embedded on the cone to cut and crush the rock to form the footage. The analysis of the characteristics of rock crushing during drilling shows that "pressing crushing" plays a major role in the crushing process. The teeth of the cone drill bit press into the rock under the axial load (impact dynamic load process), causing the rock under the tooth surface to produce volume crushing and form pits; due to the rolling effect of the teeth along the bottom of the well, the crushed pits continue to expand to form footage. The existing three-cone drill bit is embedded with carbide teeth in the cone longitudinally (axially). Affected by the hole bottom distance, the tooth tops are far apart. During drilling, a series of raised ridges are formed at the bottom of the well, which has a great impact on the mechanical drilling speed and slows down the footage speed. The three-cone drill bit drilling mainly relies on the impact and crushing effect of the carbide embedded on the cone to cut and crush the rock to form the footage. The tooth top distance is far, and it is very easy to break and chip the teeth. Summary of the invention

[0003] The object of the present invention is to provide a hybrid cutting type three-cone drill bit to solve the problems existing in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a mixed cutting three-roller drill bit, comprising a roller, wherein a main cutting tooth is embedded in a base of the roller, wherein the main cutting tooth is composed of a transverse cutting tooth and a longitudinal cutting tooth, and the transverse cutting tooth and the longitudinal cutting tooth are embedded in the base of the roller with transverse and longitudinal intervals.

[0005] Preferably, the main cutting teeth are provided in two circles.

[0006] Preferably, auxiliary cutting teeth are respectively provided on the top and the bottom of the cone.

[0007] Preferably, the axial projection of the transverse cutting tooth is perpendicular to the axis of the cone.

[0008] Preferably, the axial projection of the cone of the longitudinal cutting tooth is parallel to the axis of the cone.

[0009] The beneficial effects of the present invention are as follows: the main cutting teeth of the cone are inlaid with intervals in the horizontal and vertical directions, the tooth top spacing is small, the drill is not easy to jump, the cone rotates smoothly to prevent the occurrence of fracture and breakage of the cemented carbide teeth, and the cone rotates smoothly while also protecting the bearing sealing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0011] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0012] like Figure 1 As shown, a hybrid cutting three-cone drill bit comprises a cone 1, a main cutting tooth 2 is inlaid on the base of the cone, and the main cutting tooth is composed of a transverse cutting tooth 3 and a longitudinal cutting tooth 4, and the transverse cutting tooth and the longitudinal cutting tooth are inlaid on the base of the cone through transverse and longitudinal intervals. The main cutting teeth of the cone are inlaid in transverse and longitudinal intervals, and the tooth top spacing is small, which is not easy to jump the drill, and the cone rotates smoothly to prevent the fracture and breakage of the cemented carbide teeth. Specifically, the main cutting teeth are two circles. Auxiliary cutting teeth are respectively arranged at the top and bottom of the cone, and the auxiliary cutting teeth. The axis projection of the transverse cutting tooth is perpendicular to the axis of the cone. The axis projection of the cone of the longitudinal cutting tooth is parallel to the axis of the cone. The main cutting teeth 2 of the cone are inlaid in transverse and longitudinal intervals, and no ridge is formed at the bottom of the well during drilling. Moreover, the fracturing cracks of the cemented carbide teeth that crush the rock formation are cross-sectionally and transversely, which makes it easier to crush the rock formation, and the penetration is faster, which can greatly improve the excavation efficiency. At the same time, it also overcomes the situation of local stress, alleviates the impact load to a great extent, has good safety, high rock breaking efficiency, and is suitable for long-distance, long-term, high mechanical drilling speed continuous operation.

[0013] The shapes of the transverse cutting teeth and the longitudinal cutting teeth of the main cutting teeth of the gear can be the same or different, as long as the teeth are arranged at intervals in the transverse and longitudinal directions.

[0014] 1. Manufacturing of transverse carbide teeth embedded in the new hybrid cutting three-cone drill bit:

[0015] A. Manufacture the pressing mold according to the design drawings;

[0016] B. Mix tungsten carbide powder and cobalt powder according to the design drawings;

[0017] C. Granulation;

[0018] D. Sintering;

[0019] E. Surface polishing;

[0020] F. Inspection;

[0021] 2. Equipped with transverse carbide teeth embedded in the new hybrid cutting three-cone drill bit.

[0022] A. Drill and ream the tooth holes on the outer surface of the cone according to the design drawings;

[0023] B. Measure the diameter of the tooth holes;

[0024] C. Grind the outer diameter of the new type of thorn-shaped carbide tooth inlay according to the hole diameter;

[0025] D. Press the transverse carbide tooth inlay of the new hybrid cutting three-cone drill bit into the tooth hole of the cone to complete the assembly.

[0026] Finally, assemble the cone on the three-cone drill bit and it can be used.

[0027] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A hybrid cutting type three-cone drill bit, comprising a cone, wherein the base of the cone is inlaid with main cutting teeth, characterized in that: The main cutting teeth are composed of transverse cutting teeth and longitudinal cutting teeth, and the transverse cutting teeth and longitudinal cutting teeth are embedded on the base of the gear wheel through transverse and longitudinal intervals.

2. The hybrid cutting type three-cone drill bit according to claim 1, characterized in that: The main cutting teeth are divided into two circles.

3. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: Auxiliary cutting teeth are respectively arranged on the top and the bottom of the cone.

4. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: The axial projection of the transverse cutting tooth is perpendicular to the axis of the cone.

5. The hybrid cutting type tri-cone drill bit according to claim 1, characterized in that: The axial projection of the cone of the longitudinal cutting tooth is parallel to the axis of the cone.

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