Three-edge non-planar cutting tooth

Abstract

The utility model relates to a three-blade non-planar cutting tooth. The whole three-edge non-planar cutting tooth is cylindrical, at least three convex ridges are arranged on the edge portion of the top face of the cutting tooth side by side, the convex ridges are arranged towards the center of the cutting tooth, slag guide grooves are formed among the convex ridges, and cutting edges are formed between the outer ends of the convex ridges and the side faces of the cutting tooth. According to the three-blade non-planar cutting teeth, the ridge-shaped structure and the rock breaking mode that a plurality of cutting blades conduct cutting at the same time are combined, so that the rock breaking efficiency is remarkably improved; the ridge-shaped structure of the convex ridge generates point load and tension-shear action to destroy the rock, so that the rock is more easily pressed into the rock, the aggressiveness is strong, larger impact load can be avoided, and the rock is more easily broken.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a three-edged non-planar cutting tooth. Background Art

[0002] PDC cutters are cutting tools made from polycrystalline diamond composite (PDC) materials. They offer exceptional hardness, wear resistance, impact resistance, and high-temperature resistance. They are widely used in high-load, high-wear cutting applications such as oil drilling, mining, concrete cutting, and tunneling, improving machining efficiency, extending tool life, and reducing production costs.

[0003] The geometry of planar PDC cutters is typically flat, which can lead to uneven distribution of cutting forces during cutting. During cutting, the tool's contact surface may be concentrated in certain areas, causing localized excessive wear and impacting tool life and cutting performance. Due to the uneven cutting forces, tool wear may be accelerated, resulting in more frequent tool changes and reduced productivity. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a three-edged non-planar cutting tooth.

[0005] The technical solution of the utility model is a three-edged non-planar cutting tooth. The cutting tooth is generally cylindrical in shape. At least three ridges are arranged side by side on the top edge of the cutting tooth, and the ridges are arranged toward the center of the cutting tooth. Slag guide grooves are formed between the ridges, and cutting edges are formed between the outer ends of the ridges and the side surfaces of the cutting tooth. The ridge structure of the ridges generates point loads and tensile shearing effects to destroy rock, making it easier to press into the rock, with strong aggressiveness, while avoiding large impact loads and more easily breaking the rock. The cutting edges are arranged at the ends of the ridges.

[0006] Preferably, the cutting teeth are arc-shaped, with the bottoms of adjacent cutting teeth touching each other; the bottoms of adjacent ridges touching each other. Multiple ridges connected in parallel can improve the rock breaking efficiency of the cutting teeth.

[0007] Preferably, the ridges are arranged at an angle, α, with the top surface of the cutting teeth, ranging from 8°≤α≤11°, with the top of the ridges connected to the top surface of the cutting teeth. This prevents friction between the top surface of the bevel cutting teeth and the rock formation, and allows the ridges and cutting edges to cut the rock formation simultaneously, thereby improving the rock-breaking efficiency of the cutting teeth.

[0008] Preferably, the three ridges are arranged in parallel, with the points where the top surfaces of the three ridges meet the top surfaces of the cutting teeth collinear, and the line connecting the three points of contact being perpendicular to the centerline of the ridges. The ridges and cutting edges are arranged side by side, enabling the cutting teeth to generate higher point loads in front of the rock, which in turn facilitates the formation of more brittle cracks within the rock, resulting in greater volumetric crushing.

[0009] Preferably, the ridges corresponding to the cutting edges in the middle are symmetrical with respect to the center plane of the cutting teeth.

[0010] Preferably, the bevel cutting teeth are further provided with two inclined facets, with the ridge disposed between the two inclined facets; the two inclined facets are symmetrically arranged in a wing-like pattern about the center plane of the middle ridge; the inclined facets are tangent to the ridges on either side. Providing the inclined facets can expose the ridge and cutting edge, thereby improving the cutting ability of the cutting teeth.

[0011] Furthermore, the top circumference of the cutting tooth is provided with a chamfer, and the cutting edge is provided at the top of the chamfer, so as to avoid stress concentration on the cutting tooth and thus avoid the collapse of the cutting tooth.

[0012] The beneficial effects of the present invention are as follows: the three-edge non-planar cutting teeth of the present invention have the following advantages:

[0013] 1. The combination of the ridge structure and the rock breaking mode in which multiple cutting edges cut simultaneously significantly improves the rock breaking efficiency.

[0014] 2. The ridge-shaped structure of the ridge generates point loads and tensile and shearing effects to destroy rocks, making it easier to press into rocks, more aggressive, and able to avoid generating large impact loads, making it easier to break rocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the three-edged non-planar cutting tooth of the utility model. Figure 1 ;

[0016] Figure 2 It is a side view of the three-edged non-planar cutting tooth of the utility model;

[0017] Figure 3 Schematic diagram of the structure of the three-edged non-planar cutting tooth of the utility model Figure 2 ;

[0018] Figure 4 It is a top view of the three-edged non-planar cutting tooth of the utility model;

[0019] Figure 5 yes Figure 4 AA cross-sectional view.

[0020] In the figure: 00. cutting tooth, 1. cutting edge, 2. ridge, 3. cut surface; α is the angle between the ridge and the top surface of the cutting tooth. DETAILED DESCRIPTION

[0021] Example 1: See Figure 1-5A three-edged non-planar cutting tooth, the cutting tooth 00 is cylindrical in shape. At least three ridges 2 are arranged side by side on the top edge of the cutting tooth 00, oriented toward the center of the cutting tooth 00. Slag guide grooves are formed between the ridges 2, and a cutting edge 1 is formed between the outer ends of the ridges 2 and the side of the cutting tooth 00. The ridge-shaped structure of the ridges 2 generates point loads and tensile shearing effects to destroy rock, making it easier to press into the rock, more aggressive, and avoid generating large impact loads, making it easier to break the rock.

[0022] The cutting edge 1 is provided at the end of the ridge 2 .

[0023] The cutting teeth 00 are arc-shaped, and the bottoms of adjacent cutting teeth 00 are connected; the bottoms of adjacent ridges 2 are connected. Multiple ridges 2 are connected in parallel, which can improve the rock breaking efficiency of the cutting teeth 00.

[0024] The ridge 2 is arranged at an angle, with an included angle α between it and the top surface of the cutting tooth 00, ranging from 8°≤α≤11°. The top of the ridge 2 is connected to the top surface of the cutting tooth 00. This prevents friction between the top surface of the bevel cutting tooth and the rock formation, and enables the ridge 2 and the cutting edge 1 to cut the rock formation simultaneously, thereby improving the rock breaking efficiency of the cutting tooth 00.

[0025] The three ridges 2 are arranged in parallel, with the top surfaces of the three ridges 2 collinear with the top surfaces of the cutting teeth 00, and the line connecting the three points of contact is perpendicular to the centerline of the ridges 2. The ridges 2 and cutting edges 1 are arranged side by side, allowing the cutting teeth 00 to generate higher point loads in front of the rock, which easily generates more brittle cracks within the rock, resulting in greater volumetric crushing.

[0026] The ridge 2 corresponding to the central cutting edge 1 is symmetrical with respect to the center plane of the cutting tooth 00 .

[0027] The bevel cutting tooth also has two inclined facets 3, with the ridge 2 positioned between them. The two facets 3 are symmetrical about the center plane of the central ridge 2 and are tangential to the ridges 2 on either side. The inclined facets 3 expose the ridges 2 and cutting edge 1, improving the cutting ability of the cutting tooth 00.

[0028] The top circumference of the cutting tooth 00 is provided with a chamfer, and the cutting edge 1 is provided at the top of the chamfer to avoid stress concentration on the cutting tooth 00 and causing the cutting tooth 00 to collapse.

[0029] The working principle of this embodiment is as follows:

[0030] The three-edge non-planar cutter 00 has smaller cutting force and smaller fluctuation of cutting force when crushing rocks than the conventional planar PDC cutter 00, which is beneficial to reducing the vibration of the drill bit when crushing brittle and hard rocks and can effectively control stick-slip vibration.

[0031] The design of the three-edged non-planar cutting tooth 00 can reduce the impact on the cutting tooth 00, thereby improving the impact resistance of the drill bit and extending the service life of the drill bit.

[0032] During the rock breaking process, in the multi-edge combined rock breaking mode, the three-edge non-planar cutting tooth 00 can generate a higher point load in front of the rock, which easily generates more brittle cracks inside the rock, resulting in larger volume crushing.

[0033] Example 2: Example 2 is essentially the same as Example 1, and the similarities are omitted. The differences are: the cutting edge 1 is triangular, and the top of the ridge 2 is arc-shaped. The triangular cutting edge 1 further enhances the small-scale rock-breaking capability of the cutting tooth 00, while the arc-shaped ridge 2 reduces the impact on the cutting tooth 00.

Claims

1. A three-edged non-planar cutting tooth, characterized in that: The cutting tooth is cylindrical as a whole, and at least three ridges are arranged side by side on the edge of the top surface of the cutting tooth. The ridges are arranged toward the center of the cutting tooth, slag guide grooves are formed between the ridges, and a cutting edge is formed between the outer end of the ridge and the side of the cutting tooth.

2. The three-edged non-planar cutting tooth according to claim 1, characterized in that: The cutting teeth are arc-shaped, and the bottoms of adjacent cutting teeth are connected; the bottoms of adjacent ridges are connected.

3. The three-edged non-planar cutting tooth according to claim 1, characterized in that: The convex ridge is arranged obliquely, and the angle α between the convex ridge and the top surface of the cutting tooth is 8°≤α≤11°, and the top of the convex ridge is connected to the top surface of the cutting tooth.

4. The three-edged non-planar cutting tooth according to claim 1, characterized in that: The three ridges are arranged in parallel, the top surfaces of the three ridges and the contact points of the cutting tooth top surface are collinear, and the line connecting the three contact points is perpendicular to the center line of the ridges.

5. The three-edged non-planar cutting tooth according to claim 1, characterized in that: The ridges corresponding to the cutting edges in the middle are symmetrical with respect to the center plane of the cutting teeth.

6. The three-edged non-planar cutting tooth according to claim 1, characterized in that: The cutting teeth are also provided with two inclined cut surfaces, with a ridge provided between the two inclined cut surfaces; the two inclined cut surfaces are symmetrically arranged in a wing shape about the central plane of the middle ridge; the inclined cut surfaces are tangent to the ridges on both sides.

7. The three-edged non-planar cutting tooth according to any one of claims 1 to 6, characterized in that: The top circumference of the cutting tooth is provided with a chamfer, and the cutting edge is provided at the top of the chamfer.

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