Moon blade type composite sheet

Abstract

The utility model provides a moon blade type composite sheet. The moon blade type composite sheet comprises a composite sheet main body, an arc-shaped groove and an attack surface, the number of the arc-shaped grooves is three, the arc-shaped grooves are symmetrically arranged along the edge of the end face of the clad sheet body, and the three arc-shaped grooves form three crescent blade edges on the end face of the clad sheet body. The three crescent blade edges are not intersected, and the edge of the end face of the clad sheet body between every two crescent blade edges forms a plough type attack face. The attack surface is provided with double chamfers, and the double chamfers comprise a basic chamfer and an extending chamfer. A single plane rock breaking mode is changed into an extrusion rock breaking mode through a plough type attack face, heat generated by rock accumulated on the working surface after cutting is reduced, upward returning of rock debris is accelerated, and the drilling efficiency is improved. By adding the double chamfers, after a single chamfer is abraded, the other chamfer can effectively continue to work, and the position complementing function is achieved. Therefore, the durability of the composite sheet is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of drilling tools, especially to a moon blade type composite piece. BACKGROUND

[0002] The conventional PDC drill bit adopts a plane composite piece, and its rock breaking mode is "plane" type cutting, which has the following defects:

[0003] Rock debris accumulation and high temperature failure: after rock breaking, rock debris is easy to accumulate on the surface of the composite piece, friction generates heat, causing thermal damage to the composite piece and shortening the service life.

[0004] Single chamfer poor impact resistance: the conventional composite piece adopts a single layer chamfer, which cannot be replaced after chamfer wear, has weak impact resistance, and is easy to be passivated and fail.

[0005] Insufficient formation adaptability: in soft and hard alternating strata, the plane composite piece has low penetration efficiency and is easy to be eccentrically ground or cracked.

[0006] Therefore, there is an urgent need for a composite piece structure with efficient rock breaking, impact resistance and heat dissipation optimization. SUMMARY

[0007] The utility model aims to provide a moon blade type composite piece, which solves the problems of rock debris accumulation, high temperature failure and poor impact resistance of the conventional composite piece through "plow" type attack surface and double chamfer design, and improves the drilling efficiency and drill bit life.

[0008] The utility model is implemented by the following technical scheme: a moon blade type composite piece, characterized by comprising a composite piece main body, an arc-shaped groove and an attack surface; a plurality of arc-shaped grooves are symmetrically arranged on the edge of the end face of the composite piece main body, the arc-shaped grooves form moon blade edges on the end face of the composite piece main body, and the attack surfaces are formed between adjacent moon blade edges; each attack surface is provided with a double chamfer structure.

[0009] Further, the arc-shaped curvature radius of the arc-shaped groove is 12mm, the groove depth is 1.4mm, and the central angle between adjacent arc-shaped grooves is 60°.

[0010] Further, the double chamfer structure comprises a 45° basic chamfer close to the base and a 15° extension chamfer arranged outside the basic chamfer, and the radial extension length of the extension chamfer is greater than that of the basic chamfer.

[0011] Further, the axial height of the basic chamfer is 0.34mm, and the axial height of the extension chamfer is 0.3mm.

[0012] Further, the number of arc-shaped grooves is three.

[0013] Further, the basic chamfer is only arranged outside the arc-shaped groove 2, and the extension chamfer 5 is arranged outside and inside the arc-shaped groove 2.

[0014] Further, the arc-shaped groove is processed by first determining a center circle on the end face of the composite piece main body, then determining three circular arcs tangent to the center circle, making 20° beveling surfaces along the circular arcs, and forming the arc-shaped grooves.

[0015] The composite piece has the beneficial effects that:

[0016] The rock breaking mode is changed from single plane rock breaking to extrusion rock breaking through the "plow" type attack surface, heat generation of rock accumulation on the working surface after cutting is reduced, rock cuttings are returned faster, and drilling efficiency is improved.

[0017] By increasing the double chamfers, after wear of the single chamfer, the other chamfer can effectively continue to work, and the function of "position replacement" is achieved, so that the durability of the composite piece is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor.

[0019] Figure 1 It is a schematic view of a crescent blade type composite piece;

[0020] Figure 2 It is Figure 1 It is a sectional view along A-A direction;

[0021] In the figure, 1 is a composite piece main body, 2 is an arc-shaped groove, 3 is an attack surface, 4 is a basic chamfer, 5 is an extension chamfer, and 6 is a crescent blade edge. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, a crescent-shaped composite sheet includes a composite sheet body 1, arc-shaped grooves 2, and an attack surface 3. There are three arc-shaped grooves 2, symmetrically arranged along the edge of the end face of the composite sheet body 1, forming three crescent-shaped edges 6 on the end face of the composite sheet body 1. The three crescent-shaped edges 6 do not intersect, and the edge of the end face of the composite sheet body 1 between every two crescent-shaped edges 6 forms the attack surface 3. The attack surface 3 is provided with double chamfers, including a base chamfer 4 and an extension chamfer 5. When machining the arc-shaped grooves 2, a central circle with a diameter of 8.11 mm is first determined on the end face of the composite sheet body 1. Then, three arcs with a radius of 12 (R12) are determined based on this central circle. Each arc is tangent to the central circle and is evenly distributed along a 60° angle. The arc-shaped grooves 2 are cut at a 20° angle along the arcs, with a cutting depth of 1.41 mm.

[0025] The basic chamfer 4 is a 45° chamfer with a width of 0.34mm, and the extended chamfer 5 is a 15° chamfer with a width of 0.3mm. The extended chamfer 5 is located above the basic chamfer 4. The basic chamfer 4 is only located on the outer side of the arc-shaped groove 2, while the extended chamfer 5 is located on both the outer and inner sides of the arc-shaped groove 2.

[0026] By forming three plow-shaped attack surfaces 3 on the composite blade body 1 through three crescent blade edges 6, the rock breaking method of the composite blade is changed from "surface" to "plow" to separate the cutting rock chips to both sides. This method reduces the heat generation generated by the rock chips accumulating on the surface of the composite blade after cutting, can maintain a sharper cutting edge, and maximizes drilling efficiency.

[0027] Meanwhile, the double chamfer design greatly improves the impact resistance of the composite sheet during drilling, significantly extending its lifespan and allowing the drill bit to drill deeper and farther. Even after the base chamfer 4 wears down, the extended chamfer 5 can effectively continue working, providing a "filling" function. This effectively improves the durability of the composite sheet.

[0028] The plow-shaped attack surface 3 also achieves a change from a single planar rock breaking method to a compression rock breaking method.

[0029] In the above embodiments, the basic principle and main features of the present application and the advantages of the present application are described. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, modifications and changes made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the protection scope of the claims of the present application.

Claims

1. A moon blade type composite sheet, characterized by, The application relates to a composite blade body (1), an arc-shaped groove (2) and an attack surface (3); a plurality of arc-shaped grooves (2) are symmetrically arranged on the end face edge of the composite blade body (1), the arc-shaped grooves (2) form moon blade edges (6) on the end face of the composite blade body (1), and the attack surfaces (3) are formed between adjacent moon blade edges (6); each attack surface (3) is provided with a double chamfer structure.

2. The moondrill type composite blade according to claim 1, wherein The arc-shaped groove (2) has an arc-shaped curvature radius of 12 mm, a groove depth of 1.4 mm and a central angle of 60 DEG between adjacent arc-shaped grooves (2).

3. The moondrill composite blade of claim 1, wherein, The double chamfer structure comprises a 45 DEG base chamfer (4) close to the base and a 15 DEG extension chamfer (5) arranged outside the base chamfer (4), and the radial extension length of the extension chamfer (5) is greater than that of the base chamfer (4).

4. The moondrill composite blade of claim 3, wherein, The axial height of the base chamfer (4) is 0.34 mm, and the axial height of the extension chamfer (5) is 0.3 mm.

5. The moondrill composite blade of claim 1, wherein, The number of the arc-shaped grooves (2) is three.

6. The moondrill composite blade of claim 3, wherein, The base chamfer (4) is arranged only outside the arc-shaped groove (2), and the extension chamfer (5) is arranged outside and inside the arc-shaped groove (2).

7. The moondrill composite blade of claim 5, wherein, When the arc-shaped groove (2) is machined, a center circle is first determined on the end face of the composite blade body (1), then three circular arcs tangent to the center circle are determined according to the center circle, a 20 DEG inclined cutting surface is formed along the circular arc, and the arc-shaped groove (2) is formed.

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