Edge-warping diamond compact and drill bit thereof

Abstract

The invention relates to an edge-warping diamond compact and a drill bit thereof. The warping edge structure forms a sharper cutting edge on the edge of the compact, the scraping effect is improved after the compact acts on the surface of a rock, the overall cutting effect and efficiency can be greatly improved for rocks with the hardness higher than the middle grade, and after the compact is installed on a drill bit, an anchor rod drill bit and a coring drill bit can be formed. The drill bit with various structures and functions, such as a centerless drill bit, is good in cutting effect and high in speed.

Description

Technical Field

[0001] The invention relates to the technical field of diamond composite sheets and drill bits, and in particular to a warped edge diamond composite sheet and a drill bit thereof. Background Art

[0002] Polycrystalline composite sheets are widely used in the end of drill bits, in various mining industries, and in engineering drilling. They are mainly used for rock cutting. The edge of the composite sheet is generally an inclined chamfered surface. When the composite sheet is installed on the drill bit, the chamfered surface and the contact surface of the cut rock are arranged at a certain angle. The chamfered surface was originally used to protect the edge of the composite sheet. In actual use, the chamfered surface will cause sliding on the rock contact surface, especially when cutting rocks with a hardness of medium or above. Sliding causes slow cutting speed and poor cutting effect. As the strength of the composite piece itself increases, it is necessary to improve the edge structure of the composite piece to increase the cutting speed and efficiency of the drill bit, especially when cutting rocks with a hardness of medium or above. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a warped edge diamond composite sheet and a drill bit thereof.

[0004] The technical solution of the present invention is: a warped edge diamond composite sheet, the upper part is a polycrystalline diamond layer, the lower part is a cemented carbide layer, a conical chamfered surface is provided on the edge of the diamond layer, and the edge of the conical chamfered surface is provided with an upwardly turned warped edge. After the composite sheet is installed on the drill bit, the warped edge forms a scraping effect when cutting the rock. After being installed on the drill bit, the drilling efficiency and speed of the drill bit will be significantly improved, especially for rocks with a hardness of medium or above, the drilling speed is more significantly improved.

[0005] Preferably, the edge of the warped edge is provided with a secondary micro-chamfer or micro-rounded corner, and the micro-chamfer or micro-rounded corner reduces the stress concentration at the edge of the warped edge to avoid the edge of the warped edge from cracking.

[0006] Preferably, the edge of the polycrystalline diamond layer is provided with a plurality of teeth, and the teeth are located at the cutting position after the drill bit is installed, which can further improve the cutting effect.

[0007] Preferably, the inner side surface of the warped edge and the chamfer are transitioned to an arc bottom surface or a flat bottom surface.

[0008] A drill bit comprises a drill bit base part and a polycrystalline diamond composite sheet mounted on a steel body, wherein the composite sheet is any one of claims 1-4.

[0009] Preferably, the drill bit base is an anchor drill bit base.

[0010] Preferably, the drill bit matrix is ​​a coring drill bit matrix.

[0011] Preferably, the drill bit base is a centerless drill bit base.

[0012] The warped edge diamond composite sheet and its drill bit of the present invention have a warped edge structure that forms a sharper cutting edge at the edge of the composite sheet, which improves the scraping effect after acting on the rock surface during use, and can greatly improve the overall cutting effect and efficiency for rocks with a hardness of medium or above. After the composite sheet is installed on the drill bit, drill bits with various structures and functions such as anchor drill bits, coring drill bits, and centerless drill bits can be formed, forming a drill bit with good cutting effect and high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of the warped edge diamond composite sheet in Example 1; Figure 2 for Figure 1 AA cross-sectional structural diagram; Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure; Figure 4 This is a schematic diagram of the main structure of the warped edge diamond composite sheet in Example 3; Figure 5 A three-dimensional diagram of an anchor drill bit using the warped edge diamond composite sheet; Figure 6 A three-dimensional diagram of a centerless drill bit using the warped edge diamond composite sheet; Figure 7 A three-dimensional diagram of a core drill bit using the warped edge diamond composite sheet; Figure 8 This is a schematic diagram of a warped diamond composite sheet in Example 1; Fig. 9 This is a schematic diagram of a warped diamond composite sheet in Example 2; In the figure: 1. cemented carbide layer, 2. polycrystalline diamond layer, 3. conical chamfered surface, 4. warped edge, 5. transition surface, 6. micro-rounded corner, 7. secondary micro-chamfered corner, 8. tooth mouth, 101. warped diamond composite sheet, 102. anchor drill bit base, 103. centerless drill bit base, 104. hollow drill bit base. DETAILED DESCRIPTION

[0014] Example 1: See Figure 1-3The picture shows a warped diamond composite sheet, with a polycrystalline diamond layer on the top and a cemented carbide layer on the bottom. A conical chamfered surface is provided on the edge of the diamond layer, and an upward-turned warped edge is provided on the edge of the conical chamfered surface. When the composite sheet is installed on the drill bit, the warped edge forms a scraping effect when cutting the rock. After being installed on the drill bit, the drilling efficiency and speed of the drill bit will be significantly improved, especially for rocks with a hardness of medium or above. The drilling speed is more significantly improved. The actual picture of the composite sheet is as follows Figure 8 .

[0015] Example 2: See Figure 1-3 The second embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that: the edge of the warped edge is provided with a slightly rounded corner, such as Figure 2 Partially enlarged image A shows that the micro-rounded corners reduce stress concentration at the edge of the warping edge and prevent the edge of the warping edge from cracking. Fig. 9 .

[0016] The fillet can also be replaced by a secondary micro chamfer, such as Figure 2 Partial enlargement of Figure B.

[0017] Example 3: See Figure 4 , Embodiment 3 is basically the same as Embodiment 1, and the similarities are not repeated here, and the differences are: The edge of the polycrystalline diamond layer is provided with a plurality of teeth, and the teeth are located at the cutting position after the drill bit is installed, which can further improve the cutting effect.

[0018] In the above-mentioned embodiments 1 to 3, the inner side surface of the warped edge and the chamfer are transitioned to a circular arc bottom surface or a flat bottom surface, so as to solve the problem of rapid discharge of stone chips. More embodiments can be formed.

[0019] Example 4: See Figure 5 The drill bit in the figure comprises a drill bit base part and a polycrystalline diamond composite sheet mounted on a steel body, wherein the composite sheet is any one of the above-mentioned ones. The drill bit base is an anchor drill bit base.

[0020] Example 5: See Figure 6 The drill bit in the figure comprises a drill bit base part and a polycrystalline diamond composite sheet mounted on a steel body, wherein the composite sheet is any one of the above-mentioned. The drill bit base is a centerless drill bit base.

[0021] Example 6: See Figure 7 The drill bit in the figure comprises a drill bit base part and a polycrystalline diamond composite sheet mounted on a steel body, wherein the composite sheet is any one of the above-mentioned ones. The drill bit base is a core drill bit base.

Claims

1. A warped edge diamond composite sheet, the upper part is a polycrystalline diamond layer, the lower part is a cemented carbide layer, characterized by: A conical chamfered surface is arranged at the edge of the diamond layer, and an upwardly turned warped edge is arranged at the edge of the conical chamfered surface.

2. The warped edge diamond composite sheet according to claim 1, characterized in that: The edge of the warped edge is provided with a secondary micro chamfer or a micro rounded corner.

3. The warped edge diamond composite sheet according to claim 1, characterized in that: The edge of the polycrystalline diamond layer is provided with a plurality of tooth openings.

4. The warped edge diamond composite sheet according to claim 1, characterized in that: The inner side surface of the warped edge and the chamfer are transitioned to an arc bottom surface or a flat bottom surface.

5. A drill bit, comprising a drill bit base portion and a polycrystalline diamond composite sheet mounted on a steel body, characterized in that: The composite sheet is any one of claims 1-4.

6. The drill bit according to claim 5, characterized in that: The drill bit matrix is ​​an anchor drill bit matrix.

7. The drill bit according to claim 5, characterized in that: The drill bit matrix is ​​a coring drill bit matrix.

8. The drill bit according to claim 5, characterized in that: The drill bit base is a centerless drill bit base.

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