CN218882156U - Hard alloy matrix and polycrystalline diamond hard alloy composite sheet - Google Patents

Abstract

The utility model discloses a cemented carbide substrate and a polycrystalline diamond cemented carbide composite sheet. The end surface of the cemented carbide substrate is provided with a groove approximately in the shape of a regular polygon, concentric with the end surface, and several corners of the regular polygon respectively extend to Outside the edge of the end face, the end face is divided into several crescent-shaped protrusions; the polycrystalline diamond layer is sintered and embedded in the cemented carbide matrix corresponding to the groove, forming a high bonding force of the three-dimensional bonding surface between the two, and realizing the high strength of the structural composite sheet. Impact resistance; the cutting edge formed on the edge can maintain a sharp cutting edge for a long time, achieving high cutting efficiency.

Description

A kind of cemented carbide substrate and polycrystalline diamond cemented carbide composite sheet

technical field

The utility model relates to the technical field of drilling equipment, in particular to a cemented carbide substrate and a polycrystalline diamond cemented carbide composite sheet.

Background technique

Polycrystalline diamond compact PDC has both the high wear resistance of diamond and the high toughness of cemented carbide, and is widely used in oil and gas drilling, mining, engineering construction and other fields. The widely used planar diamond compacts are usually cylindrical. In the early stage of drilling and mining, the contact and interaction area between the composite sheet and the rock is small, and the drilling speed of the drill bit is relatively fast. As the arc-shaped edge of the diamond layer is worn into a plane, the contact area between the composite sheet and the rock is significantly increased, which is manifested as The drill bit becomes blunt, and the drilling speed and efficiency are reduced. At the same time, the difference in natural physical properties between diamond and cemented carbide also makes it difficult to improve the impact resistance of the composite sheet.

At present, an important way to improve the impact resistance of diamond composite sheets is to increase the contact area of the bonding interface between the diamond layer and the cemented carbide layer to strengthen the bonding force, and to optimize the material properties near the bonding interface to enhance the matching. Research on the improvement of cutting efficiency mainly focuses on the development and optimization of various special-shaped structural composite sheets. For planar structural composite sheets, machining, EDM cutting or laser etching are usually used to process structures with edges and sharp corners. . But the processing efficiency is low and the cost is high.

Therefore, it is necessary to provide a cemented carbide substrate that can be combined with polycrystalline diamond to form a composite sheet to produce high cutting efficiency and high impact resistance, which is an important way to improve the cutting efficiency of diamond drill bits and reduce mining costs.

Utility model content

The utility model provides a cemented carbide substrate and a polycrystalline diamond cemented carbide composite sheet, which overcomes the defects of poor impact resistance and low cutting efficiency in the prior art.

For realizing the above object, the scheme of the present utility model is as follows:

A cemented carbide substrate, the end surface is provided with a groove approximately polygonal, concentric with the end surface, several corners of the polygon respectively extend beyond the edge of the end surface, and divide the end surface into several crescent-shaped protrusions with the same area.

Further, the groove is approximately rhomboid, with two acute angles extending beyond the edge of the end face.

Further, the side surface and the bottom surface of the groove are respectively a combination of one or more of flat surfaces, arc surfaces, curved surfaces, and protrusions.

A polycrystalline diamond cemented carbide composite sheet includes the above-mentioned cemented carbide substrate and polycrystalline diamond, and the polycrystalline diamond is matched with the groove and fixed therein.

Further, the bottom of the polycrystalline diamond and the bottom of the groove are respectively provided with matching chamfers.

Compared with the prior art, the utility model has the following beneficial effects:

The cemented carbide matrix provided by the utility model can be combined with polycrystalline diamond to form a high bonding force of a three-dimensional bonding surface during use, and realize the high impact resistance of the structural composite sheet; cutting edges can be formed between the protrusions to maintain sharp cutting Cutting edge for high cutting efficiency.

Description of drawings

Fig. 1 is a three-dimensional view of the cemented carbide substrate of the present invention.

Fig. 2 is a perspective view of the polycrystalline diamond cemented carbide composite sheet of the utility model.

Among them: 1. Carbide substrate; 2. Polycrystalline diamond; 11. Groove; 12. Protrusion.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

It should also be noted that terms such as "installation", "connection", "connection", "fixation" and "setup" should be understood in a broad sense unless otherwise clearly stipulated and limited, for example, it can be fixed connection or It is a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two parts or the interaction relationship between two parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances.

In the first embodiment, as shown in Figure 1, a kind of cemented carbide substrate 1 is provided, which is a cylinder, and the upper end surface is provided with a groove 11 approximately rhombus-shaped, concentric with the end surface, and the two grooves 11 The acute angles respectively extend beyond the edge of the end face, that is, the length of the longer diagonal of the rhombus is greater than the diameter of the end face. The groove 11 divides the end surface into two crescent-shaped protrusions 12 .

In the second embodiment, as shown in Figure 2, a polycrystalline diamond cemented carbide compact is provided, comprising the cemented carbide substrate 1 described in the first embodiment, and matching with the groove 11 And the polycrystalline diamond 2 fixed therein. The polycrystalline diamond 2 and the cemented carbide substrate 1 form a high bonding force of a three-dimensional bonding surface to realize the high impact resistance of the structural composite sheet. The edge of the end face is located between the protrusions 12 to form a cutting edge, which maintains a sharp cutting edge and achieves high cutting efficiency.

In the above-mentioned embodiment, the side surface and the bottom surface of the groove 11 are respectively a combination of one or more of planes, arc surfaces, curved surfaces, and protrusions. When the polycrystalline diamond 2 and the groove 11 can increase the bonding area and further improve the bonding force. Matching chamfers are respectively provided on the bottom of the polycrystalline diamond 2 and the bottom of the groove 11 to facilitate welding and fixing of the two.

When the composite sheet is cutting, because the wear resistance of the cemented carbide substrate 1 is much lower than that of the polycrystalline diamond 2, the cemented carbide near the cutting part is preferentially worn, and the cutting edge of the polycrystalline diamond material with a diamond-shaped acute angle structure is exposed in time. The structural cutting edge can still maintain sharp characteristics when the composite sheet has a large amount of wear, so as to achieve continuous high cutting efficiency.

In other embodiments, the approximately rhombus-shaped groove 11 can be designed as an approximately regular polygon surrounded by straight lines and/or curves, such as a regular triangle, square, regular pentagon, or regular hexagon. "Approximate" means that from the perspective of top view, the profile of the end face has the basic characteristics of a regular polygon, the size of each corner is equal, and the profile of each side can be at least one arc, multiple straight lines and combinations thereof. The center of the circumscribed circle of the regular polygon coincides with the center of the end face to ensure that the end face is divided into at least two protrusions 12 with the same area to form at least two cutting edges that are uniformly distributed at the center point of the end face. Multiple sets of cutting edges can realize multiple use of the composite sheet in one index, improve cutting efficiency, and effectively reduce the cost of using the composite sheet.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. The hard alloy matrix is characterized in that a groove (11) which is approximately polygonal is arranged on the end face and is concentric with the end face, and a plurality of corners of the polygon respectively extend to the outside of the edge of the end face to divide the end face into a plurality of crescent-shaped protrusions (12) with the same area.

2. Cemented carbide body according to claim 1, characterized in that the grooves (11) are approximately diamond shaped, with two acute angles extending beyond the edge of the end face.

3. The cemented carbide substrate according to claim 1, characterized in that the side and bottom surfaces of the groove (11) are one or more combinations of plane, arc, curved and convex, respectively.

4. A polycrystalline diamond cemented carbide compact comprising a cemented carbide substrate according to any one of claims 1 to 3 and polycrystalline diamond (2), the polycrystalline diamond (2) being fitted into the grooves (11) and fixed therein.

5. A compact according to claim 4, characterised in that the polycrystalline diamond (2) and the groove (11) are provided with matching chamfers at their bottoms, respectively.

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