阅读说明：本技术 一种高寿命的凸脊型聚晶金刚石复合片 (Long-life convex ridge type polycrystalline diamond compact ) 是由 黄莹祥 何泽伟 杨志宏 林文彬 何克华 庄智智 吴跃明 柳时栋 于 2020-07-28 设计创作，主要内容包括：一种高寿命的凸脊型聚晶金刚石复合片,包括硬质合金基体及固定于硬质合金基体上的聚晶金刚石层,聚晶金刚石层的端面包括2个或2个以上的切面,每相邻两个切面之间相交形成一条凸脊,聚晶金刚石层的底部外缘部位设有若干个与凸脊的径向边缘相对应的凸出,凸出沿硬质合金基体方向延伸,硬质合金基体对应设有若干与凸出相适配的凹槽。本发明在聚晶金刚石层的底部外缘部位设有若干个与凸脊的径向边缘相对应的凸出,而硬质合金基体对应设有若干凹槽。采用凸出与凹槽相互配合的方式,不仅可在兼顾成本情况下,有效增加了聚晶金刚石层工作部位的寿命,而且还可提高聚晶金刚石层的抗冲击韧性。(The utility model provides a convex ridge type polycrystalline diamond compact of high life, includes the carbide base member and is fixed in the polycrystalline diamond layer on the carbide base member, and the terminal surface on polycrystalline diamond layer includes 2 or the tangent planes more than 2, and every two adjacent tangent planes are crossing to form a convex ridge, and the bottom outer fringe position on polycrystalline diamond layer is equipped with the corresponding protrusion in radial edge of a plurality of and convex ridge, and the protrusion extends along carbide base member direction, and the carbide base member corresponds the recess that is equipped with a plurality of and protrusion looks adaptation. The bottom outer edge of the polycrystalline diamond layer is provided with a plurality of bulges corresponding to the radial edges of the convex ridges, and the hard alloy matrix is correspondingly provided with a plurality of grooves. The mode that adopts protrusion and recess to mutually support not only can be under taking into account the cost circumstances, effectively increased polycrystalline diamond layer work position's life-span, but also can improve polycrystalline diamond layer's impact toughness.)

1. The utility model provides a convex ridge type polycrystalline diamond compact of long-life, includes the carbide base member and is fixed in polycrystalline diamond layer on the carbide base member, the terminal surface of polycrystalline diamond layer includes 2 or more than 2 tangent planes, intersects between every two adjacent tangent planes and forms a convex ridge, its characterized in that: the bottom outer edge part of the polycrystalline diamond layer is provided with a plurality of bulges corresponding to the radial edges of the convex ridges, the bulges extend along the direction of the hard alloy matrix, and the hard alloy matrix is correspondingly provided with a plurality of grooves matched with the bulges.

2. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the height of the protrusion in the longitudinal direction is greater than 0.1 mm.

3. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the convex shape is arc-shaped or hemispherical-like.

4. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the height of the protrusion in the longitudinal direction is gradually reduced from the radial outer side of the polycrystalline diamond layer to the middle of the polycrystalline diamond layer.

5. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the end face of the polycrystalline diamond layer consists of two tangent planes, and the two tangent planes are intersected to form a convex ridge passing through the center of the end face of the polycrystalline diamond layer.

6. The long-life convex ridge-type polycrystalline diamond compact of claim 5, wherein: the middle part of the convex ridge is concave downwards to form a platform, and the platform is in transition connection with the convex ridges at two ends with a certain radian.

7. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the end face of the polycrystalline diamond layer consists of three tangent planes and a triangular plane, the triangular plane is arranged in the middle of the end face of the polycrystalline diamond layer, every two adjacent tangent planes are in transition connection through a convex ridge, and every tangent plane is in transition connection with the triangular plane through a convex ridge.

8. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the tangent plane is an arc-shaped plane, or an inclined plane with a certain angle, or the arc-shaped plane is combined with the tangent plane.

9. The long-life convex ridge-type polycrystalline diamond compact of claim 8, wherein: when the section is an arc surface, the radius of the arc surface is 1-100 mm; when the tangent plane is an inclined plane, the included angle between the inclined plane and the horizontal end surface is 1-89 degrees.

10. The long-life convex ridge-type polycrystalline diamond compact of claim 1, wherein: the top end of the convex ridge is in a tip angle, a plane or a cambered surface.

Technical Field

The invention relates to the technical field of superhard materials, in particular to a long-life convex ridge type polycrystalline diamond compact.

Background

Polycrystalline Diamond Compact (PDC), hereinafter referred to as PDC), is formed by sintering a polycrystalline diamond layer (PCD-polycrystalline diamond compact, hereinafter referred to as PCD) and a cemented carbide (cemented carbide-carbide) substrate at high temperature and high pressure. It has both the hardness and wear resistance of diamond and the strength and impact toughness of hard alloy, and is one excellent material for cutting tool and wear resisting tool.

At present, PDC cutting elements for drill bits in drilling and production generally adopt a plane PCD layer and special-shaped PCD layers such as a ball head shape, a conical head shape and the like, but with the deepening of drilling depth, higher requirements are put forward on the performances such as efficiency, wear resistance, impact toughness, thermal stability and the like of a drilling tool. The Chinese patent with application publication number CN 109681125A discloses an indent convex ridge shaped diamond compact, which comprises a hard alloy substrate and a diamond composite layer arranged at the upper end of the hard alloy substrate, wherein 2-6 convex ridges extending from a radial edge to the middle part of the end surface are arranged on the end surface of the diamond composite layer, the convex ridges are upwards protruded, the whole or part of each convex ridge is downwards inclined from the radial edge and extends to intersect in the middle part of the end surface to form an indent convex ridge, and a positive rake angle cutting edge is formed at the intersection of the convex ridges and the radial edge.

The invention can improve the crushing drilling performance of the composite sheet, reduce the drilling and cutting resistance and further improve the mechanical drilling speed of the diamond bit. However, since the diamond composite layer of the present invention is provided with the ridges, the portions of the diamond composite layer which are easily worn during cutting work of the diamond composite sheet are located on the diamond composite layer corresponding to the ridges and are worn obliquely from the radial edge to the inner side, and since the bonding surface of the diamond composite layer corresponding to the ridges of the present invention and the cemented carbide substrate is a plane, once the radial edge of the diamond composite layer is completely worn, the diamond composite sheet must be replaced, and therefore, the service life of the diamond composite sheet of the present invention is not long. I have provided a long-life ridge-type polycrystalline diamond compact.

Disclosure of Invention

The invention provides a long-life convex ridge type polycrystalline diamond compact, which aims to overcome the defects of short service life and the like of the conventional convex ridge type polycrystalline diamond compact.

The invention adopts the following technical scheme:

the utility model provides a high life's protruding ridge type polycrystalline diamond compact, includes the carbide base member and is fixed in polycrystalline diamond layer on the carbide base member, the terminal surface on polycrystalline diamond layer includes 2 or the tangent planes more than 2, and the crossing ridge that forms between every two adjacent tangent planes, the bottom outer fringe position on polycrystalline diamond layer be equipped with a plurality of with the corresponding protrusion in the radial edge of convex ridge, the protrusion is followed the carbide base member direction extends, the carbide base member correspond be equipped with a plurality of with the recess of protrusion looks adaptation.

Further, the height of the protrusion in the longitudinal direction is greater than 0.1 mm.

Preferably, the shape of the protrusion is an arc or a hemisphere-like shape.

Further, the height of the projection in the longitudinal direction is gradually reduced from the radially outer side to the middle of the polycrystalline diamond layer.

In a preferred embodiment, the end surface of the polycrystalline diamond layer comprises two cut surfaces which intersect to form a ridge passing through the centre of the end surface of the polycrystalline diamond layer.

Furthermore, the middle part of the convex ridge is concave downwards to form a platform, and the platform is in transition connection with the convex ridges at two ends with a certain radian.

In another preferred embodiment, the end surface of the polycrystalline diamond layer is composed of three cut surfaces and a triangular plane, the triangular plane is arranged in the middle of the end surface of the polycrystalline diamond layer, every two adjacent cut surfaces are in transition connection through a ridge, and each cut surface is in transition connection with the triangular plane through a ridge.

Furthermore, the tangent plane is an arc-shaped plane, or an inclined plane with a certain angle, or the arc-shaped plane is combined with the tangent plane.

Furthermore, when the section is an arc-shaped surface, the radius of the arc-shaped surface is 1-100 mm; when the tangent plane is an inclined plane, the included angle between the inclined plane and the horizontal end surface is 1-89 degrees.

Further, the top end of the raised ridge is in a tip angle, a plane or a cambered surface.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

1. the bottom outer edge of the polycrystalline diamond layer is provided with a plurality of bulges corresponding to the radial edges of the convex ridges, and the hard alloy matrix is correspondingly provided with a plurality of grooves. The mode that adopts protrusion and recess to mutually support not only can be under taking into account the cost circumstances, effectively increased polycrystalline diamond layer work position's life-span, but also can improve polycrystalline diamond layer's impact toughness.

2. The convex ridge type polycrystalline diamond compact can obviously improve the rock breaking efficiency, improve the chip removal capacity and reduce the drilling resistance in the working process, thereby improving the mechanical drilling speed of the drill bit.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is an exploded view of a first embodiment of the present invention.

Fig. 3 is a top view of the first embodiment of the invention.

Fig. 4 is a sectional view taken along a-a in fig. 3.

Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 6 is an exploded view of the second embodiment of the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details. Well-known components, methods and processes are not described in detail below.

Implement one

The long-life convex ridge type polycrystalline diamond compact comprises a hard alloy substrate 10 and a polycrystalline diamond layer 20 fixed on the hard alloy substrate 10, wherein the diameter of the PDC is 15.88mm, the total height of the PDC is 13.20mm, and a synthesis and laser processing technology is adopted in the manufacturing technology of the polycrystalline diamond layer 20. The end face of the polycrystalline diamond layer 20 of this embodiment has a roof-shaped curved surface structure formed by two symmetrical cut surfaces 21 at an included angle, the two cut surfaces 21 intersect at the top end to form a ridge 22, and the ridge 22 extends from the radial edge of one side of the end face of the polycrystalline diamond layer to the radial edge of the other side of the end face of the polycrystalline diamond layer and passes through the center of the end face.

Referring to fig. 1 and 2, the two tangent planes 21 shown in the present embodiment are arc planes, but may be inclined planes with a certain angle, or a combination of the arc planes and the tangent planes. The radius of the arc-shaped surface and the radius R of the arc length are both 12 mm. A chamfer of 0.41mm is formed between the radial edges of the two cut surfaces 21 and the sides of the polycrystalline diamond layer. The transition surface between the two arc-shaped surfaces adopts a fillet transition of 0.50mm, that is, the top end of the ridge 22 in this embodiment is a fillet of 0.50mm, however, the shape of the top end of the ridge 22 in the present invention is not limited to this, and may also be a tip angle, a plane, or other convex arc surface.

Referring to fig. 1 to 3, the middle of the ridge 22 is recessed downward to form a platform 23, and the depth of the recess of the platform 23 is 0.30mm, so that the chip removal capability of the PDC can be improved. The platform 23 is transitionally connected with the ridges 22 at two ends by a certain radian, and the ridges 22 at two ends of the platform 23 are 2 available cutting working positions. The thickness of the working part of the convex ridge reaches 4.50 mm.

Referring to fig. 2 and 4, the bottom outer edge of the polycrystalline diamond layer 20 is provided with two protrusions 24 corresponding to the radial edges of the ridges at both ends, the protrusions 24 extend along the direction of the cemented carbide substrate 10, the height of the protrusions 24 is about 1.50mm, and the protrusions 24 in this embodiment are shaped like a hemisphere, but may also be arc. The height of the projection 24 in the longitudinal direction gradually decreases from the radially outer side of the polycrystalline diamond layer to the middle thereof. The cemented carbide substrate 10 is correspondingly provided with two grooves 11 matched with the protrusions.

Fig. 4 is a cross-sectional view along a ridge line of the invention, AB is the thickness of the polycrystalline layer, BC is the thickness of the polycrystalline layer protruding downwards, angle ACD is the working angle of the product, AE is the notch projection when worn to the position B, and AD is the notch projection when worn to the position C.

By combining the designs of AB, BC and & lt ACD, AD = (AB + BC) & lt tan ACD can be obtained, and a CD connecting line is a ground surface projection when the CD connecting line is worn to a position C;

the hard alloy substrate takes a point from C or C to the bottom as a starting point, simultaneously takes a point from D or D to the right as an end point, and takes a connecting line of two points as a design of one or more segments of external arc lines as a groove in an alloy interface;

the CD length does not exceed one third of the cemented carbide body thickness for impact toughness.

By the design of the groove, the service life of the hard alloy substrate can be prevented from being influenced by abrasion in work.

The convex ridge type polycrystalline diamond compact and the plane type polycrystalline diamond compact with the same size are subjected to laboratory tests. Test results show that the cutting resistance of the convex ridge type polycrystalline diamond compact is far smaller than that of a comparison sample, the grinding quantity of a working part is more, and the service life of a product is longer. Compared with a single-position test, the abrasion resistance of the ridge type product is improved by about 50%, the impact resistance is improved by about 300%, and the service life is improved by about 200%.