Impact-resistant multi-cutting-edge diamond compact and earth-boring tool

1 . An impact-resistant multi-cutting-edge diamond compact, comprising a cylindrical cemented carbide substrate ( 102 ) and a diamond composite layer ( 101 ), the diamond composite layer being disposed at a top end of the cemented carbide substrate, wherein at least two sections of different chamfers ( 103 , 104 ) are provided on a circumferential edge of a top end of the diamond composite layer ( 101 ), so as to form different cutting edges, the different cutting edges comprise at least one section of main cutting edge ( 103 ) and a section of impact-resistant cutting edge ( 104 ; 106 ) is provided on each of two sides of the main cutting edge ( 103 ), a cutting performance of the main cutting edge ( 103 ) is better than that of the impact-resistant cutting edge ( 104 ; 106 );

a recessed flow guide cavity ( 107 ) is provided on a top end face of the diamond composite layer ( 101 ) to guide a water flow to the main cutting edge ( 103 ) when a stratum is drilled so as to cool the main cutting edge ( 103 ), wherein the recessed flow guide cavity ( 107 ) comprises a flow guide groove that tapers from inside to outside along a radial direction of the diamond composite layer, and an outer end of the flow guide groove is adjacent to the main cutting edge ( 103 ) or intersects with the main cutting edge ( 103 ).

2 . The impact-resistant multi-cutting-edge diamond compact according to claim 1 , wherein the entire circumferential edge of the top end of the diamond composite layer ( 101 ) is provided with 2 to 4 sections of different chamfers, thereby forming 2 to 4 sections of different cutting edges.

3 . The impact-resistant multi-cutting-edge diamond compact according to claim 2 , wherein the chamfer comprises at least the following types: a single-beveled-surface chamfer, a double-beveled-surface chamfer, or a curved-surface chamfer.

4 . The impact-resistant multi-cutting-edge diamond compact according to claim 2 , wherein two different sections of chamfers meet one of the following conditions:

types are different; and

the types are the same, but structural parameters are different.

5 . The impact-resistant multi-cutting-edge diamond compact according to claim 2 , wherein an included angle between a beveled surface of the chamfer and a radial plane of the diamond composite layer ( 101 ) ranges from 20° to 70°, and the top end of the diamond composite layer ( 101 ) is perpendicular to an axis of the cylindrical cemented carbide substrate ( 102 ).

6 . The impact-resistant multi-cutting-edge diamond compact according to claim 2 , wherein an axial height of the chamfer ranges from 0.2 to 3 mm, or a radial width of the chamfer ranges from 0.2 to 5 mm.

7 . The impact-resistant multi-cutting-edge diamond compact according to claim 3 , wherein the main cutting edge is a single-beveled-surface chamfer with a radial width of less than 0.4 mm and an included angle of 45°, or a single-beveled-surface chamfer with a radial width of greater than 0.4 mm and an included angle of less than 30°, or a double-beveled-surface chamfer with a radial width of greater than 0.4 mm and an inclination angle of less than 30° of an inner beveled-surface, and a central angle corresponding to each main cutting edge ranges from 50° to 70°.

8 . The impact-resistant multi-cutting-edge diamond compact according to claim 3 , wherein the double-beveled-surface chamfer comprises an inner beveled-surface and an outer beveled-surface, and an included angle between the outer beveled-surface and a radial plane of the diamond composite layer ( 101 ) is greater than an included angle between the inner beveled-surface and the radial plane of the diamond composite layer ( 101 ).

9 . The impact-resistant multi-cutting-edge diamond compact according to claim 3 , wherein the impact-resistant cutting edge is a single-beveled-surface chamfer with a radial width ranging from 0.5 to 2 mm and an included angle of greater than or equal to 45° or a circular arc chamfer with a radius of curvature ranging from 0.5 to 2 mm.

10 . An earth-boring tool, comprising the impact-resistant multi-cutting-edge diamond compact according to claim 1 .

11 . The impact-resistant multi-cutting-edge diamond compact according to claim 1 , comprising two recessed flow guide cavities ( 107 ) provided at intervals.

12 . The impact-resistant multi-cutting-edge diamond compact according to claim 1 , comprising multiple sections of main cutting edges ( 503 , 505 , 507 ) and multiple sections of impact-resistant cutting edges ( 504 , 506 , 508 ), wherein the main cutting edges and the impact-resistant cutting edges are alternately provided, and a plurality of flow guide grooves ( 509 ) are respectively and correspondingly provided between the multiple sections of main cutting edges ( 503 , 505 , 507 ) and a center of the top end face of the diamond composite layer ( 101 ), inner ends of the plurality of flow guide grooves ( 509 ) converging at the center of the top end face of the diamond composite layer ( 101 ).

13 . The impact-resistant multi-cutting-edge diamond compact according to claim 1 , comprising two main cutting edges ( 603 , 605 ) provided at intervals, wherein the two recessed flow guide cavities ( 107 ) provided at intervals extend between the two main cutting edges ( 603 , 605 ) provided at intervals.