Groove-shaped diamond compact, anchor rod drill bit, coreless drill bit and coring drill bit

Abstract

The utility model relates to a groove-shaped diamond compact, an anchor rod drill bit, a coreless drill bit and a coring drill bit. The groove-shaped diamond compact comprises a hard alloy matrix and a diamond layer, wherein the bottom surface of the diamond layer is fixed with the top surface of the hard alloy matrix; the hard alloy matrix is cylindrical, the diamond layer is in a circular truncated cone shape with the same diameter as the hard alloy matrix, and the diamond layer and the hard alloy matrix are coaxial. A chip groove is formed in the middle of the top face of the diamond layer and extends and penetrates in the radial direction of the diamond layer. The utility model further discloses the anchor rod drill bit using the groove-shaped diamond compact. The groove-shaped diamond compact is installed on the top of the anchor rod drill bit, and the included angle alpha between the axis of the chip groove and the axis of the drill handle portion is larger than or equal to 30 degrees and smaller than or equal to 50 degrees. According to the groove-shaped diamond compact and the drill bit, the chip groove is formed in the top, rock chips can be discharged in time, extrusion to the cutting edge after a rock pillar is broken is reduced, and therefore the condition of tooth breakage can be avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of drilling equipment, and in particular to a grooved diamond composite sheet. Background Technology

[0002] When anchor drill bits drill into rock formations, the water outlet at the center of the drill bit causes small rock columns to remain after cutting the rock. Radial vibration occurs during the drilling process, which breaks up these small rock columns. The planar composite cutting edge used in existing anchor drill bits has a long cutting edge, and the debris generated after the rock columns break is not easily discharged, which causes a large impact on the cutting edge of the composite cutting edge, resulting in tooth breakage.

[0003] Furthermore, anchor bolt drill bits typically made using planar composite plates have relatively low cutting speeds due to the long cutting edges of the composite plates, resulting in lower pressure applied to the rock formation. Therefore, there is a need for an anchor bolt drill bit that can improve cutting speed and facilitate rock column chip removal. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a grooved diamond composite sheet and its drill bit.

[0005] The technical solution of this utility model is: a grooved diamond composite sheet, comprising a cemented carbide substrate and a diamond layer, wherein the bottom surface of the diamond layer is fixed to the top surface of the cemented carbide substrate; the cemented carbide substrate is cylindrical, and the diamond layer is frustum-shaped with the same diameter as the cemented carbide substrate, and the diamond layer and the cemented carbide substrate are coaxial.

[0006] A chip removal groove is formed in the center of the top surface of the diamond layer, extending radially through the diamond layer. This groove allows the stone pillar formed by cutting the rock layer to be ejected along the chip removal groove after it breaks, reducing the pressure on the cutting edge after the rock pillar breaks, thereby preventing tooth breakage.

[0007] A grooved diamond composite sheet includes a cemented carbide substrate and a diamond layer, wherein the bottom surface of the diamond layer is fixed to the top surface of the cemented carbide substrate; the cemented carbide substrate is semi-cylindrical, and the diamond layer is a semi-frustum with the same diameter as the cemented carbide substrate, and the diamond layer and the cemented carbide substrate are coaxial and their sides overlap.

[0008] A chip removal groove is provided on the top surface of the diamond layer, and the chip removal groove extends through the straight edge of the diamond layer.

[0009] Preferably, the bottom of the chip removal groove is arc-shaped, with a groove depth of h and a diamond layer thickness of H, where 1 / 3H ≤ h ≤ 2 / 3H; the groove width is a; and the diamond layer diameter is A, where 1 / 3A ≤ a ≤ 1 / 2A. The arc-shaped groove reduces friction between rock chips and the chip removal groove, ensuring that rock chips can be smoothly removed.

[0010] An anchor bolt drill bit using a grooved diamond composite sheet includes a drill shank, a connecting part, and a drill bit mounting seat. The drill bit mounting seat is circular, and a grooved diamond composite sheet is installed inside it. The angle between the axis of its chip removal groove and the axis of the drill shank is α, 30°≤α≤50°. The angle between the axis of the chip removal groove and the axis of the drill shank allows the chip removal groove to directly point to the location of rock column breakage at the cutting front end, enhancing the chip removal efficiency of the anchor bolt drill bit. Several wing-shaped bodies are connected to the upper part of the drill shank, and the wing-shaped bodies are spirally arranged around the axis of the drill shank. The drill bit mounting seat is located on the top of the wing-shaped bodies. A chip removal channel is provided at the lower part of the wing-shaped bodies where they connect to the drill shank. The connecting part is located at the bottom of the drill shank, and the connecting part has internal threads. The drill shank is provided with a water outlet channel that runs through the axis of the drill shank.

[0011] An anchor drill bit using the aforementioned grooved diamond composite sheet includes a drill shank, a connecting part, and a drill bit mounting seat. The shape of the drill bit mounting seat matches the shape of the grooved diamond composite sheet. The grooved diamond composite sheet is installed inside the drill bit mounting seat. The angle between the axis of its chip removal groove and the axis of the drill shank is α, 30°≤α≤50°. A plurality of wing-shaped bodies are connected to the upper part of the drill shank, and the wing-shaped bodies are spirally arranged around the axis of the drill shank. The drill bit mounting seat is located on the top of the wing-shaped bodies. The bottom of the chip removal groove is flush with the surface of the wing-shaped bodies. A chip removal channel is provided at the connection between the lower part of the wing-shaped bodies and the drill shank. The connecting part is located at the bottom of the drill shank, and the connecting part has an internal thread. The drill shank is provided with a water outlet channel that runs through the axis of the drill shank.

[0012] Preferably, at least one drill bit mounting base contains a grooved diamond composite sheet. The alternating arrangement of the two types of diamond composite sheets allows the anchor drill bit to adapt to a wider variety of rock formations with varying hardness, increasing the drill bit's versatility.

[0013] A coreless drill bit using grooved diamond composite plates includes an integral shank and several wings. The shank has a hollow interior and an installation thread at its tail. The wings surround the front end of the shank, and each wing has a main feed composite plate and a reaming composite plate. The reaming composite plate is located on the outer edge of the wing, and the main feed composite plate is located on the inner side of the reaming composite plate. A flushing hole communicating with the interior of the shank is provided on the front face of the shank. There are at least two reaming composite plates, arranged on the same circumference. The shank has flushing holes between the flushing holes. The front end face is provided with a raised auxiliary wing, and the auxiliary wing is provided with an auxiliary composite plate; the upper side of the shank is provided with an auxiliary flushing hole in the part between the wings; the main feed composite plate is a grooved diamond composite plate or a planar diamond composite plate, the hole enlarging composite plate is a grooved diamond composite plate or a planar diamond composite plate, and the auxiliary composite plate is a grooved diamond composite plate or a planar diamond composite plate; the angle between the axis of the chip removal groove of the grooved diamond composite plate and the axis of the shank is β, 30°≤β≤50°.

[0014] Preferably, the main feed composite sheets are all grooved diamond composite sheets, the reaming composite sheets are all grooved diamond composite sheets, and the auxiliary composite sheets are all grooved diamond composite sheets; or, a portion of the main feed composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately; a portion of the reaming composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately; a portion of the auxiliary composite sheets on the auxiliary wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately.

[0015] A core drill bit using a grooved diamond composite sheet includes an integral shank and several wings. The shank has a core hole in its center and a mounting thread at its tail. The wings surround the front end of the shank, and each wing has a main feed composite sheet and a reaming composite sheet. The reaming composite sheet is located on the outer edge of the wing, and the main feed composite sheet is located inside the reaming composite sheet. There are at least two reaming composite sheets, arranged front and rear on the same circumference. The main feed composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet, and the reaming composite sheet is also a grooved diamond composite sheet or a planar diamond composite sheet. The angle between the axis of the chip removal groove of the grooved diamond composite sheet and the axis of the shank is greater than or equal to 30° and less than or equal to 50°.

[0016] Preferably, all main feed composite sheets are grooved diamond composite sheets, and all reaming composite sheets are grooved diamond composite sheets; or, a portion of the main feed composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately; a portion of the reaming composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately.

[0017] The beneficial effects of this utility model are as follows: The grooved diamond composite sheet of this utility model has the following advantages:

[0018] 1. A chip removal groove is opened at the top of the diamond composite sheet to remove rock fragments in time, reduce the pressure on the cutting edge after the rock column breaks, and thus avoid tooth breakage.

[0019] 2. By creating the chip removal groove, the length of the cutting edge is reduced, which increases the pressure on the rock layer and improves the cutting speed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the grooved diamond composite sheet according to Embodiment 1 of this utility model;

[0021] Figure 2 yes Figure 1 The main view;

[0022] Figure 3 This is a schematic diagram of the structure of the grooved diamond composite sheet in Embodiment 2 of this utility model;

[0023] Figure 4 This is a cross-sectional view of the drilling process of the anchor drill bit (the anchor drill bit is not cut out).

[0024] Figure 5 This is a schematic diagram of the anchor drill bit structure in Example 3;

[0025] Figure 6 yes Figure 5 The main view;

[0026] Figure 7 yes Figure 5 A bird's-eye view Figure 1 (Double-groove diamond composite sheet);

[0027] Figure 8 yes Figure 5 A bird's-eye view Figure 2 (Single-groove diamond composite sheet);

[0028] Figure 9 This is a schematic diagram of the anchor drill bit structure in Example 4;

[0029] Figure 10 yes Figure 9 The main view;

[0030] Figure 11 yes Figure 9 A bird's-eye view Figure 1 (Double-groove diamond composite sheet);

[0031] Figure 12 yes Figure 9 A bird's-eye view Figure 2 (Single-groove diamond composite sheet);

[0032] Figure 13 This is a schematic diagram of the structure of the coreless drill bit in Example 5 (only the main feed composite plate is a grooved diamond composite plate).

[0033] Figure 14 yes Figure 13 The main view;

[0034] Figure 15 This is a schematic diagram of the core drill bit in Example 6 (only the main feed composite plate is a grooved diamond composite plate).

[0035] In the diagram: 00. Rock strata, 01. Rock column, 02. Planar diamond composite sheet, 1. Groove diamond composite sheet, 11. Diamond layer, 12. Carbide matrix, 13. Chip removal groove, 14. Cutting edge.

[0036] 2. Anchor drill bit; 21. Drill shank; 22. Wing-shaped body; 221. Drill bit mounting base; 23. Connecting part; 24. Chip removal channel; 25. Water outlet channel.

[0037] 3. Coreless drill bit; 31. Shank; 32. Wing; 321. Main feed compound; 322. Reamer compound; 33. Auxiliary wing; 331. Auxiliary compound; 34. Flushing hole; 35. Auxiliary flushing hole.

[0038] 4. Core drill bit, 41. Shank, 42. Wing, 421. Main feed compound, 422. Reaming compound, 43. Core hole, 44. Mounting thread. Detailed Implementation

[0039] Example 1: See Figure 1-2 A grooved diamond composite sheet 1 includes a cemented carbide substrate 12 and a diamond layer 11, wherein the bottom surface of the diamond layer 11 is fixed to the top surface of the cemented carbide substrate 12; the cemented carbide substrate 12 is cylindrical, and the diamond layer 11 is frustum-shaped with the same diameter as the cemented carbide substrate 12, and the diamond layer 11 and the cemented carbide substrate 12 are coaxial.

[0040] A chip removal groove 13 is provided in the center of the top surface of the diamond layer 11, and the chip removal groove 13 extends radially through the diamond layer 11. It can eject the stone column formed by cutting the rock layer 00 along the chip removal groove 13 after it is broken, reducing the pressure on the cutting edge after the rock column 01 is broken, thereby avoiding tooth breakage.

[0041] The bottom of the chip removal groove 13 is arc-shaped, with a depth of h and a diamond layer 11 thickness of H, where 1 / 3H ≤ h ≤ 2 / 3H; the width of the chip removal groove 13 is a; and the diameter of the diamond layer 11 is A, where 1 / 3A ≤ a ≤ 1 / 2A. The arc-shaped groove reduces friction between rock cuttings and the chip removal groove 13, ensuring that the rock cuttings can be smoothly discharged.

[0042] The grooved diamond composite sheet 1 of this utility model has a chip removal groove 13 on the top, which reduces the length of the cutting edge 14, increases the pressure on the rock layer 00, makes it easier to cut the rock, and improves the cutting speed of the drill bit.

[0043] Example 2: See Figure 3 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that it includes a cemented carbide substrate 12 and a diamond layer 11. The bottom surface of the diamond layer 11 is fixed to the top surface of the cemented carbide substrate 12. The cemented carbide substrate 12 is semi-cylindrical, and the diamond layer 11 is a semi-frustum with the same diameter as the cemented carbide substrate 12. The diamond layer 11 and the cemented carbide substrate 12 are coaxial and their sides overlap.

[0044] The top surface of the diamond layer 11 is provided with a chip removal groove 13, which extends through the straight edge of the diamond layer 11.

[0045] Example 3: See Figure 6-9An anchor drill bit 2 utilizing the grooved diamond composite sheet 1 described in Embodiment 1 includes a drill shank 21, a connecting portion 23, and a drill bit mounting base 221. The drill bit mounting base 221 is circular, and the grooved diamond composite sheet 1 is installed inside it. The grooved diamond composite sheet 1 is inclined, with the chip removal groove 13 on one side closer to the axis of the anchor drill bit 2 being higher than the other side. The angle between the axis of the chip removal groove 13 and the axis of the drill shank 21 is α, 30°≤α≤50°. The angle between the axis of the chip removal groove 13 and the axis of the drill shank 21 allows the chip removal groove 13 to directly point to the position where the rock column 01 at the cutting front end breaks, thereby enhancing the chip removal efficiency of the anchor drill bit 2. A plurality of wing-shaped bodies 22 are connected to the upper part of the drill shank 21, and the plurality of wing-shaped bodies 22 are spirally arranged around the axis of the drill shank 21; the drill bit mounting seat 221 is located on the top of the wing-shaped bodies 22; a chip removal channel 24 is provided at the lower part of the wing-shaped bodies 22 where they connect with the drill shank 21; the connecting part 23 is located at the bottom of the drill shank 21, and the connecting part 23 is provided with internal threads; the drill shank 21 is provided with a water outlet channel 25, which runs through the axis of the drill shank 21.

[0046] At least one drill bit mounting base 221 contains a grooved diamond composite plate 1. The two types of diamond composite plates are arranged alternately, which enables the anchor drill bit 2 to adapt to more types and different rock formations 00, increasing the versatility of the drill bit.

[0047] A chip removal groove 13 is opened at the top of the diamond composite sheet, which can discharge rock fragments in time, reduce the pressure on the cutting edge after the rock column 01 breaks, and thus avoid the chipping of the teeth.

[0048] Example 4: See Figure 10-13 An anchor drill bit 2 utilizing the grooved diamond composite sheet 1 described in Embodiment 2 includes a drill shank 21, a connecting portion 23, and a drill bit mounting base 221. The shape of the drill bit mounting base 221 matches the shape of the grooved diamond composite sheet 1. The grooved diamond composite sheet 1 is installed inside the drill bit mounting base 221. The grooved diamond composite sheet 1 is inclined, with the chip removal groove 13 having a higher side near the axis of the anchor drill bit 2 than the other side. The angle between the axis of the chip removal groove 13 and the axis of the drill shank 21 is α, where 30°≤α≤50°. A plurality of wing-shaped bodies 22 are connected to the upper part of the drill shank 21, and the plurality of wing-shaped bodies 22 are spirally arranged around the axis of the drill shank 21; the drill bit mounting seat 221 is located on the top of the wing-shaped bodies 22; the bottom of the chip removal groove 13 is flush with the surface of the wing-shaped bodies 22; a chip removal channel 24 is provided at the lower part of the wing-shaped bodies 22 where they connect with the drill shank 21; the connecting part 23 is located at the bottom of the drill shank 21, and the connecting part 23 is provided with internal threads; the drill shank 21 is provided with a water outlet channel 25, which runs through the axis of the drill shank 21.

[0049] At least one drill bit mounting base 221 contains a grooved diamond composite plate 1. The two types of diamond composite plates are arranged alternately, which enables the anchor drill bit 2 to adapt to more types and different rock formations 00, increasing the versatility of the drill bit.

[0050] Example 5: See Figure 13-14 A coreless drill bit 3 utilizing the grooved diamond composite sheet 1 described in both Embodiment 1 and Embodiment 2 includes an integral shank 31 and several wings 32. The shank 31 has a hollow interior and an installation thread at its tail. The wings 32 surround the front end of the shank 31. Each wing 32 has a main feed composite sheet 321 and a reaming composite sheet 322. The reaming composite sheet 322 is located on the outer edge of the wing 32, and the main feed composite sheet 321 is located inside the reaming composite sheet 322. The front end face of the shank 31 has a flushing hole 34 communicating with the interior of the shank 31. There are at least two reaming composite sheets 322, arranged on the same circumference. The front end face of the shank 31 between the flushing holes 34 has... A raised auxiliary wing 33 is provided with an auxiliary composite plate 331; the upper side of the shank 31 located between wings 32 has an auxiliary flushing hole 35; the main feed composite plate 321 is a grooved diamond composite plate 1 or a planar diamond composite plate 02, the hole enlarging composite plate 322 is a grooved diamond composite plate 1 or a planar diamond composite plate 02, and the auxiliary composite plate 331 is a grooved diamond composite plate 1 or a planar diamond composite plate 02; the grooved diamond composite plate 1 is inclined, and the chip removal groove 13 is higher on the side closer to the anchor drill bit axis than on the other side; the angle between the axis of the chip removal groove 13 of the grooved diamond composite plate 1 and the axis of the shank 31 is β, 30°≤β≤50°.

[0051] All main feed composite sheets 321 are grooved diamond composite sheets 1, all reaming composite sheets 322 are grooved diamond composite sheets 1, and all auxiliary composite sheets 331 are grooved diamond composite sheets 1; or, a portion of the main feed composite sheets 321 on several wings 32 are grooved diamond composite sheets 1, and another portion are planar diamond composite sheets 02, with grooved diamond composite sheets 1 and planar diamond composite sheets 02 distributed alternately; a portion of the reaming composite sheets 322 on several wings 32 are grooved diamond composite sheets 1, and another portion are planar diamond composite sheets 02, with grooved diamond composite sheets 1 and planar diamond composite sheets 02 distributed alternately; a portion of the auxiliary composite sheets 331 on the auxiliary wing 33 are grooved diamond composite sheets 1, and another portion are planar diamond composite sheets 02, with grooved diamond composite sheets 1 and planar diamond composite sheets 02 distributed alternately.

[0052] Example 6: See Figure 15A core drill bit 4 utilizing the grooved diamond composite sheet 1 described in Embodiment 2 includes an integral shank 41 and several wings 42. The shank 41 has a core hole 43 in the middle and an installation thread 44 at the tail. Several wings 42 surround the front end of the shank 41. The wings 42 are provided with a main feed composite sheet 421 and a reaming composite sheet 422. The reaming composite sheet 422 is located on the outer edge of the wing 42, and the main feed composite sheet 421 is located on the inner side of the reaming composite sheet 422. There are at least two reaming composite sheets 422, arranged on the same circumference. The main feed composite sheet 421 is a grooved diamond composite sheet 1 or a planar diamond composite sheet 02, and the reaming composite sheet 422 is a grooved diamond composite sheet 1 or a planar diamond composite sheet 02. The angle between the axis of the chip removal groove 13 of the grooved diamond composite sheet 1 and the axis of the shank 41 is greater than or equal to 30° and less than or equal to 50°.

[0053] All main feed composite sheets 421 are grooved diamond composite sheets 1, and all reaming composite sheets 422 are grooved diamond composite sheets 1; or, a portion of the main feed composite sheets 421 on several wings 42 are grooved diamond composite sheets 1, and another portion are planar diamond composite sheets 02, with grooved diamond composite sheets 1 and planar diamond composite sheets 02 distributed alternately; a portion of the reaming composite sheets 422 on several wings 42 are grooved diamond composite sheets 1, and another portion are planar diamond composite sheets 02, with grooved diamond composite sheets 1 and planar diamond composite sheets 02 distributed alternately.

Claims

1. A grooved diamond composite sheet, comprising a cemented carbide substrate and a diamond layer, characterized in that, The bottom surface of the diamond layer is fixed to the top surface of the cemented carbide substrate; the cemented carbide substrate is cylindrical, and the diamond layer is a frustum-shaped structure with the same diameter as the cemented carbide substrate, with the diamond layer and the cemented carbide substrate being coaxial. A chip removal groove is provided in the middle of the top surface of the diamond layer, and the chip removal groove extends through the diamond layer radially. The bottom of the chip removal groove is arc-shaped, the depth of the chip removal groove is h, the thickness of the diamond layer is H, 1 / 3H≤h≤2 / 3H; the width of the chip removal groove is a; the diameter of the diamond layer is A, 1 / 3A≤a≤1 / 2A.

2. A grooved diamond composite sheet, comprising a cemented carbide matrix and a diamond layer, characterized in that, The bottom surface of the diamond layer is fixed to the top surface of the cemented carbide substrate; the cemented carbide substrate is semi-cylindrical, and the diamond layer is a semi-frustum with the same diameter as the cemented carbide substrate. The diamond layer and the cemented carbide substrate are coaxial and their sides overlap. The top surface of the diamond layer is provided with a chip removal groove, which extends through the straight edge of the diamond layer; The bottom of the chip removal groove is arc-shaped, the depth of the chip removal groove is h, the thickness of the diamond layer is H, 1 / 3H≤h≤2 / 3H; the width of the chip removal groove is a; the diameter of the diamond layer is A, 1 / 3A≤a≤1 / 2A.

3. An anchor drill bit, comprising a drill shank, a connecting portion, and a drill bit mounting base; characterized in that: It also includes the grooved diamond composite sheet as described in claim 1. The grooved diamond composite sheet is inclined, with the chip removal groove on one side closer to the axis of the anchor drill bit being higher than the other side; the drill bit mounting base is circular, and the grooved diamond composite sheet is installed inside it; the angle between the axis of its chip removal groove and the axis of the drill shank is α, 30°≤α≤50°; several wing-shaped bodies are connected to the upper part of the drill shank, and the wing-shaped bodies are spirally arranged around the axis of the drill shank; the drill bit mounting base is located on the top of the wing-shaped bodies; a chip removal channel is provided at the lower part of the wing-shaped bodies where they connect to the drill shank; the connecting part is located at the bottom of the drill shank, and the connecting part has internal threads; the drill shank is provided with a water outlet channel, which runs through the axis of the drill shank.

4. An anchor drill bit, comprising a drill shank, a connecting portion, and a drill bit mounting base; characterized in that: It also includes the grooved diamond composite sheet as described in claim 2; The shape of the drill bit mounting base matches the shape of the grooved diamond composite sheet; the grooved diamond composite sheet is inclined, with the chip removal groove on one side closer to the axis of the anchor drill bit being higher than the other side; the grooved diamond composite sheet is installed inside the drill bit mounting base; the angle between the axis of its chip removal groove and the axis of the drill shank is α, 30°≤α≤50°; several wing-shaped bodies are connected above the drill shank, and the wing-shaped bodies are spirally arranged around the axis of the drill shank; the drill bit mounting base is located on the top of the wing-shaped bodies; the bottom of the chip removal groove is flush with the surface of the wing-shaped bodies; a chip removal channel is provided at the connection between the lower part of the wing-shaped bodies and the drill shank; the connecting part is located at the bottom of the drill shank, and the connecting part has internal threads; the drill shank is provided with a water outlet channel, which runs through the axis of the drill shank.

5. The anchor drill bit according to any one of claims 3-4, characterized in that: At least one drill bit mount contains a grooved diamond composite sheet.

6. A coreless drill bit, comprising an integral shank and several wings, the shank having a hollow interior, a threaded mounting end, several wings surrounding the front end of the shank, each wing having a main feed compound and a reaming compound, the reaming compound being located on the outer edge of the wing, the main feed compound being located on the inner side of the reaming compound, a flushing hole communicating with the interior of the shank being provided on the front end face of the shank, at least two reaming compounds being arranged on the same circumference front and rear; a raised auxiliary wing being provided on the front end face of the shank between the flushing holes, the auxiliary wing having an auxiliary compound; an auxiliary flushing hole being provided on the upper side of the shank between the wings; characterized in that: It also includes two types of grooved diamond composite sheets; A grooved diamond composite sheet includes a cemented carbide substrate and a diamond layer, with the bottom surface of the diamond layer fixed to the top surface of the cemented carbide substrate; the cemented carbide substrate is cylindrical, and the diamond layer is a frustum-shaped cone with the same diameter as the cemented carbide substrate, with the diamond layer and the cemented carbide substrate being coaxial. A chip removal groove is provided in the middle of the top surface of the diamond layer, and the chip removal groove extends through the diamond layer radially. Another type of grooved diamond composite sheet includes a cemented carbide matrix and a diamond layer, with the bottom surface of the diamond layer fixed to the top surface of the cemented carbide matrix; the cemented carbide matrix is ​​semi-cylindrical, and the diamond layer is a semi-frustum with the same diameter as the cemented carbide matrix, with the diamond layer and the cemented carbide matrix being coaxial and having overlapping sides. The top surface of the diamond layer is provided with a chip removal groove, which extends through the straight edge of the diamond layer; The bottom of the chip removal grooves of the two types of grooved diamond composite sheets are both arc-shaped, with a chip removal groove depth of h and a diamond layer thickness of H, where 1 / 3H≤h≤2 / 3H; the width of the chip removal groove is a; and the diameter of the diamond layer is A, where 1 / 3A≤a≤1 / 2A. The main feed composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet, the reaming composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet, and the auxiliary composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet; the grooved diamond composite sheet is inclined, with the chip removal groove on the side closer to the axis of the coreless drill bit being higher than the other side; the angle between the axis of the chip removal groove of the grooved diamond composite sheet and the axis of the shank is β, 30°≤β≤50°.

7. The coreless drill bit according to claim 6, characterized in that: All main feed composites, all reaming composites, and all auxiliary composites are grooved diamond composites; alternatively, a portion of the main feed composites on several wings are grooved diamond composites, and another portion are planar diamond composites, with the grooved and planar diamond composites distributed alternately; a portion of the reaming composites on several wings are grooved diamond composites, and another portion are planar diamond composites, with the grooved and planar diamond composites distributed alternately; a portion of the auxiliary composites on the auxiliary wings are grooved diamond composites, and another portion are planar diamond composites, with the grooved and planar diamond composites distributed alternately.

8. A core drill bit, comprising an integral shank and several wings, a core hole in the middle of the shank, an installation thread at the tail of the shank, several wings surrounding the front end of the shank, a main feed compound and a reaming compound on the wings, the reaming compound being located at the outer edge of the wing, the main feed compound being located inside the reaming compound, and at least two reaming compounds being arranged on the same circumference; characterized in that: It also includes the grooved diamond composite sheet as described in claim 2; The main feed composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet, and the hole-expanding composite sheet is a grooved diamond composite sheet or a planar diamond composite sheet; the included angle between the axis of the chip removal groove of the grooved diamond composite sheet and the axis of the shank is greater than or equal to 30° and less than or equal to 50°.

9. The coring drill bit according to claim 8, characterized in that: All main feed composite sheets are grooved diamond composite sheets, and all reaming composite sheets are grooved diamond composite sheets; or, a portion of the main feed composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately; a portion of the reaming composite sheets on several wings are grooved diamond composite sheets, and another portion are planar diamond composite sheets, with the grooved diamond composite sheets and planar diamond composite sheets distributed alternately.

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