A large-diameter composite blade with a sawtooth groove and a small-diameter drill bit

Abstract

The utility model discloses a sawtooth groove shape big diameter composite sheet and small diameter drill bit, sawtooth groove shape big diameter composite sheet includes hard alloy base body, is equipped with the diamond layer that becomes through high temperature high pressure sintering on the hard alloy base body, the hard alloy base body is the round sheet sawtooth groove shape structure. Small diameter drill bit contains a plurality of small cutter particles that are cut and processed by the sawtooth groove shape big diameter composite sheet. The utility model discloses hard alloy base body adopts the top sawtooth groove design, and the section line is symmetrical distribution as the center, strengthens the mechanical occlusal force and the torsional resistance of composite sheet, is applicable to high load cutting scene. The utility model discloses can cut and process into 4-8mm small cutter particle, and flexible adaptation different specifications drill bit, reduces production cost and improves material utilization.

Description

Technical Field

[0001] This utility model relates to the technical field of superhard materials and their products, specifically a serrated groove-shaped large-diameter composite sheet and a small-diameter drill bit. Background Technology

[0002] Diamond composite sheets (PDC) are made by sintering diamond micropowder with a cemented carbide matrix under high temperature and high pressure. Due to their superior performance, their application fields are becoming increasingly wide. In recent years, the 3C industry, aerospace, and ceramics industry have developed rapidly, resulting in a huge increase in the corresponding small hole machining volume. Various diamond mini drill bits have emerged, including polycrystalline diamond mini drill bits, sandwich diamond composite mini drill bits, electroplated diamond mini drill bits, and sintered diamond mini drill bits. In comparison, polycrystalline diamond drill bits and sandwich diamond composite mini drill bits synthesized under high temperature and high pressure have good diamond holding power, and the drill bits made from them have better and more stable performance. However, these two types of mini drill bits are relatively expensive. The market needs more cost-effective high temperature and high pressure synthesized composite mini drill bits. This utility model is a sawtooth groove-shaped large-diameter composite sheet and its application. It is a diamond composite sheet developed with market orientation, suitable for making mini drill bits. One diamond composite sheet can be cut into hundreds of drill bits, producing a considerable number of mini drill bits, which can significantly reduce the production cost of mini drill bits and has a high cost performance.

[0003] There are no reports of production or research on large-diameter sawtooth-groove composite sheets in China, nor are there any patented methods or literature on the manufacture of such small-diameter drill bits. A relatively close related patent is the sandwich composite sheet patent, CN221481849U, from Funek Superhard Materials Co., Ltd., which places diamond in the middle layer and cemented carbide layers on both sides. This type of composite sheet can be used to manufacture small-diameter drill bits, but it is very expensive, and the high stress in the composite sheet can easily lead to cracks in the diamond layer of the small drill bit, making it difficult to promote its application. Shenzhen Muji's polycrystalline diamond end mill patent CN 111112713 A describes similar end mills and drill bits, but their manufacturing costs are also high. Other market products, such as 1308 ridge teeth or similar inverted V-shaped diamond composite sheets, are all small-diameter composite sheets, generally used in combination for different applications. Even when these composite sheets are used to make drill bits, the cost is still relatively high. This patent describes a serrated groove-shaped large-diameter composite sheet and its application. It utilizes diamond and a serrated groove matrix synthesized under high temperature and pressure. The diamond has strong holding force, resulting in high-performance small drill bits. Each composite sheet can cut a large number of small cutting bits, reducing the unit cost of small drill bits. The produced small drill bits combine sharpness and long life, offering good cost performance. Utility Model Content

[0004] This invention provides a serrated groove-shaped large-diameter composite sheet and a small-diameter drill bit, solving the problems of high cost and easy cracking of the diamond layer in existing small-diameter drill bits.

[0005] To solve the above-mentioned technical problems, this utility model provides a sawtooth groove-shaped large-diameter composite sheet, including a cemented carbide substrate, on which a diamond layer formed by high temperature and high pressure sintering is provided, and the cemented carbide substrate is a circular sawtooth groove structure.

[0006] The circular sawtooth groove structure includes a flat bottom surface and a top surface with sawtooth grooves, wherein the sawtooth grooves are symmetrically distributed around the cross-sectional line of the cemented carbide substrate.

[0007] Wherein, the diameter of the cemented carbide substrate is ≥50mm, the total thickness of the cemented carbide substrate is ≤6mm, and the thickness of the diamond layer is ≤4.5mm.

[0008] The total thickness of the composite sheet is ≤10mm.

[0009] The tooth tip angle of the sawtooth groove ranges from 60° to 120°, the groove width ranges from 3 to 12 mm, and the groove depth ranges from 1 to 4 mm.

[0010] The top and bottom corners of the sawtooth groove are rounded, with a radius R ranging from 1 to 2 mm.

[0011] This utility model also provides a small-diameter drill bit with a diameter of 4-8mm, which includes several small cutting bits cut and processed from the aforementioned sawtooth groove-shaped large-diameter composite sheet. Beneficial effects

[0012] This utility model provides a sawtooth groove-shaped large-diameter composite sheet and a small-diameter drill bit, which have the following beneficial effects: 1. This utility model features a cemented carbide substrate with a top-surface serrated groove design, symmetrically distributed around the cross-section line, enhancing the mechanical interlocking force and torsional resistance of the composite sheet, making it suitable for high-load cutting scenarios. The top and bottom of the serrated grooves are rounded with a radius of 1-2mm to reduce stress concentration and extend tool life.

[0013] 2. The base diameter of this utility model is ≥50mm, the total thickness is ≤10mm, and the diamond layer is ≤4.5mm. It achieves lightweight while ensuring strength, making it suitable for efficient cutting and deep hole machining.

[0014] 3. The diamond layer sintered under high temperature and high pressure of this invention is tightly bonded to the cemented carbide matrix, which significantly improves wear resistance and thermal stability, and is suitable for processing high-hardness materials.

[0015] 4. This utility model can be cut into small cutting pieces of 4-8mm, which can be flexibly adapted to different specifications of drill bits, reducing production costs and improving material utilization. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the cemented carbide matrix in this utility model; Figure 2 This is a top view of the hard alloy matrix structure in this utility model; Figure 3 This is a schematic diagram of the serrated groove-shaped large-diameter composite sheet in this utility model; Figure 4 This is a schematic diagram of the structure of the small blade in this utility model.

[0017] In the diagram: 1. Hard alloy substrate; 11. Top surface; 12. Bottom surface; 13. Serrated groove; 14. Tooth tip angle; 15. Section line; 2. Diamond layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0019] like Figures 1-3 As shown, this embodiment provides a sawtooth-groove-shaped large-diameter composite sheet, including a cemented carbide substrate 1, on which a diamond layer 2 formed by high-temperature and high-pressure sintering is disposed. The cemented carbide substrate 1 has a circular sawtooth-groove structure. The composition of the diamond layer 2 in this invention is as follows: diamond micron powder with a particle size of 1-5µm, content of 85-95%, combined with an appropriate amount of nano-sized (≤150nm) diamond micron powder and a binder. Other diamond powders currently disclosed for drill bits can also be used. In this embodiment, the main particle size of the diamond micron powder is 1-5 micrometers, content of 90%; 100nm diamond micron powder is 5%; and the binder is 0.8-micrometer cobalt powder. The high-temperature and high-pressure sintered diamond layer 2 is tightly bonded to the cemented carbide substrate 1, significantly improving wear resistance and thermal stability, and is suitable for processing high-hardness materials.

[0020] The circular sawtooth groove structure includes a flat bottom surface 12 and a top surface 11 with sawtooth grooves 13. The sawtooth grooves 13 are symmetrically distributed around the cross-sectional line 15 of the cemented carbide substrate 1, which enhances the mechanical interlocking force and anti-torsion performance of the composite sheet and is suitable for high-load cutting scenarios.

[0021] The cemented carbide substrate 1 has a diameter of 61.4 mm and a total thickness of 4.7 mm, while the composite sheet has a total thickness of 5.8 mm. This large-diameter, thin-body design achieves lightweight construction while maintaining strength, making it suitable for efficient cutting and deep-hole machining. The serrated groove 13 has a tooth tip angle 14 ranging from 120°, a groove width ranging from 6.2 mm, and a groove depth of 1.8 mm, balancing chip removal efficiency with structural strength.

[0022] The top and bottom tooth tips 14 of the sawtooth groove 13 are rounded, with a radius R of 1mm. This reduces stress concentration and extends tool life. Example 2

[0023] like Figure 4 As shown, this utility model also provides a small-diameter drill bit with a diameter of 4-8mm, comprising several small cutting bits cut and processed from the aforementioned serrated groove-shaped large-diameter composite sheet. The serrated groove-shaped large-diameter composite sheet in this utility model can be cut and processed into 6mm small cutting bits, flexibly adapting to different drill bit specifications, reducing production costs and improving material utilization.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A serrated groove-shaped large-diameter composite sheet, comprising a cemented carbide substrate, characterized in that: The cemented carbide substrate has a diamond layer formed by high temperature and high pressure sintering. The cemented carbide substrate has a circular sawtooth groove structure. The circular sawtooth groove structure includes a flat bottom surface and a top surface with sawtooth grooves. The sawtooth grooves are symmetrically distributed with the cross-sectional line of the cemented carbide substrate as the center. The tooth tip angle of the sawtooth groove is in the range of 60°-120°, the groove width is in the range of 3-12mm, and the groove depth is 1-4mm.

2. The sawtooth groove-shaped large-diameter composite sheet according to claim 1, characterized in that: The diameter of the cemented carbide substrate is ≥50mm, the total thickness of the cemented carbide substrate is ≤6mm, and the thickness of the diamond layer is ≤4.5mm.

3. The sawtooth groove-shaped large-diameter composite sheet according to claim 2, characterized in that: The total thickness of the composite sheet is ≤10mm.

4. The sawtooth groove-shaped large-diameter composite sheet according to claim 1, characterized in that: The top and bottom tooth tips of the sawtooth groove are rounded, with a radius R ranging from 1 to 2 mm.

5. A small-diameter drill bit, characterized in that: It has a diameter of 4-8mm and contains several small blades cut and processed from the serrated groove-shaped large-diameter composite sheet as described in any one of claims 1-4.

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