Pinhole PCD rough and fine boring combined cutter

Abstract

The utility model provides a small hole PCD rough and fine boring combined cutter which comprises a cutter handle. A tool bit; the cutter head is integrally arranged at the front end of the cutter handle; a notch section is arranged at the front end of the tool bit; the notch section is provided with a first mounting part and a second mounting part; the second mounting part is positioned in the middle of the notch section; a blade; the blade comprises a rough boring cutter and a fine boring cutter; the rough boring cutter is positioned in the first mounting part; the fine boring cutter is positioned in the second mounting part; the notch section is arranged to be an arc-shaped notch. An inclined surface is arranged at the joint of the end part of the notch section and the end part of the tool bit; the diameter of a tool bit of the rough boring tool is smaller than that of a tool bit of the fine boring tool. A rough boring cutter and a fine boring cutter are replaced by one cutter, so that the cutter cost is saved; meanwhile, rough machining and fine machining are completed on the same cutter, the allowance reserved for fine boring by rough boring is designed, cutter position deviation caused by cutter replacement is reduced, and the coaxiality and dimensional precision of holes are guaranteed; rough machining and finish machining of the hole can be completed without replacing the cutter, and the cutter installing and setting time is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining tools, and more specifically, relates to a small hole PCD rough and fine boring combined tool. Background Art

[0002] In the field of machining, traditional high-precision holemaking requires two operations, using a rough boring tool and then a fine boring tool. This requires two tool setups and tool adjustment, increasing tool change time and manual intervention, and extending the machining cycle. These two tool setups can easily cause positional deviations, affecting the coaxiality and dimensional consistency of the hole. Roughing and fine machining require different tool performance, making it difficult for a single tool to meet both requirements, resulting in shortened tool life.

[0003] Existing technologies for integrated roughing and finishing tools often utilize a counter-rotating arrangement, with the roughing and finishing boring tools positioned on either side of the tool head or on either side of the center. While this design achieves integrated roughing and finishing, the symmetrical placement of the teeth limits the minimum machinable aperture to twice the tooth width, making it difficult to meet the machining requirements of micro-precision parts. Furthermore, the counter-rotating arrangement increases the tool's transition zone, reducing rigidity and making it susceptible to vibration that can affect machining quality. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a small hole PCD rough and fine boring combined tool.

[0005] The purpose and effect of the small hole PCD rough and fine boring combination tool of the utility model are achieved by the following specific technical means:

[0006] A small hole PCD rough and fine boring combination tool, comprising:

[0007] knife handle;

[0008] A cutter head; the cutter head is integrally arranged at the front end of the handle; the cutter head is configured as a cylindrical structure; a cutter head front end is provided with a notch section; the notch section is provided with a first mounting portion and a second mounting portion; the first mounting portion is located at the front end of the notch section; the second mounting portion is located in the middle of the notch section;

[0009] Blade; the blade includes a rough boring tool and a fine boring tool; the rough boring tool is located in the first mounting portion; the fine boring tool is located in the second mounting portion;

[0010] The notch section is configured as an arc-shaped notch; a slope is provided at the connection between the end of the notch section and the end of the cutter head; and the diameter of the rough boring tool head is smaller than the diameter of the fine boring tool head.

[0011] Furthermore, the difference between the diameter of the rough boring tool head and the diameter of the fine boring tool head is 0.02mm~1mm.

[0012] Furthermore, the tip of the fine boring tool has an R angle of 0.02mm to 0.5mm.

[0013] Furthermore, the rough boring tool includes a first tool body and a first cutting edge; the first cutting edge and the first tool body are at an angle of 1° to 5° to reduce radial cutting resistance; and the tip of the first cutting edge is an R angle.

[0014] Furthermore, the fine boring tool includes a second tool body and a second cutting edge; the second cutting edge is provided with a protrusion; the rear section of the second cutting edge has a deflection angle of 0.25° to 0.55° for resisting tool tip wear.

[0015] Furthermore, the tool head includes a first tool table and a second tool table located at the rear end; the diameter of the first tool table is smaller than the diameter of the second tool table; the connection between the first tool table and the second tool table is located at the rear side of the second cutting edge protrusion.

[0016] Furthermore, the end of the cutter head is arranged to be a plane; and the end of the second cutting edge is arranged to protrude from the end of the cutter head.

[0017] Furthermore, the tool handle and the tool head are transitionally connected via a frustum structure.

[0018] Furthermore, the first mounting portion is configured as a quarter-circular arc groove; and the second mounting portion is configured as a semicircular arc groove.

[0019] Furthermore, the upper surfaces of the rough boring tool and the fine boring tool are flush with the surface of the incision section.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The utility model adopts the design of same-direction layout and integral welding, in which the coarse and fine cutter teeth are arranged in sequence along the axial direction of the tool, without the need for opposite layout. The minimum hole diameter only requires one times the width of the cutter teeth, which significantly improves the small hole processing capability. At the same time, the integrated cutter head design reduces redundant structure, and the coarse and fine processing is completed in a single clamping, eliminating the tool changing step. The deflection angle of the rough boring tool reduces radial resistance, and the deflection angle of the fine boring tool resists tool tip wear. Combined with the application of PCD materials, the surface finish and tool life are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the present utility model.

[0023] Figure 2 This is a diagram of the cutter head.

[0024] Figure 3 It is a schematic diagram of the blade.

[0025] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0026] 1. Tool handle; 2. Tool head; 21. Cutting section; 211. Arc-shaped notch; 22. First mounting portion; 23. Second mounting portion; 24. Inclined surface; 251. First tool holder; 252. Second tool holder; 3. Blade; 31. Rough boring tool; 311. First tool body; 312. First cutting edge; 32. Fine boring tool; 321. Second tool body; 322. Second cutting edge. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] Example:

[0031] As attached Figure 1 To the attached Figure 3 As shown:

[0032] A small hole PCD rough and fine boring combination tool, comprising:

[0033] Handle 1;

[0034] The cutter head 2 is integrally provided at the front end of the handle 1; the cutter head 2 is configured as a cylindrical structure; a cutter section 21 is provided at the front end of the cutter head 2; the cutter section 21 is provided with a first mounting portion 22 and a second mounting portion 23; the first mounting portion 22 is located at the front end of the cutter section 21; the second mounting portion 23 is located in the middle of the cutter section 21;

[0035] Blade 3; the blade 3 includes a rough boring tool 31 and a fine boring tool 32; the rough boring tool 31 is located in the first mounting portion 22; the fine boring tool 32 is located in the second mounting portion 23;

[0036] The notch section 21 is configured as an arc-shaped notch 211 ; a slope 24 is provided at the connection between the end of the notch section 21 and the end of the cutter head 2 ; the diameter of the cutter head 2 of the rough boring tool 31 is smaller than the diameter of the cutter head 2 of the fine boring tool 32 .

[0037] The diameter difference between the tool head 2 of the rough boring tool 31 and the tool head 2 of the fine boring tool 32 is 0.02 mm to 1 mm.

[0038] The tip of the fine boring tool 32 has an R angle of 0.02 mm to 0.5 mm.

[0039] The rough boring tool 31 includes a first tool body 311 and a first cutting edge 312 ; the first cutting edge 312 is at an angle of 1° to 5° with the first tool body 311 to reduce radial cutting resistance; and the tip of the first cutting edge 312 is at an R angle.

[0040] The rough boring section consists of a PCD cutting edge and a carbide substrate. The cutting edge features a large deflection angle to improve cutting efficiency and chip evacuation, while reducing radial cutting forces. The rough boring head, with a slightly smaller diameter than the fine boring head, removes the bulk of the material, leaving only a small margin for the fine boring head.

[0041] The fine boring tool 32 includes a second tool body 321 and a second cutting edge 322 ; the second cutting edge 322 is convex; and the rear section of the second cutting edge 322 is at an angle of 0.25° to 0.55° to resist tool tip wear.

[0042] The fine boring section also consists of PCD cutting edges and a carbide substrate. The cutting edges are finely ground to a sharp and smooth edge, ensuring high surface precision and low roughness. The fine boring head features a small nose radius to minimize chip resistance during fine boring and reduce dimensional instability caused by insufficient rigidity. Furthermore, the fine boring head features a minimal deflection angle to prevent dimensional reduction due to nose wear.

[0043] The cutter head 2 includes a first cutter platform 251 and a second cutter platform 252 located at the rear end; the diameter of the first cutter platform 251 is smaller than the diameter of the second cutter platform 252; the connection between the first cutter platform 251 and the second cutter platform 252 is located behind the protrusion of the second cutting edge 322.

[0044] The end of the cutter head 2 is set to be flat; the end of the second cutting edge 322 is set to protrude from the end of the cutter head 2.

[0045] The tool handle 1 and the tool head 2 are connected via a frustum structure transition.

[0046] The first mounting portion 22 is configured as a quarter-circular arc groove; the second mounting portion 23 is configured as a semicircular arc groove.

[0047] The upper surfaces of the rough boring tool 31 and the fine boring tool 32 are flush with the surface of the notch section 21 .

[0048] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A small hole PCD rough and fine boring tool, characterized by: include Handle (1); A cutter head (2); the cutter head (2) is integrally arranged at the front end of the handle (1); the cutter head (2) is arranged as a cylindrical structure; a cutter section (21) is arranged at the front end of the cutter head (2); the cutter section (21) is provided with a first mounting portion (22) and a second mounting portion (23); the first mounting portion (22) is located at the front end of the cutter section (21); the second mounting portion (23) is located in the middle of the cutter section (21); A blade (3); the blade (3) comprises a rough boring tool (31) and a fine boring tool (32); the rough boring tool (31) is located in the first mounting portion (22); the fine boring tool (32) is located in the second mounting portion (23); The notch section (21) is configured as an arc-shaped notch (211); a bevel (24) is provided at the connection between the end of the notch section (21) and the end of the cutter head (2); and the diameter of the cutter head (2) of the rough boring tool (31) is smaller than the diameter of the cutter head (2) of the fine boring tool (32).

2. A small hole PCD rough and fine boring tool as claimed in claim 1, characterized in that: The difference between the diameter of the rough boring tool (31) head (2) and the diameter of the fine boring tool (32) head (2) is 0.02 mm to 1 mm.

3. The small hole PCD rough and fine boring tool according to claim 1, characterized in that: The tip of the fine boring tool (32) has an R angle of 0.02 mm to 0.5 mm.

4. The small hole PCD rough and fine boring tool according to claim 1, characterized in that: The rough boring tool (31) comprises a first tool body (311) and a first cutting edge (312); the first cutting edge (312) and the first tool body (311) are at an angle of 1° to 5° to reduce radial cutting resistance; and the tip of the first cutting edge (312) is at an R angle.

5. The small hole PCD rough and fine boring tool as claimed in claim 1, characterized in that: The fine boring tool (32) comprises a second tool body (321) and a second cutting edge (322); the second cutting edge (322) is arranged in a raised manner; and the rear section of the second cutting edge (322) has a deflection angle of 0.25° to 0.55° for resisting tool tip wear.

6. A small hole PCD rough and fine boring tool as claimed in claim 5, characterized in that: The tool head (2) comprises a first tool platform (251) and a second tool platform (252) located at the rear end; the diameter of the first tool platform (251) is smaller than the diameter of the second tool platform (252); and the connection between the first tool platform (251) and the second tool platform (252) is located behind the protrusion of the second cutting edge (322).

7. The small hole PCD rough and fine boring tool as claimed in claim 5, characterized in that: The end of the cutter head (2) is arranged to be a plane; the end of the second cutting edge (322) is arranged to protrude from the end of the cutter head (2).

8. The small hole PCD rough and fine boring tool as claimed in claim 1, characterized in that: The knife handle (1) and the knife head (2) are transitionally connected via a frustum structure.

9. The small hole PCD rough and fine boring tool as claimed in claim 1, characterized in that: The first mounting portion (22) is configured as a quarter-circular arc groove; and the second mounting portion (23) is configured as a semicircular arc groove.

10. The small hole PCD rough and fine boring tool as claimed in claim 1, characterized in that: The upper surfaces of the rough boring tool (31) and the fine boring tool (32) are flush with the surface of the notch section (21).

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