High-precision concentricity cutter

Abstract

The utility model discloses a kind of high-precision cutters of concentricity, including tool head and shank, tool head is provided with outer thread section, shank is provided with the inner thread hole compatible with outer thread section, tool head is provided with circular platform between outer thread section, and the end portion of tool head and circular platform is connected and is provided with tool head conical surface;The upper portion of inner thread hole is provided with the groove compatible with circular platform, the upper end portion of shank is provided with the shank conical surface compatible with tool head conical surface.The utility model high-precision cutter of concentricity, by optimizing the connecting structure of tool head and shank, realize accurate radial and axial positioning, to improve the concentricity of cutter, reduce vibration and deviation when high-speed rotation, improve machining surface quality and cutter service life.Coincidence of tool head conical surface and shank conical surface and the cooperation of circular platform and groove, accurate positioning is realized jointly in radial and axial, significantly improve cutter concentricity, reduce vibration when high-speed rotation.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a high-precision cutting tool with high concentricity. Background Technology

[0002] In the field of machining, the concentricity of cutting tools is a key factor affecting machining accuracy and surface quality. Traditional cutting tools typically use a threaded connection to fix the tool tip and tool holder, such as a single-start thread structure. While this connection method is simple, it has significant drawbacks: First, single-start threads are prone to misalignment during tightening, causing the axes of the tool tip and tool holder to not coincide, resulting in low concentricity. Second, during high-speed rotation, uneven force can easily cause vibration and deviation, reducing machining stability and even leading to tool damage. Furthermore, existing cutting tools lack effective radial and axial positioning structures; relying solely on threaded connections is insufficient to ensure precise alignment, and long-term thread wear further exacerbates the concentricity reduction problem.

[0003] Therefore, there is an urgent need in this field for a tool connection solution with a reasonable structure, high concentricity, and good stability. This invention is proposed against this backdrop, effectively overcoming the shortcomings of existing technologies through comprehensive optimization of multiple positioning structures. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high-precision concentricity cutting tool. By optimizing the connection structure between the tool head and the tool holder, precise radial and axial positioning is achieved, thereby improving the concentricity of the tool, reducing vibration and deviation during high-speed rotation, and enhancing the surface quality and tool life.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A high-precision concentric cutting tool includes a cutting head and a tool holder. The cutting head is provided with an external threaded section, and the tool holder is provided with an internal threaded hole adapted to the external threaded section. A frustum is provided between the cutting head and the external threaded section, and the end of the cutting head connected to the frustum is provided with a cutting head tapered surface. The upper part of the internal threaded hole is provided with a groove adapted to the frustum, and the upper end of the tool holder is provided with a tool holder tapered surface adapted to the cutting head tapered surface.

[0006] Furthermore, the external thread section has a multi-start thread structure.

[0007] Furthermore, the multi-start thread structure consists of three threads, which are evenly distributed on the circumference.

[0008] Furthermore, the diameter of the frustum is larger than the outer diameter of the external thread section.

[0009] Furthermore, the cone angle of the cutter head cone surface is the same as that of the cutter shank cone surface.

[0010] Furthermore, the outer wall of the frustum fits into the inner wall of the groove.

[0011] Furthermore, the axial height of the frustum is less than or equal to the depth of the groove, such that when the conical surface of the cutter head and the conical surface of the cutter shank are fully in contact, there is a small gap or just contact between the end face of the frustum and the bottom surface of the groove.

[0012] Furthermore, the blade tip and handle are made of alloy steel or tungsten steel.

[0013] Compared with existing technologies, the technical solution of this patent achieves the following beneficial effects: 1. By combining the frustum and the groove, and by fitting the conical surface of the cutter head with the conical surface of the cutter shank, precise radial and axial positioning is achieved, significantly improving the concentricity of the cutter and reducing vibration during high-speed rotation.

[0014] 2. The external thread section adopts a multi-start thread structure (such as three-thread) to ensure uniform stress distribution, avoid stress concentration on one side, improve connection balance and stability, and reduce the risk of thread damage.

[0015] 3. The diameter of the truncated cone is larger than the outer diameter of the external thread section, forming an effective stop structure to prevent the cutter head from being excessively screwed into the tool holder, ensuring accurate fit of the tapered surface and enhancing connection rigidity.

[0016] 4. The cone angles of the cutter head's conical surface and the cutter shank's conical surface are the same, ensuring a complete fit and forming a large area of ​​surface contact, thus improving connection accuracy and overall stability.

[0017] 5. The cutting head material is made of alloy steel or tungsten steel, which has high hardness, high wear resistance and good toughness, extending the tool life and making it suitable for high-precision machining needs. Attached Figure Description

[0018] Figure 1 The diagram shown is an exploded view of the cutting tool of this utility model. Figure 2 The figure shown is a cross-sectional view of the exploded state of the cutting tool of this utility model. Figure 3 As shown Figure 2 A magnified schematic diagram of the AA section in the diagram; Figure 4 The diagram shown is a schematic representation of the structure of the knife handle of this utility model. Figure 5 The diagram shown is a schematic diagram of the assembly structure of the cutting tool of this utility model; Figure 6 The diagram shows a cross-sectional view of the assembled cutting tool of this utility model.

[0019] In the diagram: 1. Cutting head; 2. Cutting shank; 3. External thread section; 4. Internal thread hole; 5. Frustum; 6. Tapered surface of cutting head; 7. Groove; 8. Tapered surface of cutting shank; 31. First thread; 32. Second thread; 33. Third thread. Detailed Implementation

[0020] 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.

[0021] See Figure 1-6 As shown, this embodiment provides a high-precision concentricity cutting tool, including a cutting head 1 and a tool holder 2. The cutting head 1 is provided with an external thread section 3, and the tool holder 2 is provided with an internal thread hole 4 adapted to the external thread section 3. A frustum 5 is provided between the cutting head 1 and the external thread section 3, and the end of the cutting head 1 connected to the frustum 5 is provided with a cutting head conical surface 6. The upper part of the internal thread hole 4 is provided with a groove 7 adapted to the frustum 5, and the upper end of the tool holder 2 is provided with a tool holder conical surface 8 adapted to the cutting head conical surface 6. By setting the frustum 5, the cutting head conical surface 6, and the tool holder conical surface 8, when the cutting head 1 is connected to the tool holder 2, the cooperation between the frustum 5 and the groove 7 and the fit of the conical surface work together to achieve precise radial and axial positioning of the cutting head 1, effectively improving the concentricity of the tool, reducing vibration and deviation during high-speed rotation, thereby improving the quality of the machined surface and the stability of the tool.

[0022] The external thread section 3 is a multi-start thread structure, consisting of a first thread 31, a second thread 32, and a third thread 33, which are evenly distributed spirally on the circumferential surface. This multi-start thread structure design ensures uniform stress on the thread, avoids stress concentration on one side, improves the balance and stability of the connection between the cutter head 1 and the cutter holder 2, further guarantees high concentricity, and reduces the risk of thread damage.

[0023] The diameter of the frustum 5 is larger than the outer diameter of the external thread section 3. This larger diameter of the frustum 5 creates an effective stop structure in the groove 7, preventing the cutter head 1 from excessively screwing into the shank 2, ensuring the accuracy of the tapered surface fit, and enhancing the rigidity of the connection.

[0024] The cone angles of the cutting head tapered surface 6 and the cutting shank tapered surface 8 are the same. This ensures that the two tapered surfaces can completely fit together, forming a large surface contact area, which improves connection accuracy and the overall stability of the cutting tool.

[0025] The outer wall of the frustum 5 fits into the inner wall of the groove 7. The fit between the frustum 5 and the groove 7 provides strong and direct radial support, which can effectively resist the radial force generated during cutting, greatly enhance the overall rigidity of the tool, and play a decisive role in ensuring high concentricity and suppressing vibration.

[0026] The axial height of the frustum 5 is less than or equal to the depth of the groove 7, ensuring that when the conical surface 6 of the tool head and the conical surface 8 of the tool holder are fully engaged, there is a slight gap or just contact between the end face of the frustum 5 and the bottom surface of the groove 7. The axial height of the frustum 5 is matched with the depth of the groove 7, allowing the conical surfaces to engage preferentially, while the end face of the frustum maintains a slight gap or just contact with the bottom surface of the groove. This avoids over-positioning issues, ensures that the conical surface undertakes the main positioning function, and improves concentricity accuracy and connection reliability.

[0027] The tool head 1 and tool holder 2 are made of alloy steel or tungsten steel. The tool head 1 is made of alloy steel or tungsten steel, which have high hardness, high wear resistance and good toughness, extending tool life, suitable for high-precision machining requirements and reducing replacement frequency.

[0028] During assembly, the cutter head 1 engages with the internal threaded hole 4 of the tool holder 2 via the external threaded section 3. The multi-start thread structure evenly distributes stress during tightening, avoiding unilateral force and initially ensuring centering. As tightening occurs, the frustum 5 enters the groove 7. The fit between the frustum 5 and the groove 7 provides direct radial support, resisting radial cutting forces and enhancing rigidity. The tapered surface 6 of the cutter head and the tapered surface 8 of the tool holder have the same cone angle, and they fit completely together during tightening, forming surface contact and achieving precise axial positioning. Through this mechanism, the tool maintains high concentricity during high-speed rotation, significantly reducing vibration and thus improving machining accuracy and stability.

Claims

1. A high-precision concentric cutting tool, comprising a cutting head (1) and a cutting shank (2), wherein the cutting head (1) is provided with an external thread section (3), and the cutting shank (2) is provided with an internal thread hole (4) adapted to the external thread section (3), characterized in that, A frustum (5) is provided between the cutting head (1) and the external thread section (3), and a cutting head tapered surface (6) is provided at the end of the cutting head (1) connected to the frustum (5); a groove (7) adapted to the frustum (5) is provided at the upper part of the internal thread hole (4), and a cutting head tapered surface (8) adapted to the cutting head tapered surface (6) is provided at the upper end of the cutting shank (2).

2. The high-precision concentricity cutting tool according to claim 1, characterized in that, The external thread section (3) has a multi-start thread structure.

3. The high-precision concentricity cutting tool according to claim 2, characterized in that, The multi-start thread structure consists of three threads, which are evenly distributed on the circumference.

4. The high-precision concentricity cutting tool according to claim 1, characterized in that, The diameter of the frustum (5) is greater than the outer diameter of the external thread section (3).

5. The high-precision concentricity cutting tool according to claim 1, characterized in that, The cone angle of the cutter head cone surface (6) is the same as that of the cutter handle cone surface (8).

6. The high-precision concentricity cutting tool according to claim 1, characterized in that, The outer wall of the frustum (5) is in contact with the inner wall of the groove (7).

7. The high-precision concentricity cutting tool according to claim 1, characterized in that, The axial height of the frustum (5) is less than or equal to the depth of the groove (7), such that when the tip conical surface (6) and the handle conical surface (8) are fully in contact, there is a small gap or just contact between the end face of the frustum (5) and the bottom surface of the groove (7).

8. The high-precision concentricity cutting tool according to claim 1, characterized in that, The blade (1) and the handle (2) are made of alloy steel or tungsten steel.

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