Large diameter double chip-row internal slot boring tool

Abstract

This utility model relates to the field of boring tool technology and discloses a large-diameter double-chip-removal-groove boring tool for internal slots, including a tool holder and a large-diameter cutting head. The tool holder has a mounting hole, a first chip-removal groove, and a second chip-removal groove. The large-diameter cutting head is disposed at one end of the tool holder for cutting internal slots in the workpiece. A reinforcing rib is disposed at the connection between the large-diameter cutting head and the tool holder to enhance connection rigidity. A cooling hole penetrates the tool holder, the reinforcing rib, and the large-diameter cutting head to enhance heat dissipation. In this utility model, the first and second chip-removal grooves are circumferentially distributed along the connection area between the tool holder and the cutting head, and adopt an arc transition design, thereby improving cutting stability and ensuring smooth chip removal. This solves the problems of machining interruption and accelerated tool wear caused by poor chip removal in traditional internal slot machining, and improves machining efficiency in scenarios with high chip removal requirements such as deep holes and complex internal slots.

Description

Technical Field

[0001] This utility model relates to the field of boring tool technology, and in particular to a boring tool for large-diameter double chip-removing grooves. Background Technology

[0002] In the field of machining, internal slotting is one of the key processes for achieving precision forming of complex parts. It is widely used in high-end equipment fields such as aerospace, automobile manufacturing, and mold processing. As industrial products continue to demand higher precision and complexity from parts, the demand for difficult-to-machine structures such as deep-hole internal slots and irregular-shaped internal slots is increasing. These machining scenarios place higher demands on the chip removal capability and cutting stability of cutting tools. The large-diameter double-chip-removal-groove internal slotting boring tool is a core tool specifically designed for internal slotting. Its design purpose is to solve the pain points of poor chip removal and low cutting efficiency in traditional internal slotting. By optimizing the tool structure to adapt to machining conditions with high chip removal requirements, it ensures stable tool operation during deep-hole and complex internal slotting, while improving machining accuracy and production efficiency, thus meeting the urgent needs of modern mechanical manufacturing for efficient and precise machining.

[0003] Currently, the mainstream boring tools used in the field of internal slotting are mostly single-chickness structures. In some simple working conditions, even general-purpose boring tools without dedicated chip removal grooves are used. From a technical point of view, existing boring tools remove material through the relative rotational motion of the cutting edge of the tool head and the workpiece. The chips are mainly discharged outward by the centrifugal force generated during the cutting process, combined with the natural space gap of the machining area. For deep hole internal slotting, some technical solutions will increase the diameter of the tool holder or adjust the cutting edge angle to assist chip removal, but in essence, they still rely on a single chip removal channel or passive chip removal mechanism. In addition, the tooth diameter design of existing boring tools is mostly adapted to conventional hole diameters and has not been optimized for the characteristics of "large cutting volume and high chip removal pressure" in internal slotting. The overall structure focuses more on basic cutting functions and lacks targeted design for improving chip removal efficiency.

[0004] Existing technologies suffer from significant low chip removal efficiency in practical applications. In deep hole internal groove or high-hardness material machining scenarios, existing boring tools mostly use single chip grooves or lack dedicated chip removal structures, leading to chip accumulation and blockage in the cutting area. Specifically, chips cannot be quickly discharged through a single chip removal channel, and some chips adhere to the space between the tool head and the workpiece inner wall. This not only requires frequent pauses in machining for manual chip removal, resulting in machining interruptions and a significant reduction in production efficiency, but also causes continuous friction between the accumulated chips and the cutting edge of the tool head, accelerating tool wear, shortening tool life, and even causing tool jamming due to chip blockage, affecting machining accuracy. This makes it difficult to meet the continuous and stable production requirements for internal groove hole machining with high chip removal demands. Therefore, a large-diameter double chip groove internal groove boring tool is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a large-diameter double chip removal groove internal slot boring tool, which aims to improve the low chip removal efficiency caused by insufficient chip removal channel design in the existing internal slot machining, thereby causing machining interruption and accelerated tool wear.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a large-diameter double-chip-removal-groove internal slot boring tool, comprising: The tool holder and the large-diameter cutting head are provided. The tool holder has a mounting hole, a chip removal groove 1, and a chip removal groove 2 inside. The large-diameter cutting head is located at one end of the tool holder and is used to cut the inner groove hole of the workpiece to be machined. A reinforcing rib is provided at the connection between the large-diameter cutter head and the cutter shank to enhance the connection rigidity; Cooling holes are provided through the tool holder, reinforcing ribs, and large-diameter tool tip to enhance heat dissipation of the large-diameter tool tip; A wear-resistant coating is applied to the surface of the cutting edge of the large-diameter cutter head to improve its wear resistance and high-temperature resistance. A counterweight assembly is disposed inside the tool holder to balance the centrifugal force when the tool rotates at high speed.

[0007] The above technical solution achieves efficient cutting and enhanced connection rigidity during internal slot machining.

[0008] Preferably, the counterweight assembly includes a high-density counterweight block, which is disposed inside the tool holder.

[0009] The above technical solution achieves the effect of balancing the centrifugal force of high-speed rotation.

[0010] Preferably, the diameter of the cooling holes in the tool holder, reinforcing rib, and large-diameter tool head is consistent, and the inner wall of the cooling holes is polished.

[0011] The above technical solution achieves the effects of heat dissipation and auxiliary chip removal.

[0012] Preferably, the reinforcing rib is integrally formed at the connection between the large-diameter cutter head and the handle, and its two ends are respectively fixed to the root of the large-diameter cutter head and the end of the handle, thereby strengthening the structural rigidity of the connection.

[0013] The above technical solution achieves the effect of avoiding deformation or breakage of the connection parts.

[0014] Preferably, the high-density counterweight is made of high-density cast iron and is installed in the internal cavity of the tool holder through a mounting hole.

[0015] The above technical solution achieves convenient installation and fixation of the counterweight.

[0016] Preferably, the wear-resistant coating is made of titanium nitride, and the wear-resistant coating covers the cutting edge surface of the large-diameter cutter head.

[0017] The above technical solution achieves the effect of extending the service life of the cutter head.

[0018] Preferably, the shape of the high-density counterweight is perfectly matched to the shape of the internal cavity of the knife handle, and the outer wall of the high-density counterweight is tightly fitted to the inner wall of the cavity.

[0019] The above technical solution achieves the effect of reducing cutting vibration.

[0020] This utility model has the following beneficial effects: 1. In this utility model, the large-diameter cutting head enhances cutting stability by increasing the cutting contact area. Chip removal groove one and chip removal groove two are distributed circumferentially along the connection area between the tool holder and the cutting head, and adopt an arc transition design, which greatly widens the chip removal channel capacity. At the same time, it guides the chips to be discharged in an orderly manner along the spiral trajectory, thereby achieving the effect of improving cutting stability and ensuring smooth chip removal. It solves the problem of machining interruption and accelerated tool wear caused by poor chip removal in traditional internal groove hole machining, and improves the machining efficiency in scenarios with high chip removal requirements such as deep holes and complex internal grooves.

[0021] 2. In this utility model, the reinforcing ribs can strengthen the connection rigidity between the tool tip and the tool holder, extending the overall life of the tool. The cooling holes can improve the cooling performance, preventing the tool tip from being affected by thermal deformation and thus improving the machining accuracy. At the same time, the flushing effect of the coolant can also assist in chip removal, further optimizing the chip removal effect. The high-density counterweight can adjust the center of gravity distribution of the tool, thereby achieving the effects of strengthening the tool rigidity and balancing centrifugal force. This solves the problems of tool deformation after long-term use and chatter in deep hole machining, improving the tool's service life and machining accuracy stability. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the large-diameter double-chip-row internal slot boring tool proposed in this utility model; Figure 2 This is a schematic diagram of the tool holder structure of the large-diameter double-chip-row internal slot boring tool proposed in this utility model; Figure 3 This is a schematic diagram of the high-density counterweight structure of the large-diameter double-chip-removal-groove boring tool proposed in this utility model. Figure 4 This is a schematic diagram of the mounting hole for the large-diameter double-chip-removal-groove boring tool proposed in this utility model. Figure 5This is a schematic diagram of the cross-sectional structure of the large-diameter tool head of the large-diameter double chip-removing groove boring tool proposed in this utility model. Explanation of reference numerals in the attached diagram: 1. Tool holder; 2. Large diameter tool tip; 3. Chip removal groove one; 4. Chip removal groove two; 5. Reinforcing rib; 6. Cooling hole; 7. Mounting hole; 8. High-density counterweight; 9. Wear-resistant coating. Detailed Implementation

[0023] 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.

[0024] Reference Figure 1 - Figure 5 One embodiment of this utility model provides a large-diameter double-chip-row internal slot boring tool, comprising: The tool holder 1 and the large-diameter cutting head 2 are provided. The tool holder 1 is cylindrical in shape. The end away from the large-diameter cutting head 2 is provided with a clamping section that is adapted to the machine tool spindle. The large-diameter cutting head 2 is disc-shaped. Its outer diameter is designed according to the machining size of the inner groove hole. The edge of the large-diameter cutting head 2 is evenly distributed with sharp cutting edges. The cutting edges adopt the form of a rounded transition cutting edge to ensure coaxiality and torque transmission efficiency when connected to the spindle. The tool holder 1 has a mounting hole 7, a chip removal groove 1 3, and a chip removal groove 2 4. Both chip removal groove 1 3 and chip removal groove 2 4 are opened inside the transition section of the tool holder 1 and are distributed along the circumference of the transition section to ensure the force balance during chip removal. The large-diameter cutting head 2 is set at one end of the tool holder 1 and is used to cut the inner groove hole of the workpiece. The reinforcing rib 5 adopts a plate-like structure and is integrally formed at the connection between the large-diameter cutter head 2 and the tool holder 1. Its upper end face is completely fitted with the root end face of the large-diameter cutter head 2, and its lower end face is tightly connected with the end face of the transition section of the tool holder 1. It does not affect the chip discharge, and can disperse the radial and axial forces generated during cutting through its own structural strength, effectively suppressing the deformation of the connection between the large-diameter cutter head 2 and the tool holder 1, further strengthening the structural rigidity of this key part, and avoiding the risk of loosening or breakage of the connection after long-term processing. It is set at the connection between the large-diameter cutter head 2 and the tool holder 1 to enhance the connection rigidity. Cooling hole 6 adopts a through-type design, starting from the end of the clamping section of tool holder 1, passing through the transition section of tool holder 1 and reinforcing rib 5 in sequence, and finally extending to the cutting edge area of ​​large diameter cutting head 2. In order to ensure smooth flow of coolant and stable pressure, the diameter of cooling hole 6 in tool holder 1, reinforcing rib 5 and large diameter cutting head 2 is completely consistent, without steps or diameter change structures. At the same time, the inner wall of cooling hole 6 is finely polished, the surface roughness is controlled to an extremely low range, and the connecting edges of the hole wall and each component are all rounded to facilitate rapid heat dissipation and assist in flushing chips, improving chip removal efficiency. Cooling hole 6 is set through tool holder 1, reinforcing rib 5 and large diameter cutting head 2 to enhance the heat dissipation of large diameter cutting head 2. Wear-resistant coating 9 is applied uniformly to the critical areas of the cutting edge of the large-diameter cutter head 2, including the rake face, flank face, and the transition arc of the cutting edge. The coating coverage extends 1-2 mm beyond the effective working area of ​​the cutting edge, forming a complete protective boundary to prevent rapid wear of the cutting edge due to lack of coating. It is applied to the surface of the cutting edge of the large-diameter cutter head 2 to improve its wear resistance and high-temperature resistance. The counterweight assembly is located inside the tool holder 1 to balance the centrifugal force when the tool rotates at high speed. The counterweight assembly includes a high-density counterweight block 8, which is located inside the tool holder 1. The cooling holes 6 have the same diameter in the tool holder 1, the reinforcing rib 5, and the large-diameter cutting head 2, and the inner wall of the cooling holes 6 is polished. The reinforcing rib 5 is integrally formed at the connection between the large-diameter cutting head 2 and the tool holder 1, and its two ends are fixed to the root of the large-diameter cutting head 2 and the end of the tool holder 1, respectively, to strengthen the structural rigidity of this part. The high-density counterweight block 8 is made of high-density cast iron and is embedded in the internal cavity of the tool holder 1 through the mounting hole 7. The wear-resistant coating 9 is made of titanium nitride and covers the cutting edge surface of the large-diameter cutting head 2. The shape of the high-density counterweight block 8 is perfectly matched with the shape of the internal cavity of the tool holder 1, and the outer wall of the high-density counterweight block 8 is tightly fitted with the inner wall of the cavity.

[0025] Working principle: When using this large-diameter double chip-removing groove boring tool, first connect the tool holder 1 to the machine tool spindle, and then drive the tool to rotate through the machine tool. The cutting process achieves the desired cutting effect. The cutting edge of the large-diameter cutter head 2 then contacts the machining surface of the workpiece's inner groove. Utilizing the increased cutting contact area of ​​the large-diameter cutter head 2, material removal is completed in a more stable cutting state. During the cutting process, the generated chips are discharged along chip removal grooves 1-3 and 2-4 under the combined action of centrifugal force and cutting motion. Chip removal grooves 1-3 and 2-4 guide the chips towards the tool holder 1 via a circular arc transition, thus preventing chip accumulation in the machining area. Simultaneously, the cooling holes 6 increase the heat dissipation area of ​​the large-diameter cutter head, allowing for better cooling of the coolant and preventing overheating and deformation of the large-diameter cutter head 2. The high-density counterweight 8 optimizes the tool's center of gravity distribution, balancing centrifugal force during high-speed rotation and reducing cutting vibration. The wear-resistant coating 9 enhances the wear resistance of the cutting edge, ensuring cutting accuracy and tool life. The reinforcing ribs 5 strengthen the structural rigidity of the tool holder 1 and the large-diameter cutter head 2, preventing component deformation caused by long-term cutting.

Claims

1. A large-diameter double-flute internal bore cutter characterized by, include: The tool holder (1) and the large diameter cutting head (2) are provided. The tool holder (1) has a mounting hole (7) inside. The tool holder (1) has a chip removal groove one (3) inside. The tool holder (1) has a chip removal groove two (4) inside. The large diameter cutting head (2) is located at one end of the tool holder (1) and is used to cut the inner groove hole of the workpiece to be processed. A reinforcing rib (5) is provided at the connection between the large-diameter cutter head (2) and the cutter shank (1) to enhance the connection rigidity; Cooling hole (6) is provided through the tool holder (1), reinforcing rib (5) and large diameter tool head (2) to enhance the heat dissipation of the large diameter tool head (2); A wear-resistant coating (9) is applied to the cutting edge surface of the large diameter cutter head (2) to improve the wear resistance and high temperature resistance of the large diameter cutter head (2); The counterweight assembly is disposed inside the tool holder (1) and is used to balance the centrifugal force when the tool rotates at high speed.

2. The big-diameter double-flute internal hole boring cutter according to claim 1, characterized in that: The counterweight assembly includes a high-density counterweight block (8), which is disposed inside the handle (1).

3. The large-diameter double-chip-row internal slot boring tool according to claim 1, characterized in that: The diameter of the cooling hole (6) is consistent in the tool holder (1), reinforcing rib (5) and large diameter cutting head (2), and the inner wall of the cooling hole (6) is polished.

4. The large-diameter double-chip-row internal slot boring tool according to claim 1, characterized in that: The reinforcing rib (5) is integrally formed at the connection between the large diameter cutter head (2) and the handle (1), and its two ends are respectively fixed to the root of the large diameter cutter head (2) and the end of the handle (1), thereby strengthening the structural rigidity of the connection.

5. The large-diameter double-chip-removal slotted bore boring tool according to claim 2, characterized in that: The high-density counterweight (8) is made of high-density cast iron and is installed in the cavity inside the handle (1) through the mounting hole (7).

6. The large-diameter double-chip-removal slotted bore boring tool according to claim 1, characterized in that: The wear-resistant coating (9) is made of titanium nitride and covers the cutting edge surface of the large-diameter cutter head (2).

7. The large-diameter double-chip-removal slotted bore boring tool according to claim 2, characterized in that: The shape of the high-density counterweight (8) is perfectly matched with the shape of the cavity inside the handle (1), and the outer wall of the high-density counterweight (8) is tightly fitted with the inner wall of the cavity.

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