Cutting tool for groove machining

Abstract

The utility model provides a cutting tool for groove machining, which comprises a transmission shaft and further comprises a tool bar coaxially mounted at the tail end of the transmission shaft through a locking mechanism, and a tool disc is mounted at the tail end of the tool bar. The insertion hole is coaxially formed in the tail end of the transmission shaft, the insertion rod axially extends out of the top end of the cutter bar, the insertion rod can be inserted into the insertion hole to achieve torque transmission, the two sides of the top end of the cutter bar are symmetrically provided with a pair of installation arms, the installation arms axially extend along the side wall of the transmission shaft, and a locking hole perpendicular to the axis is formed in a shaft body of the transmission shaft. The locking pin penetrates through the mounting arm and the locking hole to axially fix the cutter bar; a pair of tool bits is arranged on the two sides of the cutter head, a heat dissipation fin set is arranged on the side face of each tool bit, a pair of air guide holes are formed in the cutter head, the air inlet ends of the air guide holes are arranged behind fins, and the other ends of the air guide holes are parallel to the top face of the cutter head and penetrate through the cutter head to form air outlets. And rapid replacement and continuous high-load heat dissipation support of the cutter are realized.

Description

Technical Field

[0001] This utility model relates to the field of groove machining, and in particular to a cutting tool for groove machining. Background Technology

[0002] Grooving is a common machining method, widely used in the production and manufacturing of various products. As the core tool for grooving, the performance of the cutting tool directly affects the machining efficiency and quality.

[0003] Traditional grooving cutting tools often require multiple sets of bolts or nuts for fastening, which is cumbersome and time-consuming. This not only increases the labor intensity of workers but also reduces production efficiency. Furthermore, during long-term continuous machining, the high-speed friction between the cutting tool and the workpiece generates a large amount of heat, causing the cutting edge temperature to rise. High temperatures not only reduce the hardness and wear resistance of the tool and shorten its service life but also affect machining accuracy and surface quality. To address this, a cutting tool for grooving has been proposed, such as Chinese Patent Application No. CN202421353641.0, which discloses a cutting tool for grooving. This tool includes a drive column with a slot on one side. A mounting plate is located at the bottom of the drive column, and a retaining plate is mounted on one side of the mounting plate, passing through the slot. A vertically movable limiting component is slidably mounted on the surface of the drive column. A cutting tool is mounted on the bottom surface of the retaining plate. The cutting tool includes a tool shank, a tool head, and two cutting edges. The tool shank is welded to the bottom of the mounting plate, the tool head is welded to the lower end of the tool shank, and the cutting edges are welded to one side of the tool head. Multiple heat sinks are welded to the surface of the cutting edges, and two air guide holes are formed on the surface of the tool head. When the cutting tool rotates, air passes through the air guide holes and blows towards the heat sinks, which conduct heat generated by the cutting edges, effectively dissipating heat from the cutting edges.

[0004] However, existing technologies similar to the aforementioned patents have the following problems: the connection structure between the tool and the transmission column has uneven stress, and under high-speed rotation and stress, the connection structure between the tool holder and the transmission column may experience rigid fracture or deformation. Furthermore, the heat dissipation structure of the tool still has room for improvement.

[0005] In summary, a cutting tool for slot machining is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the problems of uneven force distribution and heat dissipation defects in existing cutting tools, this utility model proposes a cutting tool for groove machining, the technical solution of which is as follows.

[0007] A cutting tool for grooving includes a drive shaft and a tool holder coaxially mounted to the end of the drive shaft via a locking mechanism, with a tool disc mounted at the end of the tool holder;

[0008] The locking mechanism includes a coaxial insertion hole at the end of the drive shaft, an axially extending insertion rod at the top of the tool bar, the insertion rod being inserted into the insertion hole to achieve torque transmission, a pair of mounting arms symmetrically arranged on both sides of the top of the tool bar, the mounting arms extending axially along the side wall of the drive shaft, the drive shaft body having a locking hole perpendicular to the axis, and a locking pin passing through the mounting arm and the locking hole to axially fix the tool bar.

[0009] The cutter disc has a pair of cutter heads on both sides, and heat dissipation fins are arranged on the sides of the cutter heads. The cutter disc has a pair of air guide holes. One end of the air guide hole is located behind the fins, and the other end is parallel to the top surface of the cutter disc and passes through the cutter disc to form an air outlet.

[0010] Furthermore, the inner wall of the insertion hole is provided with several keyways parallel to the axis of the insertion hole, and several locking keys are provided on the outer side of the insertion rod. The locking keys can be coaxially inserted into the keyways to fix the tool rod.

[0011] Furthermore, one end of the mounting arm is fixed to the side wall of the tool holder, and the other end extends axially along the side wall of the transmission shaft and has a mounting groove. The locking pin is coaxially inserted into the locking hole along the mounting groove and then inserted into the mounting groove of the opposite mounting arm. Both ends of the locking pin are detachably installed in the mounting groove.

[0012] Furthermore, the cutter head is composed of two semi-cylinders, with the top and bottom surfaces of the two semi-cylinders on the same plane, and the side planes of the two semi-cylinders on the same plane but not completely overlapping. The axial cross-section of the cutter head is a rotationally symmetric figure, with the symmetry point located on the axis of the cutter bar.

[0013] Furthermore, the cutting head is positioned at a point where the side plane of the semi-cylinder does not overlap.

[0014] Furthermore, the cutter head includes a perpendicularly intersecting axial cutting tool and a radial cutting tool, with the axial cutting tool and the longitudinal cutting tool protruding from the side and bottom surfaces of the cutter head, respectively.

[0015] Furthermore, the heat dissipation fin assembly is disposed between the axial cutting tool and the radial cutting tool.

[0016] Furthermore, a filter plate is provided on the windward side of the heat dissipation fin assembly. One end of the filter plate is fixed to the top surface of the cutter head. One end of the air inlet of the air guide hole is located behind the fins, and the other end is parallel to the top surface of the cutter head and passes through the cutter head in an arc to form an air guide hole. The air outlet is directly opposite the heat dissipation fin assembly of the opposite cutter head.

[0017] Furthermore, the heat dissipation fins are corrugated to increase the heat dissipation area.

[0018] Furthermore, the inner wall of the air guide hole is provided with a spiral guide groove.

[0019] This utility model has the following beneficial effects: Through the following technical improvements, it achieves multiple beneficial effects: First, the locking mechanism of the insert rod and keyway, combined with the synergistic effect of the side wall mounting arm and locking pin, effectively improves the concentric assembly accuracy of the drive shaft and tool holder, ensuring both the stability of efficient torque transmission and preventing loosening of the connection due to machining vibration. Second, the combined design of the spiral guide groove and corrugated heat dissipation fins within the air guide hole, combined with the directional airflow effect under centrifugal force, constructs an efficient heat conduction path, achieving rapid heat dissipation from the cutting edge. Simultaneously, the detachable filter plate intercepts cutting debris to maintain unobstructed heat dissipation channels. The overall technical solution balances structural reliability, heat dissipation efficiency, and maintenance convenience, comprehensively improving tool life and machining stability. Attached Figure Description

[0020] Figure 1 This is a side view of the present invention;

[0021] Figure 2 This is a schematic diagram of the mounting groove of this utility model;

[0022] Figure 3 This is a schematic diagram of the filter plate of this utility model;

[0023] Figure 4 This is a schematic diagram of the cutter head of this utility model;

[0024] Figure 5 This is a schematic diagram of the heat dissipation fin assembly of this utility model.

[0025] In the above attached figures: 1. Drive shaft; 2. Tool holder; 3. Insertion hole; 4. Insertion rod; 5. Mounting arm; 6. Locking hole; 7. Locking pin; 8. Tool disc; 9. Tool head; 10. Heat dissipation fin assembly; 11. Air guide hole; 12. Keyway; 13. Locking key; 14. Mounting groove; 15. Axial cutting tool; 16. Radial cutting tool; 17. Filter plate; 18. Guide groove; 19. Air inlet; 20. Air outlet. Detailed Implementation

[0026] The present invention will now be described with reference to the accompanying drawings:

[0027] like Figure 1 As shown, a cutting tool for slot machining includes a drive shaft 1 and a tool holder 2 coaxially mounted at the end of the drive shaft 1 via a locking mechanism. A tool disc 8 is mounted at the end of the tool holder 2.

[0028] like Figure 1 , Figure 2As shown, the locking mechanism includes a hole 3 coaxially opened at the end of the drive shaft 1, a rod 4 extending axially from the top of the tool bar 2, the rod 4 being inserted into the hole 3 to achieve torque transmission, a pair of mounting arms 5 symmetrically arranged on both sides of the top of the tool bar 2, the mounting arms 5 extending axially along the side wall of the drive shaft 1, the shaft body of the drive shaft 1 having a locking hole 6 perpendicular to the axis, and a locking pin 7 passing through the mounting arm 5 and the locking hole 6 to axially fix the tool bar 2;

[0029] like Figure 1 , Figure 4 As shown, a pair of blades 9 are provided on both sides of the blade disc 8, and heat dissipation fins 10 are provided on the side of the blades 9. The blade disc 8 has a pair of air guide holes 11. One end of the air inlet 19 of the air guide hole 11 is located behind the fins, and the other end is parallel to the top surface of the blade disc 8 and passes through the blade disc 8 to form an air outlet 20.

[0030] like Figure 1 , Figure 3 As shown, preferably, the inner wall of the insertion hole 3 is provided with several keyways 12 parallel to the axis of the insertion hole 3, and the outer side of the insertion rod 4 is provided with several locking keys 13. The locking keys 13 can be coaxially inserted into the keyways 12 to fix the tool bar 2. Through the matching of the keyways 12 and the locking keys 13, the relative rotation between the insertion rod 4 and the insertion hole 3 of the transmission shaft 1 caused by torque transmission is effectively prevented, ensuring the coaxial stability of the tool bar 2 and the transmission shaft 1 and reducing transmission energy loss.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, preferably, one end of the mounting arm 5 is fixed to the side wall of the tool holder 2, and the other end extends axially along the side wall of the drive shaft 1, and has a mounting groove 14. The locking pin 7 is coaxially inserted into the locking hole 6 along the groove of the mounting groove 14 and then into the mounting groove 14 of the opposite mounting arm 5. Both ends of the locking pin 7 are fixed in the mounting groove 14 by high-strength bolts. Care should be taken during use. The locking pin 7 passes through the mounting groove 14 of the mounting arm 5 and the locking hole 6 of the drive shaft 1, forming a multi-point contact constraint, which can axially fix the position of the tool holder 2, avoiding axial displacement caused by machining vibration, while retaining the convenience of quick disassembly.

[0032] like Figure 1 , Figure 4 As shown, preferably, the cutter head 8 is composed of two semi-cylinders, and the top and bottom surfaces of the two semi-cylinders are on the same plane, and the side planes of the two semi-cylinders are on the same plane but do not completely overlap. The axial section of the cutter head 8 is a rotationally symmetric figure, and the symmetry point is located on the axis of the tool holder 2. The symmetrically distributed semi-cylinder structure makes the force on the cutter head 8 balanced when it rotates. The rotational symmetry design of the axial section offsets the centrifugal force deviation during the cutting process and reduces the overall vibration of the tool.

[0033] likeFigure 1 , Figure 4 As shown, preferably, the cutter head 9 is located at the non-overlapping area of ​​the semi-cylinder side plane. By utilizing the non-overlapping area of ​​the side plane to arrange the cutter head 9, the cutting part of the tool can be accommodated, while avoiding excessive interference between the cutting edge and the cutter head 8 body, thus reducing the risk of thermal stress concentration.

[0034] like Figure 1 As shown, preferably, the cutter head 9 includes a perpendicularly intersecting axial cutting blade 15 and a radial cutting blade 16, and the axial cutting blade 15 and the longitudinal cutting blade protrude from the side and bottom surfaces of the cutter head 8, respectively.

[0035] like Figure 1 As shown, preferably, the heat dissipation fin group 10 is disposed between the axial cutting tool 15 and the radial cutting tool 16. The heat dissipation fins are disposed in the maximum heat source area at the junction of the cutting edges, which can quickly dissipate cutting heat by utilizing the internal heat conduction path of the cutting head 9, and prevent local high temperature from softening the material of the cutting head 9.

[0036] like Figure 1 , Figure 3 , Figure 4 As shown, preferably, the heat dissipation fin assembly 10 is provided with a filter plate 17 on its windward side. One end of the filter plate 17 is fixed to the top surface of the cutter head 8 by bolts. The bolts need to be checked for looseness each time they are used. One end of the air inlet 19 of the air guide hole 11 is located behind the fins, and the other end is parallel to the top surface of the cutter head 8 and passes through the cutter head 8 in an arc to form the air guide hole 11. The air outlet 20 is directly opposite the heat dissipation fin assembly 10 of the opposite cutter head 9. The air guide hole 11 is designed to use the centrifugal force generated by the rotation of the cutter to form a forced airflow. The airflow carries away heat through the surface of the heat dissipation fins. The filter plate 17 can intercept large particles of chips and prevent the air guide hole 11 from being blocked.

[0037] like Figure 5 As shown, preferably, the heat dissipation fins are corrugated to increase the heat dissipation area. The corrugated surface increases the surface area of ​​the heat dissipation fins, expands the contact area with the airflow, improves the heat convection efficiency, and optimizes the airflow disturbance to enhance the local heat exchange performance.

[0038] like Figure 4 As shown, preferably, the inner wall of the air guide hole 11 is provided with a spiral guide groove 18, which uses the Coanda effect to accelerate the introduction of air into the air guide hole 11, prolong the residence time of the airflow in the channel, and enhance the heat dissipation effect.

[0039] When using this tool, first insert the insert rod 4 at the top of the tool holder 2 into the insertion hole 3 of the drive shaft 1, and ensure torque transmission through the keyway 12 and locking key 13. Then, pass the locking pin 7 through the mounting groove 14 of the mounting arm 5 and the locking hole 6 of the drive shaft 1 to complete axial fixation. During the rotation of the tool disc 8, the orthogonal cutting edge achieves synchronous machining of the side wall and bottom surface of the groove. At the same time, the air guide hole 11 uses centrifugal force to drive airflow through the heat dissipation fin assembly 10, and the spiral guide groove 18 further accelerates the airflow circulation and discharges waste chips. The removable filter plate 17 prevents chips from entering the air guide hole 11, and regular disassembly and cleaning can maintain heat dissipation efficiency. This structure, through the synergistic effect of force balance design, directional heat dissipation and modular locking mechanism, takes into account machining accuracy, service life and maintenance convenience.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cutting tool for slot machining, characterized in that: It includes a drive shaft (1) and a tool bar (2) coaxially mounted at the end of the drive shaft (1) via a locking mechanism. A tool disc (8) is mounted at the end of the tool bar (2). The locking mechanism includes a insertion hole (3) coaxially opened at the end of the drive shaft (1), an insertion rod (4) extending axially from the top of the tool bar (2), the insertion rod (4) can be inserted into the insertion hole (3) to realize torque transmission, a pair of mounting arms (5) symmetrically arranged on both sides of the top of the tool bar (2), the mounting arms (5) extending axially along the side wall of the drive shaft (1), the shaft body of the drive shaft (1) is provided with a locking hole (6) perpendicular to the axis, and a locking pin (7) passes through the mounting arm (5) and the locking hole (6) to fix the tool bar (2) axially; The cutter disc (8) is provided with a pair of cutter heads (9) on both sides, and heat dissipation fins (10) are provided on the side of the cutter heads (9). The cutter disc (8) is provided with a pair of air guide holes (11). One end of the air inlet (19) of the air guide hole (11) is located behind the fins, and the other end is parallel to the top surface of the cutter disc (8) and passes through the cutter disc (8) to form an air outlet (20).

2. The cutting tool for grooving according to claim 1, characterized in that: The inner wall of the insertion hole (3) is provided with several keyways (12) parallel to the axis of the insertion hole (3), and several locking keys (13) are provided on the outer side of the insertion rod (4). The locking keys (13) can be coaxially inserted into the keyways (12) to fix the tool bar (2).

3. The cutting tool for grooving according to claim 1, characterized in that: One end of the mounting arm (5) is fixed to the side wall of the tool bar (2), and the other end extends axially along the side wall of the transmission shaft (1) and is provided with a mounting groove (14). The locking pin (7) is inserted coaxially into the locking hole (6) along the groove of the mounting groove (14) and then into the mounting groove (14) of the opposite mounting arm (5). Both ends of the locking pin (7) are detachably installed in the mounting groove (14).

4. The cutting tool for grooving according to claim 1, characterized in that: The cutter head (8) is composed of two semi-cylinders, and the top and bottom surfaces of the two semi-cylinders are on the same plane, and the side planes of the two semi-cylinders are on the same plane but do not completely overlap. The axial section of the cutter head (8) is a rotationally symmetric figure, and the symmetry point is located on the axis of the cutter bar (2).

5. The cutting tool for grooving according to claim 4, characterized in that: The cutter head (9) is positioned at a point where the side plane of the semi-cylinder does not overlap.

6. The cutting tool for grooving according to claim 5, characterized in that: The cutter head (9) includes a perpendicularly intersecting axial cutting cutter (15) and a radial cutting cutter (16), with the axial cutting cutter (15) and the longitudinal cutting cutter protruding from the side and bottom of the cutter head (8), respectively.

7. The cutting tool for grooving according to claim 6, characterized in that: The heat dissipation fin assembly (10) is disposed between the axial cutting tool (15) and the radial cutting tool (16).

8. The cutting tool for grooving according to claim 7, characterized in that: The heat dissipation fin assembly (10) has a filter plate (17) on its windward side. One end of the filter plate (17) is fixed to the top surface of the cutter disc (8). One end of the air inlet (19) of the air guide hole (11) is located behind the fins, and the other end is parallel to the top surface of the cutter disc (8) and passes through the cutter disc (8) in an arc to form the air guide hole (11). The air outlet (20) is directly opposite the heat dissipation fin assembly (10) of the opposite cutter head (9).

9. The cutting tool for grooving according to claim 8, characterized in that: The heat dissipation fins are corrugated to increase the heat dissipation area.

10. The cutting tool for grooving according to claim 1, characterized in that: The inner wall of the air guide hole (11) is provided with a spiral guide groove (18).

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