A tct cutter body and a milling cutter holder

Abstract

The application provides a TCT cutter body and a milling cutter fixing frame, and relates to the technical field of TCT cutters.The TCT cutter body comprises a locking assembly, a pressure increasing assembly and a centrifugal assembly.The locking assembly realizes axial pre-fixing and radial locking of the cutter through cooperation of an inner sleeve, an inclined groove, an inclined block, an extending block and a pull sleeve.The pressure increasing assembly amplifies force through a lever mechanism composed of a magnetic rod, a pull rod, a rolling sleeve, a rolling ball and a fixing block.The centrifugal assembly collects and transmits rotational centrifugal force through a counterweight block, a push sleeve, a guide rod and a synchronous rod.In work, only pre-tightening force facilitating assembly and disassembly is generated in static state.In high-speed rotation, the centrifugal force drives the counterweight block to move outward, and through the lever amplification principle, the pre-tightening force is converted into a huge axial tension on the pull sleeve, and then through the inclined surface mechanism, the huge axial tension is converted into a powerful radial locking force acting on the cutter handle, so that the locking force is self-adaptively enhanced with the rotating speed, and the technical problem of contradiction between dynamic locking deficiency and assembly and disassembly convenience of the traditional fixing mode is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of TCT tool technology, and more specifically, to a TCT tool body and a milling tool holder. Background Technology

[0002] In existing technologies, the connection and fixing methods between the TCT (carbide-coated metal) tool body and the milling tool holder typically employ mechanical structures such as spring collets, side-locking tool holders, or simple locking nuts. These structures rely on the operator manually applying a pre-set static locking force while the machine tool is stationary. For applications like woodworking, where cutting forces are relatively small but tool change frequency is critical, this design, while meeting the basic requirements of "easy replacement" and "no need for excessive fixing force" to some extent, operates entirely based on static presets and cannot respond to dynamic conditions during machining. When the spindle drives the tool to rotate at high speed for cutting, the system generates significant centrifugal force. Existing fixing methods do not incorporate any mechanism to sense, adapt to, or utilize this dynamic load; the clamping force remains constant before and after rotation. This means that at the moment when stability is most needed during machining, the fixing system fails to receive any physical reinforcement. This theoretically weakens the tool's ability to resist radial runout and micro-vibrations during high-speed rotation, constituting a potential technical weakness.

[0003] This technical limitation can lead to a dual problem in practical applications: decreased surface finish and reduced operational efficiency. Because the fixing force cannot dynamically increase with rotational speed, the tool may experience slight radial drift due to vibration during high-speed milling of wood, resulting in surface chatter marks or dimensional deviations, affecting surface smoothness and precision. Furthermore, to avoid potential loosening, operators often apply a greater locking force than actually needed when static, which increases the difficulty and time required for tool loading and unloading, violating the principle of quick tool changes required in woodworking. In addition, failing to utilize centrifugal force wastes a usable physical effect for optimizing fixing performance, making it difficult for existing equipment to achieve an optimal balance between dynamic stability and operational convenience, limiting its application potential in high-efficiency, highly flexible woodworking machining centers. Therefore, developing a tool fixing technology that cleverly utilizes rotational centrifugal force to achieve dynamic self-tightening while maintaining ease of loading and unloading is of great significance for improving the overall efficiency and user experience of woodworking milling. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a TCT tool body and a milling tool holder to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a milling tool holder, comprising a locking assembly, a pressurizing assembly, and a centrifugal assembly; The locking component uses double locking from the top and bottom to create a self-locking mechanism in the vertical direction to fix the tool in place. It can effectively fix the tool regardless of the amount of vertical pressure applied, thus ensuring the fixation effect. The pressurization component amplifies the centrifugal force many times over, causing it to act on the locking component, generating a fixing force not only in the vertical direction but also in the circumferential direction, thus ensuring the continuity of milling. As the cutter rotates, the centrifugal assembly converts centrifugal force into a fixing force many times over. Therefore, the rotation generates a large fixing force, ensuring the fixing effect.

[0006] Preferably, the locking assembly includes an inner sleeve installed on the machine tool, the inner wall of which has two sets of inclined grooves symmetrically arranged along the circumference, each set of inclined grooves having an inclined block slidably connected therein, and each inclined block having an extension block arranged outward from the outer circumference.

[0007] Preferably, the outer wall of the inner sleeve is provided with a plurality of through slots at equal intervals corresponding to the protruding blocks, the protruding blocks are slidably connected in the through slots, the upper and lower sets of protruding blocks are respectively slidably connected in the two pull sleeves, and the two pull sleeves are respectively slidably connected to the outer wall of the inner sleeve.

[0008] Preferably, the pressurization component includes embedded grooves equally spaced along the circumference in the two pull sleeves, and magnetic rods are respectively rotatably connected to the embedded grooves, with the magnetic rods and the pull sleeves generating magnetic attraction.

[0009] Preferably, each magnetic rod is provided with a pull rod at the other end, and multiple pull rods pass through the pull sleeves respectively. The two sets of pull rods are symmetrically arranged. The outer wall of the inner sleeve is fitted with a push spring, and the two ends of the push spring abut against the two pull sleeves respectively.

[0010] Preferably, the outer wall of the inner sleeve is provided with multiple sets of symmetrically arranged fixing blocks at equal intervals, and each pull rod has two roller sleeves rotatably arranged at the end away from the magnetic rod, with the roller sleeves fitting against the fixing blocks, and the two ends of the pull rod are respectively provided with rolling balls.

[0011] Preferably, the centrifugal assembly includes two sets of counterweights respectively attached to the outer wall of the inner sleeve, each counterweight having a push sleeve and a ball attached to the push sleeve, the outer wall of the inner sleeve having multiple sets of guide rods at equal intervals, each counterweight having a guide hole, the guide hole being slidably connected to the guide rod, and the upper and lower ends of the inner sleeve being fixedly provided with limit plates, which restrict the movement of the push sleeve.

[0012] Preferably, each counterweight is provided with a synchronization sleeve on both sides, and a synchronization rod is fixedly provided in each pair of coaxial synchronization sleeves. The two synchronization rods will synchronize the movement trajectory of the two counterweights.

[0013] A TCT cutting tool includes a cutting head and a shank, the cutting head and the shank being coaxially arranged, and the shank being inserted into the inner sleeve.

[0014] Preferably, a clamping sleeve is provided on the side of the plurality of inclined blocks near the axis, and two sets of symmetrically arranged clamping sleeves are respectively attached to the side wall of the tool holder.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a TCT tool body and a milling tool holder, which have the following advantages: This invention creatively transforms centrifugal force into a power source that enhances tool locking force, achieving a fundamental improvement in locking performance from static preset to dynamic adaptation. It directly senses and collects rotational kinetic energy through the radial displacement of the counterweight in the centrifugal assembly at high speed, and then amplifies the force through a unique lever mechanism in the pressurization assembly. Finally, it is converted into a huge radial clamping force through the inclined structure of the locking assembly, thereby enabling the tool to obtain a clamping force far exceeding the static force under the working conditions where stable locking is most needed in high-speed cutting. This solves the inherent defect of traditional clamping mechanisms that cannot adaptively enhance locking force during dynamic processes.

[0016] This invention achieves powerful dynamic locking while perfectly balancing ease of loading and unloading. When the spindle is stationary or at low speed, the clamping sleeve is pre-tightened on the tool holder by the restoring force provided by the push spring. At this time, the locking force is small, and the operator can easily load, align and remove the tool, which greatly facilitates the work process that requires frequent tool changes, such as wood processing. Once the spindle rotates at high speed, the locking force automatically and significantly increases with the increase of speed, without any additional operation or control, achieving an intelligent adaptive effect of "loose at low speed and tight at high speed".

[0017] This invention achieves force sensing, conversion, and amplification through a purely mechanical structure. The entire device is compact, reliable, and requires no external energy or complex control system. Its centrifugal, pressurizing, and locking components are functionally linked through a sophisticated mechanical linkage. All power sources are generated by the rotation of the self-axis itself, avoiding the increased costs, structural complexity, and maintenance difficulties brought about by the introduction of hydraulic, pneumatic, or electric systems. It is particularly suitable for integration and promotion on various CNC machine tools and machining centers.

[0018] The locking force of this invention is positively correlated with the rotation speed, which provides a natural advantage for high-speed and high-precision machining. The higher the rotation speed, the greater the centrifugal force generated, and the stronger the radial locking force applied to the tool holder after amplification and conversion. This perfectly matches the higher requirements for clamping rigidity imposed by the increased cutting force and intensified vibration during high-speed milling, thereby significantly improving the stability, surface quality and dimensional accuracy of the machining process. It is especially suitable for processing fields such as wood and composite materials where high cutting speed and surface finish are required.

[0019] This invention has excellent reliability and long service life. All its transmission and load-bearing components adopt rigid mechanical connections and contacts. Key moving pairs, such as the roller sleeve and the fixed block, use rolling friction, resulting in minimal wear. Furthermore, the structure avoids the risk of failure of electronic sensors or sealing elements in harsh processing environments. The entire device can work stably for a long time in working conditions filled with sawdust and dust, effectively reducing maintenance frequency and operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a TCT tool body and a milling tool holder according to the present invention; Figure 2 This is a cross-sectional view of the limiting disk in this invention; Figure 3 This is a cross-sectional view of the counterweight block in this invention. Figure 4 This is a cross-sectional view of the inner sleeve in this invention; Figure 5 This is a schematic diagram of the structure of the tie rod and the roller sleeve in this invention; Figure 6 This is a schematic diagram of the structure of the inner sleeve and counterweight in this invention; Figure 7 This is a cross-sectional view of the inner sleeve in this invention.

[0021] In the diagram: 11. Locking assembly; 12. Inner sleeve; 13. Inclined groove; 14. Inclined block; 15. Extending block; 16. Through groove; 17. Pull sleeve; 21. Pressure boosting assembly; 22. Embedded groove; 23. Magnetic rod; 24. Pull rod; 25. Push spring; 26. Fixing block; 27. Roller sleeve; 28. Rolling ball; 31. Centrifugal assembly; 32. Counterweight block; 33. Push sleeve; 34. Guide rod; 35. Guide hole; 36. Limiting plate; 37. Synchronizing sleeve; 38. Synchronizing rod; 41. Cutting head; 42. Cutting handle; 43. Clamping sleeve. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0025] Please see Figures 1 to 7 This embodiment provides a fixing bracket designed to solve the technical problem that traditional tool clamping mechanisms cannot further enhance the dynamic locking effect by utilizing the centrifugal force generated during high-speed rotation after statically preset clamping force. Through a unique mechanical structure, the rotational centrifugal force is sensed, amplified, and converted into radial clamping force, achieving adaptive fixing that is "easy to load and unload statically and powerfully locks in dynamically". It is particularly suitable for occasions such as wood processing that require frequent tool changes and pursue high-efficiency processing.

[0026] 1. Overall structure and initial state The mounting bracket mainly includes a locking assembly 11 fixedly installed on the machine tool spindle system, a pressurizing assembly 21 linked with the locking assembly 11, and a centrifugal assembly 31 that rotates with the spindle. The matching TCT tool includes a cutting head 41 for cutting and a tool holder 42 for clamping. The tool holder 42 is partially inserted into the center hole of the locking assembly 11 of the mounting bracket to complete the installation.

[0027] 2. Composition of the core fixed system The core fixing system is integrated inside the fixing frame and mainly consists of a locking unit and a power conversion and amplification unit working together.

[0028] 2.1 Locking Unit The locking unit is used to achieve bidirectional self-locking fixation of the tool in the axial direction and is the part that directly performs the clamping function.

[0029] The unit includes a fixed inner sleeve 12, whose inner wall has two sets of inclined grooves 13 symmetrically arranged along the circumference. Each set of inclined grooves 13 contains a slidingly fitted inclined block 14, and each inclined block 14 has a protruding block 15 fixedly connected to its outer side. The outer wall of the inner sleeve 12 has multiple axially extending through grooves 16, and each protruding block 15 passes through and is confined within a corresponding through groove 16, allowing it to slide along the through groove 16. Two pull sleeves 17 are slidably fitted onto the upper and lower parts of the outer wall of the inner sleeve 12, respectively, with the inner wall of each pull sleeve 17 forming a limited sliding connection with a corresponding set of protruding blocks 15. A clamping sleeve 43 is installed on the side of each inclined block 14 near the axis, for directly contacting and clamping the tool holder 42.

[0030] 2.2 Power Conversion and Amplification Unit This unit is used to collect, amplify, and transmit the rotational centrifugal force to the locking unit, and is the core of achieving adaptive locking.

[0031] It includes a centrifugal force collection section and a force amplification and transmission section. The centrifugal force collection section mainly consists of two sets of symmetrically arranged counterweights 32. The counterweights 32 are slidably fitted onto multiple guide rods 34 fixed to the outer wall of the inner sleeve 12 through guide holes 35, thus limiting their movement to radial. Each counterweight 32 is provided with a push sleeve 33, and limit plates 36 are fixed at the upper and lower ends of the inner sleeve 12 to limit the ultimate displacement of the counterweights 32. The two sides of the counterweights 32 are connected by synchronous sleeves 37 and synchronous rods 38 to ensure that the upper and lower counterweights 32 can move radially synchronously.

[0032] The force amplification and transmission section includes multiple lever mechanisms. Two pull sleeves 17 have equally spaced recessed grooves 22 along their circumference. Each groove 22 contains a magnetic rod 23 connected to it via magnetic attraction. Each magnetic rod 23 is connected to a pull rod 24, which extends out of the pull sleeve 17. Multiple fixing blocks 26 are correspondingly provided on the outer wall of the inner sleeve 12. Two rolling sleeves 27 are rotatably mounted on the end of each pull rod 24 away from the magnetic rod 23, and a ball bearing 28 is also provided at that end. The rolling sleeves 27 roll against the surface of the corresponding fixing block 26, while the ball bearing 28 is in contact with the surface of the push sleeve 33 on the counterweight block 32. A push spring 25 is fitted onto the outer wall of the inner sleeve 12, with its two ends abutting against the upper and lower pull sleeves 17 respectively.

[0033] 3. Working process and fixing principle of the device The working process of the fixing frame and the fixing principle based on this process are as follows: S1: Tool installation and pre-fixation.

[0034] The operator manually pinches the upper and lower pull sleeves 17 inwards, overcoming the elasticity of the push spring 25 to bring them closer together. The pull sleeves 17, through the connected protruding block 15, drive the two sets of inclined blocks 14 to slide along the inclined groove 13 of the inner sleeve 12, causing all the clamping sleeves 43 to converge towards the center and slightly expand, thus creating sufficient space in the center of the inner sleeve 12. At this time, the shank 42 of the TCT tool is inserted axially until it reaches the preset position. Releasing the pull sleeves 17, under the reset action of the push spring 25, the two pull sleeves 17 move in opposite directions a short distance, causing the inclined blocks 14 to move slightly, making the clamping sleeves 43 slightly adhere to the side wall of the shank 42, achieving pre-fixation of the tool. In this state, the clamping force is small, facilitating manual operation and tool adjustment.

[0035] S2: High-speed rotation and dynamic locking force generation.

[0036] The spindle starts, driving the fixed frame and the pre-fixed tool to rotate at high speed. At this time, the power conversion and amplification unit starts to work. Under the action of strong centrifugal force, the large counterweight 32 overcomes the initial constraint and slides synchronously along the guide rod 34 in the outer diameter direction. The outwardly moving counterweight 32 applies the centrifugal force as a thrust to the rolling ball 28 that is in contact with it through the push sleeve 33 on it.

[0037] S3: Locking force amplification and transmission.

[0038] The thrust acting on the ball 28 pushes the end of the pull rod 24. Since the sleeve 27 at this end is rolled and supported on the fixed block 26, the pull rod 24 will generate a small lever swing with this contact point as the fulcrum. The magnetic rod 23 at the other end of the pull rod 24 is limited in the inner groove 22 of the pull sleeve 17, serving as the endpoint of the force. The large centrifugal force acting on the ball 28 is amplified at the magnetic rod 23, transforming into a huge axial pulling force on the pull sleeve 17.

[0039] S4: Final powerful locking.

[0040] Under the amplified pulling force, the upper and lower pull sleeves 17 are strongly pulled axially. The pull sleeves 17, through their mating extension blocks 15, transmit this enormous axial pulling force to the wedge block 14. Constrained by the inclined groove 13, the wedge block 14 converts the axial pulling force into a powerful radial compressive force perpendicular to the inclined plane. This compressive force is applied evenly from both the upper and lower directions to the entire mating section of the tool holder 42 via the clamping sleeves 43 on the wedge block 14, thus achieving a comprehensive, dynamic, and powerful locking mechanism. The higher the rotational speed, the greater the centrifugal force generated, and the stronger the resulting radial locking force.

[0041] Working Principle Summary: The core of this invention's fixing bracket lies in its innovative use of centrifugal force as a power source. Through two conversions and amplifications via the counterweight 32, lever mechanism, and inclined plane mechanism, the centrifugal force is transformed into a radial locking force on the cutting tool. This design achieves a positive correlation between the locking force and the rotational speed, providing moderate clamping force for easy operation at rest or low speeds, and providing ultra-strong locking force to ensure stability during high-speed cutting, perfectly balancing ease of assembly and disassembly with machining reliability.

[0042] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. 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 variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A milling tool holder, characterized in that: It includes a locking assembly (11), a pressurizing assembly (21), and a centrifugal assembly (31). The locking component (11) locks the tool in the vertical direction by double locking from the top and bottom, and it will be effectively fixed no matter how much pressure is applied in the vertical direction, thus ensuring the fixing effect. The pressurization component (21) amplifies the centrifugal force many times over, causing it to act on the locking component (11), so that it generates a fixing force not only in the vertical direction but also in the circumferential direction, ensuring the continuity of milling. The centrifugal assembly (31) converts centrifugal force into a fixing force multiple times as the tool rotates. Therefore, it generates a large fixing force as it rotates, ensuring the fixing effect. The locking assembly (11) includes an inner sleeve (12) installed on the machine tool. The inner wall of the inner sleeve (12) is symmetrically provided with two sets of inclined grooves (13) along the circumference. Each set of inclined grooves (13) is slidably connected with an inclined block (14). Each inclined block (14) is provided with an extension block (15) on the outer circumference. The outer wall of the inner sleeve (12) is provided with multiple through grooves (16) at equal intervals corresponding to the extension blocks (15). The extension blocks (15) are limited and slidably connected to the through grooves (16). 16) Inside, the upper and lower sets of protruding blocks (15) are respectively limited and slidably connected to the two pull sleeves (17), and the two pull sleeves (17) are respectively slidably connected to the outer wall of the inner sleeve (12). The pressurizing component (21) includes an embedded groove (22) opened at equal intervals along the circumference in the two pull sleeves (17). A magnetic rod (23) is respectively limited and rotatably connected in the multiple embedded grooves (22). The magnetic rod (23) and the pull sleeve (17) generate magnetic attraction. A pull rod (24) is provided at the other end of each magnetic rod (23), and multiple pull rods (24) pass through the pull sleeve (17) respectively. The two sets of pull rods (24) are respectively symmetrically arranged. The outer wall of the inner sleeve (12) is fitted with a push spring (25), the two ends of which abut against two pull sleeves (17). The outer wall of the inner sleeve (12) is provided with multiple sets of symmetrically arranged fixing blocks (26) at equal intervals. Each pull rod (24) has two roller sleeves (27) rotatably arranged at the end away from the magnetic rod (23), and the roller sleeves (27) are attached to the fixing blocks (26). The two ends of the pull rod (24) are respectively provided with balls (28). The centrifugal assembly (31) includes two sets of counterweights (32) respectively attached to the outer wall of the inner sleeve (12). Each counterweight (32) is provided with a push sleeve (33), and the balls (28) are attached to the outer wall of the inner sleeve (12). On the push sleeve (33), multiple sets of guide rods (34) are provided at equal intervals on the outer wall of the inner sleeve (12). Each counterweight (32) is provided with a guide hole (35). The guide hole (35) is slidably connected to the guide rod (34). Limiting discs (36) are fixedly provided at the upper and lower ends of the inner sleeve (12). The movement position of the push sleeve (33) is restricted by the limiting discs (36). Synchronizing sleeves (37) are provided on both sides of each counterweight (32). Synchronizing rods (38) are fixedly provided in each pair of coaxially arranged synchronous sleeves (37). The movement trajectory of the two counterweights (32) is synchronized by the two synchronous rods (38).

2. A TCT tool body, employing a milling tool holder according to claim 1, characterized in that: It includes a cutting head (41) and a cutting handle (42), which are coaxially arranged, and the cutting handle (42) is inserted into the inner sleeve (12).

3. The TCT tool body according to claim 2, characterized in that: A clamping sleeve (43) is provided on the side of the multiple inclined blocks (14) near the axis, and two sets of symmetrically arranged clamping sleeves (43) are respectively attached to the side wall of the tool holder (42).

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