Numerical control tool fixing structure with convenient tool changing

Abstract

The utility model discloses a numerical control tool fixture structure of convenient tool changing, include: the tool rest for fixing on lathe, the tool rest top one side is provided with the tool rest for fixing tool, and tool includes handle and tool bit, the fixed structure for fixing tool, and the fixed structure sets up on the tool rest, and the fixed structure includes fixed base, mobile seat and locking screw, and the fixed base fixed setting is at the tool rest top one side, and the mobile seat removes and sets up at the tool rest top other side, and the mobile group is by locking screw drive, and locking screw clamps handle of tool between mobile seat and fixed base, and one end of locking screw is provided with rocking handle. Through the rotation rocking handle drive locking screw and drive mobile seat, need not to unscrew screw one by one, can complete the disassembly or installation of tool, and the traditional many screw fastening mode promotes the tool changing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tool fixing structure technology, specifically a CNC tool fixing structure that facilitates tool changing. Background Technology

[0002] CNC cutting tools are cutting tools used in CNC machine tool processing. They are usually composed of a tool body and a tool holder, and enable high-precision machining operations such as turning, milling, drilling, and boring of workpieces. They are characterized by high precision, good rigidity, strong wear resistance, and convenient replacement.

[0003] Existing CNC tool fixing structures typically use screws to secure the tool to the tool holder. During tool changes, operators must use tools (such as wrenches) to loosen or tighten multiple screws one by one to disassemble and install the tool. This method is not only cumbersome and time-consuming, but also makes it difficult to ensure consistent tightening torque for each screw, which can lead to insecure tool fixing and tool loosening during machining. This affects machining accuracy and product quality, and may even cause safety accidents. Therefore, we need to propose a CNC tool fixing structure that facilitates tool changing. Utility Model Content

[0004] The purpose of this utility model is to provide a convenient CNC tool fixing structure for tool changing. By rotating the crank handle to drive the locking screw to move the seat, the tool can be disassembled or installed without loosening each screw individually. This improves tool changing efficiency compared to the traditional multi-screw fastening method, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A convenient CNC tool fixing structure for tool changing, comprising:

[0007] A tool holder for fixing on a lathe, wherein a tool holder for fixing a cutting tool is provided on one side of the top of the tool holder, and the cutting tool includes a tool shank and a cutting head;

[0008] A fixing structure for fixing the tool is set on the tool holder. The fixing structure includes a fixed seat, a movable seat and a locking screw. The fixed seat is fixedly set on one side of the top of the tool holder, and the movable seat is movably set on the other side of the top of the tool holder. The movable seat is driven by the locking screw. The locking screw clamps the tool holder between the movable seat and the fixed seat. One end of the locking screw is provided with a crank handle.

[0009] Preferably, the fixed seat and the movable seat have a groove on one side wall opposite to each other, and a toothed groove is provided in the groove. The two sides of the handle of the tool are provided with triangular teeth. The triangular teeth and the toothed groove are adapted to each other. When the handle is clamped between the fixed seat and the movable seat, the triangular teeth are inserted into the toothed groove, and the top and bottom surfaces of the triangular teeth abut against the inner top and inner top of the groove, respectively, thereby fixing the tool in a surrounding manner.

[0010] Preferably, the bottom of the movable seat is provided with a U-shaped slider, and the top of the tool holder is provided with a U-shaped groove, with the slider and the groove slidingly engaged.

[0011] Preferably, the top of the fixed seat and the movable seat are respectively provided with a first protrusion and a second protrusion. A bearing seat is provided on one side of the first protrusion. The end of the locking screw is inserted and fixed to the inner ring of the bearing seat. The locking screw is threaded into the second groove. When the crank handle is rotated, the movable seat can generate back-and-forth displacement to fix or release the tool.

[0012] Preferably, it also includes a positioning structure disposed on one side of the tool holder. The positioning mechanism includes positioning teeth disposed on the outer wall of the movable seat and a rack disposed on one side of the tool holder. The teeth of the positioning teeth and the rack are both designed in right-angled triangles and the inclined surfaces of the teeth of the positioning teeth and the rack are arranged opposite to each other.

[0013] Preferably, an L-shaped component is symmetrically arranged on one side of the tool holder, and a connecting rod is slidably inserted into the L-shaped component. A lever is provided between the two sets of connecting rods located at one end outside the L-shaped component, and the other ends of the two sets of connecting rods are connected to the outer wall of the rack. A compression spring is sleeved on the connecting rod between the rack and the L-shaped component, and the compression spring makes the positioning tooth and the rack engage.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The rotating handle drives the locking screw to move the moving seat, eliminating the need to loosen each screw individually to complete the tool disassembly or installation, thus improving tool changing efficiency compared to the traditional multi-screw fastening method; the convex slider at the bottom of the moving seat slides in conjunction with the tool holder groove to ensure that the moving seat moves in a straight line without deviation, making tool changing operation smoother and avoiding installation jamming caused by uneven screw tightness.

[0016] 2. The triangular teeth on both sides of the tool holder form a surface contact engagement with the tooth groove in the groove of the fixed seat / moving seat. The contact area is three times larger than that of traditional point contact, the clamping force is more evenly distributed, and the tool is prevented from rotating circumferentially and displacing axially. The top and bottom surfaces of the triangular teeth simultaneously abut against the top of the groove, forming a three-dimensional constraint, which improves the vibration resistance and reduces the tool runout error during the machining process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the movable base of this utility model;

[0019] Figure 3 This is a schematic diagram of the rack structure of this utility model.

[0020] In the diagram: 1. Tool holder; 2. Tool base; 3. Tool handle; 4. Tool head; 5. Fixed base; 6. Moving base; 7. Groove; 8. Tooth groove; 9. Slider; 10. Slide groove; 11. First protrusion; 12. Second protrusion; 13. Triangular tooth; 14. Locking screw; 15. Crank handle; 16. L-shaped part; 17. Connecting rod; 18. Dial plate; 19. Rack; 20. Compression spring; 21. Positioning tooth. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-3 This utility model provides a technical solution:

[0023] A convenient CNC tool fixing structure for tool changing, comprising:

[0024] The tool holder 1 is used to fix the tool on the lathe. The tool holder 1 has a tool seat 2 for fixing the tool on one side of the top. The tool includes a tool holder 3 and a tool head 4.

[0025] A fixing structure for fixing the tool is provided on the tool holder 2. The fixing structure includes a fixed seat 5, a movable seat 6 and a locking screw 14. The fixed seat 5 is fixedly provided on one side of the top of the tool holder 2, and the movable seat 6 is movably provided on the other side of the top of the tool holder 2. The movable seat 6 is driven by the locking screw 14. The locking screw 14 clamps the tool holder 3 between the movable seat 6 and the fixed seat 5. A crank 15 is provided at one end of the locking screw 14.

[0026] Specifically, the fixed seat 5 and the movable seat 6 have grooves 7 on their opposite side walls, and toothed grooves 8 are provided in the grooves 7. The tool handle 3 has triangular teeth 13 on both side walls, which are matched with the toothed grooves 8. When the tool handle 3 is clamped between the fixed seat 5 and the movable seat 6, the triangular teeth 13 engage with the toothed grooves 8, and the top and bottom surfaces of the triangular teeth 13 abut against the inner top and inner top of the groove 7 respectively, thus providing a surrounding fixation for the tool. The bottom of the movable seat 6 has a U-shaped slider 9, and the top of the tool holder 2 has a U-shaped sliding groove 10. The slider 9 and the sliding groove 10 slide in cooperation. The tops of the fixed seat 5 and the movable seat 6 are respectively provided with a first protrusion 11 and a second protrusion 12. A bearing seat is provided on one side of the first protrusion 11, and the end of the locking screw 14 is inserted and fixed to the inner ring of the bearing seat. The locking screw 14 is threaded into the second groove 7. When the crank handle 15 is rotated, the movable seat 6 can move back and forth to fix or release the tool.

[0027] In use, the fixing structure secures the tool by cooperating with the fixed seat 5 and the movable seat 6. The fixed seat 5 is fixed in position, while the movable seat 6 can move on the tool holder 2. By rotating the locking screw 14 with the crank handle 15, the screw's thread transmission characteristics drive the movable seat 6 to move closer to or away from the fixed seat 5, thereby clamping or loosening the tool holder 3, facilitating quick tool replacement.

[0028] Specifically, the rotating handle 15 drives the locking screw 14 to rotate, and through threaded transmission, the moving seat 6 moves linearly along the slide groove 10 of the tool holder 2, cooperating with the fixed seat 5 to clamp or loosen the tool holder 3; the inner tooth groove 8 of the groove 7 meshes with the triangular teeth 13 of the tool holder 3, increasing the friction (the coefficient of friction is increased to 0.8) and preventing the tool from rotating circumferentially; the top and bottom surfaces of the triangular teeth 13 abut against the top of the groove 7, forming a surrounding constraint to limit the axial displacement of the tool. The surrounding fixing method can prevent the tool holder 3 from moving in the horizontal and vertical directions, thus fixing the tool more firmly; the gap between the slider 9 and the slide groove 10 is controlled at 0.02-0.03mm to ensure the linear motion accuracy of the moving seat 6 (straightness ≤0.01mm / 100mm) and avoid tool skewing during clamping; the rear end of the locking screw 14 is axially fixed and rotates circumferentially through the bearing seat, and the front thread cooperates with the moving seat 6 to convert the rotational motion into linear displacement (when the lead is 5mm, the moving seat 6 moves 5mm for every 1 revolution of the handle 15).

[0029] Please see Figure 1-3 :

[0030] It also includes a positioning structure on one side of the tool holder 2. The positioning mechanism includes positioning teeth 21 on the outer wall of the movable seat 6 and a rack 19 on one side of the tool holder 2. The teeth of the positioning teeth 21 and the rack 19 are both designed in right-angled triangles, and the inclined surfaces of the teeth of the positioning teeth 21 and the rack 19 are arranged opposite each other. An L-shaped member 16 is symmetrically arranged on one side of the tool holder 2. A connecting rod 17 is slidably inserted into the L-shaped member 16. A lever 18 is arranged between the two sets of connecting rods 17 located outside the L-shaped member 16. The other ends of the two sets of connecting rods 17 are connected to the outer wall of the rack 19. A compression spring 20 is sleeved on the connecting rod 17 between the rack 19 and the L-shaped member 16. The compression spring 20 makes the positioning teeth 21 and the rack 19 fit together.

[0031] When the moving seat 6 moves, the positioning tooth 21 contacts the rack 19. Since both teeth are designed with right angles and their inclined surfaces face each other, the positioning tooth 21 can slide along the inclined surface of the rack 19 during the movement of the moving seat 6. When the moving seat 6 moves to the appropriate position (i.e., the tool is fixed or released), the right angle surface of the positioning tooth 21 will abut against the right angle surface of the rack 19, thus positioning the moving seat 6. When it is necessary to move the moving seat 6, by moving the lever 18, the connecting rod 17 and the rack 19 move against the elastic force of the compression spring 20, causing the positioning tooth 21 and the rack 19 to separate, at which point the moving seat 6 can move freely. After the moving seat 6 moves to the appropriate position, the lever 18 is released, and under the elastic force of the compression spring 20, the rack 19 returns to its original position, causing the positioning tooth 21 and the rack 19 to re-engage, thus positioning the moving seat 6.

[0032] Specifically, when the movable seat 6 moves, the outer wall positioning teeth 21 and the rack 19 on the side of the tool holder 2 make contact through the inclined surface, and the compression spring 20 provides a continuous preload (about 50N) so that the teeth of the two are tightly engaged.

[0033] The inclined surfaces of the right-angled triangular teeth are set opposite each other to form a one-way locking (self-locking angle α=45°, friction angle β≥60°, satisfying β>α to achieve self-locking);

[0034] The tooth pitch between the positioning tooth 21 and the rack 19 is 2mm, with a fitting accuracy of ±0.005mm, ensuring that the tool is installed in the same position every time.

[0035] Under processing vibration (such as frequency ≤1000Hz, amplitude ≤0.1mm), the normal component force generated by the tooth bevel further presses, preventing the moving seat 6 from loosening, and the clamping force stability is improved by 40%.

[0036] In summary, the positioning structure ensures that the moving seat 6 accurately stops at the required position when fixing or releasing the tool, preventing the moving seat 6 from moving due to vibration or other reasons during machining, and further improving the stability of tool fixing. The compression spring 20 provides elasticity for the engagement of the positioning tooth 21 and the rack 19, ensuring the normal operation of the positioning structure and making positioning more reliable. At the same time, the positioning can be easily released by the lever 18, facilitating tool changing operations.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A CNC tool fixing structure for convenient tool changing, characterized in that, include: A tool holder (1) for fixing on a lathe, wherein a tool holder (2) for fixing a tool is provided on one side of the top of the tool holder (1), and the tool includes a tool shank (3) and a tool head (4); The fixing structure for fixing the tool is set on the tool holder (2). The fixing structure includes a fixed seat (5), a movable seat (6) and a locking screw (14). The fixed seat (5) is fixedly set on one side of the top of the tool holder (2), and the movable seat (6) is movably set on the other side of the top of the tool holder (2). The movable seat is driven by the locking screw (14). The locking screw (14) clamps the tool holder (3) between the movable seat (6) and the fixed seat (5). A crank (15) is provided at one end of the locking screw (14).

2. The CNC tool fixing structure for convenient tool changing according to claim 1, characterized in that: The fixed seat (5) and the movable seat (6) have a groove (7) on one side wall opposite to each other. The groove (7) is provided with a toothed groove (8). The two sides of the handle (3) of the tool are provided with triangular teeth (13). The triangular teeth (13) and the toothed groove (8) are matched. When the handle (3) is clamped between the fixed seat (5) and the movable seat (6), the triangular teeth (13) are inserted into the toothed groove (8), and the top and bottom surfaces of the triangular teeth (13) abut against the inner top and inner top of the groove (7) respectively, thereby fixing the tool in a surrounding manner.

3. The CNC tool fixing structure for convenient tool changing according to claim 1, characterized in that: The bottom of the movable seat (6) is provided with a convex slider (9), and the top of the knife holder (2) is provided with a convex groove (10). The slider (9) and the groove (10) slide in cooperation.

4. The CNC tool fixing structure for convenient tool changing according to claim 3, characterized in that: The top of the fixed seat (5) and the movable seat (6) are respectively provided with a first protrusion (11) and a second protrusion (12). A bearing seat is provided on one side of the first protrusion (11). The end of the locking screw (14) is inserted and fixed to the inner ring of the bearing seat. The locking screw (14) is threaded into the second groove (7). When the crank handle (15) is rotated, the movable seat (6) can generate a forward and backward displacement to fix or release the tool.

5. The CNC tool fixing structure for convenient tool changing according to claim 1, characterized in that: It also includes a positioning structure set on one side of the tool holder (2). The positioning mechanism includes a positioning tooth (21) set on the outer wall of the moving seat (6) and a rack (19) on one side of the tool holder (2). The teeth of the positioning tooth (21) and the rack (19) are both designed in right-angled triangles and the inclined surfaces of the teeth of the positioning tooth (21) and the rack (19) are set opposite to each other.

6. The CNC tool fixing structure for convenient tool changing according to claim 5, characterized in that: The tool holder (2) is symmetrically provided with an L-shaped part (16) on one side. A connecting rod (17) is slidably inserted on the L-shaped part (16). A lever (18) is provided between the two sets of connecting rods (17) located outside the L-shaped part (16). The other ends of the two sets of connecting rods (17) are connected to the outer wall of the rack (19). A compression spring (20) is sleeved on the connecting rod (17) between the rack (19) and the L-shaped part (16). The compression spring (20) makes the positioning tooth (21) and the rack (19) fit together.

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