Numerical control turning tool with tool bit convenient to replace

Abstract

The utility model discloses a numerical control turning tool with a tool bit convenient to replace, and relates to the technical field of numerical control turning tools. The device further comprises a first limiting assembly, rotation of the double-end tool rest can be limited through longitudinal movement of the first limiting assembly, and meanwhile sliding between the tool handle and the supporting sleeve can be limited. A limiting sleeve is slidably arranged on the supporting sleeve in the length direction of the supporting sleeve, longitudinal movement of the first limiting assembly can be limited through sliding of the limiting sleeve, the position of the double-end tool rest is temporarily limited by embedding a trapezoidal limiting table into a limiting storage hole, excessive rotation is prevented, and then the tool rest limiting block is completely embedded into the limiting storage hole of the double-end tool rest; the tool bit of the turning tool can be rapidly replaced by matching with the limiting of the two limiting pins, the machining precision of the replaced tool bit of the turning tool is ensured, and the problems that after the tool bit of an existing tool is damaged, a standby tool needs to be found again and installed in a screw turning mode, and time is consumed during partial emergency machining are solved.

Description

Technical Field

[0001] This utility model relates to the field of CNC turning tool technology, specifically a CNC turning tool with an easy-to-change tool head. Background Technology

[0002] CNC turning tools are key tools used for cutting workpieces in CNC machine tool machining. They consist of a tool body, tool holder, and inserts, and are used to achieve automated machining through precise installation and programming control. The inserts are mostly made of high-performance materials such as cemented carbide, ceramics, and cubic boron nitride. Coatings can be selected according to the material being machined (such as steel, cast iron, and non-ferrous metals) to improve wear resistance and lifespan. Structurally, they are classified as integral, welded, and indexable inserts. Indexable inserts are fixed with screws and can be quickly replaced after wear, improving efficiency. Based on their application, they can be divided into external turning tools, internal turning tools, threading tools, etc., suitable for different machining processes.

[0003] For example, utility model patent CN221312533U discloses a CNC tool fixing mechanism, including a base, a fixing seat on the top of the base, fixing bolts near the corners of the fixing seat, an installation groove near the front of the top of the base, a fixing block inside the installation groove, a tool groove near the front of the top of the fixing block, a blade inside the tool groove, sliders on both sides of the fixing block, sliding grooves on the inner sidewall of the installation groove for each corresponding slider, springs inside several spring grooves, and an electromagnet at the center of the top of the base. Compared with existing CNC tool fixing mechanisms, the tool can be replaced without completely loosening the clamping bolts, improving the convenience and practicality of tool replacement in CNC tool fixing mechanisms.

[0004] However, the electromagnetic clamping force used in this type of tool is in the same direction as the force that generates vibration during machining, and it lacks a limiting structure, which causes the tool head to wobble during machining, affecting machining accuracy. Furthermore, after the tool head is damaged, a replacement tool needs to be found and installed by tightening screws, which takes a long time in some emergency machining operations. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a CNC turning tool with an easily replaceable cutting head. It solves the problems of existing devices where the electromagnetic clamping force is in the same direction as the force generating vibration during machining, and the lack of a limiting structure causes the cutting head to wobble during machining, affecting machining accuracy. Furthermore, when the cutting head is damaged, a replacement tool needs to be found and installed by screwing, which is time-consuming in some urgent machining operations. This invention resolves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a CNC turning tool with easily replaceable tool heads, comprising a tool holder, one end of which has a rotating groove, and a double-headed tool post rotatably connected to the end of the rotating groove via a fixed rotating shaft, both ends of which are fixedly mounted with turning tool heads, and a support sleeve slidably connected to the outside of the tool holder; it also includes a first limiting component, which restricts the rotation of the double-headed tool post by longitudinal movement, and also restricts the sliding between the tool holder and the support sleeve; a limiting sleeve is slidably provided on the support sleeve along its length, and the sliding of the limiting sleeve restricts the longitudinal movement of the first limiting component.

[0007] Preferably, the first limiting component includes a tool holder limiting block and a pressure plate. The tool holder limiting block is fixedly connected to the bottom of the pressure plate. The double-headed tool holder has two limiting and receiving holes. The tool handle has a tool holder limiting hole that communicates with the rotating groove. The tool holder limiting block can be inserted into both the tool holder limiting hole and the limiting and receiving hole at the same time. A limiting pin is fixedly provided at the bottom of the pressure plate. The support sleeve has a positioning hole that matches the limiting pin.

[0008] Preferably, a guide sleeve is connected to the positioning hole by an interference fit, and the limiting pin can be inserted into the guide sleeve.

[0009] Preferably, spring fixing holes are provided on both sides of the positioning hole, and a return spring is installed in the spring fixing hole. Spring limiting holes are provided on both sides of the bottom of the pressure plate located at the limiting pin, and the top end of the return spring can be inserted into the spring limiting hole.

[0010] Preferably, the bottom of the rotating groove is provided with a limiting groove that is vertically corresponding to the tool holder limiting hole. A guide plate is slidably arranged in the limiting groove along the longitudinal direction. A trapezoidal limiting platform is fixedly installed on the guide plate. The trapezoidal limiting platform can be inserted into the bottom of the limiting storage hole. A spring pad for pushing the trapezoidal limiting platform to move upward is provided in the limiting groove.

[0011] Preferably, a pair of dovetail sliders are fixedly provided on the support sleeve, and a dovetail groove matching the pair of dovetail sliders is fixedly provided on the limiting sleeve; an electromagnetic fixing hole is provided on the support sleeve, an electromagnet is fixedly provided in the electromagnetic fixing hole, and a guide step hole is provided at the bottom of the limiting sleeve, and a magnetic limiting block is installed in the guide step hole through a retraction spring.

[0012] Preferably, the support sleeve has a sliding groove, and the tool holder has an auxiliary slider that slides within the sliding groove.

[0013] Preferably, the electromagnet is positioned below the upper wall of the support sleeve within the electromagnetic fixing hole. When the return spring retracts, the magnetic limiting block is positioned above the lower wall of the limiting sleeve. Activating the electromagnet causes it to magnetically attract the magnetic limiting block, overcoming the spring force of the return spring and pulling it into the electromagnetic fixing hole (half of the magnetic limiting block is located in the guide step hole, and half in the electromagnetic fixing hole), thus achieving rigid locking between the limiting sleeve and the support sleeve and preventing displacement of the limiting sleeve due to processing vibration.

[0014] This utility model provides a CNC turning tool with an easy-to-change cutting head, which has the following advantages:

[0015] A trapezoidal limiting platform is inserted into the limiting storage hole to temporarily restrict the position of the double-headed tool post and prevent excessive rotation. Then, the tool post limiting block is fully inserted into the limiting storage hole of the double-headed tool post, and with the limiting of two limiting pins, the tool head can be quickly changed, and the machining accuracy of the tool head is ensured. This solves the problem that when the tool head is damaged, a spare tool needs to be found and installed by screwing, which is time-consuming in some emergency machining.

[0016] Rapid unlocking is achieved through electromagnetic control and spring reset, and multiple guide structures ensure a smooth replacement process. Spare tool heads can be switched without disassembling the tool head. A dovetail slider and electromagnet provide axial and radial dual constraints, ensuring that the cutting tool head is stable and does not wobble during machining. This solves the problem that existing tools use electromagnetic clamping force that is in the same direction as the force that generates vibration during machining, and lack a limiting structure, which causes the tool head to wobble during machining and affects machining accuracy. Attached Figure Description

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

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

[0019] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the support sleeve structure in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the first limiting component in this utility model;

[0022] Figure 6 This is a schematic diagram of the limiting sleeve in this utility model;

[0023] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0024] Figure 8 This is a cross-sectional schematic diagram of the trapezoidal limiting platform in this utility model.

[0025] In the diagram: 1. Tool holder; 2. Fixed pivot; 3. Double-headed tool post; 4. Lathe tool head; 5. Rotary groove; 6. Limiting groove; 7. Tool post limiting hole; 8. Tool post limiting block; 9. Support sleeve; 10. Electromagnetic fixing hole; 11. Electromagnet; 12. Limiting sleeve; 13. Guide step hole; 14. Retraction spring; 15. Magnetic limiting block; 16. Spring pad; 17. Guide plate; 18. Trapezoidal limiting platform; 19. Pressure plate; 20. Limiting pin; 21. Spring limiting hole; 22. Positioning hole; 23. Guide sleeve; 24. Spring fixing hole; 25. Slide groove; 26. Auxiliary slider; 27. Dovetail slider; 28. Dovetail groove; 29. ​​Return spring; 30. Limiting storage hole. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] Please see Figures 1-8 A CNC turning tool with easy-to-change tool head includes a tool holder 1, one end of which has a rotating groove 5. A double-headed tool holder 3 is rotatably connected to the end of the rotating groove 5 via a fixed rotating shaft 2. Both ends of the double-headed tool holder 3 are fixedly mounted with turning tool heads 4. A support sleeve 9 is slidably connected to the outside of the tool holder 1. The tool holder 1 also includes a first limiting component, which can limit the rotation of the double-headed tool holder 3 by moving longitudinally and also limit the sliding between the tool holder 1 and the support sleeve 9. A limiting sleeve 12 is slidably provided on the support sleeve 9 along its length direction, and the sliding of the limiting sleeve 12 can limit the longitudinal movement of the first limiting component.

[0028] Please see Figures 2-3 and Figure 5 The first limiting component includes a tool holder limiting block 8 and a pressure plate 19. The tool holder limiting block 8 is fixedly connected to the bottom of the pressure plate 19. The double-headed tool holder 3 has two limiting storage holes 30. The tool handle 1 has a tool holder limiting hole 7 that communicates with the rotating groove 5. The tool holder limiting block 8 can be inserted into both the tool holder limiting hole 7 and the limiting storage hole 30 at the same time. The bottom of the pressure plate 19 is fixedly provided with a limiting pin 20. The support sleeve 9 has a positioning hole 22 that matches the limiting pin 20.

[0029] Please see Figure 2 A guide sleeve 23 is connected inside the positioning hole 22 by an interference fit, and the limiting pin 20 can be inserted into the guide sleeve 23.

[0030] Please see Figure 4Spring fixing holes 24 are provided on both sides of the positioning hole 22. A reset spring 29 is installed in the spring fixing hole 24. Spring limiting holes 21 are provided on both sides of the bottom of the pressure plate 19, which is located at the limit pin 20. The top of the reset spring 29 can be inserted into the spring limiting hole 21.

[0031] Please see Figure 3 and Figure 8 The bottom of the rotating groove 5 is provided with a limiting groove 6 that is vertically corresponding to the tool holder limiting hole 7. A guide plate 17 is slidably arranged in the limiting groove 6 along the longitudinal direction. A trapezoidal limiting platform 18 is fixedly installed on the guide plate 17. The trapezoidal limiting platform 18 can be inserted into the bottom of the limiting storage hole 30. A spring pad 16 is provided in the limiting groove 6 to push the trapezoidal limiting platform 18 to move upward.

[0032] Please see Figure 7 A pair of dovetail sliders 27 are fixedly installed on the support sleeve 9, and a dovetail groove 28 matching the pair of dovetail sliders 27 is fixedly installed on the limiting sleeve 12; an electromagnetic fixing hole 10 is opened on the support sleeve 9, and an electromagnet 11 is fixedly installed in the electromagnetic fixing hole 10; a guide step hole 13 is opened at the bottom of the limiting sleeve 12, and a magnetic limit block 15 is installed in the guide step hole 13 through a retraction spring 14.

[0033] Please see Figure 2 The support sleeve 9 has a groove 25 inside, and the tool holder 1 has an auxiliary slider 26 that slides in the groove 25.

[0034] In Example 1, the trapezoidal limiting platform 18 is embedded in the limiting storage hole 30 to temporarily restrict the position of the double-headed tool holder 3 and prevent excessive rotation. Then, the tool holder limiting block 8 is fully embedded in the limiting storage hole 30 of the double-headed tool holder 3. With the limiting of the two limiting pins 20, the machining accuracy of the changing tool head 4 is ensured after the tool head 4 is changed.

[0035] Specifically, first, the operator turns off the electromagnet 11, causing its magnetism to disappear. The retraction spring 14 in the guide stepped hole 13 releases its elasticity, causing the magnetic limit block 15 to exit from the electromagnetic fixing hole 10 and retract completely into the guide stepped hole 13 (at this time, the position of the magnetic limit block is higher than the lower wall of the limit sleeve 12). Then, the limit sleeve 12 is slid along the dovetail slider 27 on the support sleeve 9 (the dovetail groove 28 and the dovetail slider 27 cooperate to ensure accurate sliding trajectory) until the limit sleeve 12 is completely disengaged from the pressure plate 19, releasing the lateral constraint on the second limit structure. After the limit sleeve 12 is disengaged, the return spring 29 in the spring fixing hole 24 on the support sleeve 9 elastically resets, pushing the pressure plate 19 upward (the pressure plate 19 can be pressed down with the other hand to prevent it from being pushed away by the elastic force). The pressure plate 19 drives the tool holder limiting block 8 to move upward along the tool holder limiting hole 7. The two limiting pins 20 on its lower wall slide along the guide sleeve 23 to ensure smooth and uninterrupted movement. Finally, the tool holder limiting block 8 completely disengages from the limiting storage hole 30 of the double-headed tool holder 3, releasing the longitudinal fixation of the double-headed tool holder. Finally, the double-headed tool holder 3 is held, and the tool handle 1 is driven forward along the slide groove 25 of the support sleeve 9 via the fixed rotating shaft 2 (the auxiliary slider 26 slides along the slide groove to limit the direction of movement) until the rotating groove 5 is fully exposed. At this time, the double-headed tool holder 3 rotates around the fixed rotating shaft 2 in the rotating groove 5, causing the spare turning tool head 4 to turn to the machining position. During rotation, the trapezoidal limiting platform 18 of the first limiting structure moves with the rotation of the double-headed tool holder: when the trapezoidal limiting platform 18 disengages from the original limiting storage hole 30, the trapezoidal limiting platform 18 drives the guide plate 17 to press the spring pad 16 along the limiting groove 6 until the trapezoidal limiting platform 18 is flush with the lower wall of the rotating groove 5. When the trapezoidal limiting platform 18 completely disengages from the original limiting storage hole 30, the compressed spring pad 16 drives the trapezoidal limiting platform 18 to reset. When the trapezoidal limiting platform 18 enters the new limiting storage hole 30, the trapezoidal limiting platform 18 repeats the above process, and finally pushes the guide plate 17 to drive the trapezoidal limiting platform 18 to embed into the new limiting storage hole 30, temporarily limiting the position of the double-headed tool holder 3 and preventing excessive rotation.

[0036] Example 2: In this example, rapid unlocking is achieved through electromagnetic control and spring reset. Multiple guide structures ensure a smooth replacement process. The spare tool head can be switched without disassembling the tool head. The dovetail slider 27 and electromagnet 11 provide axial and radial dual constraints to ensure that the cutting tool head is stable and does not wobble during machining.

[0037] Specifically, after replacing the spare cutting tool head 4, the following steps are performed to complete the fixing: First, press down on the pressure plate 19 to compress the return spring 29, causing the tool holder limit block 8 to move downward along the tool holder limit hole 7. The two limit pins 20 are reinserted into the guide sleeve 23 (the guide sleeve 23 ensures that the limit pins are accurately aligned) until the tool holder limit block 8 is fully embedded in the limit storage hole 30 of the double-headed tool holder 3. At this time, the spring limit hole 21 on the lower wall of the pressure plate 19 is aligned with the spring fixing hole 24 of the support sleeve 9, and the return spring 29 is in a compressed and stored state, providing continuous elastic force for the pressure plate 19. Then, slide the limit sleeve 12 in the opposite direction along the dovetail slider 27 to cover the pressure plate 19 again. When the limiting sleeve 12 is pressed against the side wall of the pressure plate 19, the electromagnetic fixing hole 10 is aligned with the guide step hole 13. The electromagnet 11 is activated, which generates magnetic attraction to the magnetic limiting block 15, overcoming the elastic force of the return spring 14 and pulling it into the electromagnetic fixing hole 10 (half of the magnetic limiting block is located in the guide step hole and half in the electromagnetic fixing hole), thus achieving rigid locking between the limiting sleeve and the support sleeve and preventing the limiting sleeve from shifting due to processing vibration.

[0038] 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC turning tool with an easily replaceable tool head, comprising a tool holder (1), characterized in that, The tool holder (1) has a rotating groove (5) at one end. The end of the rotating groove (5) is rotatably connected to a double-headed tool holder (3) via a fixed rotating shaft (2). Both ends of the double-headed tool holder (3) are fixedly installed with lathe tool heads (4). A support sleeve (9) is slidably connected to the outside of the tool holder (1). It also includes a first limiting component, which can restrict the rotation of the double-headed tool holder (3) by moving longitudinally, and can also restrict the sliding between the tool handle (1) and the support sleeve (9); A limiting sleeve (12) is slidably provided on the support sleeve (9) along its length direction. The sliding of the limiting sleeve (12) can restrict the longitudinal movement of the first limiting component.

2. The CNC turning tool with an easily replaceable cutting head according to claim 1, characterized in that, The first limiting component includes a tool holder limiting block (8) and a pressure plate (19). The tool holder limiting block (8) is fixedly connected to the bottom of the pressure plate (19). The double-headed tool holder (3) has two limiting storage holes (30). The tool handle (1) has a tool holder limiting hole (7) that communicates with the rotating groove (5). The tool holder limiting block (8) can be inserted into both the tool holder limiting hole (7) and the limiting storage hole (30) at the same time. The bottom of the pressure plate (19) is fixedly provided with a limiting pin (20). The support sleeve (9) has a positioning hole (22) that matches the limiting pin (20).

3. A CNC turning tool with an easily replaceable cutting head according to claim 2, characterized in that, A guide sleeve (23) is connected to the positioning hole (22) by an interference fit, and the limiting pin (20) can be inserted into the guide sleeve (23).

4. A CNC turning tool with an easily replaceable tool head according to any one of claims 2 or 3, characterized in that, Spring fixing holes (24) are provided on both sides of the positioning hole (22). A reset spring (29) is installed in the spring fixing hole (24). The bottom of the pressure plate (19) is provided with spring limiting holes (21) on both sides of the limiting pin (20). The top end of the reset spring (29) can be inserted into the spring limiting hole (21).

5. A CNC turning tool with an easily replaceable cutting head according to claim 2, characterized in that, The bottom of the rotating groove (5) is provided with a limiting groove (6) that is vertically corresponding to the tool holder limiting hole (7). A guide plate (17) is slidably arranged in the limiting groove (6) along the longitudinal direction. A trapezoidal limiting platform (18) is fixedly installed on the guide plate (17). The trapezoidal limiting platform (18) can be inserted into the bottom of the limiting storage hole (30). A spring pad (16) is provided in the limiting groove (6) for pushing the trapezoidal limiting platform (18) to move upward.

6. A CNC turning tool with an easily replaceable tool head according to claim 1, characterized in that, A pair of dovetail sliders (27) are fixedly provided on the support sleeve (9), and a dovetail groove (28) matching the pair of dovetail sliders (27) is fixedly provided on the limiting sleeve (12); an electromagnetic fixing hole (10) is provided on the support sleeve (9), an electromagnet (11) is fixedly provided in the electromagnetic fixing hole (10), a guide step hole (13) is provided at the bottom of the limiting sleeve (12), and a magnetic limit block (15) is installed in the guide step hole (13) through a retraction spring (14).

7. A CNC turning tool with an easily replaceable tool head according to claim 1, characterized in that, The support sleeve (9) has a groove (25) inside, and the tool holder (1) is fixedly provided with an auxiliary slider (26) that slides in the groove (25).

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