Double-damping vibration-reducing inner hole cutter bar

Abstract

The utility model discloses a double damping vibration reduction inner hole cutter bar, including the pole body, the pole body is equipped with the cavity, the pole body first end is equipped with the cutter head seat of installation cutter head, the pole body inside is equipped with the accommodation cavity of intercommunication cavity, install first damping assembly in the accommodation cavity, first damping assembly first end passes through the central hole of accommodation cavity and is connected the cutter head seat, still install second damping assembly in the accommodation cavity, second damping assembly surrounds the periphery of first damping assembly, and the both ends of second damping assembly respectively resist the cutter head seat and pole body inner wall, and the vibration of cutter head seat is synchronously absorbed by second damping assembly for cooperation first damping assembly, to improve the diameter of cutter bar itself in the limited state, and the wall thickness of cutter bar is often further compressed, and the cutter bar can only use the problem of precious metal manufacture to guarantee the damping effect.

Description

Technical Field

[0001] This utility model relates to deep hole machining tools, specifically to a double-damped vibration-reducing inner hole tool holder. Background Technology

[0002] Metal cutting technology is divided into external and internal cutting. In internal cutting, products often have a large depth-to-diameter ratio in their design holes, so internal cutting tool holders are designed. The main function of internal cutting tool holders is to feed the cutting head into the internal hole for cutting. In early internal cutting tool holders, due to the lack of effective vibration damping measures, the tool holders often generated large vibrations during cutting, which easily accelerated the wear of the cutting head. In some cases, when the rigidity of ordinary tool holders was insufficient, vibration or even tool breakage may occur, which greatly affected the surface finish and machining accuracy, resulting in products that did not meet the design requirements.

[0003] Currently, to improve machining accuracy and workpiece surface smoothness, vibration damping elements are used in internal bore tool holders. These elements reduce vibrations generated during cutting, thereby improving machining accuracy and surface finish. As the depth of cut increases, the tool holder needs to be designed with a larger overhang ratio to meet the cutting requirements of internal bore tool holders.

[0004] In practical applications, increasing the overhang ratio of tool holders leads to both higher replacement costs and increased vibration risks. Currently, vibration risk is primarily controlled by improving material quality or increasing the tool holder's cross-section. Simply put, a higher overhang ratio necessitates a larger diameter tool holder and a more substantial damping system. Furthermore, if the tool holder's diameter is finite, installing damping systems often further compresses the wall thickness. To ensure rigidity, this often necessitates the use of precious metals, resulting in persistently high overall manufacturing costs for internal bore tool holders. Therefore, optimizing the structure of internal bore tool holders for cases with large overhang ratios, while maintaining a constant tool holder diameter and increasing the overhang ratio to a certain extent, to improve vibration reduction efficiency and reduce manufacturing costs, is a worthwhile area of ​​research. Utility Model Content

[0005] The purpose of this utility model is to provide a double-damped vibration-damping inner hole tool holder, in order to improve the problem that the diameter of the tool holder itself is limited, and the installation of damping vibration reduction often further compresses the wall thickness of the tool holder. In order to ensure the vibration reduction effect, the tool holder can often only be made of precious metals.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a double-damped vibration-reducing inner hole tool bar, comprising a rod body, a cavity inside the rod body, a tool head seat for mounting a tool head at the first end of the rod body, and a receiving cavity communicating with the cavity inside the rod body. A first vibration damping component is installed in the receiving cavity, and the first end of the first vibration damping component passes through the receiving cavity and connects to the central hole of the tool head seat. A second vibration damping component is also installed in the receiving cavity, and the second vibration damping component surrounds the first vibration damping component. The two ends of the second vibration damping component respectively abut against the tool head seat and the inner wall of the rod body. The second vibration damping component is used to work in conjunction with the first vibration damping component to synchronously absorb the vibration of the tool head seat.

[0007] Preferably, the second vibration damping component includes an oscillating wave absorber and a fluororubber ring. The fluororubber ring is placed at both ends of the oscillating wave absorber and wraps around the surface of the oscillating wave absorber. The fluororubber ring is sleeved on the outer wall of the first vibration damping component, and the fluororubber rings at both ends of the oscillating wave absorber act as buffer dampers, respectively abutting against the cutter head seat and the inner wall of the receiving cavity.

[0008] A further technical solution is that the above-mentioned oscillating wave absorbing element is provided with protrusions at both ends, and the above-mentioned fluororubber ring is provided with grooves for the protrusions to be inserted into, and the above-mentioned fluororubber ring is fixed on the oscillating wave absorbing element through the grooves.

[0009] Preferably, the aforementioned receiving cavity includes a first receiving area and a second receiving area, the aforementioned second vibration damping component is installed in the first receiving area, and the two ends of the aforementioned second receiving area are respectively connected to the first receiving area and the cavity; and the end of the first vibration damping component extends into the second receiving area.

[0010] A further technical solution is that the outer wall of the first vibration damping component is provided with a first sealing groove, and a damping ring is fitted on the first sealing groove. The first damping ring is located in the second receiving area and abuts against the inner wall of the second receiving area.

[0011] A further technical solution is that a second sealing groove is provided inside the central hole of the aforementioned cutter head seat, and a second damping ring is fitted on the second sealing groove, with the second damping ring abutting against the outer wall of the first damping component in the first accommodating area.

[0012] Preferably, the cutter head holder is provided with a group of holes, which includes three or more mounting holes. The mounting holes of the group of holes are all arranged around the central hole of the cutter head holder. The mounting holes are used to correspond to the screw holes on the cutter head. The cutter head is fixed to the cutter head holder by bolts through the mounting holes.

[0013] A further technical solution is that the aforementioned cutter head holder has two or more sets of holes; and the mounting holes of two adjacent sets of holes are spaced apart, with each set of holes corresponding to a type of cutter head.

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

[0015] This invention primarily builds upon existing tool holders by directly connecting a first vibration damping component to the center hole of the tool head holder. This first component absorbs axial and core area vibrations. A second vibration damping component surrounds the first component, filling the cavity between the tool head holder and the first component. The second component's ends abut against the inner walls of the tool head holder and the tool holder, thus buffering vibrations in the radial and peripheral areas. This dual-damping structure, formed by the first and second components, provides more comprehensive damping compared to a single damping structure, reducing the risk of tool vibration and chipping.

[0016] The second vibration damping component of this invention uses a fluororubber ring as a buffer damper and weakens low-frequency, high-amplitude vibrations through an oscillation wave absorber. The housing cavity is configured as a first and second receiving area, thus achieving a dual-layout structure of the first and second vibration damping components without increasing the diameter of the original rod body. Through this dual-damping design, under the same processing conditions, there is no need to excessively reduce the rod wall thickness. Furthermore, the first damping ring abuts against the inner wall, and the second damping ring abuts against the outer wall of the first vibration damping component in the first receiving area, thereby providing auxiliary damping to the first vibration damping component in the radial direction, reducing its sway space, and further enhancing structural stability. Attached Figure Description

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

[0018] Figure 2 This is a schematic diagram of the installation of the vibration damping component of this utility model.

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

[0020] Figure 4 This is a schematic diagram showing the distribution of mounting holes on the cutter head holder.

[0021] Figure 5 This is a schematic diagram of a cutter head structure in an embodiment of this utility model.

[0022] Figure 6 This is a schematic diagram of another cutter head structure in an embodiment of this utility model.

[0023] Figure 7 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] One embodiment of this utility model is, with reference to Figures 1 to 3 As shown, a dual-damping vibration-damping internal tool holder includes a rod body 1 with a cavity 2 inside. The rod body 1 has a tool holder 3 at its head end for mounting the tool head. The rod body 1 is a tool holder made of existing materials. Because the rod body 1 itself has a cavity 2, the space available for placing the vibration damper inside is limited due to the limited size of the rod body 1. The vibration damper inside the rod body 1 is mainly used as an oscillating wave absorbing element. In principle, the higher the density of the vibration damper, the better. Common materials for vibration dampers inside the rod body 1 are high-density metals such as tungsten, gold, platinum, and osmium, which results in excessively high costs.

[0026] To reduce costs, the aforementioned rod body 1 also includes a receiving cavity 4 that connects to the hollow cavity 2. A first vibration damping component 5 is installed in the receiving cavity 4, with its head end passing through the central hole of the cutter head seat 3. The receiving cavity 4 is a further excavated space based on the hollow cavity 2. The area of ​​the receiving cavity 4 typically reduces the inner wall thickness of the rod body 1. Therefore, by having the first vibration damping component 5 penetrate the entire receiving cavity 4, the hollow area within the rod body 1 is reduced, thereby increasing the rigidity of the rod body 1. Ideally, the first vibration damping component 5 should be made of a high-density metal; however, in this embodiment, due to cost considerations, a lead alloy can also be used.

[0027] The side of the aforementioned receiving cavity 4 closest to the cutter head seat 3 is the beginning end, and the side of the receiving cavity 4 furthest from the cutter head seat 3 is the end end. The size of the beginning end of the receiving cavity 4 is larger than that of the end end. Considering that the performance of lead alloys is generally lower than that of high-density metals such as tungsten, gold, platinum, and osmium, a double-damping structure is adopted. That is, a second vibration damping component 6 is also installed in the aforementioned receiving cavity 4. The second vibration damping component 6 is installed at the beginning end of the receiving cavity 4 and surrounds the first vibration damping component 5. The two ends of the second vibration damping component 6 respectively abut against the inner wall of the cutter head seat 3 and the rod body 1. The second vibration damping component 6 is used to work in conjunction with the first vibration damping component 5 to synchronously absorb the vibration of the cutter head seat 3.

[0028] The second vibration damping component 6 includes an existing oscillation wave absorber, which can be made of existing lead alloy. The second vibration damping component 6 can effectively absorb the vibration generated during the cutting of the tool bar. This dual-damping structure is, in principle, better than the single-damping structure, and can meet the vibration control requirements of more working conditions to a great extent. In addition, the entire damping tool bar has a simple structure and uses less precious metal, which is conducive to achieving economical manufacturing and widespread application.

[0029] For reference, traditional vibration damping tools generally achieve vibration reduction by increasing the stiffness of the rod 1 during the design process. Essentially, this is achieved by optimizing the stiffness under static conditions, using the increased stiffness to raise the natural frequency of the resonance phenomenon of the rod 1, thereby enhancing the rod 1's resistance to deformation, and thus reducing the amplitude and frequency of vibration caused by external forces, thereby achieving the purpose of vibration reduction. During processing, since the force on the cutting head is usually periodic or pulsed, the process of transmitting the load to the rod 1 is also generally periodic. Therefore, the dynamic stiffness of the rod 1 directly determines the vibration resistance of the cutting head in the working state. That is, while maintaining the static stiffness of the structure, optimization also needs to optimize the dynamic stiffness. The first vibration damping component 5 and the second vibration damping component 6 are mainly used to optimize the dynamic stiffness generated by the rod 1. The first vibration damping component 5 passes through the receiving cavity 4, and the second vibration damping component 6 is sleeved on the first vibration damping component 5, so that the first vibration damping component 5 and the second vibration damping component 6 are both located close to the cutting head. Thus, when the first vibration damping component 5 and the second vibration damping component 6 are used together, they can directly generate a complementary relationship, thereby increasing the oscillation frequency near the cutting head.

[0030] Based on the dynamic stiffness, increasing the viscous damping coefficient of the first damping component 5 and the second damping component 6 is also beneficial to the structural stability of the rod 1. When the first damping component 5 and the second damping component 6 are transmitting loads, some damping structures can be set so that during the load transmission process, especially when the structure is subjected to external forces or instantaneous loads, some mechanical energy can be absorbed and dissipated through the damping structures, thereby reducing the accumulation of energy during the transmission process and weakening vibration.

[0031] The first damping component 5 and the second damping component 6 are complementary in position to respond to different vibration frequencies and directions. Under the action of periodic cutting force, the cutter head D transmits the load to the cutter head holder 3, and the load of the cutter head holder 3 is transmitted to the first damping component 5 and the second damping component 6 respectively. This ensures that the mechanical energy generated by the cutter head D is transferred to the first damping component 5 and the second damping component 6 after passing through the cutter head holder 3. Specifically, the energy transmission at the center of the cutter head holder 3 is mainly due to low-frequency vibrations caused by axial or longitudinal forces. This energy is directly transmitted to the first damping component 5 and absorbed by it, allowing the first damping component 5 to suppress resonance and large deformation of the main modes. The edge area around the cutter head holder 3 is more susceptible to radial force, torque and high-frequency disturbances during machining. Therefore, when some of the energy transmitted around the cutter head holder 3 is given to the second damping component 6, the second damping component 6 is mainly used to receive high-frequency and complex modal vibrations. This part of the vibration needs to be absorbed by the second damping component 6 first, and the remaining energy is then dissipated by entering the first damping component 5 through the second damping component 6, forming multiple damping absorptions, thereby reducing continuous vibration.

[0032] refer to Figure 2 and Figure 7 As shown, based on the above embodiments, another embodiment of this utility model is that the second vibration damping component 6 includes an oscillation wave absorber 601 and a fluororubber ring 602. The fluororubber ring 602 is placed at both ends of the oscillation wave absorber 601 and wraps around the surface of the oscillation wave absorber 601. The fluororubber ring 602 itself is elastic and can buffer and transmit vibrations at both ends of the oscillation wave absorber 601. At the same time, the oscillation wave absorber 601 can absorb low-frequency, high-amplitude vibrations. The oscillation wave absorber 601 and the fluororubber ring 602 form the second vibration damping component 6, so that contact with the second vibration damping component 6 can provide absorption for vibrations of different frequencies. The fluororubber ring 602 is sleeved on the outer wall of the first vibration damping component 5, and the fluororubber rings 602 at both ends of the oscillation wave absorber 601 act as buffer dampers, respectively abutting against the inner wall of the cutter head seat 3 and the receiving cavity 4. The second vibration damping component 6 is wrapped around the first vibration damping component 5, and a fluororubber ring 602 is sleeved on the outer wall of the first vibration damping component 5. The fluororubber ring 602 is installed in a circumferential manner, which is beneficial for the fluororubber ring 602 to absorb and transmit vibrations in the radial and axial directions.

[0033] It should be noted that the fluororubber ring 602 will deform during operation due to vibration transmission. Utilizing the elasticity of the fluororubber ring 602 itself, its elastic deformation process directly absorbs some of the vibration energy, especially high-frequency small-amplitude vibrations. At the same time, it transmits the unabsorbed vibrations to the oscillation wave absorber 601. The oscillation wave absorber 601 is an existing product, mainly used to specifically weaken low-frequency large-amplitude oscillation waves. With the fluororubber ring 602 located on both sides of the oscillation wave absorber 601, the vibration waves transmitted through the fluororubber ring 602 are transmitted to the oscillation wave absorber 601, which specifically absorbs very low-frequency large-amplitude vibrations, thereby ensuring the absorption capacity of the second vibration damping component for frequency vibrations and improving the overall vibration damping effect of the tool holder.

[0034] Further reference Figure 2 As shown, the aforementioned oscillating wave absorber 601 is provided with protrusions 603 at both ends, and the aforementioned fluororubber ring 602 is provided with grooves 604 for the protrusions 603 to be inserted into. The fluororubber ring 602 is fixed to the oscillating wave absorber 601 through the grooves 604. The protrusions 603 and grooves 604 are in a fitted relationship, which mainly allows the fluororubber ring 602 to effectively wrap around both ends of the oscillating wave absorber 601, ensuring that the rubber ring 602 is not easily slipped or detached from the oscillating wave absorber 601 under long-term vibration. At the same time, when the protrusions 603 and grooves 604 cooperate with each other, they also ensure that the fluororubber ring 602 is always in the correct position around both ends of the oscillating wave absorber, ensuring contact with the cutter head seat 3 and the inner wall of the receiving cavity 4, achieving stable absorption and transmission of axial and radial vibrations.

[0035] The oscillation wave absorber 601 is made of lead alloy, which objectively reduces the reliance on high-rigidity precious metals and reduces material costs. The high specific gravity of lead alloy in the oscillation wave absorber 601 is beneficial for absorbing vibration energy, especially low-frequency, large-amplitude vibrations, while the fluororubber ring 602 itself has a good dissipation and buffering effect on high-frequency, small-amplitude vibrations. It should also be noted that the elasticity of the fluororubber ring 602, which wraps around the lead alloy surface, not only transmits and buffers the axial and radial oscillation waves generated by the buffer tool holder, but also reduces the vibration of the tool holder. The protrusions 603 and grooves 604 generally adopt trapezoidal or other interlocking structures to prevent false contact caused by loose contact, ensuring the efficiency of damping and vibration reduction.

[0036] Based on the above embodiments, refer to Figure 1 Another embodiment of the present invention is shown, wherein the aforementioned receiving cavity 4 includes a first receiving area 401 and a second receiving area 402, the aforementioned second vibration damping component 6 is installed in the first receiving area 401, and the two ends of the aforementioned second receiving area 402 are respectively connected to the first receiving area 401 and the cavity 2; and the end of the first vibration damping component 5 extends into the second receiving area 402. The inner diameter of the first receiving area 401 is larger than that of the second receiving area 402, and the second receiving area 402 is mainly used to install the first vibration damping component 5 and ensure that the first vibration damping component 5 has a certain length.

[0037] The length of the first vibration damping component 5 is greater than that of the second vibration damping component 6, and the inner diameter of the second vibration damping component 6 is greater than that of the first vibration damping component 5. Since the second vibration damping component 6 is sleeved on the first vibration damping component 5, its first accommodating area 401 is the effective space for filling in the inner cavity of the rod 1.

[0038] It should be noted that, considering that the cavity 2 of the rod body 1 is generally used to input cutting fluid during actual operation, the axis of the first damping component 5 is provided with a through hole. The two ends of the through hole are respectively connected to the central hole of the cavity 2 and the tool holder 3 for the output of cutting fluid.

[0039] Further reference Figure 1 and Figure 2 As shown, to improve the sealing performance of cavity 2 and ensure stable output of cutting fluid, the outer wall of the first damping component 5 is provided with a first sealing groove 501, and a first damping ring 502 is sleeved on the first sealing groove 501. The first damping ring 502 is located in the second accommodating area 402 and abuts against the inner wall of the second accommodating area 402.

[0040] The first damping ring 502 is located on the outer wall of the first vibration damping component 5. Besides providing a relatively airtight barrier, the first damping ring 502 also forms an elastic frictional contact with the cavity 2 to absorb small-amplitude high-frequency vibrations transmitted through this area and eliminate resonance in the rod 1. Multiple first sealing grooves 501 are present. These multiple first sealing grooves 501 and the first damping ring 502 improve the dissipation of local vibrations and optimize sealing.

[0041] Furthermore, considering the output of cutting fluid to the center hole of the tool holder 3, in order to ensure that the cutting fluid flows directly to the tool head D, a second sealing groove 301 is provided inside the center hole of the tool holder 3. A second damping ring 302 is fitted on the second sealing groove 301, and the second damping ring 302 abuts against the outer wall of the first damping component 5 in the first receiving area 401.

[0042] The second sealing groove 301 is installed inside the center hole of the tool head seat. The second damping ring 302 has a similar function to the first damping ring 502. The second damping ring 302 is installed inside the center hole of the tool head seat and abuts against the outer wall of the first damping component 5. On the one hand, the second damping ring 302 can prevent the cutting fluid from entering the receiving cavity 4 along with the outer wall of the first damping component. On the other hand, the second damping ring 302 can strengthen the elastic connection between the tool head seat and the first damping component. The second damping ring 302 provides flexible support, further isolating and attenuating the impact energy and high-frequency micro-vibration transmitted from the tool head seat inward.

[0043] Based on the above embodiments, refer to Figure 3 and Figure 7 As shown, another embodiment of this utility model is that the cutter head holder 3 is provided with a group of holes, including three or more mounting holes 7, all of which are arranged around the central hole of the cutter head holder 3; the mounting holes 7 are used to correspond to the screw holes on the cutter head D; the cutter head is fixed to the cutter head holder 3 by bolts through the mounting holes 7. For reference, the cutter head can be connected to the cutter head holder 3 using a Torx screw, and the Torx screw's conical surface is used for positioning and locking to prevent the cutter head D from loosening on the cutter head holder 3. This method of mounting the cutter head through the cutter head holder 3 facilitates the replacement of different models of cutter heads to meet different processing requirements.

[0044] Further reference Figure 4 As shown, to facilitate compatibility with more cutting tools, the cutting tool holder 3 has two or more sets of holes; and the mounting holes 7 of two adjacent sets of holes are spaced apart, with each set of holes corresponding to one type of cutting tool. The cutting tool holder 3 typically corresponds to two or more types of cutting tools, that is, the cutting tool holder 3 has two or more sets of holes, and all sets of holes surround the central hole of the cutting tool holder 3, while the two sets of holes are staggered.

[0045] For reference, each hole group generally uses 3 mounting holes 7, that is, the cutter head can be fixed to the cutter head seat 3 with three Torx screws. The use of three Torx screws can form a better fixed contact surface, making the installation of the cutter head on the cutter head seat 3 more stable.

[0046] For reference, the hole group generally corresponds to the screw on the cutting tool head, so there are usually three screws. For ease of understanding, holes A, B, and C are used to represent the screws on the cutting tool head. Holes A, B, and C are all arranged around the central axis of the cutting tool head, with hole A as the reference hole. The cutting part of the cutting tool head is located between holes A and C. The angle between the relative centers of holes A and B is 120 degrees, and the angle between holes B and C can be between 90 degrees and 120 degrees.

[0047] refer to Figure 5 As shown, one way to set the cutter head is that the angle between hole A and hole B is 120 degrees, and the angle between hole B and hole C is 90 degrees.

[0048] refer to Figure 6 As shown, one way to set the cutter head is that the angle between hole A and hole B is 120 degrees, and the angle between hole B and hole C is 120 degrees.

[0049] In this specification, terms such as "one embodiment," "another embodiment," "embodiment," and "preferred embodiment" refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same term in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0050] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A double-damped vibration-reducing inner hole tool bar, comprising a rod body (1), wherein a cavity (2) is provided inside the rod body (1), and a tool head seat (3) for mounting a tool head is provided at the first end of the rod body (1), characterized in that: The rod body (1) is also provided with a receiving cavity (4) that connects to the cavity (2). A first vibration damping component (5) is installed in the receiving cavity (4). The first end of the first vibration damping component (5) passes through the receiving cavity (4) and connects to the center hole of the cutter head seat (3). The receiving cavity (4) is also equipped with a second vibration damping component (6), which surrounds the first vibration damping component (5); and the two ends of the second vibration damping component (6) respectively abut against the inner wall of the cutter head seat (3) and the rod body (1); the second vibration damping component (6) is used to work with the first vibration damping component (5) to synchronously absorb the vibration of the cutter head seat (3).

2. The double-damped vibration-reducing inner hole tool holder according to claim 1, characterized in that: The second vibration damping component (6) includes an oscillation wave absorber (601) and a fluororubber ring (602). The fluororubber ring (602) is placed at both ends of the oscillation wave absorber (601) and wraps around the surface of the oscillation wave absorber (601). The fluororubber ring (602) is sleeved on the outer wall of the first vibration damping component (5), and the fluororubber rings (602) at both ends of the oscillation wave absorber (601) act as buffer dampers, respectively abutting against the cutter head seat (3) and the inner wall of the receiving cavity (4).

3. The double-damped vibration-reducing inner hole tool holder according to claim 2, characterized in that: The oscillating wave absorber (601) is provided with protrusions (603) at both ends, and the fluororubber ring (602) is provided with grooves (604) for the protrusions (603) to be inserted. The fluororubber ring (602) is fixed on the oscillating wave absorber (601) through the grooves (604).

4. The double-damped vibration-reducing inner hole tool holder according to claim 1, characterized in that: The receiving cavity (4) includes a first receiving area (401) and a second receiving area (402). The second vibration damping component (6) is installed in the first receiving area (401). The two ends of the second receiving area (402) are respectively connected to the first receiving area (401) and the cavity (2); and the end of the first vibration damping component (5) extends into the second receiving area (402).

5. The double-damped vibration-reducing inner hole tool holder according to claim 4, characterized in that: The outer wall of the first vibration damping component (5) is provided with a first sealing groove (501), and a first damping ring (502) is fitted on the first sealing groove (501). The first damping ring (502) is located in the second accommodating area (402) and abuts against the inner wall of the second accommodating area (402).

6. The double-damped vibration-reducing inner hole tool holder according to claim 4, characterized in that: The center hole of the cutter head seat (3) is provided with a second sealing groove (301), and a second damping ring (302) is fitted on the second sealing groove (301). The second damping ring (302) abuts against the outer wall of the first vibration damping component (5) in the first accommodating area (401).

7. The double-damped vibration-reducing inner hole tool holder according to claim 1, characterized in that: The cutter head holder (3) is provided with a hole group, which includes three or more mounting holes (7). The mounting holes (7) of the hole group are all arranged around the central hole of the cutter head holder (3). The mounting holes (7) are used to correspond to the screw holes on the cutter head. The cutter head is fixed to the cutter head holder (3) by bolts through the mounting holes (7).

8. The dual-damping vibration-reducing inner hole tool holder according to claim 7, characterized in that: The tool holder (3) has two or more hole groups; and the mounting holes (7) of two adjacent hole groups are spaced apart, and each hole group corresponds to a tool head.

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