A kind of damping boring bar based on acoustic black hole and boring machine

Abstract

This invention relates to a vibration-damping boring bar and boring machine based on an acoustic black hole, comprising a tool bar with a tool head fixed at one end, a sleeve sleeved at a predetermined position on the tool bar, at least one vibration-damping block fixed on the sleeve, and a cavity inside the vibration-damping block, within which a wedge-shaped tapering vibration-damping component is provided. Along the direction away from the tool head, the thickness of the vibration-damping component gradually decreases to form an acoustic black hole structure. The boring bar of this invention has a simple structure, generates low noise, and has a wide applicable frequency range and strong applicability.

Description

Technical Field

[0001] This invention relates to the field of machining equipment technology, specifically to a vibration-damping boring bar and boring machine based on acoustic black holes. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In practical engineering applications, many deep-hole parts require machining with boring bars having a large length-to-diameter ratio. This includes critical fields such as military equipment and aerospace. Due to the large length-to-diameter ratio of the boring bar, its rigidity is relatively poor, and the boring bar extends inside the workpiece, resulting in harsh working conditions and a high susceptibility to cutting chatter during machining. This reduces tool life and lowers workpiece machining accuracy. Therefore, effectively reducing the vibration amplitude of the boring bar is essential.

[0004] Current vibration damping boring bars are mainly divided into two categories: passive and active. Active vibration damping often requires external control, which presents problems such as high implementation difficulty and low control precision. Passive vibration damping boring bars include particle-damped and friction-damped types. Their working principle is to achieve vibration reduction through particle collision and friction, respectively. During operation, these boring bars generate significant noise and have a limited applicable frequency range, resulting in poor applicability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a vibration-damping boring bar and boring machine based on acoustic black holes, which has a simple structure, low operating noise, and strong applicability.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a vibration-damping boring bar based on an acoustic black hole, including a tool bar, one end of which is fixed with a tool head, a sleeve is sleeved at a set position on the tool bar, at least one vibration-damping block is fixed on the sleeve, the vibration-damping block has a cavity inside, and a vibration-damping component with a wedge-shaped tapering structure is provided in the cavity. Along the direction away from the tool head, the thickness of the vibration-damping component gradually decreases to form an acoustic black hole structure.

[0008] Optionally, the outer peripheral surface of the jacket is provided with a sliding groove, which runs along the axial direction of the jacket. The damping block is provided with a slider that matches the sliding groove, and the slider is embedded in the sliding groove. A locking component is provided between the jacket and the damping block to lock and fix the damping block and the jacket.

[0009] Optionally, the groove is a T-groove, and correspondingly, the slider is a T-shaped slider.

[0010] Optionally, the locking component is a locking bolt, the shank of which is threadedly connected to the damping block, and the shank of the locking bolt passes through the damping block and is inserted into the positioning hole provided on the outer side of the jacket.

[0011] Optionally, the sleeve is detachably connected to the guide rod.

[0012] Optionally, a damping layer is provided at the end of the vibration damping component with the smallest thickness.

[0013] Optionally, the damping layer may be made of damping rubber or damping alloy.

[0014] Secondly, embodiments of the present invention provide a vibration-damping boring bar based on an acoustic black hole, including a boring bar vibration-damping section. One end of the boring bar vibration-damping section is connected to a tool head connecting block, and the other end is connected to a boring bar clamping section. The boring bar vibration-damping section has a cavity inside, and at least one vibration-damping mechanism is provided in the cavity. The vibration-damping mechanism includes a first vibration-damping component and a second vibration-damping component. Both the first vibration-damping component and the second vibration-damping component adopt a wedge-shaped tapering structure. The thickness of the first vibration-damping component and the second vibration-damping component gradually changes along the axial direction of the boring bar vibration-damping section. The ends of the first vibration-damping component and the second vibration-damping component with smaller thickness are connected to form an acoustic black hole structure.

[0015] Optionally, one end of the boring bar vibration damping section is detachably connected to the cutter head connecting block, and the other end is detachably connected to the boring bar clamping section.

[0016] Thirdly, embodiments of the present invention provide a boring machine equipped with a vibration-damping boring bar based on an acoustic black hole as described in the first or second aspect.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The vibration-damping boring bar of the present invention has an acoustic black hole structure inside or an acoustic black hole structure inside the vibration-damping block outside. Vibration is reduced by the acoustic black hole structure. Compared with traditional particle damping vibration-damping boring bars and friction damping vibration-damping boring bars, the structure of the entire boring bar is simpler, easier to manufacture, and generates less noise during the manufacturing process. Moreover, compared with particle damping collision vibration reduction and friction vibration reduction, the acoustic black hole vibration reduction method has a wider applicable vibration reduction frequency range, making the entire vibration-damping boring bar more versatile.

[0019] 2. Due to the influence of processing technology, the thickness of the end with the smallest thickness of the vibration damping component in the vibration damping boring bar of the present invention cannot reach the optimal thickness requirement. Therefore, a uniform thickness part is set, the thickness of which is greater than the optimal thickness, which cannot form the optimal ideal acoustic black hole structure. By setting a damping layer, this defect is overcome and the vibration damping performance is optimized.

[0020] 3. In the vibration damping boring bar of the present invention, the vibration damping block is connected to the jacket through a sliding groove and a sliding block, and the sliding groove is set along the axial direction of the jacket. The vibration damping block and the jacket are locked and fixed by a locking component. The vibration damping block is easy and quick to disassemble and install, and it is convenient to replace the appropriate vibration damping block according to the frequency of the cutting force. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the vibration reduction structure in Embodiment 1 of the present invention;

[0024] Figure 3 This is the present invention. Figure 2 Sectional view along direction A in the middle;

[0025] Figure 4 This is the present invention. Figure 3 Enlarged view of section I in the image;

[0026] Figure 5 This is a schematic diagram of the dimensions of the vibration damping component in Embodiment 1 of the present invention;

[0027] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0028] Figure 7 This is a schematic diagram of the vibration damping section structure of the boring bar in Embodiment 2 of the present invention. Figure 1 ;

[0029] Figure 8 This is a schematic diagram of the vibration damping section structure of the boring bar in Embodiment 2 of the present invention. Figure 2 ;

[0030] Figure 9 This is a schematic diagram of the vibration damping section structure of the boring bar in Embodiment 2 of the present invention. Figure 3 ;

[0031] Figure 10 This is a schematic diagram of vibration reduction in Embodiment 2 of the present invention;

[0032] Figure 11 This is a comparison diagram of the vibration reduction effect of Embodiment 2 of the present invention and a conventional boring bar;

[0033] Among them, 1. cutter head, 2. vibration damping mechanism, 3. cutter bar, 4. cutter head connecting block, 5. boring bar vibration damping section, 6. boring bar clamping section;

[0034] 21. Vibration damping component; 22. Damping plate; 23. Vibration damping block; 24. Locking bolt; 25. Jacket; 26. Fixing nut; 27. Fixing bolt;

[0035] 51. First vibration damping component; 52. Second vibration damping component. Detailed Implementation

[0036] Example 1

[0037] This embodiment provides a vibration-damping boring bar based on an acoustic black hole, employing an external acoustic black hole structure for vibration reduction, such as... Figure 1 As shown, it includes a tool holder 3, and a tool head 1 is provided at one end of the tool holder 3. The structure of the tool holder 3 and the tool head 1 can be achieved using existing technology, and their specific structure will not be described in detail here.

[0038] A vibration damping mechanism 2 is provided at the set position of the tool holder 3, such as... Figures 2-4 As shown, the vibration damping mechanism 2 includes a sleeve 25 and a damping block 23. The tool holder 3 is sleeved with the sleeve 25, and the set position is the position where the vibration amplitude of the tool holder 3 is the largest during processing.

[0039] In this embodiment, the sleeve 25 is detachably connected to the tool holder 3, and the position of the sleeve 25 on the tool holder 3 can be adjusted.

[0040] Specifically, the sleeve 25 adopts an annular structure that matches the cross-section of the tool holder 3, and the inner diameter cross-section size is the same as the cross-section size of the tool holder. When the cross-section of the tool holder 3 is circular, the sleeve 25 is a circular structure; when the cross-section of the tool holder 3 is square, the sleeve 25 is a square structure.

[0041] The sleeve 25 is provided with a notch to facilitate the installation of the sleeve. The ends of the sleeve on both sides of the notch are provided with fixing plates, and fixing holes are provided on the fixing plates.

[0042] In use, the sleeve is pried open through the notch, and then the sleeve 25 is placed on the outer circumference of the tool holder 3. Then, the fixing bolt 27 is passed through the fixing hole, and the fixing nut 26 is tightened to fix the sleeve 25 to the tool holder 3.

[0043] Loosen the fixing nut 26 and fixing bolt 27, and the collet 25 can move along the axis of the tool holder 3, thereby adjusting the position of the collet 25 on the tool holder 3.

[0044] At least one damping block 23 is fixed on the outer peripheral surface of the sleeve 25. The orientation of the damping block 23 is determined according to the actual vibration of the tool bar 3. Preferably, three damping blocks 23 are provided on the outer peripheral surface of the sleeve 25.

[0045] The vibration damping block 23 has a cavity, and a vibration damping component 21 is provided in the cavity. The vibration damping component 21 adopts a wedge-shaped tapering structure. Along the axis of the tool bar 3 away from the tool head 1, the thickness of the vibration damping component 21 gradually decreases and the upper and lower surfaces are concave arc surfaces to form an acoustic black hole structure, which plays a role in vibration damping.

[0046] The thicker end of the vibration damping component 21 is fixed to the cavity surface near the cutter head 1. The thinner end of the vibration damping component 21 has a section of uniform thickness. In actual processing, due to limitations in processing technology, the thinnest end of the vibration damping component 21, i.e., the section of uniform thickness, cannot achieve the optimal thickness. Its thickness is greater than the optimal thickness, so the optimal ideal acoustic black hole structure cannot be achieved. To compensate for this defect, a damping layer 22 is provided on the side of the uniform thickness section of the thinner end of the vibration damping component 21 near the cutter head 3 to optimize the vibration damping effect.

[0047] The damping layer 22 is made of damping rubber or damping alloy, and the damping layer 22 is bonded and fixed to the uniform thickness portion of the vibration damping component 21.

[0048] like Figure 5 As shown, the dimensions of the vibration damping component 21 are designed as follows:

[0049] The thickness of the vibration damping component 21 is h(x).

[0050]

[0051] The axis of the acoustic black hole structure is used as the dividing line, and the thickness of the damping component is h(x). The origin is located at the end with the smaller thickness. x1 is the distance from the boundary line between the acoustic black hole region and the uniform part at the end to the end face with the smallest thickness. x2 is the length of the damping component along the axis. h0 is the thickness of the uniform part at the end, h0≥0. ε is the slope of the profile, ε>0. m is the order of the acoustic black hole, m≥2.

[0052] The vibration damping component 21 is made of the same metal material as the vibration damping block and is integrally formed with the vibration damping block 23. Alternatively, the vibration damping component 21 is made of vibration-absorbing materials such as rubber, and the vibration damping block 23 is bonded or fixed inside the cavity after processing.

[0053] In this embodiment, in order to facilitate the replacement of the vibration damping block 23, the vibration damping block 23 and the jacket 25 are detachably and fixedly connected.

[0054] Furthermore, the outer peripheral surface of the sleeve 25 where the vibration damping block 23 is installed is provided with a sliding groove. The sliding groove is provided along the axial direction of the sleeve 25, that is, the sliding groove passes through the two end faces of the sleeve 25. The vibration damping block 23 is provided with a slider that matches the sliding groove. The slider is embedded in the sliding groove, and a locking component is provided between the vibration damping block 23 and the sleeve 25.

[0055] Preferably, the slide groove is a T-shaped slide groove, and correspondingly, the slider is a T-shaped slider.

[0056] The locking component uses a locking bolt 24. The damping block 23 is provided with a threaded hole on one side of the cavity. The threaded hole is arranged radially along the tool bar 3. The rod of the locking bolt 24 is threadedly connected to the damping block 23 through the threaded hole. The rod of the locking bolt 24 is inserted into the positioning hole provided on the outer circumferential surface of the sleeve 25 to realize the fixed connection between the damping block 23 and the sleeve 25.

[0057] The dimensions of the damping block 23 along the axis of the tool holder are the same as those of the sleeve 25 along the axis. When installing the damping block 23, the T-shaped slider is aligned with the T-shaped groove, and then the T-shaped slider is inserted into the T-shaped groove and slid along the T-shaped groove so that the end face of the damping block 23 is aligned with the end face of the sleeve 25. Then the locking bolt 24 is screwed in, and the rod of the locking bolt 24 is inserted into the positioning hole, thus fixing the damping block 23 and the sleeve 25.

[0058] In this embodiment, the different damping blocks 23 are only different in the size of their internal cavities and the size of their damping components 21, while the rest of their structures and dimensions are the same, so that the different damping blocks 23 can all be matched with the jacket 25. In this way, the damping blocks are easy and quick to disassemble and install, and it is convenient to replace the appropriate damping blocks according to the frequency of the cutting force to achieve the best damping effect.

[0059] In this embodiment, any number of sleeves 25 and vibration damping blocks 23 can be set on the tool holder 3. The number and position can be determined according to the actual vibration conditions.

[0060] In this embodiment, a sleeve 25 and a damping block 23 are placed at the position where the vibration amplitude of the tool holder 3 is the largest. When the vibration of the tool holder 3 is in the low-order mode, the vibration amplitude is the largest near the tool head 1. The damping structure 2 is installed on the tool holder 3 near the tool head 1. Different cutting parameters will affect the cutting force frequency, resulting in different frequencies of vibration instability of the tool holder 3. The damping blocks 23 containing different acoustic black hole structures are replaced to ensure that the natural frequency of the damping structure 2 is consistent with the main frequency of the cutting force. The specific adjustment method is as follows:

[0061] When the cutting force frequency is high, replace the damping block 23. The cavity inside the damping block 23 is smaller, which improves the stiffness of the damping structure 2.

[0062] When the cutting force frequency is low, replace the damping block 23. The internal cavity of the damping block 23 is larger, which reduces the stiffness of the damping structure 2.

[0063] The vibration reduction principle of this embodiment is as follows:

[0064] Based on actual working conditions, select the location and quantity of vibration damping blocks 23, install the vibration damping blocks 23 in the sleeve 25, and fix them using locking bolts 24. Clamp the sleeve 25 onto the tool holder 3 using bolts and nuts.

[0065] When the tool holder 3 experiences chattering during machining, the acoustic black hole structure in the vibration damping structure 2 will dissipate the vibration energy to achieve the purpose of vibration reduction.

[0066] This embodiment of the vibration-damping boring bar decomposes the vibration-damping structure into a jacket and vibration-damping blocks, forming two modules. Standardizing, unifying, and unitizing these two modules greatly improves replaceability and versatility. Vibration-damping blocks with acoustic black hole structures can be installed in T-slots at different orientations based on the vibration amplitude of the tool bar in different directions. The acoustic black hole structure is used as the damping structure. This structure alleviates the impact of wear and tear on the vibration-damping performance of the tool bar during use, thus improving the stability of the tool bar during machining.

[0067] Example 2

[0068] This embodiment provides a vibration-damping boring bar based on an acoustic black hole, which uses an embedded acoustic black hole structure for vibration reduction.

[0069] like Figure 6 As shown, the vibration-damping boring bar includes a cutter head connecting block 4, a boring bar vibration-damping section 5, and a boring bar clamping section 6 arranged sequentially. The cutter head connecting block can use an existing structure for connecting the cutting tool, and the boring bar clamping end adopts a cylindrical structure for connecting to the power system of the boring machine.

[0070] The two ends of the boring bar damping section 5 are detachably and fixedly connected to the cutter head connecting block 4 and the cutter head clamping section 6, respectively.

[0071] Specifically, one end of the boring bar damping section 5 is coaxially provided with an external threaded post, and the other end is coaxially provided with an internal threaded hole that matches the external threaded post. The two boring bar damping sections 5 can be spliced ​​together. Correspondingly, the cutter head connecting block 4 is provided with an internal threaded hole that matches the external threaded post, and the splicing end of the boring bar clamping section 6 is provided with an external threaded post that matches the internal threaded hole. The external threaded post and the internal threaded hole are threadedly connected to realize the detachable fixed connection of the boring bar damping section 5, the cutter head connecting block 4, and the boring bar clamping section 6.

[0072] The entire vibration damping boring bar adopts a segmented design to facilitate modularization, standardization, and uniformity. It can be combined according to on-site processing requirements to meet working conditions.

[0073] The boring bar damping section 5 has a cavity inside, and at least one damping mechanism is installed inside the cavity. In this embodiment, for example... Figure 7As shown, a vibration damping mechanism is provided inside the cavity. The vibration damping mechanism includes a first vibration damping component 51 and a second vibration damping component 52. Both the first vibration damping component 51 and the second vibration damping component 52 adopt a wedge-shaped tapering structure, and their upper and lower surfaces are concave arc surfaces. The thickness of the first vibration damping component 51 and the second vibration damping component 52 gradually changes along the axial direction of the boring bar vibration damping section 5, forming an acoustic black hole structure. The ends of the first vibration damping component 51 and the second vibration damping component 52 with smaller thickness are integrally connected. That is, along the direction away from the cutter head connecting block, the thickness of the first vibration damping component 51 gradually decreases, and the thickness of the second vibration damping component 52 gradually increases.

[0074] To meet processing requirements, the ends of the first damping component 51 and the second damping component 52 with smaller thickness are each provided with an end of uniform thickness, and are integrally connected through the uniform thickness section.

[0075] In another implementation, such as Figure 8 As shown, two vibration damping mechanisms are provided, which are arranged radially along the damping section 5 of the boring bar.

[0076] In the third implementation, such as Figure 9 As shown, six vibration damping mechanisms are provided, with each pair of vibration damping mechanisms forming a group, resulting in three groups of vibration damping mechanisms. The three groups of vibration damping mechanisms are distributed radially along the damping section 5 of the boring bar, and the two vibration damping mechanisms in the same group are distributed along the axial direction of the damping section 5 of the boring bar.

[0077] It is understandable that the arrangement of the vibration damping mechanism can be determined based on the calculation results of the vibration frequency of the vibration damping structure, and will not be described in detail here.

[0078] In this embodiment, the thickness of the first damping component 51 and the second damping component 52 gradually increases along the direction from their connecting end to the other end, and their thickness is in the form of a power-law h(x) = h0 + εgx. m The change is m≥2 (where the exponent m is greater than or equal to 2).

[0079] h(x) represents the thickness of the first and second vibration damping components at a certain cross-section, h0 represents the thickness of the uniform portion at the end (h0≥0), x represents the distance between the cross-section and the connection end of the first and second vibration damping components, and ε represents the slope of the cross-section (ε>0).

[0080] The number and structure of the vibration damping sections of the boring bar can be determined according to the on-site machining requirements. Different working conditions can be met by changing the number and structure of the vibration damping sections of the boring bar.

[0081] In this embodiment, as Figure 10 As shown, when the boring bar experiences cutting chatter, the mechanical wave generated is a transverse wave. The vibration wave is transmitted to the acoustic black hole structure inside the vibration damping section 5 of the boring bar, which captures the generated vibration wave and thus produces the effect of vibration reduction and noise reduction.

[0082] In a practical application of this embodiment:

[0083] The boring bar is selected with a total length of 180mm, an overhang length of 125mm, and a diameter of 16mm.

[0084] In the acoustic black hole effect structure function, both the coefficients ε and the exponent m affect the vibration reduction effect. The acoustic black hole effect structure function in this model is taken as...

[0085] h(x) = 0.01gx 2 (5 <x≤20)

[0086] The vibration damping boring bar was structurally analyzed using the finite element simulation software Ansys. The acoustic black hole effect structure was selected and constructed according to the previous power law function. The length of the uniform thickness section was 5 mm, and the radial thickness dimension was 8 mm.

[0087] The tool head connecting block, boring bar vibration damping section, and boring bar clamping section are made of 42CrMo material.

[0088] The vibration damping structure within the boring bar's vibration damping section is made of Q235 steel. The boring bar's vibration damping section is manufactured using additive manufacturing technology.

[0089] This embodiment is compared with a boring bar of identical size without the attached acoustic black hole structure. Figure 11 As shown.

[0090] The working principle of this embodiment is as follows:

[0091] First, assemble the various parts of the boring bar: the cutter head connecting block, the boring bar vibration damping section, and the boring bar clamping section. Only one section of the boring bar vibration damping section is needed; multiple sections can be selected for assembly depending on the actual working conditions.

[0092] Install the vibration-damping boring bar with embedded vibration-damping structure on the corresponding boring machine, connect the boring tool to the tool head connecting block, and install an acceleration sensor on the boring machine.

[0093] After determining the cutting parameters and the corresponding workpiece, a trial cut is performed on the workpiece. Vibration signals are collected by an accelerometer and then compared and analyzed.

[0094] When the boring bar is machining, the cutting tool on the tool head connector comes into contact with the workpiece, and the interaction between them generates vibrations. At this time, the tool head connector generates mechanical waves. When the mechanical waves pass through the cavity in the vibration damping section of the boring bar, the acoustic black hole structure absorbs and dissipates the vibration energy transmitted from the tool head connector.

[0095] The vibration-damping boring bars of Examples 1 and 2 feature an acoustic black hole structure that can capture vibrations generated during the cutting process. Their unique dynamic characteristics avoid the impact on vibration damping performance of traditional passive vibration-damping boring bars caused by the collision or friction of damping particles during operation. This results in a more durable flutter suppression effect, and the acoustic black hole structure provides a wider range of applicable vibration damping frequencies, making the entire vibration-damping boring bar more versatile.

[0096] The acoustic black hole structure consists of a simple wedge-shaped tapering structure, which is a simple geometric structure and is easier to manufacture.

[0097] Example 3

[0098] This embodiment provides a boring machine equipped with a vibration-damping boring bar based on an acoustic black hole as described in Embodiment 1 or Embodiment 2. The remaining structure of the boring machine can adopt existing technology and will not be described in detail here.

[0099] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vibration-damping boring bar based on acoustic black holes, comprising a tool holder, one end of which is fixed with a cutting head, characterized in that, A sleeve is fitted at a set position on the tool holder, and at least one damping block is fixed on the sleeve. The damping block has a cavity inside, and a damping component with a wedge-shaped tapering structure is provided inside the cavity. The thickness of the damping component gradually decreases along the direction away from the tool head to form an acoustic black hole structure.

2. The vibration-damping boring bar based on an acoustic black hole as described in claim 1, characterized in that, The outer circumferential surface of the jacket is provided with a sliding groove, which runs along the axial direction of the jacket. The damping block is provided with a slider that matches the sliding groove, and the slider is embedded in the sliding groove. A locking component is provided between the jacket and the damping block to lock and fix the damping block and the jacket.

3. The vibration-damping boring bar based on an acoustic black hole as described in claim 2, characterized in that, The groove is a T-shaped groove, and correspondingly, the slider is a T-shaped slider.

4. A vibration-damping boring bar based on an acoustic black hole as described in claim 2, characterized in that, The locking component uses a locking bolt. The shank of the locking bolt is threadedly connected to the damping block, and the shank of the locking bolt passes through the damping block and is inserted into the positioning hole provided on the outer side of the jacket.

5. A vibration-damping boring bar based on an acoustic black hole as described in claim 1, characterized in that, The sleeve is detachably connected to the guide rod.

6. A vibration-damping boring bar based on an acoustic black hole as described in claim 1, characterized in that, The damping component has a damping layer at its thinnest end.

7. A vibration-damping boring bar based on an acoustic black hole as described in claim 6, characterized in that, The damping layer is made of damping rubber or damping alloy.

8. A vibration-damping boring bar based on acoustic black holes, characterized in that, The device includes a boring bar damping section, one end of which is connected to a tool head connecting block, and the other end is connected to a boring bar clamping section. The boring bar damping section has a cavity inside, and at least one damping mechanism is installed inside the cavity. The damping mechanism includes a first damping component and a second damping component. Both the first and second damping components adopt a wedge-shaped tapering structure. The thickness of the first and second damping components gradually changes along the axial direction of the boring bar damping section. The ends of the first and second damping components with smaller thicknesses are connected to form an acoustic black hole structure.

9. A vibration-damping boring bar based on an acoustic black hole as described in claim 8, characterized in that, One end of the boring bar vibration damping section is detachably connected to the cutter head connecting block, and the other end is detachably connected to the boring bar clamping section.

10. A boring machine, characterized in that, The vibration damping boring bar based on acoustic black holes as described in claim 1 or claim 8 is provided.

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