Tool arranging machine

Abstract

The invention discloses a tool arranging machine, and belongs to the technical field of dental medical instruments. The tool arranging machine comprises a tool assembly for cutting a workpiece, a workpiece driving assembly for driving the workpiece to rotate and a workpiece vibration stabilizing assembly. The workpiece vibration stabilizing assembly comprises a driving air cylinder, a first connecting piece, a second connecting piece, a damping piece, an abutting head and a third connecting piece. The tail end of a first telescopic rod of the driving cylinder is fixedly connected with one end of a third connecting piece; the first telescopic rod is sleeved with the first connecting piece in a sliding mode. The first connecting piece comprises a first connecting arm and a second connecting arm. The end part of the first connecting arm is rotationally connected with the second connecting piece; one end of the damping piece is rotationally connected with the second connecting piece, and the other end is fixedly connected with the abutting head; the other end of the third connecting piece is fixedly connected with the first telescopic rod; a miniature pressure sensor is installed in the abutting head and abuts against the surface of the workpiece. The pressure between the abutting head and the workpiece can be accurately controlled, machining resonance is effectively avoided, and the flatness and smoothness of the surface of the workpiece are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of dental medical device technology, and more specifically, to a dental scalpel machine. Background Technology

[0002] In the field of precision machining, multi-tool machining centers play a crucial role in the mass production of complex and precision parts such as shafts and discs due to their high rigidity, high efficiency, and continuous machining capabilities, and are indispensable, especially in the manufacture of dental implants. Dental implants are inserted into the alveolar bone to replace missing teeth, and their quality directly impacts the patient's treatment outcome and quality of life, thus requiring stringent standards for machining accuracy and surface quality. Among these, the surface microstructure and integrity of the implant matrix are one of the core factors affecting its osseointegration and other properties.

[0003] In actual production, when using traditional rotary tool machines to process dental implant substrates, resonance is prone to occur due to the matching of dynamic characteristics of the processing system. This is because the dynamic fluctuation of cutting force is coupled with the natural frequency of the process system. Factors such as material inhomogeneity and changes in cutting thickness cause fluctuations in cutting force. When the fluctuation frequency is close to or coincides with the natural frequency, the system will resonate, resulting in vibration of the relative displacement between the tool and the workpiece.

[0004] The vibrations generated by resonance leave fine ripples on the processed surface of the implant matrix, reducing surface smoothness and disrupting the microstructure. These ripples also introduce residual stress, microcracks, and other microscopic defects, weakening the implant's mechanical properties and making it more prone to premature failure in the oral cavity. Furthermore, rough or defective surfaces affect protein adsorption and osteoblast activity, reducing bone integration and healing speed, increasing the risk of surgical failure. Resonance has a more pronounced impact on the ripple problems of delicate structures such as implant threads and micropores. This not only affects the connection precision and sealing with the abutment but also accelerates corrosion and fatigue failure in areas of stress concentration.

[0005] The above-mentioned problems urgently need to be solved, therefore, the present invention provides a cascade knife machine. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a sectional cutting machine that can accurately control the pressure between the abutment and the workpiece, effectively avoid resonance, and prevent the workpiece surface from having textures caused by resonance, thereby greatly improving flatness and smoothness.

[0007] The technical solution adopted by this invention to solve its technical problem is: to provide a sectional cutting machine for cutting workpieces, comprising: A tool assembly for cutting the workpiece; A workpiece drive assembly that drives the workpiece to rotate; The workpiece vibration stabilization assembly includes a drive cylinder, a first connecting member, a second connecting member, a damping member, an abutment joint, and a third connecting member; The end of the first telescopic rod of the drive cylinder is fixedly connected to one end of the third connecting member; The first connector is slidably sleeved on the first telescopic rod of the drive cylinder, and the first connector includes a first connecting arm and a second connecting arm arranged at an angle. The ends on both sides of the first connecting arm are rotatably connected to the second connecting member; One end of the damping member is rotatably connected to the second connecting member, and the other end of the damping member is fixedly connected to the abutment. One end of the third connector is rotatably connected to the middle of the abutment, and the other end of the third connector is fixedly connected to the telescopic rod. A miniature pressure sensor is installed in the abutment, and the abutment abuts against the surface of the workpiece.

[0008] Furthermore, the drive cylinder includes a telescopic first telescopic rod and a first spring sleeved on the first telescopic rod, the first spring being disposed between the first connecting member and the third connecting member.

[0009] Furthermore, the workpiece vibration stabilization assembly is fixed on the workpiece drive assembly, and the damping component includes a telescopic second telescopic rod and a second spring sleeved on the second telescopic rod.

[0010] Furthermore, the first connector is "X" shaped, the second connector is "V" shaped, and the first connector and the second connector have two rotational connection points.

[0011] Furthermore, the gantry mill also includes a worktable, and the workpiece drive assembly includes a connecting flange and a fixed seat. The bottom end of the fixed seat is fixed to the worktable, and the middle part of the fixed seat is engaged with the connecting flange.

[0012] Furthermore, the fixing seat is L-shaped, and the fixing seat is detachably installed on the connecting flange, with one end of the driving cylinder fixed on the fixing seat.

[0013] Furthermore, the tool cascading machine also includes an X-axis drive assembly and a Z-axis drive assembly for driving the tool assembly to move. The X-axis drive assembly includes a first mounting base and a first guide rail mounted in the first mounting base, and a friction damping layer is provided between the first mounting base and the first guide rail.

[0014] Furthermore, the Z-axis drive assembly includes a second guide rail, the tool assembly includes a tool holder, and a friction damping layer is provided between the second guide rail and the tool holder.

[0015] Furthermore, the tool assembly also includes a tool holder mounted on the tool holder, and a friction damping layer is provided between the tool holder and the tool holder.

[0016] Furthermore, the friction damping layer is nitrile rubber.

[0017] The beneficial effects of this invention are: This invention, through the coordinated operation of the drive cylinder, first connector, second connector, damping component, abutment, and third connector in the workpiece vibration stabilization assembly, can precisely control the pressure between the abutment and the workpiece. During processing, the pressure of the abutment can be adjusted in real time according to the actual situation, thereby changing the vibration frequency of the workpiece. This ensures that the vibration frequency of the workpiece always avoids the frequency range where resonance may occur between the tool assembly and the workpiece, fundamentally preventing resonance from occurring. Because resonance is effectively avoided, the workpiece surface no longer exhibits textures caused by resonance, and the flatness and smoothness are significantly improved, making it particularly suitable for the high-precision machining requirements of micro-parts in medical devices. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] In the picture: Figure 1 This is a schematic diagram of the structure of the cascade knife machine of the present invention; Figure 2 for Figure 1 Another structural schematic diagram of the medium-bar cutting machine; Figure 3 for Figure 1 Exploded view of a medium-sized cutting machine; Figure 4 for Figure 3 A magnified view of part A in the image; Figure 5 for Figure 3 Another structural schematic diagram of the Z-axis drive assembly; Figure 6 for Figure 3 Another structural schematic diagram of the cutting tool assembly; Figure 7 for Figure 3 Schematic diagram of the structure of the workpiece vibration stabilization assembly; Figure 8 for Figure 7 Front view of the vibration stabilization assembly for the workpiece; Figure 9 for Figure 8 A schematic diagram of the structure of the workpiece vibration stabilization assembly in another state; Figure 10 for Figure 7 Exploded view of the vibration stabilization assembly for the workpiece.

[0020] 100. Tool rack; 10. X-axis drive assembly; 11. X-axis drive motor; 12. First lead screw; 13. First ball nut; 14. First mounting base; 141. First slide groove; 142. Second slide groove; 143. Third slide groove; 15. First guide rail; 20. Z-axis drive assembly; 21. Z-axis drive motor; 22. Second lead screw; 23. Second ball nut; 24. Second mounting base; 241. Slide groove one; 25. First slider; 26. Second slider; 27. Second guide rail; 30. Tool assembly; 31. Tool holder; 32. Tool rack 33. Tool holder; 40. Cutting tool; 41. Workpiece vibration stabilization assembly; 41. Drive cylinder; 411. First telescopic rod; 412. First spring; 42. First connector; 421. First connecting arm; 422. Second connecting arm; 43. Second connector; 44. Damping component; 441. Second telescopic rod; 442. Second spring; 45. Abutment joint; 46. Third connector; 50. Workpiece drive assembly; 51. Servo motor; 52. Rotary cylinder; 53. Synchronous belt; 54. Connecting flange; 55. Fixed base; 60. Workpiece; 70. Worktable. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] like Figure 1-10 As shown, the present invention provides a sectional cutting machine 100 for cutting workpiece 60. The sectional cutting machine 100 includes a cutting tool assembly 30, an X-axis driving assembly 10 for driving the cutting tool assembly 30 to move on the X-axis, a Z-axis driving assembly 20 for driving the cutting tool assembly 30 to move on the Z-axis, a workpiece vibration stabilizing assembly 40 placed above the workpiece 60, a workpiece driving assembly 50 for driving the workpiece 60 to rotate, and a worktable 70.

[0023] In this embodiment, specifically, the workpiece vibration stabilization assembly 40 includes a drive cylinder 41, a first connector 42, a second connector 43, a damping component 44, an abutment joint 45, and a third connector 46.

[0024] The end of the first telescopic rod 411 of the drive cylinder 41 is fixedly connected to one end of the third connector 46. The first connector 42 is slidably sleeved on the first telescopic rod 411 and includes a first connecting arm 421 and a second connecting arm 422 arranged at an angle. In this embodiment, the first connector 42 has an "X" shaped structure.

[0025] The ends of both sides of the first connecting arm 421 are rotatably connected to the second connecting member 43. The second connecting member 43 has a "V" shaped structure, and the first connecting member 42 and the second connecting member 43 have two rotatable connection points.

[0026] One end of the damping member 44 is rotatably connected to the second connecting member 43, and the other end is fixedly connected to the abutment 45. The damping member 44 includes a telescopic second telescopic rod 441 and a second spring 442 sleeved on the second telescopic rod 441.

[0027] One end of the third connecting member 46 is rotatably connected to the middle of the abutment 45, and the other end is fixedly connected to the first telescopic rod 411. A miniature pressure sensor is installed in the abutment 45 to monitor the pressure between the abutment 45 and the workpiece 60 in real time. The drive cylinder 41 includes a telescopic first telescopic rod 411 and a first spring 412 sleeved on the first telescopic rod 411. The first spring 412 is disposed between the first connecting member 42 and the third connecting member 46.

[0028] When the drive cylinder 41 retracts, the first telescopic rod 411 shortens, the first spring 412 is compressed, the second connecting member 43 rotates about its connection point with the first connecting member 42, and the damping member 44 rotates about its connection point with the third connecting member 46. At this time, the second telescopic rod 441 extends, and the holding pressure between the abutment 45 and the workpiece 60 decreases. When the drive cylinder 41 extends, the first telescopic rod 411 extends, the first spring 412 extends, the second connecting member 43 rotates about its connection point with the first connecting member 42, and the damping member 44 rotates about its connection point with the third connecting member 46. At this time, the second telescopic rod 441 is compressed, and the holding pressure between the abutment 45 and the workpiece 60 increases. The workpiece vibration stabilization assembly 40 controls the pressure between the abutment 45 and the workpiece 60 through the rotatable second connector 43 and the damping component 44. By applying different pressure values, the vibration frequency of the workpiece 60 is controlled and changed to avoid resonance between the tool assembly 30 and the workpiece 60, thereby preventing texture from appearing on the surface of the workpiece 60 during resonance processing.

[0029] In some other embodiments, specifically, a miniature pressure sensor is installed in the abutment 45.

[0030] In this embodiment, specifically, the X-axis drive assembly 10 includes an X-axis drive motor 11, a first lead screw 12, a first ball nut 13, a first mounting base 14, and a first guide rail 15. The X-axis drive motor 11 drives the first lead screw 12 to rotate. The first ball nut 13 is rotatably connected to the first lead screw 12. The first mounting base 14 has a first groove 141, a second groove 142, and a third groove 143. The first ball nut 13 is embedded in the second groove 142. When the X-axis drive motor 11 drives the first lead screw 12 to rotate, the first ball nut 13 moves along the X-axis direction on the first lead screw 12. The first guide rail 15 is embedded in the first groove 141 and the third groove 143. A friction damping layer is provided between the first guide rail 15 and the first mounting base 14.

[0031] In this embodiment, specifically, the Z-axis drive assembly 20 includes a Z-axis drive motor 21, a second lead screw 22, a second ball nut 23, a second mounting base 24, and a second guide rail 27. A first slider 25 is mounted on the side of the second mounting base 24 facing the X-axis drive assembly 10, and a second slider 26 is provided on the side of the second mounting base 24 facing the tool assembly 30. A first groove 241 is opened in the second mounting base 24, and the second ball nut 23 is embedded in the first groove 241.

[0032] In this embodiment, specifically, the tool assembly 30 includes a tool holder 31, a tool rack 32 fixed on the tool holder 31, and a cutting tool 33 fixed on the tool rack 32. The second guide rail 27 is fixed on the side facing the Z-axis drive assembly 20, and a friction damping layer is provided between the second guide rail 27 and the tool holder 31.

[0033] In this embodiment, specifically, the friction damping layer is nitrile rubber. The friction damping layers between the X-axis drive assembly 10 and the Z-axis drive assembly 20, the friction damping layer between the Z-axis drive assembly 20 and the tool assembly 30, and the friction damping layer between the tool holder 31 and the cutting tool 33 constitute a three-level damping layer, which reduces the vibration transmitted to the X-axis drive assembly 10 and the Z-axis drive assembly 20 when the cutting tool 33 processes the workpiece 60, and protects the workpieces of the X-axis drive assembly 10 and the Z-axis drive assembly 20.

[0034] In this embodiment, specifically, the workpiece driving assembly 50 includes a servo motor 51, a rotary cylinder 52, a synchronous belt 53, a connecting flange 54, and a fixed seat 55. The bottom end of the fixed seat 55 is fixed on the worktable 70, and a circular through hole is opened in the middle of the fixed seat 55. The connecting flange 54 is embedded in the through hole. The fixed seat 55 is "L" shaped and is detachably located between the connecting flanges 54. One end of the driving cylinder 41 is fixed on the fixed seat 55. By removing the bolts on the connecting flange 54, the fixed seat 55 can be removed from the connecting flange 54, which facilitates the installation and disassembly of the fixed seat 55 and the workpiece vibration stabilization assembly 40.

[0035] The working process of a sectional knife machine according to the present invention: The workpiece 60 to be processed is mounted on the connecting flange 54 of the workpiece drive assembly 50 and firmly clamped by a fixture to ensure that the workpiece will not shift or loosen during high-speed rotation. Simultaneously, according to the material, shape, and processing requirements of the workpiece, a suitable type of cutting tool 33 is installed on the tool holder 32 of the tool assembly 30. The tool holder machine is started, and the servo motor 51 of the workpiece drive assembly 50 begins to operate, transmitting power to the rotary cylinder 52 via the synchronous belt 53, thereby driving the connecting flange 54 and the workpiece 60 fixed thereon to rotate at high speed. While the workpiece 60 rotates, the X-axis drive assembly 10 and the Z-axis drive assembly 20 also begin to work in coordination. X-axis drive motor 11 drives the first lead screw 12 to rotate, causing the first ball nut 13 to move along the X-axis direction on the first lead screw 12, thereby driving the tool assembly 30 mounted on the first mounting base 14 to make precise displacement adjustments in the X-axis direction; Z-axis drive motor 21 drives the second lead screw 22 to rotate, causing the second ball nut 23 to move along the Z-axis direction on the second lead screw 22, realizing the movement of the tool assembly 30 in the Z-axis direction. Through the cooperation of the X-axis and Z-axis drive assemblies, the cutting tool 33 can accurately move to the workpiece 60 to be processed position. After the cutting tool 33 reaches the designated position, the cutting process officially begins. As the workpiece 60 rotates at high speed, the cutting tool 33 cuts the surface of the workpiece, removing excess material and gradually completing the processing task. During the cutting process, when resonance occurs between the workpiece 60 and the cutting tool 33, the drive cylinder 41 controls the extension and retraction of the first telescopic rod 411 according to a preset program or by real-time monitoring of the workpiece vibration. When the first telescopic rod 411 extends, the first spring 412 is stretched, the second connecting member 43 rotates about its connection point with the first connecting member 42, and the damping member 44 rotates about its connection point with the third connecting member 46, causing the second telescopic rod 441 to be compressed, and the abutment 45 to apply greater pressure to the surface of the workpiece 60. Conversely, when the first telescopic rod 411 retracts, the first spring 412 is compressed, the second telescopic rod 441 extends, and the holding pressure between the abutment 45 and the workpiece 60 decreases. When resonance ceases, the first telescopic rod 411 continues to retract, disengaging the workpiece vibration stabilization assembly from the workpiece surface. In this way, the workpiece vibration stabilization assembly 40 can precisely control the pressure between the abutment 45 and the workpiece 60, thereby changing the vibration frequency of the workpiece 60. By adjusting the pressure value in real time, the vibration frequency of the workpiece 60 is always kept away from the frequency range where resonance may occur between the tool assembly 30 and the workpiece 60, effectively preventing resonance, ensuring the machining quality of the workpiece surface, and preventing the appearance of textures.

[0036] Throughout the machining process, a three-tiered damping layer, consisting of the friction damping layers between the X-axis drive assembly 10 and the Z-axis drive assembly 20, the friction damping layer between the Z-axis drive assembly 20 and the tool assembly 30, and the friction damping layer between the tool holder 31 and the cutting tool 33, effectively reduces the transmission of vibrations generated by the cutting tool 33 during machining of the workpiece 60 to the X-axis drive assembly 10 and the Z-axis drive assembly 20. This further protects these critical components and improves the overall stability and machining accuracy of the gantry mill. After completing a machining operation or the entire workpiece is machined, the operator uses the control system to retract the cutting tool 33 back to its initial position via the X-axis drive assembly 10 and the Z-axis drive assembly 20, then stops the operation of the workpiece drive assembly 50, causing the workpiece 60 to stop rotating. Finally, the clamps are released, the machined workpiece is removed, and a complete gantry mill machining cycle is completed.

[0037] The beneficial effects of the sectional knife machine of the present invention are as follows: The workpiece vibration stabilization assembly 40, through the coordinated operation of the drive cylinder 41, the first connecting member 42, the second connecting member 43, the damping member 44, the abutment joint 45, and the third connecting member 46, can precisely control the pressure between the abutment joint 45 and the workpiece 60. During processing, when a resonance tendency is detected in the workpiece, the pressure of the abutment joint 45 can be adjusted in real time according to the actual situation, thereby changing the vibration frequency of the workpiece 60. This precise control method ensures that the vibration frequency of the workpiece 60 always avoids the frequency range where resonance may occur between the tool assembly 30 and the workpiece 60, fundamentally preventing resonance from occurring. Because resonance is effectively avoided, the workpiece surface no longer exhibits textures caused by resonance, and the flatness and smoothness are significantly improved. For micro-parts in medical devices, the gantry mill 100 can ensure that the processed parts fully meet the high-precision design requirements, greatly improving the product qualification rate and quality stability. At the same time, the three-stage damping layer design also provides strong support for improving processing quality. The friction damping layers between the X-axis drive assembly 10 and the Z-axis drive assembly 20, the friction damping layer between the Z-axis drive assembly 20 and the tool assembly 30, and the friction damping layer between the tool holder 31 and the cutting tool 33 constitute a comprehensive vibration damping system. During the cutting process, this system effectively absorbs and dissipates the vibration energy generated by the cutting tool 33, reducing the transmission of vibration to the X-axis drive assembly 10 and the Z-axis drive assembly 20. This makes the cutting tool 33 more stable during machining, further ensuring the machining accuracy of the workpiece and improving machining quality. The three-stage vibration damping layer not only benefits machining quality but also plays a crucial protective role for the equipment. By reducing vibration transmission to the X-axis drive assembly 10 and the Z-axis drive assembly 20, it lowers the risk of wear and damage to these critical components due to long-term vibration impact, extending the equipment's service life and reducing the frequency and cost of maintenance.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0040] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gang tool, characterized in that, A cutting machine for cutting a workpiece (60) comprises: a cutter assembly (30) for cutting the workpiece (60); a workpiece driving assembly (50) for driving the workpiece (60) to rotate; a workpiece vibration damping assembly (40) comprising a driving cylinder (41), a first connecting member (42), a second connecting member (43), a damping member (44), an abutting head (45) and a third connecting member (46); an end of a first telescopic rod (411) of the driving cylinder (41) is fixedly connected to one end of the third connecting member (46); the first connecting member (42) is slidably sleeved on the first telescopic rod (411) of the driving cylinder (41), and the first connecting member (42) comprises first and second connecting arms (421, 422) arranged at an angle; end portions on both sides of the first connecting arm (421) are rotatably connected to the second connecting member (43); one end of the damping member (44) is rotatably connected to the second connecting member (43), and the other end of the damping member (44) is fixedly connected to the abutting head (45); one end of the third connecting member (46) is rotatably connected to a middle portion of the abutting head (45), and the other end of the third connecting member (46) is fixedly connected to the first telescopic rod (411), a micro pressure sensor is installed in the abutting head (45), and the abutting head (45) abuts against a surface of the workpiece (60).

2. The knife magazine of claim 1 wherein, The driving cylinder (41) comprises the first telescopic rod (411) and a first spring (412) sleeved on the first telescopic rod (411), and the first spring (412) is arranged between the first connecting member (42) and the third connecting member (46).

3. The knife magazine of claim 1 wherein, The workpiece vibration damping assembly (40) is fixed on the workpiece driving assembly (50), and the damping member (44) comprises a second telescopic rod (441) and a second spring (442) sleeved on the second telescopic rod (441).

4. The knife magazine of claim 1 wherein, The first connecting member (42) is "X"-shaped, the second connecting member (43) is "V"-shaped, and the first connecting member (42) and the second connecting member (43) have two rotatable connection points.

5. The knife magazine of claim 1 wherein, The cutter machine (100) further comprises a workbench (70), the workpiece driving assembly (50) comprises a connecting flange (54) and a fixing seat (55), a bottom end of the fixing seat (55) is fixed on the workbench (70), and a middle portion of the fixing seat (55) is clamped on the connecting flange (54).

6. A knife magazine according to claim 5, wherein, The fixing seat (55) is "L"-shaped, the fixing seat (55) is detachably installed on the connecting flange (54), and one end of the driving cylinder (41) is fixed on the fixing seat (55).

7. The knife magazine of claim 1 wherein, The cutter machine (100) further comprises an X-axis driving assembly (10) and a Z-axis driving assembly (20) for driving the cutter assembly (30) to move, the X-axis driving assembly (10) comprises a first mounting seat (14) and a first guide rail (15) installed in the first mounting seat (14), and a friction damping layer is arranged between the first mounting seat (14) and the first guide rail (15).

8. A knife magazine according to claim 7, characterised in that The Z-axis driving assembly (20) comprises a second guide rail (27), the tool assembly (30) comprises a tool holder (31), and a friction damping layer is arranged between the second guide rail (27) and the tool holder (31).

9. A knife magazine according to claim 8, wherein, The tool assembly (30) further comprises a row of tool seats (32) mounted on the tool holder (31), and a friction damping layer is arranged between the tool holder (31) and the row of tool seats (32).

10. The machine of claim 9 wherein, The friction damping layer is nitrile rubber.

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