CN115213705A - Cutting mechanism for inhibiting cutting vibration - Google Patents

Cutting mechanism for inhibiting cutting vibration Download PDF

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Publication number
CN115213705A
CN115213705A CN202210800456.0A CN202210800456A CN115213705A CN 115213705 A CN115213705 A CN 115213705A CN 202210800456 A CN202210800456 A CN 202210800456A CN 115213705 A CN115213705 A CN 115213705A
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China
Prior art keywords
cutting
block
installation
damping
mounting
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Granted
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CN202210800456.0A
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Chinese (zh)
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CN115213705B (en
Inventor
高海宁
尹朋
李荣义
行舒乐
肖伟中
董雨晴
苑泗涛
张婉莹
余泽雄
尚文静
蒋志恒
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Huanghuai University
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Huanghuai University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0032Arrangements for preventing or isolating vibrations in parts of the machine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10Arrangements for cooling or lubricating tools or work

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention discloses a cutting mechanism for inhibiting cutting flutter, belonging to the technical field of grinding and cutting devices, comprising: the main part board, the mechanism that suppresses shakes is located on the main part board for the damping of cutting, wherein: the vibration suppression mechanism comprises a mounting part and a damper, and a damping hole is formed in one side of the outer surface of the main body plate. This restrain cutting mechanism that cutting shimmys, use through the mechanism that shakes that suppresses, absorb the slight quivering that the cutter produced at the in-process of cutting through the attenuator, reduce the vibration effect of cutting point, it is steady to guarantee the cutter in the use, the instability in the greatly reduced cutting process, improve the surface quality of processing work piece, and machining efficiency and machining precision, use through crop fixed establishment, can make the cutter fix on the installation piece, and the change of cutter is easier, can carry out the cutter change of different models according to the cutting demand of difference, it is easier to make it fix and change, work efficiency when improving the cutting.

Description

Cutting mechanism for inhibiting cutting vibration
Technical Field
The invention belongs to the technical field of grinding and cutting devices, and particularly relates to a cutting mechanism for inhibiting cutting chatter.
Background
Cutting chatter is a strong relative vibration generated among a machine tool, a workpiece and a cutter in a machining process, and is a complex dynamic instability phenomenon, and in the machining process, the cutting chatter not only affects the machining precision of the workpiece and reduces the machining efficiency, but also causes damage to machine tool parts and cutters, generates noise and pollutes the environment, and particularly in a high-speed and high-precision machining process, chatter has great harm and must be inhibited.
The passive control is a traditional machine tool cutting chatter control method, a method for restraining the cutting chatter by using an active or semi-active actuator is developed and formed in the last thirty years by means of modern control theory and the progress of a novel sensor and an advanced signal processing technology, and currently, research on the active and semi-active control technology of the cutting chatter at home and abroad has achieved a certain level.
In order to overcome the problem of chatter, the prior art uses a sensor to measure the vibration amplitude generated during cutting, adjusts the rotation speed of the spindle of the cutting mechanism by means of signal feedback, or adjusts the rotation speed of the spindle of the cutting mechanism in a manual operation manner, so as to achieve the effect of suppressing chatter of the object to be processed, but this type is active, and if the rotation speed of the spindle of the cutting mechanism is frequently adjusted during the cutting process, the surface roughness of the object to be processed and the precision of the object to be processed after processing cannot be ensured, and the installation of the cutter is inconvenient and is mainly fixed by bolts, so that the cutter replacement with different requirements is inconvenient during the use process, and simultaneously, the damping effect is not high, and the effectiveness and flexibility during the use process cannot be ensured.
Disclosure of Invention
The invention aims to: through the use of the mechanism that shakes of restraines, can absorb the slight quivering that the cutter produced at the in-process of cutting through the attenuator, reduce the vibration effect of cutting point, guarantee the steady of cutter in the use, the instability in the greatly reduced cutting process, improve the surface quality of processing work piece, and machining efficiency and machining precision, use through cutter change mechanism, can make the change of cutter more nimble, make the crop of different model sizes all can install, improve the comprehensive nature that the device used, use through crop fixed establishment, can make the cutter fix on the installation piece, and the change of cutter is easier, can carry out the cutter change of different models according to the cutting demand of difference, it is easier to make it fix and change, work efficiency when improving the cutting.
The technical scheme adopted by the invention is as follows: a cutting mechanism that suppresses cutting chatter, comprising:
a main body plate;
the vibration suppression mechanism is arranged on the main body plate and used for cutting vibration reduction, wherein: the vibration suppression mechanism comprises an installation part and a damper, wherein a damping hole is formed in one side of the outer surface of the main body plate, the installation part is arranged in the damping hole, and the damper is arranged in the installation part;
the cutter replacement mechanism is arranged in the main body plate and used for installing the cutting head, wherein: the head cutting replacing mechanism comprises a fixing part and an installation block, wherein an installation groove is formed in one side of the inner part of the main body plate, and the installation block is arranged in the installation groove; and
crop fixed establishment, it is equipped with three groups, three groups crop fixed establishment all locates in the installation piece for the installation of crop, wherein: crop fixed establishment includes driver part, spacing part, reset part, dead lever, carriage release lever, connecting rod and clamp splice, dead lever fixed connection is in inner wall one side of installation piece, the one end of carriage release lever is rotated and is connected in the dead lever, the one end of connecting rod is rotated and is connected on the carriage release lever, clamp splice fixed connection is in the other end of carriage release lever.
The installation component comprises a damping block and a buffer ring, the buffer ring is sleeved outside the damping block, the damping block is arranged in the damping hole, and the damper is arranged in the damping block.
Wherein, fixed part includes three fixing bolt, three fixed screw and three installation screw, and is three on the installation piece is seted up to installation screw equidistance, and is three on the main part board is seted up to fixed screw equidistance, every fixing bolt all inserts and locates in every installation screw, and every fixing bolt is equal threaded connection in every fixing bolt.
The driving part comprises a fixed cylinder and a driving block, the fixed cylinder is fixedly connected to the center of one side of the inner wall of the mounting block, the driving block is fixedly connected to the output end of the fixed cylinder, and one end of the connecting rod is rotatably connected to the driving block.
The limiting part comprises a limiting block and a sliding block, the limiting block is fixedly connected to one side in the mounting block, a sliding groove is formed in the limiting block, the sliding block is fixedly connected to the bottom of the clamping block, and the sliding block is connected into the sliding groove in a sliding mode.
The reset component comprises a reset spring and a damping telescopic rod, one end of the reset spring is fixedly connected to the moving rod, the other end of the reset spring is fixedly connected to the mounting block, one end of the damping telescopic rod is fixedly connected to the moving rod, and the other end of the damping telescopic rod is fixedly connected to the mounting block.
The utility model discloses a clamping piece, including installation piece, clamping piece, hook groove, clamping piece, mounting piece, wherein, the internally mounted of installation piece is provided with the tool bit, the hook groove has been seted up to the one end of tool bit, and is a plurality of the equal joint of clamping piece sets up in the hook groove.
A plurality of clamping grooves are formed in one side of the mounting block, a plurality of clamping blocks are fixedly intercepted on the outer surface of the cutter head, and each clamping block is clamped in each clamping groove.
Wherein, the cold air flue has been seted up to the inside of main part board, the cold air flue extends and sets up in the mounting groove, the cold air flue parcel sets up in the surface of installation piece.
Wherein, the inside fixedly connected with kicking block of installation piece.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) In the invention, by using the vibration suppression mechanism, the fine vibration generated in the cutting process of the cutter can be absorbed by the damper, so that the vibration effect of a cutting point is reduced, the stability of the cutter in the using process is ensured, the instability in the cutting process is greatly reduced, and the surface quality, the processing efficiency and the processing precision of a processed workpiece are improved.
(2) According to the invention, through the use of the cutter replacing mechanism, the cutter can be replaced more flexibly, so that the cutting heads of different types and sizes can be mounted, and the use comprehensiveness of the device is improved.
(3) According to the invention, the cutter can be fixed on the mounting block by using the head cutting fixing mechanism, the cutter can be replaced more easily, the cutters of different types can be replaced according to different cutting requirements, the cutter can be fixed and replaced more easily, and the working efficiency during cutting is improved.
Drawings
FIG. 1 is an exploded cross-sectional view of the present invention;
FIG. 2 is a perspective view of the crop fixation mechanism of the present invention;
FIG. 3 is a first perspective view of the present invention;
FIG. 4 is a perspective view from a second perspective of the present invention;
FIG. 5 is a half sectional view of the present invention;
fig. 6 is a partial cross-sectional view of the cutter changing mechanism of the present invention.
The labels in the figure are: 1. a main body plate; 2. a cold gas duct; 3. a damper; 4. a damping block; 5. a buffer ring; 6. a clamping block; 7. a cutter head; 8. mounting blocks; 9. a travel bar; 10. a connecting rod; 11. fixing the air cylinder; 12. fixing the bolt; 13. fixing screw holes; 14. mounting grooves; 15. a slider; 16. a clamping block; 17. a hook groove; 18. fixing the rod; 19. a top block; 20. a chute; 21. a limiting block; 22. a return spring; 23. damping telescopic rods; 24. mounting a screw hole; 25. a damping hole; 26. a drive block; 27. a clamping groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and are not intended to limit the invention.
Example one, with reference to fig. 1-6: a cutting mechanism that suppresses cutting chatter, comprising:
a main body plate 1;
the vibration suppression mechanism is arranged on the main body plate 1 and used for cutting vibration reduction, wherein: the vibration suppression mechanism comprises a mounting part and a damper 3, wherein a damping hole 25 is formed in one side of the outer surface of the main body plate 1, the mounting part is arranged in the damping hole 25, and the damper 3 is arranged in the mounting part;
the cutter change mechanism is located in main part board 1 for the installation of crop, wherein: the crop replacement mechanism comprises a fixed part and an installation block 8, wherein an installation groove 14 is formed in one side of the interior of the main body plate 1, and the installation block 8 is arranged in the installation groove 14; and
crop fixed establishment, it is equipped with three groups, and three groups crop fixed establishment all locate in installation piece 8 for the installation of crop, wherein: crop fixed establishment includes drive assembly, spacing part, reset block, dead lever 18, carriage release lever 9, connecting rod 10 and clamp splice 16, and dead lever 18 fixed connection is in the inner wall one side of installing block 8, and the one end of carriage release lever 9 rotates and connects in dead lever 18, and the one end of connecting rod 10 rotates and connects on carriage release lever 9, and clamp splice 16 fixed connection is in the other end of carriage release lever 9.
In this embodiment: device fixed connection that main part board 1 and cutting used, guarantee to use, attenuator 3 belongs to current restraint, it has on the market can be selected as required to its model, it is not redundantly repeated here, the size of damping hole 25 is slightly bigger than the size of installing component, when can making the cutting use, attenuator 3's use is more effective, installation piece 8 can just inlay through mounting groove 14 and establish in main part board 1, guarantee fixed the use, and establish in installation piece 8 by crop fixed establishment, and three crop fixed establishment of group present triangle-shaped, can make fixed more stable, dead lever 18 is used for the basis of dragging, angle change through connecting rod 10, pull removal pole 9 and remove, thereby control clamp splice 16 is to the centre gripping of cutter, make things convenient for the change of cutter, improve holistic.
Specifically, the mounting component comprises a damping block 4 and a buffering ring 5, the buffering ring 5 is sleeved outside the damping block 4, the damping block 4 is arranged in a damping hole 25, and the damper 3 is arranged in the damping block 4.
In this embodiment: install damping piece 4 in damping hole 25 through buffer ring 5, make main body board 1 during operation, the attenuator 3 in the damping piece 4 can absorb the flutter effectively, guarantees main body board 1's stable use, improves holistic cutting quality.
Specifically, the fixing part includes three fixing bolt 12, three fixed screw 13 and three installation screw 24, and three installation screw 24 equidistance is seted up on installation piece 8, and three fixed screw 13 equidistance is seted up on main part board 1, and every fixing bolt 12 all inserts and locates in every installation screw 24, and every fixing bolt 12 equal threaded connection is in every fixed screw 13.
In this embodiment: each fixing bolt 12 is inserted into the mounting screw hole 24 of the mounting block 8 and connected to the fixing screw hole 13, so that the mounting block 8 is fixed inside the mounting groove 14 in the main body plate 1, and three kinds of devices of the fixing member each have a triangular shape, so that the mounting is more stable.
Specifically, the driving part comprises a fixed cylinder 11 and a driving block 26, the fixed cylinder 11 is fixedly connected to the center of one side of the inner wall of the mounting block 8, the driving block 26 is fixedly connected to the output end of the fixed cylinder 11, and one end of the connecting rod 10 is rotatably connected to the driving block 26.
In this embodiment: the type of the fixed cylinder 11 can be selected from the existing types on the market according to the needs, and the description is omitted, and the position of the driving block 26 is controlled by the fixed cylinder 11, so that the driving block 26 pulls the connecting rod 10 to adjust the angle, and the connecting rod 10 pulls the moving rod 9 to act.
Specifically, the limiting part comprises a limiting block 21 and a sliding block 15, the limiting block 21 is fixedly connected to one side of the mounting block 8, a sliding groove 20 is formed in the limiting block 21, the sliding block 15 is fixedly connected to the bottom of the clamping block 16, and the sliding block 15 is slidably connected to the sliding groove 20.
In this embodiment: the limiting blocks 21 correspond to the positions of the three clamping blocks 16 respectively, and the sliding grooves 20 on the limiting blocks are matched with the sliding blocks 15 on the clamping blocks 16, so that the position of the moving rod 9 in the moving process is ensured not to be deviated.
Specifically, reset unit includes reset spring 22 and damping telescopic link 23, and reset spring 22's one end fixed connection is on carriage release lever 9, and reset spring 22's the other end fixed connection on installation piece 8, and damping telescopic link 23's one end fixed connection is on carriage release lever 9, and damping telescopic link 23's the other end fixed connection on installation piece 8.
In this embodiment: damping telescopic link 23 can absorb reset spring 22's bounce, can guarantee the stability in the use, and the model of damping telescopic link 23 can select to have on the market as required simultaneously, and not redundantly repeated here, and the two carries out corresponding change according to the position adjustment of carriage release lever 9, guarantees to use.
Specifically, the internally mounted of installation piece 8 is provided with tool bit 7, and hook groove 17 has been seted up to tool bit 7's one end, and the equal joint of a plurality of clamp splice 16 sets up in hook groove 17.
In this embodiment: the cutter head 7 is divided into two sections, the first section is a cutting part, the second section is an installation part, the installation part corresponds to the installation block 8, and a hook groove 17 of the installation part corresponds to the clamping block 16, so that the cutter head 7 is fixed on the installation block 8 by the cutter head fixing mechanism.
Specifically, a plurality of draw-in grooves 27 have been seted up to one side of installation piece 8, and the external surface mounting interception of tool bit 7 has a plurality of fixture blocks 6, and every fixture block 6 all is blocked and is set up in every draw-in groove 27.
In this embodiment: the clamping groove 27 corresponds to the clamping block 6, so that the cutter head 7 is kept fixed in the rotating direction and is matched with the clamping block 16, and the cutter head 7 is integrally fixed.
Specifically, cold air flue 2 has been seted up to main part board 1's inside, and cold air flue 2 extends and sets up in mounting groove 14, and cold air flue 2 parcel sets up in the surface of installation piece 8.
In this embodiment: the cold air duct 2 is arranged on the main body plate 1, the temperature of the mounting block 8 is kept, the temperature of the cutter head 7 is stabilized in a proper range in the using process, and the influence of overhigh temperature on the cutter head 7 is avoided.
Specifically, the inside of the mounting block 8 is fixedly connected with a top block 19.
In this embodiment: the top block 19 may define the position of the cutting head 7, keeping the cutting head 7 mounted.
When the cutting tool is used, the main body plate 1 is installed on equipment, an appropriate installation block 8 is selected to be installed in an installation groove 14 of the main body plate 1 according to cutting requirements, a fixing bolt 12 is inserted into an installation screw hole 24 and connected into a fixing screw hole 13 on the main body plate 1, the installation block 8 is fixed in the installation groove 14, a proper tool bit 7 is selected, a clamping block 6 on the tool bit 7 corresponds to a clamping groove 27 on the installation block 8, the tool bit 7 is inserted into the installation block 8 and is made to contact with an ejector block 19 to be kept stable, a fixing cylinder 11 contracts, a driving block 26 controls a connecting rod 10 to adjust the angle, a moving rod 9 rotates on a fixing rod 18 to control the position of a clamping block 16, when the position of the clamping block 16 is adjusted, a sliding block 15 on the clamping block 16 slides in a sliding groove 20 on a limiting block 21, the one end position of restriction clamp splice 16, simultaneously, use by reset spring 22 and damping telescopic link 23 cooperation jointly, keep the position of carriage release lever 9, position deviation when avoiding tool bit 7 to fix, in the use, carry out the pouring of air conditioning through cold air flue 2, keep tool bit 7 and installation piece 8 and its inside temperature, in the use, tool bit 7 produces the vibration, carry out the absorption of flutter through damping piece 4 and attenuator 3 in damping hole 25, keep the stability of tool bit 7, cushion by buffer ring 5, keep the use of attenuator 3 and damping piece 4, when the model of tool bit 7 needs to be changed, through the extension of fixed cylinder 11, adjust the position of clamp splice 16, make tool bit 7 break away from the installation of installation piece 8, it can to take out the installation once more after the change.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A cutting mechanism that suppresses cutting chatter, comprising:
a main body plate (1);
the vibration suppression mechanism is arranged on the main body plate (1) and used for cutting vibration reduction, wherein: the vibration suppression mechanism comprises an installation part and a damper (3), a damping hole (25) is formed in one side of the outer surface of the main body plate (1), the installation part is arranged in the damping hole (25), and the damper (3) is arranged in the installation part;
the mechanism is changed to the cutter, locates in main part board (1) for the installation of crop, wherein: the crop head replacement mechanism comprises a fixed part and an installation block (8), wherein an installation groove (14) is formed in one side of the interior of the main body plate (1), and the installation block (8) is arranged in the installation groove (14); and
crop fixed establishment, it is equipped with three groups, three groups crop fixed establishment all locates in installation piece (8) for the installation of crop, wherein: crop fixed establishment includes driver part, spacing part, reset unit, dead lever (18), carriage release lever (9), connecting rod (10) and clamp splice (16), dead lever (18) fixed connection is in the inner wall one side of installation piece (8), the one end of carriage release lever (9) is rotated and is connected in dead lever (18), the one end of connecting rod (10) is rotated and is connected on carriage release lever (9), clamp splice (16) fixed connection is in the other end of carriage release lever (9).
2. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 1, wherein the mounting member comprises a damping block (4) and a buffering ring (5), the buffering ring (5) is sleeved outside the damping block (4), the damping block (4) is mounted in a damping hole (25), and the damper (3) is mounted in the damping block (4).
3. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 2, wherein said fixing means comprises three fixing bolts (12), three fixing screw holes (13) and three mounting screw holes (24), three said mounting screw holes (24) are provided equidistantly on the mounting block (8), three said fixing screw holes (13) are provided equidistantly on the main body plate (1), each of said fixing bolts (12) is inserted into each of said mounting screw holes (24), and each of said fixing bolts (12) is screwed into each of said fixing screw holes (13).
4. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 3, wherein said driving means comprises a fixed cylinder (11) and a driving block (26), said fixed cylinder (11) is fixedly connected to a center of one side of the inner wall of the mounting block (8), said driving block (26) is fixedly connected to an output end of the fixed cylinder (11), and one end of said connecting rod (10) is rotatably connected to the driving block (26).
5. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 4, wherein the limiting member comprises a limiting block (21) and a sliding block (15), the limiting block (21) is fixedly connected to one side of the mounting block (8), a sliding groove (20) is formed in the limiting block (21), the sliding block (15) is fixedly connected to the bottom of the clamping block (16), and the sliding block (15) is slidably connected to the sliding groove (20).
6. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 5, wherein the reset component comprises a reset spring (22) and a damping telescopic rod (23), one end of the reset spring (22) is fixedly connected to the moving rod (9), the other end of the reset spring (22) is fixedly connected to the mounting block (8), one end of the damping telescopic rod (23) is fixedly connected to the moving rod (9), and the other end of the damping telescopic rod (23) is fixedly connected to the mounting block (8).
7. The cutting mechanism for inhibiting cutting chatter vibration as claimed in claim 6, wherein a tool bit (7) is installed inside the mounting block (8), a hook groove (17) is formed in one end of the tool bit (7), and the clamping blocks (16) are clamped and arranged in the hook groove (17).
8. The cutting mechanism for suppressing cutting chatter vibration as claimed in claim 7, wherein a plurality of clamping grooves (27) are formed in one side of the mounting block (8), a plurality of clamping blocks (6) are fixedly intercepted on the outer surface of the cutter head (7), and each clamping block (6) is clamped and arranged in each clamping groove (27).
9. The cutting mechanism for suppressing cutting chatter vibration of claim 8, wherein a cold air channel (2) is formed in the main body plate (1), the cold air channel (2) extends to the mounting groove (14), and the cold air channel (2) is wrapped on the outer surface of the mounting block (8).
10. A cutting mechanism for suppressing cutting chatter as claimed in claim 9, wherein a top block (19) is fixedly attached to an inside of the mounting block (8).
CN202210800456.0A 2022-07-08 2022-07-08 Cutting mechanism for inhibiting cutting chatter Active CN115213705B (en)

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CN115213705B CN115213705B (en) 2024-06-04

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