Dynamic vibration absorption device and cutter system

Abstract

The invention belongs to the technical field of cutter cutting, and particularly relates to a dynamic vibration absorption device and a cutter system. The mass unit and the base assembly are arranged in a spaced mode in the axial direction of the vibration shaft; the mass unit comprises a plurality of beam components which are arranged at intervals in the circumferential direction of the vibration shaft, and the plurality of beam components are arranged on the base assembly and the mass unit in a penetrating mode; the damping unit is arranged on the side, away from the base assembly, of the mass unit, the damping unit comprises a clamping ring and a plurality of damping pieces, the damping pieces are arranged between the clamping ring and the mass unit, a first connecting line is formed between at least one damping piece and the axis of the vibration shaft, and a second connecting line is formed between at least another damping piece and the axis of the vibration shaft; the orthographic projections of the first connecting line and the second connecting line in a plane perpendicular to the axis of the vibration shaft are perpendicular to each other. According to the method, fluttering caused by the structural characteristics of a large-length-diameter-ratio structure in the machining process can be effectively restrained, and the machining precision and stability of a workpiece are improved.

Description

Technical Field

[0001] The present application relates to the technical field of tool cutting, and more specifically, to a dynamic vibration absorbing device and a tool system. Background Art

[0002] Cutting chatter is one of the biggest obstacles to improving tool processing accuracy and life, so it is of great practical significance to seek effective and reliable harmful vibration suppression technology. Among the many existing vibration suppression technologies, dynamic vibration absorption devices absorb and dissipate the vibration of the main vibration structure in the form of a secondary vibration subsystem. Compared with other vibration suppression methods (such as vibration isolation, energy-consuming vibration reduction, etc.), it has the advantages of simple structure and strong feasibility, so it is widely used in practical engineering problems.

[0003] In the process of mechanical processing, especially the processing of structural parts with deep holes and deep cavities, there are often large aspect ratio structures in the process system. However, the large aspect ratio structure makes its end rigidity weak. During milling, the tool and the workpiece are prone to harmful relative motion, which can cause serious chatter. Chatter will not only reduce the precision and surface quality of the parts and shorten the tool life, but also increase the processing cost, seriously affecting the processing efficiency and quality. Summary of the invention

[0004] The purpose of the present application is to provide a dynamic vibration absorption device and a tool system, which can effectively suppress the vibration caused by the large aspect ratio structural features in the process system during the processing due to their own structural characteristics, and improve the processing accuracy and stability of the workpiece.

[0005] In a first aspect, an embodiment of the present application provides a dynamic vibration absorbing device for being sleeved on the end of a vibration shaft, the dynamic vibration absorbing device comprising: a base assembly; a mass unit, which is spaced apart from the base assembly along the axial direction of the vibration shaft; a stiffness assembly, comprising a plurality of beam members spaced apart along the circumferential direction of the vibration shaft, the plurality of beam members passing through the base assembly and the mass unit; and a damping unit, which is arranged on the side of the mass unit away from the base assembly, the damping unit comprising a retaining ring and a plurality of damping members, the plurality of damping members being arranged between the retaining ring and the mass unit, a first connecting line being formed between at least one damping member and the axis of the vibration shaft, a second connecting line being formed between at least another damping member and the axis of the vibration shaft, and the orthographic projections of the first connecting line and the second connecting line in a plane perpendicular to the axis of the vibration shaft are perpendicular to each other.

[0006] In addition, the dynamic vibration absorbing device according to the present application may also have the following additional technical features:

[0007] In some embodiments of the present application, the clamping ring includes a first clamp and a second clamp that are arranged around the outer circumference of the vibration shaft and are connected to each other. The first clamp is provided with a first protrusion extending radially outward, and the second clamp is provided with a second protrusion extending radially outward. The first protrusion and the second protrusion are respectively fixedly connected to corresponding damping members.

[0008] In some embodiments of the present application, grooves are respectively provided on one side of the first convex portion and the second convex portion facing the mass unit, the length direction of the grooves is arranged parallel to the axis of the vibration shaft, and the damping member is embedded in the grooves and contacts the mass unit.

[0009] In some embodiments of the present application, the first clamp is provided with first positioning ears at both ends along its circumference, and the second clamp is provided with second positioning ears at both ends along its circumference, and the first positioning ears and the second positioning ears are connected by a first fastener.

[0010] In some embodiments of the present application, the base assembly includes a first clamping hoop and a second clamping hoop which are arranged around the outer circumference of the vibration shaft and are connected to each other. The first clamping hoop is provided with a first mounting portion extending radially outwardly along the first clamping hoop, and the second clamping hoop is provided with a second mounting portion extending radially outwardly along the first clamping hoop. The first mounting portion and the second mounting portion are respectively fixedly connected to one end of the beam component through a fastening assembly.

[0011] In some embodiments of the present application, the first clamping hoop is provided with third positioning ears at both ends along its circumference, and the second clamping hoop is provided with fourth positioning ears at both ends along its circumference, and the third positioning ear and the fourth positioning ear are connected by a second fastener.

[0012] In some embodiments of the present application, the mass unit is provided with a plurality of third mounting portions spaced apart along its circumference, and the third mounting portion is fixedly connected to one end of the beam member via a fastening assembly.

[0013] In some embodiments of the present application, the number of damping elements is four, and the four damping elements are centrally symmetrically arranged relative to the axis of the vibration shaft; and / or the number of beam components is four, and the four beam components are centrally symmetrically arranged relative to the axis of the vibration shaft.

[0014] In some embodiments of the present application, the mass unit is made of steel, the base assembly, the rigidity assembly and the clamping ring are all made of aluminum alloy, and the damping element is made of rubber or granular stone.

[0015] In a second aspect, an embodiment of the present application provides a tool system, comprising: a tool, comprising a tool handle and a tool head, wherein the axis of the tool head and the axis of the tool handle are arranged at a preset angle; and a power vibration absorption device of an embodiment of the present application, wherein the power vibration absorption device is sleeved on the outer periphery of the tool handle.

[0016] According to the power vibration absorption device and tool system provided in the embodiments of the present application, the power vibration absorption device is sleeved on the outer periphery of the tool handle, and the vibration energy of the tool handle is transferred to the mass unit through the damping unit, wherein at least two damping members of the damping unit have mutually orthogonal translational degrees of freedom, so as to suppress the vibration of the tool in two mutually orthogonal directions respectively, thereby effectively suppressing the chatter caused by the structural characteristics of the large aspect ratio structure in the process system during the machining process, thereby improving the machining accuracy and cutting stability of the workpiece.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0020] Figure 1 A schematic diagram of the structure of a tool system according to an embodiment of the present application;

[0021] Figure 2 for Figure 1 Schematic diagram of the simulation results of the modal vibration shape of the tool shown;

[0022] Figure 3 This is a schematic structural diagram of a dynamic vibration absorbing device according to an embodiment of the present application;

[0023] Figure 4 for Figure 3 The exploded structural diagram of the dynamic vibration absorbing device shown;

[0024] Figure 5 It is a schematic diagram of the simulation results of the main vibration mode of the dynamic vibration absorbing device of the embodiment of the present application;

[0025] Figure 6 for Figure 2 The schematic diagram of the frequency response function measurement result of the first measuring point of the tool shown;

[0026] Figure 7 for Figure 2 A schematic diagram of the frequency response function measurement result of the second measuring point of the tool shown;

[0027] Figure 8 To adopt Figure 1 The tool system shown is a comparison chart of the surface quality effects of cutting workpieces with and without the tool having an additional power vibration absorption device.

[0028] The reference numerals in the accompanying drawings represent the following:

[0029] 100. Dynamic vibration absorbing device;

[0030] 1. Base assembly; 11. First clamping hoop; 12. Second clamping hoop; 13. First mounting portion; 14. Second mounting portion; 15. Fastening assembly; 16. Third positioning ear; 17. Fourth positioning ear; 18. Second fastener;

[0031] 2. mass unit; 21. third mounting portion;

[0032] 3. Stiffness component; 31. Beam member;

[0033] 4. Damping unit; 41. Clamp; 411. First clamp; 412. Second clamp; 413. First protrusion; 414. Second protrusion; 415. First positioning ear; 416. Second positioning ear; 42. Damping member; 43. First fastener;

[0034] 200, tool; 210, tool handle; 220, tool head; a, first measuring point; b, second measuring point. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0036] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0038] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] Figure 1 is a schematic diagram of the structure of the tool system of an embodiment of the present application, Figure 2 for Figure 1 Schematic diagram of the mode vibration shape simulation results of the tool shown.

[0042] See also Figure 1 An embodiment of the present application provides a tool system, including a power vibration absorbing device 100 and a tool 200, wherein the tool 200 includes a tool handle 210 and a tool head 220, wherein the axis of the tool head 220 is arranged at a preset angle to the axis of the tool handle 210, and the power vibration absorbing device 100 is sleeved on the end of the tool handle 210.

[0043] In this embodiment, the tool 200 is an angular milling head (also known as an angle head), including a cutter head 220, a tool handle 210 and an internal transmission mechanism. The axis of the cutter head 220 and the axis of the tool handle 210 are arranged perpendicular to each other, and the tool handle 210 and the cutter head 220 rotate at a certain transmission ratio. Among them, the tool handle 210 has a large aspect ratio and is a weak link in rigidity in the process system. For example, the length of the tool handle 210 is 1200 mm, the diameter is 170 mm, and the aspect ratio is about 7. For workpieces with large aspect ratio structural features such as deep holes and deep cavities, it is easy to cause insufficient end rigidity, which in turn causes harmful relative movement between the tool 200 and the workpiece, causing serious chatter problems, which directly affects the processing quality, stability and safety of the workpiece.

[0044] To this end, the tool system of the embodiment of the present application is designed with a two-degree-of-freedom dynamic vibration absorption device 100 based on the spatial vibration characteristics of the tool 200, and the dynamic vibration absorption device 100 is mounted on the end of the tool handle 210. The dynamic modeling, numerical optimization, and structural design are then performed on it in sequence. Finally, the vibration suppression performance is verified through modal testing and cutting tests.

[0045] See also Figure 2 The embodiment of the present application performs a modal vibration mode simulation analysis on the tool 200, aiming to provide a basis for the arrangement of modal measurement points. The axial direction of the tool handle 210 is the Z axis, the plane perpendicular to the axial direction of the tool handle 210 is the XY plane, and the two directions perpendicular to each other in the XY plane are the X axis and the Y axis respectively. A fixed boundary condition is applied to one end of the tool handle 210, and the other end of the tool handle 210 is free, and the resulting vibration mode is solved.

[0046] In order to avoid vibration nodes, the layout of each modal measurement point is formulated and the global coordinate system is defined as follows: Figure 2 The first measuring point a is set at the connection between the power vibration absorbing device 100 and the tool handle 210, and is used to measure the dynamic characteristics of the tool handle 210 at the installation position of the power vibration absorbing device 100; the second measuring point b is set at the end of the cutter head 220, and is used to predict the stability of the cutting chatter, so as to further verify the effect of the power vibration absorbing device 100 on improving the cutting stability.

[0047] According to the simulation results (a) and (b), the first-order modal vibration shape of the tool is bending around its axis and along two orthogonal directions, X and Y. Since the cutting stability is jointly determined by the dynamic characteristics of the tool 200 in two orthogonal directions, the dynamic vibration absorbing device 100 should have two translational degrees of freedom to suppress the vibration in the X and Y directions respectively.

[0048] The specific structure of the dynamic vibration absorbing device 100 according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0049] Figure 3 is a schematic structural diagram of a dynamic vibration absorbing device according to an embodiment of the present application, Figure 4 for Figure 3 Schematic diagram of the exploded structure of the dynamic vibration absorbing device shown.

[0050] See also Figure 3 and Figure 4 An embodiment of the present application provides a dynamic vibration absorbing device 100, which is used to be sleeved on the end of a vibration shaft. The dynamic vibration absorbing device 100 includes a base component 1, a mass unit 2, a stiffness component 3 and a damping unit 4.

[0051] The mass unit 2 is spaced apart from the base assembly 1 along the axial direction of the vibration axis.

[0052] The stiffness assembly 3 includes a plurality of beam members 31 arranged at intervals along the circumferential direction of the vibration axis. The plurality of beam members 31 penetrate the base assembly 1 and the mass unit 2 .

[0053] The damping unit 4 is arranged on the side of the mass unit 2 away from the base assembly 1. The damping unit 4 includes a retaining ring 41 and a plurality of damping members 42. The plurality of damping members 42 are arranged between the retaining ring 41 and the mass unit 2. A first connecting line is formed between at least one damping member 42 and the axis of the vibration shaft, and a second connecting line is formed between at least another damping member 42 and the axis of the vibration shaft. The orthographic projections of the first connecting line and the second connecting line in a plane perpendicular to the axis of the vibration shaft are arranged perpendicular to each other.

[0054] In this embodiment, the vibration shaft can be the handle 210 of the tool 200, the axial direction of the vibration shaft is the Z axis, and the dynamic vibration absorbing device 100 is sleeved on the end of the handle 210. Specifically, the dynamic vibration absorbing device 100 includes a base assembly 1, a mass unit 2, a stiffness assembly 3 and a damping unit 4. The vibration shaft is a cylindrical shaft body. The base assembly 1, the mass unit 2 and the damping unit 4 are respectively annular components. The stiffness assembly 3 includes a plurality of beam components 31 arranged at intervals along the circumference of the vibration shaft. The cross section of the beam component 31 is rectangular. The number of the beam components 31 can be three or four. The plurality of beam components 31 are arranged through the base assembly 1 and the mass unit 2. The damping unit 4 is arranged on the side of the mass unit 2 away from the base assembly 1. The damping unit 4 includes a clamping ring 41 and a plurality of damping members 42. The plurality of damping members 42 are arranged between the clamping ring 41 and the mass unit 2. The plurality of damping members 42 can be at least two damping members 42, such as two damping members 42 or four damping members 42. A first connecting line is formed between at least one damping member 42 and the axis of the vibration axis, and a second connecting line is formed between at least another damping member 42 and the axis of the vibration axis, wherein the first connecting line or the second connecting line formed between the damping member 42 and the axis of the vibration axis refers to the first connecting line or the second connecting line formed between, for example, the center of mass position of the damping member 42 and the axis of the vibration axis, and the orthographic projections of the first connecting line and the second connecting line in a plane perpendicular to the axis of the vibration axis are arranged perpendicular to each other, so that at least two damping members 42 have mutually orthogonal translational degrees of freedom, namely, the translational degrees of freedom along the X-axis and the translational degrees of freedom along the Y-axis, respectively, so as to suppress the vibration of the tool 200 in the mutually orthogonal X direction and Y direction, respectively.

[0055] Since the dynamic vibration absorbing device 100 adopts a configuration with two translational degrees of freedom, it can accurately suppress the bending vibration modes of the tool 200 in two orthogonal directions. Compared with a single-degree-of-freedom vibration absorber, the cutting stability of the tool 200 can be significantly improved.

[0056] According to the dynamic vibration absorption device 100 provided in the embodiment of the present application, the vibration energy of the tool handle 210 is transferred to the mass unit 2 through the damping unit 4, wherein at least two damping members 42 of the damping unit 4 have mutually orthogonal translational degrees of freedom, so as to suppress the vibration of the tool 200 in two mutually orthogonal directions respectively, thereby effectively suppressing the flutter caused by the structural characteristics of the large aspect ratio structure in the process system during the machining process, thereby improving the machining accuracy and cutting stability of the workpiece.

[0057] In some embodiments, the clamping ring 41 includes a first clamping hoop 411 and a second clamping hoop 412 which are arranged around the outer periphery of the vibration shaft and are connected to each other. The first clamping hoop 411 is provided with a first protrusion 413 extending radially outwardly along itself, and the second clamping hoop 412 is provided with a second protrusion 414 extending radially outwardly along itself. The first protrusion 413 and the second protrusion 414 are respectively fixedly connected to the corresponding damping member 42.

[0058] like Figure 3 and Figure 4 As shown, the damping unit 4 is sleeved on the outer periphery of the vibration shaft and fixedly connected to the vibration shaft. In order to improve the clamping force between the damping unit 4 and the vibration shaft and facilitate the assembly of the damping unit 4 to the outer periphery of the vibration shaft, the clamping ring 41 of the damping unit 4 includes a first clamp 411 and a second clamp 412 which are arranged around the outer periphery of the vibration shaft and are connected to each other. The first clamp 411 and the second clamp 412 are arc-shaped components respectively. The inner walls of the first clamp 411 and the second clamp 412 are both semicircular, and the inner diameters are both adapted to the vibration shaft. The first clamp 411 is provided with a first convex portion 413 extending radially outwardly along itself, and the first convex portion 413 is arranged in the extension direction of the X axis. The second clamp 412 is provided with a second convex portion 414 extending radially outwardly along itself, and the second convex portion 414 is arranged in the extension direction of the Y axis. The first convex portion 413 and the second convex portion 414 are respectively fixedly connected to the corresponding damping member 42 to suppress the vibration of the tool 200 in the mutually orthogonal X direction and Y direction respectively.

[0059] Optionally, the first clamp 411 and the second clamp 412 are symmetrically arranged, and the number of the first protrusion 413 and the second protrusion 414 is equal, and can be one or two, so as to facilitate the processing and assembly of the damping unit 4. At the same time, a symmetrical damping force can be applied to the vibration axis, thereby reducing the possibility of the dynamic vibration absorption device 100 being offset relative to the vibration axis.

[0060] In some embodiments, grooves (not shown in the figure) are respectively provided on one side of the first protrusion 413 and the second protrusion 414 facing the mass unit 2 , and the length direction of the groove is parallel to the axis of the vibration shaft. The damping member 42 is embedded in the groove and contacts the mass unit 2 .

[0061] In this embodiment, the mass unit 2 is a circular ring structure, and the inner diameter of the mass unit 2 is smaller than the outer diameter of the groove, so that after the damping member 42 is embedded in the groove, it can contact with the mass unit 2 to generate a damping force, which can make the overall structure of the dynamic vibration absorbing device 100 compact and occupy a small space. In addition, the length direction of the groove is parallel to the axis of the vibration shaft, so that the damping force generated between the damping member 42 and the mass unit 2 can be applied to the vibration shaft as much as possible, thereby improving the vibration suppression effect.

[0062] In addition, by changing the depth of the groove or the height of the damping element 42, the axial displacement of the damping unit 4 along the vibration axis can be adjusted, thereby changing the contact pressure between the damping element 42 and the mass unit 2, thereby adjusting the magnitude of the damping force, achieving effective dissipation of vibration energy, and ensuring good vibration suppression performance under different processing conditions.

[0063] In some embodiments, the first clamp 411 is provided with first positioning ears 415 at both ends along its circumference, and the second clamp 412 is provided with second positioning ears 416 at both ends along its circumference. The first positioning ears 415 and the second positioning ears 416 are connected by a first fastener 43.

[0064] like Figure 3 and Figure 4 As shown, the two first positioning ears 415 of the first clamp 411 are respectively provided with first through holes, and the two second positioning ears 416 of the second clamp 412 are respectively provided with second through holes. The first fastener 43 includes bolts, nuts, washers, etc. The first fastener 43 is sequentially penetrated with the first through hole and the second through hole. By tightening the bolts and nuts, the vibration shaft can be clamped to reduce the possibility of the dynamic vibration absorbing device 100 being offset relative to the vibration shaft.

[0065] In some embodiments, the base assembly 1 includes a first clamping hoop 11 and a second clamping hoop 12 which are arranged around the outer circumference of the vibration shaft and are connected to each other. The first clamping hoop 11 is provided with a first mounting portion 13 extending radially outwardly thereof, and the second clamping hoop 12 is provided with a second mounting portion 14 extending radially outwardly thereof. The first mounting portion 13 and the second mounting portion 14 are respectively fixedly connected to one end of the beam member 31 via a fastening assembly 15.

[0066] like Figure 3 and Figure 4As shown, in order to improve the clamping force between the base assembly 1 and the vibration shaft and to facilitate the assembly of the base assembly 1 to the outer periphery of the vibration shaft, the base assembly 1 includes a first clamping hoop 11 and a second clamping hoop 12 that are arranged around the outer periphery of the vibration shaft and are connected to each other. The first clamping hoop 11 and the second clamping hoop 12 are arc-shaped components, respectively. The inner walls of the first clamping hoop 11 and the second clamping hoop 12 are both semicircular, and the inner diameters are both adapted to the vibration shaft. The first clamping hoop 11 is provided with a first mounting portion 13 extending radially outwardly thereof, and the second clamping hoop 12 is provided with a second mounting portion 14 extending radially outwardly thereof. The first mounting portion 13 and the second mounting portion 14 are fixedly connected to one end of the beam component 31 through a fastening assembly 15, respectively.

[0067] Optionally, the fastening assembly 15 includes a clamping piece, a bolt, a gasket, etc. The clamping piece clamps one end of the beam member 31 to the first mounting portion 13 or the second mounting portion 14. The first mounting portion 13 or the second mounting portion 14 is correspondingly provided with a threaded hole, and the gasket and the clamping piece are passed through the bolt and connected to the threaded hole to facilitate disassembly and assembly.

[0068] In some embodiments, the first clamping hoop 11 is provided with third positioning ears 16 at both ends along its circumference, and the second clamping hoop 12 is provided with fourth positioning ears 17 at both ends along its circumference. The third positioning ear 16 and the fourth positioning ear 17 are connected by a second fastener 18.

[0069] like Figure 3 and Figure 4 As shown, the two third positioning ears 16 of the first clamping hoop 11 are respectively provided with third through holes, the two fourth positioning ears 17 of the second clamping hoop 12 are respectively provided with fourth through holes, the second fastener 18 includes bolts, nuts, gaskets, etc., and the second fastener 18 is sequentially penetrated through the third through hole and the fourth through hole, and the vibration shaft can be clamped by tightening the bolts and nuts, thereby reducing the possibility of the dynamic vibration absorption device 100 being offset relative to the vibration shaft.

[0070] In some embodiments, the mass unit 2 is provided with a plurality of third mounting portions 21 at intervals along its circumference, and the third mounting portion 21 is fixedly connected to one end of the beam member 31 via a fastening assembly 15 .

[0071] like Figure 4 As shown, the mass unit 2 is a circular ring structure, and a plurality of third mounting portions 21 are arranged at intervals along the circumference of the mass unit 2 . The third mounting portion 21 is fixedly connected to one end of the beam member 31 through a fastening assembly 15 .

[0072] Optionally, the fastening assembly 15 includes a clamping piece, a bolt, a gasket, etc. The clamping piece is arranged in a "J" shape, and the clamping piece clamps the other end of the beam member 31 to the third mounting portion 21. The third mounting portion 21 is correspondingly provided with a threaded hole, and the gasket and the clamping piece are passed through the bolt and connected to the threaded hole to facilitate disassembly and assembly.

[0073] Since the fastening assembly 15 is easy to disassemble and assemble, the position of the mass unit 2 on the beam member 31 can be quickly adjusted. By moving the position of the mass unit 2 on the beam member 31, the equivalent suspension length of the beam member 31 can be changed to achieve continuous adjustment of the stiffness, thereby changing the stiffness and natural frequency of the dynamic vibration absorbing device 100 to adapt to the frequency adjustment requirements under different working conditions.

[0074] In some embodiments, there are four damping members 42, which are centrally symmetrically arranged relative to the axis of the vibration shaft; and / or, there are four beam components 31, which are centrally symmetrically arranged relative to the axis of the vibration shaft.

[0075] like Figure 4 As shown, the first clamp 411 is provided with two first protrusions 413, and the second clamp 412 is provided with two second protrusions 414, wherein one first protrusion 413 and one second protrusion 414 are arranged on the same straight line and parallel to the X axis, and the other first protrusion 413 and the other second protrusion 414 are arranged on the same straight line and parallel to the Y axis. In this way, a symmetrical damping force can be applied to the vibration axis, reducing the possibility of the dynamic vibration absorbing device 100 being offset relative to the vibration axis.

[0076] The number of the beam components 31 may be four, and the four beam components 31 are centrally symmetrically arranged with respect to the axis of the vibration shaft, and each beam component 31 is correspondingly arranged with a damping member 42, so that the vibration in the X direction or the Y direction can be effectively suppressed.

[0077] In some embodiments, the mass unit 2 is made of steel, the base assembly 1 , the rigidity assembly 3 and the clamping ring 41 are all made of aluminum alloy, and the damping member 42 is made of rubber or granular stone.

[0078] Optionally, the material of the mass unit 2 is 45# steel, the materials of the base component 1, the rigid component 3 and the clamping ring 41 are all aluminum alloy, and the material of the damping member 42 has a large friction coefficient, and may be, for example but not limited to, rubber or grain-containing stone. Since the density of the mass unit 2 is greater than the density of the base component 1, the rigid component 3 and the clamping ring 41, the mass unit 2 is less deformed under the action of natural gravity, and will not cause structural interference with other components.

[0079] Assuming that the effective suspension length of the shank 210 of the tool 200 is 150mm, the cross section of the beam component 31 is a square with a side length of 8mm, a dynamic model of the tool without the power vibration absorbing device 100 is established for finite element simulation analysis. Under the action of natural gravity, the maximum deformation displacement of the power vibration absorbing device 100 is 0.3mm, which can ensure that it does not interfere with the tool head 220 during the cutting process. At the same time, the maximum stress of the power vibration absorbing device 100 is located at the connection between the beam component 31 and the mass unit 2, and its stress value is 32MPa. Taking the safety factor as 3, the maximum stress is much lower than the allowable stress, which can ensure the structural reliability of the power vibration absorbing device 100 during operation.

[0080] Figure 5 Schematic diagram of the simulation results of the main vibration mode of the dynamic vibration absorbing device according to the embodiment of the present application.

[0081] like Figure 5 As shown, in order to verify the effectiveness of the structural design of the power vibration absorbing device 100, the embodiment of the present application established a dynamic model of the tool system of the tool-power vibration absorbing device based on the measured dynamic characteristics of the tool 200. On this basis, the optimal dynamic parameters of the power vibration absorbing device 100 were solved by numerical optimization, and it can be concluded that the optimal frequency of the target mode of the tool 200 is 34.77Hz. According to the vibration mode characteristics of the tool 200, the power vibration absorbing device 100 was designed by the spectrum method, and the prototype was subjected to finite element simulation analysis, and finally the modal test was carried out.

[0082] By changing the equivalent overhang of the beam member 31 by moving the position of the mass unit 2 on the beam member 31, the frequency tuning capability of the dynamic vibration absorbing device 100 can be simulated, and the results are shown in Table 1. When the effective overhang of the beam member 31 is 180 mm, the vibration frequency of the dynamic vibration absorbing device 100 is close to the optimal frequency of 37.2 Hz; when the effective overhang of the beam member 31 is the maximum value of 300 mm, the vibration frequency of the dynamic vibration absorbing device 100 reaches the minimum value of 17.6 Hz. When the equivalent overhang of the beam member 31 is reduced to 85 mm, the vibration frequency of the dynamic vibration absorbing device 100 increases to its maximum value of 107.9 Hz. It can be seen that the tuning range of the dynamic vibration absorbing device 100 can cover the optimal frequency of 34.77 Hz for suppressing the target mode of the tool 200.

[0083] Table 1

[0084]

[0085] Since the tool system with the power vibration absorbing device 100 attached has structural symmetry and the dynamic characteristics along the two orthogonal directions of X and Y are close, the embodiment of the present application only tests the origin frequency response function along the Y axis at the first measuring point a and the second measuring point b. The first measuring point a is set at the connection between the power vibration absorbing device 100 and the tool handle 210, and is used to measure the dynamic characteristics of the tool handle 210 at the installation position of the power vibration absorbing device 100; the second measuring point b is set at the end of the tool head 220, and is used to predict the stability of the cutting chatter, so as to further verify the effect of the power vibration absorbing device 100 on improving the cutting stability.

[0086] Figure 6 for Figure 2 The frequency response function measurement results of the first measuring point of the tool are shown in the figure. Figure 7 for Figure 2 The diagram shows the frequency response function measurement results of the second measuring point of the tool.

[0087] Based on the measurement results of the frequency response function, the stiffness and damping unit 4 of the dynamic vibration absorbing device 100 are continuously tuned until the parameters of the dynamic vibration absorbing device 100 are optimized. After the dynamic vibration absorbing device 100 is tuned to the optimal dynamic parameters, the measured frequency response function of the tool 200 is as follows: Figure 6 and Figure 7 shown.

[0088] like Figure 6 As shown in FIG. 1 , the peak values ​​of the frequency response function of the first measuring point a before and after the tool 200 is equipped with the power vibration absorbing device 100 are 4.81×10-6g / N and 3.01×10-6g / N, respectively, and the amplitude decreases by about 37.5%. Figure 7 As shown, the peak value of the frequency response function of the second measuring point b before the addition of the power vibration absorbing device 100 is 1.10×10-5g / N, while the peak value of the frequency response function after the addition of the power vibration absorbing device 100 is 2.92×10-6g / N, and the peak value is reduced by about 73.5%. It can be seen that the power vibration absorbing device 100 can effectively suppress the main vibration mode of the tool.

[0089] Figure 8 To adopt Figure 1 The shown diagram compares the surface quality effects of workpiece cutting by the tool system and the tool without the attached power vibration absorption device.

[0090] In order to verify the vibration suppression effect of the dynamic vibration absorption device 100, a cutting test was conducted on the workpiece. The workpiece is a rectangular blank made of aluminum alloy. Based on the frequency response functions in three orthogonal directions measured at the second measuring point b in the modal test, the zero-order frequency domain method was used to predict the vibration stability of the cutting process. The proposed working condition is slot milling. The material of the tool head 220 of the tool 200 is cemented carbide, the number of teeth is 2, the cutting path is fed along the Y-axis direction, and the feed amount per tooth is fz=0.11mm.

[0091] According to the above results, in order to observe the actual cutting vibration suppression effect of the dynamic vibration absorbing device 100, the test was carried out at a rotation speed of 600r / min and 1000r / min, and the selected cutting parameters are shown in Table 2. The workpiece surface obtained before and after the addition of the dynamic vibration absorbing device 100 is shown in Figure 8 Among them, cutting parameters #1, #2, and #3 respectively show the vibration marks on the surface of the workpiece cut before and after the power vibration absorbing device 100 is attached when the spindle speed of the tool holder 210 is 600r / min. It can be seen that the cutting depth increases from 0.5mm before attachment to 1.1mm after attachment, the vibration mark elimination effect is obvious, the stable cutting depth increases by 120%, and the chatter is effectively suppressed.

[0092] Similarly, cutting parameters #4, #5, and #6 respectively show the vibration marks on the surface of the workpiece before and after the addition of the dynamic vibration absorption device 100 when the spindle speed of the tool holder 210 is 1000 r / min. The cutting depth increases from 0.4 mm before the addition to 1.6 mm after the addition, the vibration mark elimination effect is more obvious, and the stable cutting depth increases by 300%.

[0093] Table 2

[0094]

[0095] Therefore, the tool system of the embodiment of the present application has the power vibration absorbing device 100 as described above added to the end of the tool handle 210 of the tool 200, and a dynamic model of the tool-power vibration absorbing device is established based on the measured dynamic characteristics of the tool system. On this basis, the optimal dynamic parameters of the vibration absorber are solved by carrying out numerical optimization. According to the vibration mode characteristics of the tool, the power vibration absorbing device 100 is configured and designed by the graph method, and the finite element simulation is carried out on the prototype. Finally, modal tests and cutting tests are carried out respectively to verify its effectiveness. The test results show that after adding the power vibration absorbing device 100, the peak value of the frequency response function at the end of the tool is reduced by 73.5%, and the stable cutting depth is significantly increased, which effectively suppresses chatter and improves the processing accuracy and stability of the workpiece.

[0096] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A dynamic vibration absorbing device, used to be sleeved on the end of a vibration shaft, characterized in that: The dynamic vibration absorbing device comprises: Base assembly; A mass unit is spaced apart from the base assembly along the axial direction of the vibration shaft; A rigidity component, comprising a plurality of beam components spaced apart along the circumference of the vibration axis, wherein the plurality of beam components penetrate the base component and the mass unit; and A damping unit is arranged on a side of the mass unit away from the base assembly, the damping unit includes a retaining ring and a plurality of damping members, the plurality of damping members are arranged between the retaining ring and the mass unit, a first connecting line is formed between at least one of the damping members and the axis of the vibration shaft, a second connecting line is formed between at least another of the damping members and the axis of the vibration shaft, and the orthographic projections of the first connecting line and the second connecting line in a plane perpendicular to the axis of the vibration shaft are arranged perpendicular to each other.

2. The dynamic vibration absorbing device according to claim 1, characterized in that: The clamping ring includes a first clamp and a second clamp which are arranged around the outer circumference of the vibration shaft and are connected to each other. The first clamp is provided with a first protrusion extending radially outward, and the second clamp is provided with a second protrusion extending radially outward. The first protrusion and the second protrusion are respectively fixedly connected to the corresponding damping member.

3. The dynamic vibration absorbing device according to claim 2, characterized in that: A groove is provided on one side of the first convex portion and the second convex portion facing the mass unit. The length direction of the groove is parallel to the axis of the vibration shaft. The damping member is embedded in the groove and contacts the mass unit.

4. The dynamic vibration absorbing device according to claim 2, characterized in that: The first clamp is provided with first positioning ears at both ends along its circumference, and the second clamp is provided with second positioning ears at both ends along its circumference. The first positioning ears and the second positioning ears are connected by a first fastener.

5. The dynamic vibration absorbing device according to claim 1, characterized in that: The base assembly includes a first clamping hoop and a second clamping hoop which are arranged to surround the outer circumference of the vibration shaft and are connected to each other. The first clamping hoop is provided with a first mounting portion extending radially outwardly thereof, and the second clamping hoop is provided with a second mounting portion extending radially outwardly thereof. The first mounting portion and the second mounting portion are respectively fixedly connected to one end of the beam component via a fastening assembly.

6. The dynamic vibration absorbing device according to claim 5, characterized in that: The first clamping hoop is provided with third positioning ears at both ends along its circumference, and the second clamping hoop is provided with fourth positioning ears at both ends along its circumference. The third positioning ear and the fourth positioning ear are connected by a second fastener.

7. The dynamic vibration absorbing device according to claim 1, characterized in that: The mass unit is provided with a plurality of third mounting portions at intervals along its circumference, and the third mounting portion is fixedly connected to one end of the beam component through a fastening assembly.

8. The dynamic vibration absorbing device according to any one of claims 1 to 7, characterized in that: The number of the damping members is four, and the four damping members are centrally symmetrically arranged relative to the axis of the vibration shaft; And / or, the number of the beam components is four, and the four beam components are centrally symmetrically arranged relative to the axis of the vibration shaft.

9. The dynamic vibration absorbing device according to claim 1, characterized in that: The material of the mass unit is steel, the material of the base component, the rigidity component and the clamping ring are all aluminum alloy, and the material of the damping member is rubber or granular stone.

10. A tool system, characterized in that: include: A tool, comprising a tool handle and a tool head, wherein the axis of the tool head is arranged at a preset angle with the axis of the tool handle; and The power vibration absorbing device according to any one of claims 1 to 9, wherein the power vibration absorbing device is sleeved on the end of the tool handle.

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