A lightweight vibration-damping turning tool bar

Abstract

The invention discloses a lightweight vibration-damping lathe tool bar, which belongs to the technical field of machine tool tools. The lathe tool bar of the invention comprises a tool body, a plurality of cavities are provided on the tool body along the length direction, and the tool body between adjacent cavities has a BCC lattice structure; a closed magnetic pole device comprises a plurality of magnetic pole pieces respectively located on the bottom and side walls of the cavity; a pendulum-type vibration absorber is placed inside the closed magnetic pole device formed by the plurality of magnetic pole pieces, and magnetic pole patches corresponding to each magnetic pole piece are respectively provided on the outer surface of the pendulum-type vibration absorber, and the magnetic pole patches have the same polarity on the side opposite to each magnetic pole piece, so that the magnetic force of each magnetic pole piece and the corresponding magnetic pole patch repel each other. While ensuring the rigidity, the invention reduces the weight of the tool bar, weakens the influence of the cutting vibration caused by the long overhang of the tool bar, and realizes vibration transfer by relying on the pendulum-type vibration absorber structure, thereby suppressing chatter, improving processing stability, and ensuring processing accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool cutting tools, and in particular to a lightweight vibration-damping turning tool bar. Background Art

[0002] In the fields of aerospace, automobile manufacturing, etc., the structure of parts is becoming more and more complex, and the requirements for the processing quality and precision of key parts are becoming higher and higher, making it difficult for the original processing technology and equipment to meet the requirements. One of the important reasons is cutting vibration. When the cutting process vibrates, the tool will leave vibration marks on the surface of the workpiece, seriously affecting the processing quality of the workpiece. At the same time, the tool-machine tool process system will be subjected to the effect of vibration load, the tool is prone to wear or chipping, and the machine tool is also damaged to a certain extent.

[0003] For this purpose, related technologies capable of reducing tool chatter during turning processing have also been proposed in the prior art. For example, the invention patent with patent number CN106994519B discloses a viscoelastic constrained damping structure vibration-damping tool rod, which reduces the problem of tool chatter during turning. It mainly adopts a damping adhesive layer formed by a damping adhesive on the substrate of the tool rod to bond a viscoelastic damping layer, and a constrained layer is bonded on the viscoelastic damping layer to form a constrained damping structure; the vibration energy generated at the tool head during the turning process is transmitted from the substrate to the constrained damping structure, and the viscoelastic damping layer in the constrained damping structure converts the vibration energy into heat energy dissipation through shear energy consumption to achieve the suppression of turning chatter. For example, the invention patent with patent number CN108356301A discloses a scattering-type periodic structure damping and vibration-reducing turning tool rod, which also solves the problem of turning tool chatter in turning processing to a certain extent. It mainly adopts a tool body and a tool head connected as one body, and the outer peripheral surface of the tool body is evenly and periodically distributed with multiple rows and columns of damping scatterers, and the tool body and the damping scatterer form a scattering-type periodic structure; during the turning process, the vibration energy generated at the tool head is transmitted from the tool body to the damping scatterer, and the damping scatterer is used to suppress the elastic waves in the bandgap range, thereby converting the vibration energy into heat energy dissipation to achieve the suppression of turning chatter.

[0004] However, in the above two types of vibration-damping turning tool rods in the prior art, the energy generated by the vibration is still retained in the tool body and slowly dissipated through the tool body itself. However, the vibration energy is continuous during turning processing, and the conventional tool body structure is difficult to cope with the continuously generated vibration energy, so wear or chipping problems are prone to occur. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and provide a lightweight vibration-damping turning tool bar, which reduces the weight of the tool bar while ensuring rigidity, weakens the influence of cutting vibration caused by the long overhang of the tool bar, and relies on a closed magnetic pole device and a pendulum-type vibration absorber structure to achieve vibration transfer and dissipation, so as to avoid the vibration energy continuously generated during turning being retained in the tool body, causing the problem of tool bar wear or chipping.

[0006] The invention discloses a lightweight vibration-damping turning tool bar, comprising a tool body, a plurality of cavities are provided along the length direction, and the tool body between adjacent cavities has a BCC lattice structure;

[0007] A closed pole piece, comprising a plurality of pole pieces respectively located on the bottom and side walls of the cavity;

[0008] The pendulum-type vibration absorber is placed inside the closed magnetic pole device formed by the plurality of magnetic pole pieces. The outer surface of the pendulum-type vibration absorber is provided with magnetic pole patches corresponding to each magnetic pole piece one by one. The magnetic pole patches are arranged opposite to the side of each magnetic pole piece with the same polarity so that each magnetic pole piece and the corresponding magnetic pole patch repel each other magnetically.

[0009] Preferably, the pendulum vibration absorber comprises:

[0010] A limiting fixing member is placed on the top of the cavity and is fixedly connected to the knife body;

[0011] The damper has a through hole extending vertically through the middle, and slots are arranged on the periphery and bottom of the damper; and each magnetic pole patch is fixedly connected to each slot of the damper;

[0012] The spring is placed in the through hole of the damper, with its lower end fixed to the upper surface of the magnetic pole patch at the bottom of the damper and its upper end fixed to the lower surface of the limit fixing member.

[0013] Preferably, the limit fixing member includes a limit cover body and legs connected to the limit cover body, the ends of each magnetic pole piece located on the side wall of the cavity form a longitudinal narrow channel with the inner wall of the cavity, and each leg of the limit fixing member is arranged in the longitudinal narrow channel. The upper surface of the limit cover body is flush with the upper surface of the knife body and is fixedly connected to the knife body.

[0014] Preferably, the cavity is a rectangular cavity, and the multiple pole pieces include rectangular pole pieces and square pole pieces, and the square pole pieces are fixedly connected to the bottom of the cavity; the rectangular pole pieces are fixedly connected to the four sides of the cavity, and the S poles of each rectangular pole piece and square pole piece are facing the center of the cavity.

[0015] Preferably, the four corners of the cavity and the rectangular pole pieces on two adjacent side walls at each corner together form four longitudinal narrow channels, and there are four legs, which are respectively arranged in the four longitudinal narrow channels in a one-to-one correspondence.

[0016] Preferably, the blade body includes a blade body frame, the wall thickness of the blade body frame is 1.5mm-3mm, the wall thickness of each cavity is 1mm-2mm, the bottom thickness of the cavity is 3mm-5mm, and the space between the blade body frame and each cavity is a BCC lattice structure.

[0017] Preferably, the multiple cavities are evenly arranged.

[0018] Preferably, the cutter body is processed by 3D printing.

[0019] Preferably, a cemented carbide blade is installed on the top of the cutter body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, since the interior of the tool body is designed as a BCC lattice structure, the weight of the tool bar can be reduced by 61.7%. In the long overhang state, the internal BCC topological structure has a lighter weight and good energy absorption capacity, thereby reducing vibration during cutting.

[0022] The present invention designs a pendulum vibration absorber and a closed magnetic pole device. During cutting processing, the vibration energy generated by the tool rod is first consumed by the BCC lattice structure. Secondly, the residual vibration energy of the tool body with the BCC lattice structure is transferred through the principle of magnetic repulsion of the same poles of the pendulum vibration absorber and the closed magnetic pole device. The residual energy in the tool body with the BCC lattice structure is transferred to the pendulum vibration absorber, and the residual vibration energy is dissipated by the swing of the pendulum vibration absorber.

[0023] With the support of the BCC lattice structure, closed magnetic pole piece and pendulum vibration absorber, the tool body of the present invention can quickly dissipate the vibration energy continuously generated in the turning process through the mode of consumption-transfer-re-consumption, thereby reducing the problem of tool rod wear or chipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the internal structure of the blade body at AA according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the structure of the blade body according to an embodiment of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the blade body BB according to an embodiment of the present invention.

[0028] Figure 5 2 is a front view of a pendulum vibration absorber according to an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the pendulum vibration absorber at CC according to an embodiment of the present invention.

[0030] Figure 7 Schematic diagram of the overall structure of the pendulum type vibration absorber according to an embodiment of the present invention.

[0031] Figure 8 It is an exploded view of the pendulum vibration absorber structure according to an embodiment of the present invention.

[0032] Fig. 9 It is a two-dimensional schematic diagram of the damper structure of an embodiment of the present invention.

[0033] Fig.10 The present invention Fig. 9 2D schematic diagram of the damper structure and cross-section at DD.

[0034] Fig.11 The present invention Fig. 9 2D schematic diagram of the damper structure and cross-section at EE.

[0035] Fig.12 Schematic diagram of the structure of the damper according to the embodiment of the present invention.

[0036] Fig.13 It is a schematic structural diagram of a built-in pendulum vibration absorber of a closed magnetic pole machine according to an embodiment of the present invention.

[0037] Fig.14 The present invention Fig.13 Schematic diagram of the structure at FF.

[0038] Fig.15 It is a three-dimensional structural schematic diagram of a built-in pendulum-type vibration absorber of a closed magnetic pole machine of the present invention.

[0039] Fig.16 It is a schematic diagram of the magnetic field strength in a closed magnetic pole device according to an embodiment of the present invention.

[0040] Fig.17 1 is a schematic diagram of a two-degree-of-freedom system according to an embodiment of the present invention.

[0041] Fig.18 It is a structural diagram of a physical tool body for simulation test provided by an embodiment of the present invention.

[0042] Fig.19 It is a structural diagram of a tool body with a BCC structure for simulation test provided in an embodiment of the present invention.

[0043] Fig. 20 It is a structural diagram of a cutter body with a pendulum-type vibration absorber for simulation test provided in an embodiment of the present invention.

[0044] Fig.21 The present invention Fig. 20 Schematic diagram of the structure at GG in the figure.

[0045] Fig. 22 yes Figure 18-Figure 20 Comparison chart of the modal analysis vibration frequencies of the three types of tool bodies.

[0046] Fig.23 yes Fig.18 Transient excitation vibration deformation waveform of the solid tool body.

[0047] Fig.24 yes Fig. 20 Transient excitation vibration deformation waveform of the tool body with pendulum vibration absorber.

[0048] Fig.25 yes Fig.19 Transient excitation vibration deformation waveform of the BCC tool body.

[0049] Fig.26 4 is a vibration deformation waveform diagram of the pendulum vibration absorber according to an embodiment of the present invention.

[0050] Fig. 27 Schematic diagram of the BCC lattice structure of an embodiment of the present invention.

[0051] Fig.28 It is a schematic diagram of the arrangement of the local lattice structure of an embodiment of the present invention.

[0052] Description of reference numerals:

[0053] 1. Cutter body, 2. Pendulum vibration absorber, 21. Limit fixing, 22. Spring, 23. Damper, 24. Pole patch, 3. Closed pole piece, 31. Rectangular pole piece, 32. Square pole piece, 4. Carbide blade, 5. Cavity, 6. BCC crystal structure. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0055] Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The embodiment provides a lightweight vibration-damping turning tool bar, comprising a tool body 1 and a carbide blade 4 fixed at the end of the tool body 1. The tool body 1 provided in the embodiment is provided with a plurality of cavities 5 along the length direction. The tool body 1 between adjacent cavities 5 has a BCC lattice structure. Each cavity 5 is provided with a closed magnetic pole device 3 and a pendulum-type vibration damper 2. The closed magnetic pole device 3 comprises a plurality of magnetic pole pieces respectively located at the bottom and side walls of the cavity 5. The S pole of each magnetic pole piece is oriented toward the center of the cavity 5 or the N pole is oriented toward the center of the cavity 5. The pendulum-type vibration damper 2 is placed in the closed magnetic pole device 3 formed by the plurality of magnetic pole pieces. Part, the outer side of the pendulum vibration absorber 2 is respectively provided with a pole patch 24 corresponding to each pole piece, and the side of the pole patch 24 with the same polarity as each pole piece is facing each pole piece, so that each pole piece and the corresponding pole patch 24 magnetically repel each other. Specifically, when the S pole of each pole piece is facing the center of the cavity 5, the S pole of each pole patch 24 is facing each pole piece; similarly, when the N pole of each pole piece is facing the center of the cavity 5, the N pole of each pole patch 24 is facing each pole piece, as long as the two relatively designed pole patches 24 and pole pieces meet the same-pole repulsion.

[0057] As a preferred embodiment, the pendulum vibration absorber 2 of this embodiment includes a limit fixing 21, a spring 22 and a damper 23, wherein the limit fixing 21 is placed at the upper opening at the top of the cavity 5 and is fixedly connected to the blade body 1, and the limit fixing 21 is mainly used to limit the damper 23 from swinging out of the cavity 5, and is also used to compensate for the stiffness loss caused by the opening of the cavity; in this embodiment, a through hole is opened in the middle of the damper 23 extending from top to bottom, and slots are set on the outer periphery and bottom of the damper 23; each magnetic pole patch 24 is respectively fixedly connected to each slot of the damper 23; the spring 22 is placed in the through hole of the damper 23, and its lower end is fixed to the upper surface of the magnetic pole patch 24 at the bottom of the damper 23, and the upper end is fixed to the lower surface of the limit fixing 21. In this embodiment, the amplitude of the pendulum vibration absorber 2 is related to the stiffness coefficient of the spring 22 and the damping coefficient of the damper 23. The vibration reduction performance can be optimized by adjusting the stiffness coefficient of the spring 22 and the damping coefficient of the damper 23 designed in this embodiment.

[0058] As another preferred embodiment, the limiting fixing member 21 includes a limiting cover body and legs connected to the limiting cover body, the ends of each magnetic pole piece located on the side wall of the cavity 5 form a longitudinal narrow channel with the inner wall of the cavity 5, and each leg of the limiting fixing member 21 is arranged in the longitudinal narrow channel. The upper surface of the limiting cover body is flush with the upper surface of the knife body 1 and is fixedly connected to the knife body 1, thereby realizing stable installation of the limiting fixing member 21.

[0059] The cavity 5 in this embodiment is a rectangular cavity, and the plurality of pole pieces include a rectangular pole piece 31 and a square pole piece 32, wherein the square pole piece 32 is fixedly connected to the bottom of the cavity 5; the rectangular pole pieces 31 are fixedly connected to the periphery of the cavity 5, and the sides of the rectangular pole pieces 31 and the square pole pieces 32 with the same polarity as the pole pieces are all facing the center of the cavity 5. The rectangular cavity, the rectangular pole pieces 31 and the square pole pieces 32 are easier to operate, and the sides are symmetrical, which can better realize the energy transfer and consumption of the two opposite sides, so as to better cope with the vibration energy from different directions.

[0060] The four corners of the cavity 5 in this embodiment and the rectangular magnetic pole pieces 31 on the two adjacent side walls at each corner together form four longitudinal narrow passages with a length and width of 1 mm. There are four legs, which are respectively arranged in the four longitudinal narrow passages in a one-to-one correspondence. The four legs cooperate with the four longitudinal narrow passages to evenly support the limit cover plate at four positions, providing a more stable support force for the limit cover plate.

[0061] In this embodiment, the blade body 1 includes a blade body frame, the wall thickness of the blade body frame is 1.5mm-3mm, the wall thickness of each cavity 5 is 1mm-2mm, the bottom thickness of the cavity 5 is 3mm-5mm, and the space between the blade body frame and each cavity 5 is a BCC lattice structure. The above-mentioned size design of this embodiment can provide sufficient rigid support for the BCC crystal structure 6 through the solid frame structure, while ensuring the rigidity of the entire blade body 1. The blade body 1 of this embodiment takes into account the performance of lightweight, energy consumption and rigidity, and can better meet the use requirements and achieve the purpose of reducing chatter.

[0062] As a preferred embodiment, the plurality of cavities 5 are evenly arranged to form a uniform vibration reduction and energy dissipation structure on the entire blade body 1 , thereby avoiding the problem of vibration energy accumulation in a part of the blade body 1 .

[0063] As another preferred embodiment, the processing method of the blade body 1 is 3D printing, and the material of the BCC lattice structure is 316 stainless steel or other metal powder used for 3D printing.

[0064] As another preferred embodiment, a cemented carbide blade 4 is installed at the top of the cutter body 1, and the cutter body 1 and the cemented carbide blade 4 are installed in a conventional manner in the prior art.

[0065] like Figures 1 to 4 As shown, this embodiment provides a lightweight vibration-damping turning tool bar, including a tool body 1 (i.e., a tool bar body), a pendulum-type vibration absorber 2, a closed magnetic pole device 3, and a cemented carbide blade 4. The internal topological structure of the tool body 1 is a BCC lattice structure, such as Figure 1-Figure 4 As shown, three inner cavities are evenly opened inside the cutter body 1; the closed magnetic pole piece 3 is welded in the cavity 5 of the BCC cutter body 1; the pendulum type vibration absorber 2 is placed inside the closed magnetic pole piece 3; and the carbide blade 4 is installed on the top of the cutter body 1.

[0066] For example, the wall thickness of the blade body 1 is 1.5 mm, the wall thickness of the cavity 5 is 1 mm, the bottom thickness of the cavity 5 is 3 mm, the three cavities 5 are spaced 27.5 mm apart, and the rest of the space is a BCC lattice structure. The specific structure of the BCC lattice structure is as follows: Figure 27-Figure 28 As shown, it can achieve the best anti-vibration effect while meeting the rigidity. The material of the blade body 1 is 316L stainless steel, and the processing method is 3D printing. The powder particle size is 15um-53um, and the printing parameters are set as follows: powder thickness 30um, laser power 350W, scanning spacing 80um, and scanning waiting time 15s. This printing parameter is suitable for the WXL-120E printer, which can ensure that the inside of the blade body 1 has the maximum density.

[0067] The closed pole piece 3 includes a rectangular pole piece 31 and a square pole piece 32. The square pole piece 32 is fixedly connected to the bottom of the cavity 5 of the blade body 1; the rectangular pole pieces 31 are evenly fixedly connected to the periphery of the cavity 5, and each pole piece is S-pole inward, and the four rectangular pole pieces 31 and the periphery of the cavity 5 form a narrow channel with a length and width of 1 mm.

[0068] like Figure 5-Figure 8 As shown, the pendulum vibration absorber 2 includes a limiting fixing member 21 , a spring 22 , a damper 23 and a magnetic pole patch 24 . Figure 9-12 The specific structure of the damper 23 is shown in the figure. It can be seen from the figure that a through hole is opened in the middle of the damper 23, and slots are set in five directions: the front end, rear end, left end, right end and lower end of the damper 23; the magnetic pole patch 24 is fixedly connected to the five slots at the front end, rear end, left end, right end and lower end of the damper 23, and the magnetic pole patches 24 in the five directions are all S-pole outward. The spring 22 is a micro spring, which is placed in the through hole of the damper 23, and its lower end is welded to the upper surface of the magnetic pole patch 24, and its upper end is welded to the lower surface of the limit fixing member 21; the limit fixing member 21 is provided with four legs, which are respectively placed in the longitudinal narrow channel formed by the closed magnetic pole device 3 and the four corners of the cavity 5, and the upper surface of the limit fixing member 21 is flush with the upper surface of the blade body 1 and is welded to the upper surface of the blade body 1.

[0069] In this embodiment, the interior of the tool body 1 is designed as a BCC lattice structure, which can reduce the weight of the tool rod by 61.7%. In the long overhang state, the internal BCC topological structure has a lighter weight and good energy absorption capacity, thereby reducing the impact of vibration on the processing quality during cutting.

[0070] This embodiment also designs a pendulum-type vibration absorber 2 and a closed magnetic pole device 3. During cutting, the vibration energy generated by the tool rod is first consumed through the BCC lattice structure. Secondly, the residual vibration energy of the tool body 1 is transferred through the principle of magnetic repulsion of the S poles of the pendulum-type vibration absorber 2 and the closed magnetic pole device 3. The residual energy of the tool body 1 is transferred to the pendulum-type vibration absorber 2, and the residual vibration energy is dissipated through the swing of the pendulum-type vibration absorber 2. With the support of the damping performance of the BCC lattice structure, the closed magnetic pole device 3 and the pendulum-type vibration absorber 2, the vibration energy is dissipated through the process of consumption-transfer-re-consumption, avoiding tool wear and chipping problems. At the same time, because this embodiment maximizes the suppression of chatter, it also improves processing stability.

[0071] This embodiment of Figure 13-Figure 15 The assembly method of the closed magnetic pole device 3 and the pendulum vibration absorber 2 is shown;

[0072] This embodiment of Fig.16 This is a schematic diagram of the magnetic field strength in the closed magnetic pole device of this embodiment;

[0073] To further illustrate the vibration reduction performance of the present invention, a detailed description is given below in conjunction with the accompanying drawings of simulation tests.

[0074] like Fig.17 As shown, the blade body with BCC crystal structure 6 (referred to as BCC blade body) is B1, the blade body with pendulum vibration absorber 2 is B2, and the mass of B1 is m 1 , subject to the stiffness system Number k 1 , damping coefficient c 1 The elastic support of B2 is m 2 , with stiffness coefficient k 2 Spring 22 and damping coefficient c 2 The damper 23 is connected to B1, and B1 is subjected to a simple harmonic force Fe iωt Incentives. Fig.17 As shown, the dynamic equation of this system is:

[0075] ;

[0076] In the formula, is the mass matrix, is the damping matrix, is the stiffness matrix, is the force matrix; e is the symbol of simple harmonic force, is the frequency, is an imaginary number, t For time;

[0077] The matrices are defined as:

[0078] ;

[0079] in , are the vertical displacements of B1 and B2 relative to their equilibrium positions, is the amplitude of the exciting force, let:

[0080] ;

[0081] In the formula, A is the amplitude matrix, A 1 is the amplitude of B1, A 2 is the amplitude of B2;

[0082] Substituting into the equation:

[0083] ;

[0084] The solution is:

[0085] ;

[0086] in is the complex frequency response matrix;

[0087] ;

[0088] ;

[0089] The amplitude of the forced vibration is obtained as:

[0090] ;

[0091] in, is the amplitude of B1, is the amplitude of B2;

[0092] Set the amplitude of B1 to Written as:

[0093] ;

[0094] in The function is defined as:

[0095] ;

[0096] In order to eliminate the vibration of BCC cutter body B1 without damping, , and its sufficient condition is:

[0097] ;

[0098] When m 1 >> m 2 When the natural frequency of the blade body B2 with pendulum vibration absorber 2 is required The natural frequency of BCC tool body B1 Close to the excitation frequency, the amplitude of BCC blade B1 can be achieved Almost zero, at this time the BCC tool body still has residual vibration, and the forced vibration amplitudes of B1 and B2 are:

[0099] ;

[0100] If you choose a smaller pendulum absorber 2 mass m 2 and stiffness coefficient k 2 and a strong damping coefficient c2 , and assuming that the damping of the BCC blade is much greater than the damping of the pendulum damper 2, then c 1 c 2 >> k 2 m 2 . Then derive A 1， A 2 The approximate value of the modulus is

[0101] ;

[0102] It can be seen that the amplitude of the BCC cutter body depends on the damping coefficient c 1 , and the damping coefficient c 1 Related to the lattice structure inside the blade; the amplitude and stiffness coefficient of the pendulum vibration absorber 2 k 2 and the damping coefficient c 2 Therefore, the shock absorption performance can be optimized by adjusting the stiffness coefficient and damping coefficient.

[0103] The above is the vibration reduction principle of the present invention.

[0104] like Figure 18-Figure 21 As shown, the present invention provides three models for ANSYS simulation, namely, a solid cutter body, a BCC cutter body, and a cutter body with a pendulum-type vibration absorber 2. The three models are respectively imported into ANSYS Workbench, and a fixed support is applied to the left end face of the cutter body. The modal analysis of the three cutter bodies from the 1st order to the 20th order is performed, and the following is obtained: Figure 8 The comparison results shown in the figure show that the vibration frequency of the solid blade is the highest, followed by the BCC blade, and the blade with the pendulum vibration absorber 2 has the lowest vibration frequency, indicating that the BCC lattice structure has a good absorption effect on vibration energy.

[0105] This embodiment of Fig. 22 for Figure 18-Figure 20 The modal analysis vibration frequency comparison chart of the three types of tool bodies;

[0106] This embodiment of Figure 23-Figure 26The transient excitation vibration deformation waveforms of the three blades are shown in Figure 1. The upper curve in each figure is the maximum value of the transient excitation vibration deformation waveform, and the lower curve is the average value of the transient excitation vibration deformation waveform. The three blades are simulated by transient impact test. The transient impact force increases from 0s-0.01s to 300N, and then decays to 0 in 0.01s-0.02s. It is applied to the blade tip to observe the vibration resistance of the three blades. The results show that the vibration deformation peak value of the solid blade after transient impact is 5.2713e-3mm, the vibration deformation peak value of the BCC blade is 2.1106e-3mm, the vibration deformation peak value of the blade with pendulum vibration absorber 2 is 1.2598e-3mm, and the vibration deformation peak value of the pendulum vibration absorber 2 inside the blade is 2.5622e-2mm, indicating that the pendulum vibration absorber 2 successfully achieves vibration transfer.

[0107] The above simulation test results show that the BCC lattice structure can not only reduce weight, but also has a good absorption effect on vibration energy. The design of the pendulum vibration absorber 2 successfully reduces the peak value of the solid tool body from 5.2713e-3mm to 1.2598e-3mm, realizing the transfer of tool body vibration. With the support of the BCC lattice structure and the pendulum vibration absorber 2, the vibration energy is dissipated through the process of consumption-transfer-re-consumption. The chatter is suppressed to the maximum extent and the processing stability is improved.

[0108] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight vibration-damping turning tool bar, characterized in that: include: The blade body (1) has a plurality of cavities (5) formed along the length direction. ， The blade body (1) between adjacent cavities (5) has a BCC lattice structure; A closed magnetic pole device (3) comprising a plurality of magnetic pole pieces respectively located on the bottom and side walls of the cavity (5); A pendulum-type vibration absorber (2) is placed inside a closed magnetic pole device (3) formed by the plurality of magnetic pole pieces, and magnetic pole patches (24) corresponding to the magnetic pole pieces are respectively arranged on the outer surface of the pendulum-type vibration absorber (2), and the magnetic pole patches (24) are arranged opposite to the side of the magnetic pole pieces with the same polarity, so that the magnetic pole pieces and the corresponding magnetic pole patches (24) repel each other magnetically; The pendulum vibration absorber (2) comprises: A limiting fixing member (21) is placed on the top of the cavity (5) and is fixedly connected to the top of the cavity (5); The damper (23) has a through hole extending vertically through the middle thereof, and slots are arranged on the outer periphery and the bottom of the damper (23); and each magnetic pole patch (24) is respectively fixedly connected to each slot of the damper (23); A spring (22) is placed in the through hole of the damper (23), with its lower end fixed to the upper surface of the magnetic pole patch (24) at the bottom of the damper (23), and its upper end fixed to the lower surface of the limiting fixture (21); the limiting fixture (21) includes a limiting cover body and legs connected to the limiting cover body, the ends of each magnetic pole piece located on the side wall of the cavity form a longitudinal narrow channel with the inner wall of the cavity, and each leg of the limiting fixture (21) is placed in the longitudinal narrow channel, and the upper surface of the limiting cover body is flush with the upper surface of the knife body (1) and is fixedly connected to the knife body (1).

2. The lightweight vibration-damping turning tool bar according to claim 1, characterized in that: The cavity (5) is a rectangular parallelepiped cavity, and the plurality of magnetic pole pieces include rectangular magnetic pole pieces (31) and square magnetic pole pieces (32), wherein the square magnetic pole pieces (32) are fixedly connected to the bottom end of the cavity (5); the rectangular magnetic pole pieces (31) are all fixedly connected to the side walls of the cavity (5), and the S poles of the rectangular magnetic pole pieces (31) and the square magnetic pole pieces (32) are all facing the center of the cavity (5).

3. The lightweight vibration-damping turning tool bar according to claim 2, characterized in that: The four corners of the cavity (5) and the rectangular magnetic pole pieces (31) on two adjacent side walls at each corner jointly form four longitudinal narrow passages, and the number of legs is four and they are respectively arranged in the four longitudinal narrow passages in a one-to-one correspondence.

4. The lightweight vibration-damping turning tool bar according to claim 1, characterized in that: The blade body (1) comprises a blade body frame, the wall thickness of the blade body frame is 1.5 mm to 3 mm, the wall thickness of each cavity (5) is 1 mm to 2 mm, the bottom thickness of the cavity (5) is 3 mm to 5 mm, and the space between the blade body frame and each cavity (5) is a BCC lattice structure.

5. The lightweight vibration-damping turning tool bar according to claim 1 or 4, characterized in that: The multiple cavities (5) are evenly arranged.

6. The lightweight vibration-damping turning tool bar according to claim 1, characterized in that: The knife body (1) is processed by 3D printing.

7. The lightweight vibration-damping turning tool bar according to claim 1, characterized in that: A cemented carbide blade (4) is installed on the top end of the knife body (1).

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