CN115709295A - Self-adaptive vibration-damping boring bar filled with shear thickening fluid - Google Patents
Self-adaptive vibration-damping boring bar filled with shear thickening fluid Download PDFInfo
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- CN115709295A CN115709295A CN202211575167.1A CN202211575167A CN115709295A CN 115709295 A CN115709295 A CN 115709295A CN 202211575167 A CN202211575167 A CN 202211575167A CN 115709295 A CN115709295 A CN 115709295A
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Abstract
The invention discloses a self-adaptive vibration-damping boring bar filled with shear thickening fluid, belongs to the technical field of metal cutting machining, and aims to solve the problems that in the prior art, a passive vibration-damping boring cutter boring bar is small in adjustment range, large in debugging difficulty, difficult to maintain, complex in boring bar system of an active vibration-damping boring cutter, troublesome to maintain and complex to operate. The invention comprises a cutter bar, a cutter head, a cutter blade, n +1 springs, n mass blocks and filling liquid; a cavity is arranged in the boring bar and close to the front end of the boring bar, the front end of the cavity is open, the open end of the cavity and the rear end of a cutter head are arranged in a sealing mode, and the cutter head is used for clamping a blade; a plurality of mass blocks are arranged in the cavity along the axial direction in a straight line, the mass blocks and the front end and the rear end of the cavity are connected through springs, and the cavity is filled with shear thickening fluid. The invention is used for the vibration reduction boring bar suitable for various working conditions.
Description
Technical Field
The invention relates to a vibration reduction technology of a boring bar, and belongs to the technical field of metal cutting machining.
Background
In the cutting process, the inner hole processing accounts for 33 percent of the total processing amount, and after the 21 st century, deep hole parts are widely applied to military and civil fields, wherein the deep hole parts mostly relate to important fields such as military industry, aerospace, energy equipment and the like which relate to national defense and civil life.
Compared with other processing modes, the deep hole processing by boring has many advantages, including: the machining size range is large, the machining efficiency is high, the economy is good, the operation is simple and convenient, chips are easy to remove, and the like. However, the existing boring technology has inherent defects that the boring rod needs to go deep into the part for cantilever type processing, the overhanging amount of the boring rod is large (the maximum diameter exceeds 15 times), so that the boring rod has the characteristic of weak rigidity, the boring rod is easy to deform and cause the vibration of a rod body in the processing, and the vibration is the most critical factor for influencing the processing quality and efficiency.
In order to improve the cutting quality, the vibration of the boring bar needs to be controlled, and the vibration-damping boring bar is divided into two types: the active vibration damping boring bar generally achieves the purpose of active vibration damping through complex structures such as variable rigidity, variable damping and the like, so that the system is complex. The passive vibration damping boring bar is relatively simple in structure, but once the existing passive vibration damping boring bar is manufactured and molded, the adjustable rigidity and damping range of the passive vibration damping boring bar are fixed, namely the vibration range suitable for adjustment is determined, the adjustment range is small, the debugging difficulty is high, and the maintenance and the repair are difficult.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the adjusting range of a boring bar of a passive vibration-damping boring cutter is small, the debugging difficulty is high, the maintenance is difficult, the boring bar system of an active vibration-damping boring cutter is complex, the maintenance is troublesome and the operation is complex, and further provides a self-adaptive vibration-damping boring bar filled with shear thickening fluid.
The self-adaptive vibration-damping boring bar filled with the shear thickening fluid comprises a cutter bar 1, a cutter head 2, a cutter blade 3, n +1 springs 4, n mass blocks 5 and a filling fluid 6, wherein n is more than or equal to 4;
a cavity is arranged in the boring bar and close to the front end of the boring bar, the front end of the cavity is open, the open end of the cavity and the rear end of the cutter head 2 are arranged in a sealing mode, and the cutter head 2 is used for clamping the cutter blade 3;
a plurality of mass blocks 5 are arranged in the cavity along the axial direction in a straight line, the mass blocks 5 and the mass blocks 5 are connected with the front end and the rear end of the cavity through springs 4, and the cavity is filled with shear thickening liquid 6.
Preferably, the boring bar cavity radial section is coincident with the mass 5 radial section.
Preferably, the boring bar cavity is circular in radial cross section, and the mass 5 is a cylinder.
Preferably, the boring bar cavity has a square radial cross section, and the mass 5 is a cube.
Preferably, the n masses 5 are identical in shape.
Preferably, the mass of the n mass blocks 5 is decreased by 10% -25% from the front end to the rear end of the cavity in sequence along the axial direction.
Preferably, the mass reduction is achieved by thickness reduction.
The invention has the beneficial effects that: when the boring bar is static, the gravity centers of all the mass blocks are almost positioned on the same straight line, when the boring bar vibrates, the vibration is transmitted to the mass blocks 5 through the springs, the mass blocks 5 vibrate and impact the shear thickening fluid, so that the particles in the shear thickening fluid are contacted, collided and rubbed with each other, and the vibration energy is dissipated. The more violent the boring bar vibrates, the more violent the mass block vibrates, the larger the impact on the shear thickening liquid, the higher the shear rate, and when the shear thickening liquid is subjected to the higher shear rate, the viscosity of the shear thickening liquid becomes more viscous, the larger the damping force on the mass block is, the more the consumed vibration energy is, so that the self-adaptive vibration reduction is realized. Meanwhile, the mass of the mass block is decreased progressively from the front end to the rear end of the cavity, the mass block is close to the violent vibration position of the cutter head, the designed mass block has large mass, more energy is absorbed, and the integral vibration absorption effect of the mass block is improved.
The vibration reduction boring bar can adaptively adjust the vibration reduction performance according to the actual processing working condition and the characteristics of the structure of the boring bar, and improves the processing quality and efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an adaptive vibration damping boring bar filled with shear thickening fluid according to the present invention;
FIG. 2 is a displacement curve of mass center points of the boring bar with the same mass of the mass block;
FIG. 3 is a displacement curve of mass center points of each mass block of the boring bar when the mass of the mass block is decreased;
FIG. 4 is a graph comparing the displacement of the tool tip with the same mass of the mass and decreasing mass of the mass;
FIG. 5 is a viscosity-shear rate curve for a shear thickening fluid.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The first specific implementation way is as follows: the embodiment is described below with reference to fig. 1 to 4, and the adaptive vibration damping boring bar filled with shear thickening fluid comprises a cutter bar 1, a cutter head 2, a blade 3, n +1 springs 4, n mass blocks 5 and filling fluid 6, wherein n is greater than or equal to 4;
a cavity is arranged in the boring bar and close to the front end of the boring bar, the front end of the cavity is open, the open end of the cavity and the rear end of the cutter head 2 are arranged in a sealing mode, and the cutter head 2 is used for clamping the cutter blade 3;
a plurality of mass blocks 5 are arranged in the cavity along the axial direction in a straight line mode, the mass blocks 5 are connected with one another, the mass blocks 5 are connected with the front end and the rear end of the cavity through springs 4, and the cavity is filled with shear thickening fluid 6.
The radial section of the boring bar cavity is consistent with that of the mass block 5. The radial section of the cavity of the general boring bar is circular or square, and when the radial section of the cavity of the boring bar is circular, the mass block 5 is adaptive to be a cylinder. When the radial section of the boring bar cavity is square, the mass block 5 is adaptive to be cubic.
The n masses 5 are identical in shape. The mass of the n mass blocks 5 is decreased by 10-25% from the front end to the rear end of the cavity along the axial direction. The mass reduction is realized by the thickness reduction.
With n =4 as a preferred scheme, in this embodiment, the 4 mass blocks 5 are all cylinders, the diameter of the subsequent cylinder is the same as that of the previous cylinder, the thickness of the subsequent cylinder is successively thinner than that of the previous cylinder, and the mass and the volume of the mass block near the cutter head are the largest. The cavity is filled with a shear thickening fluid 6, which is a novel smart material generally consisting of dispersed phase particles and a dispersion medium. The dispersed phase particles can be classified into three categories: the natural mineral particles are (1), the deformable particles are (2), and the artificial synthetic particles are (3). The commonly used synthetic particles are PSt-EA (polystyrene-ethyl acrylate), PMMA (polymethyl methacrylate), and the like.
The distribution rule of the mass block 5 in the cavity is as follows: the mass of each mass block is sequentially decreased by 10-25% from the front end to the rear end of the cavity along the axial direction. The vibration amplitude of the mass block close to the cutter head is the largest and is in a descending trend in the direction from the cutter head to the cutter rod. Firstly, the larger the amplitude of vibration is, the more work the mass block needs to do to reach an amplitude point is, the more vibration energy is consumed, and the better the vibration reduction effect is; secondly, the larger the amplitude of the vibration is, the larger the speed gradient generated by the vibration is, the larger the shearing rate is, the larger the viscosity of the corresponding shear thickening fluid is, the larger the damping force applied to the mass block is, and thus, the more the vibration energy is consumed. Therefore, the mass blocks 5 arranged close to the cutter head have the largest mass, and the mass of each mass block in the direction from the cutter head to the tail of the boring bar is gradually reduced, so that the integral vibration absorption effect of the mass blocks is greatly improved.
The basic performance of the shear thickening fluid is generally expressed by rheological properties, fig. 5 is a typical rheological curve, the shear thickening fluid shows different viscosities at different shear rates, different concentrations (wt) of dispersed phase particles also have influence on the rheological curve, and the shear thickening fluid is generally measured by a rheological test, is an inherent characteristic of the shear thickening fluid and is related to the types and preparation processes of the dispersed phase particles, so that a target shear thickening fluid can be prepared according to needs to meet the requirements of the self-adaptive damping boring bar.
The vibration damping principle of the present invention is analyzed in a comparative manner as follows.
The two control groups were: the boring bar with 4 mass blocks identical is a boring bar 1, and the boring bar with 4 mass blocks changing according to the invention (the mass of the mass blocks decreases from the front end to the rear end of the cavity along the axial direction) is a boring bar 2.
And respectively performing dynamic simulation on the boring rod 1 and the boring rod 2 by abaqus, applying a periodic force F = A · sin ω t in the x direction to a tool nose point, applying an amplitude A =200N, setting the frequency to be 25hz, and outputting the results as the displacement of the tool nose point and the displacement of the mass center point of each mass block, wherein the unit is mm.
Firstly, a boring bar 1 (the length of the bar is 500mm, the diameter of the boring bar is 20mm, the length of the cavity is 120mm, the diameter of the boring bar is 17mm, the diameters of mass blocks are 15mm, the lengths of the mass blocks are 20mm, and the length of a spring is 8 mm) is simulated, and it is found that the vibration of the mass block No. 1 close to a tool bit is most severe, the vibration of the mass blocks No. 3 at the front part is in a descending trend in the direction from the tool bit to the tool tail, the vibration of the mass block No. 4 at the tail part is in an ascending trend, but the vibration amplitude of the mass block No. 4 is obviously smaller than that of the first mass block, and the vibration of each mass block is shown in figure 2.
The boring bar 2 (bar length 500mm, diameter 20mm; cavity length 120mm, diameter 17mm; mass diameters 15mm, lengths 26mm,22mm,18mm, and 14mm, respectively (maximum mass at the position close to the cutter head); and length of the spring 8 mm) was simulated, and the vibration of each mass was as shown in fig. 3.
Further, fig. 4 is a vibration diagram at the point of the nose of the boring bar 1 and the boring bar 2. Through the analysis of a simulation result, firstly, the vibration at the tool nose point of the boring bar 2 is obviously smaller than the vibration at the tool nose point of the boring bar 1; secondly, the vibration amplitude of the mass block close to the cutter head is large, the boring bar 2 is provided with a large mass block at the cutter head, more energy can be consumed, meanwhile, in the same time, the larger the amplitude of the mass block is, the larger the v = s/t is, the larger the average speed is, the larger the shearing rate is, the larger the viscosity eta of the corresponding shear thickening liquid is, the larger the damping force applied to the mass block is, and the more the vibration energy is consumed. The boring bar 2 is provided with the mass decreasing and shear thickening liquid filling purposes, so that the vibration absorption effect of the mass block is improved, meanwhile, the boring bar is upgraded into a self-adaptive vibration absorption boring bar, the self-adaptive vibration absorption boring bar can be used for more working conditions, more practical use values are provided, and the vibration absorption effect is optimal.
In conclusion, firstly, when the shear thickening fluid is not added, the vibration amplitude of the boring bar 2 is smaller than that of the boring bar 1, the vibration amplitude of the bar body is reduced, and the structure advantage is achieved; secondly, after the shear thickening fluid is added, the shear thickening fluid can absorb a part of energy, vibration reduction is facilitated, and meanwhile, the passive boring bar is upgraded to the self-adaptive boring bar, which is the advantage of adding the shear thickening fluid; when the boring bar 1 and the boring bar 2 are under the same working condition, the shear thickening fluid can absorb more energy in the processing process by virtue of the mass block design of the boring bar 2, and compared with the boring bar 1, the vibration amplitude of the bar is further reduced, so that the shear thickening fluid has advantages. And when the boring bar 2 works under different working conditions, the vibration range is likely to change greatly, but because the shear thickening fluid is added, the energy can be dissipated by the contact, collision and friction of particles in the shear thickening fluid, and meanwhile, each mass block vibrates, the shear thickening fluid filled in the shear cavity vibrates more intensely, the shearing rate is higher, the shear thickening fluid is thicker, the damping force on the mass block is higher, the consumed vibration energy is higher, and therefore self-adaptive vibration reduction is realized. And because the adjustment is self-adaptive, the adjustment is not needed, so that the difficulty of debugging and maintenance is reduced.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. The self-adaptive vibration-damping boring bar filled with shear thickening fluid is characterized by comprising a cutter bar (1), a cutter head (2), a blade (3), n +1 springs (4), n mass blocks (5) and filling fluid (6), wherein n is more than or equal to 4;
a cavity is arranged in the boring bar and close to the front end of the boring bar, the front end of the cavity is open, the open end of the cavity and the rear end of the cutter head (2) are oppositely and hermetically arranged, and the cutter head (2) is used for clamping the blade (3);
a plurality of mass blocks (5) are arranged in the cavity along the axial direction in a straight line, the mass blocks (5) and the mass blocks (5) are connected with the front end and the rear end of the cavity through springs (4), and the cavity is filled with shear thickening fluid (6).
2. The adaptive vibration damping boring bar filled with shear thickening fluid according to claim 1, wherein the radial cross section of the boring bar cavity is consistent with the radial cross section of the mass block (5).
3. The adaptive vibration damping boring bar filled with shear thickening fluid according to claim 2, wherein the boring bar cavity has a circular radial cross section and the mass block (5) is a cylinder.
4. The self-adaptive damping boring bar filled with shear thickening fluid according to claim 2, wherein the radial section of the boring bar cavity is square, and the mass block (5) is cubic.
5. The adaptive vibration damping boring bar filled with shear thickening fluid according to claim 1, characterized in that n masses (5) are identical in shape.
6. The self-adaptive damping boring bar filled with shear thickening fluid according to claim 1, wherein the mass of the n mass blocks (5) is decreased by 10-25% from the front end to the rear end of the cavity in sequence along the axial direction.
7. The adaptive vibration damping boring bar filled with shear thickening fluid of claim 6, wherein mass reduction is achieved by thickness reduction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211575167.1A CN115709295A (en) | 2022-12-08 | 2022-12-08 | Self-adaptive vibration-damping boring bar filled with shear thickening fluid |
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| CN202211575167.1A CN115709295A (en) | 2022-12-08 | 2022-12-08 | Self-adaptive vibration-damping boring bar filled with shear thickening fluid |
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| CN111155672A (en) * | 2020-01-10 | 2020-05-15 | 中国电子工程设计院有限公司 | Self-adaptive tuned mass damper based on shear thickening liquid |
| CN210916979U (en) * | 2019-09-03 | 2020-07-03 | 哈尔滨工业大学（深圳） | TMD device for realizing frequency self-tuning through shear thickening damping fluid |
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| CN113394733A (en) * | 2021-06-24 | 2021-09-14 | 重庆科技学院 | Self-adaptive damping spacer |
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| CN217860252U (en) * | 2022-07-16 | 2022-11-22 | 威海市科达精密机械有限公司 | Double-knife type vibration reduction turning device for intelligent production of fitness equipment accessories |
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2022
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