CN1788895A - Vibration self-suppressed intelligent boring bar component based on magnetorheological fluid - Google Patents
Vibration self-suppressed intelligent boring bar component based on magnetorheological fluid Download PDFInfo
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- 239000012530 fluid Substances 0.000 title description 3
- 239000007788 liquid Substances 0.000 claims abstract description 29
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- 238000006243 chemical reaction Methods 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 24
- 230000008859 change Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 4
- 239000012528 membrane Substances 0.000 abstract 2
- 230000007363 regulatory process Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000013016 damping Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 239000011344 liquid material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000001629 suppression Effects 0.000 description 5
- 239000006096 absorbing agent Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000000518 rheometry Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
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Abstract
The present invention discloses one kind of automatic vibration inhibiting intelligent boring bar membrane based on magnetic rheologic liquid. The boring bar is provided with a magnetic rheologic vibration inhibiting executor, an acceleration sensor connected to the charge amplifier in the control system, and an exciting coil connected to the power amplifier in the control system. The present invention proposes one new boring flutter inhibiting method integrating sin sensing, amending, analysis and treating and feedback control for automatic vibration inhibiting intelligent boring bar membrane. The magnetic rheologic liquid with the characteristic of being capable of converting between liquid state and solid state fast is used in the dynamic boring bar regulating process, and the magnetic field strength on the magnetic rheologic liquid is regulated to change the dynamic characteristic of the boring bar timely, so as to keep away from the flutter frequency and inhibit flutter effectively.
Description
Technical field
The present invention relates to field of mechanical technique, relate in particular to a kind of vibration self-suppressed intelligent boring bar component based on magnetic flow liquid.
Background technology
PRECISION HOLE in the engineering goods, as casing bore of engine etc., the position of most critical in the mechanical system often, because its processing difficulties, crudy is difficult to be guaranteed, and is the difficult point of machining always.How to improve the crudy and the efficient of PRECISION HOLE, become one of important topic that needs to be resolved hurrily in the machinery manufacturing industry already.Right boring is a kind of important method of PRECISION HOLE processing, however the main cause of problem such as the flutter that takes place in the right boring process causes often that the PRECISION HOLE machining accuracy is low, surface quality difference and working (machining) efficiency are not high.In addition, flutter also can be quickened the wearing and tearing of tooling system, the physical and mental health that produces very noisy and endanger the operator.In order to solve the flutter problem of boring process, Chinese scholars has all been carried out number of research projects, wherein mainly contains: [1]. and the international control of holding in nineteen ninety-five of the 4th IEEE is used the collection of thesis of meeting and has been reported that Bu Di people such as (Budi W.) suppresses the method for the flutter of boring bar at the inner electromagnetism bump leveller of placing ACTIVE CONTROL of boring bar for the 868th～874 page; [2]. the collection of thesis of the ACC meeting of holding at seattle, u.s.a in June nineteen ninety-five has reported that Michael people such as (Michael) adopts the method that suppresses the flutter of boring bar at the inner piezo-activator of placing ACTIVE CONTROL of boring bar for the 739th～743 page; [3]. the international control of holding at U.S.'s dearborn in 1996 of IEEE is used the collection of thesis of meeting and has been reported that Ji Pan people such as (G.Pan) adopts the method that suppresses the flutter of boring bar at the inner ultra-magnetic deformation actuator of placing ACTIVE CONTROL of boring bar for the 235th～239 page; [4]. reported that 19～21 pages of " tool technique " magazines in 1997 the 31st volume people such as Li Qitang is applied to boring bar vibration damping process with dynamic vibration absorber, can effectively avoid the method for the generation of process electric shock phenomenon; [5]. reported that 1827～1829 and 1855 pages of " Chinese mechanical engineering " magazines in 2002 the 13rd volume people such as Zhao Yongcheng proposes to adopt technique of Squeeze Liquid Film Damping in the PRECISION HOLE process, between tooling system and work piece, produce the extruding liquid film, form the liquid film damping effect, make boring bar tool be difficult to the method for starting of oscillation; [6]. at " International Journal of Machine Tools in 1999; Manufacture " 1925～1934 pages of magazine the 39th volume have reported that people such as Wang Min put on the dynamic characteristic that electric-field intensity on the er material changes whole boring bar by adjusting, and so as to suppressing the method for cutting-vibration.
At the control method of above-mentioned boring bar flutter,, can reduce three classes: (1) passive vibration damping mode according to the vibration damping mode.Document [4-5] but in the mode of shaking of boring bar all belong to passive vibration damping mode, simple in structure, but, only be applicable to the situation of scramble basic fixed because the shock absorber intrinsic frequency is generally non-adjustable, if scramble changes in a big way, poor effect then.(2) active damping mode.Document [1-3] but in the mode of shaking of boring bar all belong to the active damping mode, they can be under different operating modes, feedback signal according to sensor, the shock absorber intrinsic frequency is carried out continuous adjusting, effectiveness in vibration suppression is better than passive vibration damping mode, but have shortcomings such as energy consumption height, cost height, poor reliability, make that actual production process is difficult to apply.(3) half active damping modes.Document [6] but in the boring bar mode of shaking belong to half active damping mode, it mainly is the response that dynamic characteristic parameters such as rigidity by changing vibration damping equipment or damping improve system, its effectiveness in vibration suppression is better than passive vibration damping mode, and compare and have that energy consumption is low, the reliability advantages of higher with the active damping mode, therefore, but the mode of shaking that half active damping is a kind of desirable boring bar flutter, but owing to use er material in the document [6], can bring a series of problems: 1. operating voltage height, the course of work need load several kilovolts high-tension electricity (2KV～5KV); 2. Applicable temperature narrow range, ordinary circumstance is 10 ℃～70 ℃; 3. poor stability, rheology process be subject to make and use in the influence of impurity.At above problem, the present invention proposes a kind of vibration self-suppressed intelligent boring bar structure and system based on magnetic flow liquid.
Magnetorheological phenomenon is found in 1948 that by Jacob Rabinow its concise and to the point mechanism is that its viscosity can change along with changes of magnetic field magnetorheological materials (Magnetorheological Fluids is called for short MRF) under the effect of magnetic field.Magnetorheological materials is a kind of controlled fluid, under the effect of magnetic field, can produce tangible magnetic rheology effect, can liquid and solid-state between carry out rapidly, continuously, reversible conversion, realize the stepless variation of rigidity and damping characteristic parameter, its mechanical property only is the millisecond magnitude with the response time of change of magnetic field strength, much smaller than the time that general control requires.The magnetic flow liquid material is compared with the er material of use in the document [6] and had the following advantages: 1. operating voltage is low, is generally 2V～15V; 2. energy consumption is low, cost is low; 3. exceed the yield stress of an order of magnitude; 4. the adaptive temperature scope is wideer, and ordinary circumstance is one 40 ℃～150 ℃; 5. good stability, rheological behavior is subjected to the influence of magazine insensitive.The good characteristic of magnetic flow liquid material has caused damping technology expert's very big interest, and Chinese scholars has been carried out many researchs, and has been applied to the vibration control in fields such as automobile suspension system, rotor-support-foundation system.But, adopt the magnetic flow liquid material to carry out the research report that boring bar shakes both at home and abroad but yet there are no at present according to searching document in a large number.
Summary of the invention
In order to overcome the deficiency of boring Flutter Suppression device, the object of the present invention is to provide a kind of vibration self-suppressed intelligent boring bar component based on magnetic flow liquid.
The technical solution adopted for the present invention to solve the technical problems is: it comprises boring bar, acceleration transducer, boring bar member clamping part, the boring bar part that overhangs, sealing ring, solenoid housing, magnet exciting coil, magnetic flow liquid, support set, end cap.The solenoid housing of coiling magnet exciting coil is housed on the boring bar of boring bar member clamping part; Form in the cavity volume that connects between cylindrical hole and the boring bar in solenoid housing magnetic flow liquid is housed, the cavity volume two ends seal with sealing ring respectively; In the coil hull outside support set is housed, and loads onto end cap at the front end of support set; But above structure constitutes the magnetorheological actuator that shakes; Boring bar overhang the part front end face on acceleration transducer is housed, the charge amplifier of acceleration transducer connected control system, the power amplifier of magnet exciting coil connected control system.
Described control system: comprise charge amplifier, A/D analog-to-digital conversion card, D/A digital-to-analogue conversion card and power amplifier.The output that is fixed on the acceleration transducer (3) on the boring bar overhang sub-headend face is connected with the input of charge amplifier, the input of A/D analog-to-digital conversion card is connected with the output of charge amplifier, universal industrial control computer is connected by the PCI slot with the output of A/D analog-to-digital conversion card, the input of D/A digital-to-analogue conversion card is connected with the PCI slot of universal industrial control computer, the input of power amplifier is connected with the output of D/A digital-to-analogue conversion card, but the magnet exciting coil input of the magnetorheological actuator that shakes is connected with the output of power amplifier.
The beneficial effect that the present invention has is:
This invention has proposed a kind of boring Flutter Suppression method that integrates the vibration self-suppressed intelligent boring bar component of sensing, conditioning, analyzing and processing and FEEDBACK CONTROL.According to the magnetic flow liquid material can carry out rapidly, continuously at liquid, between solid-state, the characteristic of reversible conversion, be applied to the adjustment process of boring bar dynamic characteristic, by the magnetic field intensity of regulating action on the magnetic flow liquid material, change the dynamic characteristic of boring bar in real time, make the boring bar intrinsic frequency can in time avoid the flutter frequency district, take place thereby suppress the flutter of boring process effectively.This invention has promoted the inhibition development of technology of flutter in the boring process, and the aspects such as noise of assurance PRECISION HOLE boring crudy, the life-span of enhancing productivity, prolong tooling system, reduction process all have important use and are worth.
Description of drawings
Fig. 1 is based on the vibration self-suppressed intelligent boring bar component structural representation of magnetic flow liquid;
But the magnetorheological actuator partial enlarged drawing that shakes of Fig. 2;
Fig. 3 is based on the vibration self-suppressed intelligent boring bar system schematic of magnetic flow liquid.
Among the figure: but the 1. magnetorheological actuator that shakes, 2. boring bar, 3. acceleration transducer (perceptron), 4. boring bar clamping part, 5. overhang part, 6. sealing ring of boring bar, 7. solenoid housing, 8. magnet exciting coil, 9. magnetic flow liquid, 10. support set, 11. end caps, 12. charge amplifiers, 13.A/D analog-to-digital conversion card, 14. universal industrials control computer, 15.D/A digital-to-analogue conversion card, 16. power amplifier, 17. control systems.
The specific embodiment
As Fig. 1, Fig. 2, shown in Figure 3, it comprises boring bar 2 the present invention, acceleration transducer 3, boring bar member clamping part 4, the boring bar part 5 that overhangs, sealing ring 6, solenoid housing 7, magnet exciting coil 8, magnetic flow liquid 9, support set 10, end cap 11.The solenoid housing 7 of coiling magnet exciting coil 8 is housed on the boring bar of boring bar member clamping part 4; Form in the cavity volume that connects between cylindrical hole and the boring bar 2 in solenoid housing 7 magnetic flow liquid 9 is housed, the cavity volume two ends are respectively with sealing ring 6 sealings; In solenoid housing 7 outsides support set 10 is housed, and loads onto end cap 11 at the front end of support set 10; But above structure constitutes the magnetorheological actuator 1 that shakes; Boring bar overhangs and acceleration transducer 3 is housed, the charge amplifier of acceleration transducer 3 connected control systems 17, the power amplifier 16 of magnet exciting coil 8 connected control systems 17 on the front end face of part 5.
As shown in Figure 3, described control system 17: comprise charge amplifier 12, A/D analog-to-digital conversion card 13, D/A digital-to-analogue conversion card 15 and power amplifier 16; Being fixed on the overhang charge signal output of the acceleration transducer 3 on part 5 front end faces of boring bar is connected with the charge signal input of charge amplifier 12, the voltage signal input of A/D analog-to-digital conversion card 13 is connected with the voltage signal output end of charge amplifier 12, universal industrial control computer 14 is connected by the PCI slot with the digital signal output end of A/D analog-to-digital conversion card 13, the digital signal input end of D/A digital-to-analogue conversion card 15 is connected with the PCI slot of universal industrial control computer 14, the current signal input of power amplifier 16 is connected with the current signal output end of D/A digital-to-analogue conversion card 15, but magnet exciting coil 8 inputs of the magnetorheological actuator 1 that shakes are connected with the current signal output end of power amplifier 16.
As Fig. 1, Fig. 2, shown in Figure 3, pack internal diameter into than the solenoid housing 7 of the big 4mm of boring bar 2 diameters in boring bar member clamping part 4, make to form the cavity loop that runs through that thickness is 2mm between solenoid housing 7 and the boring bar 2, in this cavity loop, inject magnetic flow liquid 9.On the solenoid housing 7 of magnetic flow liquid 9 peripheries, arrange some groups of magnet exciting coils 8, the magnetic field that is produced by magnet exciting coil 8 is radially distributed and pass inner magnetic flow liquid 9, so just being equivalent to has increased an elasticity and damped coefficient can be by the viscoplasticity spring of magnetic field intensity regulation and control at boring bar 2 ends, and reach the purpose that changes the boring bar dynamic characteristic by it, but this structural assembly has just formed the magnetorheological actuator 1 that shakes.Configuration one acceleration transducer 3 on boring bar overhangs the front end face of part 4, it is the perceptron of system, it can process the vibration situation of holding by online detection boring bar, and dynamic characteristic information in time fed back to control system 17 behind charge amplifier 12, make control decision rapidly by control system 17 then, but send a control signal to the magnetorheological actuator 1 that shakes simultaneously, reach the purpose of Flutter Suppression.
As shown in Figure 3, control system 17 concrete composition and interconnected relationships can be described below: the CPU model that is configured to of universal industrial control computer 14 is PIII667, internal memory 512M, hard disk 30G, carry 3 PCI slots, can be used as the carrier of data acquisition and FEEDBACK CONTROL software; Analog-to-digital conversion card (A/D) 13 adopts integrated card with digital-to-analogue conversion card (D/A) 15, model is APC～1612, it has the function of A/D and D/A concurrently, 12 bit map precision, the highest sample frequency is 33KHz, be inserted in the PCI slot of universal industrial control computer 14, its analog input end is connected with the voltage output end of charge amplifier 12, and analog output is connected with the current signal input of power amplifier 12; Charge amplifier 12, selecting model for use is YE5857, the charge signal output of acceleration transducer 3 (perceptron) is connected with the charge signal input of charge amplifier 12, the voltage output end of charge amplifier 12 will be exported the voltage signal of representing acceleration signal like this, this signal is inserted the analog input end of analog-to-digital conversion card (A/D) 13; Acceleration transducer 3 (perceptron), selecting model for use is CA-YD-106, is fixed on boring bar by dowel screw and overhangs on the front end face of part 4, its output is connected with the charge signal input of charge amplifier 12; Power amplifier 12, selecting model for use is TS5870, and its power output can reach 75 watts, and the response frequency scope is 10～10KHz, its current signal input links to each other with the analog output of digital-to-analogue conversion card 15, but its current signal output end is connected with the magnet exciting coil 8 of the magnetorheological actuator 1 that shakes simultaneously.
As shown in Figure 3, the control system operation principle can be expressed as follows: at first collect the instant dynamic characteristic signal of boring processing by the boring bar acceleration transducer 3 (perceptron) that disposes on the front end face of part 5 that overhangs, carry out signal through charge amplifier 12 then and amplify, then carry out A/D conversion back input universal industrial control computer 14 by 13 pairs of amplifying signals of analog-to-digital conversion card; Next is handled by 14 pairs of signals of being gathered of universal industrial control computer that Digital Signal Processing software is housed and judges whether boring bar 2 had the flutter generation or be not about to produce flutter this moment, judge and finish back decision solution, outputing control signals to digital-to-analogue conversion card 15 simultaneously carries out D/A and is transformed into current signal, carry out power amplification by 16 pairs of current signals of power amplifier then, but input to the magnetorheological actuator 1 that shakes of intelligent boring bar at last.But the magnetorheological actuator 1 that shakes is after obtaining current signal, the magnetic field that magnet exciting coil 8 on its solenoid housing 7 just produces respective strengths, when magnetic flow liquid 9 is radially passed in magnetic field, magnetic rheology effect will take place magnetic flow liquid 9 changes itself characteristic such as apparent viscosity, Young's modulus etc., finally reach the purpose that changes boring bar 2 dynamic characteristics, make the intrinsic frequency of boring bar 2 can in time avoid the flutter frequency district, thereby the flutter that effectively suppresses boring bar 2 in the bore hole process take place.
Claims (2)
1, a kind of vibration self-suppressed intelligent boring bar component based on magnetic flow liquid, it is characterized in that: it comprises boring bar (2), acceleration transducer (3), boring bar member clamping part (4), the boring bar part (5) that overhangs, sealing ring (6), solenoid housing (7), magnet exciting coil (8), magnetic flow liquid (9), support set (10), end cap (11); The solenoid housing (7) of coiling magnet exciting coil (8) is housed on the boring bar of boring bar member clamping part (4); Form in the cavity volume that connects between cylindrical hole and the boring bar (2) in solenoid housing (7) magnetic flow liquid (9) is housed, sealing ring (6) sealing is used at the cavity volume two ends respectively; In solenoid housing (7) outside support set (10) is housed, and loads onto end cap (11) at the front end of support set (10); But above structure constitutes the magnetorheological actuator that shakes (1); Boring bar overhang the part (5) front end face on acceleration transducer (3) is housed, the charge amplifier of acceleration transducer (3) connected control system (17), the power amplifier (16) of magnet exciting coil (8) connected control system (17).
2, a kind of vibration self-suppressed intelligent boring bar component according to claim 1 based on magnetic flow liquid, it is characterized in that: described control system (17) comprises charge amplifier (12), A/D analog-to-digital conversion card (13), D/A digital-to-analogue conversion card (15) and power amplifier (16); Being fixed on the overhang output of the acceleration transducer (3) of part on (5) front end face of boring bar is connected with the input of charge amplifier (12), the input of A/D analog-to-digital conversion card (13) is connected with the output of charge amplifier (12), universal industrial control computer (14) is connected by the PCI slot with the output of A/D analog-to-digital conversion card (13), the input of D/A digital-to-analogue conversion card (15) is connected with the PCI slot of universal industrial control computer (14), the input of power amplifier (16) is connected with the output of D/A digital-to-analogue conversion card (15), but magnet exciting coil (8) input of the magnetorheological actuator that shakes (1) is connected with the output of power amplifier (16).
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| CNB2005100621794A CN100355521C (en) | 2005-12-23 | 2005-12-23 | Vibration self-suppressed intelligent boring bar component based on magnetorheological fluid |
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| CNB2005100621794A CN100355521C (en) | 2005-12-23 | 2005-12-23 | Vibration self-suppressed intelligent boring bar component based on magnetorheological fluid |
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Cited By (9)
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| CN102275086A (en) * | 2011-08-04 | 2011-12-14 | 中国科学院过程工程研究所 | Damping vibration absorbing cutter bar |
| CN104043849A (en) * | 2013-03-12 | 2014-09-17 | 安加实业股份有限公司 | Precise boring bar for processing special-shaped hole and numerical boring machine using precise boring bar |
| CN108857555A (en) * | 2018-09-04 | 2018-11-23 | 衢州学院 | The Method For Suppressing Cutting Chatter of variable damping variation rigidity knife rest based on magnetorheological fluid |
| CN111503216A (en) * | 2020-03-30 | 2020-08-07 | 中国科学院地质与地球物理研究所 | Self-adjusting damping shock absorber for drilling instrument and adjusting method thereof |
| CN113543912A (en) * | 2019-04-11 | 2021-10-22 | 西铁城时计株式会社 | Machine tool and sensing method |
| US11274542B2 (en) | 2020-03-30 | 2022-03-15 | Institute Of Geology And Geophysics, Chinese Academy Of Sciences | Self-adjusting damping vibration absorber for while-drilling instruments and adjusting method thereof |
| CN114535631A (en) * | 2022-04-01 | 2022-05-27 | 哈尔滨理工大学 | Variable-rigidity variable-damping magnetorheological fluid vibration damping boring rod |
| CN116201842A (en) * | 2023-03-07 | 2023-06-02 | 哈尔滨理工大学 | Active self-adaptive variable-rigidity shock absorber and vibration reduction boring bar |
| CN116673509A (en) * | 2023-05-05 | 2023-09-01 | 哈尔滨理工大学 | Vibration-damping boring bar with built-in magnetorheological elastomer |
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| CN87214285U (en) * | 1987-10-12 | 1988-06-08 | 许卫星 | Vibration-eliminating boring lever |
| JPH0631508A (en) * | 1992-07-16 | 1994-02-08 | Mitsubishi Materials Corp | Turning tool |
| US6443673B1 (en) * | 2000-01-20 | 2002-09-03 | Kennametal Inc. | Tunable boring bar for suppressing vibrations and method thereof |
| CN1128040C (en) * | 2001-12-19 | 2003-11-19 | 北京工业大学 | Intelligent in-situ machine tool cutting flutter controlling method and system |
| JP2004270719A (en) * | 2003-03-05 | 2004-09-30 | Bando Chem Ind Ltd | Adjustable damping force type damper |
| CN2845980Y (en) * | 2005-12-23 | 2006-12-13 | 浙江大学 | Self control vibration intelligent boring rod member based on magnetic rheological liquid |
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- 2005-12-23 CN CNB2005100621794A patent/CN100355521C/en not_active Expired - Fee Related
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| CN102275086A (en) * | 2011-08-04 | 2011-12-14 | 中国科学院过程工程研究所 | Damping vibration absorbing cutter bar |
| CN104043849A (en) * | 2013-03-12 | 2014-09-17 | 安加实业股份有限公司 | Precise boring bar for processing special-shaped hole and numerical boring machine using precise boring bar |
| CN104043849B (en) * | 2013-03-12 | 2017-04-26 | 安加实业股份有限公司 | Precise boring bar for processing special-shaped hole and numerical boring machine using precise boring bar |
| CN108857555A (en) * | 2018-09-04 | 2018-11-23 | 衢州学院 | The Method For Suppressing Cutting Chatter of variable damping variation rigidity knife rest based on magnetorheological fluid |
| CN113543912A (en) * | 2019-04-11 | 2021-10-22 | 西铁城时计株式会社 | Machine tool and sensing method |
| CN113543912B (en) * | 2019-04-11 | 2023-12-26 | 西铁城时计株式会社 | Machine tool and sensing method |
| US11274542B2 (en) | 2020-03-30 | 2022-03-15 | Institute Of Geology And Geophysics, Chinese Academy Of Sciences | Self-adjusting damping vibration absorber for while-drilling instruments and adjusting method thereof |
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| CN111503216B (en) * | 2020-03-30 | 2021-03-30 | 中国科学院地质与地球物理研究所 | Self-adjusting damping shock absorber for drilling instrument and adjusting method thereof |
| CN111503216A (en) * | 2020-03-30 | 2020-08-07 | 中国科学院地质与地球物理研究所 | Self-adjusting damping shock absorber for drilling instrument and adjusting method thereof |
| CN114535631A (en) * | 2022-04-01 | 2022-05-27 | 哈尔滨理工大学 | Variable-rigidity variable-damping magnetorheological fluid vibration damping boring rod |
| CN114535631B (en) * | 2022-04-01 | 2022-10-11 | 哈尔滨理工大学 | Variable-rigidity variable-damping magnetorheological fluid vibration damping boring rod |
| CN116201842A (en) * | 2023-03-07 | 2023-06-02 | 哈尔滨理工大学 | Active self-adaptive variable-rigidity shock absorber and vibration reduction boring bar |
| CN116201842B (en) * | 2023-03-07 | 2023-09-15 | 哈尔滨理工大学 | Active self-adaptive variable-rigidity shock absorber and vibration reduction boring bar |
| CN116673509A (en) * | 2023-05-05 | 2023-09-01 | 哈尔滨理工大学 | Vibration-damping boring bar with built-in magnetorheological elastomer |
| CN116673509B (en) * | 2023-05-05 | 2024-05-28 | 哈尔滨理工大学 | Vibration-damping boring bar with built-in magnetorheological elastomer |
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