CN101839302B - Elastic support and dry friction tuned mass damper for controlling cutting chatter - Google Patents
Elastic support and dry friction tuned mass damper for controlling cutting chatter Download PDFInfo
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- CN101839302B CN101839302B CN2010101862356A CN201010186235A CN101839302B CN 101839302 B CN101839302 B CN 101839302B CN 2010101862356 A CN2010101862356 A CN 2010101862356A CN 201010186235 A CN201010186235 A CN 201010186235A CN 101839302 B CN101839302 B CN 101839302B
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Abstract
用于切削颤振控制的弹性支承干摩擦调谐质量阻尼器属于机械技术领域，涉及一种抑制切削加工颤振的阻尼器结构。阻尼器振子(3)悬臂弹性梁(2)固定于被控对象上，并且位置可调；基座(1)上还设置有悬臂形的双层弹性摩擦片(5)，双层弹性摩擦片(5)的一端通过柔性铰链结构(7)与基座(1)连接，另一端与阻尼器振子(3)上表面相接触，设有可调节两层弹性片之间距离的调整螺钉(6)，通过调整螺钉(6)可调双层弹性摩擦片(5)整施加在阻尼器振子上的接触压力。本发明通过阻尼器振子阻尼振动和滑动摩擦两种方式进行振动抑制；并使被控机械结构的频率响应函数最大负实部最小，从而最大限度地提高切削系统最大稳定极限切削深度。在最大限度地提高切削效率的同时，避免切削颤振的发生。
An elastically supported dry friction tuned mass damper for cutting chatter control belongs to the technical field of machinery and relates to a damper structure for suppressing cutting chatter. The damper vibrator (3) cantilever elastic beam (2) is fixed on the controlled object, and its position is adjustable; the base (1) is also provided with a cantilever-shaped double-layer elastic friction plate (5), and the double-layer elastic friction plate One end of (5) is connected to the base (1) through a flexible hinge structure (7), and the other end is in contact with the upper surface of the damper vibrator (3), and an adjustment screw (6) is provided to adjust the distance between the two elastic sheets ), adjust the contact pressure on the damper vibrator by adjusting the double-layer elastic friction plate (5) through the adjustment screw (6). The present invention suppresses vibration through vibration damping and sliding friction of the damper vibrator; and minimizes the maximum negative real part of the frequency response function of the controlled mechanical structure, thereby maximally improving the cutting depth of the maximum stability limit of the cutting system. While maximizing cutting efficiency, avoid cutting chatter.
Description
Technical field
The invention belongs to field of mechanical technique, relate to a kind of damper structure that suppresses the cutting flutter.
Background technique
Metal cutting flutter (Machining chatter) belongs to self-excited vibration, is ferocious relative vibration between the cutter that produces in working angles of metal-cutting machine tool and the workpiece.Cutting-vibration reduces quality of product, manufacturing efficiency, cutter and lathe working life, causes noise pollution simultaneously, influences operator's physical and mental health.Along with the factory automation development, the operator is day by day away from processing site, the appearance that often can not fundamentally stop the flutter phenomenon by the method for flutter prevention and control is so the task that cutting-vibration is carried out in-service monitoring and control becomes more and more urgent, more and more meaningful.
The Flutter Control method of present comparative maturity, but be to reach the effect that vibration damping shakes by in system, adding the damping shock absorption parts.The kind of damper is a lot, includes tuned mass damper, liquid damping (orchid is taken along Si Te) bump leveller, impact damping bump leveller and frcition damper etc.Impact damper is made up of impact block and dampening chamber's two-part.Dampening chamber is vibrated with controlled mechanical structure, and the drive impact block is beated in dampening chamber, there is certain clearance between damping block and the dampening chamber, gap length will design proper, when making opportunity of impact block and dampening chamber inwall bump just be in both reverse motions, only in this way, the energy loss of impact just helps and suppresses vibration.EDHI, E have proposed the method that a frcition damper is controlled flutter in the boring process.Main structure is that a mass block and a permanent magnet are combined, and mass block is connected on the main structure, and the direction that direction and flutter take place parallels, and is pad in the middle of permanent magnet and the mass block, comes the amplitude of controlling magnetic field power with it.Can be higher than 10 with solving frequency, the flutter of 000Hz.
Tuned mass damper is the most frequently used damper structure, and it is that associated mass is linked to each other with main vibrating system with elastic element by damping member, and the kinergety that is converted to associated mass by the vibrational energy with main vibrating system suppresses the vibration of main vibrating system.Eugene I etc. has designed adjustable dynamic damping bump leveller, can by adjust its elastic element, damping member reaches shock absorption system and main vibrating system is complementary, and guarantees that when main vibrating system dynamic characteristic changes bump leveller still is in optimum Working.
Summary of the invention
In order further to improve the Flutter Suppression effect of damper, the invention provides a kind of elastic support and dry friction tuned mass damper structure, it can carry out vibration suppression by damped vibration of damper oscillator and sliding friction dual mode simultaneously.
To achieve these goals, the present invention adopts following design proposal:
The elastic support and dry friction tuned mass damper that is used for cutting-vibration control, main body is the damper oscillator with the controlled device effect, it is characterized in that: the damper oscillator acts on the controlled device by the cantilever elastic beam of pedestal and template, this pedestal is fixed on the controlled device, the cantilever elastic beam is fixed on the pedestal, the damper oscillator is fixed on the cantilever elastic beam, and adjustable positions; Also be provided with the double-deck elastic-friction sheet of cantilever shape on the pedestal, one end of double-deck elastic-friction sheet is connected with pedestal 1 by flexible hinge structure 7, the other end contacts with damper oscillator upper surface, in double-deck elastic-friction sheet, one deck spring sheet that contacts with the damper oscillator is softer, another layer spring sheet is harder, and is provided with the adjustment screw of distance between the two-layer spring sheet of can regulate, by adjusting the whole contact pressure that is applied on the damper oscillator of screw adjustable double-layer elastic-friction sheet.
Described flexible hinge structure is that both sides are the connection pedestal of concave circular arc shape and the connecting sheet of double-deck elastic-friction sheet.
Described damper oscillator on the cantilever elastic beam the position and the size of flexible hinge structure according to the setting as a result of the maximum negative real part minimum of frequency response function of controlled mechanical structure.
The beneficial effect that the present invention has is: the present invention is by structural design and debugging, utilize the quality and the position on the cantilever elastic beam of damper oscillator, the flexible hinge structure that connects pedestal and damper oscillator, the sheet spacing of double-deck elastic-friction sheet, make the damper natural frequency, double-deck elastic-friction sheet frictional force size between the rigidity on the oscillator vibration direction and oscillator and friction plate surface of contact reaches optimum Match with the cutting system dynamic characteristic, make the maximum negative real part minimum of frequency response function of controlled mechanical structure, thereby improve cutting system maximum stable limit depth of cut to greatest extent.When being in cutting system under this kind state and can improving cutting rate to greatest extent, avoid the generation of cutting-vibration.
Description of drawings
The structural drawing of one preferred embodiment of Fig. 1 elastic support and dry friction tuned mass damper of the present invention;
The plan view of elastic support and dry friction tuned mass damper shown in Fig. 2 Fig. 1;
Elastic support and dry friction tuned mass damper scheme of installation among Fig. 3 embodiment;
Contain cutting system dynamic characteristic frequency characteristic amplitude-frequency and real figure frequently under two kinds of situations optimizing back elastic support and dry friction tuned mass damper and undamped device among Fig. 4 embodiment, wherein (a) is the frequency response function amplitude frequency diagram, (b) is the real figure frequently of frequency response function;
Under the identical machining condition among Fig. 5 embodiment, cutting vibration signal time-domain diagram and the cutting system working angles oscillating signal time-domain diagram of optimizing the back elastic support and dry friction tuned mass damper is housed during cutting system generation flutter that damper is not installed, wherein (a) is equipped with the elastic support and dry friction damper, (b) the undamped device.
Among the figure: 1, pedestal, 2, the cantilever elastic beam, 3, the damper oscillator, 4, screw, 5, double-deck elastic-friction sheet, 6, adjust screw, 7, the flexible hinge structure, 8, workpiece, 9, cutter, 10, the elastic support and dry friction damper.
Embodiment
Introduce a preferred embodiment of the present invention below in conjunction with Fig. 1～Fig. 5.
At first as Fig. 1, elastic support and dry friction damper 10 comprises the pedestal 1 that is fixed on the controlled device, be fixed on the cantilever elastic beam 2 on the pedestal 1, damper oscillator 3 is fixed on the cantilever elastic beam 2 by screw 4, other has cantilever to be fixed on double-deck elastic-friction sheet 5 on the pedestal 1, the outstanding end of double-deck elastic-friction sheet 5 contacts with damper oscillator upper surface, can be applied to damper oscillator 3 upward pressures by the amount of deformation adjustment of adjusting the double-deck spring sheet of screw 6 adjustings, to change frictional force size between oscillator and friction plate surface of contact, simultaneously double-deck elastic-friction sheet 5 has flexible hinge structure 7 its fixed end design with pedestal 1, as shown in Figure 2, it is two circular arcs that radius is R, two dome dot spacings are h, and these two parameters obtain according to controlled structural rigidity computation optimization.
Then according to shown in Figure 3, elastic support and dry friction damper 10 is fixed on the workpiece to be machined 8 on the milling machine table, adjust damper oscillator 3 position on cantilever elastic beam 2 by screw 4 and adjust the damper natural frequency, make the dynamic characteristic of workpiece on the x direction reach best by adjusting screw 6 adjusting frictional force, i.e. its maximum negative real part minimum.Do not have damper and the dynamic characteristic frequency response function amplitude of workpiece x direction of the elastic support and dry friction damper of adjusting 10 is housed and real part as shown in Figure 4.Can see that by Fig. 4 the elastic support and dry friction damper of adjusting 10 can be significantly with the negative real part of the maximum of hanging down the workpiece frequency response function.
After adjusting damper, 9 pairs of structures of the end mill tool material as shown in Figure 3 that adopts diameter 12mm is that the workpiece of metallic aluminium carries out Milling Process, cutting parameter is cutting-in 3mm radially, axial cutting-in 4mm, spindle speed 2400rpm, flutter does not take place in feed speed 0.24mm/s, working angles, and the cutting vibration acceleration signal of gathering in workpiece x direction is shown in Fig. 5 (a).
Keep same machining condition, after damper was removed, the cutting vibration acceleration signal that collects on the workpiece x direction was shown in Fig. 5 (b).
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101862356A CN101839302B (en) | 2010-05-21 | 2010-05-21 | Elastic support and dry friction tuned mass damper for controlling cutting chatter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101862356A CN101839302B (en) | 2010-05-21 | 2010-05-21 | Elastic support and dry friction tuned mass damper for controlling cutting chatter |
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| Publication Number | Publication Date |
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| CN101839302A CN101839302A (en) | 2010-09-22 |
| CN101839302B true CN101839302B (en) | 2011-12-07 |
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| CN2010101862356A Expired - Fee Related CN101839302B (en) | 2010-05-21 | 2010-05-21 | Elastic support and dry friction tuned mass damper for controlling cutting chatter |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248209B (en) * | 2011-07-01 | 2013-01-09 | 黑龙江科技学院 | Method for determining limit stable process parameter of machine tool in process of milling thin-wall complex curved surface workpiece |
| CN102418769B (en) * | 2011-09-22 | 2013-10-23 | 北京航空航天大学 | Stiffness/damping adjustable double cantilever beam sealed passive damper |
| EP3412407B1 (en) * | 2017-06-05 | 2020-01-01 | Ideko, S. Coop | Dynamically dampened centerless grinding machine tool and grinding method |
| CN112943833B (en) * | 2021-03-09 | 2022-10-21 | 国网陕西省电力公司电力科学研究院 | A kind of dynamic vibration absorber with automatic frequency regulation and its installation and regulation method |
| CN112922184B (en) * | 2021-03-22 | 2024-12-31 | 大连理工大学 | A TMD vibration reduction device with a working switch |
| CN118462544B (en) * | 2024-07-09 | 2024-09-03 | 淄博力侨真空科技有限公司 | Vacuum pump with heat dissipation and shock absorption device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539930A1 (en) * | 1991-10-31 | 1993-05-05 | Honeywell Inc. | Multiaxis isolation system |
| US5700116A (en) * | 1995-05-23 | 1997-12-23 | Design & Manufacturing Solutions, Inc. | Tuned damping system for suppressing vibrations during machining |
| CN201739422U (en) * | 2010-05-21 | 2011-02-09 | 北京工业大学 | Elastic supporting dry friction tuned mass damper used for cutting vibration control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756673B1 (en) * | 1994-04-18 | 1999-02-17 | Minnesota Mining And Manufacturing Company | Tuned mass damper |
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2010
- 2010-05-21 CN CN2010101862356A patent/CN101839302B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539930A1 (en) * | 1991-10-31 | 1993-05-05 | Honeywell Inc. | Multiaxis isolation system |
| US5700116A (en) * | 1995-05-23 | 1997-12-23 | Design & Manufacturing Solutions, Inc. | Tuned damping system for suppressing vibrations during machining |
| CN201739422U (en) * | 2010-05-21 | 2011-02-09 | 北京工业大学 | Elastic supporting dry friction tuned mass damper used for cutting vibration control |
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| CN101839302A (en) | 2010-09-22 |
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