CN108857555A - The Method For Suppressing Cutting Chatter of variable damping variation rigidity knife rest based on magnetorheological fluid - Google Patents
The Method For Suppressing Cutting Chatter of variable damping variation rigidity knife rest based on magnetorheological fluid Download PDFInfo
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- CN108857555A CN108857555A CN201811026191.3A CN201811026191A CN108857555A CN 108857555 A CN108857555 A CN 108857555A CN 201811026191 A CN201811026191 A CN 201811026191A CN 108857555 A CN108857555 A CN 108857555A
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- Prior art keywords
- magnetorheological fluid
- knife rest
- variable damping
- variation rigidity
- cutting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
- B23Q11/0039—Arrangements for preventing or isolating vibrations in parts of the machine by changing the natural frequency of the system or by continuously changing the frequency of the force which causes the vibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The Method For Suppressing Cutting Chatter of the present invention provides a kind of variable damping variation rigidity knife rest based on magnetorheological fluid, belongs to technical field.Based on the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest of magnetorheological fluid, variable damping variation rigidity knife rest based on magnetorheological fluid includes mounting rack, magnetorheological fluid actuator, accelerometer and controller are provided on mounting rack, magnetorheological fluid actuator includes cylinder body, magnetorheological fluid, piston, connecting rod and magnet exciting coil；The Method For Suppressing Cutting Chatter comprises the steps of：A information collection；B information analysis；C information feedback；The magnetic responsiveness characteristic of d magnetorheological fluid；E Flutter Suppression.The present invention makes metal cutting be in preferable Flutter Suppression state with that can destroy cutting-vibration Production conditions.
Description
Technical field
The invention belongs to cutting technology field, the cutting for being related to a kind of variable damping variation rigidity knife rest based on magnetorheological fluid is quivered
Shake suppressing method.
Background technique
Fierce self-excited vibration can usually occur in metal cutting process, between cutter and workpiece, i.e., it is so-called
Flutter, this will lead to the reduction of Precision Machining efficiency and machined surface quality decline or even defective work piece and cutter, after causing seriously
Fruit, therefore, it is necessary to quickly and effectively be inhibited to processing flutter, to improve tool surfaces processing quality.To metal cutting
The control strategy of flutter mainly has two major classes：One kind is cutting parameter adjusting method, that is, passes through selection or the reasonable cutting ginseng of adjustment
Number is so that machine tool system is in stable region；Second class is vibration control method, i.e., changes the performance of system by vibration control method
Flutter is avoided with amendment boundary of stability.
Currently, people have developed a kind of intelligent milling electro spindle, active cutting-vibration inhibits system and method online,
Through retrieving, as Chinese patent literature discloses a kind of intelligent milling electro spindle, active cutting-vibration inhibits system and method online
【The patent No.：ZL201610311493.X；Authorization Notice No.：CN106392753B】.This system includes sequentially connected sensing
Partially, controller and Flutter Suppression regulation device；Transducing part includes being mounted on front-end of spindle for measuring main shaft radial direction position
The non-contact electric eddy shift sensor of shifting, the displacement signal for acquiring eddy current displacement sensor simultaneously turn displacement signal
It is changed to the signal picker of acceleration signal；Controller is used for the acceleration signal exported according to signal picker, output control
Voltage signal is to Flutter Suppression regulation device；Flutter Suppression regulation device includes power amplifier and active electric magnetic bearing；It is main
Dynamic formula electromagnetic bearing includes rotor core and stator core；Rotor core is mounted on the front end of main shaft；Copper is wound in stator core
Coil；Power amplifier is used to be converted to the voltage signal received control current signal, and output end connects with copper coil respectively
It connects.The method includes the identification of flutter in process and inhibition.
But for most of machine tool systems, since the rotary inertia of its transmission system is bigger, response characteristic
Relatively low, this makes Suppression of Chatter in Metal Cutting with Varying Spindle Speed be difficult to realize biggish velocity variable and change rate.In addition, working as the dynamic stiffness of machine tool system
When very low, Suppression of Chatter in Metal Cutting with Varying Spindle Speed can not only inhibit flutter, or even flutter can be made to aggravate.It can be seen that Suppression of Chatter in Metal Cutting with Varying Spindle Speed method inhibits flutter
Certain limitation is also suffered from practical applications.Such as with intellectual material：Electric (magnetic) rheology liquid, magnetostriction materials, shape
The rapid development of memorial alloy, piezoelectric polymeric materials etc., they are introduced in Flutter Suppression field, achieve good
Inhibition of vibration.The damping of magnetorheological fluid, rigidity can rapidly, continuously change with the variation of externally-applied magnetic field, and the variation is reversible
, this has very big advantage for machining vibration suppression, therefore, using the semi- active control based on magnetorheological fluid
Method realizes Flutter Suppression.
Summary of the invention
The purpose of the present invention is there is the above problem in view of the prior art, a kind of variable resistance based on magnetorheological fluid is proposed
The Method For Suppressing Cutting Chatter of Buddhist nun's variation rigidity knife rest, have can destroy cutting-vibration Production conditions, make metal cutting be in compared with
Good Flutter Suppression state.
Object of the invention can be realized by the following technical scheme：
A kind of Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest based on magnetorheological fluid, which is characterized in that described
The variable damping variation rigidity knife rest based on magnetorheological fluid include mounting rack, be provided on the mounting rack magnetorheological fluid execution
Device, accelerometer and controller, the magnetorheological fluid actuator include cylinder body, magnetorheological fluid, piston, connecting rod and magnet exciting coil；
The Method For Suppressing Cutting Chatter comprises the steps of：
A information collection：The Vibration Condition of cutter is acquired in real time using accelerometer as inductor；
B information analysis：And amplify the vibration information of acquisition, and vibration signal is transferred in collection analysis module, lead to
It crosses calculating analysis and cutting state is fed back to controller；
C information feedback：Controller output control signal controls exciting current, adjusts input to magnet exciting coil in real time
Electric current；
D magnetorheological fluid magnetic responsiveness：The rigidity of magnetorheological fluid damps under the action of externally-applied magnetic field, and continuous reversible occurs
Variation；
E Flutter Suppression：So that the vibration of cutter is avoided the intrinsic frequency with cutting system, destroys the condition of flutter formation.
According to control signal, appropriate electric current is inputted to magnet exciting coil, the continuous magnet exciting coil that changes is added on magnetorheological fluid
Magnetic field strength, due to the magnetic responsiveness characteristic of magnetorheological fluid, i.e., the rigidity of magnetorheological fluid, damping externally-applied magnetic field effect
Under, the variation of continuous reversible occurs, such as：As magnetic field strength applies, magnetorheological fluid can be within the time of Millisecond by liquid
Become solid-state, remove magnetic field, magnetorheological fluid becomes liquid again from solid-state again.The rigidity of magnetic rheological liquid damper and damping also have occurred
Consecutive variations, the variation of stiffness and damping so that corresponding variation also has occurred in the rigidity of entire cutting processing system and damping,
The intrinsic frequency of cutting processing system changes correspondingly, prevent the vibration frequency of cutter and the intrinsic frequency of cutting system are from continuing
It is close, the accumulation of resonance energy is avoided, the condition of flutter formation is destroyed, to reach cutting-vibration inhibition.
In the Method For Suppressing Cutting Chatter of the above-mentioned variable damping variation rigidity knife rest based on magnetorheological fluid, described is magnetorheological
Liquid is flowed into cylinder body, is sealed with the end cover after cylinder body filling magnetorheological fluid, and end cap uses thread connecting mode and cylinder body
Connection.
In the Method For Suppressing Cutting Chatter of the above-mentioned variable damping variation rigidity knife rest based on magnetorheological fluid, in the cylinder body
Full of magnetorheological fluid, stayed at the piston there are two throttle orifice.
In the Method For Suppressing Cutting Chatter of the above-mentioned variable damping variation rigidity knife rest based on magnetorheological fluid, the connecting rod
One end is fixedly connected with cutter, and the other end of connecting rod is fixed on piston.
In the Method For Suppressing Cutting Chatter of the above-mentioned variable damping variation rigidity knife rest based on magnetorheological fluid, described is magnetorheological
The operating mode of liquid is the mixed mode squeezed with shearing.Using it, elasticity modulus and magnetorheological fluid are lost under magnetic rheology effect
Characteristic that the factor changes with change of magnetic field strength changes support stiffness and damping characteristic.
It is described to excitation in the Method For Suppressing Cutting Chatter of the above-mentioned variable damping variation rigidity knife rest based on magnetorheological fluid
The electric current of coil input is used to be controlled from the sine wave or triangular current of frequency or amplitude.
Compared with prior art, have based on the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest of magnetorheological fluid
Following advantages：
Magnetorheological fluid can make by adjusting the size of applied field strengths its physical characteristic obtain quick (Millisecond), continuous
The characteristics of variation and change procedure is reversible, can make the dynamic characteristic of cutting be in best by applying magnetic field intensity signal
Flutter Suppression state, this has apparent advantage compared with existing change speed of mainshaft vibration suppression method, not big by main shaft rotary inertia
Small limitation, the occasion that should not continuously change suitable for the speed of mainshaft；Meanwhile compared with other existing Flutter Suppression methods,
Variation rigidity proposed by the invention, variable damping vibration suppression method vibration suppression more it is direct effectively, can effectively inhibit to process flutter, improve processing
Efficiency and workpiece surface machining accuracy.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is the structural schematic diagram of intermediate slide of the present invention.
In figure, 1, workpiece；2, cutter；3, accelerometer；4, connecting rod；5, cylinder body；6, magnetorheological fluid；7, piston；8, excitation
Coil.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
As depicted in figs. 1 and 2, a kind of Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest based on magnetorheological fluid 6,
Variable damping variation rigidity knife rest based on magnetorheological fluid 6 includes mounting rack, and 6 actuator of magnetorheological fluid is provided on institute's mounting rack, is added
Speedometer 3 and controller, 6 actuator of magnetorheological fluid include cylinder body 5, magnetorheological fluid 6, piston 7, connecting rod 4 and magnet exciting coil 8.Magnetic
Rheology liquid 6 is flowed into cylinder body 5, and cylinder body 5 is sealed with the end cover after filling magnetorheological fluid 6, and end cap uses threaded connection side
Formula is connect with cylinder body 5.It is full of magnetorheological fluid 6 in cylinder body 5, stays that there are two throttle orifices at the piston 7.One end of connecting rod 4 and knife
Tool 2 is fixedly connected, and the other end of connecting rod is fixed on piston 7.
The Method For Suppressing Cutting Chatter comprises the steps of：
A information collection：The Vibration Condition of cutter 2 is acquired in real time using accelerometer 3 as inductor；
B information analysis：And amplify the vibration information of acquisition, and vibration signal is transferred in collection analysis module, lead to
It crosses calculating analysis and cutting state is fed back to controller；
C information feedback：Controller output control signal controls exciting current, adjusts in real time defeated to magnet exciting coil 8
The electric current entered uses from the sine wave or triangular current of frequency or amplitude the electric current that magnet exciting coil 8 inputs and controls；
6 magnetic responsiveness of d magnetorheological fluid：The rigidity of magnetorheological fluid 6 damps under the action of externally-applied magnetic field, and generation continuously may be used
Inverse variation；
E Flutter Suppression：So that the vibration of cutter 2 is avoided the intrinsic frequency with cutting system, destroys the condition of flutter formation.
According to control signal, appropriate electric current is inputted to magnet exciting coil 8, the continuous magnet exciting coil 8 that changes is added in magnetorheological fluid 6
On magnetic field strength, due to the magnetic responsiveness characteristic of magnetorheological fluid 6, i.e., the rigidity of magnetorheological fluid 6, damping externally-applied magnetic field work
Under, the variation of continuous reversible occurs, such as：As magnetic field strength applies, magnetorheological fluid 6 can be within the time of Millisecond by liquid
State becomes solid-state, removes magnetic field, and magnetorheological fluid 6 becomes liquid again from solid-state again.The rigidity of 6 damper of magnetorheological fluid and damping are also sent out
Consecutive variations are given birth to, the variation of stiffness and damping is so that corresponding change also has occurred in the rigidity of entire cutting processing system and damping
Change, the intrinsic frequency of cutting processing system changes correspondingly, prevent the vibration frequency of cutter 2 and the intrinsic frequency of cutting system from
It is lasting close, the accumulation of resonance energy is avoided, the condition of flutter formation is destroyed, to reach cutting-vibration inhibition.
Magnetorheological fluid 6 is flowed into cylinder body 5, and cylinder body 5 is sealed with the end cover after filling magnetorheological fluid 6, and end cap uses
Thread connecting mode is connect with cylinder body 5.It is full of magnetorheological fluid 6 in cylinder body 5, stays that there are two throttle orifices at the piston 7.Connecting rod 4
One end be fixedly connected with cutter 2, the other end of connecting rod is fixed on piston 7.
The operating mode of magnetorheological fluid 6 is the mixed mode squeezed with shearing.Using it under magnetic rheology effect springform
Amount and the characteristic that changes with change of magnetic field strength of 6 fissipation factor of magnetorheological fluid change support stiffness and damping characteristic.To encouraging
The electric current that magnetic coil 8 inputs is used and is controlled from the sine wave or triangular current of frequency or amplitude.
In summary, magnetorheological fluid 6 can make its physical characteristic obtain quickly (milli by adjusting the size of applied field strengths
Second grade), consecutive variations the characteristics of and the change procedure be reversible, the dynamic of cutting can be made special by applying magnetic field intensity signal
Property be in optimal Flutter Suppression state, this has apparent advantage compared with existing change speed of mainshaft vibration suppression method, not by main shaft
The limitation of rotary inertia size, the occasion that should not continuously change suitable for the speed of mainshaft；Meanwhile with other existing Flutter Suppression sides
Method compares, variation rigidity proposed by the invention, variable damping vibration suppression method vibration suppression more it is direct effectively, can effectively inhibit processing to quiver
Vibration improves processing efficiency and 1 surface processing accuracy of workpiece.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although 1, workpiece is used more herein；2, cutter；3, accelerometer；4, connecting rod；5, cylinder body；6, magnetorheological
Liquid；7, piston；8, the terms such as magnet exciting coil, but it does not exclude the possibility of using other terms.It is only using these terms
In order to be more convenient to describe and explain essence of the invention；Being construed as any additional limitation all is and the present invention
What spirit was disagreed.
Claims (6)
1. a kind of Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest based on magnetorheological fluid, which is characterized in that described
Variable damping variation rigidity knife rest based on magnetorheological fluid includes mounting rack, be provided on the mounting rack magnetorheological fluid actuator,
Accelerometer and controller, the magnetorheological fluid actuator include cylinder body, magnetorheological fluid, piston, connecting rod and magnet exciting coil；
The Method For Suppressing Cutting Chatter comprises the steps of：
A information collection：The Vibration Condition of cutter is acquired in real time using accelerometer as inductor；
B information analysis：And amplify the vibration information of acquisition, and vibration signal is transferred in collection analysis module, pass through meter
Cutting state is fed back to controller by point counting analysis；
C information feedback：Controller output control signal controls exciting current, adjusts the electricity inputted to magnet exciting coil in real time
Stream；
D magnetorheological fluid magnetic field is rung：The rigidity of magnetorheological fluid damps under the action of externally-applied magnetic field, and the variation of continuous reversible occurs；
E Flutter Suppression：So that the vibration of cutter is avoided the intrinsic frequency with cutting system, destroys the condition of flutter formation.
2. the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest according to claim 1 based on magnetorheological fluid,
It is characterized in that, the magnetorheological fluid is flowed into cylinder body, is sealed with the end cover after cylinder body filling magnetorheological fluid, and end cap is adopted
Mode is threadedly coupled to connect with cylinder body.
3. the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest according to claim 2 based on magnetorheological fluid,
It is characterized in that, magnetorheological fluid is full of in the cylinder body, stay that there are two throttle orifices at the piston.
4. the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest according to claim 1 based on magnetorheological fluid,
It is characterized in that, one end of the connecting rod is fixedly connected with cutter, and the other end of connecting rod is fixed on piston.
5. the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest according to claim 1 based on magnetorheological fluid,
It is characterized in that, the operating mode of the magnetorheological fluid is the mixed mode squeezed with shearing.
6. the Method For Suppressing Cutting Chatter of the variable damping variation rigidity knife rest according to claim 1 based on magnetorheological fluid,
It is characterized in that, the current parameters to magnet exciting coil input are controlled from the sine wave or triangular current of frequency or amplitude
System.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676582A (en) * | 2021-01-11 | 2021-04-20 | 江苏省特种设备安全监督检验研究院 | Cutting chatter suppression method of variable-damping variable-stiffness milling tool rest based on magnetorheological fluid |
| CN113369968A (en) * | 2021-04-30 | 2021-09-10 | 西安交通大学 | Damping device and method for inhibiting cutting vibration of machine tool spindle and machine tool spindle |
| FR3115224A1 (en) * | 2020-10-15 | 2022-04-22 | Tacquet Industries | Intelligent fluid damper for a portable processing machine |
| CN114776760A (en) * | 2022-04-14 | 2022-07-22 | 大连理工大学 | Thin-wall part magneto-rheological vibration suppression method based on S-ADRC controller |
| CN117167428A (en) * | 2023-11-01 | 2023-12-05 | 南京航空航天大学 | Variable damping vibration attenuation device for industrial robot cutting machining and vibration attenuation method thereof |
| CN117259868A (en) * | 2023-11-24 | 2023-12-22 | 山东威腾机械有限公司 | Cutting device for bearing seat of wind power generator |
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Cited By (9)
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| CN117259868A (en) * | 2023-11-24 | 2023-12-22 | 山东威腾机械有限公司 | Cutting device for bearing seat of wind power generator |
| CN117259868B (en) * | 2023-11-24 | 2024-02-13 | 山东威腾机械有限公司 | Cutting device for bearing seat of wind power generator |
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