JPH03207822A - Work vibration processing and device for carrying out said processing - Google Patents

Abstract

PURPOSE: To decrease the residual stresses in a work by executing the vibration excitation of the work by an electromechanical unbalance type vibration exciter until the bearing electromotive force value of a motor armature attains a specified value.

CONSTITUTION: The vibration treatment is executed by supplying electric power from a voltage transformer 3 to a DC motor 2 and applying vibration excitation on the work 14 by the electromechanical unbalance type vibration exciter 1. At this time, the value of the electromotive force of the bearing 10 of the motor armature 11 is inputted to an automatic stabilizer 6 of a motor speed via an amplifier 5, a meter 4, an arithmetic and logic unit 13 and a setter 12 of input voltage fluctuation intensity. When the value of the electromotive force stops changing, the stabilizer 6 tunes the excitation treatment of the vibration exciter 1 to the natural frequency of the work 14 via a converter 3 and executes the vibration excitation until the natural frequency attains the frequency at which the electromotive force remains constant and invariable. As a result, the residual stresses of the work 4 are decreased and warpage is prevented.

COPYRIGHT: (C)1991,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the treatment of metal workpieces, and more particularly to a method for vibration treatment of a workpiece and an apparatus for carrying out the method. The most advantageous field of application of the invention is in the control of the vibration treatment of cast or welded workpieces with the aim of reducing residual stresses in the workpiece. Another field of application of the invention is the control of the vibration treatment of cast or welded workpieces with the aim of reducing residual stresses in the workpiece. There may be control over the vibration treatment of the workpiece after die forging or bending in order to prevent warping of the workpiece. (b) Conventional Technology Welded or cast workpieces may be heated for a period of time after their manufacture. As time progresses, they tend to deform under the action of residual stresses. Even during their manufacture, the dimensions of the workpieces change between their finishing and assembly, so that the dimensions of the perfected products are not perfected for accuracy. The most effective result of vibration treatment is that the application of vibration treatment makes it possible to stabilize the geometric dimensions of the workpiece. can be achieved by the use of a resonant method, which treats the workpiece at its resonant frequency. Adequate efficiency of the resonant method is ensured by the high-amplitude oscillatory stresses generated within the workpiece, resulting in a substantial reduction of residual stresses. cause a decrease in

The equipment applied for vibration treatment differs in the type of vibration exciter used (the decisive parameter of which is the frequency range), and it It is classified as a device that incorporates a vibration exciter, an electromagnetic type (20 to 1000 Hg) vibration exciter, and an electrodynamic type (5 to 5000 Hg) vibration exciter. One of the important parameters that characterizes the vibration processing conditions is time. The desired processing time depends first of all on the size of the workpiece to be processed. However, there are currently no specific and well-specified recommended criteria for vibration treatment times. This is because such time depends not only on the size of the workpiece, but also on its structural characteristics, the level of residual stress within the workpiece and many other factors that are rarely considered. Generally, the length of processing time is determined empirically. In the current state of the art, vibration exciters are mounted through a clamp onto a workpiece that is electrically isolated from the workshop floor, thereby creating internal stresses that create vibrations in the workpiece. Vibration reduction methods are known (U.S. Pat. No. 3,622,
No. 404〉. The apparatus for carrying out the method comprises an unbalanced vibration exciter with a DC motor and a frequency regulator. Prior to processing the workpiece, a vibrational scan of the excitation frequency is performed to determine the resonant frequency. Once the resonance frequencies of 6 to 12 are determined, vibration processing is applied to 4 of the resonance frequencies.
It will be carried out at ~6. A sign of residual stress reduction is a 10-15% reduction in the current consumed by the motor during the vibration treatment. A disadvantage inherent in the known method and the device implementing the method is that the accuracy of measuring the reduction in residual stress and thus when the process is completed is too low. Control over the stabilization of residual stresses is made immediately during the processing process on the current consumed by the motor.
However, the measurement accuracy of current consumption is limited by energy losses, e.g. losses due to internal friction of the material of the workpiece, aerodynamic damping (losses due to sound emission into the surrounding atmosphere), electrical losses (losses due to eddy currents and electric currents). It is influenced by a number of factors related to losses in the shock absorber in which the workpiece is placed, as well as structural damping at the vibrator-to-workpiece interface (conductor-to-workpiece contact points). The energy losses mentioned above tend to vary within wide limits under the action of external uncontrollable factors. It is compared against a background of total energy loss exceeding . The closest analog to the method disclosed herein is a method for vibration treatment of workpieces with the aid of an electromechanical unbalanced vibration exciter connected to an electric motor (SU, ^, 798, 185
), this known method involves complex vibrational excitation of the workpiece at various harmonic resonant frequencies (mulli
ply) repeatedly, then weakening the applied vibratory displacements and vibrosotive forces;
The amplitude, phase, and frequency of the accompanying vibration excitation of the workpiece (
aIIplitude-phaee-frequenc
y> characteristic, and find the real part of the amplitude-one-phase-one-frequency characteristic (
real part ) and the process is completed when the zero-crossing point of the characteristic ceases shifting (this corresponds to stabilization of the workpiece frequency and thus of the residual stress). It has something to encourage you. The inherent disadvantage of known methods is the low precision of measuring the dynamics of the fluctuations of residual stresses and their stabilization. This is because the amplitude-one-phase-one-frequency characteristic of vibration excitation is
Signals of adjacent harmonics, noise disturbances and unknown
nted) This is because it is affected by vibration. The prior art device (SU, ^, 798, 185) for carrying out the above method for vibration treatment of workpieces consists of an electromechanical unbalanced vibration exciter connected to a variable speed electric motor, a voltage converter instrument, instrument (measuring in-s)
trtn+ent), two filters, a transducer for the vibration displacement of the workpiece connected to the input of the first filter, a multiplier, an instrument, a second filter and then the second filter of the multiplier. It is known that the multiplier comprises a force cell connected in series to the multiplier, the second input of this multiplier being connected to the output of the first filter and the output of the meter. There is. During operation, a vibration exciter induces mechanical vibrations within the workpiece and the frequency of the workpiece is varied to achieve tuning to resonance. The excitation frequency is
It can be changed using a voltage converter. A force cell is placed at the output of the vibration exciter and is adapted to generate an electrical signal proportional to the excitation force. Distortion of the excitation pulse is removed by a second filter. The response of a workpiece to an excitation applied to it is its vibrational displacement,
The phase for the vibration displacement signal with respect to the excitation force signal is measured by the vibration displacement transducer, and the distortion of the vibration displacement signal is removed by the first filter. An amplitude-phase-one-frequency characteristic is then established from the presentation provided by the transducer;
The intersection point of not only the real part of the above characteristics but also the real part of the amplitude-phase-frequency characteristic of the vibration excitation passing through the zero axis is measured, and as soon as the intersection point stops shifting, the vibration treatment process begins. is completed. An inherent disadvantage of the device is the lack of stabilization of motor speed and vibration exciter speed. This tends to disturb the conditions of resonance, distort the amplitude-phase-frequency characteristics of vibrational excitations, and also disturb the recording of the dynamics of residual stress fluctuations and the stabilization of those residual stresses. (c) Problems to be Solved by the Invention A vibration treatment method that can control the vibration effect by fully considering the dynamics of fluctuations in residual stress as a result of vibration treatment, and the effective implementation of the method. It is a fundamental and essential object of the present invention to provide a device for.

(2) Means for solving the problem The above purpose is achieved by the following facts. That is, with the help of an electromechanical unbalanced vibration exciter connected to an electric motor, the workpiece is processed at various harmonic workpiece resonant frequencies until the resonant frequency is stabilized. According to the present invention, in a method for vibration treatment of a workpiece that includes repeated vibration excitation of the object, the value of the electromotive force of the motor armature bearing is continuously measured during the vibration treatment, and the value of the electromotive force is measured continuously during the vibration treatment. The vibration exciter is tuned to resonance at the natural frequency of the workpiece shifted as a result of the vibration treatment, and the emf remains constant at a frequency when the value of stops changing. This is achieved by applying complex repeated vibrational excitations to each of the harmonics until the The generation mechanism of electromotive force in the bearings of an electric motor is based on the phenomenon of electromotive force induction in the case of asymmetric magnetic flux in the magnetic system of the circuit consisting of the shaft, bearings and motor frame. The motor armature shaft runs in bearings that are protected by a hydrodynamic oil film, the electrical resistance of which is responsible for the motor's operation.
ing cluty). When the bearings are electrically isolated from the motor frame, the emf is applied to the motor frame and bearing races.
ing race) across the electrical terminals. The hydrodynamic oil film condition depends on the reaction of the workpiece being transferred through the vibration exciter to the shaft of the motor armature while the emf value increases rapidly in the resonant mode. The ability to continuously record the force of the vibration action is due to the electromotive force of the bearing. A signal giving information about the electromotive force value in the bearing is used to control the vibration treatment process. Processing the workpiece in the resonant mode of the vibratory forces in the bearing makes it possible to take into account current changes in the resonant frequency due to the dynamics of the residual stresses.

The end of the procedure, which is based on the cessation of the electromotive force variation in the bearing, provides for a highly accurate recording of the moment of final stabilization of the residual stresses in the workpiece to be treated.

The vibration treatment is carried out at a stabilized vibration rate in a resonant mode, where the energy input into and absorbed by the workpiece causes a shorter course of time to reduce the residual stresses in the workpiece. Therefore, considerable savings in the energy consumed are maximized. The recording of the moment of final stabilization of the residual stresses in the workpiece and the end of the processing procedure makes it possible to exclude periods of vibration action that have no effect beyond the stabilization of the residual stresses. According to one embodiment of the invention, the vibration treatment is stopped during tuning of the vibration exciter. Such an embodiment of the invention makes it possible to use relatively simple equipment for carrying out the method of the invention. According to a preferred embodiment of the invention, the vibration treatment is carried out continuously during the entire vibration action process.

Such an embodiment of the invention makes it possible to completely automate the process of vibration treatment of the workpiece. The purpose is
This is also achieved by the following facts: That is,
In a device for the vibration treatment of a workpiece, which comprises an electromechanical unbalanced vibration exciter, a voltage converter and a meter, connected to a variable speed electric motor, according to the invention, an amplifier, an electric motor An automatic speed stabilizer of the motor and an angular velocity pick-up of the motor are also provided, one race of the electric motor bearing is electrically insulated from the motor frame, and an automatic speed stabilizer of the motor is provided. The input is connected to the motor armature winding via the motor angular velocity pickup and commutator, the output of the automatic motor speed stabilizer is connected to the input of the converter, and the instrument is connected to the output of the amplifier. is connected to
This is achieved by the fact that the input of the amplifier is connected to the motor frame and to the motor armature bearing race.

In a preferred embodiment of the invention, the input of the automatic motor speed stabilizer is a voltage fluctuation strength setter (s
etter ) and an arithmetic unit, the input of the automatic motor speed stabilization device being connected via the setter to the arithmetic unit, which subsequently receives data regarding the accompanying vibration treatment process of the workpiece. Connected to the meter and also to the output of the amplifier for launching.

Such embodiments of the present invention are effective for complete automation of the vibration treatment process of workpieces. Particular features and advantages of the invention will become more fully apparent from the following description of a few exemplary embodiments, given with reference to the accompanying drawings, in which: FIG.

<E> Embodiment According to the present invention, a method for vibration treatment of a workpiece consists of the following. A workpiece in which residual stress exists is subjected to vibrational excitation with the help of an electromechanical unbalanced vibration exciter connected to an electric motor, and the vibrational excitation of the workpiece is applied in various ways. Generated at the workpiece resonance frequency relative to the harmonics. The electromotive force value of the motor armature bearing is continuously measured during the vibration treatment process. The change in the emf value results from the reduction of the residual stress in the workpiece due to the vibration treatment of the workpiece. In each of the processing steps, the signal of the change in emf value is used to apply a vibration excitation to a set harmonic to provide resonance at the natural frequency of the workpiece that has been shifted as a result of the vibration treatment. The vibration frequency should be retuned. When the emf value stops changing for each harmonic, the vibration exciter is tuned at the frequency of the adjacent harmonic. The vibrational excitation is repeated step by step many times in succession until a frequency is reached at which the electromotive force value no longer changes. Automatically tuning the vibration exciter at the frequency of an adjacent harmonic between stages of processing at different harmonics or during continuous vibration processing of the workpiece. The apparatus for carrying out the method for vibration treatment of a workpiece includes an electromechanical unbalanced vibration exciter l (FIG. 1) connected to a variable speed electric motor 2, a voltage converter 3, a meter 4, an amplifier 5, It is equipped with an automatic speed stabilizing device 6 for the electric motor 2, a pick-up 7 for the angular velocity of the electric motor 2, a setter 12 for the strength of input voltage fluctuation of the automatic speed stabilizing device 6 for the electric motor 2, and an arithmetic unit W13.
One race 9 of the bearing 10 of the armature 11 is electrically insulated from the frame 8 of the motor 2. The input of the automatic speed stabilization device W6 is connected via a setter 12 to an arithmetic device 13, which in turn feeds an instrument 4 and an amplifier 5 for outputting data regarding the vibration treatment process of the workpiece. The input of the device 6 is also connected to the winding of the armature 11 of the motor 2 via the pickup 7 of the angular velocity of the motor 2 and the commutator 15, while the output of the device 6 is connected to the winding of the armature 11 of the motor 2. Connected to the input of converter 3. Instrument 4 is amplifier 5
, and the input of the amplifier 5 is connected via a terminal A to the frame 8 of the motor 2 and via a terminal B to the race 9 of the bearing IO of the armature 11 of the motor 2. The DC motor 2 is supplied with power from a voltage converter 3, and in its capacity is controlled to rectify the AC voltage at the commercial frequency and to control the DC (pulsating current) M current voltage U6 over a wide range. A rectifier is used. The controlled rectifier is a full-wave center-tapped circuit (a full-wave center-tap circuit).
assembled around the thyristor according to the center-tap circuit. The thyristor is powered by a power transformer, which provides decoupling of the motor circuit from the power mains and from the mains voltage.
tage) to a safe level for certain operating conditions. The pickup 7 is used to measure the current value of the angular velocity Ω of the motor 2. Its speed is determined by the tacho generator (taehogene) under the constant magnetic flux of the electric motor 2.
It is measured with the help of a tachometric bridge rather than by a tachometric bridge. An electromotive force T is induced across terminals C and D of the winding of the armature 11 of the motor 2, and the electromotive force T is determined from the following relationship. T = b - F・Ω (In the formula, b is the motor constant, F is the magnetic flux, and Ω is the angular rotational speed of the motor 2.) The input of the pickup 7 is connected to the terminals C and D of the motor 2. It has been done. Picked off from the output of pickup 7! The pressure is proportional to the value of T,
It is thus proportional to the speed Ω of the motor 2 under steady-state conditions. By applying the Big Atsua 7 to measure the rotational speed of the electric motor 2 instead of the commonly used tachogenerator, the structure of the electromechanical exciter is simplified and its operation is made more reliable. It comes to be. An automatic stabilization device 6 for the speed of the motor 2 is provided in case of extrinsic disturbing factors, such as fluctuations in the AC mains voltage, changes in the lubricant conditions in the motor 2, changes in mechanical and electrical losses in the motor 2. In this case, the set rotational speed of electric motor 2 is maintained. The application of negative feedback makes it possible to provide a linear characteristic of the converter 3 and subsequently widen the range of speed control of the motor 2. The device 6 is effectively a proportional and integral control device.
ortiona plus-integral con
troller) and a separate speed setting subunit (
a discrete speed setting
subunit) (Figure 2).

The control device has a resistor in its feedback circuit.
r) R + and capacitor)
Operational amplifier (oper+uiona) incorporating C
It is based on the following. The feedback of the control device is provided by resistors R 2 , R 3 in the speed setting circuit and by resistor R 4 in the speed feedback circuit of the motor 2 . The speed setting subunit is effectively a variable resistor R, connectable via a switch S1 to the stabilized DC source voltage Us. The slider of resistor R is connected to resistor R2. The setter 12 of the strength of the human voltage fluctuation of the device 6 is connected to the resistor R, via a switch S2, which means that when the switch S2 is closed, the switch S1 is opened and, conversely, the switch Sl is closed. It is mechanically interlocked with switch Sl so that switch S2 opens when it is closed. Setter for the strength of the input voltage fluctuation of the device 6
) 12 is adapted and attached to the device 6 for converting stepwise variations in voltage from the output of the computing device 13 into a voltage varying linearly with time. The level of the output voltage from the arithmetic device l3 after being reproduced by the intensity setter 12 reaches the level of the input voltage of the device 6. A linear variation of the voltage setter 12 from zero to a maximum value allows the motor 2 to be sped up with a constant acceleration, thereby recognizing the range of frequencies defined by the rotational speed of the motor 2. Application of the setter 12 facilitates transmission of vibration treatment at the natural frequency of the workpiece 14, and enables automation of the vibration treatment process. The computing device 13 makes it possible to automate the process of vibration treatment of the workpiece 14,
It is provided for flexible program control of the technical process of vibration treatment. Device l3 contains major routine elements specific to any computer system.
), that is, logic arithmetic units, storage devices, input/output devices, and control devices are incorporated.

The input/output device provides communication between the device 13 and the setter 12,
Communication is also established via the amplifier 5 with the terminal A on the frame 8 of the motor 2 and the terminal B of the bearing 10 which is electrically isolated from the frame 8 of the motor 2. A storage device arrives via an amplifier 5 from the bearing lO, which is electrically isolated from the frame 8 of the motor 2, and stores not only the value of the bearing emf applied to the device l3, but also the value of the output voltage of the setter 12. It is used for storing programs and recording information. The control device is adapted to decode the commands recorded in the program and generates signals for the functioning of the computing device.

In order to document the technique of vibration treatment of the workpiece 14, the resonant frequency of the vibration excitation is recorded and recorded by a recorder (not shown in the drawing) connected to the instrument 4. A DC motor supplied with power from the voltage converter 3 is used as the motor Z. The output of the converter 3 is connected to the winding of the armature l1 of the motor 2 via terminals C and D of the rectifier 15. The motor 2 has separate excitation voltages. When specifying the operating conditions of the electric motor 2 and analyzing the conditions for stable operation of the electric motor in combination with the vibration exciter 1, the relationship between the speed Ω of the electric motor 2 and the torque M of its shaft is used. It will be done. ! The mechanical properties of motive 2 are Ω. , which varies linearly with respect to the no-load angular velocity of the motor 2 (Fig. 3). Under the steady state condition of Ω - Ω1, the value of the torque M on the shaft of the motor 2 is the anti-torque moment M
Equal to the value of C. That is, M + = M? It is 1. Anti-torque moment M? The value of depends on the amount of vibration force resulting from the rotation of the axis of the vibration exciter 1 fixed on the workpiece 14. The frequency of vibration excitation is 1 of the natural frequency of the workpiece 14
When equal to , resonance begins and the vibrational force MC acquires its maximum value. When a deviation C from resonance occurs, the value of the vibration force M1 decreases and thus the antitorque moment (antitorque a+
o! +Ient) becomes lower than the value of M2 during the rotation of the motor shaft, while the angular velocity of the motor l12 increases to the value Ω=Ω2.

The reduction in the natural frequency of the processed workpiece due to vibration treatment results in a decrease in the value of the electromotive force. Prior to beginning vibration treatment of the workpiece 14, its resonant frequency should be determined. At that time, the speed value of the electric motor 2 corresponding to the resonance frequency is input to the storage device of the arithmetic unit 13. In order to carry out the vibration treatment, the vibration exciter is equipped with a clamp 16.
It should be fixed at a predetermined position on the workpiece 14 with the help of a. ! The rotational speed of motive 2 is varied to achieve mechanical resonance. That is, the vibration effect is exerted such that the vibration excitation frequency should be equal to one of the resonant frequencies of the workpiece 14 (as set by the rotational speed of the electric motor 2). The vibration treatment is performed at a constant rate of vibration action. A speed setter 12 is used for this purpose. The value of the voltage variation across the pickup 7 is subtracted in the automatic speed stabilizer 6 from the value of the voltage across the setter 12, thereby ensuring a negative feedback regarding the speed of the motor 2. FIG. 4 is a diagrammatic representation of the nature of the vibration action process. The motor 2 is sped up at a constant acceleration so that the angular velocity Ω of the electric motor $2 increases to its maximum value ΩIIIX. As soon as the excitation frequency matches one of the resonant frequencies of the workpiece 14, the electromotive force of the bearing 10 reaches its maximum value E.
Reach max. The initial vibrational excitation is performed at either the lowest natural frequency or the highest natural frequency of the workpiece 14 within a preselected frequency range. During vibrational excitation, microplastic deformations tend to occur within the material of the workpiece 14, so that internal residual stresses within the material are reduced and stabilized during further processing. Such a change in the residual stress within the workpiece 14 resulting from the vibrational excitation leads to a change in the resonant frequency of the two workpieces 14.

FIG. 5 shows the process of vibration excitation at one of the resonant frequencies of the workpiece 14. When the vibration m is carried out at the resonant frequency Ω, (indicated by a solid line in the diagram), The electromotive force of the bearing 10 reaches its maximum value Esaκ. As a result of such vibrational excitation at that frequency,
Microplastic deformations occur within the material of the workpiece 14, reducing internal residual stresses, lowering the electromotive force value of the bearing 10, and shifting the resonant frequency of the workpiece 14 towards a lower frequency region. The value of ΔΩ is determined by the resonant frequency drift (dr
ift). The electromotive force of the bearing 10 now attains its maximum value at the frequency of the vibration excitation (indicated by a dotted line in the diagram) which has been shifted as a result of the vibration treatment. In case of a mismatch between the excitation frequency and one of the resonant frequencies of the workpiece 14, the bearing 10
The electromotive force of has a lower value, i.e. E-''Ein.

The vibration treatment process is carried out in automatic continuous mode. The initial vibrational loading of the workpiece 14 to the set harmonic causes the device 6 to
As a result of this action, automatic tuning to resonance takes place until the electromotive force value of the bearing 10 stabilizes. Then,
Arithmetic unit N13 sends a command to change to an adjacent harmonic characterized by another co-S frequency. Tuning to resonance then takes place in this new phase until the emf value of the bearing lO stabilizes. bearing 10
When the electromotive force value of remains constant after switching to the adjacent harmonic, the vibration processing is stopped. A simple variation of the method proposed here is that the setter 12 and the arithmetic unit M
It can be implemented without using 13. In such a case, the vibration treatment of the workpiece 14 is interrupted and the vibration exciter 1 is retuned to a different mode with the aid of the mounting W6. Next, the electromotive force value of the bearing 10 is read by the meter 4, and the vibration excitation is continued at the given frequency until the electromotive force value is stabilized.

i.e. bearing 1 as read by instrument 4
When the minimum value of the zero emf does not change, the vibrational excitation is interrupted, resulting in a retuning at a shifted frequency as a result of a partial reduction of the internal stress in the workpiece 14, and the vibrational action is reduced. repeat. Stop the vibration excitation for a given harmonic whenever the emf value does not change after the next retuning of the vibration exciter 1 to resonance and the emf value remains at its maximum value. Force. This is actually the point of final stabilization of the internal stresses in the workpiece 14 for a given harmonic. As a result, the workpiece 14
Not only does the microplastic deformation within the material of the workpiece 14 cease, but the
The intense absorption of vibrational energy by Vibratory excitation of the workpiece 14 at another resonant frequency is then immediately carried out, followed by a similar vibratory excitation procedure at the other resonant frequency of the workpiece 14. The vibration treatment process is stopped whenever vibration excitation at other co-rR frequencies of the workpiece 14 does not result in any decrease in the emf value. It is marked for instrument 4. (f) Effects of the Invention The present invention not only reduces residual stress in cast and welded workpieces, but also achieves the best results when applied to prevent warping of workpieces after die forging or bending. You can find it useful.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus according to the present invention. FIG. 2 is another embodiment of the automatic motor speed stabilization device according to the present invention. Figure 3 presents the electromechanical characteristics of the vibration exciter according to the invention. FIG. 4 shows the frequency-amplitude characteristics of electromotive force fluctuations in accordance with the present invention, taking into full consideration resonance with various harmonics. FIG. 5 shows the amplitude and frequency of the electromotive force and the sikcing caused by excitation. (G) Explanation of symbols in the drawings 1. Electromechanical unbalanced vibration exciter, 2. Electric motor, 3. Converter, 4. Instrument, 5. Amplifier, 6. Automatic motor speed stabilization device, 7. Motor angular velocity pickup, 8. Motor frame, 9. Bearing race, 10. Bearing, 11. Motor armature, 12. Setter for input voltage fluctuation strength, 13. Arithmetic unit, 14. Workpiece, 15. Commutator, 16. Clamp, A - motor frame terminal, B - bearing race terminal, C, D - armature winding terminal, T = b - F Ω (where b - motor constant, bundle, Ω - motor Angular velocity〉 F agent

Claims (5)

[Claims] (1) A workpiece being processed at various harmonic workpiece resonance frequencies by an electromechanical unbalanced vibration exciter connected to an electric motor until the resonance frequency is stabilized. In a method for vibration treatment of a workpiece that includes complex repeated vibration excitation, the value of an electromotive force of a motor armature bearing is continuously measured during the vibration treatment, and the value of the electromotive force stops changing. Sometimes, the vibration exciter is tuned to resonance at the natural frequency of the workpiece, which is shifted as a result of the vibration treatment, and is repeated in a complex manner until a frequency is reached at which the emf remains constant. A vibration processing method characterized in that vibration excitation is performed for each harmonic. 2. The method of claim 1, wherein the vibration treatment is stopped during tuning of the vibration exciter. 3. A method according to claim 1, characterized in that the vibration treatment is carried out continuously during the entire vibration process. (4) The process according to claim 1 or 2, comprising an electromechanical unbalanced vibration exciter (1), a voltage converter (3), and a meter (4) connected to a variable speed electric motor (2). In an apparatus for carrying out a method for treating vibrations of an object, an amplifier (5)
, an automatic speed stabilizer (6) of the motor (2) and an angular velocity pick-up (7) of the motor (2) are provided, one race (9) of the bearing (10) of the motor armature (11) is electrically isolated from the frame (8) of the motor (2), and the input of the automatic speed stabilizer (6) of the motor (2) is connected to the angular velocity pickup (7) of the motor (2) and the commutator. (16) then electric motor (2)
and the output of said device (6) is connected to the input of the converter (3) and the meter (4) is connected to the output of the amplifier (5). has been
The input of the amplifier (5) is connected to the frame of the motor (2) and the bearing (10) of the armature (11) of the motor (2).
A device characterized in that it is connected to the race (9) of ). (5) A setter (12) for the strength of input voltage fluctuation of the automatic speed stabilizer (6) of the electric motor (2) and an arithmetic unit (
13), and the input of the automatic speed stabilizer (6) of the electric motor (2) is connected via a setter (12) to an arithmetic device (13), and an arithmetic device (13) is provided.
13) is subsequently connected to an instrument (4) and an amplifier (
Claim 4, characterized in that:
The device described in.