Intelligent method and equipment for removing stress by harmonic oscillation

Abstract

An intelligent "harmonic method" for eliminating the stress of workpiece features that based on harmonic superposition principle, a combination of optical frequencies is chosen to vibrate the workpiece and propagate different high-frequency harmonic waves in the workpiece in different directions, resulting in stress removal. Its equipment is composed of microcomputerized information processing system, high-precision speed regulation system, vibration acceleration measuring system and frequency spectrum analyzer consisting of periodic sampling and automatic tracking circuit, higher flow-up low-pass filter and high-speed microprocessor in said information processing system. Under the control of software, the stress in workpiece can be effectively eliminated and the relative data and technological curves can be displayed.

Description

technical field [0001] The invention relates to an application of electronic technology in vibration aging technology. Background technique [0002] In the existing vibration aging equipment, a traditional vibration treatment method (traditional method for short) is generally adopted. This method is based on the attached figure 1 In the frequency sweep curve shown, the vibration aging treatment is performed on the metal workpiece at the frequency with the largest vibration acceleration amplitude of the metal workpiece, that is, at the frequency fi=f5. At this time, the test of the vibration acceleration signal shows that the signal is a sine wave , its frequency f5=n5 / 60 (HZ) (n5-exciting motor speed (r / min)), we call the frequency fi=ni / 60 (HZ) as the fundamental wave, so the traditional vibration processing method is also called "fundamental wave Bofa". If the rotating speed range of the excitation motor is 1000-6000r / min, then the fundamental frequency fi=16.66-100HZ. ...

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Problems solved by technology

Since it is difficult to manufacture a shock-resistant high-speed motor, increasing the speed of the excitation motor is not a good way to obtain high-frequency vibration waves

[0004] as attached figure 1 , we can also find that when the traditional method is used for vibration aging treatment of metal components, it is at the frequency with the largest vibration acceleration amplitude of the workpiece, that is, at the frequency fi=f5, when the vibration treatment is performed on the component, what propagates in the workpiece is the fundamental of low frequency Wave, low frequency, long wavelength, low uniformity of the vibration wave on the workpiece, single mode shape, large amplitude of the workpiece, and large input power of the excitation motor

Only a small part of the power input by the motor is used to eliminate the residual stress of the workpiece, and most of it is consumed by the overall vibration of the workpiece, so more input energy is wasted

At this time, if the excitation force is not selected properly (too large), sometimes microscopic cracks will occur on the workpiece, and at the same time, the noise is also very large, forming noise pollution.

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