Two-stage distributed combined dynamic vibration absorber vibration reduction method aiming at thin-wall part multi-mode time-varying cutting vibration control

A technology of dynamic vibration absorbers and thin-walled parts, applied in the field of damping and vibration reduction, can solve problems such as mechanical or structural material fatigue, troubles or even hazards, bridge collapse, etc., and achieve good robustness, good vibration reduction effect, and wide frequency band Effect

Inactive Publication Date: 2017-01-04
BEIJING UNIV OF TECH +1
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Problems solved by technology

Although vibration has a positive side, such as the invention and application of vibrating screens, vibrating piles, and seismographs, it will cause negative effects in more cases, causing unnecessary troubles and even hazards, such as fatigue of machinery or structural materials caused by resonance , damage to buildings and collapse of bridges caused by vibration

Method used

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  • Two-stage distributed combined dynamic vibration absorber vibration reduction method aiming at thin-wall part multi-mode time-varying cutting vibration control
  • Two-stage distributed combined dynamic vibration absorber vibration reduction method aiming at thin-wall part multi-mode time-varying cutting vibration control
  • Two-stage distributed combined dynamic vibration absorber vibration reduction method aiming at thin-wall part multi-mode time-varying cutting vibration control

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Embodiment 1

[0027] Such as figure 1 As shown, the small end diameter is 50mm, the large end diameter is 300mm, the length is 850mm, and the semi-conical part with a wall thickness of 16mm is a typical thin-walled structural part. exist figure 2 In the middle, both sides of the bottom surface are fixed and the outer surface is milled. The initial thickness of the part is 16mm, and the thickness of the final processed part is 12mm. When the thickness changes from 16mm to 12mm, its natural frequency and other modal parameters will change, resulting in the migration of machining vibration frequency, which has obvious time-varying vibration characteristics. As the thickness of the part decreases, if the number and parameters of the vibration absorber remain unchanged, the vibration reduction effect of the vibration absorber will become weaker and weaker, which deviates from the optimal vibration reduction effect. Therefore, using this new type of two-stage distributed combined dynamic vibra...

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Abstract

The invention provides a two-stage distributed combined dynamic vibration absorber vibration reduction method aiming at thin-wall part multi-mode time-varying cutting vibration control and belongs to the technical field of damping vibration reduction. According to a first stage, multiple sets of or multiple dynamic vibration absorbers are arranged on mode formation sensitive points on a thin-wall structure part to achieve control over part multi-mode cutting vibration probably excited by cutting force on the whole cutting path in the cutting machining process. According to a second stage, multiple sets of dynamic vibration absorbers arranged on each mode formation sensitive point are tightly attached, the inherent frequencies of all dynamic vibration absorbers in the multiple sets (multiple) dynamic vibration absorbers are unequal, and therefore optimal control over time-varying cutting vibration caused by part inherent frequency migration caused by removal of a workpiece material in the cutting process is achieved. Compared with single-stage vibration absorbers, the two-stage distributed combined dynamic vibration absorbers have the advantages of being good in vibration reduction effect, large in bandwidth, good in robustness and the like, and can be installed and adjusted at a time to achieve effective control over vibration generated in the whole cutting process.

Description

technical field [0001] The invention relates to a two-stage distributed combined dynamic vibration absorber vibration reduction method for multi-mode time-varying cutting vibration control of thin-walled parts, belonging to the technical field of damping and vibration reduction. Background technique [0002] Vibration widely exists in nature and people's daily production and life. Earthquakes, strong winds, etc. will bring vibrations to buildings. Machine tools and rotating shafts in industrial production, massagers and washing machines in daily life all have vibrations. In a general sense, if the physical quantity that characterizes a movement changes repeatedly from time to time, it can be called vibration. Although vibration has a positive side, such as the invention and application of vibrating screens, vibrating piles, and seismographs, it will cause negative effects in more cases, causing unnecessary troubles and even hazards, such as fatigue of machinery or structura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q11/00
CPCB23Q11/00B23Q11/0032
Inventor 王民刘宇男昝涛高相胜张彦琳
Owner BEIJING UNIV OF TECH
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