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Analysis on Mechanism and On-line Monitoring System of Acoustic Emission Oriented to Precision and High Efficiency Grinding

Author: WuTianYu
Tutor: HanXueSong
School: Tianjin University
Course: Mechanical and Electronic Engineering
Keywords: Acoustic emission High precision grinding Online monitoring system Composite ceramics
CLC: TG580.1
Type: Master's thesis
Year: 2010
Downloads: 92
Quote: 0
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Abstract


As science and technology advances, as to meet the requirements of modern processing technology to obtain high precision grinding more and more people's attention. In order to obtain high-quality surface, people need to be on-line monitoring of the grinding process. Currently, most of the conventional monitoring methods depend on extraction forces, vibrations and other signals to the control of the machining process. This method can effectively characterize the processing situation, with some limitations. Based on acoustic emission technology online monitoring system that can identify physical characteristics of the processing is to control parts of the surface integrity, and effective method of surface damage, has become internationally recognized as the most promising means of grinding line monitoring. In this paper, acoustic emission technology as the core, to build a high-precision grinding process for on-line monitoring system, and use based on parameters and waveform-based analysis method to study under different grinding parameters of acoustic emission signals, the final analysis of the sound combined with experimental phenomena transmitted signal and the correlation between the grinding force and grinding process of material removal mode and energy changes on acoustic emission signals. On the basis of these findings, further grinding of ceramic composite in different directions is generated when the signal of acoustic emission. But also on the acoustic emission signal attenuation, propagation mechanisms and dislocation motion on acoustic emission signal strength of a preliminary inquiry. By studying our main conclusions are as follows: First, the acoustic emission signal RMS between grinding parameters associated with the mapping relationship that can reflect the process of grinding and removing changes in the way energy; Second, when grinding parameters change, the acoustic emission signal RMS and grinding force changes in the same direction, indicating that acoustic emission signals can characterize the physical characteristics of the processing; Third, the process of grinding the material brittle fracture and The degree of plastic deformation within the spectrum of acoustic emission signals in different frequency bands equivalent energy reflected; fourth warp along the grinding ceramic composite high surface quality can be obtained; fifth composite ceramics grinding monitoring cutting process, the acoustic emission sensors and acoustic emission sources should not exceed the distance between the 80mm. Practice has proved that, based on acoustic emission techniques for on-line monitoring system to ensure efficient processing of precision grinding of the workpiece surface quality has a positive meaning.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Grinding and grinding machine > General issues > Grinding principle and calculation
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