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Ball Bearing Quality Inspection and sorting control

Author: YuRunXiang
Tutor: AiChangSheng
School: Jinan University
Course: Mechanical and Electronic Engineering
Keywords: Ball Eddy Phase sensitive detection CPLD Configuration
CLC: TG115.28
Type: Master's thesis
Year: 2010
Downloads: 115
Quote: 0
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Abstract


Ball is an important part of ball bearings, steel balls of the ball bearing as the rolling elements of the bearing is under load and the dynamic performance is directly related to the parts, which directly affect the quality of the bearing life and reliability. With the high performance and the speed of the mechanical development of the surface quality of the bearing balls are more demanding. Ball bearing surface defects generally refers to the ball and sub-surface cracks, scratches, etc. These defects are restricting a key factor in improving the quality of the ball. At present, most manufacturers use artificial visual method ball check these defects, with the human eye fatigue, false detection rate, and sub-surface defects on the powerless; few balls testing equipment imported from overseas manufacturers, but the price is extremely high, generally only used for sampling, can not meet all the testing requirements. Thesis focuses on the characteristics of quality defects ball through formulas demonstrated using impedance analysis method for defect detection balls rationality, and various external factors on the degree of influence eddy current testing; ball surface eddy current crack detection method is correct and feasible The proposed method using eddy current testing surface and sub-surface cracks balls, scratches and other defects characteristic information. Papers in the analysis of eddy current testing system Ball objectives, functions, based on the bearing balls eddy current testing system for the analysis and design of functional modules. Choose the appropriate eddy current sensor, the design of the excitation signal source, amplifier, the sensor potential compensation circuit, orthogonal reference, the phase sensitive detector, filter, and isolation and other peripheral circuits of the PCB board finally produced. Using the HMI configuration software design quality of the ball detection and sorting system of the host computer display interface, and prepared a transport protocol and the next crew F020 high-speed microcontroller for data communication, after commissioning, the next crew collected data can be obtained quickly and accurately transfer to the host computer display, and the host computer to send commands can also be sent to the next bit machine the correct response. Through analysis of experimental data, the lift-off effect on the impact of the defect signal to determine the distance of the sensor to the ball of the right, according to the extracted feature information of defect analysis confirmed the eddy current signal acquisition board designed to correctly capture signal characterization ball crack and the relationship between the equivalent impedance plane.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT
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