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Fine Metal Wire Stress Relief And Forming Technology Based On Ultrasonic Vibration

Posted on:2015-09-18Degree:MasterType:Thesis
Country:ChinaCandidate:C L YangFull Text:PDF
GTID:2181330467985616Subject:Precision instruments and machinery
Abstract/Summary:PDF Full Text Request
The precision of accelerometers have strong influences on the precision of inertia navigation system. Flex lead is the connection between movable and stationary parts and used for signal transmitting. However, in assembly process, residual stress is introduced into flex lead which will cause drift error and deteriorate the precision of the accelerometer. Stress relief of the flex lead is a hot topic under research.Ultrasonic vibration stress relief (UVSR) method is put forward after reading large amount of papers, under the premise of full consideration of different stress relief methods and the characteristic of flex lead as micro flexible component. This paper deals with the advantages and practical significance of UVSR, discussed the mechanisms of UVSR from both macro and micro scale. This paper also present the feasibility analysis using UVSR mechanisms. SEM experiments find the materials composition and axial tension test determines the properties. With the help of static structural analysis module and harmonic analysis module in ANSYS Workbench, the residual stress under pre-displacement and the exciting force can both be obtained. Integrate the experiment data with UVSR macroscale mechanisms, the feasibility of UVSR on fine wire is confirmed.The paper also introduces the ultrasonic stress relief on fine wires experiments conducted by experimental devices built by ourselves. The specimens are flex lead and fine copper wires with a diameter5times and similar material properties. The stress relief experiments are conducted by ultrasonic vibration module, the wire terminal position before and after experiment is collected by image acquisition and processing module, the change of residual stress is analyzed by ANSYS simulation.In conclusion, a series experiments confirmed that UVSR is applicable for stress relief on micro flexible component. The experiments also explore the effects of different parameters such as vibration time, amplitudes and exciting positions.
Keywords/Search Tags:ultrasonic vibration stress relief, flex lead, residual stress relief
PDF Full Text Request
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