The Study of Synchronous Vibration Stress Relief Platform with Adjustable Multi-Frequency

• Main Authors: Chin-Yuan Chang, 張晉源
• Other Authors: Jenq-Shyong Chen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/34r6uw

碩士 === 國立中興大學 === 機械工程學系所 === 106 === The purpose of this study was to develop a residual stress relief device for workpieces produced during metal 3D printing. The concept of the device is to use vibration to eliminate welding residual stress technology applied to metal 3D printing, using the speaker as a vibration source, improving the available frequency range of the vibration platform, and designing the speaker in a flat structure to make the vibration The platform can be easily installed in a metal 3D printing machine, and it can also achieve the effect of synchronous vibration to eliminate residual stress during continuous printing. Then construct the analysis model of the vibration device, simulate the vibration with the vibration principle and the structural analysis software, and simulate the amplitude of the device under load. When the work piece is continuously printed, the metal will show different states of molten state, semi-melted state and solidified state due to the length of time printed on the workbench. Therefore, this paper proposes to use three kinds of composite wave signals to verify whether it is continuous. Printed metal parts have better residual stress relief. The human-machine interface that can generate composite wave signals is written in LabVIEW program to achieve frequency control, which greatly reduces the cost of the stress relief device. Firstly, the performance test and temperature resistance test of the device are carried out to understand the amplitude of the device at different frequencies and the heat insulation effect of the device. Then, the experiment is performed using a welding platform, and the simulation is performed on the metal 3D printer, and the device is used for printing. Synchronous vibration, set the single frequency signal to 100Hz, multi-frequency signal is 100Hz, 130Hz, 230Hz synthesis frequency, and finally measure the residual stress of the workpiece without vibration, single frequency vibration and multi-frequency vibration by X-ray diffractometer. This study wants to achieve good residual stress relief effect by this device, reduce the manufacturing cost of metal 3D printing, obtain better processing quality, and benefit the development of laminated manufacturing in the future, so that metal 3D printing can be more popular in the industry.