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《Journal of Zhejiang University(Engineering Science)》 2017-01
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Nondestructive measurement for wall thickness of product molded by fluid-assisted co-injection molding using ultrasound

YANG Wei-min;ZHAO Peng;KUANG Tang-qing;FU Jian-zhong;CHEN Zi-chen;Key Laboratory of3D Printing Process and Equipment of Zhejiang Province,Zhejiang University;School of Electromechanical and Information Engineering,Yiwu Industrial and Commercial College;School of Mechanical and Electrical Engineering,East China Jiaotong University;  
A measuring method based on ultrasonic pulse reflections was proposed for measuring each different material layer's wall thick of multi-layer polymer co-injection molded product.The relationship between pressure amplitude of reflected wave against the interface between the different plastic layers and their acoustic impedances was established according to the law of reflection and transmission in interface.Acoustic impedance of each plastic layer can be calculated via the measurement of sound pressure amplitude of echo reflected from interfaces between two adjacent plastic layers.Then ultrasound velocity in each plastic is equal to acoustic impedance dividing their density.Wall thickness of each layer is equal to the product of ultrasound velocity and the propagation time of ultrasound in each layer,which can be measured from the reflected wave.Results showed that the ultrasonic measuring method had good accuracy compared with the method using scanning electron microscope.Errors of each layer were less than 4.5%,and error of total thickness was approximately equal to 1.6%.
【Fund】: 国家自然科学基金资助项目(51475420);; 浙江省自然科学基金资助项目(LY14E050017);; 浙江省教育厅2015年度高校国内访问学者专业发展资助项目(145);; 中央高校基本科研业务费专项资金资助项目(2015QNA4001)
【CateGory Index】: TQ320.77
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【Co-citations】
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1 YANG Wei-min;ZHAO Peng;KUANG Tang-qing;FU Jian-zhong;CHEN Zi-chen;Key Laboratory of3D Printing Process and Equipment of Zhejiang Province,Zhejiang University;School of Electromechanical and Information Engineering,Yiwu Industrial and Commercial College;School of Mechanical and Electrical Engineering,East China Jiaotong University;;Nondestructive measurement for wall thickness of product molded by fluid-assisted co-injection molding using ultrasound[J];浙江大学学报(工学版);2017-01
2 ZHANG Kai;YU Zhong;HUANG Yi-bin;SHANGGUAN Yuan-shuo;LI Ting;DONG Tian-wen;School of Physics and Electronic Information,Shangrao Normal University,Jiangxi Province Key Laboratory of Polymer Preparation and Processing;;Analysis on the Influence of Melt Injection Order in Overflow Water-assisted Co-injection Molding Filling Process[J];上饶师范学院学报;2016-06
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