Drilling induced tearing defects in rotary ultrasonic machining of C/SiC composites

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• 作者：Pingfa Feng^a ; ^c ; Jianjian Wang^a ; ^b ; Jianfu Zhang^a ; ^b ; ^{zhjf@mail.tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jingzhen Zheng^d
• 关键词：Rotary ultrasonic machining ; Ceramic matrix composites ; Tearing defects ; Drilling
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：791-799
• 全文大小：3240 K

文摘

Drilling induced tearing defects at the hole exit restrict the reliability of C/SiC production. In this study, the drilling induced tearing defects in rotary ultrasonic machining of C/SiC composites were investigated quantitatively. The mechanism of tearing defect formation was studied through the detailed observation of thrust force. Experimental results indicate a positive dependence of tearing defect on the thrust force. A larger thrust force corresponds to a larger drill displacement during the formation process of tearing defect, resulting in larger tearing defect. RUM can averagely reduce the tearing defect at the hole exit more than 60%. Tearing defects can be further reduced by increasing the spindle speed and the ultrasonic amplitude, or decreasing the feed rate.