Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 1, Pages 791-799Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.10.010
Keywords
Rotary ultrasonic machining; Ceramic matrix composites; Tearing defects; Drilling
Categories
Funding
- Beijing Natural Science Foundation [3141001]
- National Natural Science Foundation of China [51475260, U1430116]
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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.
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