基于预制孔的SiCf/SiC复合材料微小孔超声振动辅助钻削加工研究
Research on Micro-hole Drilling of SiCf/SiC CMCs Via Ultrasonic Vibration Based on Prefabricated Holes
肖培乾 1汪文虎 1吴晓锋 2蒋松山 2熊一峰1
作者信息
- 1. 西北工业大学机电学院,航空发动机高性能制造工业和信息化部重点实验室,航空发动机先进制造技术教育部工程研究中心,陕西西安 710072
- 2. 中国航发动力股份有限公司,陕西西安 710021
- 折叠
摘要
SiCf/SiC复合材料是典型的硬脆性难加工材料.为解决SiCf/SiC复合材料微小孔(＜1 mm)加工难题,提高加工精度和改善加工质量,先采用脉冲激光预制SiCf/SiC微小孔,再在不同预制孔尺寸和加工参数下开展直径0.5 mm的SiCf/SiC微小孔超声振动辅助钻削加工试验,最终确定了合适的激光预制孔尺寸及超声振动辅助钻削加工参数域.结果表明:脉冲激光预制孔时存在的较大热影响区和微裂纹等缺陷,会明显影响后续超声辅助钻削微小孔的入、出口质量,推荐的预制孔直径为 0.3 mm;超声振动辅助钻削加工时,选择主轴转速为 11 000～15 000 r/min、进给速度为 2～10 mm/min,可获得加工质量较好的SiCf/SiC微小孔.
Abstract
SiCf/SiC ceramic matrix composites are typical hard and brittle difficult-to-machine materials.To solve the problems of machining micro-holes(<1 mm)in SiCf/SiC ceramic matrix composites,improve the machining accuracy and quality,pulse laser is first used to prefabricate SiCf/SiC micro-holes,and then ultrasonic vibration assisted drilling experiments of Φ0.5 mm micro-holes in SiCf/SiC ceramic matrix composites are carried out under different prefabricated hole sizes and machining parameters to determine the appropriate laser prefabricated hole size and ultrasonic vibration assisted drilling parameter domain.The results show that the defects such as large heat-affected zone and micro-cracks in pulse laser processing of prefabricated holes can significantly affect the quality of the inlet and outlet of micro-holes drilled by the subsequent ultrasonic-assisted drilling,the prefabricated hole size is recommended to be Φ0.3 mm.When using ultrasonic vibration assisted drilling,selecting a spindle speed of 11 000～15 000 r/min and a feed rate of 2～10 mm/min can obtain SiCf/SiC ceramic matrix composites micro-holes with good machining quality.
关键词
陶瓷基复合材料/激光/预制孔/超声辅助钻削/微小孔Key words
CMCs/laser/prefabricated holes/ultrasonic vibration-assisted drilling/micro-hole引用本文复制引用
出版年
2024
NETL
NSTL
万方数据