The use of sapphire is restricted by its cost and because the material is difficulttomachine and form.
限制使用蓝宝石的因素主要是其价格以及这种材料难于加工和成形。
2
However, it is difficulttomachine this material in conventional machining methods because of its high hardness and brittleness as well as inconductvity, thus restricting its application area.
但由于硬度高、 脆性大、大多数陶瓷材料不导电，传统的机械加工方法难以加工，使用范围受到限制。
3
Therefore, it is a new way for difficult-to-cut material to deep-hole finish machine by applying ultrasonic vibration machining technology to deep-hole lapping.