The use of sapphire is restricted by its cost and because the material is difficult to machine 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。
However, it is difficult to machine 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。
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.
因此，将超声振动加工技术应用于深孔研磨加工中，为难加工材料的深孔精加工开辟了一条新的途径。
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