英语翻译Cubic boron nitride（CBN）and polycrystalline cubic boron nitride（PCBN）inserts have traditionally been the tools of choice for hard-turning applications.But,they are considered too costly for many operations.The cryogenic machining

英语翻译Cubic boron nitride（CBN）and polycrystalline cubic boron nitride（PCBN）inserts have traditionally been the tools of choice for hard-turning applications.But,they are considered too costly for many operations.The cryogenic machining
英语翻译
Cubic boron nitride（CBN）and polycrystalline cubic boron nitride（PCBN）inserts have traditionally been the tools of choice for hard-turning applications.But,they are considered too costly for many operations.The cryogenic machining technique also allows greater use of low-cost ceramic inserts for hard-turning operations.
CBN and PCBN ceramic inserts tend to wear unevenly and prone to fracturing when hard turning dry or with water or oil-based coolants.Incresed fracture toughness resulting from low-temperature liquid nitrogen cooling provide more predictable ,gradual flank wear also allows alumina ceramics inserts to be used in the critical finishing operations.
The liquid nitrogen may be stored in a small ,dedicated cylinder near a machine,or in a supply tank that would serve multiple machines.Programming is similar to a traditional coolant delivery system.A flexible liquid nitrogen line attaches to a lathe’s turret via a rotational coupling.This line feeds a delivery nozzle clamped to the tool,which directs the liquid nitrogen to the insert tip.

英语翻译Cubic boron nitride（CBN）and polycrystalline cubic boron nitride（PCBN）inserts have traditionally been the tools of choice for hard-turning applications.But,they are considered too costly for many operations.The cryogenic machining
一直以来,立方氮化硼（CBN）和聚晶立方氮化硼（PCBN）镶嵌件在硬态车削中使用,但价格昂贵.低温冷却设备使低廉的陶瓷镶嵌件得以在硬态撤消中应用.
立方氮化硼、聚晶立方氮化硼和陶瓷镶嵌件容易产生磨损不均,且在无冷却剂或水基和油基冷却剂中切削易断裂.低温液氮提高了断裂韧性,缓慢的侧面磨损使得用陶瓷镶嵌件进行最终成型加工成为可能.
液氮可以储存在小型专用圆筒内,或者装在集中供应多台设备的容器内.使用起来与传统的冷却系统相似.柔性软管通过转动耦合把液氮输送到车床的刀架转塔.然后液氮被输送到夹在道具上的一个喷嘴,来冷却刀尖.