设计并研制了深内孔等离子弧粉末喷焊枪，该枪具有在高温下连续稳定工作的优异性能。
A plasma gun for spraying welding inside surface of deep hole with powder is designed and developed which has the property worked continuously at high temperature.
笔者主要阐述了数控深孔钻床在使用枪钻进行深孔加工时工艺参数的选择，寻求最佳加工性能，以求达到快速加工、提高效率的目的。
Hollow shaft type high pressure cooling system is used to solve the problem in deep drilling, as well as gun-drill with open groove, proper cutting consumption and single tool withdraw are applied.
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