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在车床上加工孔径比较大的管形件外圆,一般均使用大头活顶尖或用专门夹具支撑。但自己制做带有向心止推轴承的活顶尖比较麻烦。我院试验工厂经常加工内径φ57毫米的钝钛管,在加工外圆时制做了一种带有滑动轴承的简易活顶尖,其主体前端有60°尖,可作死顶尖用。最好将60°锥顶镶上硬质合金,这样可以延长顶尖寿命。这种顶尖具有两种用处,结构简单,转动灵活平稳,使用效果较好。结构如图:顶尖体须经淬火处理,HRC60～62。铜套压入活动锥体,铜套孔内有轴向油
Machined in the lathe larger diameter tubular body cylindrical, generally use the bulk of live tips or with special fixture support. However, making a live center with a thrust bearing to the heart is rather troublesome. Our factory often processing factory test φ57 mm diameter titanium tube, made in the processing of a cylindrical outer ring with a simple and easy to live with a sliding bearing, the main front 60 ° sharp tip can be used for the top dead. The best 60 ° cone top with carbide, which can extend the top life. This top has two uses, the structure is simple, flexible and stable rotation, the use of better. Structure shown in Figure: The top body to be hardened, HRC60 ~ 62. Copper sleeve pressed into the active cone, copper sleeve hole axial oil