我们在加工大直径薄壁铜套(φ250～φ300mm)时,刚开始是在普通活动顶尖上套一个大直径锥体顶住薄壁铜套内径.再加工铜套外圆的。但在加工中发现铜套外圆的尺寸始终达不到规定的精度要求,不是出现锥度就是表面精糙度不一。后来我们分析得知,这是由于我们所买的普通活动顶尖是用普通角接触球轴承来支承的。它们的径向间隙较大,加工 When we are processing large diameter thin-walled copper sleeve (φ250 ~ φ300mm), we just start by setting a large diameter cone on top of ordinary activities to withstand the inner diameter of the thin-walled copper sleeve and machining the outer sleeve of the copper sleeve. However, the processing found that the outer diameter of the copper sleeve has always been less than the required accuracy requirements, is not a taper is the surface roughness varies. Later, we analyzed that this is because the top ordinary activities we bought were supported by ordinary angular contact ball bearings. Their large radial clearance, processing