在车削大型工件时,顶尖接触工件的中心孔发热时要经常加油,有时甚至要停车,这样工人劳动强度大而且又耽误工时,经我们改进,设计成一种能注油的顶尖,如图所示。 When turning large workpieces, the center hole of the top contact work piece should be refreshed frequently when it is hot and sometimes even stopped. This results in labor-intensive and time-consuming work. As a result of our improvement, it is designed as an oil-filled tip as shown.