工件顶尖孔与顶尖之间的长时间高速回转磨擦,产 生大量的热,由于散热条件较差,致使温度愈来愈高,因而时常烧伤顶尖。为了解决顶尖烧伤问题,工厂采用了活顶尖和空心液冷式顶尖(见《机械工人》(冷)1957年10期)。但这两种还有缺点:活顶尖:1)刚性差,不适合于重、大型零件加工;2)制 Long time high speed rotary friction between the top hole of the workpiece and the top, resulting in a lot of heat, due to poor cooling conditions, resulting in higher and higher temperatures, which often burn the top. In order to solve the top burn problem, the factory adopted the top of the top and hollow liquid-cooled top (see “mechanic” (cold) 1957 10). But there are two disadvantages of these: live top: 1) poor rigidity, not suitable for heavy, large parts processing; 2) system