一引言在任何一种机械制造业的工作程序中,金属切削过程本来是占着一个重要的位置。可是因为现代工业的日益发达,而其生产方式亦日趋向于大量生产的途径,因此有许多新的生产方法都在突飞猛晋中;如压力模铸法的改进,失臘浇铸法的被广泛应用等,在将来也许会把金属切削业这一门,推到另一个世界里去。不过在我国目前情形,它还是可以 I. INTRODUCTION The metal cutting process has always occupied an important position in any kind of mechanical manufacturing process. However, because modern industry is increasingly developed and its production methods are also tending towards mass production, many new production methods are rapidly advancing; for example, the improvement of the pressure die casting method, the loss of the lost casting method. Widespread applications, etc., may push the metal cutting industry into another world in the future. However, in our country’s current situation, it can still