在车床上切断零件,想用高速切削是很困难的事情。因为在高速切削时,切断刀的工作条件比一般车刀吃力得多;切断刀的强度差,干活时会发生强烈的振动,切屑会‘挤住’在刀具和工件中间,刀会被‘推偏’,很容易损坏。此外,硬质合金刀片时常会从刀桿上脱落下来,这也是因为切断刀的工作条件太吃力,以及刀片与刀片槽的接触面积太小而使銲接的强度不够的缘故。附图所示是一种硬质合金切断刀,这种切断刀可以在较高的切削用量下切断钢件和铸铁件。这种切断刀有许多特点,所以强度很 It is very difficult to cut parts in a lathe and use high-speed cutting. Because high-speed cutting, cutting knife working conditions than the average lathe more difficult; cutting knife strength is poor, work will occur when the strong vibration, the chip will ’squeeze’ in the middle of the tool and the workpiece, the knife will be ’ Off bias’, it is easy to damage. In addition, cemented carbide inserts often fall off the arbor, which is also due to the working conditions of the cutter are too hard, and the contact area between the blade and the insert groove is too small, so that the welding strength is not enough. The figure shows a carbide cutting blade that can cut steel and cast iron at a higher cutting load. This cutting knife has many characteristics, so the strength is very