在车床上加工内螺纹时,为保证同轴度要求,一般采用顶尖顶住丝锥的中心孔攻丝,或者使用固定式丝锥夹头,上述两种方法都不够方便。因此,我们制造了自动定心机用丝锥夹头,它利用双头左右螺纹推动两个V形卡爪同时夹紧或松开,达到自动定心的目的。更换丝锥也十分方便(附图)。 In the processing of internal thread lathe, in order to ensure the coaxial requirements, the general use of the top center tap tap to tap, or use a fixed tap chuck, the above two methods are not convenient enough. Therefore, we have made a self-centering machine tap chuck, which uses two left and right threads to push two V-shaped claws simultaneously clamping or release, to achieve the purpose of automatic centering. Tap replacement is also very convenient (with photos).