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自动定心钻夹头是一种万能夹紧装置,它可以迅速而可靠地夹紧刀具。万能性由钻夹头的活动夹紧元件保证。它借助于专门机构沿轴线同步位移同样的距离。三爪钻夹头得到了广泛的应用,它依赖两种方法施加夹紧力:搬手夹紧和自动夹紧。前一种有一系列缺点:须使用专门扳手;丝扣和楔铁容易磨损,钻头定心的精度低;工作时钻头有自动脱离的趋势;因齿圈未锁紧而引起工伤的危险。鉴于上述缺点,被广泛用的自动钻
The self-centering drill chuck is a universal clamping device that clamps the tool quickly and reliably. The versatility is ensured by the movable clamping element of the drill chuck. It uses the specialized agencies to synchronously displace the same distance along the axis. Three-jaw drill chuck has been widely used, it relies on two methods to apply clamping force: hand-moving clamping and automatic clamping. The former has a series of disadvantages: a special wrench must be used; the threading and wedge iron are easy to wear, the precision of the bit centering is low; the drill bit is automatically detached during work; the danger of work injury caused by the unlocking of the ring gear. In view of the above shortcomings, automatic drilling is widely used