在钻床上加工同一工件时，有时需要调换直径不同的钻头套（或铰刀）等，这时，如用普通的钻夹头或钻头套来装夹刀具，很不方便，而且多次借助斜铁和锤头敲打来退卸刀具，这种方法容易损坏刀具和钻头套，直接影响到钻床的精度．为了避免这种缺点，使用我们设计制作的自动退... In the processing of the same workpiece on the drilling machine, sometimes need to change the diameter of the drill sleeve (or reamer), etc., then, such as the use of ordinary drill chuck or bit holder to clip the tool, very inconvenient, and many times with diagonal Iron and hammer beat to remove the tool, this method is easy to damage the tool and drill bit, directly affect the precision drilling. In order to avoid such shortcomings, the use of our design and production of automatic retreat ...