The provincial key science and technology that assumes by the group that breath out a quantity tackles key problem project " machine tool of large and high-grade numerical control is mixed with large knife library trade knife unit automatically " , passed the expert appraisal that organizes by hall of province science and technology. This project was adopted give priority to with own innovation, introduce digest draw the kind of research and development that innovates again, captured a series of technology difficulty such as manufacturing technology. The project used the means of drive of servo electric machinery, time that change a knife accuracy of short, motion tall, manipulator retroflexions use the accurate gear rack and hydraulic pressure tilting mechanical hardware, claw that grab a knife locking wedge range is reliable, use successfully at machine tool of large and high-grade numerical control to be mixed with large knife library in trading knife unit automatically, have its innovation sex. The development of this project and development are successful, broke our country to cannot produce the passive situation of large knife library and automatic device, still belong to initiate in home, its function achieved international advanced level. Current, the large knife library of development and change knife device automatically to apply successfully already in Qiqihaerdi in the factory of bed of domestic large scale computer such as factory of 2 machine tools, got the accord of the user is approbated, product market prospect is capacious. As the change of demand of domestic and international market, the group that breath out a quantity will be in this to develop large knife successfully library and change base of knife unit product automatically, the series product with further development complete form a complete set, in order to satisfy the requirement of domestic and international different user.