Fast digital control improving structure of normal lathe

The utility model relates to an expedited numerical-control transforming frame of engine lathes, comprising a numerical-control system, an AC servomotor and a horizontal engine lathe etc. The landscape orientation AC servomotor is fixed at the back end face of the saddle by a motor cabinet and is connected in a linkage way with a former cross lead screw by a synchronous pulley, a synchronous belt, a synchronous pulley and a connection shaft in turn. The portrait AC servomotor is fixed on the left end face of the feeding box by the motor cabinet and is connected in a linkage way with a former portrait screw mandrel by a shaft joint and the input shaft of the feeding box in turn. The utility model has the advantages as follows: 1. Cost is cut down; 2. Reconstruction cycle is shortened; 3. Product consistence is improved; 4. Assembly and disassembly are both easy.