The whole structure: 1. Steel plate welded structure, hydraulic transmission, accumulator return, holistic processed, vibrating toeliminate stress, high strength and good rigidity. 2. Mechanical torque system makes sure the synchronization of cylinders. 3. The stroke of slider and back gauge is adjusted automatically by double servo motors or transducer, and showed on CNC Mechanical torque or NC control panel. 4. Slanting wedges can be chosen to install on the top dies which can be adjusted by hands or automatically. Hydraulic compensation system is installed under the worktable.