... ,and treated to relive stress by tempering.Hydraulic drive.Return of knife beam is smooth and prompt by accumulator or ... of the machine.nc shearing machine,hydraulic swing beam shear,machine tool1)Series QC12Y hydraulic swing beam shear adopts steel-welded structure,vibration ... ,high rigidity ,sturdy and durable .2)Hydraulic drive ,swing beam ,return of knife beam is smooth and prompt by accumulator or ...