... steel plates,and treated to relive stress by tempering.Hydraulic drive.Return of knife beam is smooth and prompt by accumulator or ... and the shearing times are on the front of the machine.nc shearing machine,hydraulic swing beam shear,machine tool1)Series QC12Y ... eliminate stress ,high rigidity ,sturdy and durable .2)Hydraulic drive ,swing beam ,return of knife beam is smooth and prompt by accumulator ...