... is 42CrMo , heat treatment is HB220-280 it composed of down of roll, down roll bearing pedestal, down roll input ... bearing, tuning cylinder6) Balance device Composed of balance compact, screw3-3. Hydraulic system Composed of Y series motor, gear pump , valves , oil ... on the control box.3-5. Digital display systemThis machine adopts two sets of digital instrument and displacement sensor formed a ...