METHOD FOR MACHINING LARGE SIZE NON-RIGID WORKPIECES WITH STIFFENING RIBS LOCATED AT TWO SIDES Russian patent published in 1997 - IPC

FIELD: mechanical engineering, machining of large size workpieces, frame type, on program controlled machine tools. SUBSTANCE: machining is carried out in two steps: roughing and finishing. During the first step machining of inter-rib spaces at one side of frame is carried out by skipping every other space. Roughing of inter-rib spaces on other side of frame is carried out in turn without alternating the spaces over periphery of frame. Then roughing of remaining inter-rib spaces on first side of workpiece is carried out. Finishing of second side of workpiece is carried out in the same sequence as at roughing. Finishing of inter-rib spaces of first side of workpieces is carried out in succession over periphery of frame. EFFECT: improved quality of workpiece. 3 dwg