Sizing mill

The utility model relates to a can reduce the roll frame and change the sizing mill that thereby manufacturing cost was practiced thrift to quantity, including a transmission, the secondary drive device, first frame, first roll frame, second frame and second roll frame, first roll frame and second roll frame are arranged along the direction of rolling of steel pipe in proper order, and first roll frame is fixed to be set up on first frame, second roll frame is fixed to be set up on the second frame, first roll frame can be rolling the external diameter of big hollow forging be greater than second roll frame can be rolling the external diameter of big hollow forging, be equipped with the entry memorial archway on the lateral surface of first frame, be equipped with the export memorial archway on the lateral surface of second frame, a transmission's the output shaft and the input shaft of first roll frame, the figure of secondary drive device equals the figure of second roll frame, and the input shaft of the output shaft of secondary drive device and second roll frame.