The rolling pass is one of the important technological parameters of the ring rolling process.
在环件轧制过程中，孔型是环件轧制的重要工艺参数之一。
The double radius ellipse pass is better than the one of single radius ellipse in the big round bar or big section steel rolling.
在大圆钢轧制或大断面轧件延伸孔型系统中，双半径椭圆孔型与单半径椭圆孔型相比，具有轧件易咬入、变形较均匀、孔型磨损小等优点。
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