轧制高精度园钢,目前各国一般均采用园——园孔型系统。该系统中每个孔型的轧槽半径是相等的,但随着孔型大小变化而递减。最后的两个孔型轧槽是用同一半径构成的。下面研究的是由四个园孔型构成的孔型系统(见图1),按轧制顺序第一个孔型叫粗轧孔型、中间的二个叫精轧前孔型、最后的一个叫精轧孔型。孔型的构成要素有:轧槽半径ri,张开角β_i;切线段 High-precision rolling steel, the current countries are generally used Park - Park hole system. In this system, the groove radius of each groove is equal but decreases with the size of the hole. The last two grooved grooves are made of the same radius. The following is a hole system consisting of four garden-hole type (see Figure 1), according to the order of rolling the first hole called the roughing pass type, the middle two are known as finishing before pass, the last one Called finish pass type. Hole-type components are: groove radius ri, opening angle β_i; Tangent section