轧制圆钢、圆坯等产品的成品孔型以及某些产品的中间孔型,常采用圆形断面孔型。由于对孔型要求不同,圆形断面孔型的结构和计算参数也有所不同。圆孔型结构如图1所示。设计圆孔时,通常使槽口宽度B大于高度H。而高度H与工艺要求的圆形轧件直径D相等。扩张角α=20～35°。 Round bar, round billet and other products finished hole and some products of the middle hole, often using circular cross-section hole. Due to different requirements of the hole type, the structure and calculation parameters of the circular cross section hole type are also different. Round hole structure shown in Figure 1. When designing a circular hole, it is common to make the notch width B larger than the height H. FIG. While the height H is equal to the diameter D of the circular workpiece required by the process. Expansion angle α = 20 ~ 35 °.