我们为了轧制外型精度要求较高的深冲扁钢及带槽扁钢,选用了新的孔型系统,孔型结构也作了某些改进。经过实践证明,新孔型系统有不少优点,但也应该指出,只有在它适用的范围内应用才是有效的。一、轧制扁钢的孔型系统(一)轧制??常用的孔型系统轧制扁钢最常用的孔型系统有两类:第一类孔型系统是带立轧孔及自由展宽平轧孔(以下简称为平轧孔)组成的孔型系统。一般立轧孔的数量为2～3个,采用更多的立轧孔对圆角及侧边加工固然有良好的作用,但与此同时会带来频繁的翻钢操作及使翻钢时轧件的宽厚比增大,因此除造成操作上的困难外,还延长了 In order to mill deep-drawing flat steel and slotted flat steel with high requirement on appearance accuracy, a new hole type system was adopted and some improvements were also made to the hole type structure. Practice has proved that the new hole system has many advantages, but it should also be pointed out that it is valid only in the context of its application. First, the rolling flat hole system (A) Rolling common hole system Rolling flat steel most commonly used hole system has two types: The first type of hole system is with stand-up hole and free to broaden Flat-rolled holes (hereinafter referred to as flat-rolled holes) composed of the hole system. Generally speaking, the number of holes to be rolled is 2 ~ 3. Although more vertical holes are used for fillet and side processing, there is a good effect. However, at the same time, frequent turning over operations and rolling The aspect ratio of the pieces increases, so it is lengthened in addition to the operational difficulties