磁极钢是制造小型发电机(汽车用或拖拉机用发电机)不可缺少的零件之一(如图1),生产这种钢材对支援农业具有重大意义。以往是采用手工锻打的方法,因此产量低,消耗大。现以轧制方法来代替手工锻打,可以大大提高产量,降低成本,节省金属材料,为小型发电机大批生产创造了有利条件。磁极钢是一种小型异型钢材,它有占总面积较大比例的“头部”和占总面积较小比例的“两翅”,翅的几何形状各有不同,有薄而长的,有厚而短的,随着使用上的需要而不同,见图2,3,因此变形很不均匀,在孔型 Magnet steel is one of the indispensable parts for the manufacture of small generators (generators for automobiles or tractors) (Figure 1). The production of such steels is of great importance to supporting agriculture. In the past is the method of manual forging, so low yield, costly. Now rolling instead of hand forging, which can greatly increase production, reduce costs and save metal materials, small generators for mass production has created favorable conditions. Magnetic steel is a small special-shaped steel, which has a larger proportion of the total area of ​​the “head” and accounts for a small proportion of the total area of ​​“two wings”, the wing geometry vary, thin and long, there are Thick and short, with the use of different needs, see Figure 2, 3, so the deformation is very uneven, in the hole