前言圆钢是轧钢车间最普通的型钢产品之一。上海各轧钢车间对它是非常熟识的,因之在其轧制方法上亦已积累了不少的经验。不过欲保持一种产品的正常轧制,影响的条件是非常多的,并且在内容上亦是很复杂的,其中如孔型设计就直接地影响着产品的质量与产量。要求完善的孔型设计,其困难并不在于计算上,而是在于如何根据自己工厂的设备原料和产品的一些具体情况,在生产发展、客观条件不断演进的场 Preface Round bar is one of the most common section steel products in the rolling mill. Shanghai’s rolling mill is very familiar with it, because of its rolling method has also accumulated a lot of experience. However, in order to maintain the normal rolling of a product, the influence conditions are very large and the content is also very complicated. For example, the hole design directly affects the quality and output of the product. Requirements of the perfect hole design, the difficulty is not calculated, but rather how the factory according to their own plant raw materials and products in some specific circumstances, the development of production, the objective conditions of the evolving field