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介绍了在先成圆再变方这种生产方式下的方矩形管孔型设计方法。该方法利用方矩形管成品尺寸作为变形轧辊的内接尺寸，通过简单的计算公式获得各道次轧辊孔型的基本参数，再根据成品管的长宽比合理地配置孔型结构，可有效提高成品管的轧制质量。
This paper introduces the design method of rectangular tube hole under the production method of forming a circle in advance. The method uses the size of the rectangular tube finished product as the internal dimension of the deformed roll and obtains the basic parameters of the roll pass of each pass through a simple calculation formula and then the hole structure can be rationally arranged according to the aspect ratio of the finished tube Finished tube rolling quality.