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辊切切分轧件时，产生的水平分力必须使轧件弯曲，保证切分轧件与轧件弯曲同步进行．就预切分这次后连体轧件的断面形状，也就是对预切分道次的最佳孔型设计进行探讨．目的在于满足生产需要，保证在生产过程中能够顺利完成将轧件切分开，另外从节能省力的角度，也要选择合理的孔型断面形状。
Roll cutting slicing, the resulting horizontal component of the rolling must be bent to ensure that the slicing rolling and rolling bending simultaneously. Pre-cutting the cross-sectional shape of the piece after rolling, which is the best pre-cut passway design of the hole to be explored. The purpose is to meet the production needs to ensure that the smooth completion of the production process will be cut from the rolling, the other from the energy saving point of view, but also to choose a reasonable shape of the hole section.