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选择壁厚公称值是轧制表计算的基础,而且,在很大程度上还决定着轧制的效率。壁厚越小(与ΓОСТ规格规定的公称值相比),成品的计算产量越大,金属的消耗系数也就越小。可是,超出ΓОСТ规定的壁厚最小值的或然率增大了,于是使金属的消耗系数增大。可见,客观上存在一个合理的轧制公称值。周期轧管的特点是:壁厚相对于平均值的波动随轧制公称值减小而增大(增大了的相对壁厚不均)。根据对成品管壁厚波动进行统计处理求出下列表示壁厚最大相对不均Pmax和
Nominal wall thickness is calculated on the basis of the rolling table, and, to a large extent, determines the efficiency of the rolling. The smaller the wall thickness (compared to the nominal value specified by the ΓОСТ specification), the larger the calculated yield of the finished product, the smaller the coefficient of metal consumption. However, the probability of exceeding the minimum wall thickness specified by ΓОСТ increases, thus increasing the coefficient of metal consumption. Visible, objectively there is a reasonable rolling nominal value. The characteristic of periodic tube rolling is that the fluctuation of the wall thickness relative to the average value increases as the rolling nominal value decreases (the relative wall thickness increases with an increase). According to the finished product pipe wall thickness of the statistical processing to obtain the following shows the maximum relative wall thickness Pmax and uneven