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把两个普通的钢锭模作为半个钢锭模组合成一个钢锭模,这样可以生产冒口切头量比较小的钢锭。作者用38Cr2Ni2MoA 钢浇注出五支重达9. 98t 的这种所谓双联钢锭。把一支钢锭破开后研究沿轴向缩孔分布的情况,发现缩孔长度几乎达到整个锭身的一半,但缩孔的最大横截面尺寸不超过钢锭平均直径的0. 15。又把其余四支锭的上半段按缩孔直径大小分成4个区域并以不同的锻造比锻造成阶梯轴锻件,研究缩孔锻合情况和锻造比对机械性能的影响。结果发现经不同锻比锻造后缩孔减小或锻合,但在冒口端同空气接触的缩孔采用任何锻比都
The two common ingot mold as a half ingot mold into a steel ingot mold, which can produce riser cut smaller amount of ingot. The author uses 38Cr2Ni2MoA steel pouring five weighing 98kg of this so-called double steel ingot. When a steel ingot was broken, the distribution of shrinkage cavities along the axial direction was investigated. It was found that the length of the shrinkage holes reached almost half of the whole body of the ingot, but the maximum cross-sectional dimension of the shrinkage cavities did not exceed 0.15 of the average diameter of the ingot. The other four ingots were divided into four sections according to the diameter of shrinkage cavity and were forged into stepped shaft forging at different forging ratios to study the effect of shrinkage forging and forging ratio on mechanical properties. It was found that shrinkage holes were reduced or forged after being forged with different forging ratios but any forging used in contact with air at the riser end