钢锭开坯过程空洞缺陷闭合过程的数值模拟研究

Numerical Simulation Research on the Closing Process of Cavities Defects in the Ingot Cogging Process

采用数值模拟技术结合实际锻造工艺,研究钢锭开坯过程空洞缺陷的闭合规律。研究结果表明:沿轴线分布的空洞直径为钢锭直径130时,当镦粗压下量为50%时,除难变形区的空洞外,其他位置的空洞都可以闭合;当空洞直径不大于钢锭直径120时,空洞尺寸对空洞闭合表征参数Q的临界值没有影响,其值为0.3;对于镦粗过程难变形区未闭合的空洞,在后续经过5道次拔长,完全可以闭合。该研究结果对钢锭开坯过程空洞缺陷压实具有一定的指导作用。

The numerical simulation technology combined with the actual forging process has been used to study the closure law of cavities defects in the ingot cogging process.The research results show that when the diameter of the cavities distributed along the axis is 130 of the ingot diameter,when the upsetting reduction is 50%,the cavities in other positions can be closed except for the cavities in the difficult-to-deform area;when the cavities are not larger than 120 of ingot diameter,the cavity size has no effect on the critical value of the cavity closure characterization parameter Q,which is 0.3;for the cavity that is not closed in the difficult-to-deform area during the upsetting process,it can be completely closed after drawing with 5 passes.The research results have a certain guiding effect on the compaction of cavities defects in the ingot cogging process.