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通过间接热力耦合对120 mm厚718塑料模具钢连续淬火、多道次淬火及变频幅淬火3种在线淬火工艺冷却过程温度场和应力/应变场进行了三维数值模拟。结果表明:与连续淬火工艺相比,多道次淬火工艺可获得较小的表心温差、等效塑性应变及等效应力最大值,但等效应力平均值有所增大,且淬火时间较长;与前两种工艺相比,变频幅淬火工艺可获得最小的表心温差、等效塑性应变、等效应力,以及比多道次淬火工艺较短的淬火时间,且由于关闭了部分喷嘴,起到了节水节能的作用,为优化大尺寸718塑料模具钢在线淬火工艺提供参考。
The three-dimensional numerical simulation of the temperature field and stress / strain field during the in-line quenching process of continuous hardening, multi-pass quenching and variable frequency amplitude quenching of 120 mm thick 718 plastic mold steel was carried out by indirect thermal coupling. The results show that, compared with the continuous quenching process, the multi-pass quenching process can obtain a smaller surface temperature difference, equivalent plastic strain and maximum equivalent stress, but the average equivalent stress has increased, and the quenching time Length; Compared with the former two kinds of processes, the variable frequency quenching process can obtain the minimum surface temperature difference, equivalent plastic strain, equivalent stress, and quenching time shorter than the multi-pass quenching process, and as part of the nozzle is closed , Played a water-saving energy-saving effect, to optimize large-scale 718 plastic mold steel online quenching process to provide a reference.