液芯锻造过程分层模型仿真分析  

Simulation analysis on hierarchical model in liquid core forging process

作　　者：吴永强 付文 王开坤[1] Wu Yongqiang;Fu Wen;Wang Kaikun(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《锻压技术》2021年第3期9-14,20,共7页Forging & Stamping Technology

基　　金：国家重点研发专项资助(2017YFB0701803&2016YFB0701403)。

摘　　要：采用锻造模拟软件Deform-2D,建立了含有固态区、半固态区和液芯区3部分区域的液芯锻造分层模型,计算得到了压下速率为20 mm·s^(-1)、相对压下量为30%时,含有液芯钢锭的温度场的模拟结果,以及等效应力、等效应变随相对压下量变化的曲线,获得了不同相对压下量和坯壳厚度下的固态区、半固态区和液芯区3部分区域的金属流动规律。模拟结果表明:在相对压下量相同的条件下,半固态区受力越大,其变形进行得越充分;钢锭的变形主要由液芯区来承担,这有利于去除大型锻件的芯部缺陷;坯壳厚度越大,钢锭所需的变形力越大。The hierarchical model of liquid core forging containing three regions of solid region,semi-solid region and liquid core region was established by forging simulation software Deform-2D,and when the reduction rate was 20 mm·s^(-1) and the relative reduction amount was 30%,the simulation results of temperature field for ingot with liquid core,the curves of equivalent stress and equivalent strain changing with the relative reduction amount and the metal flow rules in the three regions of solid region,semi-solid region and liquid core region under different realtive reductions and blank shell thicknesses were obtained. The simulation results show that under the same realtive reduction amount conditions,the greater the force in the semi-solid region is,the more sufficient the deformation is. In addition,the deformation of ingot is mainly borne by the liquid core region,which is beneficial to the removal of core defects in large forgings. The greater the thickness of blank shell is,the greater the deformation force required for ingot is.

关 键 词：液芯锻造 分层模型 等效应力 等效应变 Deform-2D 

分 类 号：TG319[金属学及工艺—金属压力加工]