大型厚壁管热挤压成形工艺参数优化  

Optimization on hot extrusion process parameters for large thick-walled pipe

作　　者：李琚陈 

机构地区：[1]安徽文达信息工程学院机电工程学院

出　　处：《锻压技术》2018年第1期77-82,共6页Forging & Stamping Technology

基　　金：安徽高校自然科学研究重点项目(KJ2017A650)

摘　　要：以P91钢大型厚壁管为研究对象,基于Deform-3D平台建立厚壁管垂直热挤压过程的有限元仿真模型.选取坯料预热温度T0、挤压比λ、挤压速度v、凹模锥角β和摩擦因子μ为影响因素,以最大挤压力Fmax、成形管平均壁厚davg、模口等效应变均方差εsdv和模口金属流速均方差Vsdv为衡量指标,进行虚拟正交试验.通过实际工业生产,验证了有限元模拟结果的可靠性.研究结果表明：影响Fmax, davg, εsdv, Vsdv的因素主次顺序分别为：λ〉T0〉β〉μ〉v, λ〉v〉T0〉μ〉β, β〉λ〉v≈μ〉T0和v〉T0〉μ〉λ〉β;获得尺寸为Ф720 mm×Ф520 mm×12000 mm的P91钢大型厚壁管热挤压成形工艺参数的取值范围为：T0=1150~1200 ℃, λ=5~7, v=20~60 mm·s-1, β=35°~45°, μ=0.05~0.2.经过实际工业生产验证可知,虚拟正交试验得到的工艺参数较为准确、可靠.For large thick-walled pipe of steel P91,a finite element model of its vertical hot extrusion process was established by the De-form-3D software. The virtual orthogonal experiment was numerically simulated with influential factors of the blank preheating temperature T0,extrusion ratio λ,extrusion speed v,taper angle β of die and friction factor μ and with evaluation indexes of the maximum extrusion load Fmax,the average wall thickness davgof forming pipe,the mean square error of equivalent strain εsdvat die export and the mean square error of metal flow rate Vsdvat die export. The reliability of finite element simulation results were verified by actual industrial production. The results show that the significance sequences of influence on Fmax,davg,εsdvand Vsdvare λ〉T0〉β〉μ〉v, λ〉v〉T0〉μ〉β, β〉λ〉v≈μ〉T0and v〉T0〉μ〉λ〉β,respectively. For the large thick-walled pipe of steel P91 with Ф720 mm×Ф520 mm×12000 mm,the reasonable ranges of forming process parameters are T0=1150-1200℃,λ=5-7,v=20-60 mm·s-1,β=35°-45° and μ=0.05-0.2. The actual industrial production shows that the process parameters obtained by the virtual orthogonal experiments are accurate and reliable.

关 键 词：大型厚壁管 垂直热挤压 P91钢 有限元仿真模型 虚拟正交试验 

分 类 号：TG376.2[金属学及工艺—金属压力加工]