预应力钢丝缠绕剖分-组合大型挤压筒的热应力分析  

THERMAL STRESS ANALYSIS ON WIRE WINDED SUBDIVIDED-COMBINED LARGE EXTRUSION CONTAINER

作　　者：刘长勇[1,2] 张人佶[1,2] 颜永年[1,2] 林峰[1,2] 张磊[1,2] 

机构地区：[1]清华大学机械工程系,北京100084 [2]清华大学先进材料成形制造教育部重点实验室,北京100084

出　　处：《工程力学》2011年第5期207-211,共5页Engineering Mechanics

摘　　要：预应力钢丝缠绕剖分-组合挤压筒与传统挤压筒相比具有重量轻、疲劳性能好、制造难度与成本低等优势。传统的预应力钢丝缠绕筒体理论计算方法忽略了温度的影响,不适宜于热挤压筒的设计计算。该文采用线性热弹性理论、预应力钢丝缠绕理论以及弹性力学理论对挤压筒在预紧状态、预热状态和工作状态下的应力分布分别进行了分析,得出应力分布的解析公式。理论分析和计算证明,预紧系数、挤压筒内表面温度对稳态温度场下挤压筒的热应力分布起决定作用,通过调整挤压筒的内表面温度和预紧系数可使热应力控制在许用范围内,从理论上证实了在一维稳态温度场假设下预应力钢丝缠绕剖分-组合挤压筒的可行性,目前该类型的挤压筒已应用于我国已建成的360MN/150MN垂直挤压机组中。Wire winded subdivided-combined extrusion containers has a wide range of advantages over traditional extrusion containers such as lower weight,improved fatigue performance,easier to manufacture and lower cost.Classic analytical solutions are derived without considering the influence of temperature which apparently cannot be applied to design a hot extrusion container.The theoretical derivation of stress distribution based on the consumption of a one-dimensional steady state temperature field was conducted.The analytical solution was obtained using linear thermoelasticity,wire winding theory and elasticity.The theoretical analysis and calculations indicate that the pre-stress factor and inner surface temperature of the container have important influence on the thermal stress distribution of the container.Thermal stress can be reduced to a value which is lower than the allowed stress by adjusting the inner surface temperature and pre-stress factor.Extrusion containers designed by this method have been applied to the 360MN/150MN vertical extrusion equipments.

关 键 词：稳态温度场 预应力钢丝缠绕 剖分-组合 热应力 挤压筒 

分 类 号：TG375.43[金属学及工艺—金属压力加工]