基于数值模拟的等温挤压速度曲线及获取方法  

Isothermal extrusion speed curve and acquisition method based on numerical simulation

作　　者：王亚非[1] 谭建平[1] 许洪韬 杨武[1] WANG Yafei TAN Jianping XU Hongtao YANG Wu(School of Mechanical and Electronical Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第12期4016-4020,共5页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2009ZX04005-031)~~

摘　　要：为了提高制品质量,使125 MN卧式挤压机实现等温挤压,给出一种易于实现、简易的等温挤压速度曲线及获取方法。首先建立挤压机数值模拟仿真模型,然后在不同挤压速度下分别对其进行等速挤压过程仿真,得到一系列制品出口温度曲线。所得出口温度曲线与设定温度交于一组坐标点,对该组坐标点进行曲线拟合得到随行程变化的挤压速度曲线,进一步转换为速度随时间函数曲线,该函数曲线即为等温挤压速度曲线。依照该速度曲线进行挤压过程仿真实验。研究结果表明:制品出口温度曲线变化平缓,基本实现了等温挤压,验证了所提出的速度曲线有效性和获取方法的合理性。In order to improve the quality of product and realize the isothermal extrusion on the 125 MN horizontal extruder, an isothermal extrusion speed curve and the acquisition method which were easy to be implemented were provided. Firstly, the simulation model of the horizontal extruder was built to simulate multiple iso-speed extrusion processes in different speeds and a series of outlet temperature curves were generated. The curves intersected with the increase of the setting temperature at a group of coordinate points, and a speed curve changing with the stroke was obtained by fitting these points, which was to be converted to the isothermal extrusion speed curve changing with time. The obtained speed curve was used in the extrusion simulation. The results show that the outlet temperature changes gradually and slightly, and the isothermal extrusion is mostly achieved, which verifies the effectiveness of the speed curve and the rationality of the acquisition method.

关 键 词：等温挤压 速度曲线 数值模拟 

分 类 号：TG375[金属学及工艺—金属压力加工]