(燕山大學(xué) 國家冷軋板帶裝備及工藝工程技術(shù)研究中心，秦皇島 066004)
摘 要: 對雙輥薄帶振動鑄軋新工藝中振動參數(shù)的影響開展研究。在振動與非振動狀態(tài)下進(jìn)行7075鋁合金板帶鑄軋的對比實(shí)驗(yàn)。構(gòu)建雙輥薄帶振動鑄軋數(shù)值仿真模型，并通過出坯溫度驗(yàn)證模型的準(zhǔn)確性，然后開展對振動鑄軋熔池區(qū)流場及溫度場時域特性的研究。結(jié)果表明：振動對熔池區(qū)溫度場分布存在影響，振動狀態(tài)下Kiss點(diǎn)位置隨時間呈正弦形式波動。同時，通過對流場時域特性的分析，發(fā)現(xiàn)振動存在對熔池區(qū)施加擾動效果的作用。振動存在細(xì)化鑄軋板坯微觀組織并抑制偏析的作用效果。基于振頻、振幅對熔池區(qū)流場及溫度場影響的不同規(guī)律，確立了振動鑄軋工藝最優(yōu)的振動參數(shù)為振幅0.56 mm、振頻20 Hz。
關(guān)鍵字: 振動鑄軋；數(shù)值仿真；時域特性；振動參數(shù)
（National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China）
Abstract:The influence of vibration parameters in the new process of vibration cast-rolling was studied. A comparative experiment of 7075 aluminum alloy cast-rolling under vibration and non-vibration conditions was carried out. A numerical simulation model of vibration cast-rolling was constructed, and the accuracy of the model was verified by experiments. Then the time-domain characteristics of the molten pool flow field and temperature field under vibration condition were studied. The results show that the vibration can not only make the Kiss point position fluctuate sinusoidal with time, but also exert disturbance effect on the molten pool. It is found that the new process can refine the grain and suppress the segregation. Based on the effect of vibration frequency and amplitude on the molten pool, the optimal vibration parameters of this process are amplitude of 0.56 mm and frequency of 20 Hz.
Key words: vibration cast-rolling; numerical simulation; time-domain characteristic; vibration parameters
