微槽道半固态成形流动形貌研究  

Study on flow morphology of semi-solid forming for microchannel

作　　者：杜冲 于沪平[1] 张钧铭 贺孟强 申昱[1] DU Chong;YU Hu-ping;ZHANG Jun-ming;HE Meng-qiang;SHEN Yu(Institute of PIelstic Forming Technology and Equipment,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学塑性成形技术与装备研究院,上海200030

出　　处：《塑性工程学报》2021年第6期185-191,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51635005)。

摘　　要：在已有半固态微成形研究的基础上,将半固态技术应用于微槽道成形过程,针对微成形过程中尺度效应带来的充填性较差的问题,提出微槽道触变成形工艺。通过实验成形出具有4个肋板的微槽道特征结构,并采用SEM研究了工艺参数对微槽道肋板流动形貌的影响规律。引入肋板的最大充填率和形状因子对肋板的成形性进行了探讨。结果表明,成形得到的微槽道肋板中的外侧肋板高度大于中间肋板,这一现象与常规尺度挤压不同。在压下量一定的情况下,随着成形温度和挤压速度的增大,外侧肋板的最大充填率下降,形状因子先下降后增大。上述现象可以用半固态材料在成形过程中的触变性和固液共存的微观结构进行很好的解释。Based on the existing research on semi-solid micro-forming,the semi-solid technology was applied to microchannel forming process. In view of the poor filling ability caused by the scale effect in micro-forming process,the thixoforming process of microchannel was proposed. The microchannel characteristic structure with four ribs was formed by experiments,and the influence of process parameters on flow morphology of microchannel ribs was studied by SEM. The maximum filling ratio and shape factor of rib were introduced to discuss the formability of ribs. The results show that the height of the outer rib is higher than that of the middle rib in the formed microchannel ribs,which is different from that in conventional scale extrusion. Under the condition of the same rolling reduction,with the increase of forming temperature and extrusion speed,the maximum filling ratio of the outer rib decreases,and the shape factor first decreases and then increases. The above phenomena can be well explained by the thixotropy and solid-liquid coexistence microstructure of semi-solid materials in the forming process.

关 键 词：半固态 微成形 板料挤压 流动形貌 

分 类 号：TG306[金属学及工艺—金属压力加工]