开槽螺纹对双螺杆挤出均匀性影响的仿真研究  

The Influence of Slotted Thread on the Extrusion Uniformity of Twin Screw by FEM Simulation

作　　者：杨冬冬 刘江林[1,2] 梁建国 赵润田 王治辉 李晓东 陈占春 YANG Dongdong;LIU Jianglin;LIANG Jianguo;ZHAO Runtian;WANG Zhihui;LI Xiaodong;CHEN Zhanchun(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,山西太原030024

出　　处：《塑料工业》2023年第11期102-108,共7页China Plastics Industry

基　　金：国家自然科学基金(52075359,52075361);山西省科技重大专项(20201102003,20181102011);校地合作产业科技引导专项项目(2022XDHZ08);中国博士后科学基金(2020M670710)。

摘　　要：螺纹形式严重影响双螺杆挤出材料的均匀性。基于Polyflow建立了正螺纹及不同槽数、槽深的开槽螺纹元件下等规聚丙烯混合挤出过程的模拟模型。借助Polystat从停留时间、剪切速率、分离尺度等角度分析了螺纹元件的分散混合能力。结果表明,相比于正螺纹,开槽螺纹建压能力弱,降低了螺杆的挤出能力,但开槽螺纹有利于物料的反流及物料在螺杆内的停留时间;当一周开槽数为6且槽深为4 mm时,物料所受剪切速率最大,比正螺纹大22 s~(-1);当一周开槽数为8且槽深为4 mm时,其分离尺度相比于正螺纹元件降低了40%,其破碎效果相比于正螺纹提升了38%,更有利于粒子的分布混合及分散混合,提升物料的均匀性。Thread form seriously affected the uniformity of twin-screw extrusion material.The extrusion process of polypropylene was simulated under slotted thread element with different slot number and slot depth by Polyflow.The mixing ability of threaded components was analyzed by Polystat from residence time,shear rate and separation scale.The results show that comparing with the normal thread,the slotted thread has weak pressure building capacity,which could reduce the extrusion capacity of the screw,but the slotted thread is beneficial to the material's reflux and residence time in the screw.When the circumferential slot number is 6 and the slot depth is 4 mm,the shear rate of the material reach to the maximum,which is 22 s-1 larger than that of the normal thread.When the circumferential slot number is 8 and the slot depth is 4 mm,the separation scale is reduced by 40%comparing with the normal thread component,and the crushing effect is increased by 38%comparing with the normal thread component,which is more conducive to the distribution and dispersion of particles mixing,improving the uniformity of materials.

关 键 词：开槽螺纹 模拟仿真 物料反流 均匀性 双螺杆 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]