摘要
麻纤维复合材料的应用是实现汽车轻量化、汽车行业绿色、可持续发展的重要途径之一。针对麻纤维复合材料应用于汽车复杂零部件难以成型及模具成本高昂的问题,提出一种基于模压注塑一体成型的解决方案。首先将麻纤维/聚丙烯复合材料纤维板加热软化后放入模压注塑一体模具中进行模压成型,模具分型面采用插穿结构替代碰穿结构设计,模压过程通过分型面冲切零件轮廓,对于无法通过模压成型的产品背面定位安装结构和主体参数化特征采用注塑麻纤维/聚丙烯成型。模具采用倒装结构设计,模具定模侧设计热流道浇注系统及顶出机构,型腔设计可替换镶件用于冲裁和注塑主体的参数化特征。零件设计导流道连接产品背部独立的安装结构和主体参数化特征,模压结束后通过定模热流道点浇口填充导流道以成型产品背部独立的安装结构和主体参数化特征,待塑料结构冷却固化后,定模侧由油缸驱动的顶出机构将零件顶出脱离型腔。基于该成型工艺设计了一套模压注塑一体模具并运用于实际生产,通过实践证明,该模具结构稳定可靠,零件质量满足设计要求。
The application of hemp fiber composites is one of the important ways to achieve automotive lightweighting,green and sustainable development of the automotive industry.A solution based on integrated molding and injection molding was proposed to address the difficulties in forming complex automotive components using hemp fiber composite materials and the high cost of moulds.Firstly,the hemp fiber/polypropylene(PP)composite fiber board was heated and softened,and then placed into a molding and injection molding integrated mould for molding.The mould parting surface adopted an insertion structure instead of a collision structure design.The molding process cut the contour of the parts through the parting surface.For products that could not be molded,the back positioning installation structure and main parameterized features were molded using injection molding hemp fiber/PP.The mould adopted an inverted structure design,with a hot runner pouring system and ejection mechanism designed on the fixed mould side,and a cavity design that could be replaced inserts for parameterized features of punching and injection molding.The part design guide connected the independent installation structure and main parameterized features on the back of the product.After molding,the guide was filled with a fixed mould hot runner point gate to form the independent installation structure and main parameterized features on the back of the product.After the plastic structure cools and solidifies,the ejection mechanism driven by the oil cylinder on the fixed mould side pushes the part out of the mould cavity.A set of integrated injection molding mould was designed based on this molding process and applied in actual production.It has been proven through practice that the structure of the mould was stable and reliable,and the quality of the parts met the design requirements.
作者
施凯文
沈亮涵
唐高中
何叶春
莫兴漫
SHI Kaiwen;SHEN Lianghan;TANG Gaozhong;HE Yechun;MO Xingman(SAIC GM Wuling Automobile Co.,Ltd.,Liuzhou 545007,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2024年第3期112-118,共7页
Engineering Plastics Application
关键词
麻纤维复合材料
模压注塑
成型工艺
导流道
倒装模具
hemp fiber composite materials
moulded injection molding
molding process
diversion channel
inverted mould
作者简介
通信作者:施凯文,本科,主要研究方向为模具CAD/CAE,模具的开发及管理
