回油盖隧道式二次抽芯机构注塑模设计  

Design of injection mould with a tunnel-two-stage-core-pulling mechanism for oil return cover

作　　者：毛江峰[1] 盛国栋[1] MAO Jiangfeng;SHENG Guodong(Zhejiang Industry Polytechnical College,Shaoxing 312000,China)

机构地区：[1]浙江工业职业技术学院,浙江绍兴312000

出　　处：《工程塑料应用》2024年第6期55-62,共8页Engineering Plastics Application

摘　　要：为解决塑件局部区域复杂特征的脱模困难问题,在注塑模具设计时首先采用局部特征分区域办法将局部难脱模特征集中分离出来,而后依据脱模方向的分布情况再进行同向集成分类,针对各集成后的脱模方向设计单次或多次抽芯机构,即脱模方向集成分类脱模设计法,从而有效地解决塑件脱模方向众多而导致的塑件整件或局部区域脱模设计困难问题。基于上述设计原理,结合润滑盒回油盖塑件的脱模设计困难问题,创新设计了一种隧道式二次抽芯机构。在该机构中,利用一根斜导柱驱动主成型块内的隧道滑块转向驱动主成型块内的另一成型活动块先完成第一次抽芯,此过程中主滑块与主成型块分离,而主成型块维持不动;然后该斜导柱再继续驱动主滑块带动主成型块完成第二次抽芯来实现塑件局部区域的脱模。结合机构运动力学分析,在该机构的结构设计中,主滑块与主成型块的闭合锁紧由楔紧块两侧不同斜角的斜面进行锁紧,其斜角分别为23°和25°,相应地,主滑块的斜导柱斜角取20°,用此参数设计的两次抽芯机构顺利地克服了塑件局部区域脱模机构设计困难难题,应用于塑件模具上,较好地实现了塑件的自动化注塑生产。塑件的模具结构为一种单点点浇口三板模具,一模一腔布局。In order to solve the problem of difficult demoulding of complex local features in plastic parts,the area segmentation method of local feature was first used in injection mould design to separate the local difficult demoulding models from the feature set.Then,based on the distribution of demoulding directions,the same direction integrated classification method was used to design single or multiple core-pulling mechanisms for each integrated demoulding direction,just as“demolding direction integrated classification demolding design method”,effectively solving the problem of difficult demoulding design of plastic parts as a whole or in local areas caused by multiple demoulding directions.Based on the above design principles and combined with the difficulty of demoulding the lubricating-box oil return cover plastic part,a tunnel-two-stage-core-pulling mechanism was innovatively designed.In the mechanism,an angle pin was used to drive the tunnel-slider inside the main formed block to turn and drive another moveable block inside the main formed block for completing the first core pulling.During this process,the main-body-slider separated from the main formed block,while the main formed block remained stationary.Then the angle pin continued to drive the main-body-slider to drive the main formed block to complete the second core-pulling for achieving the demoulding of the local area of the plastic part.Based on the analysis of mechanism kinematics,in the structural design of the mechanism,the closed locking of the main-body-slider and the main formed block was carried out by the angle planes on both sides of the wedge block with different angles of 23°and 25°,respectively.Correspondingly,the angle pin of the main-body-slider had an angle of 20°.The tunnel-two-stage-core-pulling mechanism designed with this parameter has successfully overcome the design difficulties of the demoulding mechanism in the local area of the plastic part,and is applied to the plastic part mould,effectively realizing the automated injecti

关 键 词：润滑盒回油盖 机构创新设计 二次抽芯 隧道滑块 模具结构 

分 类 号：TG243[金属学及工艺—铸造]