旋钮开裂原因分析  

Knob cracking cause analysis

作　　者：赖营章 Lai Yingzhang(Lanzhou Changfeng Machinery Factory,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州长风机器厂,甘肃兰州730070

出　　处：《橡塑技术与装备》2025年第5期57-60,共4页China Rubber/Plastics Technology and Equipment

摘　　要：注塑件的开裂是我们产品开发和后期市场经常遇到的问题,看似开裂但分析和找到开裂的原因比较复杂,牵涉到整个产品生命周期的各个环节,原材料的类型,原材料的着色过程、配方,原材料的干燥方式,温度时间的设定,产品的结构设计,是否有尖角导致引力集中,壁厚是否过渡均匀,筋位的分布是否合理,模具结构的选择,浇口的形式,位置,模具的冷却方式,产品的顶出方式,注塑机的型号、吨位大小,螺杆的型号、大小,注塑参数设定,温度、速度等方面都会对零件开裂造成影响,如何从众多因素中抽茧拨丝找到关键因素,不仅需要专业的知识,还要科学的方法,从众多复杂的因素中找到最为关键因素,并加以验证证实。本文以一款产品的旋钮开裂为例,从上面提到的各个维度分析、验证,从而找到关键的因素加以验证,改进,不仅解决了产品本身的技术问题,提高了客户的认可度,也从过程中学习了如何科学的分析和解决问题,为今后产品开发,选材,模具设计,工艺设定,提供借鉴和帮助。Cracking of injection molded parts is a common problem in product development and after-sales processes.Although the cracking phenomenon is obvious,its causes are relatively complex,involving various stages of the product life cycle,including the type and formula of raw materials,coloring process and drying method,as well as temperature and time settings.In addition,the structural design of the product(such as stress concentration caused by sharp corners,uniform wall thickness transition,and reasonable distribution of reinforcement positions),mold structure(gate form and position,cooling method),ejection method,injection molding machine model and parameters(screw model and size,temperature,speed,etc.)may all have an impact on part cracking.To accurately identify key causes from numerous factors,not only professional knowledge but also scientific methods are required.This article takes the cracking of a certain product knob as an example,analyzes and verifies it from multiple dimensions mentioned above,and finally determines the key factors and makes improvements.This process not only solves technical problems and improves customer satisfaction,but also provides valuable experience and reference for future product development,material selection,mold design,and process setting.

关 键 词：注塑 模具 开裂 PBT 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]