圆盘拉拔紫铜管杂物压入类缺陷研究  

Defects of Impurities Intrusion on Disk Drawing Copper Tubes

作　　者：唐海龙 蔡锋 黄世新 段金梅 李廷鹏 汪红燕 孙永岗 张宗彬 TANG Hailong;CAI Feng;HUANG Shixin;DUAN Jinmei;LI Tingpeng;WANG Hongyan;SUN Yonggang;ZHANG Zongbin(JCC Copper Processing Division,Nanchang 330096,China)

机构地区：[1]江西铜业加工事业部,江西南昌330096

出　　处：《铜业工程》2023年第4期115-121,共7页Copper Engineering

基　　金：江西铜业股份有限公司提升内螺纹合格率的关键技术研究项目(SYEJ2022004)资助。

摘　　要：随着市场竞争的加剧,空调生产厂家对铜管材的质量,尤其是对表面质量的要求渐趋严格。杂物压入是紫铜管加工过程中经常出现的一种表面缺陷,这种表面缺陷不仅会降低铜管的质量,而且还有可能在紫铜管拉拔过程中发生管材断裂,造成产品报废。通过跟踪铜盘管的拉拔过程,分析杂物压入处的形貌和成分,结果发现:圆盘拉拔三道次后,铜管内外表面均有杂物压入,进而导致断管发生。而引起铜盘管拉拔过程出现杂物压入类缺陷的主要原因是外部杂质铁(Fe),硅(Si),氧(O)和其他异物微粒的压入,这些杂物压入点在拉拔力的作用下形成裂纹源并逐渐扩展,最终导致在铜管拉拔过程中出现断管。根据分析结果,通过加强铜原料成分管控和有效控制熔铸铸坯中氧含量,以及提升熔铸、轧制、盘拉等工序环节的5S管理等方面入手,有效减少此类缺陷的产生,进一步提高产品质量。With the intensification of market competition,air-conditioning manufacturers have set strict requirements on the quality of copper pipes,especially surface defects.Intrusion of impurity is the most common surface defect in the drawing process of copper tubes.This defect will reduce the quality of copper tubes during the drawing process and even cause the copper tubes to break and be scrapped.By tracking the drawing process of the copper tube and analyzing the morphology and composition of the impurity pressed place,the results show that after three passes of drawing,impurities are pressed into the inner and outer surfaces of the copper tube,which leads to the occurrence of broken tubes.The main reason for the impurity intrusion defects in the drawing process of copper tube is the intrusion of external impurities,such as iron,silicon,oxygen and foreign particles,and the indentation points of these impurities form crack source and gradually expand under the action of tensile force,eventually leading to broken tubes in the drawing process of copper tubes.Through the control of copper raw material composition,the control of oxygen content in the melting and casting billets and the control of environmental cleanness in the melting and casting,rolling and disc drawing processes,the occurrence of such defects can be effectively reduced,further improving the quality of product.

关 键 词：铜管 圆盘拉拔 杂物压入 断裂 质量控制 

分 类 号：TG356.5[金属学及工艺—金属压力加工] TG359