汽车散热器用黄铜带水平连铸工艺研究冯立铭11湖北精益高精铜板.docVIP

汽车散热器用黄铜Study on the brass billet technology by horizontal continuous casting for Automobile radiator FENG Li-ming (Hubei lean and high precision copper belt co., LTD,shiyan 442000) ?Abstract: Along with the advance of radiator cooling pipe strip production technology, the new type of high zinc alloy HSn65 0.03 has been applied to realize large-scale production, the main strip adopts horizontal continuous casting process, easy to produce porosity and segregation defects in production process, is the high zinc alloy for horizontal continuous casting HSn65-0.03 the key to the quality is stable. Through the analysis on the industrial HSn65 0.03 horizontal continuous casting strip process characteristics, compared with the ordinary H65 billet horizontal continuous casting process, put forward the HSn65-0.03 the strip of the process control key points. Slab in the composition, microstructure, and study of dezincification layer, this paper expounds the horizontal continuous casting process parameters on the influence law of the strip quality, process control of horizontal continuous casting system proposed, common quality defects and solutions. Key words: Radiator in the car; High zinc alloy; microelement; horizontal?continuous?casting; 0 前言 随着散热器冷却管带材生产技术不断进步，具有国际先进水平的新型耐蚀环保高锌锡黄铜HSn65-0.03已逐渐代替GB/T 11087-2012散热器冷却管专用黄铜带散热器工作条件恶劣，一般位于汽车前端迎风处，不仅要经受风吹雨淋和汽车废气的污染，还要承受反复的热循环和周期性的振动。另外，散热器内长期流动着冷却液对散热器有锈蚀及腐蚀作用。因此，为保证散热器可靠地发挥散热作用，对其材料性能有如下要求：必须具有良好的导热性能，一定的强度和较强的耐腐蚀性，的加工性能及钎焊性能，的经济性。H65黄铜带坯是近年来从国外引进的一种新兴工艺方法，由于对该工艺方法理解掌握的局限性，导致铸坯质量不过关，造成产品的表面起皮、晶间裂，从而影响产品的质量及成品率。随着国民经济的迅猛发展，H65黄铜带以其良好的工艺性能、机械性能和耐蚀、导电、导热等特性，广泛应用于电气、五金、电子电讯、机器制造、计算机接插件、建筑装璜等行业，应用量正逐年增加。常规生产方法是采用半连续铸造大块一热轧开坯的方式。水平连铸生产带坯一冷轧生产出成品的H65带生产工艺与半连续铸造一热轧开坯生产工艺相比，不需要高大的厂房和深井，可以省去设备复杂、投资巨大的热轧开坯，投资少，工艺流程短，作为一种新兴的工艺方法而被铜加工行业所采用。 本实验采用工业水平连铸机生产,对铸锭进行在线取样，进行金相分析、成分及耐锌腐蚀性能对比。水平连铸生产线由熔化炉一保温炉一结晶器(铜水冷套与石墨内衬)一引锭机(牵引机)一铣面机一剪切机一卷取机及附属收屑机构等组成[6]。本文样品使用3吨熔化炉、3吨保温炉生产的16.9*410mm带坯。 1.2 HSn65-0.03与H65黄铜生产工艺对比分析 在国内外汽车散热器铜带的工业生产中，HSn65-0.03工