锌层对镀锌薄板DX51D+Z成形极限的影响及成形改善  

Influence of Zinc Layer on Forming Limit of Galvanized Sheet DX51D+Z and its Potential for Enhancement in Forming

作　　者：李柏君 陈海龙 LI Bojun;CHEN Haiong(Shandong Iron and Steel Group,Rizhao Co.,Ltd.,Rizhao 276800,China)

机构地区：[1]山东钢铁集团日照有限公司,山东日照276800

出　　处：《山东冶金》2024年第3期36-39,共4页Shandong Metallurgy

摘　　要：为研究锌层对镀锌薄板DX51D+Z的成形影响,利用三维光学应变测量系统对该钢板开展成形极限检测,获得冲压失效时的主次极限应变点描绘成的成形极限曲线(Forming Limit Curve),并与去锌层基板对比测试,发现锌层对镀锌薄板成形性能存在一定负面影响。在特定的应变状态下,镀锌薄板DX51D+Z比去除锌层基板的成形极限低5%~12%。通过观测相关点的应变分布,发现镀锌钢板成形受润滑条件影响显著,可以采用3层0.05 mm聚乙烯和0.1 mm凡士林进行改善,经试验验证,改善润滑条件可以有效地促进镀锌DX51D+Z成形拱顶部位的应变均匀分布,极限主应变得到约9%的提升。In order to study the forming effect of zinc layer on galvanized sheet DX51D+Z,the FLC(Forming Limit Curve),which is represented by the primary and secondary limit strain points during stamping failure,is detected by a three-dimensional optical strain measuring system.It is found that zinc layer has a certain negative effect on the formability of galvanized sheet.Under the specific strain state,the forming limit of galvanized sheet DX51D+Z is 5%-12%lower than that of the substrate with zinc layer removed.By observing the strain distribution of relevant points,it is found that the forming of galvanized steel sheet is significantly affected by lubrication conditions,and three layers of 0.05 mm polyethylene and 0.1 mm Vaseline can be used to improve that.The experimental results show that the improvement of lubrication conditions can effectively promote the uniform distribution of strain in the forming vault of galvanized DX51D+Z,and the ultimate principal strain is increased by about 9%.

关 键 词：镀锌薄板DX51D+Z 锌层 光学应变测量 成形极限曲线 

分 类 号：TG174.4[金属学及工艺—金属表面处理]