超低碳冷轧带钢边部剪切质量影响因素分析及改进措施  

Analysis of influence factors on edge trimming quality of cold rolled ultra-low carbon strip and its improvement measures

作　　者：蔡顺达 王金星[3] 孙荣生 邹明聪 李志强[3] 郑麟飞 CAI Shunda;WANG Jinxing;SUN Rongsheng;ZOU Mingcong;LI Zhiqiang;ZHENG Linfei(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,China;Ansteel Iron and Steel Research Institute,Anshan 114009,China;Ansteel Cold Rolling Plant,Anshan 114021,China;Kobelco Angang Auto Steel Co.,Ltd.,Anshan 114021,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院,辽宁鞍山114009 [3]鞍钢股份有限公司冷轧厂,辽宁鞍山114021 [4]鞍钢神钢冷轧高强汽车钢板有限公司,辽宁鞍山114021

出　　处：《轧钢》2024年第6期44-48,共5页Steel Rolling

基　　金：辽宁省自然科学基金项目(2022-MS-450)。

摘　　要：针对超低碳冷轧带钢在生产过程中剪边工序易产生锯齿边和毛刺缺陷等问题,通过对不同剪切工艺参数、其基料不同位置及板形状态下的剪边质量进行讨论,基于力学性能、微观组织和断口形貌的分析,明确了原料特征及剪切工艺对带钢边部剪切质量的影响,提出了剪边质量的工艺控制方案。剪边断口形貌分析结果表明:剪切后带钢边部断口形貌沿带钢厚度方向可分为剪切区域和断裂区域,且不同强度、剪切工艺及板形状态下两种区域在厚度方向的占比存在显著差异;随着带钢强度的提升,剪切区域在厚度方向的占比显著提升;剪刃间隙值对剪边质量的影响显著高于上下剪刃重叠量的影响,随着剪刃间隙值的增加,剪边断口形貌中的剪切区域占比显著减小;带钢边部浪形的存在使得剪切断口出现斜切区域和毛刺区域,同时剪切区域与断裂区域之间分界线波动较大,严重影响带钢剪边质量。通过调整剪刃间隙值和重叠量、控制剪切长度及矫直长度、控制胶套和剪刃磨损程度等控制措施,实现了超低碳钢冷轧带钢边部剪切质量的提升。Aiming at the problems of zigzag edges and burr defects that readily occur during the edge trimming process in the production of cold rolled ultra-low carbon strip,its edge trimming quality under different trimming process parameters,and different positions and shapes of the base strip were discussed.Based on analyses of mechanical properties,microstructure,and fracture morphology,the impact of base material characteristics and trimming processes on the edge trimming quality of the strips are clarified.Furthermore,a process control scheme is proposed to improve the edge trimming quality of base material for cold rolling.The analysis of the fracture morphology of the edge shear indicates that the fracture morphology of the strip edge after trimming can be divided into a trimming zone and a fracture zone along the thickness direction of the strip,and there are significant differences in the proportion of these two zones in the thickness direction under different strengths,trimming processes,and strip shapes.As the strength of the strip increases,the proportion of the trimming zone in the thickness direction significantly rises.The influence of the blade gap value on the edge trimming quality is significantly greater than that of the overlap between the upper and lower blades.As the bladegap value increases,the proportion of the trimming zone in the fracture morphology of the edge shear decreases significantly.The presence of wave shapes on the strip edge results in the appearance of oblique cutting zones and burr zones in the shear fracture,and the boundary between the trimming zone and the fracture zone fluctuates significantly,seriously affecting the edge trimming quality of the strip.By adjusting the blade gap value and overlap value,controlling the trimming and straightening lengths,and managing the wear degrees of the rubber sleeve and blades,the edge trimming quality of cold rolled ultra-low carbon strip has been improved.

关 键 词：超低碳钢 冷轧原料 剪边质量 剪刃间隙值 剪刃重叠量 热轧带钢强度 热轧带钢板形 

分 类 号：TG3[金属学及工艺—金属压力加工]