金属板材无毛刺精密分切新工艺分切断面形貌特征

Study of section morphology characteristics in precision slitting technology with burr-free for sheet metal

基于负间隙冲裁加工原理,针对圆盘剪纵向分切加工,通过分析控制分切过程的材料应力状态,将分切过程分解为塑性剪切和压迫分离两个阶段,提出金属板材无毛刺精密分切新方法,即塑性剪切压迫分离精密分切工艺。采用镀锌板对无毛刺精密分切新工艺加工过程进行实验研究,分析塑性剪切压迫分离精密分切材料变形过程及板材受力特点;通过显微形貌观察,研究无毛刺精密分切新工艺分切断面的双塌角、双剪切区、中部剪切断裂区的形貌特征,并与传统圆盘剪分切工艺的分切断面特征进行对比。结果表明,采用塑性剪切压迫分离精密分切新工艺,可以消除分切毛刺从而提高金属带材的质量。

Based on principle of negative clearance blanking processing, the disc-cutter slitting process was considered as two stages, the plastic shearing and the oppression separation, in order to control material stress states in slitting process. This paper proposed a new disc-cutter slitting method, i.e. the plastic shearing oppression separation precision slitting technique. Precision cutting technology with burr-free was researched by the experiments for the galvanized sheet. The material deformation process of plastic shearing oppression separation and plate mechanical characteristics were analyzed. The microscopic morphology characteristics of the slitting section by the new technique were studied, including double rollover, double shear and fracture of the central section, and compared with the slitting section of the traditional disc-cutter shearing process. The experimental study indicated that the plastic shearing oppression separation precision slitting technique could eliminate burr and improve the slitting quality.