取向性硅钢板圆盘剪分切断面损伤形貌及倾斜划痕形成机理  

Research on the Damage Morphology of Disc Slitting Surface and the Formation Mechanism of Tilt Scratch for Orientd Silicon Steel Sheet

作　　者：黄宇霄 阎秋生[1] 路家斌[1] 

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《机电工程技术》2015年第5期10-14,共5页Mechanical & Electrical Engineering Technology

基　　金：国家自然科学基金资助项目(编号:51175090)

摘　　要：对0.3 mm取向性硅钢进行了圆盘剪分切实验,研究了硅钢片分切断面形貌特征及其损伤形貌。硅钢片分切断面除了塌角、剪切带、断裂带和毛刺等典型特征外,还存在两类损伤形貌,一类是加工侧向间隙变化引起的缺陷,表现为台阶状断裂带、二次剪切带等;另外一类是有规律的倾斜划痕和点坑。研究了倾斜划痕的形貌特征及其形成机理,分析发现倾斜划痕的倾斜角度γ和刀具的咬入角α大小基本一致,且伴随分切过程贯穿整个断面,倾斜划痕的形成与刀具磨损形貌和硅钢金相结构密切相关。刀具磨损造成的刀具外缘粗糙度变差,突出的WC硬质点对硅钢的粗大晶粒产生犁削作用,沿着圆盘刀和硅钢接触界面引起晶粒连串错位滑移,最终形成倾斜划痕。The disc slitting experiments were conducted to study the damage morphology of slitting surface for 0.3 mm oriented silicon steel sheet. In addition to the typical characteristics of the slitting surface, such as the rollover, shear area, fracture area and burr, there are two types of damage morphology. The one type, such as the ladder-like fracture area and the secondary shear area, is caused by the change of the clearance between the neighboring disc cutters. The another type is regular tilt scratches and pits. The tilt scratches exits in the whole slitting surface in the disc slitting processing, and the tilt angleγof the scratches measured in the experiment and the entering angleαof the disc cutter are almost the same size. Meantime, the formation of the tilt scratches has a closely relationship with the wear morphology of the cutter and the metallographic structure of orientd silicon steel. The roughness of the cutting edge becomes worse as the tool wears, and WC hard spots on the cutter will plough the gross grains of silicon steel, these will make the grains produce dislocation and gliding along the contact interface between the disc cutter and the silicon steel, and the formation of tilt scratches is in the final stage.

关 键 词：取向性硅钢 圆盘剪分切 断面损伤 倾斜划痕 形成机理 

分 类 号：TG113[金属学及工艺—物理冶金]