CAJ | 학술논문

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。
대0.3 mm취향성규강진행료원반전분절실험，연구료규강편분절단면형모특정급기손상형모。규강편분절단면제료탑각、전절대、단렬대화모자등전형특정외，환존재량류손상형모，일류시가공측향간극변화인기적결함，표현위태계상단렬대、이차전절대등；령외일류시유규률적경사화흔화점갱。연구료경사화흔적형모특정급기형성궤리，분석발현경사화흔적경사각도γ화도구적교입각α대소기본일치，차반수분절과정관천정개단면，경사화흔적형성여도구마손형모화규강금상결구밀절상관。도구마손조성적도구외연조조도변차，돌출적WC경질점대규강적조대정립산생리삭작용，연착원반도화규강접촉계면인기정립련천착위활이，최종형성경사화흔。
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.