取向硅钢横剪切口边缘绝缘涂层的破损形貌分析

Damage Morphology of Insulating Coating on Edge of Cross Shear of Grain-oriented Silicon Steel

采用斜刃横剪的加工方式对厚度为0.23mm的取向硅钢进行加工,研究加工过程中取向硅钢表面绝缘涂层的破损情况。在剪切加工过程中,取向硅钢表面由T2涂层(磷酸铝)与C2涂层(硅酸镁)组成的绝缘涂层在刀具作用下发生破损,其破损形貌分为裂纹区、压碎区以及剥落区。裂纹区和剥落区出现在塌角侧表面,而压碎区出现在毛刺侧表面。随着剪切侧隙的增加裂纹区宽度增大,压碎区基本保持稳定,剥落区略微增加。随着剪切速度的增加,毛刺侧表面涂层破损宽度先减小后增大。同时可观察到剥落区绝缘涂层发生了两种剥离形式,一种是T2涂层与C2涂层之间的层间剥离,另一种是C2涂层与基体之间发生的界面剥离。

Surface insulation layer damage of grain-oriented silicon steel was studied in this paper.The 0.23 mm grain-oriented silicon steel was processed in advance by oblique cutting shear.Results show that,the insulating layer is composed of T2 coating(AlPO4)and C2 coating(MgSiO4).During the shearing working processes,the insulation coating of the grain-oriented silicon steel will damage by the cutter,its morphology is divided into cracking area,crushing zone and spalling area.Cracking area and spalling area appear on the corner collapse,and crushing area appears on the burr side.With the increase of the shearing clearance,the width of the cracking area increases,the crushing zone is basically stable,and the spalling area increases slightly.With the increase of cutting rate,the burr side coating damaged width decreases first and then increases.Spalling area exhibits two insulating coating spalling forms,the interlayer peeling between T2 coating and C2 coating and the interface peeling between C2 coating and substrate.