Quantitative Characterization of the Affected Zones in a Single Crystal Fe-6Si Steel Sheet by Fine Piercing

Micromachines

Kuniaki Dohda¹  Tomomi Shiratori²  Tomoaki Yoshino³  Yohei Suzuki³  Tatsuhiko Aizawa⁴ 

[1] Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA;Faculty of Engineering, University of Toyama, Toyama 930-8555, Japan;Komatsu-Seiki Kosakusho, Co., Ltd., Suwa 392-0012, Japan;Surface Engineering Design Laboratory, SIT, Tokyo 144-0045, Japan;

关键词: motor core;    electrical steel sheet;    single crystal;    plastically affected zone by piercing;    plastic straining;    spinning;   

DOI  :  10.3390/mi13040562

来源: DOAJ

【 摘 要 】

An iron loss in the motor core was often enhanced by formation of plastically affected zones in piercing the electrical steel sheets. A platform methodology to carry out quantitative evaluation of these affected zones in the pierced electrical steel sheets was proposed to search for the way to minimize the affected zone widths. A coarse-grained electrical steel sheet was employed as a work material for a fine piercing experiment under the narrowed clearance between the plasma-nitrided SKD11 punch and core-die. The shearing behavior by the applied loading for piercing was described by in situ measurement of the load-stroke relationship. The plastic straining in the single-crystal electrical steel sheet was characterized by SEM (scanning electron microscopy) and EBSD (electron back-scattering diffraction) to define the affected zone size and to analyze the rotation of crystallographic orientations by the induced plastic distortion during piercing. Integral and differentiation of spin rotation measured the affected zones. The effect of punch edge sharpness on these spin-rotation measures was also discussed using the nitrided and ion-milled SKD11 punch and core-die.

【 授权许可】

Unknown