Metal Washer for ESC/ABS Magnet Solenoid
The washer's center hole must be concentric and coaxial with the housing's center hole. The bright band on the center hole and the outer dimension cutting edge must exceed 95%, which requires fine blanking to achieve. Perpendicularity of the outer cutting edge is held to 0.03mm max, and parallelism between the upper and lower faces is also 0.03mm max.
Case Review
This washer is used on ESC/ABS electromagnetic coils and is supplied to Betheli Automotive Safety Systems Co., Ltd. It goes into new energy vehicles, so the specs are tight: no burrs allowed, must pass a high salt spray test, and the surface finish has to be clean.
Product process: cold-rolled steel, two-up blanking, fine blanking in two hits, roller deburring, then barrel Zn-Fe plating.