PLUNGER OF SOLENOID AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a technique capable of obtaining a plunger wherein frictional resistance is small, operation is excellent, corrosion resistance is high after use for a long term, troublesome lapping is unnecessary in the case of fabrication, productivity is high, and a cost is low. SOLUTION: This plunger is attracted and driven by excitation of a coil in a solenoid and is treated by nitriding and oxidizing.