The invention relates to the technical field of
piston pins, in particular to a mirror finishing process method for a
piston pin for a locomotive. The process
route for
machining the mirror surface of the
piston pin comprises the following steps:
forging a blank, annealing, roughly turning the appearance, semi-finely turning the appearance, drilling an oil hole and pre-drilling,
carburizing, finely turning two ends, drilling the oil hole,
quenching, correcting central holes at two ends, roughly
grinding an outer circle, finely turning the appearance, semi-finely
grinding the outer circle,
grinding an inner hole,
polishing the oil hole, marking, finely grinding the outer circle,
machining the outer circle by a mirror surface, and packaging and warehousing after flaw detection. The process
route is reasonable in process allowance design, balanced in production takt, high in
machining efficiency, low in cost and high in generalization performance, and machining equipment is universal equipment. After
quenching, the allowance of the outer circle and the inner hole is removed, and then the oil hole is polished, so that the influence of the oil hole on the roughness of the whole outer cylindrical surface during mirror
processing of the outer circle can be effectively ensured. The oil hole
polishing tool is self-made according to
product characteristics, the problem that small holes are not polished by standard
polishing accessories is solved, and the oil hole polishing tool has extremely high practicability and economical efficiency.