Mirror finishing process method for piston pin for locomotive

Abstract

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.

Description

technical field [0001] The invention relates to a piston pin, in particular to a mirror surface processing method of a piston pin for a locomotive. Background technique [0002] diesel engine [0003] At present, the highest roughness that can be achieved by machining the outer cylindrical surface is Rz1, which cannot meet the requirements of Ra0.025 for the surface roughness of the outer cylindrical surface of the piston pin of the new diesel engine. It is necessary to invent a process for machining the piston pin mirror surface. Contents of the invention [0004] The present invention aims to solve the above-mentioned defects, and provides a method for processing the mirror surface of a locomotive piston pin. [0005] In order to overcome the defects that exist in the background technology, the technical solution adopted by the present invention to solve its technical problems is: the piston pin mirror surface processing method for this locomotive, and the piston pin mi...

AI Technical Summary

Problems solved by technology

[0003] At present, the highest roughness that can be achieved by machining the outer cylindrical surface is Rz1, which cannot meet the requirements of Ra0.025 for the surface roughness of the outer cylindrical surface of the piston pin of the new diesel engine. It is necessary to invent a method for machining the mirror surface of the piston pin.