Manufacturing method of hard-base soft-structure internal combustion engine connecting rod

Abstract

The invention discloses a manufacturing method of a hard-base soft-structure internal combustion engine connecting rod. The method includes the following steps of forging of a blank, coarse grinding of end faces, boring, rough boring of a large-head hole and a small-head hole, chamfering of the large-head hole, threaded hole machining, fracture splitting of a large-head end and assembling, accurate grinding of the end faces, semi-fine boring of the large-head hole and the small-head hole, tegular groove milling and oil groove boring, fine boring of the large-head hole and the small-head hole, flat grinding of the large-head end, parkerizing of the small-head hole, and cover removing, cleaning and assembling. The connecting rod comprises the large-head end, a rod body and a small-head end, the large-head end and the small-head end are arranged at two ends of the rod body respectively, the connecting rod is of an integral structure, and a connecting rod cover is arranged at the large-head end of the connecting rod. The manufacturing method is simple in principle, a manufacturing technique of a traditional internal combustion engine connecting rod is improved to provide a feasible and reliable manufacturing technique for the hard-base soft-structure internal combustion engine connecting rod, and particularly precision and performance of a soft structure of the small-head end of the connecting rod are guaranteed. Meanwhile, the method has the advantages of simple technique and low manufacturing cost, and is convenient for batch production.

Description

technical field [0001] The invention relates to the technical field of manufacturing internal combustion engine connecting rods, in particular to a method for manufacturing internal combustion engine connecting rods with a hard base and soft structure. Background technique [0002] The traditional connecting rod is generally composed of the connecting rod body and the small end bushing. The connecting rod small end bushing is an important part of the traditional internal combustion engine connecting rod, and its working reliability is affected by the explosion pressure of the internal combustion engine, the allowable specific pressure of the bearing alloy material, friction Affected by factors such as the position of the surface oil groove, the press-fitting process, the microscopic morphology of the friction surface, and the bending deformation of the piston pin under force, the bush rotation often occurs during use and the oil hole at the small end is blocked, resulting in ...

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Problems solved by technology

Among them, the possible problems of press-fitting the sliding bush include: the fit between the bush and the inner wall of the small head hole of the connecting rod is too poor, the surface of the bush is scratched, which affects the fatigue life of the bush; the bush is pressed along the axis of the connecting rod. Asymmetric installation and exceeding the thickness of the small head will affect the strength of t

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