Machining process for internal combustion engine expansion breaking connecting rod

Abstract

The invention discloses a machining process for an internal combustion engine expansion breaking connecting rod. The machining process includes the steps of forging and pressing forming, wherein a blank is formed to be a workblank of the internal combustion engine expansion breaking connecting rod; normalizing, wherein the workblank of the internal combustion engine expansion breaking connecting rod meets mechanical property requirements for the workblank; shot blasting and flaw detection, wherein oxide skin on the surface of the workblank of the internal combustion engine expansion breaking connecting rod and generated due to heating in the forging and pressing forming is removed, and it is guaranteed that flaw and folding defects do not exist in the surface of a product; chipping machining, wherein the workblank of the internal combustion engine expansion breaking connecting rod is machined to be an internal combustion engine expansion breaking connecting rod finished product. According to the machining process, parameters of mechanical properties such as the tensile strength, the yield limit, elongation and percentage reduction of area of the connecting rod are all increased to some extent, the mechanical properties of the connecting rod are improved on the whole, the tensile property and the impact resistance degree are greatly improved compared with those of existing materials, and the connecting rod can be well adapted to operating needs of high-power internal combustion engines.

Description

technical field [0001] The invention relates to a process for expanding and breaking connecting rods of an internal combustion engine. Background technique [0002] The expansion connecting rod of the internal combustion engine is the main component that transmits the force in the internal combustion engine. During the operation of the internal combustion engine, the expansion connecting rod of the internal combustion engine bears high periodic impact force, inertia force and bending force, all of which require the connecting rod to have a certain amount of force. High strength, toughness and fatigue resistance, as well as high machining accuracy, at present, C70S6 is mainly used in the production of connecting rods as the material for internal combustion engine expansion connecting rods, and is made by die forging process, heat treatment, and machining processes. , Because die forging has the geometric shape and dimensional accuracy close to the final product, and can impro...

AI Technical Summary

Problems solved by technology

As the technical level of the internal combustion engine is getting higher and higher, the power of the internal combustion engine is also increasing accordingly. When the internal combustion engine expansion connecting rod that was originally processed with C70S6 is used on a high-power internal combustion engine, it will be damaged due to insufficient strength, thus Reduced service life of internal combustion engines