Processing method of engine connecting rod

Abstract

The invention provides a processing method of a connecting rod, applied in the field of an engine connecting rod. The processing method comprises the following steps: a) processing a bolt connecting hole (3) on a broken cross-section (10) of a connecting rod blank (1); b) arranging a preprocessing stress groove (4) on the edge of the connecting rod blank (1), and arranging a precrack groove (6) at the inner side of a connecting rod large-head hole (5); c) applying a cracking stress F (7) vertical to the predetermined broken section to the connecting rod large-head hole (5) on cracking processing equipment of the connecting rod; d) meshing a broken connecting rod body (2) and a connecting rod cover (9), penetrating with a bolt (11) and screwing tightly; and e) changing the finish-boring carried out in the connecting rod large-head hole (5) into a processing method of honing technique. The processing method greatly reduces the quantity of procedures, and improves the production efficiency; in addition, after the connecting rod body is separated from the rod cover, the separating surfaces of the rod and the cover can be meshed completely, and extra bolt positioning holes do not need to be added.

Description

technical field [0001] The invention relates to the field of an engine connecting rod, more specifically, relates to a processing method of an engine connecting rod. Background technique [0002] The function of the connecting rod is to transmit the force borne by the piston to the crankshaft, so that the reciprocating motion of the piston is converted into the rotational motion of the crankshaft. In the process of transmitting force, the connecting rod bears high periodic impact force, inertial force and bending force. This requires that the connecting rod should have high strength, toughness and fatigue performance. At the same time, because it is an important moving part of the engine, it requires high weight accuracy. With the development of the automobile industry, the manufacturing process of the connecting rod is also continuously improved. The main process of the traditional mechanical processing method is to rough mill the forging blank first, grind the two sides...

AI Technical Summary

Problems solved by technology

This kind of machining process is complex, costly, low in efficiency, and difficult to guarantee machining accuracy. If the rigidity of the connecting rod is not enough, the big head hole will be out of round and cause the big head bearing bush of the connecting rod to be burned due to oil film damage: the connecting rod shaft is bent, causing Piston and cylinder eccentric wear, piston ring air leakage and oil blow-by, etc.

At the same time, because the big end of the connecting rod of a heavy-duty diesel engine bears a large load, the roughness and cylindricity of the inner surface of the big end hole are very high, and the tool marks on the inner surface of the big end hole during boring are also easy to cause the connecting rod bearing to rotate in the big end hole. catastrophic damage to the engine

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