Engine cracking connecting rod and machining method thereof

Abstract

The invention discloses an engine cracking connecting rod and a machining method of the engine cracking connecting rod. The engine cracking connecting rod comprises a connecting rod body and a connecting rod cover, wherein the connecting rod body is connected with the connecting rod cover in a cracking position of a connecting rod big head through a connecting bolt, U-shaped grooves which are symmetrical relative to a cracking surface are formed in the cracking position of the connecting rod big head, V-shaped splitting grooves are formed in the inner edge, corresponding to the cracking position, of a big head hole of the connecting rod big head, and the V-shaped splitting grooves are symmetrical relative to the cracking surface. The machining method comprises the steps that a forged connecting rod blank with the two symmetrical U-shaped grooves is machined in a rough mode; the connecting rod is cracked into the connecting rod body and the connecting cover; the cracked connecting rod is machined in a fine mode, and a cracking connecting rod finished product is formed. The engine cracking connecting rod and the machining method of the engine cracking connecting rod can lower the cracking difficulty, guarantee the cracking effect, reduce production work procedures, improve reset accuracy after cracking, and guarantee the overall performance of the connecting rod.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an engine breakable connecting rod and a processing method thereof. Background technique [0002] The engine is the heart of the car, and the connecting rod, as an important part of the engine, bears high periodic impact force, inertial force and bending force during the working process. The manufacturing quality of the connecting rod directly affects the performance and reliability of the engine, which requires the connecting rod to have high strength, toughness and fatigue resistance. With the development of automobile manufacturing technology, the engine tends to be lighter in weight and simpler in structure, and the manufacturing technology and process of connecting rods have also undergone great changes. [0003] The traditional flat notch connecting rod adopts separate processing technology, and the specific process is: rough grinding two planes → writing the p...

AI Technical Summary

Problems solved by technology

The flat notch connecting rod relies on the precision machining of the connecting rod bolts and bolt holes to realize the positioning. The reset accuracy of the big head hole of the connecting rod is not high, and the separation surface of the big head needs to be broached and ground. The structural design of the connecting rod bolt hole and the overall The processing technology is complicated, and the machining accuracy of the bolt holes is required to be high. At the same time, the numerous processes will also lead to high investment in machine tools and high production costs.

[0004] In order to improve the competitiveness of products, major automobile manufacturers attach great importance to the research and development of high-strength, lightweight, low-cost connecting rod materials and manufacturing technologies; at the same time, connecting rod breaking processing technology (also known as connecting rod cracking) as A new manufacturing process was developed in the 1990s in the developed countries of the automobile industry and gradually applied to the field of mass production. It fundamentally changed the traditional connecting rod processing method with a novel concept; but the existing The processing method of the broken connecting rod is more complicated, and there are many processes, and the big hole of the processed broken connecting rod is easy to deform, so that the bearing capacity, shear resistance and assembly quality of the connecting rod are poor

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