Welding type single piece piston in forged steel with close internal cooling oil pocket and fabricating method

Abstract

This invention discloses a weld forging steel single-piece piston and its manufacturing method meeting the requirement of high power, high intensification and low discharge including: a piston body containing a piston ring welded to one unit with the piston by laser, an internal cool oil cavity set between them to connect with the internal cavity of the piston by at least two inlet and outlet holes and a bolt hole under the piston.

Description

technical field

[0001] The invention relates to a structure and a manufacturing method of a welded forged steel integral piston with a closed internal cooling oil cavity. Background technique

[0002] At present, the engines used in trucks, construction machinery, railway locomotives and marine engines are all developing towards high power and high load. The material gradually cannot meet the requirements of high power, high reinforcement and low emission of the engine.

[0003] For high-power and high-load diesel engine pistons, there are also hinged pendulum pistons, that is, the piston head and piston skirt are manufactured separately and connected by piston pins. The piston head is made of cast iron or forged steel, and the piston skirt is made of aluminum. Because the piston head and the piston skirt are manufactured separately, this kind of piston increases the processing cost, and it is difficult to form a closed cooling oil chamber, so the cooling effect of the pist...

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