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Welded forged steel integrated piston and its producing method

An integral piston, welded technology, applied in the direction of pistons, engine components, machines/engines, etc., can solve the problems of complex formation process of closed oil cavity and low structural strength of piston

Inactive Publication Date: 2007-04-11
SHANDONG BINZHOU BOHAI PISTON
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The forging of the piston blank and the formation of the closed oil chamber are complicated, and the structural strength of the piston is low

Method used

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  • Welded forged steel integrated piston and its producing method
  • Welded forged steel integrated piston and its producing method
  • Welded forged steel integrated piston and its producing method

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Embodiment Construction

[0019] The specific structure and manufacturing method of the present invention are further described below in conjunction with the embodiments given with accompanying drawings.

[0020] As shown in the accompanying drawings, the welded forged steel integral piston of the present invention has a forged head (1) and a forged skirt (6), the head and the skirt are welded and fixed into a piston body, and the ring groove ( 9) There is a cooling oil chamber (3) on the piston body between the combustion chamber (2), and the cooling oil chamber communicates with the inner cavity of the piston body through the oil inlet and outlet holes (8), and there is an annular groove on the skirt below the ring groove ( 7), the annular groove communicates with the inner cavity of the piston body in the long axis direction.

[0021] The head (1) and skirt (6) are welded together through the welding surface (4) below the combustion chamber and the welding surface (10) in the middle of two adjacent ...

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Abstract

The present invention is welded integral forged steel piston and its manufacturing process. The manufacturing process includes the following steps: forging the head blank and the skirt blank; separate heat treatment of the head blank and the skirt blank; coarse machining the head blank and the skirt blank; friction welding the head and the skirt together; machining the ring slot, combustor, pin hole, excircle and oil outlet in the piston; and final surface phosphorizing or graphitizing treatment of the piston. The present invention has raised manufacturability, high integral structural rigidity, lowered weight and low machine oil consumption compared with available integrally cast piston.

Description

technical field [0001] The invention provides a piston for an engine, in particular a forged steel piston and a manufacturing method thereof. Background technique [0002] At present, the engines for trucks, construction machinery, railway locomotives and ships are all developing towards high power and high load, the degree of strengthening is constantly increasing, and the emission requirements are becoming more and more stringent. Although the aluminum piston has the advantage of light weight, it can no longer meet the requirements of high power, high reinforcement and low emission of the engine. In order to meet this requirement, someone has designed a piston with a hinged pendulum structure, that is, the piston head and skirt are separately processed and manufactured, and then connected by piston pins. The piston head is made of cast iron or forged steel, and the skirt is made of aluminum. Material manufacturing. Because the head and the skirt of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/22
CPCF02F3/003
Inventor 林风华马学军张国华王洪民朱俊奎王丽霞高占雨张树山
Owner SHANDONG BINZHOU BOHAI PISTON
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