Combustion chamber throat remelting strengthened piston manufacturing method

Abstract

The invention discloses a method for manufacturing a remelted and strengthened piston at the throat of a combustion chamber. The material of the piston is aluminum alloy or magnesium alloy. The manufacturing steps are: a) rough machining of the piston, the throat of the piston combustion chamber and the bottom of the combustion chamber are the weakest parts of the piston parts, the machining allowance of the throat of the combustion chamber and the bottom of the combustion chamber is 1-3mm; b) cleaning and degreasing of the piston; c) smearing or spraying the surfactant on the throat of the combustion chamber and the bottom of the combustion chamber that need to be remelted; Surfactant formula components include: TiO2, SiO2, CuCl2, MnCl2, four kinds are mixed in the following proportion: TiO21‑30%; SiO21‑30%; CuCl21‑40%; MnCl21‑50%; the above four components After mixing evenly, acetone is used as a solvent according to the mass ratio of 1:3 to 8 to make a suspension; d) the piston is remelted by A-TIG welding method; f) the piston is processed to a finished product after remelting. After the remelting treatment, the microstructure of the aluminum alloy has undergone significant changes, and the microhardness in the remelting zone is about 1.2‑2.0 times that of the piston body. It is beneficial to improve the anti-fatigue ability of the aluminum alloy material, that is, the throat part.

Description

Technical field [0001] The invention relates to a method for manufacturing a combustion chamber throat remelted and strengthened piston. Background technique [0002] At present, the engines for trucks, construction machinery, railway locomotives, and ships are all developing in the direction of high power and high load. The degree of enhancement is increasing, and emission requirements are becoming stricter. Adding ceramic composite materials to the head of the engine piston can improve the thermal fatigue performance of the piston throat, but the use of ceramic composite materials is costly and not suitable for mass promotion and application. Traditional TIG welding technology is TIG (Tungsten Inert Gas Welding) welding. Can not meet the requirements of the combustion chamber throat remelting to strengthen the manufacture of pistons. Summary of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provi...

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Problems solved by technology

Unable to meet the requirements of remelting and strengthening piston manufacturing at the throat of the combustion chamber

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