Abstract: A method for manufacturing a piston with a re-molten reinforced combustion chamber throat is provided. The manufacturing steps includes: a) piston rough machining: machining allowances of the combustion chamber throat and the combustion chamber bottom are 1-3 mm; b) piston washing and degreasing treatment; c) coating or spraying a surfactant on the combustion chamber throat and the combustion chamber bottom that need to be re-molten, wherein the surfactant formula comprises the components TiO2, SiO2, CuCl2 and MnCl2 that are mixed in percentage: 1-30% of TiO2, 1-30% of SiO2, 1-40% of CuCl2 and 1-50% of MnCl2; after the four components are uniformly mixed, a suspension is prepared by using acetone as a solvent a mass ratio of 1:(3-8); d) re-melting the piston by using an A-TIG welding method; and f) after re-melting, processing the piston into a finished product.

Abstract: A method for manufacturing a piston with a re-molten reinforced combustion chamber throat is provided. The manufacturing steps includes: a) piston rough machining: machining allowances of the combustion chamber throat and the combustion chamber bottom are 1-3 mm; b) piston washing and degreasing treatment; c) coating or spraying a surfactant on the combustion chamber throat and the combustion chamber bottom that need to be re-molten, wherein the surfactant formula comprises the components TiO2, SiO2, CuCl2 and MnCl2 that are mixed in percentage: 1-30% of TiO2, 1-30% of SiO2, 1-40% of CuCl2 and 1-50% of MnCl2; after the four components are uniformly mixed, a suspension is prepared by using acetone as a solvent a mass ratio of 1: (3-8); d) re-melting the piston by using an A-TIG welding method; and f) after re-melting, processing the piston into a finished product.

Abstract: This invention has provided a manufacturing method of semi-finished piston with inner cooling channel through liquid extrusion process, including the following steps: a) produce a wear-resistant cast iron ring with coupling hooks and a common salt and corundum dissoluble core with convex edges; b) fix the wear-resistant cast iron ring in the casting moulds after being aluminized; c) fix the dissoluble core after being pre-heated on the wear-resistant cast iron ring with coupling hooks and convex edges; d) fill in the casting mould with aluminum alloy liquid, compressing and molding. The dissoluble core can be accurately fixed in the casting mould through coupling hooks and convex edges. When the semi-finished piston has been manufactured into finished product, it shall be characterized by high compactness and high mechanical property resulted from liquid extrusion technology.