Method for manufacturing piston with re-molten reinforced combustion chamber throat

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 TiO.sub.2, SiO.sub.2, CuCl.sub.2 and MnCl.sub.2 that are mixed in percentage: 1-30% of TiO.sub.2, 1-30% of SiO.sub.2, 1-40% of CuCl.sub.2 and 1-50% of MnCl.sub.2; 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.

Claims

1. A method for manufacturing a piston with a re-molten reinforced combustion chamber throat, wherein the material of the piston is an aluminum alloy or a magnesium alloy, and the method comprises: a) roughly machining a piston, wherein a combustion chamber throat and a combustion chamber bottom of the piston are weakest parts of the piston, and machining allowances of the combustion chamber throat and the combustion chamber bottom range from 1 mm to 3 mm; b) washing and degreasing the piston; c) coating or spraying a surfactant on the combustion chamber throat and the combustion chamber bottom to be re-molten, wherein, the surfactant has a formulation composition comprising four components: TiO.sub.2, SiO.sub.2, CuCl.sub.2 and MnCl.sub.2, and is obtained by mixing the four components in the following mass percentage: TiO.sub.2 1-30%, SiO.sub.2 1-30%, CuCl.sub.2 1-40% and MnCl.sub.2 1-50%, and after the four components are uniformly mixed, forming a suspension of the mixture using acetone as a solvent in a mass ratio of 1:(3-8); d) re-melting the piston by A-TIG (Argon arc welding); and e) processing the piston into a finished product after the re-melting.

2. The method according to claim 1, wherein in step d), a specific structure of the piston re-molten by A-TIG welding comprises two re-molten welding seams formed at the piston combustion chamber throat and the piston combustion chamber bottom.

3. The method according to claim 1, wherein in step d), a specific structure of the piston re-molten by A-TIG welding comprises more than two re-molten welding seams formed at the piston combustion chamber throat and the piston combustion chamber bottom.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1(a), 1(b) are a front view and a top view showing the structure of a combustion chamber of a re-molten piston, with two welding seams being formed at a combustion chamber throat and a combustion chamber bottom of the piston;

(2) FIGS. 2(a), 2(b) are a front view and a top view showing the structure of another combustion chamber of a re-molten piston, with two welding seams being formed at a combustion chamber throat and a combustion chamber bottom of the piston;

(3) FIGS. 3(a), 3(b) are a front view and a top view showing the structure the combustion chamber of the re-molten piston which has the same shape as the structure in FIGS. 1(a), 1(b), with more than two welding seams being formed at a part from a combustion chamber throat to a combustion chamber bottom of the re-molten portion; and

(4) FIGS. 4(a), 4(b) are a front view and a top view showing the structure of a combustion chamber of a re-molten piston which has the same shape as the structure in FIGS. 2(a), 2(b), with more than two welding seams being formed at a part from a combustion chamber throat to a combustion chamber bottom of the re-molten portion.

REFERENCE NUMERALS IN THE DRAWINGS

(5) 1. combustion chamber throat, and 2. combustion chamber bottom.

DETAILED DESCRIPTION

(6) The present application is further described with reference to drawings and embodiments

(7) A method for manufacturing a piston with a re-molten reinforced combustion chamber throat is provided. The material of the piston is an aluminum alloy or a magnesium alloy. The method includes the following manufacturing steps:

(8) a) roughly machining piston, wherein a combustion chamber throat 1 and a combustion chamber bottom 2 of the piston are weakest parts of the piston, and machining allowances of the combustion chamber throat 1 and the combustion chamber bottom 2 range from 1 mm to 3 mm;

(9) b) washing and degreasing the piston;

(10) c) coating or spraying a surfactant on the combustion chamber throat 1 and the combustion chamber bottom 2 to be re-molten; wherein the surfactant has a formulation composition including TiO.sub.2, SiO.sub.2, CuCl.sub.2 and MnCl.sub.2, and is obtained by mixing the four components in the following mass percentage (mass ratio): formulation of first embodiment TiO.sub.2 29%; SiO.sub.2 1%; CuCl.sub.2 20%; MnCl.sub.2 50%. formulation of second embodiment TiO.sub.2 20%; SiO.sub.2 15%; CuCl.sub.2 40%; MnCl.sub.2 25%. formulation of third embodiment TiO.sub.2 30%; SiO.sub.2 30%; CuCl.sub.2 39%; MnCl.sub.2 1%. formulation of fourth embodiment TiO.sub.2 19%; SiO.sub.2 30%; CuCl.sub.2 1%; MnCl.sub.2 50%. formulation of fifth embodiment TiO.sub.2 15%; SiO.sub.2 30%; CuCl.sub.2 35%; MnCl.sub.2 20%. formulation of sixth embodiment TiO.sub.2 1%; SiO.sub.2 25%; CuCl.sub.2 25%; MnCl.sub.2 49%. after the above four components are uniformly mixed, forming a suspension of the mixture using acetone as a solvent in a mass ratio of 1:(3-8).

(11) d) re-melting the piston by A-TIG welding. in step d), a specific structure of the piston re-molten by A-TIG welding includes two re-molten welding seams formed at the piston combustion chamber throat 1 and the piston combustion chamber bottom 2; or in step d), a specific structure of the piston re-molten by A-TIG welding includes more than two re-molten welding seams formed at the piston combustion chamber throat 1 and the piston combustion chamber bottom 2.

(12) e) processing the piston into a finished product after the re-melting.

(13) Only representative embodiments of the present application are described and presented herein, in addition to those embodiments, various variations and modifications can be made to the present application without departing from the concept and scope of the present application. For example, the method according to the present application can be utilized to make a combined piston with a head and a skirt portion separated with each other, and the head can be re-molten by A-TIG welding at the combustion chamber throat and the combustion chamber bottom.