Conformal soluble preform for internal combustion engine piston and piston manufacturing method

Abstract

The invention discloses a conformal soluble preform for an internal combustion engine piston and a method for making the piston. The mass component of the conformal soluble preform is: Na 2 CO 3 : 25%‑50%, mullite powder: 1%‑10%, aluminum titanate powder: 1%‑10%, alumina fiber: 1%‑10%, and the balance is NaCl; the preparation method includes the following steps: 1 ) to NaCl and Na 2 CO 3 Add silicon carbide anti-corrosion crucible in proportion and heat until melting, the temperature is controlled at 750-950°C; 2) Add ground mullite powder and aluminum titanate powder according to the proportion, and keep warm for 10-30min; 3) Add alumina fiber, Stir fully before each pouring, pour into the preheated soluble preform mold after stirring, and obtain the conformal soluble preform; 4) cast the conformal soluble preform after deburring into the piston, and then The prefabricated body is dissolved with water to obtain the internal combustion engine piston with conformal internal cooling oil cavity. The invention can effectively reduce the temperature of the entire piston head mainly including the combustion chamber and the first ring groove, simplify the production process of the soluble preform and reduce the production cost.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine manufacturing, in particular to a conformal soluble preform for internal combustion engine pistons and a piston manufacturing method. Background technique [0002] As the country pays more and more attention to energy conservation and environmental protection, the requirements for internal combustion engine exhaust emission regulations are becoming more and more stringent. In order to improve the comprehensive utilization rate of internal combustion engines and reduce harmful emissions, the power per unit area of ​​internal combustion engines has been continuously increased, and the thermal and mechanical loads of pistons have also been continuously increased, especially pistons for diesel engines. The aluminum alloy piston is the core component of the internal combustion engine. Because it directly contacts high-temperature gas, it withstands high temperature and high pressure,...

AI Technical Summary

Problems solved by technology

However, limited by the molding process of the soluble core of the piston, the soluble core can only be made into a relatively simple shape, and because the soluble core is porous, it is only suitable for gravity casting. When a certain pressure is added during the casting process, the aluminum liquid is easy to enter In the soluble core, the inner cooling oil cavity is blocked

Moreover, the soluble core suitable for die casting has complicated process equipment, low yield, expensive raw materials, and high production cost, which is not conducive to large-scale industrial application.

[0004] Invention patent CN101869963B introduces a method of mixing halide salts, reinforcing agents, and binders after drying, pressing to form, then sintering, and finally turning to form. Due to the limitation of the pressing process, this method is only suitable for making soluble cores. simple shape

[0006] In addition, in the prior art, the soluble core of the internal cooling oil channel is formed by pressing, and the forming method is mostly one side is formed by a mold and the other side is processed, or both sides are processed surfaces

Due to the low strength of the soluble core blank, it is not suitable for complex lathe processing, and the pressing mold itself does not have the ability to produce products with complex shapes. This type of soluble core and its formed internal cooling oil passage cannot minimize the combustion chamber and the first ring groove temperature

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