Special-shaped water-soluble salt core, manufacturing method and application thereof

Abstract

The invention relates to a special-shaped water-soluble salt core, a manufacturing method and application, and belongs to the technical field of internal combustion engine part manufacturing. The saltcore is annular, the section of the salt core is in a special shape, the section of the salt core comprises a top, a middle and a bottom, the top is close to the top face of a piston, and the top issemicircular. The bottom is in an arc shape, the two sides of the middle are respectively a straight line and an arc line, the arc line side of the middle is closest to a combustion chamber, and the outer side face of the top and the outer side face of the arc line side of the middle are provided with circular grooves. Through the special-shaped structural design of the salt core, the surface areaof the salt core is increased, after the salt core is dissolved by water, the surface area of an inner cooling oil cavity formed in the position, nearby the combustion chamber, of the head of the piston is increased, namely, the heat dissipation area is increased, after cooling oil enters the inner cooling oil cavity, rapid heat exchange between the cooling oil and an aluminum alloy of the head of the piston is achieved, and compared with a uniform-section inner cooling oil cavity, the heat exchange efficiency is improved by 5%-10%.

Description

technical field [0001] The invention relates to a special-shaped water-soluble salt core and its production method and application, belonging to the technical field of internal combustion engine parts manufacturing. Background technique [0002] The piston is the "heart" part of the engine and the most severe part under the working conditions of the engine. It transmits power in high-speed reciprocating motion, and at the same time it bears extremely high mechanical and thermal loads. With the development of supercharging technology, the maximum burst pressure and average effective pressure of high-power medium-speed diesel engines are constantly increasing, especially in terms of reducing fuel consumption, one of the means is to increase the burst pressure. In order to further meet emission requirements and pursue better economy, the development trend of pistons is to withstand higher mechanical loads and thermal loads on the premise of ensuring appropriate size, weight and...

AI Technical Summary

Problems solved by technology

[0007] At present, most aluminum alloy pistons of internal combustion engines on the market have internal cooling oil chambers with equal cross-sections. With the further increase of explosion pressure and power, the heat dissipation effect of internal cooling oil chambers with equal cross-sections is limited, and the heat generated by combustion cannot be quickly dissipated. The cooling oil is taken away, and the thermal influence of the piston ring groove and the combustion chamber is increased

Under the same structural strength and stress conditions, the cooling effect of the internal cooling oil chamber with equal cross-section is limited

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