Hollow sodium filled valve based on cross wedge rolled billet

Abstract

The invention discloses a hollow sodium filled valve based on a cross wedge rolled billet. The hollow sodium filled valve comprises a valve shell, a solid rod and a disc end face plug. The valve shell is preformed by a steel tube through cross wedge rolling and then is integrally formed through a die forging forming process. The valve shell comprises a trumpet-shaped hollow disc and a hollow rod which are integrally formed, and one end of the hollow rod is in friction welding with the solid rod to plug the hollow rod. The diameter of the cross section of the solid rod is equal to the outer diameter of the cross section of the hollow rod. The disc end face plug and an opening of the hollow disc are in friction welding to plug the hollow disc, and an inner cavity is formed by the disc end face plug and the valve shell. The inner cavity is filled with metallic sodium. The hollow sodium filled valve based on the cross wedge rolled billet is convenient to form and good in heat radiation performance, and materials are saved.

Description

technical field [0001] The invention belongs to an engine valve of an internal combustion engine, in particular to a hollow sodium-filled valve based on a cross wedge rolling billet. Background technique [0002] The valve is a precision part that seals the combustion chamber and controls the gas exchange of the internal combustion engine during the working process of the internal combustion engine. It is a key component to ensure the power performance, reliability and durability of the internal combustion engine. The intake valve mainly bears the mechanical load of repeated impact, and its working temperature is 300-400°C, while the exhaust valve is not only subjected to the mechanical load of impact, but also is subject to corrosion of high-temperature oxidizing gas, thermal stress, cone heat hoop stress and Due to the combined effect of gas pressure during combustion, the working temperature of the exhaust valve reaches 600-800°C, and the exhaust valve is made of austenit...

AI Technical Summary

Problems solved by technology

Although the inner cavity of the valve has increased, the material utilization rate of this process is low, and there are many processes, which are prone to stress concentration, and the forming process of the preformed blank of the valve using the electric upsetting process is free deformation, and the temperature and quality are difficult to control.

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