A hollow sodium-filled valve

Abstract

The invention discloses a novel hollow sodium-filled valve. The novel hollow sodium-filled valve comprises a valve shell and a solid rod part. The forming method of the valve shell comprises the steps that cross wedge rolling is performed on a steel pipe material for preforming; friction welding sealing is performed on the head of a preformed billet; afterwards, a die forging forming technology is performed, so the valve shell is integrally formed. The valve shell comprises a flared hollow disc part and a hollow rod part which are integrally formed. One end of the hollow rod part is welded to the solid rod part through friction welding, and the diameter of the cross section of the solid rod part is equal to the outer diameter of the cross section of the hollow rod part. The disc end face of the hollow disc part is airtight, and an inner cavity is defined by the disc end face of the hollow disc part, the hollow rod part and the solid rod part and is filled with sodium. The novel hollow sodium-filled valve is convenient to form, capable of saving materials and good in heat dissipation performance.

Description

technical field [0001] The invention belongs to an engine valve of an internal combustion engine, in particular to a novel hollow sodium-filled valve. 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 austenitic heat-resistant steel as a who...

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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