Core-shell structure high-thermal-conductivity wear-resistant composite valve guide pipe and manufacturing process thereof

Abstract

The invention discloses a core-shell structure high-thermal-conductivity wear-resistant composite valve guide pipe and a manufacturing process thereof, and relates to the technical field of powder metallurgy of automobile parts. A core is made of an iron-based alloy powder metallurgy material with better wear resistance, an inner hole contains lubricating oil, and the core shows excellent wear-resistant and self-lubricating properties when being in contact with a valve, a shell is made of high-heat-conduction red copper, heat of the core is efficiently conducted to a cylinder cover for heat dissipation, the actual working temperature of the core is reduced, the abrasion environment is optimized, meanwhile, the good ductility of the red copper is more beneficial to pressing a valve guide pipe into the cylinder cover, the cost advantage is obvious, and the requirement for improving the performance of an engine can be met.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy of automobile parts, in particular to a core-shell structure high thermal conductivity and wear-resistant composite valve guide and a manufacturing process thereof. Background technique [0002] With the increasing performance of the engine and the implementation of the National VI standard for emission of pollutants, the temperature of the exhaust side of the engine is getting higher and higher, and the heat needs to be transferred to the cylinder head through the valve guide. , The valve guide should not only have excellent wear resistance, but also need to take into account high thermal conductivity in order to meet the development needs of modern engines. Although the wear resistance of cast copper conduit at room temperature is weaker than that of iron-based alloy powder metallurgy valve guide, thanks to its high thermal conductivity, the relative working temperature under high temp...

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Problems solved by technology

Although the wear resistance at room temperature of the cast copper conduit is weaker than that of the iron-based alloy powder metallurgy valve guide, thanks to its high thermal conductivity, the relative working temperature under high-temperature conditions is lower than that of the iron-based alloy powder metallurgy valve guide. Wear performance is better than iron-based alloy powder metallurgy valve guide, but the cost is higher

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