High-strength engine cylinder cover

Abstract

The invention discloses a high-strength engine cylinder cover. The high-strength engine cylinder cover is manufactured from a gray cast iron material added with modified nano-ceramic powder. According to the high-strength engine cylinder cover, the original material components and production process are basically not changed on the basis of the original gray cast iron material; through addition of trace nano-modified powder, the uniformity and the continuity of a metallographic structure of the material are improved and the thermal fatigue strength of a gray iron material is remarkably improved; furthermore, a process for forming an unload groove in a base plate of the cylinder cover is omitted; by adding the nanopowder, the thermal fatigue strength and thermal deformation resistance of the gray iron material are obviously improved; the process for forming an unload groove in the base plate of the cylinder cover is omitted, so that the surface machining stress of the base plate is relatively low, the rigidity is relatively high and the flatness is relatively good; by virtue of the technical route, the reliabilities of the cylinder cover and a cylinder gasket can be effectively improved, and the risks of cracking, deformation and cylinder gasket impact can be reduced.

Description

technical field [0001] The invention relates to the field of engines, in particular to a high-strength engine cylinder head. Background technique [0002] The cylinder head of the engine is subjected to high thermal and mechanical loads when it is working. With the continuous development of the engine to high horsepower and high speed, higher requirements are placed on the material of the cylinder head. It not only requires high strength and toughness, but also requires durability. It has good thermal fatigue performance and can work under a large temperature gradient. [0003] The existing high-power diesel engine cylinder head route is vermicular graphite cast iron material cylinder head + cylinder head bottom plate processing unloading groove process, the cylinder head bottom plate processing unloading groove is used to eliminate the thermal stress of the cylinder head, this route has obvious disadvantages: Vermicular graphite cast iron material has high residual stress,...

AI Technical Summary

Problems solved by technology

[0003] The existing high-power diesel engine cylinder head route is vermicular graphite cast iron material cylinder head + cylinder head bottom plate processing unloading groove process, the cylinder head bottom plate processing unloading groove is used to eliminate the thermal stress of the cylinder head, this route has obvious disadvantages: Vermicular graphite cast iron material has high residual stress, poor thermal conductivity, large thermal deformation, poor manufacturability (casting performance and machining performance) and high cost; the processing cost of cylinder head bottom plate processing unloading groove is relatively high, reducing the cylinder head bottom plate Rigidity, there is a risk of local flushing of the cylinder gasket, and the fire sealing ring between the cylinder and the cylinder in the cylinder gasket needs to be partially increased with a sealing compensation plate, the cost of the cylinder gasket increases, and the risk of missing installation and assembly misplacement increases

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