Study on low cost and free cutting gray cast iron for engine cylinder block

With the development of thin-walled engine block, the engine bears higher and higher pressure, which requires higher strength and fatigue properties of gray cast iron. Further improving the strength of gray cast iron without increasing the production cost has become a problem of great concern to foundry manufacturers. In the production of Luoyang Yituo company, it is found that the melted multi-element alloy additive is used to alloy gray cast iron instead of copper, which can maintain high strength and reduce tool wear. However, the mechanical properties of two kinds of alloyed gray cast iron with copper and multi alloy additives have not been compared in detail, and the machinability of the two kinds of alloyed gray cast iron has not been deeply studied. Based on this, the following research is carried out:

1.Tensile strength, hardness, section sensitivity and other mechanical properties and machinability of multicomponent alloy additives and gray cast iron alloyed with copper alloy in the same furnace and the same inoculant.

2.The tensile strength, hardness, section sensitivity and other mechanical properties and machinability of Gray Cast Iron Inoculated with 75 ferrosilicon inoculant, SRSI inoculant and basi inoculant under the same heat and the same multi-element alloy additives.

3.The tensile strength, hardness, section sensitivity and other mechanical properties and machining properties of multicomponent alloy additives with the same strength in different heats and gray cast iron alloyed with copper alloy.

4.When measuring the cutting performance, the influence of blade reassembly and replacement on the measured cutting force of gray iron castings.

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