Production technology of multi-alloy cylinder cover

Abstract

The invention discloses a production technology of a multi-alloy cylinder cover. The production technology comprises the following steps that preparation is conducted, specifically, a stream inoculantincluding 60-65% of Si, 1.0-1.5% of Zr, 0.5-1.5% of Re, 0-0.5% of Al, 2.0-3.0% of Ba and the balance Fe and inevitable impurities is prepared; smelting is conducted, a molten iron raw material is putinto an electric furnace, and machine starting is conducted for melting; a ladle transfer inoculant is added 5-8 min before molten iron is discharged from a trough, and primary inoculation is conducted; and pouring and steam inoculation are conducted, specifically, when the temperature of molten iron is lowered to 1400-1440 DEG C, pouring is conducted for 6 min, secondary inoculation is conductedwhen the stream inoculant is added into the molten iron fluid in the pouring process, cooling is carried out stage by stage, the white cast and shrinkage defects can be decreased through an instant inoculant, the form and distribution situation of graphite in a cylinder cover casting piece are perfected, the strength and hardness of the cylinder cover casting piece are improved, the service lifeis prolonged, and the elongation percentage is reduced.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a production process of a multi-alloy cylinder head. Background technique [0002] Gray cast iron has unique structure and performance. It is one of the most commonly used metal materials for engine parts such as automobiles, agricultural machinery and construction machinery, such as cylinder heads. With the advancement of technology, the mechanical properties of people's engine cylinder heads are increasingly required. High, the mechanical properties of gray cast iron are mainly determined by the matrix structure and the morphology, distribution and content of graphite. Considering the mechanical properties of gray cast iron, the appearance of long, thin and thick graphite flakes should be prevented, and the control of the shape and distribution of graphite is the key to ensure the performance of gray cast iron. [0003] In the existing gray cast iron production methods, the s...

AI Technical Summary

Problems solved by technology

[0003] In the existing gray cast iron production methods, the strength of gray cast iron is often improved by reducing the carbon equivalent and increasing alloy elements. The inoculation process is relatively extensive, and SiFe75 is mostly used as the inoculant. The lack of effect inspection and the difficulty of preventing inoculation decline reduce the fluidity (casting performance) of cast iron and weaken the feeding effect (precision problem) caused by graphite expansion. At the same time, increasing the alloy will increase the cost of the casting, and the alloy composition Fluctuation has an unstable influence on the performance of castings, etc.

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