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Method for casting nodular cast iron with large section

A technology of nodular cast iron and large cross-section, which is applied in the casting field of large-section nodular cast iron. It can solve the problems of anti-spheroidization decline and poor graphite distortion ability, and achieve the effect of improving nodularization and solving graphite distortion.

Inactive Publication Date: 2011-06-15
宁波康发铸造有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

It has a wide range of applications, but for the production of large-section ductile iron, it often has poor resistance to spheroidization recession and graphite distortion.

Method used

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Embodiment approach

[0010] The casting method of large-section nodular cast iron of the present invention, specific embodiment is as follows:

[0011] Add coke, limestone, scrap steel, newborn iron, returned iron, and ferroalloy in the order of smelting materials, and cycle in turn until the bottom edge of the material mouth is added. The total weight of various metal layers is 500 kg, and the thickness of each layer of coke The amount of coke added is based on the height that can make up the bottom of the coke. Limestone is added to the center of the furnace, and the added weight is 30% of the coke weight. After the furnace material is installed, preheat for 20 minutes and start blasting. During the blasting process, observe and control the combustion status in the furnace through the peephole of the tuyere. According to the batch of feeding materials, when the amount of iron is met, prepare for tapping, and prepare for spheroidizing treatment, first according to the requirements Required, load ...

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Abstract

The invention discloses a method for casting nodular cast iron with a large section. The carbon content and the number of graphite pebbles per unit area are increased, so that the problem of fragmented graphite can be solved; the ideal carbon content is 4.1 to 4.3 percent; the silicon content is 2.0 to 2.2 percent; instantaneous inoculation is added on the basis of the original inoculation, namely during pouring, pouring cup inoculation is performed by using 1 percent of No.75 silicon powder with the granularity of between 0.3 and 1mm; generally, common rare-earth-magnesium-silicon-iron alloy is used as nodulizer and has a wide application range, but during production of the nodular cast iron with the large section, decaying spheroidisation resistance and distortion-invariant capacity of the graphite are low; and in order to overcome the disadvantages, the improved scheme of D-2 heavy rare earth nodulizer is adopted, and during spheroidization, the common rare-earth-magnesium-silicon-iron alloy accounts for 60 percent and the D-2 heavy rare earth nodulizer accounts for 40 percent based on the total weight of the nodular cast iron. The method has the advantages that: the problems of graphite distortion, a small number of spheroidal graphite and fragmented graphite are solved, so that the spheroidization of the central position of a casting is improved and the requirement of a template of an injection molding machine can be fully met.

Description

technical field [0001] The invention relates to a casting method of large-section ductile iron, and the specific technical field belongs to the casting technology of producing injection molding machine templates from ductile iron. Background technique [0002] Injection molding machines are widely used in the industrial field. Many metal and plastic molding require injection molding machines, so the working intensity of injection molding machines is relatively high. The template thickness used by many injection molding machine manufacturers is greater than 100mm. Generally, ductile iron castings with a wall thickness greater than 100mm are called large-section ductile iron. Due to the thick cross-section and slow cooling rate, graphite distortion often occurs in the center of the casting or at the hot joint, the number of nodular graphite is reduced, and the structure is coarse. Especially, it is easy to produce fragmented graphite, which reduces the mechanical properties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D3/00
Inventor 马麟斌
Owner 宁波康发铸造有限公司
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