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Technology for producing spheroidal graphite cast iron for engineering machinery

A production engineering and machinery technology, applied in the field of ductile iron production for construction machinery, can solve the problems of reducing the service life of construction machinery, affecting the use of construction machinery, distortion and deformation, etc., to ensure stability, improve wear resistance, improve plasticity and stability. The effect of toughness

Inactive Publication Date: 2014-01-29
XUZHOU NIUTOUSHAN CASTING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing nodular cast iron for construction machinery is often distorted and deformed due to excessive load, and its performance is damaged, which greatly affects the use of construction machinery and reduces the service life of construction machinery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Production excavator engine casing adopts technique of the present invention, and concrete process is as follows:

[0012] 1) Put the raw materials coke, limestone, fresh iron, returned iron, scrap steel, and ferroalloy into the cupola according to the ratio of 0.5:5.0:1.5:1.5:0.15, preheat and start smelting. The temperature of molten iron is 1450°C;

[0013] 2) Add boron alloy with a ratio of 0.015% in the tapping ladle, pour the molten iron from the cupola into the ladle, and perform boronization treatment on the molten iron;

[0014] 3) Lift the boronized ladle to the processing trolley, cover the ladle and start the wire feeding machine, and then the wire feeding machine feeds the spheroidized cored wire and inoculated cored wire in sequence through PLC program control Spheroidizing and inoculating the molten iron in the ladle, wherein the proportion of the nodulizing agent in the ladle is: Y: 5%, Mg: 6%, Si: 37%, Ca: 1%, Sb: 3% and unavoidable trace elements, the...

Embodiment 2

[0021] The production of the oil cylinder shell for the crusher adopts the process of the present invention, and the specific process is as follows:

[0022] 1) Put the raw materials coke, limestone, fresh iron, returned iron, scrap steel, and ferroalloy into the cupola according to the ratio of 0.6:6.0:2.0:1.6:0.15, preheat and start smelting. The temperature of molten iron is 1450℃;

[0023] 2) Add boron alloy with a ratio of 0.015% in the tapping ladle, pour the molten iron from the cupola into the ladle, and perform boronization treatment on the molten iron;

[0024] 3) Lift the boronized ladle to the processing trolley, cover the ladle and start the wire feeding machine, and then the wire feeding machine feeds the spheroidized cored wire and inoculated cored wire in sequence through PLC program control Spheroidizing and inoculating the molten iron in the ladle, wherein the proportion of the nodulizing agent in the ladle is: Y: 5%, Mg: 6%, Si: 30%, Ca: 1%, Sb: 3% and unav...

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Abstract

The invention discloses a technology for producing spheroidal graphite cast iron for engineering machinery and belongs to the field of metallurgy. The technology comprises the following steps of feeding raw materials into a cupola furnace for smelting according to a proportion, adding 0.015 percent of boron alloy into a tapping ladle, flushing molten iron into a casting ladle from the cupola furnace to form iron boride, and forming a borided layer on the surface of the cast iron to improve the abrasion resistance of the cast iron; and then sequentially performing balling treatment and inoculation treatment on the molten iron casting ladle through a wire-feeding machine controlled by a PLC (programmable logic control) system, wherein components of a balling agent and an inoculation agent are uniform, so that the stability of the molten iron component is guaranteed; the PLC system can calculate the content of elements, such as P, S and Ti in the balling agent and the inoculation agent, which greatly affect the performance on the site at the same time to guarantee precision quantification of performance elements in the spheroidal graphite cast iron, so that the plasticity and the toughness of the cast iron are further improved; therefore, the usability of the produced spheroidal graphite cast iron for the engineering machinery is guaranteed.

Description

technical field [0001] The invention relates to a process for producing nodular cast iron for engineering machinery, which belongs to the field of metallurgy. Background technique [0002] Ductile iron is a new type of high-strength cast iron material. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance. . Ductile iron for construction machinery is used in construction machinery with high power and working intensity. Existing nodular cast iron for construction machinery is often distorted and deformed due to excessive load, and its performance is damaged, which greatly affects the use of construction machinery and reduces the service life of construction machinery. Contents of the invention [0003] Aiming at the above-mentioned problems in the prior art, the present invention provides a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D1/00C22C33/08C22C37/10
Inventor 金连胜蔡青李化刚
Owner XUZHOU NIUTOUSHAN CASTING IND
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