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Method for improving performance of alloy cast iron for automobile mold

A technology for alloy cast iron and automobile molds, which is applied in the field of performance improvement of alloy cast iron for automobile molds, can solve the problems affecting the service life of molds, long material processing cycle, general impact resistance, etc., and achieves improved fatigue resistance, low friction coefficient, The effect of improving creep strength

Inactive Publication Date: 2019-11-15
MAANSHAN SANCHUAN MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of the industry, the shortcomings of alloy cast iron mold materials are increasingly exposed: the composition is similar to the corresponding alloy steel, but the material processing cycle is long, the mechanical properties are lower than cast steel, the processing cost is high, the brittleness is large, easy to crack, and the combination accuracy Low wear resistance and impact resistance make the mold seriously damaged when processing large parts, affect the service life of the mold, and cause accident losses caused by fatigue fracture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for improving the performance of alloy cast iron used in automobile molds. After the alloy cast iron is smelted into molten iron, it is poured into a ladle in which modified silica ceramic powder is placed in advance, and spheroidizing inoculation is performed. After the reaction is completed, slag removal and purification are performed. , and then casting and processing into a mould, the preparation process of the modified silica ceramic powder comprises the following steps:

[0020] (1) Weigh 4.5 grams of europium oxide and place it in a beaker, add 30 milliliters of hydrochloric acid solution, stir well, add 10 milliliters of sodium oleate aqueous solution, heat up to 60 ° C, stir and mix well, let stand for 10 hours, add 7.5 grams Zirconium acetate and 20 ml of ethylene glycol aqueous solution were then ultrasonically dispersed for 10 minutes and then transferred to a high-pressure reactor. The reaction temperature was set at 190°C, and the reaction time was...

Embodiment 2

[0030] A method for improving the performance of alloy cast iron used in automobile molds. After the alloy cast iron is smelted into molten iron, it is poured into a ladle in which modified silica ceramic powder is placed in advance, and spheroidizing inoculation is performed. After the reaction is completed, slag removal and purification are performed. , and then casting and processing into a mould, the preparation process of the modified silica ceramic powder comprises the following steps:

[0031](1) Weigh 4.7 grams of europium oxide and place it in a beaker, add 33 milliliters of hydrochloric acid solution, stir well, add 13 milliliters of sodium oleate aqueous solution, raise the temperature to 62 ° C, stir and mix well, let stand for 11 hours, add 7.8 grams Zirconium acetate and 25 ml of ethylene glycol aqueous solution were then ultrasonically dispersed for 12 minutes and then transferred to a high-pressure reactor. The reaction temperature was set at 195°C and the react...

Embodiment 3

[0041] A method for improving the performance of alloy cast iron used in automobile molds. After the alloy cast iron is smelted into molten iron, it is poured into a ladle in which modified silica ceramic powder is placed in advance, and spheroidizing inoculation is performed. After the reaction is completed, slag removal and purification are performed. , and then casting and processing into a mould, the preparation process of the modified silica ceramic powder comprises the following steps:

[0042] (1) Weigh 5.0 grams of europium oxide and place it in a beaker, add 35 milliliters of hydrochloric acid solution, stir well, add 15 milliliters of sodium oleate aqueous solution, heat up to 64 ° C, stir and mix well, let stand for 12 hours, add 8.0 grams Zirconium acetate and 30 ml of ethylene glycol aqueous solution were then ultrasonically dispersed for 15 minutes and then transferred to a high-pressure reactor. The reaction temperature was set at 200°C and the reaction time was ...

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Abstract

The invention relates to the technical field of new material processing and discloses a method for improving the performance of alloy cast iron for an automobile mold. Through the research on the alloy cast iron mold steel structure and material service performance, the low fatigue resistance of the alloy cast iron is solved from internal factors. The comprehensive performance of the mold materialis improved. After the alloy cast iron is smelted into molten iron and poured into a ladle in which the modified silica ceramic powder is placed in advanced, spheroidizing and inoculating are performed. After the reaction is completed, the slag removal purification is performed, and then the pouring forming is performed. In the preparation process of the modified silica ceramic powder, europium oxide and zirconium acetate are used as raw materials, and a rod-shaped nano europium oxide / zirconium oxide composite material is prepared through the reaction; and the nanostructure can prevent intercrystal grain from aggregating and growing and prevent the crack propagation, the good adhesion is shown, and the fatigue of the alloy structure is improved by forming an oxide mass point on the surface of an alloy, so that the prepared mold material has excellent thermal fatigue resistance.

Description

technical field [0001] The invention belongs to the technical field of new material processing, and in particular relates to a method for improving the performance of alloy cast iron used in automobile molds. Background technique [0002] Alloy cast iron refers to cast iron that has special properties by adding alloying elements to ordinary cast iron. The alloying elements usually added are silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, titanium, antimony, tin, etc. Alloy cast iron is divided into low alloy cast iron (alloy element content < 3%) and medium alloy cast iron (alloy element content > 10%) according to the amount of alloy elements added. Alloying elements can change the matrix structure of cast iron, so that cast iron can obtain special physical and chemical properties such as heat resistance, wear resistance, corrosion resistance, non-magnetic and low temperature resistance, so this cast iron is also calle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/08C22C37/04C21C1/10C22C33/08
CPCC21C1/105C22C33/08C22C37/04C22C37/08
Inventor 李孙德
Owner MAANSHAN SANCHUAN MACHINERY MFG CO LTD
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