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Cast iron for machine tool castings and preparation method for cast iron

A casting and cast iron technology is applied in the field of cast iron for machine tool castings and its preparation, which can solve the problems of poor machinability and difficult machining, and achieve the effects of good machinability, low stress and high tensile strength

Inactive Publication Date: 2019-04-16
黄文泰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can increase the strength, it also increases the stress; the machinability is poor and the processing is difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a cast iron for machine tool castings, which is composed of the following components, and the components include by weight percentage:

[0028] C 3.05%; Si 2.25%; Mn 0.9%; CE 3.8%, Cu 0.55%; Cr 0.35% and Sn 0.025%, the balance is Fe and unavoidable impurities; among them, Si / C is 0.73.

[0029] Its preparation method comprises the following steps:

[0030] (1) Use low-carbon cold-rolled steel scraps as raw materials, heat and melt; add 1.5% silicon carbide of the weight of the low-carbon cold-rolled steel scraps to mix and react, detect the content of each element in molten iron and adjust each element until compound According to the recipe, keep warm for 6 minutes;

[0031] (2) After step (1) leaves the molten iron after standing still, add 0.4% composite inoculant of described molten iron weight to the molten iron after step (1) standing still to carry out inoculation treatment;

[0032] (3) At 1520°C, the molten iron after inoculation in st...

Embodiment 2

[0034] This embodiment provides a cast iron for machine tool castings, which is composed of the following components, which include by weight percentage: C 3.0%; Si 2.2%; Mn 1.1%; CE 3.73%; Cu 0.5%; Cr 0.4% and Sn 0.02%, wherein Si / C is 0.73; the balance is Fe and unavoidable impurities.

[0035] Its preparation method comprises the following steps:

[0036] (1) Use low-carbon cold-rolled steel scraps as raw materials, heat and melt; add 1% silicon carbide of the weight of the low-carbon cold-rolled steel scraps to mix and react, detect the content of each element in molten iron and adjust each element until compounding According to the recipe requirements, keep warm for 8 minutes;

[0037] (2) adding 0.4% of the silicon calcium barium inoculant of the molten iron weight after step (1) leaving the furnace to carry out inoculation treatment, containing 70wt% silicon in the composite inoculant;

[0038] (3) Filter the molten iron after inoculation treatment in step (2) at 1530...

Embodiment 3

[0040] This embodiment provides a cast iron for machine tool castings, which is composed of the following components, which include by weight percentage: C 3.1%; Si 2.3%; Mn 0.8%; CE 3.86%; Cu 0.6%; Cr 0.3% and Sn 0.03%, wherein, Si / C is 0.74; the balance is Fe and unavoidable impurities.

[0041] Its preparation method comprises the following steps:

[0042] (1) Use low-carbon cold-rolled steel scraps as raw materials, heat and melt; add 2% silicon carbide of the weight of the low-carbon cold-rolled steel scraps to mix and react, detect the content of each element in molten iron and adjust each element until compounding According to the recipe, keep warm for 5 minutes;

[0043] (2) After the molten iron after step (1) is left to stand is released from the furnace, add 0.4% of the silicon calcium barium inoculant to the weight of the molten iron to carry out inoculation treatment;

[0044] (3) Filter the molten iron after inoculation treatment in step (2) at 1510° C. with a ...

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Abstract

The invention relates to cast iron for machine tool castings and a preparation method for the cast iron. According to the cast iron, pure low-carbon cold rolled steel leftover materials are used as the raw materials, silicon carbide is added after melting to make the pure low-carbon cold rolled steel leftover materials be denatured, then a compound inoculation agent is added for inoculation, and the cast iron with high tensile strength is finally obtained. The cast iron for the machine tool castings and the preparation method for the cast iron have the beneficial effects that the cast iron forthe machine tool castings is low in raw material cost, higher in finished product tensile strength, low in stress and good in cutability, and the precision in machine tool assembling is improved.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to cast iron for machine tool castings and a preparation method thereof. Background technique [0002] The accuracy of the machine tool depends on the high strength and low stress of the machine tool castings. The traditional process uses low carbon equivalent. For example, the commonly used HT300 machine tool casting formula is C 2.9-3.2%; Si 1.7-1.8%; CE (Carbon equivalent) 3.6%; Mn 0.8-1.1%. Although this method can increase the strength, it also increases the stress; the machinability is poor and processing is difficult. Contents of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a kind of cast iron for machine tool castings and its preparation method. During the preparation process, the content of carbon and silicon is increased, so that the ratio of silicon to carbon content is close to 0.75, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08C21C1/08
CPCC21C1/08C22C33/08C22C37/06C22C37/10
Inventor 黄文泰
Owner 黄文泰