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Preparation method for combined nucleating agent used for casting

A composite inoculant and proportional mixing technology, applied in the field of casting, can solve the problems of low yield, insufficient casting strength, uneven wall thickness, etc., to achieve high yield, ensure processing performance requirements, and improve the effect of strength and hardness

Inactive Publication Date: 2013-11-20
张传海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When casting and producing body shell products, due to the complex structure of the castings, the wall thickness is uneven, some have a thin wall of 7-8mm, and a wall thickness of 30-40mm. Due to its structural characteristics, the hardness difference between the thin wall and the wall thickness is very different. Large, the difference in HB hardness is 40-50, but the customer requires that the hardness must be uniform, and the HB is greater than 180. During the production process, methods such as adjusting the process and using ordinary high-efficiency inoculants, such as increasing the pouring temperature and increasing the inoculant dosage; Calcium, silicon barium, silicon strontium and other inoculants, but the effect is not ideal, the strength of the casting is not enough, and the yield is not high

Method used

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Examples

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Effect test

Embodiment 1

[0008] The preparation method of the composite inoculant for casting is to crush the rare earth ferrosilicon alloy, ferromanganese, ferrosilicon, and silicon barium into 0.5-15mm particles respectively, and the percentage by weight is 30% of rare earth ferrosilicon alloy, 40% of ferromanganese, 20% of ferrosilicon, Mix 10% silicon barium, heat to 400°C, dry, and put it to room temperature to make a composite inoculant for casting. In order to ensure that the s content of molten iron is less than 0.08%, soda ash is added when using a composite inoculant, and soda ash accounts for 1% of the molten iron by weight.

Embodiment 2

[0010] The preparation method of the composite inoculant for casting is to crush the rare earth ferrosilicon alloy, ferromanganese, ferrosilicon, and silicon barium into 0.5-15mm particles respectively, and the percentage by weight is 31% of rare earth ferrosilicon alloy, 41% of ferromanganese, 19% of ferrosilicon, Mix the proportion of 9% silicon barium, heat to 420 ℃, dry, and put it at room temperature to make a composite inoculant for casting. In order to ensure that the s content of molten iron is less than 0.08%, soda ash is added when using a composite inoculant, and soda ash accounts for 1% of the molten iron by weight.

Embodiment 3

[0012] The preparation method of the composite inoculant for casting is to crush the rare earth ferrosilicon alloy, ferromanganese, ferrosilicon, and silicon barium into 0.5-15mm particles respectively, and the percentage by weight is 29% of rare earth ferrosilicon alloy, 39% of ferromanganese, 21% of ferrosilicon, Mix silicon barium with a ratio of 11%, heat to 380°C for drying, and put it at room temperature to make a composite inoculant for casting. In order to ensure that the s content of molten iron is less than 0.08%, soda ash is added when using a composite inoculant, and soda ash accounts for 1% of the molten iron by weight.

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Abstract

The invention discloses a preparation method for a combined nucleating agent used for casting. Rare earth ferrosilicon, ferromanganese, ferrosilicon and bariumsili are smashed into 0.5-15 mm particles, mixed according to weight percentage, heated to 380-420 DEG C and dried. The combined nucleating agent prepared through the preparation method disclosed by the invention can improve strength of castings and rate of finished products.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a preparation method of a composite inoculant for casting. Background technique [0002] When casting and producing body shell products, due to the complex structure of the castings, the wall thickness is uneven, some have a thin wall of 7-8mm, and a wall thickness of 30-40mm. Due to its structural characteristics, the hardness difference between the thin wall and the wall thickness is very different. Large, the difference in HB hardness is 40-50, but the customer requires that the hardness must be uniform, and the HB is greater than 180. During the production process, methods such as adjusting the process and using ordinary high-efficiency inoculants, such as increasing the pouring temperature and increasing the inoculant dosage; Calcium, silicon barium, silicon strontium and other inoculants are used, but the effects are not ideal, the strength of the casting is not...

Claims

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Application Information

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IPC IPC(8): B22D1/00
Inventor 张继军孙启林魏庆英郭传静李岩
Owner 张传海
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