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A pouring process for preventing inner gate shrinkage and porosity of thick and large castings

A technology for large castings and shrinkage porosity, applied in the directions of casting molds, casting mold components, and manufacturing tools, can solve problems such as high scrap rate, poor casting quality, shrinkage porosity, etc. effect of growth

Active Publication Date: 2019-12-13
ANHUI DATIAN CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the conventional casting process, the liquid metal is usually poured directly, and the part where the heat is concentrated at the inner gate is very easy to produce defects such as internal shrinkage porosity and shrinkage cavity due to the temperature imbalance with other parts. , resulting in poor casting quality and inconvenient use
It is difficult for many foundries to overcome the problem of shrinkage and porosity inside castings. Therefore, the casting waste rate is high, the casting cost is high, and the economic benefit is low, which brings great trouble to the staff.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A pouring process for preventing ingate shrinkage porosity of thick and large castings, comprising the following steps:

[0025] (1) Add raw materials such as pig iron, carbon steel, furnace charge and high-carbon ferromanganese into an intermediate frequency induction furnace, raise the temperature to 1500-1520°C, remove impurities 2-3 times after smelting for 40-50 minutes, and obtain crude molten iron for use;

[0026] (2) After removing impurities, conduct infrared spectrum analysis to detect the content of each chemical component, add ferrochromium, ferrovanadium, recarburizer and silicon carbide according to the required content, after adjusting the content of each chemical component, continue to smelt for 10- After 20 minutes, the hot metal is ready for use;

[0027] (3) Grind the inoculant to a particle size of 2-5 mm, and then preheat it. After preheating, take half of the inoculant to cover the bottom of the molten iron ladle, and then add the molten iron in t...

Embodiment 2

[0032] A pouring process for preventing ingate shrinkage porosity of thick and large castings, comprising the following steps:

[0033] (1) Add raw materials such as pig iron, carbon steel, furnace charge and high-carbon ferromanganese into an intermediate frequency induction furnace, raise the temperature to 1500-1520°C, remove impurities 2-3 times after smelting for 40-50 minutes, and obtain crude molten iron for use;

[0034] (2) After removing impurities, conduct infrared spectrum analysis to detect the content of each chemical component, add ferrochromium, ferrovanadium, recarburizer and silicon carbide according to the required content, after adjusting the content of each chemical component, continue to smelt for 10- After 20 minutes, the hot metal is ready for use;

[0035] (3) Grind the inoculant to a particle size of 2-5 mm, and then preheat it. After preheating, take half of the inoculant to cover the bottom of the molten iron ladle, and then add the molten iron in t...

Embodiment 3

[0040] A pouring process for preventing ingate shrinkage porosity of thick and large castings, comprising the following steps:

[0041] (1) Add raw materials such as pig iron, carbon steel, furnace charge and high-carbon ferromanganese into an intermediate frequency induction furnace, raise the temperature to 1500-1520°C, remove impurities 2-3 times after smelting for 40-50 minutes, and obtain crude molten iron for use;

[0042] (2) After removing impurities, conduct infrared spectrum analysis to detect the content of each chemical component, add ferrochromium, ferrovanadium, recarburizer and silicon carbide according to the required content, after adjusting the content of each chemical component, continue to smelt for 10- After 20 minutes, the hot metal is ready for use;

[0043] (3) Grind the inoculant to a particle size of 2-5 mm, and then preheat it. After preheating, take half of the inoculant to cover the bottom of the molten iron ladle, and then add the molten iron in t...

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PUM

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Abstract

The invention provides a pouring process for preventing shrinkage of a gate of a large and thick casting, and relates to the technical field of casting production. The pouring process includes the following steps of raw material mixing, raw material impurity removal, component analysis, component supplementation, inoculation treatment, molten iron slag removal, casting pretreatment, casting molding, cooling molding and shakeout treatment. The pouring process overcomes the deficiencies of the prior art, effectively improves the strength and toughness of the casting, meanwhile effectively promotes nucleation, inhibits growth, refines crystal grains, has a good inoculation effect, and realizes rapid solidification of the casting, the casting has good impact resistance and is convenient to use, the temperature field of the casting reaches the heat balance, shrinkage at the gate of the casting is effectively prevented, and the pouring effect is good.

Description

technical field [0001] The invention relates to the technical field of casting production, in particular to a pouring process for preventing inner gate shrinkage porosity of thick and large castings. Background technique [0002] Castings are metal shaped objects obtained by various casting methods, that is, the smelted liquid metal is poured into the pre-prepared mold by pouring, injection, suction or other casting methods, and after cooling, it is polished and other subsequent processing methods , the resulting object has a certain shape, size and performance. [0003] In the conventional casting process, the liquid metal is usually poured directly, and the part where the heat is concentrated at the inner gate is very easy to produce defects such as internal shrinkage porosity and shrinkage cavity due to the temperature imbalance with other parts. , resulting in poor casting quality and inconvenient use. It is difficult for many foundries to overcome the problem of shrin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08B22C9/02B22D27/04
CPCB22C9/02B22D27/04C22C33/08C22C37/06C22C37/10
Inventor 吴元立张祥徐祥俊
Owner ANHUI DATIAN CASTING