Cold-type special molding sand for integral casting of large cast steel roller and manufacturing method of cold-type special molding sand

A cast steel roll and integral casting technology, applied in casting molding equipment, manufacturing tools, casting molds, etc., can solve the problems of sand inclusion, product scrap, sand sticking, etc., to improve quality, reduce usage, and improve economic benefits. Effect

Active Publication Date: 2014-12-24
成都三强轧辊股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of the cold mold hanging sand formed by traditional molding sand is 15-20mm. If the thickness of the hanging sand is further reduced, it will cause casting defects such as sand inclusion and sticky sand, and in severe cases, the product will be scrapped.

Method used

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  • Cold-type special molding sand for integral casting of large cast steel roller and manufacturing method of cold-type special molding sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A Φ1200×2800 cast steel rough roll integral casting cold casting special sand, which is composed of the following components in weight percentage: 79% quartz sand, 14.5% clay, 1.5% bentonite, and 5% water.

[0015] The quartz sand is composed of the following components in weight percentage, 55% of 6-12 mesh quartz sand, 35% of 20-40 mesh quartz sand, and 10% of 70-140 mesh quartz sand.

[0016] A method for manufacturing special molding sand, weighing 6-12 mesh quartz sand, 20-40 mesh quartz sand, 70-140 mesh quartz sand, clay, and bentonite into a hopper according to the above ratio, and then pouring it into a sand mixer to dry Mix for 3 minutes, then add water and mix for 10-15 minutes. The molding sand made with this ratio has an air permeability greater than 750, a wet compressive strength greater than 0.08MPa, and a dry compressive strength greater than 0.65MPa.

[0017] Such as figure 1 As shown, when using the special molding sand molding of the present invent...

Embodiment 2

[0021] A Φ1000×2600 cast steel rough roll integral casting cold casting special sand, which is composed of the following components in weight percentage, 76% of quartz sand, 15% of clay, 2% of bentonite, and 7% of water.

[0022] The quartz sand is composed of the following components in weight percentage, 50% of 6-12 mesh quartz sand, 38% of 20-40 mesh quartz sand, and 12% of 70-140 mesh quartz sand.

[0023] The manufacture method of special-purpose molding sand is identical with embodiment one.

Embodiment 3

[0025] A Φ1260×1200 special molding sand used for integral casting of cast steel back-up rolls, which is composed of the following components in weight percentage, 80% of quartz sand, 13% of clay, 1% of bentonite, and 6% of water.

[0026] The quartz sand is composed of the following components in weight percentage, 58% of 6-12 mesh quartz sand, 31.5% of 20-40 mesh quartz sand, and 10.5% of 70-140 mesh quartz sand.

[0027] The manufacture method of special-purpose molding sand is identical with embodiment one.

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Abstract

The invention discloses cold-type special molding sand for the integral casting of a large cast steel roller. The cold-type special molding sand is composed of the following compositions in parts by weight: 76% to 80% of quartz sand, 13% to 15% of clay, 1% to 2% of bentonite and the balance of water. When the special molding sand disclosed by the invention is used for the integral casting of a large cast steel roller having the diameter of Phi 900 to Phi 1400 and the amount of casting molten steel is 15 to 70 tons, the roller cold-type sanded thickness can be controlled within the range from 8mm to 9mm, thus improving the cold-type chilling capability of the roller body, enabling the columnar crystal thickness of the surface dense layer of the roller body to achieve about 150mm, reducing the chemical constitution aliquation of the outer layer, and enhancing the quality of the working layer of the roller body. The molding sand can prevent casting defects on roller surface excellently, such as sand adhesion and sand inclusion, results in smooth roller surface, improves the casting quality and the casting qualified rate of the large cast steel roller, and meets the demands on comprehensive application performances of the roller working layer of large section mills and strip mills, such as wear resistance, hot cracking resistance and accidence resistance.

Description

technical field [0001] The invention relates to a molding sand and a manufacturing method thereof, in particular to a special molding sand and a manufacturing method for the integral casting cold mold of a large cast steel roll. Background technique [0002] The molding technology of large integral cast steel rolls has generally gone through the following stages in recent decades. In the earliest production, two split sand boxes were mainly used, and dark cold iron was placed along the height of the roller body. Later, it evolved into an overall cold-type hanging sand, and the thickness of the cold-type hanging sand was controlled at 20-40mm. The thickness of cold molding sand will affect the thermal conductivity of molding sand and coating, and directly affect the solidification speed of molten steel after pouring. The radial temperature gradient and chemical composition segregation have a great influence on the thickness of columnar crystals in the dense layer on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/28B22C1/00B22C1/18
Inventor 付家双杨德明漆瑞鸿李元成
Owner 成都三强轧辊股份有限公司
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