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Mould sand

A technology of molding sand and coated sand, which is applied in the direction of casting molds, cores, casting molding equipment, etc., can solve the problems of high cost, deformation of sand cores, etc., achieve high production efficiency, prevent particle size from being too fine, and improve air permeability.

Inactive Publication Date: 2009-07-01
西峡县内燃机进排气管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually when new sand is added, it is not roasted, because the cost is too high, and the original sand used in the prior art does not undergo phase change, in the process of preparing molding sand, the high temperature is easy to deform the sand core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The molding sand of this example is composed of the following components in weight percentage: 0.6% bentonite, 0.5% coal powder, 4.5% water, and the rest is collapsed coated sand.

[0018] The mixing process realizes online detection. Wherein bentonite refers to sodium bentonite.

[0019] Among them, the normal temperature tensile strength of the film-coated sand core is 4.0-4.5Mpa, the gas output is ≤14ml / g, and the 50-100 mesh is ≥75%.

[0020] The molding sand of this embodiment: wet compressive strength ≥ 0.1Mpa, air permeability ≥ 70, water content 3.5-4.5, compaction rate 40-50, mud content 16-18%.

[0021] The performance index of bentonite in the present embodiment is as follows:

[0022] Item Internal control quality indicators

[0023] Product grade PNa-12-35 PNa-11-35

[0024] Wet compressive strength (Kpa) ≥125 ≥115

[0025] Hot wet tensile strength (Kpa) ≥3.5 ≥3.5

[0026] Blue absorption (g / 200g) ≥38 ≥35

[0027] Swelling value (ml / 3g) ≥90 ≥90

[0...

Embodiment 2

[0040] The molding sand of this embodiment is composed of the following components in weight percentage: 0.7% bentonite, 1.0% coal powder, 3.5% water, and the rest is collapsed coated sand.

Embodiment 3

[0042] The molding sand of this embodiment is composed of the following components in weight percentage: 0.8% bentonite, 0.9% coal powder, 4.0% water, and the rest is collapsed coated sand.

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Abstract

The invention relates to a moulding sand, which consists of the following component by weight percentage: 0.6 to 0.8 percent of bentonite, 0.4 to 1.0 percent of coal dust, 3.5 to 4.5 percent of water, and the balance being dispersed coated sand. The moulding sand does not add new sand into the moulding sand, and the new sand is replaced by the dispersed coated sand, so as to not only guarantee the quality of products, but also greatly reduce the production cost. The dispersed coated sand can be reused, so as to save the energy and reduce the environmental pollution, the pumped dust can be used for preparing protective materials, and the waste sand can be used for producing bricks. The moulding sand fully utilizes waste and realizes harmless casting treatment.

Description

technical field [0001] The present invention relates to a molding sand. Background technique [0002] Molding sand is generally made of molding materials such as new sand, old sand, molding sand binder and auxiliary additives mixed in a certain proportion, and natural silica sand containing clay can also be used. The role of molding sand in foundry production is extremely important, and casting waste products caused by poor quality of molding sand account for about 30-50% of the total casting waste products. The usual requirements for molding sand are: (1) High strength and thermal stability to withstand various external forces and high temperatures. (2) Good fluidity, that is, the ability of molding sand to move between sand particles under the action of external force or its own gravity. (3) Certain plasticity, that is, the ability of molding sand to deform under the action of external force and maintain the given shape when the external force is removed. (4) Good air p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 赵新武程景胜乔永涛李立新
Owner 西峡县内燃机进排气管有限责任公司
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