Preparation method of molding sand for gray iron casting

A technology of molding sand and gray iron, which is used in casting molding equipment, molds, cores, etc., can solve the problems of poor mold release and large gas generation, and achieve the effect of improving mold release, small gas generation, and good air permeability.

Inactive Publication Date: 2012-03-07
辛培兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is found that the molding sand still has defects such as large gas generation and poor mold release, which cannot meet the increasing requirements for casting quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing molding sand for gray iron casting, comprising the steps of:

[0021] 1) Preparation of ingredients: weigh the following raw materials according to the weight of the ingredients prepared as required, 60% of modified starch, 2.5% of glycerin, 2% of sodium bicarbonate, 15% of iron oxide powder, 5% of straw powder, and the remaining The amount is water, add the above-mentioned weighed raw materials into the reactor, stir and mix, and heat to 85 ° C for 1 hour, then pour out the mixed materials in the reactor, dry or dry and process into Powder, that is, the prepared ingredients;

[0022] 2) Prepare molding sand: weigh the following raw materials in parts by weight according to the weight of the molding sand prepared as required, 93 parts of old sand, 4 parts of new sand, 0.3 part of bentonite, 6.5 parts of ingredients prepared in step 1), and 5 parts of water;

[0023] 3) Mixing molding sand: put the old sand, new sand and bentonite weighed in step ...

Embodiment 2

[0025] A method for preparing molding sand for gray iron casting, comprising the steps of:

[0026] 1) Preparation of ingredients: weigh the following raw materials according to the weight of the ingredients prepared as required, 70% of modified starch, 1.5% of glycerin, 5% of sodium bicarbonate, 10% of iron oxide powder, 8% of straw powder, and the remaining The amount is water, add the above-mentioned weighed raw materials into the reactor, stir and mix, and heat to 80 ° C for 2 hours, then pour out the mixed materials in the reactor, dry or dry and process into Powder, that is, the prepared ingredients;

[0027] 2) Prepare molding sand: weigh the following raw materials in parts by weight according to the weight of the molding sand prepared as required, 95 parts of old sand, 2 parts of new sand, 0.8 part of bentonite, 3.5 parts of ingredients prepared in step 1), and 8 parts of water;

[0028] 3) Mixing molding sand: put the old sand, new sand and bentonite weighed in step...

Embodiment 3

[0030] A method for preparing molding sand for gray iron casting, comprising the steps of:

[0031] 1) Preparation of ingredients: weigh the following raw materials according to the weight of the ingredients prepared as required, modified starch 65%, glycerin 2.0%, sodium bicarbonate 3.5%, iron oxide powder 12.5%, straw powder 6.5%, and the remaining The amount is water, add the above-mentioned weighed raw materials into the reactor, stir and mix, and heat to 83 ° C for 1.5 hours, then pour out the mixed materials in the reactor, dry or dry and process into Powder, that is, the prepared ingredients;

[0032] 2) Prepare molding sand: weigh the following raw materials in parts by weight according to the weight of the molding sand prepared as required, 94 parts of old sand, 3 parts of new sand, 0.5 part of bentonite, 5 parts of ingredients prepared in step 1), and 6.5 parts of water;

[0033] 3) Mixing molding sand: put the old sand, new sand and bentonite weighed in step 2) int...

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Abstract

The invention discloses a preparation method of molding sand for gray iron casting, comprising the following three steps: preparing raw materials, preparing the molding sand, and mixing the molding sand. The preparation method has the advantages of simple process steps, easy operation, no use of coal dust, clean workshop, little pollution, and low cost and environmental protection by using straw powder, modified starch and other renewable raw materials. The prepared molding sand has small gas content, short drying time, good permeability and high baked tensile strength in casting, and can improve the releasability of the sand mold, further improving the fineness of casts.

Description

technical field [0001] The invention relates to the field of casting, in particular to sand casting. Background technique [0002] Molding sand is a material used for molding in sand casting. Molding sand is generally mixed with molding materials such as foundry sand, sand binder and auxiliary materials in a certain proportion. Natural silica sand containing clay can also be used. The role of molding sand in the casting process is very important. The casting waste caused by the poor quality of molding sand accounts for more than 30% of the total casting waste. The usual requirements for molding sand are: good fluidity, certain plasticity, good air permeability and sand production. [0003] The Chinese patent publication number is CN101574725A, and the invention patent published on November 11, 2009 discloses a molding sand for casting aluminum and its preparation process. The molding sand for casting aluminum includes the following components: old sand, new sand, bentonite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 辛培兴
Owner 辛培兴
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