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Molding sand for casting gray iron

A technology of molding sand and gray iron, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of poor mold release and large gas generation, and achieve improved mold release, small gas generation, and short drying time. Effect

Inactive Publication Date: 2012-03-14
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

[0018] A molding sand for gray iron casting, the molding sand is composed of the following components in parts by weight, 93 parts of old sand, 4 parts of new sand, 0.3 part of bentonite, 6.5 parts of ingredients, and 5 parts of water, wherein the preparation method of the ingredients is Weigh the following raw materials by weight percentage, 70% of modified starch, 1.5% of glycerin, 5% of sodium bicarbonate, 10% of iron oxide powder, 8% of straw powder, and the balance is water. Stir and mix in the reactor, and heat to 80° C. for 2 hours, then pour out the mixed material in the reactor, dry or dry it and process it into powder to prepare the ingredient.

Embodiment 2

[0020] A molding sand for gray iron casting, the molding sand is composed of the following components in parts by weight: 95 parts of old sand, 2 parts of new sand, 0.8 part of bentonite, 3.5 parts of ingredients, and 8 parts of water, wherein the preparation method of the ingredients is Weigh the following raw materials by weight percentage, modified starch 60%, glycerin 2.5%, sodium bicarbonate 2%, iron oxide powder 15%, straw powder 5%, the balance is water, add the raw materials weighed above Stir and mix in the reaction kettle, and heat to 85° C. for 1 hour, then pour out the mixed material in the reaction kettle, dry or dry it and process it into powder to prepare the ingredient.

Embodiment 3

[0022] A kind of molding sand for gray iron casting, the molding sand is composed of the following components in parts by weight, 94 parts of old sand, 3 parts of new sand, 0.5 part of bentonite, 5 parts of ingredients, 6.5 parts of water, wherein the preparation method of the ingredients is Weigh the following raw materials by weight percentage, modified starch 65%, glycerin 2.0%, sodium bicarbonate 3.5%, iron oxide powder 12.5%, straw powder 6.5%, the balance is water, add the raw materials weighed above Stir and mix in the reactor, and heat to 83° C. for 1.5 hours, then pour out the mixed material in the reactor, air dry or dry it and process it into powder to prepare the ingredients.

[0023] The mixing method of the molding sand in Examples 1 to 3 is as follows: put the old sand, new sand and bentonite into the sand mixer, add 70% water, mix for 35 minutes, then add the ingredients and the remaining water, and mix for another 35 minutes That's it.

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Abstract

The invention discloses molding sand for casting gray iron, and the molding sand comprises the following components in parts by weight: 93-95 parts of old sand, 2-4 parts of new sand, 0.3-0.8 part of bentonite, 3.6-6.5 parts of auxiliaries and 5-8 parts of water, wherein the preparation method of the auxiliaries comprises the following steps: weighing the following raw materials by weight percent: 60-70% of modified starch, 1.5-2.5% of glycerin, 2-5% of sodium bicarbonate, 10-15% of ferric oxide powder, 5-8% of straw powder and the balance of the water, adding the well weighed raw materials into a reaction kettle, stirring, mixing, heating to 80-85 DEG C, continuing for 1-2 hours, then pouring out the mixed materials in the reaction kettle, air-drying or drying and processing into powder so as to prepare the auxiliaries.

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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