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High-temperature-resistant casting molding sand

A high-temperature-resistant, molding-sand technology, applied in casting molding equipment, casting molds, cores, etc., can solve problems such as the difficulty of crushing and cleaning molding sand, and achieve the effects of being beneficial to smoothness, improving thermal conductivity, and improving refractoriness

Inactive Publication Date: 2017-01-04
蚌埠市北晨微型机床厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the casting process of some metals with high temperature, due to the high temperature, such as stainless steel, the casting can only be realized when the temperature is above 1000°C. Special sand such as zircon sand, chromite sand, corundum sand, etc. The degree of hardening of the molding sand is also relatively high, such as forming ceramics, so for some special-shaped stainless steel products, the crushing and cleaning of the molding sand is a more difficult problem in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, a molding sand for high temperature resistant casting, its raw materials include by weight: 150 parts of quartz sand, 20 parts of ceramic microspheres, 5 parts of pyrophyllite, 15 parts of attapulgite, 10 parts of talc powder, 30 parts of zircon powder 2 parts of magnesia, 15 parts of silicon micropowder, 5 parts of gypsum whiskers, 10 parts of sodium rosinate, 5 parts of sodium metasilicate, 6 parts of starch, 3 parts of cellulose gum, 3 parts of chlorinated paraffin, synergist 5 parts, 120 parts of water; the starch is modified starch, and its preparation process includes: adding starch to 80wt% ethanol aqueous solution, adding caustic soda under stirring, basifying at 40°C for 20 minutes, then adding boric acid, and then adding boric acid at 120°C Stir for 30min to obtain the modified starch, wherein the weight ratio of starch, caustic soda, and boric acid is 1:0.1:0.05;

[0020] Wherein, the synergist includes by weight: 15 parts of titanium diox...

Embodiment 2

[0022] In this embodiment, a molding sand for high temperature resistant casting, its raw materials include by weight: 200 parts of quartz sand, 10 parts of ceramic microspheres, 15 parts of pyrophyllite, 5 parts of attapulgite, 20 parts of talc powder, and 15 parts of corundum powder , 5 parts of magnesium oxide, 5 parts of silicon powder, 10 parts of gypsum whiskers, 5 parts of sodium rosinate, 10 parts of sodium metasilicate, 2 parts of starch, 5 parts of cellulose gum, 1 part of chlorinated paraffin, 15 parts of synergist parts, 30 parts of water; the starch is modified starch, and its preparation process includes: adding starch to 90wt% ethanol aqueous solution, adding caustic soda under stirring, alkalizing at 30°C for 30min, adding boric acid, and stirring at 50°C 50min, obtain described modified starch, wherein the weight proportion of starch, caustic soda, boric acid is 1:0.3:0.03;

[0023] Wherein, the synergist includes by weight: 25 parts of titanium dioxide, 10 pa...

Embodiment 3

[0025] In this embodiment, a molding sand for high temperature resistant casting, its raw materials include by weight: 170 parts of quartz sand, 16 parts of ceramic microspheres, 8 parts of pyrophyllite, 12 parts of talcum powder, 3 parts of attapulgite, 25 parts of magnesia powder 3 parts of magnesium oxide, 12 parts of silicon powder, 7 parts of gypsum whiskers, 8 parts of sodium rosinate, 7 parts of sodium metasilicate, 5 parts of starch, 3 parts of cellulose gum, 3 parts of chlorinated paraffin, synergist 8 parts, 90 parts of water; the starch is modified starch, and its preparation process includes: adding starch to 85wt% ethanol aqueous solution, adding caustic soda under stirring, alkalization reaction at 35°C for 25min, then adding boric acid, and adding boric acid at 85°C Stir for 40min to obtain the modified starch, wherein the weight ratio of starch, caustic soda and boric acid is 1:0.2:0.04;

[0026] Wherein, the synergist includes by weight: 20 parts of titanium d...

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Abstract

The invention discloses high-temperature-resistant casting molding sand which comprises the following raw materials in parts by weight: 150-200 parts of quartz sand, 10-20 parts of ceramic microspheres, 5-15 parts of pyrophyllite, 5-15 parts of attapulgite, 10-20 parts of talcum powder, 15-30 parts of a refractory material, 2-5 parts of magnesium oxide, 5-15 parts of silica powder, 5-10 parts of gypsum crystal whisker, 5-10 parts of sodium abietate, 5-10 parts of sodium metasilicate, 2-6 parts of starch, 3-5 parts of cellulose gum, 1-3 parts of chlorinated paraffin, 5-15 parts of a synergist and 30-120 parts of water, wherein the synergist comprises 15-25 parts of titanium dioxide, 10-16 parts of modified coal ash and 3-5 parts of sodium hexametaphosphate. The high-temperature-resistant casting molding sand disclosed by the invention not only has the advantages of being good in high temperature resistance and easy to crush and clean, but also has the advantages of being good in strength, good in breathability and rapid to bake, calcine and cure.

Description

technical field [0001] The invention relates to the technical field of molding sand, in particular to a molding sand for high temperature resistant casting. Background technique [0002] Casting is the process of smelting metal into a liquid that meets certain requirements and pouring it into a mold, cooling, solidifying, and cleaning to obtain a casting with a predetermined shape, size, and performance. Because the casting blank is almost formed, the purpose of free machining or a small amount of machining reduces the cost and reduces the time to a certain extent. Casting is one of the basic processes of modern machinery manufacturing industry. [0003] Molding sand is a material used for molding in casting. The molding sand used in casting is mostly made of raw sand (mountain sand or river sand), clay and water mixed in a certain proportion, of which clay is about 9%, water is about 6%, and the rest is raw sand. Sometimes a small amount of additives such as coal powder,...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B22C1/16
CPCB22C1/00B22C1/02B22C1/167
Inventor 吴延贵
Owner 蚌埠市北晨微型机床厂
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