Anti-crack non-sticky precoated sand for forging

A kind of coated sand, not easy technology, applied in the field of coated sand, can solve the problems of not easy casting sand sticking, more pores in castings, difficult demoulding, etc.

Inactive Publication Date: 2016-12-07
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

[0005] Aiming at the problems existing in the background technology, the present invention proposes a crack-resistant and non-adhesive coated sand for casting, which has the characteristics of high temperature resistance, good density, and is not easy to stick to sand in castings, and solves the casting porosity that occurs in traditional coated sand molding Many, difficult demoulding defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, a kind of anti-cracking and non-sticky coated sand for casting, its raw materials include by weight: 80 parts of quartz sand, 50 parts of marble, 5 parts of talcum powder, 15 parts of pyrophyllite, 1 part of fly ash, gypsum 5 parts of powder, 5 parts of zircon powder, 5 parts of sodium fluorosilicate, 5 parts of magnesium oxide, 0.5 parts of trace elements, 2 parts of synergist, 10 parts of modified phenolic resin, 0.1 part of urotropine, 3 parts of water The synergist is modified starch, and its preparation method comprises: adding starch to 80wt% ethanol aqueous solution, adding caustic soda under stirring, basifying at 40°C for 20 minutes, adding boric acid, and stirring at 120°C for 30 minutes to obtain Described modified starch, wherein the weight proportion of starch, caustic soda, boric acid is 1:0.3:0.03;

[0020] Wherein, the method for preparing the modified phenolic resin includes: mixing 100 parts of phenol, 10 parts of papermaking black ...

Embodiment 2

[0022] In this embodiment, a kind of anti-cracking and non-sticky coated sand for foundry, its raw materials include by weight: 100 parts of quartz sand, 30 parts of marble, 15 parts of talcum powder, 5 parts of pyrophyllite, 10 parts of fly ash, gypsum 1 part of corundum powder, 15 parts of corundum powder, 1 part of sodium fluorosilicate, 10 parts of magnesium oxide, 0.1 part of trace elements, 8 parts of synergist, 2 parts of modified phenolic resin, 1 part of urotropine, and 1 part of water; The synergist is modified starch, and its preparation method comprises: adding starch to 90wt% ethanol aqueous solution, adding caustic soda under stirring, alkalizing at 30°C for 30 minutes, adding boric acid, and stirring at 50°C for 50 minutes to obtain the obtained Described modified starch, wherein the weight proportion of starch, caustic soda, boric acid is 1:0.1:0.05;

[0023] Wherein, the method for preparing the modified phenolic resin includes: mixing 100 parts of phenol, 20 ...

Embodiment 3

[0025] In this embodiment, a kind of anti-cracking and non-sticky coated sand for casting, its raw materials include by weight: 85 parts of quartz sand, 45 parts of marble, 8 parts of talcum powder, 12 parts of pyrophyllite, 3 parts of fly ash, gypsum 4 parts of powder, 8 parts of magnesia powder, 4 parts of sodium fluorosilicate, 7 parts of magnesium oxide, 0.4 parts of trace elements, 4 parts of synergist, 8 parts of modified phenolic resin, 0.3 parts of urotropine, 3 parts of water The synergist is modified starch, and its preparation method includes: adding starch to 85wt% ethanol aqueous solution, adding caustic soda under stirring, basifying at 35°C for 25min, then adding boric acid, and stirring at 80°C for 40min to obtain Described modified starch, wherein the weight proportion of starch, caustic soda, boric acid is 1:0.2:0.04;

[0026] Wherein, the method for preparing the modified phenolic resin includes: mixing 100 parts of phenol, 15 parts of sodium lignosulfonate ...

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PUM

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Abstract

The invention discloses anti-crack non-sticky precoated sand for forging. Raw materials of the anti-crack non-sticky precoated sand comprise quartz sand, marble, talcum powder, pyrophyllite, coal ash, gypsum powder, a refractory material, sodium fluosilicate, magnesium oxide, microelements, synergists, modified phenolic resin, urotropine and water. A preparation method of the modified phenolic resin comprises the steps that phenol, lignin and p-Toluene sulfonic acid are mixed and then reacted, formaldehyde and potassium hydrox are added, a viscous material is obtained through a reaction, dewatering, drying and crushing are conducted after washing, and the modified phenolic resin is obtained. The anti-crack non-sticky precoated sand for forging has the characteristics that high temperature resistance is achieved, the compactness is good, and the sand is not prone to adhering to a casting; and the defects that according to traditional precoated sand molding, the number of blow holes of a casting is large, and demolding is difficult are overcome.

Description

technical field [0001] The invention relates to the technical field of coated sand, in particular to a crack-resistant and non-adhesive coated sand for 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] Coated sand refers to the molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. In recent years, the production process of thermal coated sand has been widely used, that is, preheat the sand to a certain temperature, add resin to melt it, stir to coat the re...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/22
Inventor 吴延贵
Owner 蚌埠市北晨微型机床厂
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