SU1329881A1 - Composition of suspension for preparing the moulding sands - Google Patents

Abstract

The invention relates to foundry and can be used in single and mass production conditions. The chain of the invention improves the quality of the mixtures by reducing the tendency of the mixtures to form defects like chiminu, the uniform distribution of carbon-containing materials and the improvement of the antiburn properties of the mixtures, as well as the reduction of energy consumption. This goal is achieved due to the fact that the composition of the suspension additionally contains fireclay finely ground bentonite, coconut fine drink and high-grade flour in the following ratio of ingredients, May. %: bentonite 7–12, coal milled 2–5, solution of gossipol resin in kerosene (CKT-10) 0.8–1–1, chamotized toe shredded bentonite 2.5–5, coke coal fine dust 2.5–5, quartz flour 2.5-5, water the rest. The finely dispersed structure of fireclay bentonite, quartz flour and coke coal (1-3 µm dispersion) provides a high slurry stability of the suspension with a minimum preparation time, which reduces the power consumption during the preparation of mixtures. In addition, the uniform distribution of solid components the suspension allows the components to be evenly distributed during the preparation of the molding mixture and stabilize the properties of the latter during its operation. Quartz flour, evenly distributed around the grains of sand inside the clay-like membrane, increases the strength properties of the mixture with less consumption of bentonite in the suspension and, accordingly, a molding sand. The finely divided coke coal improves the antiburning properties of the mixture due to the rapid combustion of the metal during the pouring of the mold and the formation of a gas jacket at once. The high homogeneity of the distribution of the solid components of the slurry on the quartz sand grains of the molding sand makes it possible to partially compensate for its expansion during pouring, which leads to a decrease in thermal stresses in the mixture, respectively, the tendency of the mixtures to form defects like tehimine decreases (i.e., the scrapiness decreases). castings according to heat pipes). 3 tab. S (l

Description

one

The invention relates to foundry production, namely to the composition of molding sands, and can be used in conditions of both single and mass production of castings,

The purpose of the invention is to improve the quality of the mixtures by reducing the tendency of the mixtures to form defects such as scallops, the uniform distribution of carbon-containing materials and the increase in antiburning properties, as well as the reduction of energy consumption,

Coking coal dust is formed as a result of prolonged high-temperature impact on coal dust, as well as with joint grinding of coal and coal in a ball mill,

Fireclay bentonite - bentonite that has been baked at temperatures above 600 C.

Tonina grinding coking coal

ten

15

20

cue dust when pouring a gas jacket into a gas jacket for a second after pouring, the fluid penetration coherence into the pores of the mold is the most

High homogeneity of solid elements in the suspension of quartz sand grains is partially partially compensated for during pouring, which ensures thermal stresses and reduced scrap of castings.

The compositions of suspensions according to the table are presented in Table 2, the properties of suspension mixtures on their basis are presented in Table 3, the comparative reusable suspensions with the invention are used.

The economic effect of the proposed composition is suspended by reducing the slurry, by discarding castings

thirty

us and burn

and fireclay bentonite is provided with a formula that is invented by regulating the mode of drawing and deposition of ground materials during the pneumatic method of selecting them from the mills.

The finely dispersed structure of fireclay bentonite (1-3 µm), quartz flour (1-3 µm) and coke coal (1-3 µm) allows the suspension components to be kept in suspension with a minimum preparation time, increase the stability of the suspension during storage and reduce energy consumption in preparing the mixture.

The high homogeneity of the distribution of the components in the binder shell, deposited on the quartz base of the mixture, or the high dispersion of the solid elements in the composition of the aqueous coating makes it possible to obtain uniform distribution of the components during the preparation of the molding mixture and low water loss in the process of its use, i.e. the stability of the moisture content and the decrease in dryness, and consequently, the stability of the properties of the molding mixture during operation, which is usually achieved when starch is introduced into the molding mixture,

Entering into the composition of the suspension finely chopped coking coal pizvormula invented

The composition of the slurry for the foundry molding molding, smilling bentonite, coal, molten polystyrene resin in (CKT-10) and water, is different in that, in order to improve the quality of the mixtures due to the intelligence of the tendency of the mixtures to

25 distribution of carbonaceous materials and increase the opposite properties of mixtures, as well as energy consumption, contains chamotte

40 fine micronized bent fine carbon dispersed quartz flour, the dispersion of ryh is 1-3 microns, the opposite ratio of the ingredient

45

50

55

Bentonite ground coal A solution of gossypolovoy resin in kerosene

Fireclay bentonite with a dispersion of 1-3 microns Coking coal dust with a dispersion of 1-3 microns Quartz flour with a dispersion of 1-3 microns Water.

It helps to reduce the marriage of castings on the burner. This is due to very fast burning.

x

,

ten

15

20

cue dust during the pouring of the mold and the formation of a gas jacket already in the first seconds after pouring, when the probability of penetration of the molten metal into the pores of the mold is highest.

The high homogeneity of the distribution of solid elements of the suspension on quartz sand grains partially compensates for its expansion during pouring, which reduces the thermal stress of the mixture and reduces the waste of castings on waxes. .

The compositions of the suspensions according to the invention are presented in Table 1, Table 2, the properties of the suspension and molding mixtures based on them, and Table 3 shows the comparative results of using the suspension of the composition according to the invention.

The economic effect from the introduction of the proposed suspension composition is achieved by reducing the cost of the suspension;

formula invented

rmula of invention

The composition of the suspension for the preparation of foundry molding mixtures, including bentonite, ground coal, a solution of gossypolovoy resin in kerosene (SKT-10) and water, is different from the fact that, in order to improve the quality of the mixtures by reducing the tendency of the mixtures to form defects such as weeds, uniformities

the distribution of carbon-containing materials and increasing the antiburning properties of the mixtures, as well as reducing energy consumption, the composition additionally contains chamotised finely ground bentonite, coking fine dust and quartz flour, the dispersion of which is 1-3 µm, with the following ratio of ingredients, wt,%:

five

0

five

Bentonite ground coal A solution of gossypolovoy resin in kerosene

Fireclay bentonite with a dispersion of 1-3 microns Coking coal dust with a dispersion of 1-3 microns Quartz flour with a dispersion of 1-3 microns Water.

7-12 2-5

0.8-1

2.5-5

2.5-5

2.5-5. Rest

7.0 10.0 12.0

2, 0 3.55.0

-1, 0 1.01.0

2.5 3.5 5.0

2.5 3.5 5.0

2.5 3.5 5.0

Os-Os-0-znatalnaya

The magnitude of the thermal stresses of the molding

mixture (with its strength O) MPa), MPa 0.50 0.28

Sedimentation stability of the suspension

E static state (without mixing) h 1.0 3.0 10.0

Suspension viscosity according to VZ-1, с3 4 5

Moisture loss in unconsolidated sample

mixture when exposed to air for

1 h, Z11.5 11.0 10.6

The optimal content in the mixture of carbon materials, providing a sufficient anti-stick effect, Z4.0 .3.5 2.7

The content of active bentonite to ensure the strength of 0.1 Mlia, weight. % 4.2 4.0 3.7

The gas content of the molding mixture with the strength O, 1 Sha, obtained using the suspension, cm / g5.8 6.6 7.0

Table 1

table 2

 1329881

.Table 3

Indicators

Content of active bentonite in molding mixtures,%

Losses during ignition,%

Total clay-containing

%

The operation of the mixers in the feed tank suspensions during the work shift, h

Defective castings

prigara%

Defective castings

on snakes,%

The composition according to the invention

Claims (1)

²⁵ Formula of the invention The composition of the suspension for the preparation of foundry molding mixtures, including bentonite, ground coal, a solution of gossypol resin in kerosene 30 (SKT-10) and water, characterized in that, in order to improve the quality of the mixtures by reducing the tendency of the mixtures to form defects such as squeezes, uniform distribution of carbon-containing materials and increasing the non-stick properties of the mixtures, as well as reducing the energy consumption, the composition additionally contains chamotized 40 finely ground bentonite, coke coal fine dust and silica flour, the dispersion of which is 1-3 microns, in the following ratio of ingredients, wt.%; 45 Bentonite Coal, ground 7-12 2-5 fifty A solution of gossypol resin in kerosene Chamotized bentonite with a dispersion of 1-3 microns 0.8-1 2,5-5 55 1-3 microns quartz flour 2,5-5 dispersion 1-3 microns Water. 2.5-5. Rest