SU1316741A1 - Sand for making moulds and cores - Google Patents

Abstract

The invention relates to foundry and can be used to make foundry molds and cores. The purpose of the invention is to improve the mixability. The goal is achieved by the joint addition of iron and sulfur oxides to the mixture. The mixture includes, wt.%: Liquid glass 2.5-6.5; iron oxides 0.1-2.0; sulfur 0.05-1.0; refractory filler on the basis of silicon dioxide - the rest. The joint introduction of iron and sulfur oxides into the composition of a liquid-glass mixture contributes to its strong softening after warming up to 800 ° C, which leads to an improvement in the knockability of the mixture from castings. 1 tab. i (L 00 and 4

Description

1 13167412

The invention relates to foundry. First, dry components are mixed and can be used for 2 minutes, and then introduced for the manufacture of casting molds and cores.

The purpose of the invention is to improve the yield. 5 The prepared mixture is compacted in the manner in which the mixture can be prepared using conventional methods. From received

The standard specimen is prepared for the casting mixture, and the molds and cores contain liquid glass, iron oxides, sulfur and refractory liquid glass and mix for another 4 minutes.

which are tested for durability, crumbling and knockability (by methanol filler. Liquid glass is used by JO-ZNIITMASH).

It is connected with (or a rolling module 2.15 and the curing of liquid-glass mixtures is performed by blowing COj, but can also be used

with a density of 1520 kg / m, (As a refractory filler, 1Q02B guard sand was used, iron oxide was used as technical iron oxide as iron oxide). The mixture is prepared by the runners.

drying,

The compositions of the mixtures and their physico-mechanical properties are given in the table.

93.75

2.50 0.10 0.05

1.15

O., 30 24

320

96.2595.5

3,005,0

0.501.0

0.250.5.

1,351.70

0.150.12 24 24

62

25

When mixed together with iron and sulfur oxides, the knockout operation of the mixture, as compared with mixtures containing quartz sand and liquid glass, decreases 84 and 110 times (mixtures 3 and 5),

Thus, the data in the table confirm the achievement of the supereffek. First, mix the dry components for 2 minutes, and then enter

water glass and stirred for another 4 min.

mixtures are prepared standard samples

that are tested for strength, shedding and knockability (by Meto Dryer,

The compositions of the mixtures and their physico-mechanical properties are given in the table.

92.65 92.0 91.0 90.5

1.68 0.06 24

1.90 2.25 0.02 0.02 24. 24,

22

nineteen

25

34

five

This is the nonadditive nature of the re- operation of the knockout of liquid-glass mixtures when used together as an odorizing agent for iron oxide and sulfur compared with the known variants of their individual use together with an aqueous solution of sodium silicate,

313

Additional introduction of sulfur into the liquid-glass mixture containing iron oxide does not impair the strength properties of the mixture and its technological properties.

The use of the invention permits the use of this mixture for the manufacture of molds and cores in the production of castings from iron, steel and other alloys.

The introduction of the invention will make it possible, compared with the prototype, which is taken as the basic object, to reduce the work of knocking out by a factor of 10, the consumption of fresh sand by about 80%, since the mixture that was destroyed during the knockout of forms can be reused to prepare the mixture.

Or M. Bandura 2382/9

Compiled by V.Shuvalov Tehred M.Hodanich

Cor Pod

Circulation 740 VNIISH State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, Projecto st., 4

6741

Formula

the invention

A mixture for the manufacture of casting molds and rods, including a refractory filler based on silicon dioxide, water glass and a softening agent, which in order to improve the embossability of the mixture, it contains as a softening agent. iron oxides and sulfur in the following ratio of ingredients, wt.%:

Liquid glass 2.5-6.5 Iron oxides 0.1-2.0 Sulfur. 0.05-1.0

Refractory filler based on silicon dioxide Else

Compiled by V.Shuvalov Tehred M.Hodanich

Circulation 740 of the USSR Military Committee

Claims (1)

Claim A mixture for the manufacture of foundry molds and cores, including a refractory filler based on silicon dioxide, liquid glass and a softening additive, characterized in that, in order to improve the knockability of the mixture, it contains iron and sulfur oxides as a softening additive in the following ratio of ingredients , md: Liquid glass 2.5-6.5 Iron oxides 0.1-2.0 fifteen Sulfur .0.05-1.0 Fireproof floor carrier based silica Rest