SU839649A1 - Sand for producing casting cores in hot boxes - Google Patents

Description

(54) SMNS FOR THE MANUFACTURE OF THE CASTING STREETS OF THE KRYNEI IN THE HOT BOXES

Refractory

1po: 1nitelEmost

In tab. 1 shows the compositions of the proposed mixtures.

The components are introduced into the runners in the above order.

Samples are prepared from the mixtures by curing on a 4735 instrument at 220 ° C.

Test samples for rupture carried out on the instrument mod. 083 Usmansky plant. In the mixture, an AO / o-th aqueous solution of aluminum chloride in the form of aluminum chloride according to TU-BU-X-101-68, chlorine chromium according to GOST 4473-64 in the form of a 10% aqueous solution in resin KF-90 according to TU-6 -05-1310-71.

In tab. 2 shows the properties of the proposed mixtures.

To determine the optimal content of chlorine chromium in the mixture, the compositions are prepared, including, by weight. %: carbaIngredients

mid-furan resin KF-90 - 2.5, aluminum chloride 0.015, refractory filler, the rest, differing from each other in chlorine chromium content, which is equal in each mixture, weight / about:

0.01; 0.02; 0.03; 0.04.

The dependence of the basic physicomechanical properties on the amount of the additive is given in Table. 3

As follows from the table. 3, the optimal addition of chlorine chromium is in the range of 0.2-0.3 weight. % As its amount decreases or increases, the properties change only slightly.

As follows from the table. 1 and 2, chlorine-chromium blend blends have higher fluidity, vitality and strength and cure rate.

Higher fluidity and survivability of the mixture allow it to be stored longer, and higher strength — reduce binder consumption, which improves working conditions.

Table 1

Mixture, wt.%

Sand 1K02A Aluminum chloride Chlorine chrome

Physicomechanical and technological properties

The tensile strength of the samples cured at

a) in a hot condition after exposure in a heated box in te10.

thirty

60

97,265

97 ,. 265 0.015 0.02

table 2

Mixtures 1 2

1.0 1.2 1.5

Prev Table 2 Formulas of the Invention A mixture for the manufacture of casting cores in hot boxes, including a refractory filler, carbamide-furan resin, a metal chloride salt and water, which, in order to improve the strength and speed of curing, the mixture additionally contains aluminum chloride, and as the chlorine salt of the metal is chlorine chromium in the following ratio of ingredients, weight. / o: Carbamide-furan resin 2.0-3.0 8 Aluminum chloride 0.01-0.02 Chlorine chromium 0.02-0.03 Water-0.1-0.4 Refractory fillerOther Resource Sources taken into account during the examination 1. USSR author's certificate 387777, cl. In 22 C 1/00, 1970. 2. The author's certificate of the USSR 710742, cl. In 22 C L / 00, 1977. 3. The author's certificate of the USSR 590888, cl. B 22 C 1/10, 1975.

Claims (1)

Claim A mixture for the manufacture of foundry cores in hot boxes, including a refractory filler, urea-furan resin, a metal chloride salt and water, characterized in + capacity, which, in order to increase the strength and speed of curing, the mixture additionally contains aluminum chloride, and as chlorine salt metal - chlorine chromium in the following ratio of ingredients, weight. %: Urea-furan resin 2.0-3.0 Aluminum chloride Chlorine Chrome Water Refractory filler 0.01-0.02 0.02-0.03 0.1-0.4 Else