RU1799658C - Clad mixture for manufacture of casting molds and cores - Google Patents

Abstract

Application: sand-resin per mixture is intended for the manufacture of foundry cores and molds in heated tooling. Essence: by replacing calcium stearate with the preservative IVB-S-706M, which is introduced into the mixture in the form of a general solution with urotropin, an increase in the hot strength of the core and molding mixtures is achieved. The use of the proposed clad mixture makes it possible to expand the application of the technological process for the manufacture of foundry cores and molds for heated accessories. 2 tab.

Description

The invention relates to foundry, in particular to compositions of clad mixtures for the manufacture of foundry molds and cores.

The purpose of the invention is to expand the technological capabilities of the manufacture of rods and molds. This effect is achieved due to the use of preservative IVV-S-706M in the composition of the hot-clad mixture. enriched with ethylene glycol, in the form of a water-wax dispersion. The introduction of a preservative in the form of a general solution with urotropine into the mixture allows the cladding process to be carried out without increasing the cycle time.

The invention is as follows.

In the proposed composition of hot-clad mixes, the preservative IVV-C706M in the form of a visible-wax dispersion is used as a release agent. Due to the significant content of ethylene glycol (up to 8.1 wt.%), The preservative is a frost-resistant additive, which allows expanding the possibility of using mixtures in a wide temperature range. Advantageously, the preservative is introduced into the mixture in the form of a general solution with urotropine, which allows the cladding process to be carried out without increasing the cycle time. At the same time, its uniform distribution over the grains of the refractory filler and is achieved. as a result, the fluidity and compressibility of the mixture are higher, and therefore, the strength and speed of curing are higher. This makes it possible to produce larger molds and rods and increase equipment productivity, i.e. expand technological capabilities

PRI me R. As a comparison, dry clad sand

with

V4 U H) ON SL 00

resins per mixture of the following composition, wt.%:

Sand quartz 062K016B 94.41

Binder - novolac phenolformaldehyde resin, grade SF-015 4.0

Urotropin (33% aqueous solution)

1.44

Calcium stearate 0.15

Mixtures were prepared at the plants of the mountains of which sand cladding was mod. Maksey-250. In the proposed mixture, the amount of preservative IVV-S-706M was 0.05-0.11%. Samples - eights from the prepared compositions were cured in a laboratory installation of mods. 4735A at 240 ° C for 2 minutes .

The composition and properties of the mixtures are given in table 1 and 2.

It can be seen from Tables 1 and 2 that the content of the preservative in the amount of 0.06-0.1% positively affects the curing rate (assessment of strength in hot condition) and strength. When the preservative content is less than 0.06%, the mixture is lumpy during storage, and above 0.1% there is no increase in curing speed and strength.

0

5

0

5

The implementation of the invention will expand the possibility of using clad mixtures in the foundry industry.

Claims (1)

The claims Clad mixture for the manufacture of foundry molds and cores, including a refractory filler, novolac phenol-formaldehyde resin, an aqueous solution of urotropine and a dividing additive in the form of a water-wax dispersion, so that, in order to expand technological capabilities, it contains a water-wax dispersion enriched with ethylene glycol, a preservative IVV-S-706M, in the following ratio of ingredients, wt.%: Novolac Phenol Formaldehyde Resin 3-6 Aqueous solution of urotropine 1,08-2,16 Water-wax dispersion enriched with ethylene glycol, preservative IVV-S-706M 0.06-0.1 Refractory filler. The remaining content of ethylene glycol in the IVV-S-706M preservative is 1.3-8.1% by weight of the preservative. Table 1