SU865480A1 - Foundry core composition - Google Patents

Description

(54) MIXTURES FOR THE MANUFACTURE OF CASTING FOUNDATIONS The invention relates to foundry production, namely to the composition of mixtures on resin binders and the manufacture of rods for hot workpieces. The known mixture for the manufacture of molds and rods by hot box, including carbamide-furan resin, copper chloride and calcium stearate. However, this mixture has a small vitality, which leads to a shortened time of continuous operation of the core machine. Closest to the invention in terms of technical effect and effect achieved is a mixture for manufacturing casting rods f2, including a refractory filler, a carbamide-furan resin and a complex hardener containing wt.%: Sulfite-alcohol bard65-85 Orthophosphoric acid25-10 WATER 10-5 The disadvantages of the known mixture are not sufficiently high strength, vitality and fluidity of the mixture. RODS The goal is achieved that the mixture, including a refractory filler, carbdmide-furan and a complex catalyst, contains calcium stearate and monoethanolamine at the following ratio of ingredients,%: Urea 1.5–3.5 Calcium stearine – acid, 1.5–3.5 Calcium –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 2 Monoethanolamine 0.02-0.2 Complex catalyst 0, 3-1.0 Refractory filler Else With this complex catalyst the following composition, wt.%: Sulfite-alcohol bard 22-36 Orthophosphoric acid 10-3 Copper nitric acid 22-24 Urea42-36 WaterLeated The KF-40 resin, respectively, TU6-05-1785-76, is used as a carbamide-furan fiber, OB1KO2B sand as refractory fillers according to GOST 2138-74.

Calcium stearate is used respectively TU6-14-722-71, and monoethanolamine - MRTU 6-02-915-74.

KF-40 furan gum is a binding component, and the catalyst accelerates its curing and in combination with calcium stearic acid and monoethanolamine provides the necessary vitality and fluidity of the core mixture.

The mixture is prepared as follows.

First load refractory filler and. stirred for about 5 minutes, then calcium stearic acid was added and stirred for 1.0 minutes, then the catalyst, KF-40 resin and monoethanolamine with stirring after the introduction of each component for 2 minutes. The total mixing time of Tmery is 5 minutes.

Table 1 shows the compositions of the proposed. # 1x mixtures.

Table 2 shows the physicomechanical and technological properties of the mixtures.

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The invention allows:

a) increase the productivity of rod-type machines by reducing the time lost in the cleaning of bunkers and inflatable nozzles by an average of 25-30% compared with known mixtures

b) reduce the marriage of rods caused by the LOW fluidity and vitality of the mixtures on the non-vent rods

c) reduce the specific consumption of mixtures for the manufacture of rods by reducing the waste of the dried core mixture on the walls of the bunker and the nozzles of the machines by an average of 10-15%

comparing with known mixtures

d) facilitate the labor conditions of operators of pivotal machines.

I Table

Tensile strength

The tensile strength of the cold specimen, kg / cm

after 30 seconds of curing after 60 seconds of curing

22.5

22.1

30.1 25.8 24.8 30.3

Vitality, h

Claims (2)

Fluidity,% Formula 1, Mixture for the manufacture of casting cores, including a refractory filler, carbamide-FURANE, resin and a complex catalyst, is different because in order to increase strength, liveliness and fluidity, the mixture additionally contains calcium mono-ethanol and 1% the following ratio of ingredient, wt.%: Carbamide-furan acid 1.5-3.5 Calcium stearic acid 0.1-0.2 k) ethanethanolamine 0.02-0.2 Ksshplexny catalyst 0.3-1.0 Refractory at the Excess filler Continued table. 2 17 eleven 24 70 70 75 2. Mixture according to item 1, I differ in that the complex catalysts have the following composition,%: Sulfide-alcohol. va bard - 22-36 Orthophosphoric acid10-3 Copper nitrate 22-24 Urea42-36 Water Else Sources of information that are taken into account during the examination 1.Article of the USSR 83977, cl. B 22 C 1/10, 1975. 2. Authors certificate of the USSR 87777, cl. B 22 C 1/00, 1971.