SU707032A1 - Sand for making casting molds and cores - Google Patents

Abstract

MIXTURE FOR THE MANUFACTURE OF CASTING FORMS AND RODS, including a refractory filler, water-soluble wood thermolysis resin 1 or water-soluble organic saccharide-containing fasteners. on the basis of waste in the processing of growing raw materials, alkaline earth metal oxide, that is, in order to reduce the duration of solidification and increase the strength of the forms and cores at all stages, the mixture additionally contains carbonate alkaline earth metal in the following ratio of ingredients, wt.%:: Water-soluble resins, thermolizated wood, or water-soluble organic • ca-.aris; Supporting the cores of waste based on processing and reprocessing raw materials 1.0–20.0 Alkaline earth oxide go metal 0.5-10.0 Alkaline-earth metal carbonate '0.5-10.0 Refractory filler Else i (L * s | o ^: ^ N0

Description

The invention relates to the manufacture of casting molds and cores. . - - A known self-hardening mixture for the manufacture of casting molds and cores on the basis of products, sludge processing pitch and complex curing and grinding and iMagnesite and mineral rich. Woody pitch in the crust: now yrem is an extremely scarce product. In turn, resin, its content (resin is sedimentary, W6n 30 is resin of hardwood, OOT 81-55 is not aerated, they have an increased viscosity, which is essentially difficult to use in the foundry. ..: ....:. : ... ...,: ... ;; The closest in technical essence and the achieved result WnSefC) ush: string rods / including sugar binder as a binding agent, or resin or fiber resins tf gblrjHta wood, OXY; shitter The latter does not provide the required CKdiJOCTH cure, and the strength of the molds and cores in the process requires, for reproduc tion: ds5 soluble resins of thermolysis of areyoesgyy or water-soluble organic saccharide-containing fixtures based on wastes in the processing of vegetable raw materials. The 3fa problem is achieved by the fact that, as hardening of the mentioned mixtures, the mixture contains in addition the carbonite of the green metal with the following ratio of ingredients, wt.%: TO bracestral resins of thermal sulphate or 1; ,,:,.: organic soluble,,.,:. : ,, ,,.,,,., saccharide-containing. shishyo | feypeli. - based on rthodov. when processing the plant: / nssego raw materials 1,0-20,0 okieel gap 1-land metal0, 5-10,0 Carbonate alkaline earth metal; . tal0,5-10,0 Refractory filler Else Production in foodstuffs and temipimojirahsha woodsWe have been established on a commercial scale at the plant chemical industry. The following marketable products are available: COO s oxane, KVS-2, amzit, phenoxin, resin SDHO S vskogo LHZ, etc. Products that include a significant amount of water-soluble saccharides from a range of monosaccharides, sugar-like polysaccharides and water soluble polysaccharides. A significant amount of monosaccharides (such as fructose, glucose, etc.) is contained in the waste in the production of juices, wines, grape and fruit sugars. High content of sugar-like polysaccharides (sucrose, low toxicity, raffinose, etc.). There is in such wastes from the production of sugar from beets and cane, such as small cCa, hydrol, syrup, etc. Water-soluble polysaccharides (starch, pectinaceous substances) are accumulated in bstroms during the production of starch, fruit juices. Oxides of alkaline earth metals can be represented by such industrial materials as caustic magnesite, lime slaked and yeashena, calcined dolomite. The main source of carbonates of alkaline-earth materials are different grades of chalk, limestone, dolomite, and agnesite caustic; BASIC; The use of a complex hardening additive from oxides and carbonates of alkaline earth metals in the composition of the mixture makes it possible to significantly increase the intensity of hardening. The preparation of mixtures is carried out in batch mixers of batch and continuous action. - J In order to reduce the content of the hardener, products containing metal oxides and carbonates should be used in powdered state with a specific surface area of PSP-4 more than 1200. In turn, it is recommended to inject the binder, in order to increase the fluidity of the mixture, to INPUT in the form of a solution with a viscosity according to a VZ-4 viscometer for up to 240 s. The compositions of the mixtures and their physico-mechanical and technological properties are given in Table. 1 and 2. Mixtures 1-3 are taken as a prototype. . Mixtures of compositions 5, 8 and 10–12 are intended for the manufacture of bulk rods of 3-5 grades of complexity. Compositions 4, 7c with the lower limit content of binding components can be used mainly for the manufacture of molds with a wall thickness of at least 150 mm. For example, the strength of the mixture through

10, 30 min. Delivery in air, db, stygaea, respectively (see Table 2) 0.7-1.2; 5-9 kg / cm in compression that. allows to take out the rods in 8-10 minutes from the boxes, and in 30-40 minutes to transport them. With sTONf, the final strength of the mixture is 30-37 kg / cm in compression. Thus, the mixtures according to the invention, unlike mixtures of ± and 2J, can be used in workshops with a cycle of manufacturing rods for up to 8-10 minutes.

Mixes b, 9c with the upper limit of the content of components will be used for the production of thin-walled forms, ceramic coatings, and chill molds. The addition of a surfactant to the mixtures allows the mixtures to be used in liquid-mobile

condition. In this case, the core molding is poured into the core drawers of the mixture. The mixtures of the invention can be heat cured. With

Thereby, the rate of heat curing of mixtures with the proposed hardener is 2-3 times higher than without the addition of

hardener. For example, mixtures 10–13 at 150–200 ° C are cured for 15–20 minutes, and these mixtures without carbonates and oxides of alkaline earth metals harden in the same conditions for only 30–60 minutes.

Making cores

and forms of mixtures according to the invention.

will speed up the cycle of their manufacture, improve the quality of the casting and save the rods bout. As a result, the cost per ton will be reduced.

pour 2-3 rubles.

Table 1

Quartz sand, 1K02A92 95 94 98 91 60 98 5

- - 3

3 2

f

1.0.5210

- 10, 5210

th - a

4.-.; - J

- 60 91 9-1 91 93

91

20

20 - - -5

- - 5-- 5 -10 222

2 2

10,222

3

0,2-0,25 0,3-0,40,2-0,3

0.9.-1.00.6-0.7

2-3 2-2,51 / 3-1,4

3-4

20-25 25-28 6-7

26-30

150-200 160-1 0250-170

150-200

0.4-0.6 0.2-o, 40.3-0.4 0.5-0.6

0.8-0.9 3-40.2-0.3

3-3.2 9-100,7-0,8

5-6 15-161.2-1.3.

7-8.2-2,5

9-12 20-252,1-2,4

30-35 80-906-7

160-170-50-70250-260 0.1-0.2 0.08-0.1 0.3-0.5

Continued table. 2

Claims (1)

MIXTURE FOR THE PRODUCTION OF CASTING FORMS II BARS, including refractory filler, water-soluble wood thermolysis resins or water-soluble organic saccharide-based fasteners based on waste from the processing of plant materials, alkaline earth metal oxide, not tearing so that, in order to reduce the duration of hardening and increase the strength of molds and cores at all stages of hardening,. the mixture additionally contains alkaline earth metal carbonate in the following ratio of ingredients, wt.%: Water-soluble wood thermolysis resins or water-soluble organic Alkaline earth carbonate Refractory filler 1,0-20,0 0.5-10.0 0.5-10.0 Rest SU „„ 707032 f