SU1224090A1 - Method of producing casting moulds and cores - Google Patents

Description

The invention relates to foundry, in particular to the manufacture of bricks and rods.

The purpose of the invention is to strengthen the production of water and to simplify the process of making molds and cores.

FIG. Figure 2-4 shows the process of making a mold; PA Fig, 576 rod manufacturing process.

Designations accepted: 1 filler, 2 - shell, 3 - perforated pipe, 4 - vacuum pipe, 5 - g-plate, b - model, / - flask, 8 - facing mixture, 9 - spigot, 10 and 11 - two parts core box,

The process of making molds and cores

Hei i is indicated as follows.

First, the filler 1 in shell 2 is molded and compacted to give. required confit uratspyu. Elastic or plastic materials, for example synthetic plastics, or deformable materials, for example rattus, are gas-impermeable paper or paperboard as the atrial shell. Formation of II compaction of a polystyrene in a shell made of synthetic pallets is carried out by limestone, similarly to the preparation of rods by vacuum molding, creating a rarefaction of (-200) - (- 600) mm Hg in the envelope through the vacuum pipe 4 and the perforated pipe 3. (-26.4. -79.4 kpa).

If as the material of the shell using plotpopo paper or cartoph ,. then a hole (not shown) is made in the shell, which is supposedly molded; for example, by gluing, through which a perforated tube is introduced into the shell cavity, and a feeder is fed, after which the shell is sealed and through the vacuum tube 4 and the perforated tube 3 is created her depression.

In the manufacture of the mold, the following axial operations are carried out.

The equipment consisting of a model PLATE; 5, models 6 and flasks 7 serve a facing, preferably, self-hardening mixture of cold (for example, with a mixture of resin binders) or hot

0

15

20

25

thirty

35

55

ten

45

50

1, for example, using ethyl silicate binders) for curing. The facing mixture is fed, and when it reaches a level 3 exceeding the model by 10–20 mm () 5, then, stopping the supply of the facing mixture, a compressed and filled into the casing is fed into the cavity of the tool (Fig. 3). In the case of applying a cold hardening facing mixture, before feeding the shell with the filler into the cavity of the snap in the shell, preferably from the side facing the model, holes are made (for example, punctured) to ensure the conditions for the removal of gases from the mold.

A filler in a shell, lined in a snap cavity, is placed on the surface of the facing mixture or partially (especially in the direction of the model, shell elements with a filler) are inserted into the facing mixture, at the same time filling the C7 spare volume of the equipment with facing mixture. At the same time, the casing with the contracting agent is completely in the volume of the facing mixture. Then the mold control is leveled, and after curing, the facing mold is removed from the model, the vacuum system is disconnected and the vacuum line 4 is disconnected from the perforated tube 3.

Molds made using cold hardening mixtures are fed to the assembly, and molds in which a mixture of hot hardening is used are heated. After burning out the solvent, the mold is calcined,

In this case, the shell material fade.

Forms made from mixtures of cold hardening, before metal is poured into them, they are again connected to the vacuum system and through the perforated pipe 3 and the holes (pricks) in the shell remove the gases formed when the metal is poured into the mold.

In the manufacture of the core, the shell 2 with the filler 1 is fixed in a snap-in during the assembly of the two halves 10 and 11 of the core box by means of a socket 9, which is connected to the perforated pipe 3 and the vacuum pipe 4. The free space between

the shell and the equipment are filled with an oblique mixture 8, and after it has been hardened, the evacuation system is disconnected, the equipment is disassembled, the rod (Fig.6) is removed and pipe 9 with pipe 4 is disconnected from the perforated pipe 3.

The operations of binder burnout and roasting of ceramic mixtures on the ethnosilicate binder are similar to those used to make molds.

To remove gases from the rod when the mold is cast with metal, it can be connected to the vacuum system through a perforated pipe 3.

The application of the proposed method allows to increase the productivity in the manufacture of two-layer forms by simplifying the process of filling the equipment with filler. It is applicable to the introduction into the cavity of a mold a filler from both bulk materials and plastic mixtures. Using this method in combination with cold-hardening or ceramic liquid-sliding facing mixtures allows reducing the costs of embossing and regeneration of mixtures, reducing the consumption of scarce materials for facing mixtures.

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Editor D, Bee

Compiled by A. Kolesnikov

Tehred I.POPOV1GCH Proofreader V, But ha

1869/12

Circulation 757 Subscription

BNIIPI USSR State Committee

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

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR PRODUCING CASTING FORMS AND RODS, including feeding pre-packed filler and facing mixture to technological equipment, characterized in that, in order to increase productivity and simplify the process, the filler is pre-compacted in a deformable shell, creating a vacuum in its cavity, and feed it in technological equipment together with the shell. 8a * mind>