RU2292983C2 - Evacuated plate for making vacuum-film casting molds - Google Patents

Abstract

FIELD: foundry, namely fittings for making vacuum-film casting molds.

SUBSTANCE: under-pattern plate includes body whose inner cavity is divided by means of fluid-tight walls by separate cavities. Each cavity through separate unions and shut-off valves communicates with common manifold that through common shut-off valve is connected with evacuating system. In center of each small side of fluid-tight walls of inner cavities lugs-bosses are formed; said lugs-bosses are provided with sleeves.

EFFECT: enlarged operational possibilities of vacuum-film molding machine.

1 dwg

Description

The invention relates to foundry, and in particular to equipment for the manufacture of vacuum-film foundry molds.

Known model plate for vacuum-film molding (Minaev A.A., Notkin E.B., Sazonov V.A. "Vacuum molding", M .: Engineering, 1984, p.5), containing a housing with a closed cavity , fitting for connecting the cavity to a vacuum system. The working surface of the model plate is connected to the cavity of the model plate through holes with a diameter of 0.5-1 mm.

The disadvantage of the described model plate is that its overall dimensions in plan are limited by the dimensions of the molding table of the molding machine and the center distance between the centering and guide pins, which does not allow the use of other types of flasks on a particular molding machine in case of a change in the casting range.

Known model plate for vacuum-film molding (ed. St. USSR No. 680803), containing a housing with a cavity and a fitting for connecting to a vacuum system. To increase the versatility of the model plate, it is equipped with a removable perforated sheet mounted on the working surface of the housing, while the perforated sheet, which acts as a model plate, has coordinate holes. Such a model plate is closest to the proposed invention and adopted as a prototype.

The disadvantages of the prototype include the fact that the overall dimensions of the model plate in the plan are tied to the dimensions of the molding table of the molding machine and the center distance between the centering and guide pins (or centering and guide bushings), which does not allow the use of flasks of other sizes in case of a change in the range of castings, narrowing thereby the scope of the molding vacuum film machine.

The present invention solves the problem of expanding the possibilities of manufacturing vacuum-film casting molds in flasks of any standard size on one molding machine.

The technical result is achieved by the fact that in a submodel evacuated plate for the manufacture of vacuum-film casting molds containing a body with a cavity connected to a vacuum system, a replaceable perforated model plate, the body cavity is divided by sealed walls into separate cavities, each of which is connected by separate fittings through shut-off valves with a common manifold connected through a common shut-off valve with a vacuum system, a sleeve for a centering piece is located in the center of the common housing wall In the middle of each opposite sealed wall of the internal cavities, bosses with bushings for guide pins are made, while a replaceable perforated model plate, depending on its size, is mounted on the corresponding pins.

New in the claimed technical solution is that in a model vacuum pump for making vacuum-film casting molds, the body cavity is divided by sealed walls into separate cavities, each of which is connected by individual fittings through shut-off valves to a common manifold connected through a common shut-off valve to a vacuum system , in the center of the common wall of the housing there is a sleeve for the centering pin, and in the center of each opposite sealed wall of the internal cavities there are tides lugs with bushings for guide pins, while a replaceable perforated model plate, depending on its size, is mounted on the corresponding pins.

When changing the nomenclature of castings and the size of the flask, a corresponding model plate is installed on the pins on the model plate, which covers the corresponding cavities in the model plate with its perforated plane. At the same time, to evacuate the corresponding cavity, the corresponding shut-off valve is turned on, through which this cavity is connected by means of a fitting to the common collector.

The invention is illustrated by the drawing, which shows a model vacuum pump for the manufacture of vacuum-film foundry molds.

The model vacuum plate for the manufacture of vacuum-film casting molds comprises a housing 1, the cavity of which is divided by sealed walls 2 into separate cavities 3, 4, 5, 6, 7, the dimensions of which in plan correspond to the sizes of the corresponding model plates 8. In the center of the common wall 9 of the housing 1 there is a sleeve for the centering pin 10, and in the center of each opposite sealed wall of the internal cavities there are boss tides 11 into which the sleeves 12 for the guide pins 13 are inserted. Through holes in the common wall 9 of the housing 1 of the submodel plate, fittings 14 are inserted, connecting each of the cavities 4, 5, 6, 7 with the corresponding shutoff valves 15, which through their fittings 16 connect all the cavities of the submodel plate to a common manifold 17. The collector 17 through the shutoff valve 18 connects the submodel plate to vacuum system. The housing 1 of the model plate is attached to the table of the molding machine using mounting plates 19.

Model vacuum plate for the manufacture of vacuum-film casting molds works as follows. On the molding table of the vacuum-film machine, a submodel evacuated plate is installed, which is attached to the table of the machine with the help of plates 19. Depending on the size of the flask in which the vacuum-film form is made, the corresponding model plate is installed on the case 1 of the submodel plate using pins 10 and 13 8 with models (not shown). From the corresponding cavities closed by the model plate with a vacuum system through a common shut-off valve 18, a common manifold 17, corresponding shut-off valves 15 and fittings 14, 16, air is pumped out (a vacuum is created in the respective cavities) for covering the models with polymer film according to the technology conventional for vacuum-film molding. Then, a flask is installed on the model plate, in which a vacuum-film form will be made.

In the case of a change in the nomenclature of castings and a change in the dimensions of the flask, for example, in the direction of reduction, a model plate of smaller sizes, but corresponding to the dimensions of the flask, is installed on the model plate. In this case, for example, the cavities 3, 4, 5 are overlapped with the model plate. Then, to tighten the new model plate with the models, it is necessary to create a vacuum in the cavities 3, 4, 5 by means of a vacuum system through the corresponding fittings 14, shut-off valves 15, fittings 16, manifold 17 and a common shut-off valve 18. Then, a flask is installed on the model plate, in which a vacuum-film mold will be made. While the cavity 6, 7 remain unused, and the corresponding shut-off valves 15 are normally closed.

Thus, when changing model plates and blocking any open cavities in the body of the model plate, and turning on the corresponding shut-off valves 15 through fittings 14 and 16, the common manifold 17 and the common shut-off valve 18, the data, now closed cavities, are connected to a vacuum system, which creates a vacuum in the designated cavities for lining the model plate with models with a polymer film according to the generally accepted technology for manufacturing vacuum-film forms.

Claims (1)

A model vacuum plate for the manufacture of vacuum-film casting molds, comprising a body with a cavity connected to a vacuum system, a replaceable perforated model plate, characterized in that the body cavity is divided by sealed walls into separate cavities, each of which is connected by separate fittings through shut-off valves with a common a collector connected through a common shut-off valve with a vacuum system, in the center of the common wall of the housing is a sleeve for the centering pin, and in the center of each otivopolozhnoy sealed wall internal cavities formed ebb-lug with bushings for the guide pins, the replaceable perforated plate model depending on its size set on the appropriate pins.