SU1338961A1 - Pattern and moulding box tooling - Google Patents

Abstract

The invention relates to a foundry and can be used in the construction of pallets and flasks used to make molds using vacuum. The purpose of the invention is to increase the reliability of the sealing form. The rig contains model plate 1 with model 2, pallet 3 and flask, 4, equipped with cavities 5 and 6. In flanges 12,13,14 grooves are made, connected to cavities 5, 6 with holes 19, 20. In the grooves there are inserts 21 22. The liners 21 are made in the form of a protrusion 26 and have a configuration of cavities. During evacuation, the film compresses the protrusion 26, the flask 4 of the depression 25 is installed on the protrusion 26. When evacuating the flask, the film from the protrusion 26 is transferred to the cavity 25. The use of the invention reduces the defect of the forms by eliminating the risk of depressurization of the mold. 2 Il. (L W1Z

Description

The invention relates to foundry and can be used in the construction of pallets and flasks used to make molds using vacuum.

The purpose of the invention is to improve the reliability of the sealing form.

FIG. Figure 1 shows the model equipment, general view; in fig. 2 — node 1 in FIG. one.

The rig contains model plate 1 with model 2 placed on tray 3 and flask 4. Tray 3 and box 4 are equipped with suction cavities 5 and 6 connected by nozzles 7 and 8 with a vacuum source (not shown). In the plate 1, model 2, wall 9 of the flask 4, there are vent holes 10 and 11. In the flange 12 of the tray 3 and the flanges 13 and 14 of the flask 4 (the flange 13 can also have one), on the side of the synthetic films 15 and 16, the grooves 17 are made and 18 connected to cavities 5 and 6 by holes 19 and 20. In the grooves there are inserts 21 and 22 installed with gaps 23 and 24 relative to the walls of the grooves. The liners 22 of the flasks 4, together with the side walls of the grooves 18, form flasks 25 on the flanges 13 and 14, a cavity 25. The surface of the liners 21 of the tray 3 that is lined with a film 15 is shaped as a protrusion 26. The protrusion 26 faces the cavity 25 (and the insert 22) and is made on the configuration of the counter quashes. The linear dimensions of the cross section of the protrusion 26 (h and b) are 0.8-0.9 sizes (H and B) of the cross section of the depression 25

(Fig. 2). With such a ratio between 40, the flow rate of the molding material and the sineway 25 and the protrusion 26 is formed. The film also minimizes the space that is sufficient, the film is molded through the fault of the equipment due to the exclusion of 15. The flask 4 also has a cavity, due to the danger of depressurization of the mold, filled with molding material 27.

Tooling works as follows.

A model plate 1 with model 2 is installed on the pallet 3 and the cavity 5 of the pallet through the nozzle 7 is connected to the vacuum source. A preheated film 15 is applied to the flange 12 of the pallet and the model plate with the model. Under the film a vacuum is created (through the holes 10) and 9 and under the action of atmospheric pressure the film stretches tightly compresses the model 2, plate 1 and protrusion 26. On the pallet 3 and model plate I shall be mounted on flask 4 (hollow50

45 Formula of invention

Model fixtures containing a model plate, a pallet and a flask, equipped with 1 cavities, grooves made in the flanges of the pan and flasks from the side of the synthetic film, connected to the cavity, through the holes and lined with the synthetic film inserts, installed in the grooves with gaps with respect to their walls, while inserts of the flask together with the side walls of the grooves form a hollow on the flask of the flask, I distinguish 01 and so.

55

0

five

thirty

25 on the protrusion 26) and is filled with the molding material 27, after which the preheated film 16 is applied to the flange 14 of the flask.

The cavity 5 of the pallet is disconnected from the vacuum source and the cavity 6 of the flask begins to vacuum, the molding material 27 and the depressions 25 of the flanges 13 and 14 are evacuated through the holes 11 and 20. The films 15 and 16 are pressed tightly to the molding material by atmospheric pressure. (compaction of the mold) and to the flanges 13 and 14, while the film 16 is drawn into the depression 25 of the flange 14. The film 15 at this moment from the protrusion 26 goes to the depression 25 (the projection prevents compression of the core of the film under the action of residual stresses and the film preserved This is the configuration of the protrusion and, accordingly, the depression). The finished mold is removed from the pallet 3, the plate 1 and the protrusion 26. The film 15 remains in the cavity 25, tightly pressed to it by atmospheric pressure, reliably sealing the resulting shape.

Thus, the execution of a part of the liner of the pallet in the form of a protrusion having the configuration of the counter flap provides for a tight clamping of the film to the hollow and, accordingly, to the flange Tg (fret) of the flask, which eliminates the release of the mold when the flask is removed from the pallet and assembled. As a result, the reliability of the rig increases. The application of the invention reduces

0

25

45 Formula of invention

0

Model fixtures containing a model plate, a pallet and a flask, equipped with 1 cavities, grooves made in the flanges of the pan and flasks from the side of the synthetic film, connected to the cavity, through the holes and lined with the synthetic film inserts, installed in the grooves with gaps with respect to their walls, while inserts of the flask together with the side walls of the grooves form a hollow on the flask of the flask, I distinguish 01 and so.

five

that, in order to improve the reliability of the sealing of the form, the inserts installed in the grooves of the pallet are made in the form of protrusions above the surface of the flanges of the pallet, correspond to the configuration of the depressions in the flask, while the linear dimensions of the section of the contribution are 0.8-0.9 dimensions of the hollow section.

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Claims (1)

The claims at once. A model plate 1 with model 2 is installed on the pallet 3 and the cavity 5 of the pallet is connected to the vacuum source through the pipe 7. A preheated film 15 is superimposed on the pallet flange 12 and the model plate with the model 15. Under the film, a vacuum is created (through holes 10) and 19 and under the influence of atmospheric pressure the film stretches tightly compresses model 2, plate 1 and protrusion 26. On the pallet 3 and the model plate 1 is installed flask 4 (in the bottom) Model-flask equipment containing the model plate, pallet and flask equipped with suction cavities, grooves made in the flanges of the pallet and flask on the side of the synthetic film connected to the cavities. Lugs and synthetic-lined liners installed in grooves with gaps relative to their walls, while the flask liners, together with the side walls of the grooves, form a cavity on the flange of the flask, characterized in that, in order to increase the reliability of sealing the molds, the liners installed in the grooves of the pallet are made in the form of protrusions above the surface of the pallet flanges, correspond to the configuration of the depressions in the flask, while the linear dimensions of the section of the liners are 0.8-0.9 dimensions of the section of the depressions FIG. 2