SU774772A1 - Equipment for vacuum moulding - Google Patents

Description

(54) ACCESSORIES FOR VACUUM FORMING

one

. The invention relates to the field of foundry, in particular to a tool for vacuum forming.

A known tooling is to implement a vacuum molding process for a casting mold, including an open mold filled with dry molding material with a horizontal connector and a built-in filter sheath that forms the vacuum chamber with a sleeve for connecting the upper and lower model plates to the flask walls with models lined with synthetic film and corresponding bases having cavities for connection to a vacuum source, while the top model ita pressuyushetch mounted on source device and the casing is mounted on shock absorbers to provide vibrashyunnogo seal forming material in the flask 1ll.

Also known is the tooling, the implementation of the method of vacuum molding of a casting mold, containing an open pit filled with dry molding material with a horizontal connector and a built-in filtering sheath, forming a vacuum chamber with a pipe for connecting to the vacuum source, the upper and lower model plates with models, lined with flasks 10 synthetic film, and the corresponding bases and imitation cavities for connection to the vacuum source, while the upper model plate is equipped with a device sasyvayuschim

ts pipeline to remove the molding material from the zone of contact of the models lined with synthetic film, and the rigging is installed on shock absorbers to provide a vibration seal20 of the molding in the QTl flask. It should be noted that during the operation of the rig, taken as proto-Pa; The mold is first filled with a molding mat with a bottom model, and then the upper model is applied. In the result, the molding material enters the zone of contact of the models, which then with the metal enters the mold when it is poured into the working cavity. To prevent molding material from entering the working cavity of the mold, the upper model. The plate is equipped with a device with a suction pipe, which considerably complicates the equipment that implements the method. In addition, when models are in contact, it is difficult to ensure that the model1 plates fit snugly along the flask contour, and, conversely, when the model plates fit snugly along the flask contour between the contacting models lined with synthetic film, a gap is formed that is molded (M material when pouring into the working cavity of the mold. Thus, the disadvantages of the prototype are: the complexity of the tooling, the complication of vacuum molding, the possibility of the molding material getting into the working cavity of the mold when The purpose of the invention is to provide simplification of equipment, vacuum molding and elimination of the molding material into the working cavity of the mold during casting. To achieve this goal, the proposed equipment is equipped with a loading window for the molding material limited to the side walls of the upper model plate and its the base, made with a slope, and the wall of the flask; moreover, the loading window is isolated from the atmosphere by a synthetic fabric that revets the upper model plate with the model. One of the two contacting models, lined with synthetic film, is provided in the contact zone with an insert of elastic material. FIG. 1 shows the equipment for vacuum forming, general view; in fig. 2 - the same, when filling the mold with a molding mat; in fig. 3 casting mold; in fig. 4 — equipment for vacuum forming with a square loading window; in fig. 5 - the same with triangle loading window. Equipment for vacuum forming includes an open I-shaped box with a horizontal connector and an integrated filter sheath 2, forming a vacuum chamber 3 with coarse 4 with 24 walls of the flask for connecting to a vacuum source, the top 5 and, the bottom 6 model plates with models 7, 8 and 9, lined with synthetic film 1O, C, and the corresponding bases 12. 13 having cavities 14, 15 for connection to a vacuum source. The rig is equipped with a loading window for the molding mat, bounded by the side walls 16, 17 of the upper model plate and its base, made with a slope, and the wall of the flask; a plate with model 7 provided with an insert 19 made of an elastic material (for example, soft rubber) to ensure that the model plates fit snugly along the contour of the flask and prevent the molding mat from entering Series in the working cavity of the mold when casting. The suction ports 2O and 21 provide the cladding of the models with the aid of the sockets 22 and 23 intended to connect the models to a vacuum source. Dry molding material 24 is used for vacuum forming. FIG. 2 shows a hopper 25 filled with a mold material 26 and provided with a drive gate valve 27 blocking the flow of molding material into the mold box. To hold the upwardly folded film 18, a clip 28, for example magnetic, serves. The loading window for the molding material can be located in the corner of the flask and have the shape of a triangle (see Fig. 5). The equipment for the vacuum works as follows. Model 8 with stand 9 is faced with heated synthetic film 11 by connecting cavity 15 to a vacuum source. Then, the bottom of the model plate is installed on the I side, on which the top model plate with the base 12 and the model 7 is mounted on top, lined with a synthetic film H, having a bent synthetic film 18, which is held by the clip 28, as shown in FIG. 2 An insert 19 made of an elastic material, for example soft rubber, provides a snug fit to the flask of model plates, fixed in place.

with the help of retainers relative to the flask I, the assembled equipment is mounted on the vibrating table. the shutter 27 opens, and the dry molding material 26 is fed into the cavity of the flask, subjected to vibratory compaction. After filling the molding box I with the molding material, the tooling is taken out of the zone of the hopper 25, the clamp 28 is removed, and the loading window is closed by a bent synthetic film 18, which isolates the flask cavity from the atmosphere, while the nozzle 4 is connected to the vacuum source, and the nozzles 22 and 23 are disconnected from the source vacuum and communicates with the atmosphere. Then the top 7 and bottom 8 models with stand 9 are removed, and the top half of the mold is ready for assembly from the bottom, which is made similarly to the top by the method of vacuum forming.

The assembled mold (see Fig. 3) is fed to the fill. After solidification of the casting, the flasks are disconnected from the vacuum source, and the casting together with the molding material is easily removed from the flasks. After blasting the flask, the rig is ready for reuse. Form

ula invention

Claims (2)

I. Equipment for vacuum forming, containing an open flask filled with dry molding material with a horizontal connector to the built-in the filtering shell forming a vacuum chamber with a flask with a pipe for connecting to a vacuum source, fixed between the flask and an upper and lower model plate with models; lined with a synthetic film, and bases having cavities with pipes for connecting to a vacuum source, distinguish so that, in order to simplify the molding and tooling, it is provided with a loading window for the molding material, limited by the side walls of the upper model plate and its base, made with a slope, and s walls of the flask, and the boot window is isolated from the atmosphere with a synthetic film, revealing the top . . model plate with model. 2. The equipment according to claim 1, characterized in that, in order to ensure that the model plates do not fit snugly around the mold box and prevent the molding material from getting into the working cavity of the mold when casting, one of the two contact models coated with a synthetic film, fitted in the contact zone with an insert of elastic material. Sources of information taken into account in the examination I. Japan Patent N 52-9569, cl. In 22 C 9/02, published. 03.17.77. 2. Japan patent No. 52-957O, cl. In 22 С 9 / О2, published. 03.17.77. P rs If tPut. V