SU1235618A1 - Tooling for vacuum moulding - Google Patents

Description

The invention relates to a casting mold and can be used for the manufacture of molds of vacuum molds from molding materials without a binder 110 models with deep pockets.

and, the spruce of the invention, is to improve the structure, reduce the metal intensity of the tooling and cool the sealing film.

Figure 1 shows a vacuum mold tooling, a general view; FIG. 2 shows an elastic element when supplying compressed gas to its floor; in fig. 3 - the same, when vacuuming its cavity; Fig. 4 shows the equipment for vacuum forming when coated with H1I and sealed with a film; in FIG. 5, the equipment for vacuum forming and the fabricated half-mold.

The rig (FIG. 1) contains a base 1 with an in-pipe 2 for connection to a vacuum system (not shown) or a message with the atmosphere, mod.el 3 with a BIJICOKHM side bar and a movable forming part made in the form of an elastic element 4 sec. . To other around the perimeter of the otvertan1) 1 by the edges 5 in the upper part 6 of the model and connected autonomously with the vacuum system at the help of the pipeline 7, embedded in the model, and the flexible pipeline 8, (: | - Have a flask 9 with a phyterolter shell 10 and a pipe II for connection to a vacuum system. The xatsators and the vacuum system are not shown), the mold (Pz1I material 12 (Fig. 5), and the sealing of the film 13 and 14. On the model equipment, there is a pump 1, hole 15. The pocket 16 is connected autonomously at HOMOHUI the annular channel 17 T) of the pipes 7 and 8, either with a source of compressed gas or with a vacuum system. For heating the film there is an electric heater 18. A backflow valve is now in the form of a monolithic rubber plate 19 mounted on an elastic element 4 but. Two opposite sides of the plate perimeter, and serves to overlap the Verstov or 20 connecting these holes and the vacuum system (2 and 3). As a non-return valve, it is possible to use ninnel21 vulcanized in the wall of elastic element 4 (FIGS. 4 and 5).

Making the casting mold with the name of the invention will be described as follows.

Pipelines 7 and 8 from a source of compressed gas, for example, supply air at a pressure of 1.3–2.0 kgf / s to the annular cavity 17 and further to the pocket 16, while the rubber base 19 closes the openings 20 in the elastic element 4, which, being fixed by the edges 5 in the upper part 6 of the model, is curved and extended to the extreme upper position (Figures 1 and 2). On the flask 9 with the filtering shell 10, the sealing pallete 13 (for example) is fixed with the help of magnets), after which the film is heated by the electric heater 18, which is then removed from the onki zone by heating the film to 90-100 ° C, and The flask 9 with the built-in filter sheath 10 together with the heated metal filament. The film 13 is lowered onto the model 3 with the movable shaping part 4, while the bottom pipe 2 of the base 1 is connected to the vacuum system, and the sealed film 13 is sealed and the suction holes 15 are sealed. occupying the position shown in pa 4. Thereafter, the pipe 8 is disconnected from the source of compressed gas and connected to a vacuum system. As a result of this, the rubber platinum due to the dilution from 0.5–0.7 kgf / cm (i.e., the pressure drop across both cTOponi i rubber n, i), opens the hole 20 (fig.3), and The sealing film 13, in place with the elaslas, the element 4, is turned down and r completely covers the pocket 16, while the role of the check valve is retracted; the rubber plates 9 or the nipples 21 enter into the annular channel 17. As the height and depth are elongated, sealing of the film 13 in the pocket zone 16 corresponds to the depth of this pocket or it doesn’t like it no more than by 10%, then it clears ete quality of the model ,: itsovyvanie sealing film (5). The pressure of the compressed gas is selected on the basis that the surface of the film that reveals the protruding part of the elastic element at the pressure nei o was equal to or more than 10% of the top of the veneered pocket, i.e., 1.0 - 1.1. If this ratio is more than 1.1, then r is formed (nrry, nh phy to increase water

roughness of noBepxi-icjCTH castings.

The best is a value of 1.0, since the surface of the mold is along; is considered a dunk in the zone; a deep pocket, and a superstructure is a clean cast. The reduction in reliance is less than 1.0. deep car.map possible j; i3pbiiibi n,; | (h: ki, drive for marriage (k} rm1 1, but sock sand can spill and ofipaaoBi.iiiaTb in yes. the slightest clogging in the casting. Then, 9 molding mat 12, and iioc; i) ibranionic v11.1. 1 backs: it is covered over with a hermetic seal 14 and at nozzle 1 is connected to a 15 vacuum system. After E: W) the pipe 2 is disconnected from the vacuum system. it comes with the atmos- phere of the atmosphere, and the fabricated half-form is removed from the base (ani.

A | A second half-form is produced similarly. After assembly, the mold is fed to,; 1 injected, while the nozzle 11 remains connected to the vacuum system during pouring and 1US.1 is once (1H) solidified.

After knocking out the molds and blasting the flask, the tooling is ready for use.

Phage.2

Fig.Z

13

Phag4

U / 777 ////// 7 /////////// 7Х /// 7L

FIG. five

21

Claims (3)

1. VACUUM FORMING EQUIPMENT, comprising a base with a nozzle for connection to a vacuum system, a model with a tall block and a movable forming part, autonomously connected by a pipeline with a vacuum system, a flask with a filter sheath and a nozzle for connection to a vacuum system, characterized in that, in order to simplify the design, reduce metal consumption and cool the sealing film, the movable forming part of the model is made in the form of an elastic element with check valves, the edges of which are fixed enes on the perimeter of the top of the model. 2. Snap on π. I, characterized in that the check valves are made in the form of monolithic rubber plates, holes are made in the elastic element, overlapped by said plates, which are fixed on the elastic element from two opposite sides of the perimeter of each of the plates with a step equal to the hole pitch in the elastic element. ABOUT 3. Snap on π. 1, characterized in, <β that the check valve is made in the form of a nipple mounted on an elastic element. SU „„ 1235618 Fig 7