SU910319A1 - Flask for vacuum moulding - Google Patents

Description

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The invention relates to casting production} namely, the design of flasks for vacuum film forming.

Known mold for vacuum molding of casting molds, made with a replaceable filter sheath in the form of a model, increased by the thickness of the working cavity. The disadvantages of this flask are the complexity of its manufacture, as well as difficulties in loading the filler into the cavity between the shell and the model.

Also known is a support comprising perforated tubes with filters, a housing, the cavity of which communicates the tubes with a suction system, and supporting pins located on the opposite walls of the housing on the outer side of them G2.

However, to create such a vacuum in the cavity, a hose is needed to communicate this cavity with the vacuum pump. In the presence of a long

hose operations are complicated by operations with flasks, such as suspension, transfer, inversion, etc.

Closest to the proposed flask is a housing with cavities, a suction system, a configuration following the contour of the model, and channels connecting the suction system and a housing with cavities with a vacuum pump 13.

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However, in large volumes, it is difficult for the perforated pipes with filter sheaths to be wired under the conditions of using models of complex geometric shapes, where the pipes are for

IS ensuring equal strength of the form in the flask should repeat the contours of the models. The operations on the implementation of filter shells on pipes are also complex. When operating in case

20 damage to the filter shells difficult to replace them.

Claims (3)

The purpose of the invention is to simplify the construction and operation of the flask. 391 The goal is achieved by the fact that in a flask that includes a case with cavities, a suction system, a configuration that follows the contour of the model, and channels connecting the suction system and a case with cavities with a vacuum pump, the suction system is made in the form of hollow crosses . Figure 1 shows the flask in section; figure 2 - flask in the plan; na. Z - section aa of FIG. 2; 4 shows a section of a half-form and a plate with a model; at 5, a possible variant of the design of hollow cross-fins. Along and across the hull I there are hollow crosses 2, which are prepared outside the flask, and then mounted inside its hull. Hollow wedge-shaped crosses 2 have the necessary number of holes 3, filter 4 of non-combustible material (metal mesh, fiberglass, protected by grille 5. In the casing around the perimeter of the flask: a cavity 6 is made, connected to the floor of 7 ribs 2 through holes 8. The cavities of the longitudinal and transverse ribs are also interconnected by openings 9. Trunnions 10 with openings 11 for connecting to a vacuum pump are made on the two opposite sides of the body.The plate 12 on which the model 13 is mounted is made in the form of a hermetic box, floor Arm 4 of which is connected by through channels 15 in the plate and models with a vacuum system (suction system) through channel 16. In making the mold, synthetic films 17, 18 and a filler are used 19. The device works as follows: Model 13 is mounted on plate 12. Synthetic film 17 heat and impose on the plate 12 with the model 3 and gating system (not shown). At this time, the air from the space between the shaping surface and the synthetic film 17 is sucked through the channels 15, the cavity 14 of the plate 12 using a vacuum pump (in the drawing is not according to Ka3aHj connected to the suction channel 16. At the same time, the film 17 is attached to the forming surface of model 13, then the flask is mounted on the plate 12 with model 13 and filled with molding molding refractory mixture 19. The mixture in the flask is compacted by vibration . The top of the gaiter is covered with a synthetic film 18. After that, the vacuum system (suction system) is disconnected from the model Plate 12 and under-. they are connected to the flask, from which air is removed through the opening 11 of the trunnion 10, the cavity 6 of the flask box, the holes 8, 9 of the cavity 7 of the cross-fins 2, the filter 4 and the holes 3 of the grille 5. In this case, a vacuum is created and a film 17, 18 are pressed against the mold filling agent 19, preventing the relative movement of the particles. The model plate with the model and the gating system is removed from the flask. So get one half-form. The same forming operations are carried out in the manufacture of the second half-form. Both mold halves are harvested. The mold is ready. Figure 5 shows a variation of the flask with cross-fins 2, made along the contour of the shaping surface of the model 13. The shape of the cross-crosses provides a uniform suction of air from the entire volume of the flask. The invention of the flask for vacuum forming, comprising a housing with cavities, a suction system, a configuration repeating circuit of the Model, and channels connecting the suction system and a housing with cavities with a vacuum pump, so that that, in order to simplify the design and operation of the flask, the suction system is made in the form of hollow crosses. Sources of information taken into account in the examination 1. The author's certificate of the USSR No. 603486, cl. B 22 C 21/00, 1976. 2. USSR author's certificate number 183906, cl. B 22 C 21/02, 1963. 3. The author's certificate of the USSR K 613703, cl. B 22 C 21/00, 1976. R R figure 1 -one , .G t. L. IJI.Ij . Phage. If