SU1355352A1 - Moulding box for vacuum moulding - Google Patents

Abstract

The invention relates to foundry, in particular, to equipment for vacuum forming, and allows to obtain high-precision castings from ferrous and non-ferrous alloys by the method of vacuum-film forming with vertical casting. The purpose of the invention is to increase reliability, versatility, efficiency during vacuuming and compaction. Flask has a welded construction. The body of the flask consists of a carrier contour made of channels 5 and 6 strips forming the suction cavity, on which the side walls 7 are inclined at an angle of 30-45 ° to the working fret. The counter chamber is closed with a lid. On the inside of the side walls, mesh filters 8 are fixed at full length, fixed by strips 9 and bolts 10. Vacuum grooves 11 are located along the contour of the working mode of the flask to hold the polymer film. Krishka flask closes the boot window. It consists of a welded frame 12 on the longitudinal sides of which the diaphragm 13 itself is bolted, which plays the role of a polymeric film and, when evacuating the form, seals the contour of the loading window. In the absence of a vacuum in the flask, the Kirsch clamp is applied by the force of the springs. On the end sides of the bolt, the axles of the lever system, on which the bolt is hung, are fastened and the elements for contact with the devices for opening and closing the lid when working on an automatic casting line. 5 il. A- f. O1 ate ICO ate Yu 1 FIG. four

Description

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The invention relates to foundry, in particular, to tooling for vacuum forming.

The purpose of the invention is to increase the versatility, reliability and efficiency under vacuum and compaction.

FIG. 1 shows the flask, general view; in fig. 2 - the same, top view; in fig. 3 - the same, side view; in fig. 4 shows section A-A in FIG. one; in fig. 5 is a section BB in FIG. 3 (lever system with fastening elements of the nose and elastic diaphragm).

Flask has a welded construction, consists of standard rolled sections, has sufficient rigidity with a relatively small mass and labor intensity of manufacture.

The flask body 1 (Fig. 1) has a flange 2 for connection to the vacuum system. The suction of gases is carried out through the opening of the flange 2 and the connecting pipe 3 of communication with the cavity of the tin. Counter-mold flask is closed with 4.

The flask body consists of a bearing contour made of channels 5 and strips 6, forming a suction cavity, on which side walls 7 rest, inclined to the working fret at an angle not less than the angle of repose of the molding material. For

quartz sand the angle of repose is 45 °; for distensive sillimanite sand, it is on the order of 30.

If the angle of inclination of the side walls is less than the angle of repose, the filling of the flask with the molding material worsens, the final shape density in the corners is insufficient and requires additional reinforcement with additional vibration.

On the inner side of the side walls, mesh filters 8 (Fig. 4), fixed with strips 9 and bolts 10, are located along the contour of the working mode of the flask, vacuumized grooves 11 are located to hold the polymer film.

Lid 4 flasks closes reduced boot area. It consists of a welded frame 12, on the longitudinal sides of the cat which is fixed the actual diaphragm 13, which plays the role of a polymeric film and, when evacuating the mold, seals the contour of the loading window.

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In the absence of a vacuum in the flask, the lid is pressed by the force of the springs 14 (Fig. 5). On the end sides of the cover, the axis 15 of the lever system 16, on which the cover 4 is suspended, and the elements 17 are attached to contact the device for opening and closing the cover when operating on an automatic casting line.

FIG. 3 thin lines show the trajectories and the open position of the bolt at the time of forming. The dimensions of the levers and the choice of their points of attachment provide the trajectory of movement of Krish 4, by which it is first raised and then retracted to the side. This eliminates the friction of the elastic diaphragm 14 against the edge of the loading window of the flask.

Flask works as follows.

Flask is installed on a model kit, on which a film has already been applied in hot condition. 4, the flask is retracted to the side and releases the loading window, through which the flask is filled with sand and vibrated. Then, the cover 4 is closed and then the vacuum in the flask is turned on.

Sealing is carried out on the side of the working mode of the flask with a polymer film, and on the side of the control unit, by an elastic diaphragm 13, which is pressed under the action of atmospheric pressure along the entire contour of the loading window.

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After the metal is poured into the mold, the film on the side of the working mode burns out, and the diaphragm 13, located in the zone of cold sand, remains intact and can be reused.

When the vacuum is removed from the mold and then transported to the casting removal position (in a vertical position), the sand does not spill out of the mold, since the diaphragm remains pressed to the contour of the loading window by the force of the springs 14.

The use of flasks on the line allows to increase the reliability of work, reduce the laboriousness of manufacturing, tooling, improve the surface quality of castings by reducing the time of mold evacuation after metal casting and thereby save power for the vacuum units, and also save polymer film and Reduce the consumption of sealing material.

Claims (1)

Claim invention Opoka for vacuum forming, mainly for vertical casting, comprising a hollow body with side walls, a ventilation suction system and a supporting nozzle, characterized in that, in order to increase reliability, versatility. five ten efficiency in evacuation and compaction, it is equipped with a cap, made in the form of a frame with an elastic diaphragm and located on the side of the flask control, and a device for opening the cover, made in the form of spring-loaded levers, and the side walls of the body consist of a vertical part and an inclined hour ti, located at an angle of 30-A5 to the horizontal plane. 2 3 and one- / four / Jl Figg  | Mf  lllNll ,,,,,, I 11111111 111 111111 F1 I  I I I I I M lliijiJiLLiiLi Ml and FIG. 2 111 .five Compiled by A. Yusufovich Editor N. Shvydka Tehred.Hodanich Proofreader V. But ha Order 5742/11 Circulation 741 Subscription VNIIPI USSR State Committee .on matters of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4