SU1519822A1 - Method of vacuum moulding and tooling for making same - Google Patents

Abstract

The invention relates to the field of foundry and can be used to develop technology and equipment for the preparation of castings of bodies of rotation in molds with rods made by vacuum-film molding. The purpose of the invention is to increase productivity. The method consists in that the mold and the core are made in a single cycle. After sealing the flask, the film is cut along the contour of the model, the core is removed from its cavity and immersed in the assembled shape. The rig contains a model plate with a "bottom" model, a sealed cavity that communicates with a vacuum system, a "bottom" box, a frame fixed on the upper side of the box and connected by means of an elastic insert with a plate in the form of a rod. 2 sec. f-ly, 3 ill.

Description

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The invention relates to foundry and can be used in the development of technology and tooling for the manufacture of castings of rotation bodies in molds with rods made by vacuum-film molding.

The aim of the invention is to increase productivity by combining technological operations over time.

The method consists in that the mold and the core are made in a single cycle. After sealing the flask, the film is cut along the contour of the model, the core is removed from its length and lowered into the assembled shape.

FIG. I shows the bottom half-form, FIG. 2 - top half-form with a rod; in fig. 3 - form assembly.

The equipment for vacuum shaping contains (Fig. I) model plate 1 with a bottom model 2, a sealed cavity 3, which pipe 4 communicates with a vacuum system (not shown), cavity 3 is reported

through) tsas;; punching. unscrew ..) 5 with an embossing surface, on ,. miyu-i-g tonic film 6, shhlch 7N ;;. sh, which contains the filter. 111 shell 8, a pipe 9 for connecting to an external vacuum system, a frame 10, mounted on the flask control panel 7 and connected through an elastic contribution 1 with a plate 12 along ;; ,:) 1 ac rod, forming together with the shaping surface a y. Model 2 repN-.e-tichic cavity filled with so-called for- BO4HLIM material 13.

In addition, the tooling contains (phi :./.-Lo. Piece plate 14 with top model 5,, -; Itnikoy system 16, frame 17 in the form of a filter shell with sleeve 18, garnsp (. Hooks, 19 and eepi, goy 20, with the model 1st performed; | with a cavity according to the configuration of the Ciller 11m and bridging} 21 i-, one of the fixed fixation elements. TI krme,.), G, mode, n, iTc; - i n,; 14 there are .note and hyulost 2 2 which using narpyt. KH 23 pod;,)

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is connected to the vacuum source or communicates with the atmosphere, while the cavity 22 is connected through suction holes 24 with a decorating surface lined with synthetic film 25, the top 26 of the top with a filter sheath 27 and a nozzle 28 for connection to an external vacuum system. The core and half-molds of the top are made of dry molding material 29 and are isolated from the surrounding atmosphere using synthetic film 30. To connect the flask 7 of the bottom, the flask 26 of the top and the frame 17 to the vacuum source are flexible vacuum wires 31 - 33, respectively (Fig. 1 and 2).

FIG. 3 shows a mold made by vacuum forming by means of a bottom half-form 34, a top half-form 35 and a vacuum bar 36.

The fabrication of the mold and the core by vacuum molding is carried out as follows.

The bottom half-mold is made (Fig. 1), while on the bottom model plate 1, a model 2 is installed, made of metal wool or wood, which is coated with a heated synthetic film 6 by suction of air through the holes 5 through the holes 5 and the external pipe 4. A vacuum system (not shown) is then installed on the model plate 1 with model 2, the flask 7 of the bottom is installed and the mold 7 is filled with dry molding material 13 to the upper level of the model 2, then the frame 10 is fixed on the mold slide control 7 and material 13 and model 2, the plate 12 is lowered under the sign of a rod with an elastic liner 11, vibration molding of the molding material 13 is performed, the nozzle 4 is disconnected from the external vacuum system, and the external vacuum system is connected via a flexible vacuum wire 31 to the nozzle 9 The molding material 13 in the closed space between the model surface of the model plate 12, the insert 11 and the walls of the flask 7 is subjected to evacuation, compacted and the bottom mold is ready. A lifting mechanism (not shown) removes the bottom half-form from the model 2 bottom, turns it over and installs it to assemble the mold.

After that, the half-mold of the top and the rod are made on the model plate 14 of the top, a model 15 and a sprue system 16 are installed, which are coated with a heated synthetic film 25 by vacuuming through the holes 24, the hermetic cavity 22 and the nozzle 23 connected to the external vacuum tube. a system (not shown), after which the surface of the film is coated with nonstick paint, and on the model 15 a frame 17 is installed as a filter casing, which is centered by a protrusion 21.

After filling and vibrating the dry molding material 29 and applying the synthetic film 30, the nozzles 18 and 23 put on flexible vacuum wires 32 and 33, which are connected to a vacuum source (not shown), the nozzle 23 being disconnected from the vacuum source and communicating with the atmosphere. After that, the synthetic film 30 is cured along the upper end surface of the model 15 and, by means of the earring 20, hooked on 19 with a lifting mechanism (not shown), the rod is removed from the top half-form, after which the half-form is removed from the model 15.

The finished mold half of the top is mounted on the mold half of the bottom, after which a vacuum rod 36 is installed in the sign portion of the bottom mold 34 of the bottom (Fig. 3).

After assembling the casting mold, the casting is performed. Cooling, eat the top of the half-mold together with the casting, the deviation of the vacuum from both half-molds and the top and knockout of the casting. After removing the frame from the flasks, removing the frame with a metal element and an elastic liner, blowing them with air, the equipment is ready for reuse.

Thus, the proposed method does not require separate manufacture of half-molds and a rod, the production of a rod is carried out in an advanced technological cycle with a half-form of the top, and labor productivity increases.

Claims (2)

Invention Formula 1 Vacuum forming method, which includes wrapping the model with a synthetic film, installing the flask, filling it with a molding material without a binder, sealing and evacuating the flask, removing the model and installing the core with a frame obtained by vacuum forming, characterized in that technological operations in time, the prongs are made together with the form, while after sealing the flask and connecting to the vacuum system, the pleica is cut along the contour of the model, Along the core from its cavity and lower it into the assembled shape. 2. Equipment for vacuum forming, containing model and optional kits, a core for making a rod, made in the form of a filtering shell, characterized in that, in order to increase productivity by combining technological operations in time, it is provided with an elastic insert placed in making the bottom half of the form plate placed (from the lower side of the flask, and a support frame fixed on the upper side of the flask, and an elastic liner is fixed around the perimeter of the flask with a plate on one side and U 11 12 ///////////// /// Г ///// (// /////////// / / 112225 2f 2 25 a support frame on the other, while in the model for the manufacture of the upper half-mold, a cavity with a fixing protrusion is made. srig.1 25 J Fig.Z