SU18895A1 - Method for elimination of local non-densities during press molding - Google Patents

Description

The proposed method for eliminating local leakages during press molding is that an additional ground charge is pressed into the places corresponding to the deep troughs of the model, and reinforcing pegs (soldiers) are inserted into the additional ground charge to strengthen the protruding parts of the form.

To carry out this method, a device is proposed that consists of the one mounted above the flask, where molding is performed, a gate with a socket serving to transfer the ground From the bunker to the press piston, and vice which serves to install the soldiers in an additional charge of the ground.

FIG. 1 of the drawing shows a vertical longitudinal section of the tool; in fig. 2 - the same partial cross section of it; in fig. 3 is a partial view from above.

The proposed method consists in that molding in flask 1 is carried out according to the usual method of bottom pressing. The earth is pressed into it by the model plate 2 (Fig. 1 and 2) from under the accessory drawer 3. In the deep depressions of the model, such as in location 4, insufficient compaction of the earth can be obtained, since the side walls of the depression dragging up by force land and

they are not allowed to be compressed by the bottom of the cavity. In order to eliminate this drawback, it is proposed to introduce an additional portion of earth against the deep depressions of the model through the upper plate 5 of the forming press. Under the auxiliary bunker b there is a gate 7 with a nest 15. From the bunker. When filled with earth, flask J is let down along with. Heater 3 under the plate, 5 Gate 7 moves to the right, and its socket with the charge of the earth becomes in the position depicted by the dotted line 8. During pressing, i.e. during the lifting of the model plate 2, the piston 9 acts, squeezing an additional portion of earth from the bottomless gate 7 downwards. The piston 9 reaches the level of the bottom surface of the plate 5. Having risen up again, the piston 9 releases the gate 7 to return it to the bunker b. those. for a new charge, waiting for the next flask.

The described device can be used to strengthen the protruding parts of the form with the wagons (soldiers). A hollow 4 corresponds to a protrusion of a mold in which it is proposed to insert the pegs (or pieces of wire) during the pressing of an additional portion of molding earth. For this, the gate of the gate 7 on the way to position 8