SU120312A1 - Shell Mold Making Machine - Google Patents

Description

Machines containing a pneumatic device for feeding a mixture from a hopper and a rubber diaphragm, which prepresses the shell, are used to manufacture shell molds.

The proposed maschina is more perfect than the known similar maschiny, as it gives greater performance. This is achieved by the fact that its model plates are pivotally connected in the form of a box, which, together with the bunker, forms a closed space for blowing the mixture.

FIG. 1 shows the proposed maschina in general; in fig. 2 - sectional sandblast bunker; in fig. 3 and 4 are diagrams for filling the box with molding sand models.

The machine is made in the form of a carousel table / on which model plates 2 with shell half-molds are mounted. Shell half-molds are formed simultaneously on five model plates 2 arranged in space so that a box 5 is formed, five faces (one horizontal and four vertical) make model plates, and the shchest (lower horizontal face) is open. Through this facet, spraying of models with separating composition, blowing the mixture and dumping it, supplying a pressing device and introducing a dome-shaped ceramic body with electric heaters to solidify the shell half-molds are carried out at the respective working positions of the machine. At the removal position, the box of 3 model plates is opened with the help of a special mechanism and the shells are removed, which fall onto the belt conveyor.

For injection into the molding sand box, it is installed above the blowing hopper in the form of a tank 4 with a pressing cover in which blown nozzles 5 are inserted. In the middle of the sand-blowing bunker there is a pre-press block 6, which is a cylinder of thin

steel with holes in the lateral and upper horizontal surfaces. A rubber bag 7 serving as a pressing diaphragm is pulled over this cylinder. To fill the box 3 with the mixture, it is placed above the sandblasting bunker and compressed air is fed into the channels 8, as a result of which a subpressing block 6 is introduced into the middle of the box. Then, a molding mixture is blown into the channels 9 into the box. At the end of the injection of the mixture, the air through the channel 10 is supplied to the pre-compression block 6. At the same time, its rubber diaphragm 7 is stretched and it prepresses the casing.

Subject invention

A machine for making shell molds using compressed air to feed a mixture from a hopper and a rubber diaphragm for pressing the shells, characterized in that, in order to increase productivity, the model plates are hingedly connected in the form of a box, which together with the bunker forms a closed space for blowing the mixture.