SU737104A1 - Mould-making method - Google Patents

Description

The manufacture of the mold according to the proposed method is carried out as follows .:;

The mixture from the feed bin 8 is loaded into the multisection dispenser 6, located at a height of 1.5-3 m from the fret of the flask /. Each section of the dispenser 6 has an autonomous high-speed shutter 7, which instantly opens upon a signal from the commander (not shown). The filling of the flask / mixture is carried out in zones. First, open the closures of sections located above difficult-to-fill and difficult-to-form zones of the form (zones between the models; zones between the models and the walls of the flask, zones with deep pockets, etc.).

FIG. 5, for example, zones A and B are the most difficult to compact. Separate parts of the molding mixture are accelerated to a speed of 5–7 m / s under the action of gravity and fill these hard-to-rest areas in the first place, and then the rest with lighter filling and sealing conditions. The last to be filled are the zones above the models. With such separate filling, parts of the mixture have a small area in the light, and therefore they encounter low air resistance in Schachte 5 and develop considerable kinetic energy, which is maximally used to compact the mixture.

Also, there is no additional energy loss due to the separation of the coma mixture into parts upon impact with the model, as would be the case if the whole coma falls.

Owing to this; as well as by selecting the required dose of the mixture in each of the sections of the dispenser, you can adjust the density of the mixture according to the zones of the flask depending on the requirements for formable castings in terms of surface quality, accuracy of geometry, and so on. Parts of the drop are additionally accelerated, for example, by applying compressed air to them, or the half-mold db is fully pressed, and even when pressed with a flat press block, the surface hardness of the form is 1-ore compact 1e s field is aligned with the other portions, and the hardness difference between them is 3.5 units. instead of 10–20 units, which occur during compaction of half-molds with the same conditions, but with filling the flask with a solid lump.

The application of the proposed method improves the quality of the manufactured forms due to more complete / use of the kinetic energy of the falling parts of the mixture, improving the conditions for filling the gaps between models, between models and walls of the flask, deep pockets in the models, leveling the density of the forms

the whole volume. This will increase the number of castings in the mold, reduce the consumption of the mixture per casting, reduce the scrap of castings for blockages, snakes, etc., as well as expand the field of application of the gravitational method of shaping to parts with a complex configuration, which will give a significant economic effect national households.

Claims (1)

Invention Formula A method of manufacturing a mold, preferably a foundry, comprising feeding the molding sand into a mold with its free fall, characterized in that, in order to improve the quality of the mold by increasing the uniformity of the density distribution of the mixture, the mixture is supplied differentially depending on the model configuration and consistently. The source of information taken into account during the examination: 1. Author's witness Stao USSR № 521991, cl. At 22 C 9/00,. piit.1 -2 -7 -J FIG. t Ljl 7 l ipui.f