SU707678A1 - Apparatus for making flask-less moulds - Google Patents

Description

The invention relates to foundry, in particular, to the manufacture of casting molds by pressing with precompaction of the molding sand mixture by injection.

A device for producing casting-Sh.1X forms with a lattice counter-model for obtaining casting molds by pressing is known. The device operates according to the method of bottom pressing by the model. The mixture is freely poured into the volume bounded by the flask and the filling frame, fulfilling the role of the molding chamber, and the model plate. Then a lattice countermodel is placed above the flask and the mixture is pressed;

A disadvantage of the known device is that it cannot be used to obtain casting molds by pressing with preliminary compaction of the molding mixture by blowing, since if there are open holes in the countermodel, the mixture blown into the molding chamber will spill. Owing to this, the pre-compaction of the mixture by injection before pressing, which, as is known, increases

uniform compaction of the form and speeds up the process.

It is also known to have a device for the manufacture of safety-free casting molds, containing in the horizontal plane a molding chamber with an injection hole in its upper wall, a logging goyovka and a model plate driven for inverse forward movement in a horizontal PLANET 2.

The essence of the invention is to increase the uniform distribution of the density of the mixture in the mold.

This chain is achieved by the fact that the device is provided with a grid to the molding chamber on the side opposite to the model plate, a grid element to the sealing element located on the non-working side of the grid element and movable in the direction perpendicular to its PLANE.

The drawing schematically shows the proposed device.

The device consists of a base 1, a molding chamber 2, a model plate 3, a lattice element 4, a sealing element 5 and a sandblasting head 6..

The device works as follows.

Before filling the working space 7 of the molding chamber 2 with the mixture, the lattice element 4 is pressed against the end part of the molding chamber 2, and the sealing element 5 closes the openings 8 of the lattice element 4. Model plate 3 is inserted into the molding chamber 2 and closes the working space 7. In this position. hole 9 is blown into the molding mixture. After filling the working space: 7 of the molding chamber with the mixture, the sealing element 5 moves in the direction perpendicular to the plane of the lattice element 4 and opens its opening 8 (perforation). Then, the mixture is pressed by the model plate 3. At the same time, the mixture, which is under a specific pressure exceeding the calculated one, is forced out through the open holes 8 of the grid element. At the end of pressing, the model plate leaves the molding chamber 2. Then the molding chamber 2 slides along the plane of the lattice element 4 and moves to the next position (not shown) to remove the compacted molding mixture (coma). Upon returning empty

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molding chamber 2 to its original position, the cycle repeats.,

F

formula of invention

A device for making a furnace-free casting molds, comprising a horizontally movable molding chamber with an injection hole in its upper wall, a sanding head and a model plate with a drive for reciprocating movement in the horizontal plane, which allows that, in order to increase the uniformity of the distribution of the mixture density and form, it is equipped with an adjoining to the forking chamber on the side opposite to the model plate, a lattice element IOM and a sealing element extending Assumption with broken sides trellis elemenga and movable in a direction perpendicular to its plane.

. Sources of information taken into account in the examination

1. USSR Author's Certificate No. 179436, cl. B 22 C 15/02, 1962.

2.Aksenov P.N. Foundry Equipment, Mechanical Engineering, p. 186, rice 172

1968.

GF-7

Claims (1)

5 claims A device for the manufacture of safety casting molds containing a horizontal movable forming chamber ¹⁰ ru with an inflatable hole in its upper wall, a sandblasting head and a model plate with a drive for reciprocating movement in a horizontal plane, characterized in that, in order to increase 15 uniform distribution of the density of the mixture In the mold, it is equipped with a side adjacent to the molding chamber on the side opposite to the model plate, a lattice element and a sealing element, married from the non-working side of the lattice element and movable in a direction perpendicular to its plane.