CZ188595A3 - Device for casting mould feed - Google Patents

Abstract

Conveyor system for foundry moulds which are assembled from similar mould parts and pushed from a mould chamber to a conveyor track comprising a rail system of individual parallel rails which are horizontally movable. <IMAGE>

Description

Technical field

The present invention relates to a device for moving casting molds, in particular vertical frameless casting molds.

In the production of vertical framless molds from raw sand, a molding chamber is used to produce casting mold parts between two opposing models, one of which also serves to extrude the finished casting mold onto a guide where the casting mold parts are assembled into a continuous row and where they move in the same tact with their production. Between the casting mold parts there is a molding space which is filled in liquid iron or metal.

BACKGROUND OF THE INVENTION

A casting or cooling table is used to accommodate a number of molds. This table generally comprises at least 5 rails of 25 to 30 mm wide flat-iron bars having machined sliding surfaces.

The friction coefficient between the mold series and the sliding surface is generally between 0.25 and 0.30. During the displacement of the mold series it is formed on the last added sand. the form of the pressure load P according to the equation ^P ” ^P 1 ^{+ P} 2 where

P ^ = friction resistance = ju x N

N - mass of series .for μ = friction coefficient

Ρ ^ = inertia force g = acceleration of a series of sand molds

If the pressure resistance of the molds and the degree of occupancy of the model plate are known, the permissible length of the casting and cooling table can be calculated so that the risk that the last block of sand collapses under pressure can be avoided.

In modern vertical frameless molding machines, the high output of the machine results in a corresponding high acceleration g of the mold series and therefore the permissible length of the casting and cooling table is reduced.

However, this causes either a reduced power of the molding device or an extension of the casting and cooling table beyond the maximum permissible length.

Transfer to a secondary cooling bath is also problematic. To prevent damage to the casting during the transfer, the casting must be solidified enough to form a solid support shell.

Another problem that arises when moving a series of molds is the possible deformation of the series, which can also cause damage to the castings,

With the use of the known step conveyor device, there is a risk of scalding sand onto the rails, since part of the rails performs a stroke movement and is occasionally separated from the sand.

SUMMARY OF THE INVENTION

From this prior art, it is an object of the present invention to provide a device for moving a number of casting molds to overcome these drawbacks of known conveying devices.

This object is solved by the characterizing part of claim 1.

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Further preferred embodiments result from the dependent claims

Overview of the drawings

The invention will be explained in more detail with reference to the accompanying drawings.

Fig. 1 shows a view of the transport system; Fig. 2 shows a view in the direction A - A of Fig. 1.

DETAILED DESCRIPTION OF THE INVENTION

The casting and cooling table 1 has a plurality of upright rails 2. The rails 2 are singly or in pairs or all movable together horizontally forwards or backwards in the longitudinal direction of a row of molds. The rails 2 move on rollers 3. The ° 1 shows a system of rails 2, pulleys 2 ^and bearing racks forming a support system for a series of molds comprising a number of sand molds 2 on a casting or cooling table 1.

The feed of a number of molds is performed as follows:

Part of the molding machine, the press plate 2 ^{with the} model 12, which is also extruded to the molding chamber compacted sand mold from the molding chamber, it moves part of the sand mold 5.1, and connects it to a rail system 2 with a previously-formed portion of the sand mold 5.2, and regulavotelným pressure on the composition of the mold ? _Ξ · Ρο composition parts sand molds shifts the entire track system of the power mold part B in advance.

The forward movement can be induced either by pushing the press plate 2 or by a separate drive 14 of the casting and cooling table, which operates synchronously.

Once the rail system with the series of molds has moved forward by force B, the press plate is pulled back and the model is separated from the mold.

The rail system now returns to its home position.

The rails may retract individually, with the frictional forces between the rails being retracted less than the sum of the frictional forces of the stationary rails.

With respect to the frictional forces, the rails can be pulled in pairs or sections. Prior to retracting the rails with the piston-cylinder unit, the clamping jaws 2 arranged on both sides of the mold part 5.1 are actuated. any movement of the last mold part 5.1 relative to the mold series 2 ·

For enhancing performance, the inventive pusher device allows the press plate 6 together with the row of molds 5 not to move forward by the force of the mold B, but to retract the press plate immediately after folding the mold part 5.1 with the mold part 52 and thereby being available for new formation.

A series of molds are then immediately after the pressing plate separation _f

6 with the model 12, the length of the mold part B departs from the mold part 5.1 by the action of its own drive system 7. The retraction of the rails 2 takes place in the same manner as described above.

To avoid Pullout model 12, or the acceleration due to a series of molds to separate the mold parts from the mold part 5.1 5.2 predicts the above-acting buckle 10 which is connected with the portal 11 of the outer pair of ^{rails, and} _2 j ^e pístválec controlled unit.

The clip 10 is pressed immediately after joining the mold part '5Τΐ ~ 5 ~''. orniy ~ 5 72 7] before ^{, get} back and eat it maybe ~ ~~

12, onto the mold part 5.1 and remains in this position during the movement of the rail system 2 with the row of molds 5.

When the feed is complete, the stationary clamping jaws are first pressed. 8 against the mold part 5.1 ' and then the clip 10 is released.

Claims (5)

PATENT CLAIMS 1. Apparatus for conveying casting molds composed of identical mold parts, S1 which can be slid out of the molding chamber onto a guide formed by the rail system, the rail system having individual parallel rails, characterized in that the rails can be moved horizontally. · # 2 '. Device according to claim 1, characterized in that the rails can be moved individually or in groups. Device according to claim 1, characterized in that the rails are provided with a drive system. . ......... Device according to one of Claims 1 to 3, characterized in that the rails can be moved simultaneously. Device according to one of Claims 1 to 4, characterized in that the rails can be moved forwards or backwards. Device according to one of Claims 1 to 5, characterized in that separately actuable, horizontally or vertically acting clamping jaws are provided for holding the last parts of the sand molds.