EP1299201B1 - Sliding closure for casting molten metal - Google Patents

Abstract

In a slide valve closure for the casting of a metal melt a slider plate and a stationary closure part are braced against each other by means of spring units or by other means. There is provided a casing framework attachable to a mould or the like, in which is fixed a detachable casing part on which the spring units are held and in which the stationary closure part and the slider plate can be accommodated. This allows safe operation and simple and rapid mounting and dismounting of the slide valve closure.

Description

The invention relates to a slide closure for casting of molten metal, with at least one stationary one Closure part on a mold or the like, as well as with this movable slide plate, as well an associated refractory plate unit.

In a known slide closure for a die casting device according to document CH-A-415 972 the riser of a casting furnace at the top with a provided the melting furnace sealing cover plate. On This cover plate is a slider closure with a fixed plate, above a slide plate and arranged above this existing block part, on which the mold is adjustable.

In another slide closure according to the document DE-A-12 93 962 is the same on the underside of Mold installed. The slide lock is here with a lower end part, the slide plate and a assembled above this stationary plate.

In these known slide closures consists of fundamental disadvantage in that a tightness between the slide plate and the below or above it part, with which they each open or Closing is in sliding contact, is not guaranteed. From this, between these very easily molten metal, which usually has a low viscosity, incorporated. Melt drawn in between these plates usually solidifies quickly, which is already after few moves to block the Slider plate can lead.

From DE-A-33 22 542 is also a slide closure known with two plates. In this slide closure the plates are joined together by means of a printing cylinder pressed, which act on the mold. This kind of Bracing the slide plates on the mold is disadvantageous, especially with large molds, as they used for example for the production of engine blocks be such a docking of the pressure cylinder to the Casting already because of the difficult to control Weight and size of the mold is undesirable. It can beyond that also no safe seal between the Panels are guaranteed.

In US-A-5,400,930, finally, a sliding closure described, in which two mutually displaceable Plates are arranged in a housing. The plates are of springs in a manner not shown pressed together. The housing in turn is in one arranged further housing and springs so upwards pressed that the top plate a sleeve in the container tight followed. The container is in the conventional manner on the Top of the sliding closure arranged. The melt flows down through the closure.

The present invention has the object based on creating a slide closure, which is designed so that with him a reliable and economical operation of a die casting device or the like in total and here the slide plate or closure parts a long Durability should have.

This object is achieved by a slide closure solved with the features of claim 1. advantageous Embodiments of a slider closure according to the invention are specified in the dependent claims.

With this novel slider closure are optimal Requirements for an economical insertion a slider closure in such Druckgiesseinrichtung or the like has been created. The slide plate and the closure parts can do this without replacement up to several hundred sprues of melt be used in the mold or the like.

In a very advantageous embodiment is an on the Mold or the like attachable housing frame provided in which a detachable housing part is fixed, on which the spring organs held and the stationary Locking part and the slide plate are receivable. With this removability of the housing part of the housing frame can be a very simple and quick disassembly or Assembly of the closure can be achieved on the mold.

For a maximum possible service life, the refractory Slide plate and the at least one closure part as Main component graphite, al-titanate or zirconium on.

Fig.1

einen Querschnitt eines Schieberverschlusses einer teilweise dargestellten Druckgiesseinrichtung nach der Erfindung;

Fig.2

eine Draufsicht des Schieberverschlusses gemäss Fig.1;

Fig.3

einen Längsschnitt des Schieberverschlusses gemäss Fig.1;

Fig.4

einen teilweisen Querschnitt eines Schieberverschlusses, und

Fig.5

einen Längsschnitt einer weiteren Variante eines Schieberverschlusses.

Embodiments and other advantages of the invention are explained in more detail with reference to the drawing. It shows:

Fig.1

a cross section of a slide closure of a partially illustrated die casting device according to the invention;

Fig.2

a plan view of the slide closure according to Fig.1;

Figure 3

a longitudinal section of the slide closure according to Fig.1;

Figure 4

a partial cross section of a slide closure, and

Figure 5

a longitudinal section of another variant of a slide closure.

Figures 1 to 3 show a slide closure 20, the for opening and closing a passage opening 13, 14th serves. The slider closure 20 has an upper and a lower stationary closure part 21, 22 and an intermediate this movable slide plate 24, wherein this parts in contact with the melt from one refractory material are made.

Andeutungsweise is of a Druckgiesseinrichtung, which preferably for the rising pour one Alloy alloy is used, the upper end riser 11, 12 seen from a casting furnace through which the Melt up in a partially shown mold 15 is brought, this ever a through hole 13, 14th is provided, wherein between the riser 11, 12 and the mold 15, the slide closure 20 with the closure part 21 and the slide plate 24 is arranged.

The slide plate 24 is by means of spring organs 25 to the upper stationary closure member 21 or by other means to the lower closure member 22 pressed. The upper closure part 21 and the below this sliding slide plate 24 are of the spring organs 25 pressed together and assigned to the mold 15, Meanwhile, the lower closure member 22 the riser 11, 12 is assigned. The slide plate 24 is at Placing the mold 15 on the casting furnace close to the upper sliding surface 22 'of the closure part 22 is pressed, the means for this pressing by its own weight the mold 15 and / or by an additional not shown in more detail can be provided Verspannmittel. This bracing means may for example be a docking mechanism be by means of which the mold on the stove is positioned and tightened.

The lower closure part 22 has one to the top 16 'of the riser protruding collar 22 "on, the Such a height and width, that the spring organs 25 with rocker arms 26 engage under the slide plate 24 on both sides can. In principle, the slide plate could 24 on its underside a corresponding collar exhibit.

In a very advantageous embodiment of the invention is a fastened to the mold 15 or the like Housing frame 32 is provided in which a detachable Housing part 35 is fixed, on which the spring elements 25 held and the stationary closure part 21 and the slide plate 24 are receivable.

The housing frame 32 and the detachable housing part 35th have mutually corresponding guide surfaces on both sides 33, 34, wherein the one guide surface of the housing frame 32 so approximately in their longitudinal extent is slidably held, that the housing part 35 in it tensioned or can be solved by the same.

For this purpose, the guide surface 33 of the housing frame 32 protruding from a on a guide rod 36 Wedge 33 'formed. This guide rod 36 is in the housing frame 32 held longitudinally displaceable and can of outside the frame 32 in a housing part 35 spanning Item 36.2, as shown, or in a dissolved position 36.1 are pushed, in which the Housing part 35 of the frame 32 in particular for a Change of plates 21, 24 can be taken out, Meanwhile, the frame 32 on the mold or the like remains. The guide surfaces 33 of the wedge 33 'and the Housing part 35 are to the direction of displacement of the wedge 33 'arranged at an angle of several degrees, so that in position 36.2 a non-releasing wedge bracing arises.

On the opposite side are the guide surfaces 34 parallel to the direction of displacement of the guide rod 36 and viewed in cross-section, provided with a slope, so that the housing part 35 in the frame 32 quasi hangs and he can then move it of the wedge 33 'is fixed therein.

The riser has a refractory pouring tube 11 and a this holding metal tube 12 with an upper flange 12 ', which is mounted on a bellows 17. This advantageous made of a sheet metal bellows 17 is provided with such rigidity that with the lower Closure part 22 a limited floating storage is formed, so that a whole-area concern when Pressing the slide plate 24 against this closure member 22 and thus an optimal seal between the two is guaranteed. This is on the bottom Closure 22 also sealingly on a metal tube 12 held refractory casting tube 11, which with its lower end protrudes into the melt.

The spring members 25 have - as in Fig.2 it can be seen - on both sides of the plate 24 each one Rocker arm 26, each articulated on tabs 28 and from spring elements 29 on the plate 24 facing away Side is applied, such that the front Ends of the rocker arm 26, the slide plate up against push the closure member 21, which in a housing frame 32 is held. The housing frame 32 is in turn attached to the bottom of the mold 15. Further is still one with the slide plate frontally coupled Drive rod 33 indicated that not one listened closer shown drive member.

This pressure casting device is characterized by that the successively to be filled with melt molds easily and quickly positioned on the casting furnace, filled and replaced by a next mold can.

According to FIG. 3, the housing frame 32 is with its underside 32 'preferably on the side facing away from the drive member above the lower sliding surface 24 'of the slide plate 24 arranged. This allows the mold 15 together with the slide fastener attached to its underside 20 in the longitudinal direction of the slide plate 24 in the way that the collar 22 "of the belonging to the casting furnace closure member 22 between the Rocker arm 26 comes to rest and the mold 15 after Reaching the casting position on this closure part 22 can be lowered.

4 shows a variant of a pressure casting device, which in itself the same as that of Fig.1 constructed is therefore referred to the above explanations. The only difference is that the lower one stationary closure member 42 not the riser 41, but associated with the mold. Accordingly are the upper and lower closure members 21, 42 as well the slide plate 24 of rocker arms 46 of the spring members 45th braced against each other in the frame 32. This lower one Locking part 42 arrives when the casting mold is introduced the projecting collar 41 'of the riser 41 to lie. This offers the advantage that there is no shift between these two takes place and that between the slide plate 24 and the upper and the lower closure part 21, 42 a defined clamping force is present.

FIG. 5 shows a slide closure 50 which is in the Difference from that of Figure 1 not on the mold 65, but on the suggestively shown casting furnace 61 is attached. The simplified illustrated mold 65 is accordingly at the remaining on the mold Slide lock 50 attached and released again.

Conveniently, the slider closure 50 has a the casting furnace 61 mounted housing frame 52 in which a lower stationary refractory closure part 63 frontally of a clamping screw 66 or the like is fixed. The sliding above the closure part 63 arranged slide plate 54 is in a slide frame 56 held in turn by one of a drive member 69 adjustable slide 57 is taken. This Slider 57 is guided on slide rails 58, the top of Case frame 52 are attached. Between the slide plate 54 and the mold 65 as well as between the closure part 53 and the riser 62 are still seals 63, 64 provided.

According to the invention are between the mold 65 and the Casting 61 spring members 55 arranged in the present Sliders 57 are integrated and a tension of the Actuate slide plate 54 with the closure member 53. With This arrangement can be several hundred fillings of Run molds without the slide plate 54th or the wear part 53 would have to be replaced.

It is also hinted still the melt 68 during the filling process shown. As soon as the mold 65 is full, the same is the driven actuator 69th together with the slide plate 54 in the closed position pushed. A supply line 67 for a coolant above the slide plate 54 in a the mouth of the Mold 65 surrounding annular groove 67 'allows a accelerated cooling and thus rapid solidification the melt 68, leaving the mold from the slide closure 50 taken away and a new empty mold can be placed on the slide plate.

The slide plate 54 and the adjacent thereto Locking part 53, which form the closing surface are each provided with such passage openings 53 ', 54', that they are starting from the closing surface in diameter are extended upwards or downwards. This can be the in the passage opening 54 'of the slide plate 54th solidified melt when removing the mold 65 easily be taken out.

As a further contribution to the economy of the inventive Die casting device is a refractory Plate unit provided, which consists of at least one stätionären Closure part 21, 22, 42, 53 and a slide plate 24, 54 exists in which the following material combinations used in the production:

When the slide plate 24, 54 is used as the main component Graphite and at least one adjacent stationary one Closure part 21, 22, 42, 53 becomes a main component Graphite, Al titanate or zirconium used. Of course This can also be provided in the opposite sense be, i. for the closure part is graphite and for the Slide plate graphite, al-titanate or zirconium used.

The invention is with the embodiments explained above sufficiently demonstrated. The construction of the casting furnace with the riser can of course other than look like this. In principle, the riser could even an upper plane end face and thus the Make a closure part on which the slide plate would be slidably arranged.

Claims (12)

1. Sliding closure for casting molten metal for a die-casting apparatus, having at least one stationary closure part (21, 42, 53) which can be connected to a casting mould (15) or the like of the die-casting apparatus, and a sliding plate (24, 54) which is movable relative to the stationary closure part (21, 42, 53) and can be connected to a riser tube (11, 12, 62) of a casting furnace (61) belonging to the die-casting apparatus, the sliding plate (24, 54) and the at least one stationary closure part being tensed against one another by means of spring members (25, 45, 55) or other means, characterised in that, in the fully mounted state on the die-casting apparatus, the spring members (25, 45, 55) which are provided for tensing the at least one closure part (21, 42, 53) against the sliding plate are arranged on the sliding closure between the casting mould and the riser tube (11, 12, 62) of the casting furnace (61).
2. Sliding closure according to Claim 1, characterised in that a housing frame (32) able to be fastened to the casting mould (15) or the like is provided, in which housing frame (32) is fixed a detachable housing part (35) on which the spring members (25) are held and in which the stationary closure part (21) and the sliding plate (24) can be received.
3. Sliding closure according to Claim 2, characterised in that the housing frame (32) and the housing part (35) which is detachably held therein have at both ends guiding faces (33, 34) which correspond to one another, with one guiding face on the housing frame (32) being held to be displaceable approximately in its longitudinal direction in such a way that the housing part (35) can be tensed in the housing frame (32) or detached from it.
4. Sliding closure according to Claim 3, characterised in that the guiding face on the housing frame (32) is formed on a wedge (33') projecting from a mounting rod (36), the mounting rod (36) having the wedge (33') being longitudinally displaceable in the housing frame (32) to a position (36.2) in which the housing part (35) is tensed or to a position (36.1) in which the housing part (35) is released.
5. Sliding closure according to one of the foregoing claims, characterised in that the lower closure part (22) has a collar (22") which projects relative to the top face (16) of a casting furnace or the like, which collar (22") is of a height and width such that the tilting levers (26) of the spring members (25) are able to fit under the sliding plate (24) on both sides.
6. Sliding closure according to one of the foregoing claims, characterised in that, at the end remote from the actuating member of the sliding plate (24), the underside (32') of the housing frame (32) is preferably arranged above the lower sliding face (24') of the sliding plate (24).
7. Sliding closure according to one of the foregoing claims, characterised in that the upper and lower closure parts (21, 42) and also the sliding plate (24) are tensed against one another, in the housing frame (32) fastened to the casting mould (15), by the spring members (45).
8. Sliding closure according to Claim 1, characterised in that a housing frame (52) fastened to the casting furnace (61) or the like is provided, in which housing frame (52) is fixed a refractory lower stationary closure part (63), whereas the sliding plate (54) which is arranged to slide above the closure part (63) is held in a sliding frame (56) which in turn is entrained by a slider (57), the sliding plate (54) being tensed against the closure part (63) by spring members (55) which are built into the slider (57).
9. Sliding closure according to one of the foregoing claims, characterised in that a feed line (67), and an annular groove (67') for a coolant which is connected thereto and surrounds the opening at the mouth of the casting mould (65) or the like, are arranged above the sliding plate (54).
10. Sliding closure according to one of the foregoing claims, characterised in that the sliding plate (24, 54) and the at least one adjacent closure part (21, 22, 42, 53) have as a main constituent graphite, aluminium titanate or zirconium.
11. Sliding closure according to Claim 10, characterised in that the sliding plate (54) and the closure part (53) adjacent thereto, which form the closing face, are provided with respective openings (54', 53') for passage through which are such that, starting from the closing face, they become wider in diameter in the upward and downward directions respectively.
12. Sliding closure according to Claim 10 or 11, characterised in that the sliding plate (24, 54) has graphite as a main constituent and the at least one adjacent closure part (21, 22, 42, 53) has graphite, aluminium titanate or zirconium as a main constituent, or vice versa.

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