DE2116240A1 - Device for the treatment of cast iron blocks for shaping without stopping - Google Patents

Description

2T16240

Dipl.-Ing. Dipl. Oec. pubt 2. Λ: r i. 1 1 L ¹ 7 1

DIETRICH LEWfMSKY ess' /

PAiüNTANV / ALT
8 Munich 2T - Gctlhardstr. 81

Telephone 561762

Cas N Jean-Charles DAUSSAI, Gerard DAUSSAN and Andre DAUSSAlI

Device for the treatment of cast iron blocks for shaping without stopping.

The invention relates to the casting of metals in permanent molds or similar molds.

It is known to work on the inner surface of a

Mold in the upper part of the same or within the reinforcement of an attachment a heat-insulating and / or exothermic one To apply coating, which keeps the upper part of the casting bath liquid during its solidification so long that the Voids of the cast block are filled by the metal that has remained liquid in the upper part.

The German patent application P 20 25 736.7

from May 26, 1970 describes a heat insulating and / or exothermic Coating, which with a lower part without play ge ^ en the inner wall of the mold and / or its attachment

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along a close contact! "lay down, laugh over v / elcher there is a constriction which has at least one circumferential recess produced, soft on top with the outer rauia and through side openings with the space inside the cover in Connection. These openings allow the peripheral cavity is filled by the molten metal at the latest when the casting bath in the mold and / or its Essay has reached its highest level.

The molten metal that

has filled the catch cavity, quickly solidifies as a result of the contact with the inner wall of the mold and forms around the coating around a metallic belt, which holds the coating on the ingot when it is formed. V / ena nan it at the same time establishes that a 7orrichtung forming a cover forms on the surface of the cast block, the latter can be pulled out of the cast parts before its inner part solidifies and to the -S-i ^ furnace or any other. Body transported will. These processes can not only be carried out without any danger for the personnel responsible, but the good of the Gussblüokc is also improved by this.

However, the essential door parts of the above technique are accompanied by some disadvantages, in particular following:

- Bas of the filling of the circumferential hollow

corresponding metal is used with the corresponding amount of metal thrown away in the garbage and is thus lost.

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- The fact that the metal filling the Uinfanghohlraum is in contact with the cold inner wall of the mold on a fairly large surface, heat is lost. - The relatively sensitive condition of the coating requires certain precautionary measures in its manufacture and handling and causes a corresponding increase in the operating costs of the steelworks.

The aim of the invention is to eliminate these disadvantages to avoid.

The device according to the invention

Treatment of for immediate Ausforaiun / j after the filling of the molds, such as chill molds or chill caps, cast iron blocks, polygons by a heat changing and / or

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exothermic coating is formed, which before casting ~ «/: E: i the inner wall of the mold in the upper part of the same - is firmly connected to the cast block when it is molded remains' .mi has recesses, which on the one hand with the Outside and on the other hand with the space inside the cover aui "are related to a height which is lower as if left highest of the molten metal during the casting reached height is characterized in that the formed in the coating, to be filled with the metal during casting Recesses are limited by walls, some of which provide a support for the coating on the inner wall of the Form a shape over the entire height of the coating and at least over part of the circumference thereof.

This training has the consequence that the

Points of contact between the metal filling the recesses formed in the coating and the inner wall of the mold reduced or even completely eliminated, which results in a heat saving. This training also has a reduction in the volume of the recesses and thereby a metal saving and an operating cost reducing compact arrangement of the recesses result.

In an advantageous embodiment

According to the invention, the device has a first enclosure, which is provided with recesses, and on the periphery thereof at least at part of the height of the cover a second border is fixed, which over its entire extent is in contact with the inner wall of the mold. The first enclosure preferably consists of several touching one another Elements!: Which are arranged side by side and on which insulating panels of small thickness forming the second enclosure are attached, which leads to a particularly simple and economical production and application of the cover.

The invention is set out below with reference nair.o explained on the drawing by way of example.

Fig. 1 shows a first according to the invention Device in a vertical schematic section along the line I-I of FIG. 2, which with the formation of a shoulder

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between the left and right halves of the figure
the axis of the mold goes.

Pig. 2 is a horizontal cut lengthways the line II-II of FIG. 1.

FIGS. 3 and 4 show in one FIGS. 1 and 2

corresponding representation a modification of the
first device.

Fig. 5 shows a second according to the invention

Device in a vertical passing through the axis of the mold schematic section along the line V-V of FIG. 6.

Fig. 6 is a schematic plan view
the device of FIG. 5.

FIG. 7 shows, in a schematic perspective view with parts broken away, one of the
same device forming elements.

FIG. 8 shows, in a representation corresponding to FIG. 7, an element of a third according to the invention Contraption.

Figs. 9, 10 and 11 are views corresponding to Fig. 8 of three alternative embodiments of the same Contraption.

Figs. 1 and 2 show the application of the Er-.

Finding a mold 1 with a vertical axis AA, of which only the upper part is shown. The lower edge 2, the lifting eyes 3 and the inner wall A \ can be seen. In the embodiment shown, this inner wall is parallel to the axis
AA, but in general it forms one with this axis
Tapering angle facilitating shaping.

Before the casting, he becomes more familiar

One of four identical elements 12 in contact with one another
formed coating 11 against the inner wall 4 of the mold over
put a high H. These plate-shaped elements are in direct mutual contact with one another through their lateral edges 13. Each of them has recesses 16,
their horizontal cross-section in the example under consideration
rectangular and parallel to the wall, which is
Recesses over the entire height H of the cover 11 ″ extend so that they are on the one hand in the upper edge 14 of the plate 12 and

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on the other hand open into their lower edge 15, which for relief the rise of the metal in the mold is bevelled is. In addition, the recesses 16 stand through openings 18 with the space within the cover 11 in communication, which the molten metal M fills in during casting. These openings 18 must be at heights which are below the highest of the molten metal M reached during casting.

Except for the recesses 16 each has

Plate 12 other recesses 17, which the previous are similar, but with the difference that their height h is smaller than the height H of the coating and are, for example, τ- can. The recesses 17 are through openings 18 with the Space within the cover 11 in connection and open into the upper edge 14 of the plate 12, but not into its lower edge 15. The thickness of the coating between a recess 16 or 17 and the inner wall of the mold, or between two adjacent recesses, form these recesses delimiting walls.

In Pig. 2 bold, each plate 12 has two recesses 16 and a recess 17 located between them. Furthermore, the thickness of the plate 12 is between the recess and the surface in contact with the inner wall 4 of the mold is larger at the location of the recesses 17 than at the Location of the recesses 16. However, these details are not decisive and in no way limit the scope of the invention.

The coating 11 can have very different compositions. It usually contains temperature-resistant or fibrous substances, or substances that have these two properties at the same time, as well as binders that can be inorganic or organic, natural or artificial, such as sodium silicate, starchy substances, synthetic resins. For the sake of example only, two formulas are given below: Formula I : pebble-like sand (IfeLnheitindex 70) 90 to 95 # inorganic or organic binder 5 to 10 ^

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Formula II : temperature-resistant fibrous substances,

like aatbest or mineral wool $ 1 to $ 35

organic fibers such as sawdust

or paper pulp $ 1 to $ 20

inorganic temperature-resistant or semi-temperature-resistant substances, like silica, magnesia or

Infusorie soil 45 to 90 <&

inorganic or organic, natural or artificial

Binders $ 1 to $ 15>

The recesses 16, 17 and the openings

18 are mostly produced immediately during the formation of the coating. However, you can also choose one after the Forming of the coating carried out processing can be produced, at least if this one of the above formula II similar Composition has.

Unless specifically stated otherwise

is, the above information remains with regard to the composition of the coating 11 and the type of production of the recesses and the openings for the others described below Executions valid.

The recesses 16 and 17 have in the

a sense parallel to the walls of the coating is between 10 mm and 40 mm and preferably between 20 min and 25 mm Broad. Their dimensions perpendicular to these walls are between 5 mm and 10 mm. These dimensions are not necessarily from one end to the other of the recess evenly.

The operation of the above first embodiment of the invention will now be described.

Fulfilled after completion of the pouring process

the molten metal M lies within the coating Space up to the height N-N and spreads through the openings 18 in the recesses 16 and 17 from. It enters the recesses 16 also through her in the lower edge 15 of the cover opening lower end. The air and gases that are in the Recesses 16 and 17 are located, escape through the upper ones End of the same into the open.

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After filling the recesses 16 and

the seehaiol zene metal quickly solidifies in these, whereby it Forms rods which lie on at least part of the height H of the coating 11 within the same and with the circumference of the solidifying glass blocks remain connected. Experience shows the surprising result that a satisfactory joint can be obtained with thin rods spaced apart, so that the amount of metal taken up by these rods is very small. Furthermore, due to the small dimensions of the Rods and in particular due to the lack of contact between them and the inner wall 4 of the mold through the The heat losses caused by rods are extremely limited.

It is of course expedient to use the device according to the invention with the devices of the type described in the aforementioned patent application P 20 25 736.7 to combine a lid on the surface of the solidifying Form ingots. You can then form the cast block without stopping at the casting station, with the lateral coating and the lid of each port sling from within the block of molten metal.

When molding, the strength is the

Rods sufficient to keep the coating in contact with the head of the ingot, at least until it is inserted in the pits oven. Later, however, do the temperature changes to which the metal is exposed and its surface oxidation the bars more fragile, and under the action of the shocks, which the ingot during its transport to the rolling lines exposed, they break and release the coating. It is then found that there is no B-fragment of the same remains adhered to the ingot, at least in the lower one Section of the coating corresponding zone, and that the surface of the cast ingot that has been protected by the coating up to that point is practically smooth. You can therefore cut through at a point that is only affected by the state of the metal in the lower portion of the ingot is determined without being hampered by the presence of imperfections on the periphery thereof will.

Figs. 3 and 4 show an embodiment from Fig. 2 09 837/0570

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Conversion of the device shown in FIGS. 1 and 2. at This embodiment, the recesses 16 are on Perimeter of the plates 12 rather than in bulk. They open towards the inner wall of the mold. Arrangements are also possible which are between those in Pig. 1. And 2 on the one hand and in Pig. 3 and 4 on the other hand lie. In these intermediate arrangements, the recesses 16 open only on part of the height of the coating Towards the inner wall 4 of the mold.

In this variant, in

proceeded in the same way as described above with reference to FIGS. Which is caused by the solidification of the recesses However, 16 filling molten metal-forming rods are in contact with the inner wall 4 of the mold instead of to be separated from this by a certain thickness of the coating.

This has the consequence that the rods solidify faster than in the previous case, which is advantageous can be if the molding is to be made as quickly as possible, but the heat losses through the rods are somewhat greater.

Fig. 5, 6 and 7 show another invented

device according to the invention, in which the coating 21 consists of plate-shaped Main elements 22 consists, which form a first enclosure. These panels are on the side of the inner wall 4 of the form insulating panels 23 attached, which are full. These insulating panels, which have approximately the same outline as the plates 22 and practically the same thickness, form one second edging.

The plates 22 have recesses

approximately perpendicular incisions of unequal length 25, 26, which only open into the upper edge 24 of the coating. The lower ends of the long cuts 25 and the short cuts 26 are through inclined incisions 27 connected. The incisions 26 are connected to the space within the cover through openings 28 .

The insulating plates 23 form a part the recesses 25, 26 and 2? limit-

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the walls.

The composition of the insulating panels 24

is about the same as that given above for the elements forming the first enclosure. They are glued to these elements. Their thickness is preferably smaller than that of the plates 22 and can, for example, be between 5 mm and 8 mm.

From Fig. 5 and 6 it can be seen that the

Plates 22 do not touch one another, but are separated from one another by clamping wedges 29. These wedges have chimneys 31 » which open into their upper surface 30 and communicate with the space within the cover through openings 32, which, like the openings 28, are below the N-N level.

The cuts 25, 26 and 27 have one

preferably between 15 mm and 20 mm width and one preferably between 5 mm and 8 mm depth.

It is done in the same way as with the

first embodiment proceeded. The use of the insulation boards 23 for the formation of the surface of the coating which is in contact with the inner wall 4 of the mold, however, allows a considerable simplification of the processes for the production of the coating and facilitates the application of the same in the mold. It therefore results in considerable further savings.

The application of the coating is also accomplished through the use of the wedges separating the plates 22 29 relieved. The device shown in FIGS. 5 and 6 can, however, also be formed by plates in contact with one another become, like that shown in Figs. 1 and 2, without departing from the scope of the invention.

Fig. 8 shows a part of a third

The element 42 forming the device according to the invention Execution corresponding coating 41 consists, like that shown in Fig. 5 and 6, of four separated by clamping wedges identical plates 42 and four insulating plates, en 43 » which have the same outline as the plates 42 and are attached to them on the side of the inner wall of the mold. · Each Plat le 42 has a recess 46 which is in the side

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of the plate formed int on which the insulating plate 43 is attached. This recess 46 extends over the entire length of the plate 42 and about a TeU of its height between one upper contact strips 44 and a lower contact strip 45, both of which are in contact with the isolating element 43. The width _e_ der calculated perpendicular to the walls of the coating Recess 46 is preferably between 5 and 8 mm.

One with the recess 46 in connection

standing vertical incision 47 is in the lower abutment strip 45 worked out, but it extends only over part of the height of this strip and is not directly with the interior of the mold in connection. Two vertical chimneys 49 are in the upper contact strip 44 all over The same height and connect the recess with the outside space. Also connect in the plate 42 below of the level N-N formed openings 48 the recess 46 with the space lying within the cover 41.

Here, too, insulating panels 43 form part of the walls delimiting the recesses 46, 47 and 49.

The number of incisions 47, the openings

48 and the chimneys 49 in each panel 42 is not essential. The clamping wedges between the plates 42 can also be omitted without departing from the scope of the invention.

It is done in the same way as with the

proceeded as previously described. However, since the recesses 46 extend over the entire length of the plates 42, the amount of molten metal required to fill them is considerably greater.

At a first, in Pig. 9 shown

In a variant embodiment of the preceding device, the insulating panel 53 attached to the plate 52 has a lower height than this plate and ends at a distance d_ from the lower edge thereof. This distance can, for example, be -j the total height H of the cover. The plate 52 thus has on its surface facing the inner wall 4 of the mold from top to bottom an upper loading strip 54 for the insulating panel 53, a recess 56, a lower abutment strip 55 for aio insulating panel 53 and a strip 60 for tight contact with the Inner wall 4 of the mold.

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The strips 55 and 60 are with each other

connected by a shoulder 61, on which the unier edge of the panel 53 is supported, the outer surface of which is in alignment with the strip 60 j places.

The plate 52 has incisions 57, openings 5ü and 59 which are arranged like the homologous elements of the plates 42. The bottom of the incisions 57 is, however, at a distance d_ ^f from the lower edge of the plate 52, which is smaller than the distance d_, so that the section of the incisions 57 located below the lower edge of the insulating panel 53 on the circumference of the coating in the direction of the Inner wall 4 of the mold opens.

In a second shown in FIG

Embodiment modification of the third device extends the insulating panel 43 over the entire height of the plate 42 as in FIG. 8. The incision 47, however, extends over the whole High de3 lower contact strip 45, opens into the lower edge the plate 42 and is directly connected to the interior of the mold.

Finally there is a third one, in Pig. 11

The illustrated embodiment modification from that illustrated in FIG. 9 first variant embodiment derived in the same way as the second variant embodiment derived from the original Device, i.e., incisions 57 extend. over the entire height of the sealing contact strip 60.

For those shown in Figs

Variations in design should be noted that the melted Metal M into the recesses 46 and 56 not only through the openings 48 and 58, which connect them to the space within the cover, but also through the incisions 47 and 57, as these open into the lower edge of the plates 42 or 52.

From the above it follows that

that in their principle simple and easy to implement changes the previously known devices eliminate the disadvantages of the same to a considerable extent and they are much more economical do.

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The invention thus has an undoubted technical result and significant economic results.

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Claims (10)

Claims 1.) Device for the treatment of for immediate shaping after filling the molds, such as molds or mold attachments, certain cast iron blocks, which by a heat-insulating and / or exothermic coating formed \ tfird, v / elcher before casting against the Inner wall of the mold is placed in the upper part of the same, remains firmly connected to the cast block during molding and Has recesses which, on the one hand, with the outside space and, on the other hand, with the space within the cover connected to a high, lower than the highest of the molten metal during casting, characterized in that the in the coating (11, 21, 41) formed recesses (16, 17, 25, 26, 27, 46, 47, 49, 56, 57, 59) to be filled with the metal (M) during casting Walls are limited, which partly a support for the coating on the inner wall (4) of the mold (1) over the entire height of the coating and at least on part of the circumference thereof. 2.) Device according to claim 1, characterized characterized in that the recesses (16) over the whole Extend the height of the coating (11). 3.) Device according to claim 1, characterized characterized in that the recesses (17, 25, 26, 27, 46, 47, 49, 56, 57, 59) only cover part of the height of the coating (11, 21, 41) extend. 4 ·) Device according to claim 1, characterized characterized in that the recesses (16, 57) at least part of the height of the coating (11) on the circumference of the same in Open towards the inner wall (4) of the mold (1). 5 ») Device according to claim 1, characterized characterized in that the cover (21, 41) has a first enclosure (22, 42, 52) which is provided with recesses (25, 26, 27, 46, 47, 49, 57, 59) is provided, and on the circumference at least on part of the height of the cover a second border (23, 43, 53) is attached, which is in contact over its entire extent with the inner wall (4) of the mold (1). 209837/0570 6.) Device according to claim 5, characterized characterized in that the second skirt (23, 43, 53) has a smaller thickness than the first skirt (22, 42, 52). 7.) Device according to claim 5, characterized characterized in that the second enclosure (23, 43, 53) consists of consists of a heat-insulating and / or exothermic substance, which has approximately the same composition as that forming the first enclosure (22, 42, 52). 8.) Device according to claim 5, characterized characterized in that the second enclosure (23, 43, 53) is adhered to the first enclosure (22, 42, 52). 9.) Device according to claim 5, characterized characterized in that the first enclosure (22, 42, 52) consists of a plurality of elements arranged next to one another and in contact with one another, in which recesses (25, 26, 27, 46, 47, 49, 57, 59) are formed, at least on a part of which the second enclosure (23, 43, 53) forming insulating panels less Thickness are attached on the side on which the cover (21, 41) with the inner wall (4) of the mold (1) in contact stands. 10.) Device according to claim 9, characterized characterized in that at least one of the contacting elements forming the first enclosure (52) has a thickening at the bottom (60) which comes into contact with the mold (1) and at its upper edge (61) a support for the Certain lower edge of the insulating panels (53) 209837/0570