DE102009036699A1 - Refractory block fitted over edge of casting ladle in pouring zone, presents rounded edge and converging side walls to flowing molten metal - Google Patents

Abstract

At the pouring zone (4), the block has a rounded edge surface (6) which extends in the direction of casting. The edge-rounding curves smoothly between the inner and outer walls (17, 18) of the block. The surface (6) is cylindrical, oval or elliptical. Its cross section is circular-, especially semicircular-cylindrical. The casting surface lies opposite a flat lower wall (7). This (7) seats on an edge of the casting opening in the ladle. It is wider than the edge thickness (3) of the opening. A support section (9) projects from the lower wall (7) and reaches down behind the wall of the ladle. It seats on an upper edge of the permanent refractory lining of the ladle. The support section is either thicker or thinner than the lining. In a development of the design, opposite the support section, a shorter protection section is located. This leaves a groove between these two sections. The groove fits over the free edge-region of the casting opening in the ladle. The pouring zone (4) is designed as a weir with shoulders (5). The side wall of each shoulder is not radial, but is angled, convex or concave, such that the pouring zone narrows in the direction of casting.

Description

The The invention relates to a frying pan of one commonly used refractory material for a refractory ladle lining open top metallurgical pan for casting molten metal.

The pans with ladle curbs for pouring of molten metal usually have a round pouring opening and a Pfannenaußenwandung of metal, on whose Inner surface in layers a fireproof permanent lining material and on the inside of the pan, a refractory wear lining material are applied. The metal pan rim is with pan rim stones covered. About the curb-equipped Pfannenrand is the slag and / or molten metal by tilting the pan poured out. These are subject to the melt flow Pfannenrandsteinbereiche particularly high thermochemical and mechanical Strains resulting in erosion and corrosion. moreover High temperature changes occur, leading to stress cracks and flaking to lead. On top of that, on the melt during casting acted surface of the spout area the curbs, especially at the curb edges of the spout area, Melting material attaches when tilting back the pan and There it solidifies, so that the outflow of the melt when tipping again and the outflow of melt back into the pan when Being tipped back.

Is known from the EP 770 440 B1 a pan edge stone with a spout area, which is overflowed during the pouring of melt. On the curb an inner leg is formed, whose cross-sectional thickness corresponds approximately to the cross-sectional thickness of the permanent lining of the pan, whereby a part of the permanent lining is replaced by the inner leg. In addition, the curb in the spout area on a rounded pouring edge and / or a rounded drip edge.

Of the inner leg should be aligned with the permanent lining inside the cup. This arrangement has the disadvantage that melt in the gap between working lining and permanent feed penetrate and in this area the refractory material can harm.

One The main disadvantage of the known pan rim is that he has a pouring and / or drip edge, which coincide or spaced from each other. Even though The edges should be rounded, are the thermal and mechanical Effects of the melt and the influence of temperature changes these edges in such a way that still high wear, especially by erosion and corrosion, as well as not insignificant Cracking and flaking occur, leaving the pan curbs too often need to be replaced.

The same applies to the older refractory ladle edge training according to JP 70 400 35 A , which also has a rounded pouring and a rounded drip edge.

task The invention is a pan rim made of refractory material to create whose surface space shape is formed is that it has a low resistance to flow and a buildup in the form of settling residual melt material counteracts when tilting back the pan or at least largely prevented.

These The object is solved by the features of claim 1. Advantageous embodiments of the invention are disclosed in characterized the dependent claims.

The The invention thus provides for the spout area of a pan edge brick Casting in the casting direction and drip edges free design. This ensures that the spout area of the pan rim stone remains largely rudimentary, which even with rounded edges can not be achieved according to the prior art. The casting and drip edge freedom is achieved by the surface of the Spout area in transverse extension of the pan edge stone or in Casting a curved, in particular cylindrical or forms a bead-shaped surface, wherein the resulting arc shape of the surface for example elliptical or circular arc, in particular semi-circular arc is. It is preferably the culmination or the zenith the cylinder or bow shape expediently in the transverse center area of the spout area. Result from this spatial form When tilting back the pan opposite drainage surfaces for the melt in each Rückkippstellung the Pan are directed downwards, allowing the melt to tilt back the pan unhindered both back due to gravity drain freely into the pan as well as to the outside can. The cylindrical or arcuate surface is also less prone to flaking and cracks in the temperature changes that occur during casting and occur after casting. In addition, a guaranteed such surface has a lower resistance to flow for the melt.

Due to this spatial form, the melt always flows on tilting for pouring and tilting back on a sloping surface on the drop formation or residual melt adhesion is at least greatly reduced compared to rounded pouring and / or drip edges. Unless in the over Transition area between the casting surface and the broad side wall surfaces of the pan edge stone edges are formed, these are not rounded, but sharp or angular.

To a particular embodiment of the invention is the Arc shape or rounding of the pouring edge on the tilt angle range matched the pan, allowing the melt to pour does not hit an edge in the bow area.

Based the drawing, the invention is exemplified in more detail below explained. Show it:

1 a cross-section through a perspective view of a half of a pan rim of the invention in the peripheral installation area of a metallurgical pan;

2 perspective view of another embodiment of a pan edge stone in the form of a slag edge stone;

3 a plan view of the spout side of a pan rim stone according to the invention in the form of a so-called tilting beak.

An inventive pan edge stone 1 has in its longitudinal extension of the rounding of the upper opening of a pan (not shown) adapted, curved spatial form, in particular from 3 is recognizable.

The pan edge stone according to the invention 1 sits like in 1 shown on a curved Gießöffnungsoberkante 3 a metal ladle wall 2 , He has two side walls 17 . 18 and a spout area merging into the two side walls 4 on, that of two lateral boundary webs 5 is laterally limited and in the longitudinal extension with respect to the Begrenzungsstege 5 deeper casting surface 6 has - viewed in cross section - semi-circular cylindrical and extends the semi-circular cylindrical space shape over the entire thickness "D" of the pan edge stone. The height "H" of the pan rim is slightly larger than the thickness "D". The length "L" ( 3 ) is about 5 to 8 times the thickness "D" and is z. B. 2000 mm. The weight of a pan edge stone is z. B. 450 kg. This room shape results in a defensive spout area 4 , wherein the casting surface 6 edgeless in the side walls 17 . 18 passes or the side walls are arranged tangentially to the casting surface. If the arc shape of the casting surface 6 is not semicircular arc, there are edges at the transition between the casting surface 6 and the side walls 17 . 18 that are relatively sharp-edged. It has been shown that this angularity is harmless and does not cause dripping.

The pan edge stone according to the invention 1 has one of the casting surface 6 opposite sub-wall 7 on, with the stone on the top edge 3 the Pfannenwandung 2 seated. The under wall 7 is wider in the transverse direction of the stone than the upper edge 3 the pan, leaving the pan edge stone 1 the wall 2 the pan overhangs the outside.

The inner side of the pan extends from the lower wall 7 vertically downwards a narrower outrigger 9 Standing on a free top surface of a permanent food 8th the ladle lining 10 can support. Against the permanent food 8th is usually a working food 11 set that also the support bar 9 covered and approximately up to the height of the lower wall 7 of frying pan 1 enough ( 1 ). It is advantageous that the permanent feed 8th thicker than the support bar 9 , This ensures that between the Abstützsteg 9 and the working food 11 no down-going gap 13 arises, but a step 12 is formed, which is the gap 13 interrupts and in the manner of a labyrinth seal prevents in the gap 13 above the level 12 penetrating melt into the gap 13 between the permanent feed 8th and the working food 11 flows. It is within the scope of the invention, the Abstützsteg 9 thicker than the permanent food 8th form, which also results in a stage that as the stage 12 can work.

In the embodiment of the pan rim stone according to the invention 1 to 2 is a support bar 9 at a distance in the transverse direction opposite, preferably downwards slightly shorter, the wall 2 the pan on the outside cross guard rail 14 provided, wherein in the resulting from this spatial shape groove 15 between the two bridges 9 and 14 the upper edge of the Pfannenwandung 2 and thereby protected against temperature and melt flow effects. The in 2 pictured pan rim is a slag rim without sidewall bars 5 , Of course, the in 1 pictured pan rim 1 with a comprehensive guardrail 14 be educated.

From the top view in 3 It can be seen that the spout area surfaces of the boundary webs 5 as Gießbegrenzungswandungen 16 preferably not radially with respect to the curvature of the pan edge stone 1 are aligned, but such that they the spill area 4 in the pouring direction 19 tapering from the inside to the outside.

With the invention, it has been possible to avoid the disadvantages of edges, in particular rounded edges in the spout area and to create pan edge stones, due to their space in the spout area are considerably more resistant to wear.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 770440 B1 [0003]
• - JP 7040035 A [0006]

Claims (9)

Pan edge stone ( 1 ) of a refractory, mineral material for lining the edge of a round pouring opening of a top open, metallurgical, tiltable, inside with a refractory lining and optionally a refractory lining lined ladle for casting molten metal, wherein the pan edge stone in its longitudinal extent one of the curvature of the pouring opening adapted curvature and a spout area ( 4 ), which is overflowed during the pouring of molten material flowing out of the ladle, characterized in that the spout area (FIG. 4 ) a curved casting surface extending in the casting direction ( 6 ), which covers the entire transverse extent of the pan rim stone from one of its two side walls (FIG. 17 . 18 ) spans to the other. Cup rim stone according to claim 1, characterized in that the casting surface ( 6 ) is cylindrical, oval or elliptical. Cup rim stone according to claim 2, characterized in that the casting surface ( 6 ) is circular cylindrical, in particular semicircular cylindrical. Cup rim stone according to one or more of claims 1 to 3, characterized in that the casting surface ( 6 ) opposite a plane sub-wall ( 7 ) is provided for seating on a Gießöffnungskante the ladle, which is wider than the edge of the pouring opening. Cup rim stone according to claim 4, characterized in that on the lower wall ( 7 ) a vertically outgoing support web ( 9 ) is arranged for the inside engaging behind the Gießpfannenwandung and sitting on an upper edge of the permanent lining of the ladle. Cup rim stone according to claim 5, characterized in that the thickness of the Abstützsteges ( 9 ) is tuned to the thickness of the permanent lining such that it is either thicker or thinner. Cup rim stone according to one or more of claims 4 to 6, characterized in that the casting surface ( 6 ) opposite to the under wall ( 7 ) a the support web ( 9 ) on distance opposite, preferably slightly shorter guard bar ( 14 ) is arranged so that a groove ( 15 ) between the bridges ( 9 ) and ( 14 ) is formed for receiving a free edge region of the pouring opening of the ladle. Cup rim stone according to one or more of claims 1 to 7, characterized in that the spout area ( 4 ) is formed Wehrartig and the casting surface ( 6 ) laterally by a respective limiting web ( 5 ), and the boundary webs ( 5 ) each one of the casting surface ( 6 ) facing lateral Gießbegrenzungswandung ( 16 ) exhibit. Cup rim stone according to claim 8, characterized in that the Gießbegrenzungswandungen ( 16 ) with respect to the radius of curvature of the pan edge stone ( 1 ) are not aligned radially, but are oriented obliquely, convexly or concavely, that the spout area ( 4 ) in the pouring direction ( 19 ) narrowed.

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